Supporting mechanism for magnetic tape recorder

Supporting mechanism for magnetic tape recorder
United States Patent [191
[111
4,127,883
Mestdagh
[45]
Nov. 28, 1978
[54] SUPPORTING MECHANISM FOR
[56]
MAGNETIC TAPE RECORDER
[75] Inventor:
- References Cited
U.S. PATENT DOCUMENTS
Gilbert E. Mestdagh, Eindhoven,
Netherlands
[73] Assignee: U.S. Philips Corporation, New York,
N.Y.
3
7/ 1973
van der Lely
3 843,847 10/1974
Sato
3 864,745
3 893,186
Platt
Yoshii
2/1975
7/1975
Primary
3 996,618
Examiner—John
12/1976 Suzuki
H. Wolff
Attorney, Agent, or Firm-Frank R. Trifari; David R.
Treacy .
[21] Appl. No.: 805,965
[57]
[22] Filed:
[30]
A tape recording and/or playback apparatus having a
Jun. 13, 1977
cassette support positioned vertically by the magnetic
head holder. The support is movable with the magnetic
Foreign Application Priority Data
Jun. 21, 1976 [NL]
ABSTRACT
Netherlands
7606690
head unit in two transverse directions, one in which the
heads are inserted in or retracted from the operative
position, and the other in which the holder may be
[s2] Field
[58]
U.S.Cl.
of Search
G11B 5/54
3w/ m5; 360/96
360/95, 93 , 96, 69,
360/105, 132
latched or unlatched so as to permit the support and
magnetic head unit to move into the operating position.
16 Claims, 5 Drawing Figures
U.S. Patent
Nov. 28, 1978
Sheet 1 of5
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Nov. 28, 1978
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34
62
U.S. Patent \Nov. 28, 1978
Sheet 3 of 5
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US. Patent
Nov. 28, 1978
Sheet 4 of 5
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U.S. Patent
Nov. 28, 1978
Sheet 5 of 5
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1
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2
known tape deck mechanisms have made extensive use
SUPPORTING MECHANISM FOR MAGNETIC
TAPE RECORDER
of metal components, such as a metal base plate and a
metal head holder. Because of weight and cost consid
erations, portable cassette recorders almost always use a
plastic housing; more recently, in order to reduce cost
tape deck mechanisms making considerable use of plas
tic materials and parts have been introduced, and some
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a cassette handling apparatus
for recording and/or playback of signals on magnetic
units have been proposed which would even use a plas
tape contained in a cassette (hereinafter referred to
simply as a cassette recorder); and more particular to a
cassette recorder having a magnetic head unit which is
movable with respect to the housing between an operat
tic head holder. However, in general this construction
has involved the replacement of metal parts by plastic
parts, so that in effect the conventional metal deck
mechanisms have been “translated” into plastic (for
ing position and a retracted position, the latter allowing
example, British patent specification No. 1,401,740).
The known plastic mechanisms have used plastics of
insertion or removal of a cassette; and a cassette support
good availability and low price, which plastics unfortu
adapted to position the cassette in a direction transverse
to the direction of tape transport past the head, in the
plane of the tape.
The most widely used type of magnetic tape cassette
for quality reproduction has two hubs placed side-by
side with the magnetic tape wound around and passing
between them. One particular design of cassette of this
nately have a lower strength, a much lower modulus of
elasticity, a greater temperature dependence of the
modulus of elasticity, and much lower dimensional
stability than the metal parts that are replaced. Success
20 ful production of a good quality recorder with plastic
parts in place of metal has required comparatively ex
general type has come into predominant use for enter
tainment purposes, and is also used in some dictation
pensive, stable plastics, which could only be processed
by those manufacturers having great experience in the
?eld of plastics.
applications. This cassette, which is depicted for exam
ple in U.S. Pat. No. 3,396,899 is commonly called the 25 Although it has been recognized that in the use of a
“Compact Cassette.” Although it can be manufactured
plastic deck mechanism, accurate relative positioning of
relatively inexpensively, it has a fairly rigid housing
the magnetic heads, capstan and pressure roller is re
structure which permits good alignment of the tape
quired for accurate transport of the comparatively nar
with regard to the outer surfaces of the ?at housing in
row magnetic tape, achieving this goal using part de
which the tape and two hubs are contained. The tape
passes an opening in a long or front wall of the housing,
signs which are the same as that of the previous metal
parts has made it difficult to provide a recorder whose
through which opening the magnetic heads are inserted
reproduced sound meets reasonable quality standards
with a high reliability of long operating life. Moreover,
inability to guide the tape accurately can damage the
to engage the tape and a pressure roller is inserted to
press the tape against a capstan that extends up through
a hole in the bottom wall of the cassette. Drive spindles 35 tape in the cassette, and in some cases may even render
for the two hubs also project up through openings in the
the tape cassette completely useless.
bottom wall of the cassette. Thus in order to locate the
cassette on a playing apparatus, there must be motion
volved around the convenience of handling. Particu
Another facet of cassette recorder design has re
with respect to operational parts of the apparatus in two
larly suited for use in automobiles, cassette recorders
directions, ?rst to pass the spindles and capstan through 40 such as that described in U.S. Pat. No. 3,747,941 do not
their openings into position, and then transversely so
require manual actuation of a “ lay” button in order to
that the heads and pressure roller may engage the tape.
move the magnetic head unit into the operating position
Tape cassettes for audio entertainment use were orig
and to energize the transport drive motor and the elec
inally intended for low priced magnetic tape equipment,
tronic circuitry. This has been particularly advanta
whose performance was less than that of the so-called 45 geous where operation should demand a minimum of
reel-to-reel recorders. However, because the separate
magnetic tape reels of the reel-to-reel machines could
not be placed on the apparatus in a single motion, the
development of the magnetic tape cassette was intended
to make magnetic tape equipment more popular and
available at a lower price. Moreover, because of the
suitability of the cassette recorders for portable use,
more early cassette recorders had inexpensive elec
tronic components and circuits and small loudspeakers
that could not provide audio performance equivalent to 55
the higher rated equipment. Although recently cassette
attention from the user, for example the automobile
driver. In such a recorder a spring or other device will
bias the head holder towards its operating position; and
an actuating means is provided for manually moving the
head holder against the action of the previously men
tioned spring from the operating to a more retracted
position, in which a locking means will lock the head
holder so retracted. The locking means and unlocking
means utilize a second spring or resilient device and a
movable unlocking member biased by the second
spring, the unlocking member being affected by the
recorders are now produced for the higher price and
exertion of manual pressure on the cassette.
performance ranges, and maintain the desirable conve
In a previously known cassette recorder of this gen
nience of handling and in some cases may comply with
eral type, the locking means utilizes a small pin which
hi-? standards, as a product the small portable cassette 60 projects upward through the base of the apparatus.
recorder is still eminently suited for the lower price
After placing the cassette on the apparatus, pressure is
range in which the cost of materials and assembly time
exerted on the front of the cassette, that is, the edge near
become very important.
2. Description of the Prior Art
the magnetic beads, and the head holder is released
from its locked position and is moved to the operating
In order to position the compact cassette or similar 65 position by the ?rst spring. To turn off the equipment,
cassettes sufficiently accurately in a tape apparatus, so
that the head will have proper engagement with the
narrow track of information recorded along the tape,
manual pressure on two interlocked push buttons dis
posed one to each side of the apparatus is required, so
that the head holder is returned to its more retracted
3
4,127,883
4
surfaces and stop surfaces being formed by molding so
that accurate relative positioning may be maintained
without the need for extreme stability in the housing
material. This advantage follows from the fact that the
injection molds are normally manufactured with high
position and at the same time the pin moves upward
thereby pushing the cassette up.
SUMMARY OF THE INVENTION
An object of the invention is to provide a cassette
recorder which will assure correct positioning of the
magnetic tape, in particular relative to a playback head
precision. In the preferred construction, the housing
section includes a cassette compartment whose bottom
(as used hereinafter, this term is intended to include a
wall has supporting surfaces and stationary holder stops
head used for recording only, or for both recording and
molded on opposite sides of the bottom wall.
According to a still further preferred embodiment of
playback), having a deck mechanism which may suc
cessfully be made substantially all from plastic molded
the invention, at least one movable cassette support also
functions as an unlocking member to permit the head
holder to move from the retracted to the operating
parts. A further object of the invention is to provide a
simple, reliable mechanism for moving a magnetic head
unit from a locked position to an operating position and
for moving the magnetic head unit back to the locked
position and releasing the cassette in response to a sim
ple manual movement, without need for additional
position without further manipulation by a person who
has loaded the cassette into the recorder. The complete
head holder while in its retracted position is movable
from an unlocked position to a locked or rest position
moving parts or precise components.
against a spring force; and a second spring biases the
head holder from the retracted position toward the
According to the invention a tape cassette recorder
has a magnetic head unit which is movable with respect 20 operating position. Advantageously, these two motions
to an inserted cassette’s location both in a ?rst direction
are provided as pivoting motions about one pivot bear
between retracted and operating positions so arranged
ing arrangement which permits small angular move
that, when the unit is in a retracted position, the cassette
ments about two axes perpendicular to each other. This
may readily be removed from or loaded into the appara
provides the cost and manufacturing advantage that
tus, and in a second direction transverse to the ?rst 25 such a bearing may be an apparently poor quality bear
direction for latching the unit or for sensing the inser
ing having considerable play. Particularly with appara
tion of a cassette so as to unlatch and permit the head
tus designed for use in automobiles, by having a cassette
unit automatically to move into the engaged position;
support perform a double function, providing a separate
actuating member for switching on the recorder may be
tion, when the magnetic head unit is in operating posi 30 eliminated, and “one hand” insertion and turn-on can be
and a movable cassette supporting means whose posi
tion for engaging tape, is determined directly by the
magnetic head unit.
This inventive construction provides the advantage
provided while still obtaining accurate positioning of
the cassette in a low cost apparatus.
BRIEF DESCRIPTION OF THE DRAWING
that the position of a cassette placed on the apparatus is,
during operation, directly related to the position of the
35
magnetic head unit, so that it is no longer necessary that
the magnetic head unit be accurately guided relative to
other parts of the apparatus such as a base plate or a
The invention will now be described in more detail
with reference to the drawing, in which:
FIG. 1 is a perspective view of a small portable cas
sette recorder in accordance with the invention, and its
housing. This permits the use of relatively less stable
associated cassette,
plastic materials for the housing parts and the magnetic 40 FIG. 2 is an exploded perspective view, from under
head holder; or in the event of the use of metal, elimi
neath, of the upper section of the housing of the em
nates the need for precision guides such as steel balls for
bodiment of FIG. 1,
positioning the head holder with respect to the housing.
FIG. 3 is an exploded perspective view as in FIG. 2
According to a preferred embodiment of the inven
but showing the recording-switching member in the
tion, in order to avoid subjecting the magnetic record 45 recording position,
ing or playback head to a mechanical load, the movable
FIG. 4 is a view similar to FIG. 2 but with certain
cassette supporting means comprises a movable cassette
parts
omitted, and
support whose position is determined by the position of
FIG. 5 is a perspective view of the magnetic head
the head holder itself. Preferably, the movable cassette
unit of the embodiment of FIG. 1.
supporting means is rigidly connected to the head 50
DESCRIPTION OF THE PREFERRED
EMBODIMENT
holder, and is most advantageously formed as an inte
gral portion of that holder arranged in the immediate
vicinity of the playback head. Two additional cassette
supports are stationary and are located on a base plate of
the tape deck mechanism or a housing of the recorder 55
apparatus, so that during operation the cassette is posi
tioned in a vertical direction by three points — one
being close to and responsive to the position of the
recording and/or playback head.
In a further preferred embodiment of the invention in
the operating position the magnetic head unit holder is
positioned against stationary stops so that accurate posi
tioning of the head unit can be obtained without the
need for accurate guiding of the head unit when it is not
in the operating position. Advantageously, the station
ary cassette supporting means and the stationary stops
for the head holder are formed integrally as part of one
housing section of the apparatus, respective supporting
Cassette and Magnetic Head Positioning
A cassette recorder according to the preferred em
bodiment shown generally in FIG. 1 has a housing
formed from upper and lower housing sections 1 and 2
each integrally formed from a molded plastic. Mounted
movable in this housing is a magnetic head unit 3,
shown in detail in FIG. 5, having a magnetic head 4 for
recording and playback and an erase head 5 for erasing,
mounted on a molded plastic holder 6, only the two
magnetic heads being visible in FIG. 1. The holder 6
and the magnetic heads are arranged to be movable
65 from a retracted position shown in FIG. 1 into an oper
ating position in which the heads can magnetically en
gage magnetic tape in a cassette 7. When the holder 6 is
in the retracted position the cassette can be placed
5
4,127,883
on/or removed from the recorder without interference
by the heads 4, 5.
6
To bias the holder 6 upward (toward the locking
position), a leaf-spring 23 is pressed into and extends
Also visible in FIG. 1 is a cassette support 8, formed
forwardly from a boss 24 on the rear wall 201, and
as a rigid part of the head holder 6. Preferably, this
presses upwardly against a roller 30 which is ?tted
support is located in the immediate vicinity of the recor 5 rotatively into a groove in the bottom surface of the
latch arm 28. Alternatively, of course, the roller could
ding/reproducing head 4. During operation the cassette
also be mounted at the end of the leaf-spring, and roll
7 is positioned vertically by bearing on the movable
along the undersurface of the arm 28, depending on the
cassette support 8 and on two stationary cassette sup
optimum choice of design details.
ports 9 formed as a part of the upper assembly 1. The
The vertical positioning of the holder 6 is established
position of the cassette 7 relative to the magnetic heads
by the cooperation of a number of different surfaces.
4, 5 during operation is therefore at least partly deter
When the holder is in the locked position, a cam surface
mined by the position of the unit 3.
29, disposed on the arm 28 at a slightly different level
In FIGS. 2 and 3 the magnetic head unit 3 is shown in
from the end 21, is pressed against a horizontal surface
its operating position. The head holder is continually
biased toward its operating position by a spring 11 lo 15 33 of the upper housing section 1 extending forwardly
from the edge 22. The force exerted by the leaf-spring
cated above the holder 6 and therefore hidden from
23 biases the holder 6 toward the surface 33 described
view in FIGS. 2 and 3, the spring being visible in FIG.
above, and toward the raised surfaces 34 and 35 of two
4. One end of the spring 11 bears against a rear wall 201
bosses molded into the bottom surface of the upper
of the upper housing section 1, and the other end against
the rear of a pressure roller lever 12. As shown in FIG. 20 housing section 1. Surface 34 engages the lever arm 32
5, the roller lever 12 has a pressure roller 13 rotatably
mounted in the lever which in turn is connected to the
head holder 6 by an integral hinge 14 having a thick
ened end 15 pressed into an upwardly extending projec
tion 16 of the head holder 6. Opposite the end 15 a tab 25
17 extends from the lever 12 and abuts a pin 18 on the
head holder 6 when the roller is not actually engaging
near the button end 19, and surface 35 is near the pin 25.
This use of three widely separated surfaces provides
unambiguous positioning of the holder 6, and therefore
of the magnetic head unit 3. During movement between
the operating position and the unlocked, retracted posi
tion the upper surface of the end 21 of the arm 28 slides
along the surface 33, until the end 21 slides past the edge
22 and is pressed upward to the point where the cam 29
tape in a cassette. The force of the pressure spring 11 is
therefore transmitted to the head holder through this 30 engages the surface 33, again providing unambiguous
three-point positioning.
pin. Preferably, the pressure roller lever and its end and
As shown in FIG. 1 the upper housing section 1 has
tab, as well as hearing support for the roller 13, are all
a cassette compartment 36 having a bottom 37 through
a unitary plastic molding. As shown most clearly in
which a slot 38 is formed, the movable cassette support
FIG. 5, the holder 6 is formed generally as an L-shaped
8 projecting through the slot to provide localized sup
lever having an arm 31 on which the magnetic heads 4, 35
port to the cassette adjacent the recording/playback
5 are mounted and an arm 32 at whose end a push but
ton 19 is located. For moving the head holder manually
from its operating position to the retracted position, the
push button 19 extends through and is movable in an
opening 20 formed in an end wall of the lower housing 40
head. The surfaces 33-35, which position the head
holder 6, and the stationary cassette supports 9 being on
opposite sides of the bottom wall 37 of the compartment
36, stable relative positioning of the cassette and the
magnetic head unit 3 is assured.
The recorder shown in FIG. 1 is particularly adapted
for playing a Compact Cassette 7 which is shown above
and parallel to the position is occupies in the recorder,
section 2.
To permit the magnetic head unit 3 to be locked in
the more retracted position, as shown in FIG. 1, the
head holder 6 includes a latch arm 28 extending for
what is normally considered the rear of the cassette
wardly from a location adjacent the erase head 5 on the 45 being toward the front of the recorder. The long front
arm 31, and having an end 21 arranged to latch against
wall of the cassette, not shown in this view and opposite
an edge 22 of the upper housing section 1 which extends
the knock-out tabs 92 which are removed to identify
downwardly from a horizontal lower surface 223 of the
pre-recorded tape, has a set of openings to expose tape
section 1. The operation of this latch will be discussed
running along that front wall for engagement by a pres
more fully below. For consistency, in this description 50 sure roller and by magnetic heads. These cassettes have
“downward” refers to the orientation of FIGS. 1 and 5;
symmetrical raised portions 190 on the top and bottom
therefore “downward” movement of elements shown in
surfaces, in which are symmetrically arranged openings
FIGS. 2-4 appears upward in these bottom views.
94 through which a drive capstan, to be described later,
Unlocking from the rest position is accomplished by
may be passed, and openings 95 for positioning the
pivoting the head holder 6 downward, in a second di 55 cassette housing in the sideways and front-to-back di
rection transverse to its principal movement between
rection.
the retracted and operating position. To permit these
A depressed area 191 in the bottom 37 of the com
two motions to be properly de?ned, the upper housing
partment 36 receives the raised portion 190 on the bot
1 includes an integrally molded bearing pin 25 extend
tom of the cassette 7. Pins 96 rising perpendicularly
ing downward near an end wall 225 of the upper sec 60 from the depressed area 191 through the openings 95
tion, the pin 25 being a loose ?t in a bore 26 of a side
hold the cassette in place against the respective pres
projection 27 formed in the head holder 6 adjacent the
sures of the pressure roller 13 and heads 4 and 5 as they
region where the arms 31 and 32 meet and the projec
are advanced through respective openings 97, 98 and 99
tion 16 extends. The holder 6 is thus pivotable about a
in the rear wall of the compartment 36, to pass through
vertical axis between the operating position shown in 65 the opening in the “front” wall of the cassette. The rear
FIGS. 2 and 3 and the retracted position; and pivotal
of the top surface of the cassette ?ts under two diagonal
about a horizontal axis because of the loose ?t between
overhanging portions 93 extending from the front of the
the unlocked and locked position, while retracted.
top surface of the upper housing section 1 adjacent the
7
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stationary supports 9, while an opening 101 across part
of the front of the compartment 36 provides access to
the rear wall of the cassette to aid in removing it from
the recorder.
The distance that the head unit 3 can move forward
into a cassette in the compartment 36 is limited by a pin
39, at the end of the arm 31, abutting a stop 40 molded
into the upper housing section 1, so that rotary position
about the pin 25 is also unambiguous.
Drive and Control Mechanisms
In addition to electrical controls not shown, the usual
mechanical control functions are provided. For exam
ple, one of the knock-out tabs 92 may be removed in
order to indicate that the cassette contains pre-recorded
tape and it should not be erased, as for recording pur
poses. As will be described below the recorder has a
novel sensing device for detecting that the knock-out
has been removed, and that the recorder should thereby
be disabled from operating in the recording mode. The
recorder mechanism also features a fast re-wind capabil
ity, temporary stop capability during recording or play
8
recorder, ?ts through the opening 65, a top edge of the
guide pin resting on the surface 63. The button 60 at one
end of the unit 59 rests on the guide face 62, and a guide
portion 67 at the end of an arm 78 of the bracket 58
bears against the guide surface 61.
The bracket 58 is further guided by a block 68 inte
gral with the housing section 1, and having a free end
projecting downwardly through a slot 69 in the bracket
58 near the button 60. The guide block has a projecting
10 tab 70 which retains an end of a leaf-spring 71 ?tting
between the guide block and the button 60, and biasing
the button outwardly while pressing the entire drive
unit toward the guide surfaces 61, 62, 63. Except when
the button 60 is depressed by the user of the recorder,
the leaf-spring 71 maintains the button 60 and bracket 58
in the position shown in FIG. 1, in which the pinion 54
is in mesh with the gear wheel 48 for driving the spindle
45. The pinion 54 is at all times coupled to the gear 53
by a friction coupling which may be of any well known
20 type, such as a felt disc and pressure spring, so as to
produce a substantially constant torque at the spindle 45
for winding tape on to the hub 43 during recording or
back, and a “quick repea ” feature which enables a user
playback. A lug 72 is also formed integrally as part of
the bracket 58, and extends immediately below the in
signal is actually being recorded on a tape. This last 25 termediate gear wheel 55, and is arranged to retain the
feature enables cost and size reduction by eliminating
intermediate gear wheel in position on the pin 73 re
the need for a meter element which shows that record
gardless of the position of the unit 59.
to check rapidly during recording whether or not a
ing is actually being obtained.
Tape speed during recording and playback is con
The tape transport mechanism is driven by an electric
motor 41 having a pulley 42 on its shaft, coupled by a
driving belt 79 to drive pulleys 56 and 74.
As shown in FIG. 1, the typical compact cassette 7
has tape hubs 43, 44 arranged to ?t over and be driven
trolled by a capstan 75 formed as part of a spindle hav
ing a pulley 74 at its lower end, around which the drive
combinations are ?tted and locked in place on journals,
The member 80 is positioned, so as to allow rotational
and longitudinal movement of the member, by a slot 81
belt 79 passes. The capstan spindle is journalled in a
metal bearing bushing 77 pressed into a boss 76 formed
integrally with the housing section 1. The arm 78 of the
by respective reel spindles 45, 46. The spindle 45 is
bracket 58 extends across the undersurface of the pulley
formed integrally with a disc 47 and gear wheel 48, and
74 so as to retain the pulley and capstan 75 in their
the spindle 46 is correspondingly integral with a disc 49
correct axial position.
and gear 50, the gear wheels being visible in the bottom
Selection of the recording function involves a switch
views, FIGS. 2-4. Each of these spindle-disc-gear as
ing member 80 shown in FIGS. 2 and 3, which may also
semblies is accommodated in a recessed casing 51, 52
be formed as a plastic molding. The member 80 extends
formed in the bottom 37 of the cassette compartment 36, 40
generally parallel to the end wall 225 of the upper hous
and having an opening in the casing side for driving
ing section 1, between the casing 52 and the motor 41.
access to the respective gear 48, 50. The spindle~gear
not shown, integral with the casings 51, 52, the journal
ling being of any of the types well-known in the art. 45 through which a downwardly extending pin 82 ?ts with
play, the pin 82 being integral with the housing section
When the recorder is in the Fast Rewind mode, de
1. At the rear end of the member 80 a locking cam 83 is
scribed later, the spindle 46 is driven through the gear
formed,
positioned to cooperate with a locking cam 84
wheel 50 by a drive train commencing with the pulley
formed at the remote end of the arm 31 of the head
56, which is made integrally with a large gear 53 that
can be moved to engage an intermediate gear wheel 55. 50 support 6. At its other end the member 80 has a record
ing button 85 located in an opening 86 formed in the
The gear 55 is rotatable on a pin 73 integral with the
front
wall of the housing section 1, and adjoining an
upper housing section 1, and is continuously in mesh
opening 87 in the bottom 37 of the cassette compart
with the gear 50. The gear 53 and pulley 56, and a pin
ment 36. As shown in FIG. 1, a sensor pin 88 connected
ion 54 are each rotatably journalled on a spindle 57
suspended from a movable bracket 58 which is part of a 55 to the recording button 85 projects into the cassette
compartment 36, for sensing whether or not a pre
movable drive unit 59 having a push button 60 disposed
recorded cassette has been inserted in the recorder as
in the opening 20 of the housing section 2, next to the
will be described later. The member 80 is urged rear
button 19. The bracket 58 and spindle can be one inte
ward within the recorder, so that the button 85 does not
gral plastic molding, or a metal spindle can be pressed
protrude
beyond the front wall of the housing 1, and
into the bracket.
simultaneously is biased rotationally about the pin 82 by
The unit 59 is guided for sliding movement on guide
a tension spring 89 having one end ?tted around a pin 90
faces 61 and 62 adjacent the end wall 225, the face 62
formed on the member 80, the spring extending
being at the same level as the surface 34 which guides
obliquely toward the rear of the recorder so as to bias
the support 6, and a surface‘ 63 on the bottom of the
casing 52 for the gear wheel 50. From the same surface 65 the cam 83 end of the member 80 away from the head
holder 6. An actuator rod 91 is pivotably connected to
63 an arch 64 depends, having an opening 65 there
the switching member 80 for operation of an electrical
through. A guide pin 66 attached to the bracket 58,
recording switch, not shown, for control of the well
generally parallel to the front and rear walls of the
4,127,883
9
known circuits for the motor drive and recording func
tions.
To keep the pressure roller 13 from pressing a mag
10
cassette; only the longitudinal position of the member
80 is affected. The following description is based on the
use of a cassette from which the relevant knock-out tab
has not been removed.
To load a cassette 7 in the recorder, the cassette is
?rst tilted slightly from front to back so that the rear
corners of the cassette pass under the overhanging por
tions 93, while the front edge of the cassette passes over
the rear edge of the compartment 36, in which the open
ings 97-99 are formed. The front edge of the cassette is
netic tape against the capstan during fast rewind, the
drive unit 59 is arranged so that depression of the button
60 will cause the head holder 6 to be rotated slightly,
sufficiently to move the pressure roller 13 out of pres
sure contact holding the tape against the capstan 75. To
accomplish this, on the unit 59 to one side of the push
button 60 a stop 102 is integrally molded, which cooper
ates with a forwardly projecting tab 103 formed on the
stop button 19. The travel of the button 60 is limited
sufficiently that the support 6 does not move to the
point where it is fully retracted and the end 21 can latch
behind the edge 22. Upon release of the rewind button
60, the leaf-spring 71 returns the drive unit 59 to its
original position, and the head holder 6 is rotated to its
then brought downward into the compartment 36 so
that the capstan 75 passes through the appropriate open
ing 94 and the locating pins 96 enter the two openings
95, positioning the cassette in the front-to-back direc
tion. At the same time the reel spindles 45, 46 pass
through and engage the hubs 43, 44 so that the hubs can
be driven.
operating position by the force of the spring 11, until the
.
Free downward movement of the front portion of the
pin 39 again abuts the stop 40.
‘
As shown in FIG. 4, the recorder also includes a 20 cassette is arrested when the lower raised portion 190
contacts the top edge of the movable cassette support 8
pause button 104, formed integrally with a pause lever
which projects above the depressed area 191 and ex
105 that is pivotable about a pin 106 projecting down
tends a short distance under the portion 190. By exert
wardly from an undersurface 206 of the upper housing
ing pressure on the cassette near its front, the movable
section 1 adjoining the boss 76 for the capstan bearing.
The lever 105 includes a button ‘portion which projects
through an opening in the end wall of the recorder near
the stop button 19, and a leaf-spring 107 extending from
the button end of the lever which bears against a stop
pin 109 formed integrally with the upper housing sec
25
cassette support 8 is pushed downward, thereby pivot
ing the head holder 6 slightly, about an axis which
passes through the surfaces 34 and 35 because of the
play in the opening 26 between the projection 27 and
the bearing pin 25. This downward movement basically
tion 1, so as to bias the button pivotally toward a disen
affects the arm 31 of the holder 6, so that the latch arm
gaged position. At the other end of the lever 105 a hook
portion 108 projects away from the pivot pin 106. The
28 is also moved downward against the pressure of the
leaf-spring 23, at least until the end 21 moves beyond
lever 105 rides on three contact surfaces arranged at the
, the edge 22‘ and the biasing force of the pressure spring
‘ same level of the upper housing section 1: edge 62 of the, 2 , 11 is no longer resisted by the latching action‘ against the
housing section, contacted by the button end; surface 35 edge 22. Under the urging of the spring 11, the entire ‘
206 located on the underside of the compartment 36,
magnetic head unit 3 now pivots on a vertical axis about
contacted by the pivot portion of the lever; and the
the point of contact between the projection 27 and the
edge surface 110 of a cut-out portion in the casing 51
pin 25, the leaf-spring 23 urging the top surface of the
and an adjoining guide ridge 111 on which the hook
arm 21 against the surface 33. As the magnetic head unit
portion 108 contacts. When the pause button is moved 40 rotates, the cassette support 8 slides along the underside
toward the front of the recorder, the hook 108 enters
of the cassette 7, and the pressure roller 13 and the
the opening in the casing 51 so as to engage the teeth of
magnetic head 4 and 5 pass through the openings
the gear wheel 48.
.
6 formed in the front wall of the casette until the pressure
As stated above, in the pause position the hook 108
roller 13 presses the magnetic tape in the cassette
engages the gear wheel 48, and prevents gear rotation 45 against the capstan 75. A slight further pivoting of the
so that the drive clutch for the gear 48 slips. To prevent
head holder 6 is, provided by the effect of an inclined
transport of the magnetic tape by the capstan 75, a pin
end 100 on the leaf-spring 23, along which the roller 30
113 extending downwardly from the lever 105 engages
moves so as to press the arm 28 still farther forward. In
a cam surface on a forwardly extending arm 112 of the
addition, spring‘ force from the hinge 14 of the pressure
pressure roller lever 12 such that movement of the but
roller lever l2‘may contribute to the pivoting bias of the
ton 104 to the pause position rotates the lever 12 rear
ward, away from the tape and the capstan 75. Prefera
bly, the cam surface on the arm 112 is so shaped that the
pause lever 105 is locked in the pause position, but can
holder 6, which continues to move until the pin v39 ~ ‘
comes against and abuts the stop 40 molded in the upper
housing section. At the same time resilient pressure
pads, which are provided in known cassettes of this
be manually returned out of the locked position, the 55 general type, hold the tape with proper force against the
spring 107 then returning and holding the pause lever in
operating faces of the heads 4 and 5. Because the tab 17
its neutral position in which an edge 114 of the lever
of the pressure roller lever 12 is now held free of the
near the button 104 engages an edge of the projection 27
stop-pin 18 formed on the arm 31 of the holder 6, the
of the head holder 6. Also, the leaf-spring 23 is so pro
pressure roller 13 may now provide proper transport
portioned that the head holder 6 remains in its operating
pressure against the magnetic tape independently of the
position even though the pause control has rotated the
position of the heads mounted on the arm 31.
pressure roller lever 12 against the pressure of the
Simultaneously with the ?nal stages of movement of
spring 11.
the holder 6, a switch (not shown) is actuated so that the
motor 41 is energized‘ and the playback electronic cir
Operation
1. Playback
Playback operation is not effected by the presence or
absence of the knock-out tabs 92 in the rear wall of a
65 cuits are turned on. The hub 43 is then driven by the
reel spindle 45 which in turn is driven in succession by
the gear wheel 48, the pinion 54, the friction coupling
between the large gear 53 and the pinion 54, and the
11
4,127,883
102 at the side of the button 60 engages the tab 103 on
the stop button 19, pivoting the magnetic head unit 3
sufficiently so that pin 18 engages the tab 17 on the
roller lever 12, moving the pressure roller 13 out of
forceful engagement with the magnetic tape against the
capstan 75. The hub 44 and spindle 46 are thus driven in t
a reverse direction at increased speed by the engage
stant torque onto the take-up reel or hub 43.
2. Recording
12
pinion 54 with the gear 48, so that the spindle 45 and
hub 43 are freely rotatable. At the same time, the stop
pulley 56 coupled to the large gear 53. At the same time
the capstan 75 is driven by the same movement of the
belt 79 which passes also around the pulley 74. In this
operating mode the gear wheel 55 engages only the gear
50, so that the spindle 46 and hub 44 can rotate freely.
Tape is thus drawn from the hub 44 past the heads and
the constant speed capstan 75, and is drawn under con
10 ment of the large gear 53 with the smaller gear 55.
The recorder is designed so that the recording mode
can be engaged only if the break-out tab 92 in the wall
of the cassette, aligned with the pin 88, has not been
At any time desired during the rewinding mode, the
rewind button 60 may be released. The leaf-spring 72
then returns the drive unit 59 to the original position,
and the head holder 6 pivots to its operating position in
is inserted into the apparatus, the pin 88 will project into 5 which the pin 39 engaggs the stop 40, restoring the
playback mode of operation.
the opening thus created, and the button 85 will not
project so that the operator cannot manipulate it with
5. Quick Repeat
his ?nger. Furthermore, movement of the button to the
removed. If such a tab is not present, when the cassette
recording position is impossible because of the engage
When the presence of a tab 92 in a cassette has per
ment by the pin 88 with the side of the knock-out hole.
mitted operation in the recording mode, fast rewind as
When a cassette with tab 92 in ‘place is inserted into
described above is accomplished by depression of the
the recorder, as the rear wall of the cassette passes
button 60 with all of the previously described effects.
under the overhang 93 the pin 88 is engaged, ‘and the
recording switching member 80 is moved longitudinally
Further, the movement of the head holder 6 as a result
of engagement of the stop 102 and tab 103 moves the
forward against the bias of the spring 89, to a point 25 locking cam 84 at the end of the arm 31 rearward to
such an extent that the corresponding locking cam 83
where the button 85 projects beyond the upper housing
on the member 80 is disengaged. The torque exerted by
section 1. Recognition of this condition is aided by
the oblique spring 89 then rotates the member 80 out of
making the button 85 of a striking color having strong
contrast with the color of the rest of the housing sec
the recording position to the playback position, the rod
tion. When the cassette has been placed in the appara
91 switching over the electronics, so that upon release
tus, by pressing with one ?nger against the protruding
of the button 60 the apparatus will operate in the play
back mode. It is thus possible for the operator to repro
button 85 the operator of the apparatus can then pivot
the member 80 about the pin 82, against the torque of
the obliquely arranged spring 89, so as to move the
actuator rod 91 and set a switch for the electronics into 35
the recording position. The tab 92 being in place, the
sensor pin 88 is thus free to slide over the rear wall of
the cassette.
duce and listen to the material that has just been re
corded on the rewound part of the tape.
6. Pause
As described above, the stopping mode not only stops
normal transport of the tape, but releases the magnetic
head unit 3 from the operating position, and locks it so
When the head holder 6 has been unlocked and
reached its operating position, as described under play 40 that the cassette is in position for removal. To permit
temporary interruption of playback or recording, with
back operation, the locking cams 84 and 83 engage so as
out preparing the cassette for removal, the pause button
to hold the member 80 in the recordingposition shown
104 and its associated lever 105 are provided. When the
in FIG. 3.
recorder is in the playback or recording mode, the but
3. Stopping
45 ton 104 which protrudes slightly from the recorder may
be engaged with one ?nger and moved toward the front
Tape transport can be stopped at any time during
of the recorder. This rotates the lever 105 about the pin
playback or recording by depressing the button 19 with
106 against the force of the leaf-spring 107, and causes
a ?nger, thus pivoting the head holder 6 about the hear
the hook portion 108 to engage teethv of the gear wheel
ing pin 25. The button should be depressed so far that
48, stopping the gear. At the same time the pin 113 on
the holder 6 moves to its fully retracted position, in
the pause lever engages the arm 112 formed integrally
which the edge 21 of the latching arm 28 will be pressed
with the pressure roller lever 12, moving the lever 12
upward by the leaf-spring 23 so as to lock behind the
and pressure roller 13 away from the tape in the cas
edge 22. By this motion of the holder 6, the pressure
sette, against the force of the spring 11. Thus, while the
roller 13 and heads 4 and 5 will have been withdrawn
entirely clear of the cassette, after which the locking 55 motor and capstan continue to rotate, the clutch con
necting the large gear 53 to the pinion 54 will slip, so
movement of the holder 6 causes the cassette support 8
that no tape transport will occur.
to move upward slightly, tilting the cassette slightly.
The magnetic head holder 6 will be maintained in the
Further tilting and removal of the cassette from the
operating position because of the force exerted by the
recorder is facilitated by the presence of the opening
60 inclined end 100 of the leaf-spring 23 against the roller
101 in the front wall of the cassette compartment.
30. Upon release of ?nger pressure on the button 104,
4. Fast Rewind
the pause lever 105 will remain in the pause position
because of the shape provided at the end of the arm 112.
Rapid rewinding of the tape while in the playback
The pause control can be returned to neutral position
mode is accomplished by depressing the button 60.
Against the pressure of the leaf-spring 71, the entire 65 by simple ?nger pressure on the button 104, moving it
back to the neutral position, thus permitting the gear
drive unit 59 is moved sideways, the guide pin 66 sliding
wheel 48 again to be driven and the pressure roller lever
in the opening 65 of the arch 64, until the large gear 53
12 to restore pressure holding the tape in contact with
engages the gear 55. This releases engagement of the
13
4,127,883
the capstan 75. If, on the other hand, a stopping opera
14
a magnetic head unit comprising a magnetic head
holder and at least one magnetic playback head,
means for moving magnetic tape in a cassette which
tion is performed by pressing the button 19 fully inward,
the pause lever will again be returned to its neutral
position when the head holder 6 moves to its retracted
position, and the arm 112 then no longer engages the pin
113. The button 104 is then returned to the neutral
i
has been inserted into the recorder in a direction of
tape transport past said at least one head,
means for mounting the magnetic head unit to the
position by pivoting of the lever 105 under the in?uence
housing section to be movable relative to the sec
of the spring 107.
The foregoing description is applicable to the pre
ferred embodiment shown in the drawing. Many alter
tion in a ?rst direction between a retracted position
in which a cassette can be inserted into or removed
from the recorder, ‘and an operating position in
which the magnetic head can operatively engage
native embodiments can also advantageously utilize the
invention disclosed and claimed herein. For example,
magnetic tape in a cassette which has been inserted
rather than having one movable and two stationary
cassette supports, three movable cassette supports can
be provided as portions of the head holder 6, either
formed integrally therewith or provided as members
rigidly attached to the support. One or two spring
loaded cassette supports could be connected to the
into the recorder; and in a second direction trans
verse to said ?rst direction of movement and trans
verse to said direction of tape transport, and
bottom 37 of the compartment 36; and the height of
those spring-loaded supports in the operating condition
means for supporting a cassette inserted in the re
’ corder so arranged that when the magnetic head
unit is in the operating position the position of the
cassette is de?ned relative to the magnetic head,
20
could also be determined by the head holder when it is
‘ said means for supporting including a movable
located in the operating position by the stop members.
Further, the unlocking member for the head holder
cassette supporting means integral with said head
holder for supporting at least a portion of the eas
se'tte adjacent said at least one head, the position of
need not be the movable cassette support 8, but may
take the form of a pawl mounted resiliently on the head 25
the movable cassette supporting means in said sec
holder, the pawl allowing movement of the magnetic
the operating position, being determined by the
head unit only when it is in a position depressed by the
cassette. Of course, rather than having the head holder
spring-loaded toward its operating position, it can be
biased toward the retracted position, and an operating
button can be used to provide force for moving the head
holder to and locking it in the operating position.
magnetic head-unit, so that upon inserting a cas
sette into the tape recorder, and movement of the
magnetic head unit to the operating position, the
The bottom of the cassette compartment can itself be
2. A recorder as claimed in claim 1 wherein said
ond direction, when the magnetic head unit is in
position of at least a portion of the cassette in said
second direction is determined directly by the posi
tion of the magnetic head unit.
eliminated, for example in the sort of apparatus in which
cassette supporting means also includes two stationary
the cassette is inserted through a slot. The cassette can
then be supported on a plurality of movable cassette
cassette supports, and wherein said movable supporting
means includes a single supporting member only, pro
supports which may be directly connected through the
viding localized support adjacent said playback head.
head holder and which, during movement of the head
3. A recorder as claimed in claim 2, wherein said
holder from its retracted to its operating position all
housing section includes a cassette compartment having
slide over the surface of the cassette. The only addi 40 a bottom wall and an opening through which said sup
tional location for the cassette may still be provided by
porting member protrudes, and said stationary cassette
locating pins, extending through the appropriate open
supports are formed by two surfaces formed in said
ings 95.
~
'
section and raised from said bottom wall remote from
Many other variations of embodiments will also be
each other and from the supporting member.
within the capability of those- skilled in the art, but 45 4. A recorder as claimed in claim 3, wherein the
within the scope of the invention. An alternative offer
means for mounting the magnetic head unit includes
ing practical advantages from the standpoint of noise
three surfaces of said molded section remote from each
and mechanical wear involves'synchronization of the
other and parallel to said bottom wall, said head holder
various functional effects of the quick repeat mode. If
when in the operating position being located along said
the push button 60 is not formed‘ integrally with the 50 second direction against said three surfaces.
bracket 58 of the drive unit 59, backlash can be intro
5. A recorder as claimed in claim 3, wherein said
duced so that the head holder 6 is ?rst moved by en
means for mounting the magnetic head unit includes a
gagement of the stop 102 with the tab 103 on the stop
pivot bearing having play so as to permit pivoting about
button 19, so as to lift the pressure roller 13 from en
two transverse axes, and said magnetic head holder has
gagement with the tape against the capstan 75 initially;
an arm extending under said bottom wall for positioning
and driving of the gear wheel 48 by the motor 41 can be
said holder about one of said axes.
interrupted by cutting off power to the motor 41, before
6. A recorder as claimed in claim 5, wherein said
engaging the fast rewind gears. After the backlash has
holder is formed as a lever having two arms extending
been taken up and the drive'unit 59 has been moved
from said pivot bearing; and said magnetic playback
back sufficiently, and the gear wheel 53 has engaged the 60 head, said supporting member and said arm extending
gear wheel 55, the motor 41 is re-energized. This pre
under said bottom wall are all located along a same one
vents the chattering noises produced by clashing of the
of said two arms.
gear teeth.
I claim:
7. A recorder as claimed in claim 2, wherein said
means for mounting the magnetic head unit includes a
1. A tape recorder for use with a cassette on which 65
magnetic tape is wound between two hubs, comprising:
a housing section formed as a unitary mass of molded
plastic material,
pivot bearing having play so as to permit pivoting about
two transverse axes, and stationary stop ‘means for 10
cating said magnetic head unit along said ?rst direction
when in the operating position, movement in said ?rst
15
4,127,883
16
axes.
said magnetic head unit being in the operating position,
the force of the ?rst resilient means provides operative
8. A recorder as claimed in claim 7, wherein said
housing section includes a cassette compartment having
a bottom wall and an opening through which said sup
the capstan.
direction being a pivoting movement about one of said
engagement of the pressure roller against magnetic tape
in the cassette to pinch the tape between the roller and
.
11. A recorder as claimed in claim 10, wherein said
second resilient means includes a spring which engages
a portion of the head holder, so arranged that when the
porting member protrudes, said stationary cassette sup
ports are formed by two surfaces of said molded section
raised from said bottom wall remote from each other
and from the supporting member, and said stop means
includes a stop surface formed in said section adjacent
said cassette compartment.
head holder is in the operating position the spring ap
plies biasing force in a direction also holding the head
holder in the operating position.
12. A recorder as claimed in claim 9, wherein said
movable cassette supporting means includes a support
member arranged to support at least a portion of a cas
a housing section formed as a unitary mass of molded
sette loaded in the recorder, said member forming at
15
plastic material,
least part of said means for pressing so arranged that the
a magnetic head unit comprising a magnetic head
exertion of manual pressure on said portion of a cassette
holder and at least one magnetic head,
placed in the recorder will move the head holder from
means for moving magnetic tape in a cassette which
the locked to the unlocked retracted position as inser
has been inserted into the recorder in a direction of
20 tion of the cassette is completed.
tape transport past said at least one head,
13. A recorder as claimed in claim 12, wherein said
means for mounting the magnetic head unit to the
means for locking includes a latching element rigidly
housing section to be movable relative to the sec
connected to said head holder and a surface formed in
1 tion in a ?rst direction between an operating posi
9. A tape recorder for use with a cassette on which
magnetic tape is wound between two hubs, comprising:
the housing section arranged for abutting engagement
“tion in which the magnetic head can operatively
engage magnetic tape in’ a cassette which has been 25 by said element when the head holder is in the locked
position, and said second resilient means bears against
inserted in the recorder, ‘and a retracted position in
said latching element.
which a cassette can be inserted into or removed
,
14. A recorder as claimed in claim 13, wherein said
from the recorder, and while in the retracted posi
latching element and said second resilient means are so
tion to be movable in a second direction transverse
transport direction between an unlocked retracted
arranged that, said head unit being in the operating
position, the second resilient means applies biasing force
and a locked retracted position,
in a direction also holding said head holder in the oper
to the ?rst direction and transverse to_said tape
. means for locking the magnetic head holder while in
' the locked retracted‘position against movement in
ating position.
‘
‘
15. A recorder as claimed in claim 12, wherein said
the ?rst direction toward the operating position,
means for manually moving the magnetic head holder is
-means for supporting a cassette inserted in the tape
recorder including a movable supporting means
integral with said head holder movable in the sec
ond direction such that upon movement of the
an actuating member movable through an opening in a
wall of the recorder housing, said holder member, mov
able head support and actuating member being one
integral mass of material.
magnetic head to the operating position the posi 40 16. A recorder as claimed in claim 15, wherein said
head holder is formed as a lever having ?rst and second
tion of the cassette is de?ned relative to the mag
arms extending from a pivot, at least one magnetic head
netic head,
being a playback head mounted on said ?rst arm, said
?rst resilient means for biasing the magnetic head
support member being formed on said ?rst arm adjacent
holder along said ?rst direction toward the operat
ing position, and means for manually moving the
magnetic head holder in opposition to said ?rst
45
said playback head, and said actuating member being
formed on said second arm,
said lever is pivotally mounted with play to said hous
ing section for motion about a ?rst axis in which
the magnetic head moves along said ?rst direction,
resilient means from the operating position to the
retracted position, and
second resilient means for biasing the magnetic head
' holder along said second direction toward the 50
depression of said actuating member moving the
magnetic head unit from the operating to there
locked‘position, and means for pressing the mag
netic head support from the locked toward the
unlocked retracted position in opposition to said
tracted position; and about a second axis transverse
to the ?rst axis in which the actuating member
undergoes only a substantially pivoting movement;
second resilient means.
10. A recorder as claimed in claim 9, wherein said
recorder includes a tape drive capstan arranged to en
gage tape in a cassette loaded in the recorder, and said
and
'
said means for locking includes a latching element
formed as part of said ?rst arm, pivoting about said
second axis so as to move said element into and out
magnetic head unit includes a pressure roller lever piv
otally mounted to said head holder and a pressure roller
rotatably mounted on said lever; said ?rst resilient 60
means bears against said pressure roller lever so that,
65
of abutting engagement with a latching surface
‘formed on said housing section.
‘
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UNITED STATES PATENT AND TRADEMARK OFFICE
CERTIFICATE OF CORRECTION
.
PATENT N0.
:
4,127, 883
DATED
1
November 28 ,
INVENTOR(S) :
1978
GILBERT E . MESTDAGH
it is certified that error appears in the above-identified patent and that said Letters Patent
are hereby corrected as shown below:
.
Col. 1, line 25, change "3,396,899" to ——3,394,899-—
Signed and Scaled this
Tweary-seventh
,D a y Of
May I 980'
{seam
.
Attest:
SIDNEY A. DIAMOND
Arresting Oj?cer
Commissioner of Patents and Trademarks
O
Q
Q
U
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