Magnetic tape head cleaning apparatus

Magnetic tape head cleaning apparatus
United States Patent ‘[191
[11]
[45]
Kara
[54] MAGNETIC TAPE HEAD CLEANING
APPARATUS
[76] Inventor:
Stephen Kara, 2609 Sapra St.,
[21] Appl. No.: 311,994
Oct. 16, 1981
[51]
Int. Cl.3 .............................................. .. G11B 5/41
[52]
U.S. Cl. .................................. .. 360/ 128; 360/137;
[58]
Field of Search ............ .. 360/128, 137; 15/210 R
15/210 ‘R
[56]
4,458,281
Jul. 3, 1984
Attorney, Agent, or Firm-Koppel & Harris
Thousand Oaks, Calif. 91360
[22] Filed:
Patent Number:
Date of Patent:
[57]
ABSTRACT
A housing of substantially the same shape and size of a
magnetic tape cassette is adapted to be inserted within
the cassette receiving aperture of the magnetic tape
playback/recording unit. Three resiliently biased arms
are independently and rotatably coupled about pivotal
points within the cassette housing. The disposition of
the tape head and the capstan roller of the playback
/recording unit causes the capstan drive to initiate rota
tion of a coupled gear train linking the independently
References Cited
rotatable arms. The surface used to clean the magnetic
U.S. PATENT DOCUMENTS
tape head is coupled to the capstan driven gear, the
resilient forces biasing the independent arms maintain
3,955,214
5/ 1976 Post et al. ......................... .. 360/128
4,141,053
2/1979
Kara ..... ..
4,149,206 4/1979 Loiselle
4,272,796 6/1981 Van Kreuninge
Primary Examiner—John H. Wolff
. 360/137 X
360/ 137 X
~ 360/128
ing pressure against the magnetic tape head while the
housing holding the ‘cleaning apparatus is maintained
within the playback/recording unit.
10 Claims, 7 Drawing Figures
U.S. Patent
Jul. 3, 1984
Sheet 1 of2
4,458,281
U.S. Patent
Jul. 3,1984
Sheet 2 of2
4,458,281
4,458,281
1
MAGNETIC TAPE HEAD CLEANING APPARATUS
BACKGROUND OF THE INVENTION
1. Field of the Invention
any cleaning action.
.
ment adapted to be used for cleaning magnetic tape
2. Description of the Prior Art
‘
Another prior art device is disclosed in US. Pat. No.
The present invention magnetic tape head cleaning
apparatus generally relates to the ?eld of cleaning
equipment, and more particularly to cleaning equip
heads.
2
cannot be asserted against the strip to force it against the
magnetic head. Such pressure would in effect stop the
rotation of the capstan or otherwise halt the movement
of the strip through the cassette and thereby prevent
3,761,994 (1973), which discloses a spring biased clean
ing apparatus for magnetic tape cartridges. The inability
to utilize a structure such as this is evident. An arm is
10
_
The increased use of magnetic tape as a source for
entertainment and other purposes has resulted in a need
for more efficient ways to maintain the equipment. The
cassette tape playback/recording units being used
within automobiles and other applications have several
characteristics in common. The units which utilize cas
sette mounted tapes use a standardized cassette package.
In addition, the cassette is inserted within an aperture or
within a fully covered receiving area in the-playback
/recording unit, which unit is designed to prevent di-.
rect access to the magnetic tape head or the capstan and
pinch roller which provides the motive force to the
tape.
disposed from the front to the rear wall of the cartridge
a manual handle moves of the cleaning pads laterally
across the magnetic tape head. The inadequacies of this
device as applied to magnetic tape cassettes is evident.
Since the cassette playback/recording units include an
internal, covered compartment into which the magnetic
tape cassette is inserted during operation, the movement
of the cleaning member must be self-contained as there
is no access to the internal members of the cassette.
Another device disclosed by the prior art is Appli
cant’s US. Pat. No. 4,141,053 (1979). This device dis
closes a pair of spring biased arms which are rotatable
about the hubs of the conventional housing. The present
invention improves upon the device taught therein by
utilizing a direct drive between the gear receiving the
It has long been recognized that continued use of a 25 capstan surface and the cleaning head.
playback/recording unit will result in the accumulation
of dirt or other debris at the magnetic tape head, erase
The present invention substantially solves those prob
lems left unresolved by the devices disclosed in the
head, capstan and pinch roller. The accumulation of dirt
prior art. Although the industry has attempted to main
or other debris results in degraded reproduction from or
tain strict standards with respect to magnetic tape play:
recording of the magnetic tape because of interference 30 back/recording units, it is well known that there is a
at the head gap. -If left alone, this can result in a failure
variation of commercially available units, e.g., whether
of the playback/recording unit.
4
they
are provided with or without tape guides. The
The difficulty in gaining access to the magnetic tape
positioning
of tape guides can render many of the de
head has lead to the development of devices which are
disclosed'by the prior art, none of which satisfactorily 35 vices disclosed by the prior art useless for the intended
purposes. In addition, any variation in the placement of
solve all of the inherent problems. One of the devices
the magnetic tape head capstan roller and device can
disclosed by the prior art uses a tape cartridge having an
also
lead to inoperability of a cleaning device. The need
abrasive material mounted in place of the tape. The
for cleaning the magnetic tape head arises out of the
cleaning action of the magnetic tape heads is mechani
cal in nature and is intended to abrasively rub all dirt or 40 structure of the magnetic tape head itself. The magnetic
tape head assembly involved typically comprises sepa
debris from the fact of the magnetic tape head. The
rate heads for the particular number of recorded tracks
problem with this type of device is apparent. The mag
of the tape being used. Each magnetic head i's'typically
netic tape head is a sensitive component made of small
constructed of two identical core halves built of thin
subcomponents, and contacting the surface of the mag
netic tape head with an abrasive tape can eventually 45 laminations of magnetic alloy material. Each half is then
wound precisely with an identical number of turns and
result in damage and possible destruction of the mag
netic tape head.
.‘
Another device disclosed by the prior art incorpo
assembled with non-magnetic separators at the front
and rear with a miniscule gap remaining at the bottom
of the head which contacts the magnetic tape. As the
rates a mounted felt strip within a magnetic tape cas
sette. The felt strip is urged through the cassette in the 50 tape transport draws the tape across the head, the gap
between the core halves is shunted, and the magnetic
same manner as magnetic tape. The device is intended
?ux path is completed. The head gap is critical in both
to clean the magnetic tape head by impregnating the felt
the recording and reproduction phase of the process.
strip with isopropyl alcohol or other like cleaning ?uid
When recorded tape is drawn across the gap of the
and allows the movement of the felt strip across the
magnetic tape head to clean dirt and other debris from 55 head, the portion of the tape in actual contact with the
the magnetic tape head. Several problems remain un
solved through the use of this device. Since the felt is
mounted within the tape cassette to move therethrough
in a manner analogous to tape, there is a substantial
volume of felt material. This results in the cleaning ?uid 60
gap bridges the magnetic core of the head causing mag
netic ?ux to ?ow through the core. The head gap size
depends on the intended function of the head. For a
at the point of contact with the magnetic head, thus
record head, it must be wide enough to permit the flux
to penetrate the tape deeply, yet narrow enough to
obtain sharp gradients of ?ux. For a reproduction head,
gap size must be a compromise between the upper-fre
quency limit, dynamic range and head life. Extremely
thereby minimizing the cleaning effect of the device.
close mechanical tolerances are inherent in the head gap
being defused substantially throughout the felt. The
result is a very weak concentration of the cleaning ?uid
Another problem resides in an inability to apply suf? 65 as well as the ?ux position of the tape and magnetic
cient pressure on the tape head to carry out the cleaning
head. If dirt or other debris lodges on the surface of the
magnetic tape head or within the head gap, the strength
function. Since the felt strip is mounted in a manner
analogous to the magnetic tape, signi?cant pressure
of the magnetic flux will be deleteriously affected.
4,458,281
3
tus can appropriately adapt to variations in the place
ment of capstan drive and roller and will maintain ap
propriate pressure against the magnetic tape head to
insure a proper cleaning motion irrespective of whether
the recording/playback unit utilizes a tape guide. The
spring biasing of the internal members will insure ap
ditions will occur from the scraping effect which exists
as the top ‘oxide layer‘passes over the tape head. The
oxide build-up and dirt and debris physically disposed
on the magnetic tape ‘are all contributing factors to
_
I
propriate cleaning of the magnetic tape head under
substantially all conditions.
Tape transports utilizing cassette mounted magnetic
tape present a different problem with regard to cleaning
It is therefore an object of the present invention to
provide an improved magnetic tape head cleaning appa
the magnetic tape head assembly. Magnetic tape cas
settes are generally mounted with apertures which sub
stantially preclude access to the magnetic tape heads or
are mounted within compartments which preclude any
access to any of the lateral edges of the cassette. Since
the magnetic tape" ‘head is virtually inaccessible, the
need for the present invention has arisen.
'
ratus.
ratus.
The present invention utilizes three independently
the capstan drive. The arms are resiliently biased about
' The novel features which are believed to be charac
25 teristic of the invention, both as to its organization and
irrespective of minor variations in the placement of the ’
-
-_
,
The present invention comprises an apparatus for
providing means to clean'the. magnetic tape head assem
bly of a playback/recording unit adapted .for mounting
tape cassettes. It is to be noted that the present invention
It is still yet another object of the present invention to
provide a magnetic tape head cleaning apparatus incor
porating means for cleaningthe capstan of the magnetic
- tape transport.
appropriate forces against the tape head. The magnetic
tape head will be subjectedto sufficient cleaning motion
~
-
ratus mounted within a tape cassette.
which will permit cleaning of both the tape head and 20.
- v capstan roller and driveand the presence. or absence of
»
It is still another object of the present invention to
provide an improved magnetic tape head cleaning appa
*
three independent points within the cassette housing
independent of the cassette housing. The capstan drive
is urged-against a geared surface having ‘a surface which
will rotate about its axis at the‘ speed of the capstan
drive. A planar gear transfers the rotation .thereof to the
capstan cleaning head, the resilient forces imposed on
the gear. train and the arms holding same maintaining
‘
It is another object of the present invention to pro
vide a non-abrasive magnetic tape head cleaning appa
rotatable arms which are resiliently biased in a manner
the guides.
.
present invention magnetic tape head cleaning appara
- tions, the magnetic tape head must be cleaned to re
move any dirt or debris which accumulates. These con?
reduced tape head operation.
4
rotation to the cleaning surface. When operating‘, the
Therefore, in order to maintain proper operating condi
method of operation, together with further objectives
and advantages thereof, will be better understood from
the following description considered in connection with
the accompanying drawing in which a presently pre
ferred embodiment of the invention is illustrated by way
of example.’ It is to be expressly understood, however,
thatv the drawing is for the purpose of illustration and
description only and is not intended as a definition of
the limits of the invention.
= BRIEF'DESCRIPTION-OF THE DRAWINGS
FIG. 1 is a'front perspective view of one form of a
can be adapted for cleaning the magnetic tape heads of
magnetic tape transport adapted for using cassette
eight~track cartridge transports, but for the purpose of
example, cassette equipment shall be discussed.
mounted magnetic tapes. I
_
' SUMMARY OF THE INVENTION
A housing having substantially the same shape as a
'_"FIG. 2 is'a front perspective view of an exemplary
magnetic tape vhead to be cleaned in accordance with
the present invention.‘
. "FIG. 3 is a front perspective view of the present
invention cassette tape head cleaner illustrating the
magnetictape cassette provides for mounting the
cleaning apparatus. A cassette housing is utilized to 45 qu'iescentposition of the cleaning portion of the present
providerthe supporting structure for the present in
invention.
vention magnetic tape head cleaning apparatus.‘ A
rotatablevsurface adapted for contacting the capstan
FIG. 4 is a top plan ‘view of the interior of a form of
the present invention magnetic tape head cleaning appa
ratus.
roller is rotatably coupled to a first ‘arm which is
pivotable about an axis positioned along the front of 50 FIG. 5 is a top plan view of the interior of another
.form of the present invention magnetic tape head clean
the housing. The opposite end of the ?rst arm is resil
ing apparatus showing an alternate structure for apply
iently coupled to a point within the‘housing permit
ing resilient forces to the interior arms.
ting lateral movement of the ?rst arm between points
FIG. 6 is a partial cross-sectional view taken through
which are limited by an opening in the housing and
the second arm.‘ A planar transfer gear is coupled to 55 line 6-6 of FIG. 4.
FIG. 7 is a bottom plan view of the form of the pres
the capstan driven gear, the planar transfer gear being
ent invention vshown in FIG. 4.
‘
rotatably coupled to vthe second arm. The rotatable
motion of the capstan drive is driven through the
DETAILED DESCRIPTION OF THE
'capstan driven gear, ‘planarltransfer gear to the tape
PREFERRED EMBODIMENT
head cleaning surface. The second arm is again resil
An
understanding
of the use of the present invention
iently coupled in a manner which will cause said sec
magnetic tape head cleaning apparatus can be best
ond arm to maintain a sufficient force against the tape
gained by reference to ‘FIG. 1 wherein an exemplary
head, cleaning surface in order to satisfy the objec
tives of the present invention. '
._
magnetic tape cassette recoding/playback transport
When the present invention magnetic tape head .65 unit‘ is shown, the transport unit being generally desig
cleaningapparatus is inserted within the recording/
playback unit, the position of the capstan roller causes
rotation of the capstan driven member transferring said
nated by the reference numeral 10. Magnetic tape trans
port unit 10 is typically a reproduction unit adapted to
receive magnetic tape cassettes. Transport unit 10 em
4,458,281,
5,
6
ploys an internal compartment 11 accessible by cover
riorarms of the present invention after housing 40 is
inserted (within a transport ltlznand FIG. 4 shows their
12. A tape cassettevis placed within compartment 11_
.
position before‘ housing ,40 is inserted and beforethe
interior arm contacts capstan drive 16. Spr'ing‘biased
armsv 50, 51 and '52narepivotally coupled about projec-l
during operation of transport unit ‘.10. As illustrated,
magnetic tape head 13, erase head 14, capstan pinch
roller. 15 and capstan drive 16 can be seen. When a
tions 54, 55 and 56 respectively.‘ depending‘upwardly
cassette unit‘is disposed .within compartment 11 and
from surface 53of housing 40. Capstan driven wheel
member 57 is rotatably coupled‘ about projection 58
extending from spring biased arm 50. Mounting means
cover 12 moves into position, none of the lateral edges
of the tape cassette will be accessible. As shown in FIG.
1, the cassette will be disposed upon hub drive 17, but
the tape cassette itself will be essentially inaccessible. It l0 in the housing supports the drivenywheel ‘member bje
is to be understood thatthe form of the transport unit 10
shown in FIG. 1 is for the purpose of example only. The
tween'two positionsasexplained in more detail below.‘
present invention magnetic tape head cleaning appara
tus will function properly in all conventional transport
40 in order ‘to receive capstan driye 16. In the exem
Aperture 59 is disposed vthrtiugh surface53 of housing
plary embodimentkthe mounting means for the driven
15
wheelvmernber comprises spring biased arm ‘50, which
For the purpose of example, the magnetic tape trans
port unit 10 shown in FIG. 1 will be used to explain the
present invention. The preferred form of the magnetic
tape head cleaning apparatus is disposed within com
partment 11 of the transport unit 10 in substantially the 20
in FIG. 4 is rotated from a ?rst position in which driven
units which utilize cassette mounted tape.
same manner as the magnetic tape cassette which is
wheel member 57 is in contact with capstan drive 16
extending through opening§59hcounterclockwise to a
second position‘ where capstan‘ wheel 57 is out ‘of
contact with capstan drive 16. The second position
(FIG. 4) provides unrestricted insertion of capstan drive
16 within aperture 59. A clockwise resilient forceis
intended for use within transport unit 10. The structure
applied to the end of spring biased arm 50 opposite
of magnetic tape head cleaning apparatus is described in
projection 54 through the use of 'a helical spring 60. As
FIG. 2. Magnetic head assembly 20 comprises an outer
housing 26 having a convex pro?le 28 vadequate for 25 will be described below. the present invention also has
a head cleaning ,wheel'72 and wheel mounting means in
interface with the magnetic tape disposed within a suit
the housing for mounting the wheel adjacent the head.
able cassette. Head assembly 20 (FIG. v2).comprises a
2-track magnetic head consisting of two magnetic heads
In the exemplary embodiment, the wheel mounting
29, each made up of a pair of core halves typically built
means comprises arm 51 which‘ is mounted on pivot 55
of thin laminations of alloy materials. One pairof heads 30 extending upward from bottomwall 53 of housing 40.
is necessary since the magnetic tape stored within a
cassette is recorded by placing two recorded tracks on
each half of the tape. Each core half is precisely wound
with a predetermined number of turns and assembled
with non-magnetic separators at the front and rear of
the head with a small gap 30 separating the core halves.
The spacing between magnetic heads 29 becomes im
portant to eliminate cross-talk between tracks. .
Blocking means on the wheel mounting means blocks
movement of the mounting means of the driven member
from the second position to: the first position. In the
exemplary embodiment, the blocking jmeans'comprises
projection’ 61‘ extending upward from arm 50 and a
detent 62 on arm;5I'engaging'projection 61 when arm
50 is in its second position, When housing 40 is'inserted
within tapetransport '10, 'tape head ‘13causes spring
biased arm,51 to; rotate about projection 55 and release
In operation, when magnetic tape is drawn across gap
30, the portion of tape in actualcontact with the gap 40 projection 61 from detent 62. As soon as projection 61
is released, the force imposed by spring 60 will permit
bridges the gap between the magnetic core halves caus
spring biased arm 52 to rotate clockwise and urge'cap
ing magnetic flux to ?ow through the core. As transport
stanvdriven'wheel 57 againstthe capstan drive 16.
10 draws the tape across surface 28 of head assembly 20,
I Capstan drivenwheel 57 comprises a resilient surface
gap 30 is shunted and the flux path through each of the
magnetic heads 29 is completed. If dirt or other debris 4,5 63 and integral , gear 64 which concentrically rotate
aboutthe axis of projection 58. When capstan driven
lodges in gap 30 or causes-a shunted medium to exist
wheel ‘57‘is in contact with capstan drive 16, a rotating
between adjacent tracks, the performance of magnetic
force imposed by gear 64 is transferred to planar trans
head assembly 20 and therefore transport 10 would be
seriously degraded. It therefore becomes obvious that
fer. gear 70,‘,w'hich rotates about projection'55 on spring
means must be provided to remove effectively any dirt 50 biased arm‘51. Axis of transfergear 70 is also the ‘axis on
or debris which may. become lodged between any pair
of core halves of a magnetic head 39 or between adja
cent tracks.
a
The present invention magnetic tape head cleaning
apparatus comprises an outer housing 40 (FIGS. 4—7)
which is constructed similar to the magnetic tape cas
settes used with transport 10 (FIG. 1). The front wall of
housing 40 has three apertures 41, 42 and 43 to interface
whicharm n51 pivots. Although the use of meshing gears
64 and} 70 is the preferred form of the present invention,
it is understood thatvplainar gear 64 can be replaced by
a belt androllierv assembly transferring the'rotational
55 force to the capstan drive 16 to a receiving roller which
is made integral with transfer gear 70..
Projection 71 depends upwardly from the end of
spring biased arm 51 which is located adjacent aperture
42. Head cleaning wheel 72 comprise a non-abrasive
with the structural assembly of transport 10. Aperture
43 receives the capstan pinch roller 14. Aperture 42 at 60 surface 73 and an integral planar gear 74. Non-abrasive
surface 73 comprises an unsymmetrical rotating surface
the center of housing 40 will be in cooperative relation
about projection_71. Although non-abrasive surface 73
ship with magnetic tape head 30. Aperture 41 in the
can be made uniform, the use of an unsymmetrical sur
front surface of outer housing 40 will lie adjacent and be
face to be disposed against tape head 13‘ will provide a
adapted to be- urged against the capstan drive 16 upon
reversed insertion of housing 40. Drive hubs 44 are 65 broader cleaning area when the non-abrasive surface 73
adapted to be disposed about shaft 17 of transport 10.
FIGS. 4, 6 and 7 show a preferred form of the present
invention. FIG. 7 illustrates the placement of the inte
.is imposed against tape head 13. ‘For the purpose of
de?ning the geometry of surface 73, it shall be deemed
to be unsymmetrical vto the extent that the radius be
4,458,281
7
tween surface 73 ,and projection 711s,‘ variable. As can
be best. seen FIG- t..i>ldnaf.~séar 1411s ‘mated by the
rotational force
16on driven wheel
5711\nd. iar'imegru gear “through dense; of, planar
transfer gear Gears 64," 70: and 74f'o'f ‘theexemplary
50 in a clockwise direction in the absence of engage
inent of projection 61 by detent 62. Upon the insertion
of the tape head cleaning apparatus into tape transport
10, tape head 13 is urged against cleaning wheel 72
embodiment are considered coupling means that extend
causing spring biased arm 51 to rotate in a counter
between driven member‘57 and cleaning wheel 72 for
clockwise direction, which releases projection 61. The
rotating the cleaning gwheel when the capstan rotates
the'driyenwhéel-
1
'
,
.,
v‘
r
,
f
_
.
resilient force imposed by helical spring 60 urges cap?
p
stan driven wheel 57 against capstan drive 16 causing
In :1»:v fomi 9f the. new nvemiqnislwwn in FIGS
the rotation of capstan drive 16 to be transferred to
wheel 57 and the engaged gears. The rotational force of
4, 6 and 7,'t,h’6..ii1‘_iii 51,,is Vb" " through the use of helical
spring '15: Helical spr'in .. . is. .is‘posédbetwecn arms 51
and'52 causing
capstan drive 16 is transferred through transfer gear 70
to head cleaning wheel 72. The resilient force imposed
by helical spring 75 (FIG. 4) or resilient extension 90
(FIG. '75) insures that head cleaning wheel 72 is main
51'to r tate in'a clockwise manner
about'projection 55. This [will insure that there is a
resilient force, urging the non-abrasive , surface 74
againsttape head 13.
The pr
vnt "
ven'
I
tained in sufficient contact with tape head 13 to insure
removal of any debris disposed on tape head 13.
_In order to clean the surface of capstan drive 16, the'
‘on also-provides ‘means for clean
ing the surfaceoftlie‘capstandrive. Spring biased ‘arm’
52 is rotatable about'pr'ojection56. Cleaningésurface' 80
isvdisposed at oneicndthcrqotiths "mats end being
present invention tape head cleaning apparatus is in
serted so that cleaning surface 80 is adjacent capstan
subjected rota resilient race impas'édbyhslicall spring
drive 16. As described hereinabove, end 100 of spring
biasedarm 50 is placed in the position shown in FIG. 4
81.
52 appropriately,
In order to limitprojection
the rotation
82 depends
of‘the spring
upwardly
biasedfrom
arm 52 and is disposedwithin slot83'of connecting
8
In this position, helical spring 60 is stretched imposing a
resilient force which would rotate the spring biased arm
, (or'FIG. 7). The disposition of tape head 13 against
34. Connecting arm 84 is pivotally coupled; to spring 25 head cleaning wheel 72 will release projection 61 from
biased
_50 and thereby
detent 62 causing surface 80 to be urged against ‘the
rotating capstan drive providing for an appropriate
,the‘rotatior'i of spring
~ ‘ other form of thepresent invention can be seen in
cleaning operation.'
no. s wherein an‘ alternate l vsmrcgin; forjthe resilient
forces imposed byh'e'lieal springs ‘75 and181 ,ar'esh’own,
For the purpose‘o‘f simplicity, elements havingucore'7
sponding parts in FIG. 4 are'given likev referencqiilumer
recording/playback
als._ As was described hereinabovehelical springs 75
,a clockwise ‘forceupon s
51 in
order to insure that head cleaningd?heel '72 is urged
transport'unit utilizes a tape guide or has minor varia
35 tions in the placement of the capstan roller and drive,
the present invention cleaning apparatus operates effeei
debris from tapehead v13. An alte , Hate‘ fdrm’bf thepre's-v
tively.
entinvention replaces helical spring 1 Ffand itsconnec
,1;
40
45
to be‘ resiliently urged against 'Ytape ‘head 13. In a like
manner, helical spring 81' is replaced by resilient projec
tion 94 which is disposed against side wall QS‘of housing
50
inverted position
'
V
'
1. An apparatus for cleaning the magnetic tape head
of a'magnetic tape transport having a driven capstan
'
(a) a housing having front and bottom walls, the front
wall having at least a head aperture adjacent the
head of the transport and a capstan opening adja
cent the capstan of the transport;
(b)' a driven member in the housing, driven member
mounting means in the housing for supporting the
driven member between two positions, the ?rst
position mounting the driven member in contact
with the'capstan of the transport and the second
position _ mounting the driven member out of
As will be described, when the present invention tape
head-cleaning appaamns' in'smeainstanspon 10 in an
contact with the capstan, means for biasing the
driven member mounting means toward the ?rst
drive is positioned‘ against
cleaning head 80 tending to rotate'arm 52 counterclock
wise‘ about projectionf56. The resilient ‘forces imposed
'
roller comprising:
" ward force
duce
againstIanheat?
QPPOSlIlg
chatting
forcefeausing
Wheel .72,hésa
,cttsns
cleaning'whe'el 72
‘
Iclaim:
51 and vis disposed between projections 21 ‘and 92 which
depend inwardlyfromiwall '93 of housing 40."When‘ the
present invention
damn‘ apparatus" is ~in»
med and. thstapé
i
magnetic tape head and capstan drive of a conventional
unit which utilizes cassette
mounted magnetic tape. Irrespective of whether the
against warhead, 13’, with 'sii'f?éichtf'fq'réc t6. Qléan ‘any
tion to spring biased arm 52'with resilient extension 90'.
Resilient extension, 90 is integral with spring biased arm
'
:“The present invention magnetic tape head cleaning
apparatus provides improved means for cleaning the
position;
55
(c) a head cleaning wheel and wheel mounting means
by extension 94 against sidewall 95 will oppose the
forceimposed
an
appropriatebyforce
capstan
against
drive capstan
16 thereby
drive 16 and
in the housing for mounting the wheel adjacent the
head, the head mounting‘ means being movable
thereby allow cleaningof same.
two positions;
_
under influence of the head on the wheel between
I ‘I "
(The) use of the present invention can be best under
stood by reference to FIG“.i 4and FIG._ 7.,Prior, to inser
tion of the presentv invention tape‘headcleaning appara
tus, manual ‘force ‘ is’ imposed upon end'100 of spring
biased arm 50, which extends out of a secondary ‘open
ing in the rear of housing 40, urging end 100 tothe right
until projection 61 isengaged by detent 62._ By rotating
spring biased arm' 50,_' aperture 5? v is unobstructed
thereby‘ allowing for the'insertion of capstan drive 16.
65
((1) blocking means on the wheel mounting means for
blocking the movement of the driven member
mounting means from the second position to the
‘ ?rst position in a ?rst position of the blocking
means and releasing the driven member mounting
means to its ?rst position when the blocking means
is in its second position; and
(e) coupling means extending between the driven
member and the head cleaning wheel for rotating
9
4,45 8,281 .
10
the head cleaning wheel when the capstan rotates
gear engaging the ?rst and second gears for transferring
the driven member.
2. The apparatus of claim 1 wherein the driven mem
ber mounting means comprises a ?rst arm, the driven
rotation from the ?rst gear to the second gear.
7. The apparatus of claim 1 wherein the wheel mount
ing means includes a wheel shaft for mounting the head
member being mounted near one end of the ?rst arm,
and a second end of the ?rst arm extending to a position
cleaning wheel for rotation about the wheel shaft, the
head cleaning wheel being asymmetrical about the
in the housing where it can be engaged manually to
move between its ?rst and second position.
3. The apparatus of claim 1 wherein the blocking
means comprises detent on the wheel mounting means,
the driven member mounting means having a projection
wheel shaft.
8. The apparatus of claim 1 further comprising a
capstan cleaning member and capstan cleaning support
means in the housing for mounting the capstan cleaning
member between two positions, the front wall of the
enganging the detent, the wheel mounting means pivot
ing about a second axis in the housing whereby the
detent and the projection release each other when the 15
head urges the head cleaning wheel to pivot the wheel
housing having an additional opening, the ?rst position
of the capstan cleaner support member being adjacent
the third opening, and the second position being away
from the third opening.
9. The apparatus of claim 8 further comprising link
age means extending between the capstan cleaning sup
port member and the driven member mounting means
secondary opening in the housing spaced from the front
for moving the capstan cleaner support member to its
wall, a portion of the ?rst arm extending through the 20 second position when the driven member mounting
opening where it is accessible to move such end of the
means is in the ?rst position and moving the capstan
?rst arm to pivot the ?rst arm.
cleaning support member to its ?rst position when the
5. The apparatus of claim 4 wherein the intermediate
driven member mounting means is in its second posi
transfer gear is mounted for rotation on the wheel
tion.
mounting means.
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l0.'The apparatus of claim 8 further comprising bias
6. The apparatus of claim 1 wherein the coupling
ing means connected to the capstan cleaning support
means comprises a ?rst gear mounted for rotation with
means for urging the capstan cleaning member toward
mounting means about the second axis.
4. The apparatus of claim 1 further comprising a
the third opening.
the driven member, a second gear mounted for rotation
on the head cleaning wheel and an intermediate transfer
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