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CONTENTS
Page
Machine speed ........... Ten era iareeiieo, 1
Threading the machine er era TD rarariramio.. 182
Inserting a new needle ...... aaa rraerrrrararióeo, 2
Inserting and removing the bobbin ee EEE rranrriieo 2&3
Winding bobbins ea area errraa ramiro, 384
Regulating the thread tensions a 4
Adjusting the stitch length... Ta ia ararrnerea oa, 5&6
To do tacking and to reverse direction of feed (Model 256 only) ...... 6
Adjusting pressure of the presser foot 6 & 7
Lubrication ... aer Tarna aerea ire eeLiies 7
Safety clutch na irrarea ee 8
Information for adjustment ........................ 889
Timing sewing hook with needle....................................... 8 & 9
Relative position between bobbin case and opener 1, 9
Adjusting lift of the alternating presser foot 1110 10
Model 244 Model 256
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MACHINE SPEED
Maximum operating speed of the machine after a break-in period is 3000
stitches per minute. Of course, speed of machine also depends on type of
material being sewn and kind of thread used.
To assure durability and trouble-free operation, it is imperative that for the
first several weeks of operation the maximum speed is held to not more than
2500 stitches per minute in order to allow the parts to become properly
broken in.
THREADING THE MACHINE
See Fig. (1)
Set Screw for Thread Guide
(11) Needle Set Screw
Turn handwheel toward you until needle (10) Fig. (1) reaches the highest
point of its travel. From the thread stand lead the thread from back to front
through the first hole in the guide pin (1) on top of the machine arm, and
then through the long hole in (1) from right to left, down to the upper guide
hole of the thread guide (2) from right to left. Pass thread in weaving fashion
through the other two holes in (2) and from right to left over and between
the tension discs (3). Now pull thread downward from right to left beneath
and around thread controller (4); continue to pull thread upward through
the fork in the thread controller and against the pressure of the check spring
(5). Guide thread upward through thread guide (7) and from right to left
through the eye in take-up lever (6), down through thread guide (7) again
and then through the thread guides (8) and (9) and from left to right through
the eye of the needle. Pull two to three inches of thread through the eye
of the needle,
INSERTING A NEW NEEDLE
See Fig. (1)
Turn handwheel toward you until needle (10) reaches the highest point of
its travel, loosen the needle set screw (11) about one turn, pull out the old
needle and insert a new one. Push the needle up into the needle bar as
far as it will go, setting its long groove toward the left with the eye of the
needle going from left to right. Tighten needle set screw securely. Use
standard style 135x117 (Cat. No. 3355) needles in sizes suitable for your
particular kind of sewing.
INSERTING AND REMOVING THE BOBBIN
Threading the Bobbin Case
See Fig. (2)
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Push open the right hand cover plate (1) Fig. (2) in the bed of the machine.
Pull up latch (2) of the bobbin case and lift the bobbin (3) from the bobbin
case.
To insert a full bobbin, hold it on one of its sides between thumb and
index finger of your right hand. Be sure that the thread draws out from
the bobbin left to right. Place bobbin on center post (4) of bobbin case
and push down latch (2). Pull thread into slot (5) inside of bobbin case
and to the left under tension spring. Draw out about two to three inches
of thread. Close cover plate (1).
Fig. (3) illustrates the bobbin case after it is threaded.
WINDING BOBBINS
See Fig. (4)
The bobbin winder is mounted on the table top with its pulley in front of
the driving belt so that the pulley will separate from the belt after the bobbin
has been wound with sufficient thread.
Push the bobbin on bobbin winder spindle as far as it will go. Pass thread
from thread stand downward through eye (1), Fig. (4) in tension bracket;
then between and around the back of the tension discs (2) bring thread
forward toward bobbin (3) and wind from below in clockwise direction several
times around bobbin. Push bobbin winder lever (4) downward until wheel
(5) contacts the drive belt (6) and then start machine. After bobbin is filled
with thread, release will cause wheel to disengage from belt and winding
will stop. Cut thread and remove bobbin from winder spindle.
Adjustment screw {7) can be turned in or out to increase or decrease the
amount of thread wound on the bobbin.
When fine thread is wound on bobbins, use light tension. It is regulated
by turning the knurled nut {8} on the tension bracket at the rear of the
bobbin winder. Bobbin can be wound while the machine is sewing.
REGULATING THE THREAD TENSIONS
For ordinary stitching, the tension of the upper and lower threads should
be equal so as to lock both threads in the center of the fabric. If the ten-
sion on either thread is stronger than on th2 other, imperfect stitching will
be the result. If the tension on the upper thread is greater than that on the
lower thread, it will lie straight along the upper surface of the fabric. If the
tension on the lower thread is greater than that on the upper thread, the
lower thread will lie straight along the underside of the fabric.
A. TENSION OF THE UPPER (NEEDLE) THREAD
See Fig. (5)
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Before adjusting the tension of the upper (needle) thread, be certain that
the presser foot is let down and not in lifted position. Turn serrated nut (1)
Fig. (5) on tension device to the right to increase tension and to the left if
you desire to decrease it.
B. TENSION OF THE LOWER (BOBBIN) THREAD
See Fig. (6)
The lower (bobbin) thread tension js controlled by the screw (1), Fig. (6)
near the center of the spring at the outside of the bobbin case. Turning
this screw clockwise will increase the thread tension, while turning it to the
left or counterclockwise will decrease it.
ADJUSTING THE STITCH LENGTH
See Fig. (7)
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The stitch length is Changed by pressing down the button (1), Fig. (7) in
the bed plate of the machine and by simultaneously turning the handwheel
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slowly toward you. In due course the plunger will enter into a notch in
the feeding mechanism. Hold the plunger down and continue to turn the
handwheel, either forward or rearward, until the marking with the desired
number of stitches on the handwheel coincides with the reference mark (2)
ON arm.
TO DO TACKING AND TO REVERSE DIRECTION OF FEED
(MODEL 256 ONLY)
See Fig. (8)
Fig. 8
To do tacking for the purpose of locking the ends of seams, rapidly depress
and release lever (1), Fig. (8), as the needle approaches the edge of the
material. When reversing feed of the machine, keep the lever (1) depressed
as long as required. For all other forward sewing, the lever (1) remains in
UP position.
ADJUSTING PRESSURE OF THE PRESSER FOOT
See Fig. (9)
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Pressure on the presser foot can be regulated by turning the screw (1)
Fig. (9) at the rear of the arm. Turn the screw clockwise to increase pres-
sure, and counterclockwise to decrease pressure. Use lighter pressure for
sewing thinner materials, and heavier pressure for sewing thicker fabrics
LUBRICATION
See Fig. (10), (11) and (12)
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Fig. 12
Do not operate the machine, even if only for testing, unless it has been
properly oiled at every spot requiring lubrication. The arrows in Figs. (10)
and (11) indicate the spots. Qiling must be done at least twice daily when
the machine is in continuous operation to assure free running and durability
of the operating parts. |
NOTE:
During the breaking-in period, a new machine should be oiled more
frequently.
To fill oil reservoir on top of arm, pour oil through the oil filler hole (1),
Fig. (10) until oil lever reaches the level marked on the oil gauge (2).
The hook mechanism should receive careful attention when lubricating the
machine. Push open the right hand cover plate in the bed and remove the
oil dip stick (1), Fig. (12). Fill oil in the reservoir for rotating hook mechanism
up to the level marked on the oil dip stick.
SAFETY CLUTCH
Sec Fig. (13)
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The sewing hook and its mechanism are protected by a safety clutch. In
case the hook gets jammed with thread or other foreign matter, the safety
device disengages the driving belt, stops sewing, and thus prevents the
machine from getting damaged.
If it should become necessary to re-engage the safety clutch, depress but-
ton (1) in the bed plate of the machine nearest to the arm, Fig. (13). At
the same time, turn handwheel away from you until the locking mechanism
re-engages the drive shaft beneath the bed of the machine, open slide plate
above hook and rock handwheel back and forth to remove any foreign
matter which may have lodged in the hook. Do not use any sharp-edged
tools, etc. lest the hook be damaged.
INFORMATION FOR ADJUSTMENT
TIMING SEWING HOOK WITH NEEDLE
See Fig. (14)
1/16” (1.6 m.m.)
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The point of the hook rotates past the needle in a definite timed relation-
ship. The following guidelines are offered to get correct timing between
the needle and the hook:
1. When the needle is raised 3/32” (2.5mm) from the lowest point of its
travel, the point of the hook should be at the center of the needle eye.
2. In this position, adjust the height of the needie by loosening the set
screw of the needle bar bracket so that the point of the hook is 1/16’ (1.6
mm) above the upper end of the needle eye.
3. Adjust the lateral position of the hook so that the clearance between
the needle surface and the point of hook is of the order of the thickness of
a post card.
RELATIVE POSITION BETWEEN BOBBIN CASE AND OPENER
See Fig. (15)
Post card thickness
Fig. 15
The following suggestions are offered to get correct timing between the
bobbin case and the opener:
1. Turn handwheel until the opener holder is located at the extreme right
hand position of its travel.
2. In this position, the clearance between the inside edge of the opener
and the tab (1) Fig. (15) on the bobbin case holder has to be of the order
of the thickness of a post card.
3. Adjust the clearance by loosening the opener holder screw (2).
9
ADJUSTING LIFT OF THE ALTERNATING PRESSER FEET
See Fig. (16)
The thickness of the material sewn should control the height of lift of the
alternating presser feet. It should normally be just enough for clearance of
the material. With normal adjustment both feet lift to equal height. How-
ever, some materials may require unequal height of lift.
To alter lift, loosen wing nut (1) Fig. (16) and move the link and stud
assembly (2) along the slot (3)--move up to raise the feeding presser foot
and push down to lower this foot.
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