Singer 270-37 User manual

rs
Form 21290
(264)
SINGER
Service Manual
270-37
THE SINGER COMPANY
Copyright © 1964 by The Singer Company
Copyright Under international Copyright Union
All Rights Reserved under Inter-Americon Copyright Union
*A Trademark of THE SINGER COMPANY
-fe'.
Printed In U. S. A.
From the library of: Superior Sewing Machine & Supply LLC

CONTENTS
Page
DESCRIPTION 3
INSTALLATION 4
LUBRICATION 5
OPERATOR INFORMATION 3-7
MACHINE ADJUSTMENTS 8-25
PARTS CHART 26
Page
Adjustment Sequence 8
Adjustments on Underside of
Throat Plate 23-25
Loop Pick-up Finger 24
Reel Holder Position Stop 23
Trimming Knives 23, 24
Description of Mochine 3
General Characteristics 3
Feed Mechanism Adjustments 14-17
Driving Gears 14
Lateral Linkage 14, 15
Longitudinal Linkage 16, 17
Timing Lateral Feed 17
Timing Longitudinal Feed 17
Installation 4
Knife Actuating and Clamp
Lifting Adjustments 12, 13
Button Clamp Foot Lifter 13
Pull-oft Loop 13
Safety Devices 12
Tension Releaser 13
Thread Wiper 13
Lubrication 5
Doily Care 5
Needle 6
Setting the Needle. 6
Stitching Troubles 6
INDEX
Page
Sewing Difficulties 7
Sewing Mechanism Adjustments 19, 20
Needle Bar Height 20
Hook Positioning (Longitudinal) 19
Hook Timing 19
Sewing Reel 25
Speed 5
Stop
Motion Adjustments 9-11
Arm Shaft .9
Engaging Arm 10
Starting Lever 9
Starting Lever Arm Stop 10
Tripping Linkage 11
Stop Motion Broke 18
Threading the Machine 6
Thread Stripper and
Retracting Adjustments 22
Finger
Plate Follower 22
Retracting Finger 22
Stripper Finger 22
Thread Tension Adjustments 7
Tripping Points Adjustments 18
Winding Linkage Adjustments 20, 21
Pre-T ension 21
Reel Driver Tripping Points 21
Thread Clomping Action 20
TO ALL WHOM IT MAY CONCERN:
The improper placing or renewal of the Trodemork SINGER' or any
other of the Trademorks of The Singer Company (all of which ore duly
Registered Trademarks) on ony machine that has been repaired, rebuilt,
reconditioned, or altered in any vroy whatsoever outside aSINGER
factory or an authorized SINGER agency is forbidden.
n
From the library of: Superior Sewing Machine & Supply LLC

DESCRIPTION
Machine 270-37 is a single needle, single thread, lockstitch machine designed for sewing
two and four hole buttons on clothing. The machine sews a single row of stitches parallel to
the cylinder when sewing two hole buttons and two rows of stitches parallel to the cylinder
with two right angle cross-over stitches when sewing four hole buttons.
Automatic in operation, the machine is equipped with a sewing reel which is located inside
the hook body. Thread is wound on reel from upper thread supply during the Initial needle pene
tration. Then,without a break in thread or interruption in machine cycle, stitch formation begins.
Reel thread is passed through upper thread loop on each successive stitch to form aregular
lockstitch. Thus only one thread is required to form a complete stitch pattern and no stitch
starting ends of thread are present. At the end of the stitching pattern, thread is trimmed and
excess thread is removed from reel and drawn away by a suction type air pump.
GENERAL CHARACTERISTICS
18 Stitches ... 6parallel, 2cross-over, 6parallel,
4tying.
Rotating Hook with Thread Reel . . . makes two
revolutions to each revolution of arm shaft.
Rotary Hook Shaft, , . driven by spiral bevel gear
from vertical arm shaft.
Throat Plate . . . equipped with scissor type trim
ming mechanism for cutting thread at completion of
stitch pattern.
Button Clomp . . , accommodates 14 to 50 ligne
buttons.
Work Plate ... if specified, at additional cost.
Feed Cam . . . controls operation of button clamp.
Safety Interlock . . . prevents clamp from being
lifted when machine is in operation.
Belt Guard . . . fully encloses driving belt and
stop motion device.
TENSION
REGULATOR
PRE-TENSION
PULL-OFF
LOOP
THREAD GUIDE
RING
FACE PLATE
THROAT PLATE
ROTATING HOOK
WITH REEL
CYLINDER
COVER
\
BUTTON
CLAMP
r.
ARM COVER
(SIDE)
BELT GUARD
COVER
FEED CAM
From the library of: Superior Sewing Machine & Supply LLC

BELT GUARD
COVER
HIHGE PINS
HINGE
PLATES
BRACKET
ADJUSTABLE
YOKES
INSTALLATION
GUSH ONS
Fig. 3. Installation of Machine
r
(Co
Place machine into recess on table top on four
rubber cushions at corners of drip pan as shown.
Hinge pins fit into hinge plates at back of recess
and should not support machine except when it is
tilted back.
Install blower unit in accordancewith instructions
(Form 21207) included in shipping carton.
Attach adjustable yokes to machine levers as
shown in Fig. 4.
Fig. 4. Attaching Yokes to Levers
Belt guard cover fits into bracket and encloses
drive and stop motion mechanism (see Fig. 3).
From the library of: Superior Sewing Machine & Supply LLC

LUBRICATION
For best results, use SINGER* Oil "Type B"
or
"Type D". "Type D" Oil Is used when on oil
is desired which will produce a minimum of stain
on fabric.
Doily Core
Before starting machine, apply a few drops of
oil to each of the holes indicated in Figs. 5 end 6
and run machine for a short time.
OIL
OIL
OIL OIL
OIL
OIL
On new machines and machines Installed after
several weeks of idleness, needle bar and take-up
linkage should be oiled by hand before using. The
residual lubricant may have congealed or dis
appeared entirely.
NOTE: Once each year, machine pulley (loose)
should be removed and repacked with ball bearing
lubricant.
OIL
OIL
Fig. 5. Lubricating the Machine
Cl eaning
Remove all lint and abrasive matter from around
hook body and throat plate mechanism (see Fig. 6).
Wipe off all excess oil which may come in con
tact with material to be sewn.
Machines not in use should be kept well oiled,
clean, dry and covered.
Check waste collector daily and empty when full.
SPEED
The maximum speed recommended for Machine
270-37 is 1,850 R. P.
M.
WASTE THREAD
COLLECTOR
CLEAN THESE
AREAS OFTEN
OIL
(SMALL AMOUNT)
1
Fig. 6. Cleaning the Machine
From the library of: Superior Sewing Machine & Supply LLC

NEEDLES
Use SINGER* needle — Catalog 2173.
Other needles, determined by size of thread and type of material to be sewn,are available.
LONG GROOVE
NEEDLE
CLAMPING
SCREW
Fig. 7. Setting the Needle
SETTING THE NEEDLE
With machine in "stop" position loosen needle
clamping screw shown in Fig. 7.
Insert needle up into needle bar as far as it will
go making certain that the single continuous groove
of the needle faces away from the hook (facing
the operator) as shown.
Securely tighten needle clamping screw.
THREAD
CUTTER
Stitching Troubles
Check needle often to make sure these defects
are not present.
• Wrong needle for thread and material in use • - -
a cause of thread breakage.
• Bent needle, clogged needle eye or dirty needle
groove - - - a cause of skipped stitches.
THREADING THE MACHINE
The correct threading proceedure for Machine
270-37 is shown in Fig. 8.
Thread passes through needle eye from front to
rear.
Draw thread up into cutter in face plate and
snip thread end off as shown.
Fig. 8. Threading the Machine
From the library of: Superior Sewing Machine & Supply LLC

THREAD TENSION
Needle Thread Tension
Tension should be as light as possible while
still sufficient to set the stitch correctly in material,
(see Fig. 9).
To
regulate, turn thumb nut at front of tension
discs as shown in pig. 10.
Fig. 9. EYER-LOK Stitch
Reel Thread Tension
When tension on reel thread has been correctly
adjusted, the required stitch may usually be ob
tained to suit the work in process thereafter by
varying needle thread tension only.
To regulate, turn adjusting screw shown in pig.
10 as required.
DECREASE
INCREASE DECREASE
INCREASE
0
Fig, 10. Adjusting the Tension
SEWING DIFFICULTIES
WHEN THREAD BREAKS
CHECK:
Is machine threaded properly?
Is needle correctly seated in needle bar?
Is needle bent or burred?
Is thread suitoble for needle in use?
Is needle thread tension too tight?
WHEN THREAD SNAGS OR MACHINE SKIPS STITCHES
CHECK:
Is needle eye or groove dirty?
Is needle bent or burred?
Is needle size correct for operation?
Is thread suitable for material in use?
Is reel cose free of thread end?
HINTS FOR OPERATORS
WHEN OPERATING MACHINE
Be sure to depress starting pedal firmly.
Make sure that button is inserted correctly in clamp.
Make sure that needle thread is not under clamp at start of sewing cycle.
Do not depress clamp lifting pedal until machine goes in "stop".
Inspect reel thread tension for thread or lint accumulation.
From the library of: Superior Sewing Machine & Supply LLC

ADJUSTMENTS
1"he sequence of adjustments outlined on this page should be checked and
made in the order given to ovoid confusion and unnecessary repetition.
STOP MOTION ADJUSTMENTS
A. Arm Shaft
1. Adjust for end ploy
B. Starting Lever
1. Set clearance between interlocking arm and
machine pulley
2.
Adjust arm stop
C. Engaging arm
1. Adjust to obtain correct "V" belt tension
D. Tripping Linkage
1. Adjust rock shaft support for binding
2. Set clearance between bell crank and pawl
II KNIFE ACTUATING AND CLAMP LIFTING
ADJUSTMENTS
A. Safety Devices
1. Set Lifting Arm Lug
2. Adjust lifting lever pawl to clear engaging
surface on lifting lever
3. Set Clamp lifter stop
B. Tension Releaser
1. Position tension regulator
2. Set lifting link connection
3. Set lifting arm to release tension
C. Button Clamp Foot Lifter
1. Position lifter beneath arm hook
D. Thread Wiper
1. Set wiper support
2. Position wiper wire
E. Thread Pull-off Loop
1. Adjust tension on spring
III FEED MECHANISM ADJUSTMENTS
A. Feed Driving Gears
1. Check alignment of timing marks
2. Eliminate play in gears
B. Feed Linkage Adjustment
1. Center and position lateral fevd linkage
2. Increase or decrease lateral movement of
feed bar
3. Center and position longitudinal feed link
age
4. Increase or decrease longitudinal move
ment of feed bar
C. Feed Timing Adjustment
1. Time longitudinal feed movement
2. Time lateral feed movement
IV TRIPPING POINTS ADJUSTMENT
A. Set timing to actuate interlocking arm
V STOP MOTION BRAKE ADJUSTMENTS
A. Obtain brake clearance
B. Adjust brake pressure
VI SEWING MECHANISM ADJUSTMENTS
A. Sewing Hook
1. Set longitudinal position
2. Time hook
B. Needle Bar
1. Set Needle Bar Height
VII REEL WINDING ADJUSTMENTS
A. Winding Linkage
1. Adjust thread clamping action
B. Reel Driver Tripping
Points
1. Set tripping point for "full pinch
2. Adjust Extension for duration of pinch
C. Pre-Tension
1. Adjust to aid in reel winding
VIII THREAD STRIPPING AND RETRACTING
ADJUSTMENTS
A. Finger Plate Follower
1. Set to
actuate stripper finger
B. Stripper Finger
1. Adjust to remove unused reel thread
C. Retracting Finger
1. Adjust to pick up reel thread
D. Tension Releaser
1. Re-check
IX ADJUSTMENTS UNDER THROAT PLATE
A. Reel Holder Position Stop
B. Trimming Knives
1. Set movable and adjustable knives
2. Time knives
3. Adjust knife pressure
C. Loop Pick-up Finger
1. Position operating lever
2. Set loop pick-up finger
From the library of: Superior Sewing Machine & Supply LLC

STOP MOTION ADJUSTMENTS
ARM SHAFT
CHECK:
There should be a minimum of end play in the
arm shaft shown In Fig. 11.
SETTING:
Loosen set screw in bushing shown in pig. 11
and lock nut on support screw shown in pig, 12.
Pull rear bushing out (toward machine pulley)
by turning support screw in clockwise direction.
Then tighten set screw and lock nut securely.
Check adjustment to make sure end play has been
eliminated without binding.
STARTING LEVER
CHECK:
Depress starting lever to engage machine in
"run**position.
Turn machine pulley over toward right (looking
from face plate back) until bell crank pawl moves
into the "'coast" position in bell crank as shown
in Pig. 13.
At this position, there should be approximately
1/32 inch clearance between high point of
camming
surface on machine pulley and interlocking arm as
shown in Pig. 12.
SETTING:
Loosen lock nut on starting rod and remove hinge
screw shown in Pig. 11.
Turn swivel on starting rod, (Fig. 11) in or out
one full turn for each 1/32 inch of adjustment re
quired to obtain clearance between camming surface
and interlocking arm
as shown in Pig. 12.
Replace hinge screw and tighten lock nut on
swivel securely.
HINGE
SCREW
Fig, 11. Stop Motion Adjustment (Left View)
1/32 INCH
LOCK NUT
SUPPORT
SCREW
BUSHING
ARM
SHAFT
! ^ 1
I / I "I I
5L-- —L— '''/-"j l'''U— n__
iHJ-UihnJi
SET SCREW
LOCK NUT
SWIVEL
^.J
Fig. 12. Stop Motion Adjustment (Right View)
PAWL IN COAST
POSITION
RUN POSITION
COAST POSITION
Fig. 13. Bell Crank in "Coast" Position
From the library of: Superior Sewing Machine & Supply LLC

1/32 INCH
ARM STOP
SCREW
STARTING
LEVER
Fig. 14. Adjusting the Arm Stop
"V" BELT
1/32 INCH
1/32 INCH
ENGAGING
ARM
PINCH
SCREW
Fig. 15. Setting the Engaging Arm
10
STARTING LEVER ARM STOP
CHECK;
Starting lever arm stop, Fig. 14, should limit
dov/nward movement of starting lever so that bell
crank
has 1/32 inch clearance past "run" notch
when starting lever is depressed.
SETTING:
Remove "V" belt and turn stop screw to limit
downward movement of starting lever arm as required.
Replace "V" belt and check adjustment.
ENGAGING ARM
CHECK:
Engaging arm should be adjusted so the "V"
belt drops approximately 1/32 inch when machine
moves from
"run" position to "stop" position (See
Fig. 15).
SETTING:
Loosen pinch screw. Fig. 15, and position en
gaging arm closer to or farther from starting cop as
shown.
Tighten pinch screw securely and check adjust
ment,
NOTE: Check TENSION on "V" BELT. Excessive
tightness will not improve performance of machine
but MAY CAUSE DAMAGE or excessive wear to
machine parts.
Tension on "V" belt may be varied by raising or
lowering motor, but adjustment should be made in
connection with engaging arm adjustment described
above.
From the library of: Superior Sewing Machine & Supply LLC

PAWL SHOULD LIFT
FROM NOTCHES
i-
i;0| ! y
L -'J !: \K
ROCK SHAFT
PINCH SCREW
r'^>
TRIPPING
SUPPORT
SET SCREW
;
CONNECTING ROD
SWING WRENCH
FORWARD
Fig. 16. Adjusting the Tripping Linkage
TRIPPING LINKAGE
CHECK:
Tripping rock shaft support, Fig. 16, should be
positioned to hold rock shaft without binding.
SETTING:
Loosen set screw shown in Fig. 16 and position
support as required.
Tighten set screw and check for binding.
ROCK
SHAFT
LEVER
TRIPPING
POINT
Fig. 17. Lever resting on Tripping Point
n
CHECK:
Turn machine pulley over toward operator until
rock shaft lever rests on tripping point as shown in
Fig. 17.
At this position, bell crank pawl should lift out
of notches in bell crank far enough for machine to
move into "stop" when actuated by tripping point on
feed cam as shown in Fig. 17.
SETTING:
With rock shaft lever resting on tripping point,
loosen rock shaft pinch screw with socket wrench as
shown in Fig. 16.
Using socket wrench as alever, in pinch screw,
swing wrench forward (toward face plate) to remove
play in connecting rod and ALSO to raise point of
bell crank pawl approximately .020 inch above top of
"coast" notch in bell crank as shown in Fig. 16.
Securely tighten pinch screw and check adjustment.
From the library of: Superior Sewing Machine & Supply LLC

KNIFE ACTUATING AND CLAMP LIFTING ADJUSTMENTS
KNIFE ROLLER
Fig. 18. Knife Roller positioned in Com Path
ADJUSTING PIN
(ECCENTRIC)
LIFTING
LUG
PAWL SHOULD
CLEAR
ENGAGING
SURFACE
LIFTING ARM
SET SCREW
BELL
CRANK
DRIVING LEVER
PINCH SCREW
INTERLOCKING
ARM
1
NOTCH
LIFT UP ON
DRIVEN ARM
Fig. 19. Adjusting the Safety Devices
12
SAFETY DEVICES
CHECK:
The safety interlock should prevent the button
clamp from being lifted when machine is in operation
and should prevent machine from starting when button
clamp is raised.
SETTING:
Engage machine in "run" position and turn ma
chine pulley over toward right until knife roller is
at extreme outward position on feed cam as shown in
Fig. 18.
Loosen driving lever pinch screw, Fig. 19 and
lift up on driven arm with screwdriver to bring lifting
lug
against back of bell crank as shown.
Maintain this position while tightening pinch
screw securely.
Then rotate machine pulley again until the point
is reached just before interlocking arm drops into
notch on pulley
("stop" position).
Set adjusting pin (eccentric), while depressing
clamp lifting lever arm, so that pawl on lifting arm
does not engage driven arm and slides by as shown
in
inset, Fig. 19.
Then
rotate machine pulley to bring machine into
"stop" position and adjust the clamp lifter stop
shown in Fig. 20 by means of adjusting nuts. The
stop should be set to limit extreme downward move
ment of lever arm and thereby avoid binding of starting
lever rock shaft when clamp lifter is
activated before
machines goes into "stop" position.
ADJUSTING NUTS
CLAMP LIFTER
STOP
Fig. 20. Setting the Clomp Lifter Stop
From the library of: Superior Sewing Machine & Supply LLC

TENSION RELEASER
CHECK;
When button clamp is raised, the first upward
movement of the lifting bar, Fig. 21, should separate
the tension discs and release tension on needle
thread.
SETTING:
To adjust the tension release, first loosen the
set screw in casting below tension regulator, Fig. 21,
and move entire regulator all the way in. Tighten
set screw.
Then loosen the screw in lifting link connection
and set lifting link so that it projects approximately
1/32 inch as shown. Tighten screw.
Next, loosen the pinch screw in lifting arm (see
inset) and push up on lifting bar until tension discs
just begin to release. Maintain this position while
tightening pinch screw.
MAKE CERTAIN that lifting
arm is against shoulder on rock shaft.
BUTTON CLAMP FOOT LIFTER
SETTING:
Loosen lifting bar clamp screw. Fig. 22, and
position foot lifter approximately
1/8 inch below
arm hook as shown. Then tighten clamp screw.
THREAD WIPER
SETTING:
Loosen wiper support screw. Fig. 22, and posi
tion wiper support so that slot in body finger is
horizontal. Tighten wiper support screw.
Position wiper wire to clear needle by approx-
mately 1/16 inch.
THREAD PULL-OFF LOOP
CHECK:
The pull-off loop should draw sufficient thread
from the unwinder to complete the stitch pattern.
Also, pull-off loop should not "whip" and may be
controlled by increasing or decreasing tension on
spring.
SETTING:
Loosen the four bracket set screws shown in
Fig. 23 and position the pull-off loop as close as
possible to machine arm without touching. Tighten
bracket set screws. Then loosen collar set screw
and move collar to increase or decrease tension as
required. Tighten collar set screw.
13
LIFTING LINK
SCREW
1/32 INCH
LIFTING BAR' ^
Fig. 21. Adjusting the Tension Releaser
§
SUPPORT
SCREW —\ ^
LIFTING BAR
CLAMP SCREW
SLOT
1/16 INCH
TENSION DISCS
SET SCREW
PINCH SCREW
1/8 INCH
FOOT LIFTER
WIPER WIRE
Fig. 22. Adjusting the Foot Lifter
PULL-OFF LOOP
COLLAR SET
SCREW
BRACKET SET
SCREWS
Fig. 23. Setting the Poll-off Loop
From the library of: Superior Sewing Machine & Supply LLC

FEED MECHANISM ADJUSTMENTS
SUPPORTING
GEAR SCREW
TIMING MARKS
ALIGNED
Fig. 24. Alignment of Timing Marks
WORM GEAR
WORM
SHOULD BE EQUALLY
ACCESSIBLE
Fig. 25. Adjusting the Feed Driving Gears
14
FEED DRIVING GEARS
CHECK:
Com supporting gear and vertical shaft pinion
gear are positioned at factory so that timing marks
shown in Fig. 24 will be aligned when machine is
in
"stop" position.
SETTING:
Remove excessive play between worm gear and
worm by loosening two screws in worm
(see inset
Fig. 25) and moving worm forward on shaft.
When the worm gear is properly assembled on
vertical shaft, the spot and set screws shown should
be equally accessible through side opening in arm
casting.
Insure minimum play between vertical shaft
pinion gear and cam supporting gear by loosening
socket head screw inside supporting gear screw as
shown in Fig. 24.
By means of "hex" head on supporting gear
screw, turn the bracket (which is eccentric) until
only minimum amount of play
exists between gears.
Then tighten socket head screw inside supporting
gear screw.
FEED LINKAGES
NOTE: Adjust lateral and longitudinal feed linkages
when changing from two or from four hole buttons
or when changing the hole spacing in the button.
LATERAL FEED LINKAGE
CHECK:
Lateral feed linkage should be adjusted so that
feed plate moves the same distance on one side of
needle hole in throat plate as it moves on the other
side. Then, lateral feed linkage should be adjusted
to increase or
decrease the distance feed plate
moves on both sides of needle hole.
NOTE: Hole in feed plate does not necessarily
have to be centralized to obtain the above setting.
From the library of: Superior Sewing Machine & Supply LLC

SETTING 1: (To obtain equal distance)
Remove cylinder arm cover and vertical arm
cover (See Fig. 27).
Insert button to be sewn into clamp, engage
machine into "run" position and rotate machine
pulley until needle is just above button (See Fig. 26).
Loosen clamp
screws A and B, Fig. 27,and move
feed plate so that button is centered laterally (across
cylinder) as shown in inset Fig. 27.
At
this position, lateral rock shaft driving arm
and driven arm should be parallel as shown in inset,
Fig. 27. If necessary, move linkage as required to
obtain
this position. Then securely tighten screw A.
Next, obtain correct position of
needle in re
lation to holes in button by turning machine pulley
and moving feed plate to bring needle into right
rear hole of button. Then tighten screw B.
SETTING 2: (To increase or decrease distance)
Loosen lateral driving arm stud nut as shown
in inset. Fig. 27.
BUTTON CENTERED
LATERALLY
CLAMP SCREW B
DRIVING ARM
11^ ninpfi inirnrn im.
Fig. 26. Needle positioned above Button
When
sewing two hole buttons, move stud toward
rear of machine allowing feed bar positioner to reg
ister over lateral rock shaft.
When sewing four hole buttons or changing the
hole spacing, move stud toward front of machine as
required to obtain the desired distance between holes.
When adjustment is obtained, securely tighten
stud nut, replace arm cover and adjust longitudinal
setting.
FEED BAR
POSITIONER
RIVEN
CLAMP
SCREW A
ARMS SHOULD
BE PARALLEL
STUD NUT
CYLINDER ARM
COVER
VERTICAL ARM
COVER
Fig. 27. Adjusting Lateral Feed Linkage
15
From the library of: Superior Sewing Machine & Supply LLC

Fig. 28. Needle positioned above button
BUTTON CENTERED LONGITUDINALLY
DRIVEN ARM
SCREW C
SCREW D
DRIVING ARM
Fig. 29. Adjusting Longitudinal Feed Linkage
16
LONGITUDINAL FEED LINKAGE
CHECK:
Longitudinal feed linkage should be adjusted so
that feed plate moves ihe same distance forward
from needle hole in throat plate as it moves back
ward. Then, longitudinal feed linkage should be
adjusted to increase or decrease the distance feed
plate moves forward and backward.
LONGITUDINAL FEED LINKAGE
SETTING 1: (To obtain equal distance)
Insert button to be sewn into clamp, engage ma
chine into "run" position and rotate machine pulley
until needle is just above button (see Fig. 28).
Loosen screws C and D shown in Fig. 29 and
move feed plate so that button is centered longitudi
nally (along the bed) under the needle as shown.
At this position, longitudinal rock shaft driving
arm and driven arm should be parallel as shown in
Fig. 30. If necessary, move linkage as required to
obtain this position. Then securely tighten screw C.
DRIVING ARM
ARMS SHOULD
BE PARALLEL
STUD NUT
DRIVEN ARM
Fig. 30. Driving Arm parailel with Driven Arm
rN
From the library of: Superior Sewing Machine & Supply LLC

Next, obtain correct position of needle in re
lation to holes in button by turning machine pulley
and moving feed plate to bring needle into right
rear hole of button. Then tighten screw D.
SETTING 2: (To increase or decrease distance)
Loosen longitudinal driving arm stud nut shown
in Fig. 30.
Move stud toward left or right as required to
obtain the desired distance between holes in button.
When adjustment is obtained, securely tighten
stud nut.
TIMING THE FEED
NOTE: Longitudinal feed timing should be set before
making any lateral timing adjustment.
CHECK:
Feed bar shown in Fig. 31 should be stopped
before needle enters the button and should not begin
to move until the needle leaves the button.
LONGITUDINAL SETTING:
Longitudinal feed movement is timed by loosening
the three cam mounting screws shown in Fig. 32
and rotating the cam toward left (as viewed
from the
bottom of machine) to speed up the longitudinal
feed in relation to needle movement, or toward right
to slow down the feed in relation to needle movement.
When adjustment is correctly set, securely tighten
three cam mounting screws.
LATERAL SETTING:
Lateral feed movement is timed by loosening the
stud nut on lateral rock shaft roller shown in Fig.
33 and moving roller to the left (as viewed from top)
to slow down the lateral feed in relation to needle
movement or toward right to speed up the feed in
relation to needle movement.
When adjustment is correctly set, securely tighten
stud nut.
17
BAR
Fig. 31. Loterol and Longitudinal Feed Linkage
CAM MOUNTING
SCREWS
SLOW DOWN
Fig. 32. Timing Longitudinal Feed
STUD NUT
SLOW DOWN
SPEED UP
Fig. 33. Timing Laterol Feed
From the library of: Superior Sewing Machine & Supply LLC

STOP MOTION TRIPPING POINTS
TRIPPING
POINT
SCREWS
LATER
SOONER
Fig. 34. Adjusting the Tripping Points
TIMING
CHECK;
Tripping points on underside of cam should be
set so that interloclcing arm drops back on to camming
surface of machine pulley (tight)
as soon as notch,
on machine pulley, passes interlocking arm.
SETTING:
With machine tilted back on its hinges, loosen
the two tripping point screws shown in Fig. 34 and
move tripping point to the right to
set trip off sooner
or left to
set trip oft later. Securely tighten tripping
point screws.
STOP MOTION BRAKE
CLEARANCE
CHECK:
There should be approximately 1/32 inch clear
ance between brake shoe and machine pulley (tight)
when machine is in run position (See Fig. 35).
ECCENTRIC STUD
ADJUSTING
SCREW
BRAKE SHOE
1/32 INCH
SET SCREW
PINCH SCREW
Fig. 35. Adjusting the Stop Motion Brake
18
SETTING:
Engage machine in run position and loosen the
set screw shown in Fig. 35.
Turn eccentric stud until brake shoe clears
machine pulley by approximately 1/32 inch. Then
tighten set screw.
PRESSURE
CHECK:
Brake pressure should be regulated to prevent
machine from going into "stop" too hard to avoid
damage to machine
parts.
When checking brake pressure, machine speed
and thickness of material to be sewn have a definite
relation to the amount of pressure required.
SETTING:
Loosen pinch screw shown in Fig. 35 and turn
adjusting screw inward for more pressure or outward
for less pressure. Then tighten pinch screw securely.
NOTE: Check stop motion brake adjustment about
once a month. Loss of braking power due to wear or
glazing of braking surfaces may be compensated
for byre-adjusting for correct clearance and pressure.
From the library of: Superior Sewing Machine & Supply LLC

SEWING MECHANISM ADJUSTMENTS
INCH
zsz.:.-:::
BEVEL GEAR
SET SCREWS
Fig. 36. Adjusting the Sewing Mechanism
LONGITUDINAL POSITION OF HOOK
CHECK:
With hook body firmly seated against front bush
ing, and hook point at center of needle, the
distance
between hook point and needle should be from .002
to .010 inch (See Fig. 36).
SETTING:
Loosen two bevel gear set screws and front
bushing
set screw as shown in Figs. 36 and 37.
With hook body
seated against front bushing,
turn adjusting pin
as required to obtain .002 to .010
inch
clearance. Securely tighten front bushing set
screw.
Maintain relationship of hook point with center
of needle and tighten two bevel gear set screws.
HOOK TIMING (Radial Position)
CHECK:
Loop taking occurs when needle bar has risen
.100 inch from bottom dead center position. At this
position, hook point should be at centerline of
needle as shown in Fig. 38.
NOTE: A gauge for positioning needle .KX) inch
from bottom dead center position is available upon
specific request at additional charge.
SETTING:
Loosen two hook body screws shown in Fig. 37.
With needle set for .100 inch above bottom dead
center, move hook body as required to position
point of hook at centerline of needle. Securely tighten
two hook body screws.
19
FRONT BUSHING
SET SCREW
iZZZZZZZZZZ
HOOK BODY ADJUSTING PIN
SCREWS
Fig. 37. Setting Longitudinal Position of Hook
HOOK POINT AT
CENTER OF NEEDLE \
mznimzsM
wmmnzm
Fig. 38. Timing the Hook
From the library of: Superior Sewing Machine & Supply LLC

HOOK POINT AT
TOP OF NEEDLE EYE
PINCH SCREW
Fig. 39. Setting the Needle Bar Height
NEEDLE BAR HEIGHT
CHECK:
Needle bar height should be set so that hook
point is at top of needle eye at loop taking (see
Fig. 39).
SETTING:
With point of hook at centerline of needle, re
move face plate and loosen needle bar pinch screw
shown in Fig. 39.
Raise or lower needle bar as required to position
hook point at top of needle eye. Securely tighten
needle bar pinch screw and replace face plate.
NOTE: A gauge for setting
needle bar height is
available upon specific request at additional charge.
REEL WINDING ADJUSTMENTS
Inset A
TRIPPING
POINT
Inset B
PUSH ROD KNURLED LEVER ARM
SPRING NUT. PINCH SCREW
CONNECTION LOCK
SPRING SCREW
Fig. 40. Adjusting the Winding Linkage
20
WINDING LINKAGE
CHECK:
Reel winding linkage should be set to clomp the
needle thread in throat of hook body as shown in
inset A, Fig. 40.
SETTING:
Remove cylinder arm cover and turn machine pulley
until tripping lever
rests on tripping point as shown
in
inset B, Fig. 40. Then loosen lever arm pinch
screw and lock screw on knurled nut as shown. Make
certain that tripping lever remains IN CONTACT
with tripping point on feed cam.
Back off on knurled nut one full turn from fully
engaged position and compress push rod spring by
pushing in on lever arm until heavier bias of connec
tion spring is felt. Hold this position while tightening
lever arm pinch screw.
Adjust for POSITIVE CLAMPING ACTION of
restricting spring by turning knurled nut as required.
Then tighten lock screw on knurled nut and replace
cyl inder arm cover.
From the library of: Superior Sewing Machine & Supply LLC