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
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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
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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
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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
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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
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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