SINGER 29K73 User Manual

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Parts List

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THE SINGER MANUFACTURING COMPANY

USE SINGER" OILS

and LUBRICANTS

They insure freedom from lubricating trouble and give

longer life to sewing equipment

The following are the correct lubricants for this machine:

TYPE B — MANUFACTURING MACHINE OIL, HEAVY GRADE

When an oil is desired which will produce a minimum of

stain on fabrics, even after a long period of storage, use:

TYPE D — MANUFACTURING MACHINE OIL, HEAVY GRADE

OTHER SINGER LUBRICANTS

TYPE E —THREAD LUBRICANT

For lubricating the needle thread of sewing machines for stitching fabrics or leather where a thread lubricant is required.

TYPE F-MOTOR OIL

For oil lubricated motors and plain bearings in power tables and transmitters.

NOTE: All of the above oils are available in 1 quart, 1 gallon and 5 gallon cans.

GEAR LUBRICANT

This specially prepared grease is recommended for gear lubrication on manufacturing sewing machines.

BALL BEARING LUBRICANT

This pure grease is specially designed for the lubrication of ball bearings and ball thrust bearings of motors and electric transmitters, ball bearing hangers of power tables,

etc. Furnished in 1 lb. and 4 lb. tins.

Form 20870 (957)

Printed in U.S.A.

SERVICE MANUAL

AND

PARTS LIST

FOR

SINGER

29K71, 29K72 and 29K73

UNIVERSAL UPPER FEED MACHINES

SINGLE NEEDLE LOCK STITCH

THE SINGER MANUFACTURING COMPANY

*A Trademark of THE SiNGER MANUFACTURING COMPANY

FOREWORD

This book contains complete information covering operation, adjustment,

and parts list, for Machines 29K71, 29K72 and 29K73. Descriptions and exploded

viev/s of all parts assemblies on pages 17 to 44 inclusive, v/ill be found helpful

when ordering any part of the machine requiring renewal.

DESCRIPTION

Machines 29K71, 29K72 and 29K73, for stitching boots, shoes, and other tubular work in leather and

fabrics, have the following characteristics:

Single Needle, Lock Stitch. Stop Motion Hand Wheel—releases hand wheel from stitching mechanism for bobbin winding. Horizontal Oscillating Shuttle. Eccentric Adjustment for Shuttle Timing. Cylinder Bed. Replaceable Steel Horn. Universal Upper Feed for Stitching in any direction without turning the work. Stitch Length: 7 to 1 5 to the inch, depending on material being stitched and operations performed.

Presser Foot rise during feeding action; 1/4 inch — (Maximum clearance: 3/8 inch).

Double End Needle Plate — (two sizes of needle holes at each end for various sizes of needles).

Adjustable Thread Take-up Lever.

Two Speed Machine Pulley.

ACCESSORIES AVAILABLE UPON ORDER

(at additional charge)

Attachment for fitting Hand Wheel on front of machine (Part No. 82121).

Stand for mounting the machine

Detachable Work Table for flat stitching operations (Part No. 83739, 83740, or 83741). Electric Transmitter S-9.

601405 or 601407 for foot power.

^601406 or 601 408 for elfectric power.

SPECIAL FEATURES

MACHINE 29K71

End of cylinder bed is 1 inch wide and 7/8 inch deep. Space at right of needle 12-1/4 inches. Diameters of belt grooves 2-7/8 inches and 4-7/8 inches.

MACHINE 29K72

End of cylinder bed is 1 -5/32 inches wide and 1-1/16 inches deep.

Space at right of needle 17-1/2 inches.

Diameters of belt grooves 3-1/4 inches and 5-1/2 inches.

Large Bobbin.

MACHINE 29K73

End of cylinder bed is 1 inch wide and 7/8 inch deep.

Space at right of needle 17-1/2 inches.

Diameters of belt grooves 3-1/4 inches and 5-1/2 inches.

SPEED

The maximum speed recommended for these ma chines is 500 stitches per minute, depending on ma terial being stitched and operations performed.

For thick work, patching, mending, and stitching elastics, put the driving belt on the larger pulley of the machine and the smaller pulley of the stand.

For light work, put the belt on smaller pulley of the machine and the larger pulley of the stand.

When in operation, the hand wheel must always

turn over toward the operator (counter-clockwise).

NOTE: If fitted on front of machine, hand wheel must always turn over toward the right (clockwise).

TO OIL MACHINE

/ /

\ \

Fig. 3. Oiling Rear of Machine

Use "TYPE B" or "TYPE D" OIL, sold by Singer Sew

ing Machine Company.

See inside front cover of this book for description of

these oils.

Fig. 2. Oiling Front Side of Machine

When machine is received from the factory, it should be thoroughly cleaned and a drop of oil should be applied to all parts indicated in Figs. 2, 3 and 4.

Apply a drop of oil to the stand at the centers upon which band wheel and treadle work. Also to both ends of the pitman rod connecting the treadle with band wheel.

Run machine for a few minutes to work oil into bearings. When the machine is in constant use, it should be oiled daily.

Fig. 4. Oiling Shuttle Race

To oil shuttle race, raise needle bar to its highest

point and lift feeding foot A, Fig. 5 by moving lifter B

upward.

Press down lever C, Fig. 5 and swing needle plate

to position shown in Fig. 4.

Apply a drop of oil to the face of shuttle race and

to the hole shown by arrow in Fig. 4.

TO OPERATE THE MACHINE

NEEDLES

1. Raise feeding foot A, Fig. 5 by moving lifter B

upward.

2. Place both feet upon the treadle.

3. Turn top of hand wheel over toward you to

start machine. (If hand wheel is fitted on front of machine, turn top of hand wheel from left to right to start machine.)

4. Allow the feet to move freely with the motion

of the treadle. Continue this motion with an alternating pressure of heel and toe until a regular easy movement is acquired and the hand wheel is kept in continuous rotation by use of the feet alone.

5. When familiar with the treadle movement, and you are able to re-start the machine without turning the hand wheel in the wrong direction, place a piece of material under the feeding foot.

6. Lower feeding foot by lowering lifter and oper ate machine until you have become accustomed to guiding the material.

Material is moved along by the feeding foot only, and, the direction of stitching can be changed as de sired, by turning wings. Fig.32. To make a curved line of stitching, operate machine slowly and, without turning work, turn the revolving wings enough to pro duce the desired curve.

Feeding foot rises between each stitch while needle is in the material. With needle serving as pivot, ma terial can be turned in any direction. When desired, the feeding foot may be fixed to work in a straight line, in any direction, by tightening the knurled screw

A, Fig. 22.

Never turn the work or alter the direction of the feed while the foot is pressing on the material, as this may cause missed stitches and damage the surface of the work.

Needles for MACHINES 29K71, 29K72 and 29K73 are of Class and Variety 29 x 3 for cloth and 29 x 4 for leather. Needles 29 x 3 are made in sizes 11, 14,

16, 17, 18, 19, 21, 22, 23, 24 and 25, Needles 29 x 4 are made in sizes 9, 11, 14, 16, 18, 19, 21, 22, 23, 24 and 25.

The above needles regularly have nickel finish but

can be supplied with chromium finish if ordered.

The size of the needle to be used should be deter mined by the size of the thread which must pass freely through the eye of the needle. Rough or uneven thread, or thread which passes with difficulty through the eye of the needle will interfere with the successful use of the machine.

Orders for needles must specify the Quantity re quired, the Size number, also the Class and Variety numbers separated by an x.

The following is an example of an intelligible order:

"100 No. 16, 29 X 3 Needles", for cloth. "100 No. 16, 29 X 4 Needles", for leather.

The best stitching results will be obtained by using the needles sold by Singer Sewing Machine Company.

THREAD

Left twist thread should be used in the needle. Either right or left twist thread can be used for the bobbin.

Fig. 5. Operating Machine

To determine the twist, hold the thread as shown. Turn the thread over toward you between the thumb and forefinger of the right hand; if left twist, the strands will wind tighter. If right twist, the strands will unwind.

Fig. 6. Determining Twist of Thread

TO REMOVE THE BOBBIN

Raise needle bar to its highest point and lift feeding

foot A, Fig. 7 by moving lifter B, Fig. 5 upward.

Press down lever C, Fig. 7 and swing needle plate

around as shown.

Turn hand wheel until point of shuttle is nearest operator, then lift out shuttle with thumb and fore finger.

Turn shuttle over and bobbin will drop out.

NOTE: For 29K72 machine, move bobbin retaining spring D, Fig. 7 outward before taking out the bobbin.

¡y

Fig. 8

NOTE: If hand wheel and bobbin winder are fitted

on front of machine, the slot in the side of the bobbin must face to the outside. The top of hand wheel must then turn over to the right (clockwise) as when sewing to insure properly wound bobbins.

When bobbin is sufficiently full, remove it from the spindle. Loosen thumb screw D, Fig. 9 on the winder and move screw upward in slot until the rubber ring is out of contact with the hand wheel, then tighten thumb screw.

Fig. 7. Taking out th« Shuttle

TO WIND THE BOBBIN

Disengage hand wheel from operating stitching

mechanism by drawing out plunger F, Fig. 8 and

turning it slightly to left or right.

Place spool of thread on the spool pin and pass

end of thread through the center slot or hole in the

bobbin. Then press the bobbin, with slot in the side of the bobbin facing to the left, as far as it will go, on bobbin winder spindle.

Loosen thumb screw D, Fig. 9 on bobbin winder and push it down until the rubber ring presses against the rim of the hand wheel, then tighten screw.

Turn hand wheel over toward you as when sewing

and simultaneously guide the thread with the finger as shown in Fig. 9.

Fig. 9. Winding the Bobbin

Re-engage the hand wheel v/ith the stitching me chanism by turning plunger F, Fig. 8 slightly while simultaneously turning the hand wheel slowly until the plunger enters the hole in the inner disc.

TO THREAD THE SHUTTLE FOR 29K71 AND 29K73

Hold the bobbin between the thumb and forefinger of right hand, the slot in the edge of the bobbin being at the bottom. Allow two or three inches of thread to hang free.

Hold the shuttle in the left hand with the wide opening uppermost. Let end of thread pass 'through shuttle opening, then place bobbin into shuttle. See Fig. 10.

Fig.lO

Turn shuttle over while holding bobbin in it and draw the thread into the slot in the edge of the shuttle and under the end of the tension spring. See Fig. 11.

Fig. 11

Pass the thread through delivery eye which is in

the upper edge of the shuttle. See Fig. 12.

Fig. 12

Fig. 13

TO THREAD SHUTTLE FOR 29K72

Hold the bobbin between thumb and forefinger of

right hand with the thread leading from right to left.

Hold the shuttle in the left hand with its open end up and its retaining spring moved outward. See Fig. 13.

Place bobbin into shuttle and push back the re taining spring which will hold the bobbin in the shuttle.

With the right hand, draw the thread into the slot

in the edge of the shuttle as far as possible. See Fig. 14.

Then draw thread to the left, up, and to the right

under the spring. See Fig. 15.

Now insert end of thread up through the small hole in the edge of the shuttle and through the eye in top of the bobbin position post. See Fig. 16.

Fig. 16

TO REPLACE THE SHUTTLE

After threading the shuttle, turn hand wheel until the upright part of the shuttle carrier is to the right. Then with the point of the shuttle nearest you, and pointing towards the right, place it into the recess as shown in Fig. 17. With needle bar at its highest

point, press down lever C, Fig. 17 and swing back

needle plate to its sewing position.

TO THREAD NEEDLE

Fig. 17. Replacing Shuffle

TO SET THE NEEDLE

Raise needle bar to its highest point and loosen screw H, Fig. 18. Then insert shank of the needle up into the needle clamp as far as it will go with long groove of the needle to the left and its eye directly in line with the arm of the machine. Tighten screw Fig. 18. Loosen screw G, Fig. 18 and move the clamp to right or left until the needle passes through the center hole in the needle plate, then tighten screw G.

CAUTION: There are two double end needle plates furnished with each machine. Be certain needle is straight and corresponds to the correct needle hole size indicated on end of needle plate.

Fig. 19. Threading Needle

1. Place the spool of thread on the spool pin so that

thread will draw from the rear side of spool. See

Fig. 19.

2. Raise the wire guide in the oil cup on top of the arm and pass thread under guide 1, then press guide back into position.

3. Draw the thread around back of pin 2 which is near the tension discs on top of the arm and from back to front and right to left between the tension discs 3. See Fig. 20.

4. Pass thread through wire eyelet 4.

5. Lead thread up and from front to back through the hole 5 in the take-up lever.

6. Draw about 10 inches of thread through the hole in take-up lever and insert the end into the slit in the end of the threading wire supplied with the machine. Then pass end of threading wire down through hole needle bar.

7. Remove thread from threading wire then with draw threading wire. Pass the thread from left to right through the eye of the needle 7. Draw about three inches of thread through the eye of the needle with which to start sewing.

6 which runs through the center of the

Fig. 18. Selling the Needle

TO THREAD NEEDLE FOR DARNING

1. Place the spool of thread on the spool pin so

that thread will draw from rear side of spool.

2. Raise the wire guide in the oil cup on top of the arm and pass thread under guide 1 then press guide back into position. See Fig. 19.

3. Pass thread over the pin 2 near the tension discs in front of the arm and from right to left under and between the tension discs 3, Fig. 21.

4. Pass thread through wire eyelet 4.

5. Pass thread up and from front to back through the hole 5 in the take-up lever.

6. Draw about 10 inches of thread through the

hole in take-up lever and insert the end into the slit

in the end of the threading wire supplied with the machine. Then pass end of threading wire down through hole 6 which runs through the center of the needle bar.

Fig. 22. Drowing up Bobbin Thread

the bobbin thread; draw up the needle thread and the bobbin thread will come up with it through the hole

in the needle plate. See Fig. 22. Lay both threads back

under the feeding foot.

TO PREPARE FOR SEWING

With the left hand hold the end of the needle thread,

leaving it slack from thé hand to the needle. Turn top

of hand wheel over toward you until the needle moves

down and up again to its highest point, thus catching

NOTE: Turn top of hand wheel over toward the right (clockwise) if hand wheel is fitted on front of machine.

TO START SEWING

Place the material under the feeding foot, lower the foot and start to sew, turning the hand wheel over toward you. (Turn hand wheel to the right if located

on front of machine.)

CAUTION: Do not try to help feeding of the work by pulling the material as this may deflect the needle and cause it to break. The machine feeds the work easily without any assistance.

TO REMOVE THE WORK

Let the needle bar rest at its highest point, raise the

feeding foot, then draw the material backward about

3 inches and cut the threads close to the work. Leave the ends of the threads under the feeding foot.

TENSIONS

For perfect stitching, the tension on needle and

bobbin threads must be heavy enough to pull threads

to center of material and make a firm stitch, thus:

Fig. 23. Perfect Stitch

If the tension on the needle thread is too tight, or if that on the bobbin thread is too loose, the needle thread will lie straight along the upper surface of the material thus:

Fig. 24. Tight Neecile Thread Tension

If the tension on the bobbin thread is too tight, or

if that on the needle thread is too loose, the bobbin

thread will lie straight along the under side of the

material, thus:

BOBBIN THREAD TENSION

The tension on bobbin thread is regulated by the

screw in Figs. 27 and 28 on the end of the shuttle tension spring.

To increase bobbin thread tension, gradually tighten

screw. See Fig. 27.

To decrease bobbin thread tension, gradually loosen

screw. See Fig. 28.

When bobbin thread tension has been properly adjusted, it is seldom necessary to change it because a correct stitch can be usually obtained by varying the needle thread tension.

Fig. 27. Increasing Bobbin Thread Tension

Fig. 25. Loose Needle Thread Tension

NEEDLE THREAD TENSION

The tension on the needle thread is regulated by

the thumb nut near the tension discs. See Fig. 26.

To increase the needle thread tension, tighten thumb

nut.

To decrease the needle thread tension, loosen thumb

nut.

NOTE: Tension on needle thread can be tested only

when the feeding foot is down.

MORE TENSION

LESS TENSION

Fig. 28. Decreasing Bobbin Thread Tension

Fig.26. Regulating Needle Threod Tension

Td REGULATE THE TAKE-UP LEVER

WITH REGULATOR INDICATOR

The spring tension on take-up lever J, Fig. 29 is

adjusted by thumb nut K. The tension on this lever

should be about the same as that applied to the upper

thread by the tension discs.

When the stitch is set, at the top of the needle bar stroke, lever J should be held down far enough by the tension of the thread so that the take-up action will

keep the thread taut until the needle enters the work.

When sewing light weight materials with fine thread, more take-up action may be secured by turn

ing the thumb nut K so that it screws up to decrease the take-up spring tension. This should be done instead of tightening the thumb nut of the tension discs.

For heavier materials and thread, the take-up ten sion must be about the same as that applied to the upper thread by the tension discs.

The travel of take-up lever J is regulated by means of knurled nut L. The indicator near nut L is marked with the figures 0 to 4. This indicator provides a useful guide to the operator in setting the take-up movement most suitable for the material and thread being used.

For thin materials, such as kid or box calf, turn knurled nut L until the zero mark is opposite the small plunger U.

ADJUSTMENT OF THREAD TAKE-UP LEVER

REGULATOR INDICATOR

The range of adjustment given by the indicator, when sent out from the factory, should suffice for all general purposes, but, if desired, the range can be raised or lowered by means of the adjusting screw T, Fig. 29 at the extreme right.

To alter the range, loosen the lock nut S and, using a screwdriver, turn the center screw T to the right to

reduce the travel of the take-up lever.

To increase the travel, turn the screw T to the left. Wear at the tip of the center screw can also be taken up in this manner. When the proper adjustment has been obtained, tighten the lock nut S.

It is most important that the hexagon head nut R be securely locked against the face of the piston.

TO CHANGE LENGTH OF STITCH

Other adjustments can be made in steps by turning the nut to suit any thickness of material and thread within the capacity of the machine.

NOTE: All machines sent out from the factory are so adjusted that they will give satisfactory results on a general range of materials. Before any adjustment

is made to the travel of the take-up lever, the needle bar should be raised to its highest point.

Fig. 29. Regulating Tension and Travel of Take-up Lever

The length of stitch is regulated by the stitch regu lator which is held in position by thumb screw M, Fig. 30 at back of the feeding foot bar. Loosen thumb screw M and move the regulator up or down until its top is in line with the mark indicating desired number of stitches to the inch as shown by the arrow. Then tighten the thumb screw.

Ms.

Fig. 30. Changing Stitch Length

TO REGULATE PRESSURE ON THE MATERIAL

The pressure on the material is regulated by knurled thumb nut O, Fig. 31. To increase the pressure, tighten the thumb nut. To reduce the pressure, loosen the thumb nut.

Heavier pressure is required for leather work than

for sewing cloth or cotton materials. The pressure should be only heavy enough to enable the feed to move the work along evenly.

TO CHANGE DIRECTION OF THE FEED

While stitching, the work is moved along by the

action of the feeding foot only.

The direction of the stitching can be changed as desired by turning the foot around by means of the two handles E, Fig. 32.

Fig. 33. Changing Feed Direction

Fig. 31. Regulating Pressure on Material

TO TURN A CORNER

Stop the machine with the needle in the work and turn top of hand wheel over toward you until the feeding foot rises. Then turn the work as desired, using the needle as a pivot.

NOTE: If h and wheel is located on front of machine,

turn top of hand wheel over to the right.

TO REGULATE THE AUTOMATIC LIFT

OF THE FEEDING FOOT

While the machine is in operation, the feeding foot rises after it has moved the work forward; then the foot moves toward the needle and descends again upon the fabric. It is advisable that the lift of the foot should be only sufficient to clear the thickest part of

the work.

To adjust the lift, raise the feeding foot by means of

lifter B, Fig. 31. To increase the feeding foot lift, loosen wing screw N and move the screw toward you. To reduce the lift, move the screw away from you. When the desired height of lift is obtained, tighten the wing screw.

TO CHANGE THE NEEDLE PLATE

1. Raise the needle bar to its highest position.

2. Loosen screw Q, Fig. 33 and, by lifting upward,

remove needle plate and hinge pin P.

3. When replacing the needle plate, place flat side

of pin P toward screw Q.

4. Tighten screw Q on flat side of pin P.

,;S:

Fig.

33. Correct Position of Hinge Pin in Needle Plate

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SINGER 29K73 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual