SINGER 112 User Manual

SINGER

Instruction Manual

and

Parts List

® Singer is a registered trademark of The Singer Company Limited or its affiiiated companies.

Zigzag Sewing Machine

Instruction Manual and Parts List

Contents

1. Safety Instructions..............................................................................................................................................................4

1.1. Important Safety Instructions..................................................................................................................................4

1.2. Safe Operation......................................................................................................................................................... 5

2. Product Description and Machine Specification............................................................................................................... 6

2.1. Product Description.................................................................................................................................................6

2.2. Machine Specification..............................................................................................................................................7

2.3. Motor, Motor Pulley and V-Belt Specifications.......................................................................................................8

2.4. Relationship between Zigzag Bight and Maximum Speed......................................................................................8

3. Setup and Adjustment Instructions....................................................................................................................................9

3.1. Table Cut-Out Drawing.............................................................................................................................................9

3.2. Oil Reservoir Installation........................................................................................................................................10

3.3. Belt Cover Installation............................................................................................................................................11

3.4. Lubrication.............................................................................................................................................................11

3.5. Needle and Thread.................................................................................................................................................13

3.6. Inserting the Needle..............................................................................................................................................13

3.7. Bobbin Case Removal.............................................................................................................................................14

3.8. Bobbin Winding.................................................................................................................................................... 14

3.9. Bobbin Case Threading..........................................................................................................................................15

3.10. Bobbin Case Repiacement................................................................................................................................ 17

3.11. Machine Threading............................................................................................................................................18

3.12. Stitch Length Adjustment..................................................................................................................................19

3.13. Presser Foot Pressure Adjustment...................................................................................................................19

3.14. Needle Thread Tension Adjustment.................................................................................................................20

3.15. Take-up Spring Regulation.......................................................................‘..........................................................20

3.16. Bobbin Thread Tension Adjustment.................................................................................................................20

3.17. Needle Position Selector...................................................................................................................................21

3.18. Stitch Width Regulator......................................................................................................................................22

3.19. Zigzag Stitch Width Control...............................................................................................................................22

3.20. Needle Bar Frame Clamp Device......................................................................................................................23

3.21. Straight and Zigzag Stitch Fitting.......................................................................................................................24

3.22. Spool Cap Usage................................................................................................................................................25

3.23. Anti-Spill Sleeve Usage......................................................................................................................................26

3.24. Knee Lifter Installation......................................................................................................................................26

3.25. Fittings for Buttonhole Stitching.......................................................................................................................29

3.26. Fittings for Hem Sewing....................................................................................................................................29

3.27. Fittings for Zipper and Cord Sewing..................................................................................................................30

-2-

Zigzag Sewing Machine

Instruction Manual and Parts List

4. Maintenance...................................................................................................................................................................31

4.1. Machine Head Cleaning........................................................................................................................................ 31

4.2. Lubrication........................................................................................................................................................ ...31

4.3. Safety Inspection...................................................................................................................................................31

5. Troubleshooting..............................................................................................................................................................32

6. Parts List..........................................................................................................................................................................33

6.1. Face Plate, Arm Top Cover and Arm Side Cover Components............................................................................ 33

6.2. Thread Take-up, Arm Shaft and Handwheel Components...................................................................................35

6.3. Needle Bar, Presser Bar and Throat Plate Components.......................................................................................37

6.4. Zigzag Triangular Cam and Hook Advancing Crank Components.........................................................................39

6.5. Bight Amplitude, Bight and L-C-R Position Components............................................................................... .....41

6.6. Arm Shaft (upright) and Rotating Hook Drive Shaft Components

.......................................................................

6.7. Hook and Bobbin Case Components.....................................................................................................................45

6.8. Feed Regulating Dial and Feed Reverse Lever Components................................................................................47

6.9. Feed Mechanism Components..............................................................................................................................49

6.10. Presser Bar Lifter and Thread Tension Components

.......................................................................................

6.11. Accessories and Attachments...........................................................................................................................S3

6.12. Thread Stand Components............................................................................................................................... 55

6.13. Beit Cover Components and Extra Parts..........................................................................................................57

Zigzag Sewing Machine

Instruction Manual and Parts List

1. Safety Instructions

1.1. l.’Tiportant Safety Instructions

When using this machine, basic safety procedures must be follow'-d Poad with attention all itistruction before using the machine. When using the machine, undersland all basic safely instructions which are not limited to the Items following. Read ail instructions, take care of this manual, and use it as rcfereitre when necessary.

• Before running the machine, make sura all relevant safety specifications are adequate to specifications and technical rules in ycui country.

• The machine should not Oc run without its safety devices.

*■ Tile machine shoulrj only be operated by properly trained personnel.

• For your safety, goggles must be used r unning the nnachine.

• Turn off or unplug the machine when the follov.inj:' situations arise;

o Passing ttie thread by the needle or r eplacing the bobbin or looper. o Replacing needle, presser fool, throat plate, feed dog and sliding piaie. cj When the machine is in maintenance. o When the operator is not running the madiine.

In case of lubricant oil contact with the eyes or skin, washed the surface with plenty of icy water wiUi a generous amount of cold water. In case of ingestion, seek medical help immediately.

Repair, fitting or mair.tenatice shouid only be performed by properly trained personnel. Maintenance and repair on electric equipment should only be made by qualified personnel. If cny

electrl;.. device is damaged, the machine should be immediately stopped. Before starting the machine in full running, a test must be conducted to assure that machine and

operator are able to perform the task.

The .machine should not be placed next to a sound source as an ultrasonic welding machine and other equipment.

The machine should only be run with the proper electric cable and connectors, and also the adequate grounding.

The machine shouid only be used to sew materials as indicated.in its instruction manual, and indications of use should be followed.

Singer will not be held responsible for any damage caused by unauthorized changes in the products.

Zigzag Sewing Machine

1.2. Safe Operation

To avoid the risk of electric shock, do not open the motor wiring box and do not touch the components assembled inside the wiring box.

To avoid injuries do not run the machine without the belt cover or in case any other safety device is removed.

To avoid possible injuries keep fingers, head and clothes far from wheel, belt and motor when the machine is running. Nothing should be placed near those parts.

To avoid injuries never put your fingers next to the rotating hook and the thread take-up lever cover when the machine is running.

The rotating hook whirls at high speed while the machine is running. To avoid hand injuries, keep them away from the rotating hook while the machine is running, turn off the machine to replace the bobbin.

To avoid possible injuries be careful when putting down or lifting the machine head. To avoid accident in case of a sudden start of the machine always turn it off when laying it down, or

remove the belt cover and the belt. If you machine is equipped with a servomotor, it does not make noises while being driven. To avoid a

possible accident caused by an unexpected start, be sure the machine is turned off.

Instruction Manual and Parts List

To avoid electrical shock, do not run the machine without proper grounding. To minimize the risk of accidents or damage in electric components caused by electric discharge turn

the machine off before unplugging it. Clean the machine periodically.

- 5 -

Zigzag Sewing Machine

2. Product Description and Machine SpeciffditliDn

2.1. Product Description

Zigzag Sewing Machine

Instruction Manuai and Parts List

-6-

Zigzag Sewing Machine

2.2. Machine Specification

Instruction Manual and Parts List

Table 1 - Machine Specification

Singer model

20U-109/ 109C 20U-112/112C 20U-309 For sewing Stitch type

Max. speed^ 2,500 rpm

Max. stitch bight Max, stitch length Needle bar stroke

Presser bar lift (manual)

Presser bar lift (knee lifter)

Needle catalog (needle system)

Needle size

Machine pulley

Oil

Workspace (w x h)

Bedplate dimensions

Light to medium

Plain zigzag (Straight stitch)

2,000 rpm

9.0 mm 12.0 mm

5.0 mm

34.8 mm

6.35 mm

9.0 mm

Cat. 1910-05 (135x9)

See Section 3,5 "Needle and Thread"

74.0 mm effective dia, for v-belt Singer Oil

211X 130 mm

399.0 mm x 178.0 mm

3-step zigzag

2,500 rpm

9.0 mm

Net weight (head only)

Gross weight (with accessories)

Noise^

Lower than 76 dBA at 1,600 spm

^ Maximum speed will vary depending on fabric, threads and sewing condition ^ Noise measurement according to DIN 4563-45-A 1.

21.0 kg

25.0 kg

Zigzag Sewing Machine

2.3. Motor, Motor Pulley and V-Belt Specifications

• Vi HP (400W) 4-pole (medium speed) clutch motor

• M type v-belt

Table 2 - Machine Speed vs. Motor Pulley Diameter

instruction Manual and Parts List

Machine Speed [spm]

20U-109/109C j 20U-112/112C 20U-309

2,500 1 2,000 1,800

2,000 2,000 105 1,800 1,800 90 75

1,500 .1,500

2,500 130 105

1,500

2.4. Relationship between Zigzag Bight and Maximum Speed

Table 3 ” Relationship between zigzag bight and maximum speed

Machine Class

Zigzag bight Max. Speed

20U-109/ 109C/309 0"'5.0 mm 5.0 ~ 9.0 mm 0 ~ 5.0 mm 2,500 rpm

2,000 rpm 2,000 rpm

Motor Puliey Diameter [mm]

SO Hz 60 Hz

20U-112/112C

5.0 ~ 12.0 mm 1,800 rpm

-8'

Zigzag Sevt/ing Machine

3. Setup and Adjustment Instructions

3.1. Table Cut-Out Drawing

Instruction Manual and Parts List

“I

50C

Figu 1

-9-

Zigzag Sewing Machine

3.2. Oil Reservoir Installation

The oil pan should be fixed on the side of the machine table groove by using four nails (Figure 2).

Instruction Manual and Parts List

Two rubber seats and two rubber corners for supporting the head portion should be fixed on the extended portion of the table by using nails, and the other two rubber cushion on the hinge side should be fixed on grooves by using nails too (Figure 3).

Two hinges fit into the hole in the machine bed, and the machine head fitted the table hinge's rubber, before the machine head Is placed to the cushions on the four corners of the table (Figures 3 and 4).

Figure 4

10-

Zigzag Sewing Machine

3.3. Belt Cover Installation

Above table surface

Align the belt guard so that hand wheel and v-belt move freely, then screw it down is this position (see Figure 5).

Below table surface

Install belt guard so that motor pulley and v-belt will rotate freely without interference.

Caution:

• Switch off the machine.

Instruction Manual and Parts List

• Set sewing head upright again using both hands.

• Danger of crushing between sewing head and table top.

• For your safety, do not run the machine without the belt cover.

3.4. Lubrication

■Ò Rotating hook and area under throat plate.

Turn hand wheel over toward you until oil hole in

rotating hook appear in sight. Apply one or two drops of oil to the oil hole (see

Figure 6).

11 -

Zigzag Sewing Machine

Loosen and remove screws and remove face plate by sliding it downward.

Remove screws and lift off arm top cover. Clean and oil the places indicated with *Cf.

Apply sufficient oil to all oil felt shown in Figure? Apply a small amount of grease to gear teeth

indicated with letter 'B*.

Also apply a drop of oil to all other oiling points shown

Keep oil pad 'A' under arm top cover saturated with oil.

Instruction Manual and Parts List

Figure 7

Caution;

Switch off the machine. Set sewing head upright again using both hands. Danger of crushing between sewing head and table top. For youf safety, do not run the machine without the belt cover.

Important:

When you first operate your machine after set up or after an extended period of disuse, oil the machine and run your machine at 1,000 to 1,500 spm for about 10 minutes for the purpose of bread-in.

12-

Zigzag Sewing Machine

Instruction Manual and Parts List

3.5. Needle and Thread

Selection of the proper needle depends not only on the machine model, but also on the material and thread used.

For selection of proper needle and thread sizes to be used on the various machine models please refer to the table below

Model 20U-1Û9 / 109C / 112 / 112C / 309

Application

Max. thread size (Nm)-

Synthetic*

Needle size (1/lOOmm)

Needle catalog (Needle

system)

or an equivalent size of other types of thread

Light weight materials

120

10(60)

1910-05 (135x9)

Caution:

• The power supply should be cut off before attaching the needle.

3.6. Inserting the Needle

Medium weight

materials

12 ~16 (80 ~100)

Mid-heavy weight

materials

18 ~ 19 (110 "'120)

Use needle Cat. No. 1910-05 needle system (135x9) only.

Raise needle bar to its highest position by turning hand wheel toward you.

Loosen needle set screw '1' (see Figure 8) Insert the needle in the needle bar and push it up as far as it will go.

Make sure its long groove faces toward the front. Tighten -needle set screw '1 securely.

Caution:

Switch off the machine. Do not operate the machine without the finger guard '2' (see Figure 8).

13-

Zigzag Sewing Machine

3.7. Bobbin Case Removal

Open bed slide. Raise latch '1' (see Figure 9). Lift out bobbin case '2' (see Figure 9).

Caution:

Instruction Manual and Parts List

• Switch off the machine.

• Do not operate the machine with throat plate left open.

3.8. Bobbin Winding

Stop motion of needle by loosening stop-motion screw '1', Figure 10. Hold hand wheel with left hand and turn stop-motion screw toward you with right hand.

-14-

Zigzag Sewing Machine

Place bobbin on bobbin winder spindle '3'. Figure 11, pushing it on as far as it will go.

Pre tension 'T (see Figure 11)

More tension

Instruction Manual and Parts List

Less tension

Push latch '2' in the direction indicated by arrow 'A', then start the machine (see Figure 11),

Bobbin winder spindle '3', rotate in the direction indicated by arrow 'B' (see Figure 11),

To adjust the amount of thread on bobbin, loosen screw '4' on latch '2' and swing the latch '2' away from you or toward you, as required.

For more thread on bobbin, swing latch '2' away from

you. For less thread on bobbin, swing latch '2' toward you.

If thread winds unevenly on bobbin, loosen screw '5' and move pre-tension 'V up or down, as required, and tighten screw '5'.

Caution:

• Do not guide or hold thread when winding the bobbin.

Threading the pre-tension for bobbin winding

3.9. Bobbin Case Threading

Hold bobbin case so that thread unwinds in the direction shown in Figure 12, and put bobbin in bobbin case.

Put thread into notch '1', and draw it under tension spring '2' (see Figure 13)

- 15

Zigzag Sewing Machine

Draw thread out from slot '2' on end of spring '1', (Figure 14) and pass it through bobbin case thread

guide 'V, Figure 15. Allow about 4 inches of thread to hang freely from

bobbin.

Instruction Manual and Parts List

Figure 13

Note:

• When straight stitching, a better result can be obtained if bobbin thread is not threaded through bobbin case thread guide '1' of Figure 15.

' 16-

Zigzag Sewing Machine

3.10. Bobbin Case Replacement

Hold bobbin case by latch '1' and place it on spindle of bobbin case holder '2' so that position finger '3' enters notch '4' at right of bobbin case holder (see Figure 17)

Release latch and press bobbin case firmly in place to assure proper position. Close bed slide

Caution:

• Switch off the machine.

Instruction Manual and Parts List

Figure 17

• Do not run machine without closing bed side. Danger of injury!

-17-

+ 42 hidden pages