Instruction Manual and Parts List Ultra High Speed Overedge and Safety Stitch Machine 321D 131M-04 131M-04 / KS 132M-015 134M-04 241M-24 241M-24 / KS 244M-24 251M-35 251M-35 / KH 251M-55 251M-55 / KH 251M-56 251H-56 / KH 321K 131M-04 131M-04 / KS 132M-015 134M-04 241M-24 241M-24 / KS 244M-24 251M-35 251M-35 / KH 251M-55 251M-55 / KH 251M-56 251H-56 / KH ® Singer is a registered trademark of The Singer Company Limited or its affiliated companies.
Contents 1 1.1 1.2 2 2.1 2.2 2.3 3 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.
Contents 6 6.1 6.2 6.3 6.4 6.5 6.6 6.7 6.8 6.9 6.10 6.11 6.12 6.13 6.14 6.15 6.16 6.17 6.18 6.19 6.20 6.21 6.22 6.23 6.24 6.25 6.26 6.27 6.28 6.29 6.30 6.
Safety Instructions 1.1 Important Safety Instructions • Before running the machine, make sure all relevant safety specifications are adequate to specifications and technical standards in your country. Important • The machine should not be run without its safety devices. When using the machine, basic safety procedures must be followed. Read with attention all instructions before using the machine. When using it, understand that all basic safety instructions are not limited to the following items.
1.2 For 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.
Product Description and Machine Specification 2.
With Clutch Motor With Direct Drive Servo Motor 6 321K-251H-56 / KH 5 6 5 321K-251H-56 321K-251M-55 / KH 5 321K-251M-55 5 5 321K-251M-35 / KH 2 4 5 3 2 321K-251M-35 4 4 2 321K-244M-24 321K-241M-24 / KS 4 4 321K-134M-04 321K-241M-24 1.
2.3 Motor, Motor Pulley and V-Belt Specifications 2.3.1 For 321D series ½ HP 2-pole clutch motor Motor pulley diameter M type v-belt Table 2 Machine Speed Motor Pulley Diameter [mm] [spm] 50 Hz 5,500 110 60 Hz 90 6,000 115 95 6,500 130 105 7,000 140 115 7,500 150 125 2.3.2 For 321K series Direct drive servo motor and control system.
3 Setup and Adjustment Instructions 5 40 R2 13 R2 60 6 R1 Table Cut-Out Diagram 5 3.1 20 65 65 225 141 210 25 115 95 C -C 185 625 45 B 50 40 358 B-B 9 25 345 A 55 A 4 R2 11 0 98 47 C 40 1.5 240 250 13 97.31 25 117.95 A-A 310 295 C 155 32 48 10 6 5 475 B R2 4 3 118.
3.2 Machine Installation Install the machine support components and the cloth waste chute as indicated in Figure 2. In case of semi-submerged assembly, the distance between the needle plate top surface and the table top is around 100 mm. For fullysubmerged assembly, the distance is around 5.0 mm.
3.2 Machine Installation Mount the machine head over the machine support plate. Connect the machine handwheel to the clutch motor with the v-belt (for 321D only) Adjust the tension of the v-belt so that it can be about 20 mm bent inward when you press the middle of it and make sure the motor turning direction is clockwise, referred to the Figure 3.(for 321D only) 2cm Figure 3 Set the pedal of the clutch motor to the left side and the pedal of the presser foot lift at right side.
3.3 Lubrication and Oil Drainage Remove the rubber plug and fill the lubricant oil (Singer Oil) until the indicator of the oil level between 'L' and 'H' lines of the oil level sight window. After that put back the rubber plug. When using the machine for the first time, or a machine that has not been used for some time, oil the needle bar top, the guides and looper before running it.
3.4 Fill Silicon Oil to Reservoir When sewing in ultra high speed, fill the device with silicon oil in order to prevent needle thread breakage and fabric damage. As show on Figure 8. Figure 8 3.5 Needle Attachment (or Replacement) Use only Singer’s Cat. 6120 needles needle). Loosen screw ‘1’ as indicated on Figure 9 & 10 with the Allen key wrench in the accessory box and insert the needle (or remove the old Insert the needle with its long groove facing towards you and push it up until the bar end..
3.6 Replacing Upper and Lower Knife Replacing the upper knife 1. Loosen screw ‘1’. Move lower knife holder ‘2’ to the extreme left position. Tighten screw ‘1’ temporarily. 2. Remove screw ‘3’ and then upper knife ‘4’. ‘1’. Make sure the upper and lower knives mate positively. Then tighten screw ‘1’. 4. Place a thread between the upper and lower knives. Check the cutting by turning the handwheel.
3.7 Machine Threading Important Refer to the sewing type you need for correct threading. Any incorrect threading may cause thread brake, uneven stitches or skip stitches. 3.7.1 1 Easy Threading Method Open three covers. Move the presser foot aside. Knot the preset thread and the thread being used together to thread the machine. 2 Needle thread Trim the knots off neatly before passing through the eye of the needle to rethread.
3.8 Thread Tension Adjustment Important The thread tension should be adjusted according to the type and thickness of the cloth, sewing thread, sewing width, stitch length and others. Therefore the pressure of the tension nuts or thread guides should be individually adjusted for each case. The following adjustments are related to Figure 16 &17. Tension Nut 1: controls the needle thread or the left thread in case of two needles. Tension Nut 2: controls the thread in the right needle.
3.9 Presser foot pressure Loosen adjusting nut ‘1’ of Figure 18 and turn adjusting bar ‘2’ to adjust the presser foot pressure.It should be as light as possible to be sufficient to obtain the proper stitch formation. 2 Heavy 1 Light Figure 18 3.10 Adjusting the Differential Feed Rate at sewing. Otherwise the fabric will be shrunk. The differential feed ratio is the ratio of movements between the main feed dog and differential feed dog.
3.11 Stitch Length Adjustment Press button to the end and keep it pressed as shown on Figure 20. Turn the handwheel until we have the desired stitch length. It is shown on the handwheel scale. Important The stitch length adjustment is made according to the sewing fabric, differential feed ration and other factors.
3.
4 4.1 Machine Head Cleaning Maintenance Clean the machine periodically with a soft and dry cloth to remove the excess of dust on the machine head. Do not use any kind of lacquer thinner to wipe the surface. Figure 28 4.2 Oil Change and Filter Cleaning When Machine is running, oil will be sprayed into the oil window. If no oil sprayed, please check oil level (see topic 3.
Troubleshooting Problems Broken needle Possible Causes Possible Solutions 1. Needle installed the wrong way. 1. Install the needle correctly. 2. Wrong kind of needle. 2. Use needle adequate for cloth and thread. 3. Damaged needle. 3. Replace for a new one. 4. Wrong relation with needle guards. 4. Adjust needle guards. 5. Wrong relation with looper. 5. Adjust the looper. 6. Needle is not centralized with the hole at the needle 6. Adjust the needle plate or the presser foot.
Troubleshooting Problems Uneven Stitches Puckering Poor chain-off stitches Possible Causes Possible Solutions 1. Wrong threading. 1. Threading correctly. 2. Wrong installation of thread stand. 2. Install thread support correctly. 3. Wrong setting of lower knfe. 3. Adjust lower knife correctly. 4. Knives does not cut perfectly. 4. Adjust or replace knives. 5. Thread guide or tension disc with burrs. 5. Replace the part. 6. Needle point damaged. 6. Replace the needle. 7.
Parts list
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6.1 Machine Bed Frame Components No. Part No.
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6.2 Machine Cover Components(1) No. Part No.
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6.3 Machine Cover Components (2) No. 1 Part No.
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6.4 Crank Shaft Drive Components No. Part No.
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6.5 Thread Tension Components No. Part No.
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6.6 Thread Guide and Thread Take-up Components (1) No. Part No.
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6.7 Thread Guide and Thread Take-up Components (2) No. Part No.
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6.8 Thread Guide and Thread Take-up Components (3) No. Part No.
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6.9 Needle Bar Components (1) No. Part No.
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6.10 Needle Bar Components (2) No. Part No.
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6.11 Needle Plate and Needle Guard Components No. Part No.
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6.12 Upper Looper Components No. Part No.
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6.13 Lower Looper Components No. Part No.
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6.14 Chain Stitch Looper Components (1) No. 1 Part No.
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6.15 Chain Stitch Looper Components (2) No. Part No.
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6.16 Differencial Feed Components No. 1 Part No.
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6.17 Feed Dog Components No. Part No.
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6.18 Knife Drive Components No. Part No.
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6.19 Presser Foot Components No. Part No.
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6.20 Lubrication Components (1) No. 1 Part No.
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6.21 Lubrication Components (2) No. Part No.
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6.22 Silicon Oil Reservoir Components No. Part No.
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6.23 Exclusive Parts List for 321K series No. 1 Part No.
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6.24 Thread Stand Components No. Part No.
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6.25 Accessories No. Part No. Description Qty 3 thread 4 thread 5 thread 1 10131005 Dust cover 1 1 1 2 20131037 Oil bottle 1 1 1 3 20131038 Small oil bottle 1 1 1 4 6120-06 Needle 3 3 3 5 20619003 Lower knife 1 1 1 6 20131041 Spanner (6mm) 1 1 1 7 20131042 Spanner (7mm) 1 1 1 8 20131043 Spanner (8mm) 1 1 1 9 20131044 Allen key driver (1.
6.26 Machine Support Plate For SemiSubmerged Components 3 2 12 1 6 9 4 10 5 7 8 11 No. Part No.
6.27 Specific Parts for 321D-251H and 321K-251H 1 6 2 5 4 3 7 12 8 9 10 11 No. 1 2 3 4 5 6 7 8 9 10 11 12 Part No.
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6.28 Optional Parts No. 1 Part No.
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6.29 Back Latch Components No. Part No.
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6.30 Vacuum Suction & AFL Device (Option parts) No. 1 Part No. 20731012 Description Qty 3 thread 4 thread 5 thread Vacuum suction assembly (For 321D only) 1 1 1 20731009 Vacuum suction assembly (For 321K only) (3) (3) (3) 2 20731012-1 Z basket (1) (1) (1) 3 20731012-2 Bag connecting cover (1) (1) (1) 4 20731012-3 Tube D38x0.
6.31 Chain Cutter Device Components 1 2 No. Part No.
5 -251H-56 (KH) 6 5 4 2 2 3 5 5 -241M-24 (KS) -244M-24 -251M-35 (KH) -251M-55 (KH) -251H- 56 (KH) 6 5 5 4 4 -134M-04 4 SW 1.5 NG -132M-015 -131M-04 (KS) 4 5 GAUGE 5 -251M-55 (KH) MACHINE MODEL 321D & 321K 2 3 -251M-35 (KH) 4 2 -241M-24 (KS) -244M-24 4 -134M-04 1.5 -132M-015 SW 4 NG GAUGE -131M-04 (KS) MACHINE MODEL 321D & 321K 2071405200 2071401700 2071400400 2071402200 2071400100 2071402000 2071400800 2071400100 MAIN FEED DOG ASSM.
P/N 364337-001 Rev.05 - Jun.2010 ® Singer is a registered trademark of The Singer Company Limited or its affiliated companies. © 2010 Copyright The Singer Company Limited www.singer.