Instruction Manual and Parts List High Speed Straight Lockstitch Sewing Machine 191D 20 / 20C 30 / 30C 70 / 70C ® 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 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 3.20 4 4.1 4.2 4.
Contents 6 Parts List 6.1 Frame and Cover Components 6.2 Arm Shaft and Thread Take-Up Lever Components 23 24 26 6.3 Needle Bar, Upright Shaft and Rotating Hook Driving Shaft Components 28 6.4 6.5 6.6 6.7 6.8 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 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.
2.2 Machine Specification Table 1 – Machine Specification Singer Model 191D-20 191D-20C Application Light to medium Maximum Speed [spm] Stitch Length [mm] Height of Presser Foot by hand / by knee [mm] Needle Bar Stroke [mm] 5,000 5.0 5.5/13.0 30.7 Hook Type 191D-30C Needle Cat. Lubrication Lubrication Oil Standard Regular 191D-30 Hook Origin Koban/ Hirose 1955-01 #14 Standard Medium to heavy 4,500 5.0 5.5/13.0 35.0 Heavy 3,000 7.0 5.5/13.0 35.
Setup and Adjustment Instructions 3.1 Table Cut-Out Drawing +1 181 - 0 115 22 0 2- R2 0 50 5 22. R3 2- 0 R1 2-DEEP 17 2-80 2-R 130 1200 R1 4- 2-12.75 108 8. 159 DE Ø16 EP 28 95 65 206 18 Ø 65 200 28 59 68.1 2-DEEP 23 4 Ø2 1 EP DE 2-DEEP 18 33 5 66 339.7 +1 480 - 0 130 0 28 Ø 8 R1 2- -R10 4 2-12.
Two rubber seats ‘1’ for supporting the head portion on the operator side ‘A’ are fixed on the extended 19.5mm Oil Reservoir Installation portion of the table by using nail ‘2’, and the other two rubber cushion ‘3’ on the hinge side ‘B’ are attached by nail too. Then, the oil reservoir ‘4’ is placed (Figures 2 and 3). 23.5mm 3.2 The oil reservoir should rest on the four corners of the machine table groove.
3.3 Belt Cover and Bobbin Winder Installation Caution For safety, the belt cover should be installed. The left and right parts of the bobbin winder should be parallel to the plate belt slot on the machine table. Drill four holes ‘A’, ‘B’, ‘C’ and ‘D’, in the machine table for screws (Figure 6). Insert support ‘1’ in the threaded hole in the housing. Install the front belt cover ‘3’ and get the hand wheel in the middle of the cover hole. Install the back belt cover ‘2’ at holes ‘C’, ‘D’.
3.4 Lubrication Precaution When you first operate your machine after set up or after an extended period of disuse, run your machine at 2,000 to 2,500 spm for about 10 minutes for the purpose of bread-in. Before turning the machine on, fill oil reservoir ‘1’ with sewing machine oil up to ‘MAX’ mark ‘A’ (Figure 7). When you operate the machine after lubrication, you will see splashing oil through oil sight window ‘2’ if the lubrication is adequate.
3.6 Rotating Hook Oil Supply Adjustment Unused machine should run idle for 3 minutes (Moderate intermittent operation). The amount of oil confirmation paper must be inserted in the state when the machine is running (Figure 9). Make sure the oil in the oil reservoir is within ‘MAX’ and ‘MIN’. The confirming time of the oil amount is 5 seconds (check the period of time with a watch).
3.7 Needle Attachment Caution Turn the hand wheel until the needle bar reaches the highest point of its stroke (Figure 12). Loosen screw ‘2’ and hold needle ‘1’ with its indented part ‘A’ facing exactly to the right in direction ‘B’. of the arrow until it will go no further. Tighten the screw ‘2’. Make sure the long groove ‘C’ of the needle is facing exactly to the left in direction ‘D’.
3.8 Bobbin Case Attachment Fix the bobbin into bobbin case with that the thread open end is directed to the left as observed from you. Pass the thread through thread slit ‘A’, and pulls it in direction ‘C’. By doing so, the thread will pass un- der the tension spring and come out from notch ‘B’ (Figure 13). When pulling the thread ‘C’, the bobbin should rotate in the direction of the arrow. Figure 13 3.
3.10 Stitch Length Adjustment Turn stitch length dial ‘1’ in the direction of the arrow, and align the desired number to marker dot ‘A’ on the machine arm (Figure 15). When you want to decrease the stitch length, turn stitch length dial ‘1’ while pressing feed reverse lever ‘2’ in the direction of the arrow. The indication of the dial is in millimeters. Figure 15 3.
3.12 Thread Take-Up Spring Adjustment The adjustment of the stroke of the thread take-up spring (Figure 18) Loosen setting screw ‘4’ and turn the tension post ‘3’. Loosen setting screw ‘2’. Turn the tension post ‘3’ clockwise (in direction ‘A’), the pressure of the spring will be increased. Turn the thread tension post ‘3’ clockwise (in direction ‘A’), the stroke of the thread take-up spring will be increased.
3.13 Knee Lifter Height Adjustment When using the knee lifter, the standard height of presser foot is 10 mm. You can adjust the presser foot lift up to 13 mm by turning the knee lifter adjusting screw ‘1’ (Figure 20). Figure 20 3.14 Presser Foot Lifter Adjustment Turn the presser foot lifter ‘1’ in direction ‘A’ to lift the presser foot (Figure 22). The presser foot will go up about 5.5 mm and stop.
3.15 Presser Foot Pressure Adjustment Loosen the nut ’2’, and turn the presser spring regulator ‘1’ clockwise (in direction ‘A’), the pressure of the presser foot will be increased (Figure 24). Tighten nut ‘2’. For general sewing of the fabrics, the standard height of the presser spring regulator ‘1’ will be around 33~36 mm (5 kg). Turn the regulator ‘1’ counter clockwise (in direction ‘B’), the pressure of the presser foot will be decreased.
3.16 Loosen screws ‘2’ and ‘3’ in feed eccentric cam ‘1’, move the feed eccentric cam ‘1’ in the direction of the arrow or opposite direction of the arrow, and firmly tighten the screws ‘2’ and ‘3’ (Figure 25). To advance the feed timing in order to prevent uneven material feed, move the feed eccentric cam in the direction of the arrow.
3.17 Feed Dog Height Adjustment When the feed dog ‘A’ is at its highest position, the teeth should be above the top surface of the throat plate ‘B’ as the below height for each machine variety (Figure 26). Loosen screw ‘2’ of crank ‘1’. Move the feed bar up or down to make a correct height. Securely tighten screw ‘2’. Caution If the screw ‘2’ is tightening too much, the crank ‘1’ will be worn out.
3.18 Needle to Rotating Hook Relation Adjustment Precaution If the clearance is too small, the rotating hook points will wear out, and too big, it will cause the skip stitch. When replacing the rotating hook, it should be using the original one. Adjusting the height of the needle bar (Figure 27) Adjusting the position of the rotating hook Turn the handwheel until the needle bar has been at the lowest point, loosen the setscrew ‘1’.
3.19 Presser Bar Height Adjustment Loosen setscrew ‘1’ (Figure 28) and adjust the height of the presser bar. When the presser foot rises to the highest, the distance between the throat plate and the presser foot is 5.5 mm (Figure 29). Tighten the setscrew ‘1’ after adjustment.
3.20 Thread TakeUp Stroke Adjustment When sewing for heavy weight material, the thread guides ‘1’ move to the left (in direction ‘A’) to increase the length of thread pulled out by the thread take-up. When sewing light weight material, the thread guides ‘1’ move to the right (in direction ‘B’) to decrease the length of thread pulled out by the thread take-up. When marker line ‘C’ on the thread guide ‘1’ is aligned with the center of the screw that is standard (Figure 30).
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. 4.2 Lubrication If the machine was idle for a long time, lubricate the machine according to the instructions of topics 3.4 to 3.6. 4.3 Check periodically if all safety devices are properly installed and adjusted.
Troubleshooting Problems Needle break Thread break Skip stitches Loosen stitches Wrinkled stitches Possible Causes Possible Solutions 1. Needle is installed wrong 1. Install needle correctly 2. Wrong needle type or size 2. Use proper needle for fabric and thread 3. Needle is bended 3. Replace needle 4. Wrong relation with rotary hook 4. Readjust the rotary hook 5. Needle doesn’t center the needle hole of throat plate or presser foot 5. Readjust the needle plate and presser foot 1.
Parts List High Speed Straight Lockstitch Sewing Machine | Instruction Manual and Parts List 23
6.1 Frame and Cover Components No. Part No. Description Qty.
6.1 Frame and Cover Components No. Part No. Description Qty.
6.
6.2 Arm Shaft and Thread Take-Up Lever Components No. Part No. Description Qty. 20 20C 30 30C 70 70C 1 10126001 Thread take-up crank shaft 1 1 1 1 1 1 2 101S15001 Screw SM15/64 x 28 L=10.
6.3 Needle Bar, Upright Shaft and Rotating Hook Driving Shaft Components No. Part No. Description Qty.
6.3 Needle Bar, Upright Shaft and Rotating Hook Driving Shaft Components No. Part No. Description Qty. 20 20C 30 30C 70 70C 9 101S11006 Screw SM 1/8 x 44 L=4.
6.
6.4 Presser Foot Components No. Part No. Description Qty. 20 20C 30 30C 70 70C 1 10111001 Hand lifter 1 1 1 1 1 1 2 101S11010 Screw SM9/64 x 40 L=9.
6.5 Feed Mechanism Components No. 1 Part No. Description Qty.
6.5 Feed Mechanism Components No. Part No. Description Qty.
6.
6.6 Lubrication Components No. Part No. Description Qty.
6.
6.7 Oil Reservoir Components No. Part No. Description Qty.
6.
6.8 Belt Cover, Bobbin Winder and Thread Stand Components No. Part No. Description Qty.
6.
6.9 Machine Accessories No. Part No. Description Qty.
P/N 364331-001 Rev 0 - Jan.2010 ® Singer is a registered trademark of The Singer Company Limited or its affiliated companies.
