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1. General The Pfatf 145 is a special-purpose sewi ng machine equipped with unis on feed, smoothly working sleeve take-up and vertical rotary hook, which sews forward and backward. It is chiefly used for sewing mult iple plies where it is important that all finish out evenly. Its permissible top speed is 2,80 0 s.p.m. When sewing tightly woven and heav ily dressed materials, the sewi ng speed should be reduced in order to prevent over heating of the needle.
___- 3. Cleaning and Oiling Careful cleaning and regu’ar oiling will incre ase the service life of your machine. After you have removed the dust which has accumulated on the machine in transit, take a clean rag and remove the grease from all nickel-plated and polished parts. Apply a few drops of kerosene to all oiling points marked by arrows in Figs. 1, 2 and 3, raise the presser, foot, unthread the needle and remove the bobbin case. Twice a week apply ‘a few drops of Pfaff sewing machine oil No.
From time to time remove the needle plate after taking out set screws 1 and 2 (Fig. 4) and remove the lint which has accumulated undern eath. The cleaning of the hook is dis cussed in Chapter 13. R 9927 I Fig. 3 R 9928 Fig.
4. Winding the Bobbin Place a spool of thread on pin 1 (Fig. 5) and pass the thread from left to right through eyelet 2, clockwise around and between tension discs 3 and from the inside throug h the slot in the bobbin. Wind a few turns of thread on the bobbin and place the latter on spindle 4. Start the bobbin winder by pressing down lever 5. The bobbin is wound automatically while the machine is sewing . When a sufficient amount of thread has been wound on the bobbin, a latch stops the bobbin winder.
5. Changing the Bobbin and Threading the Bobbin Case Raise the needle to its highest position and open the bed slide. With the thumb of your right hand open latch B (Fig. 6), then push the thumb nail under the projecting flange C of the bobbin case cap and lift the latter out of the machine with thumb and fore finger. The bobbin is now exposed in the bobbin case base and can be taken out easily. R 9930 Fig.
6. Setecting the Correct Need!e To ensure a reliable stitch formation , make sure the correct needle is inserted in the machine. Needle Systems The Pfaff 145 unison-feed machine in Models H 1 and H 2 uses Syst em 134 needles, while Model H 3 uses System 13435, and Model H 4 System 190 need les. Needle Point Styles These needles are available with diffe rent type points to suit different requ irements. The various needle point styles are iden tified by a letter following the need le system, e.g. 134 R.
Select the proper needle and thread sizes from the chart below: Model A H1,H2 B H 1, H 2, H 3 H2,H3,H4 Needle Size Cotton Silk Synthetic 60 130/3 130/4 140/3 200/3—150/3 70 100/3 100/4 120/3 140/3—120/3 80 80/3 80/4 100/3 120/3—100/3 90 70/3—60/3 70/4—60/4 80/3 100/3— 80/3 70/3 100 50/3—40/3 50/4—40/4 70/3 70/3 60/3 110 30/3 30/4 30/6 60/3 60/3 50/3 120 24/3 24/6 50/3 50/3 40/3 130 20/3 40/3 40/3 35/3 140 12/3 12/6 30/3 30/3 30/3 150 10/9 8/6 25/3 20/3
7. Changing the Needle Raise the needle bar to its high est point, loosen needle set screw A (Fig. 8) half a turn, and pull the damaged needle out of the needle clamp. Insert a new needle into the clam p, making sure that its short groo ve faces toward the sewing hook. Push the needle up as far as it will go and tighten needle set screw A securely. Never use rusty needles 8.
9. Drawing Up the Bobbin Thread Hold the end of the needle thread and turn the balance wheel toward you, as indicated by an arrow in Fig. 1, until the needle moves down and up again. As the needle moves up, it catches the bobbin thread which comes up with it through the needle hole. Lay both threads back under the presser foot, place the material in the machine and lower the presser foot. Hold the ends of both threads until the machine has made a few stitches. 10.
Adjusting the Lower Tension The tension is correct if a noticea ble resistance of spring V (Fig. 7) has to be overcome when pulling the thread out of the bobbin case. Take the bobbin case out of the machine and regulate the tension by turning screw Z, (Fig. 7) with the hook screwdriver, as appropriate. Turn this screw clockw ise for a tighter tension, or counter-clockwise for a looser tension. If puckering occurs on delicate materials although the tension has been set correctly, @as both tensions slightly.
re on the Materia’ 12. Regulating the Pressu to the sser foot must be adapted to be exerted by the pre ugh thro ed anc adv is l The amount of pressure if the materia pressure is set correctly . dog material to be sewn. The feed the h of t being injured by the teet the machine evenly withou n this knurled nut V (Fig. 1). Tur ing turn by l is regulated The pressure on the materia re.
14. The Safety Clutch Model C and D machinee are equipped with a safety clutch which prevents disturbance of the hook timing and damage to the bobbin case base in case of thread jamming in the hook raceway. If an irregulary spun needle thread should jam in the hook raceway and block the sewing hook, the safety clutch automatically diseng ages the hook drive.
16. Setting the Foot Lift To adapt the foot lift to the thickness of the material to be sewn, loosen wing nut F (Fig. 15) and adjust the position of lifting eccent ric connection H in the slot of the lifting crank. Move the connection upward for a higher foot lift, or downward for a lower foot lift. R 9935 Fig.
17. Operating the Treadle of the Pfaft 145 Equipped with -900 Thread Puller/Trimmer On special request, the Pfaff 145 in Models A and B can be equipped with the timeand cost-saving subcl. -900/06 thread puller/trimmer. On subcl. -900/02 machines, thread trimming, needle positioning and reverse sewing are all controlled by operating two treadles. When the tip of the right treadle is depressed, the sewing speed increases until the machine runs at its top speed.
18. Trouble Shooting Machine Skips Stitches Cause Remedy Wrong needle system. For correct needle system see Chapter 6. Insert new needle as instructed in Chapter 7. Orient needle so that its short groove faces toward the sewing hook. Thread needle as instructed in Chapters 5 and 8. Needle bent. Needle inserted incorrectly. Incorrect threading. Thread Breaks Cause Remedy For any of the reasons indicated above. Tread tensions too tight. See remedies listed above.
Contents Page 1. General ., 2. Fundamentals of Machine Operations 1 3. Cleaning and Oiling 2 4. Winding the Bobbin 4 5. Changing the Bobbin and Threading the Bobbin Case • 5 . 6. Selecting the Correct Needle Needle Systems 6 6 Needle Point Styles Needle and Thread Sizes • 6 . 6 7. Changing the Needle • 8 . 8. Threading the Needle 8 9. Drawing Up the Bobbin Thread 9 10. Regulating the Thread Tensions • . 11. Regulating the Stitch Length 12.
Nr. 296-12-12965 engl.
Component Parts for the Pfaff 145 in Models A,B,C,D and H1,H2,H3,H4 Model H2 C H2 A;B Hi A;B Part Name H3 C;D H3 B H4 C;D c Standard version 91-009 389-92 91-009 389—92 91—009 388—92 91-009 388—92 91-009 389—92 91—009 388—92 Balance wheel =L 91—010 131 9iDiO133-91 21 9110 91-010 1 D 91-015 652—92 9115 652—92 91310_172-91191-010_1721 C 91)08 244—91 91—008 244-91 Belt guard, complete 91108 244—91 I j 9108 244—91 9108 244—91 9108 244—91 o 9109 421 4241 91-002 504-5 9i-02 504—45
