PFAFF Sewing Machine Service & Repair Manual

How to Repair PFAFF How to Repair Sewing machine PFAFF C PFAFT)

Foreword This provisional Service Manual has been compiled in order to enable our service personnel to carry out all repairs on these machines quickly and satisfactorily. It will be superseded by the final edition when it is published. Before you carry out any adjustments, acquaint yourself with the settings discussed in this Manual and check whether the machine is actually out of adjustment. Since, apart from a few minor details, the mechanical setup of Pfaff machines 1222, 1221, 1212 and 1211 is the same, the instructions contained in this Manual apply to all of them. Variations in the adjustment procedure which are necessitated by differences in design are discussed separately. For checking up or adjusting a machine, it is best to follow the procedure outlined in the Manual. When re-assembling machines which have been dismantled completely, roughly adjust all parts in order to facilitate final adjustment. When ordering spare parts, please refer to the Spare Parts Catalogue and state the following: 1. Machine class 2. Complete ten-digit 3. Part name 4. Color of finish, if part is lacquered. 5. Old or new version, if applicable. When making electrical repairs, be sure to comply with the safety regulations in effect in your country. Since part of the electrical system of these machines must only be tested at low tension, proceed in strict compliance with the instructions given in the chapter on the "Electrical System". For this reason, all electrical repairs must be performed by an expert. Adjustment of the machine is greatly facilitated by the following tools and gauges: Needle rise gauge 87O 136-01 C-clamp for above gauge 87O 137-00 Bobbin case position slot gauge 7*501.00-201 Machine feed gauge 63-112 120-08 Special spanner 106 300-306 Combination spanner, 5«5 nun 43-111 010-04 Combination spanner, 7«0 mm 43-111 010-05 Combination spanner, 8 mm 43-111 010-06 Circlip pliers, ZA 21 07-438 000-40 Circlip pliers, A 1 07-438 000-50 Clip washer pliers, 1.9 kz 07-437 003-10 Clip washer pliers, 2.3 kz 07-437 003-20 Clip washer pliers, 3.2 kz 07-437 003-30 Clip washer pliers, 4.0 kz 07-437 003-40 Clip washer pliers, 5.0 kz 07-437 003-50 Clip washer pliers, 6.0 kz 07-437 003-60 Clip washer pliers, 7.0 kz 07-437 003-70

Contents Page Foreword 1 Technical Data 5 Stop Matic Mechanism Operation 1. Adjusting the Clutch Lever 7 2. Sotting the Roller in Relation to the Roller Clutch Pin 9 Zigzag Mechanism 3. Dismantling the Automatic Mechanism 10 Relative Adjustment of Worm Gears and of Drive Lever 11 6. Adjusting the Needle Position Knob 12 7. Basic Position of Eccentric Stud in Needle Bar Frame 13 8. Zeroing the Needle for Straight Stitching 14 9. Adjusting the Needle Vibration Controlled by the Zigzag Mechanism 15 10. Adjusting the Needle Position 17 11. Centering-The Needle Throw in the Needle Plate Slot l8 Buttonhole MechanismM 12. Op eration of Buttonhole Mechanism 20 13. Basic Position of Buttonhole Control Stop 22 lk. Adjusting the Relative Position of Driving Pawl and Ratchet Wheel 23 15. Timing the Pawl Stroke 2k 16. Final Adjustment of the Buttonhole Control Stop 26 17 Timing the Buttonhole Forward-Reverse Feed 28 Feed Mechanism 18. Lateral Adjustment of Feed Dog 29 19. Setting the Feed Dog Parallel to the Needle Plate 31 20. Setting the Feed Dog at the Correct Height 32 21. Adjusting the Feed Eccentric Clutch Sleeve 33 22. Adjusting the Feed Eccentric Endwise 35 23. Adjusting the Link-Type Feed Regulator Endwise 36 2k. Zeroing the Feed Regulator 37 25. Timing the Top and Bottom Feed Strokes 38

Adjusting the Drop Feed Mechanism 40 27. Setting the Presser Bar at the Correct Height 4l 28. Adjusting the Pressure on the Material 43 29. Lateral Adjustment of Feeding Foot in Relation to Sewing Foot 44 30. Adjusting the Feeding Foot in Sewing Direction 46 31. Adjusting the Feeding Foot Vertically 47 32. Adjusting the Vibrator 48 33. Timing the Buttonhole Forward-Reverse Feed 50 Sewing Mechanism 34. Adjusting the Position of the Needle in the Needle Plate Slot 52 35. Basic Position of Hook Bearing 52 36. Timing the Sewing Hook 53 37. Setting the Needle Bar at the Correct Height 54 38. Setting the Hook-to-Needle Clearance 57 39. Adjusting the Bobbin Case Position Finger 58 Automatic Mechanism 40. Operation 60 41. Fitting the Automatic Mechanism 63 Fixed-Ratio Automatic Mechanism 42. Setting the Clearance between Worm and Worm Wheel 65 43. Setting the Feeler Fingers Close to the Cam Stack 66 44. Adjusting the Needle Vibrating Controlled by the Fixed-Ratio Automatic Mechanism 67 45. Centering the Needle Throw in the Needle Plate Slot for Functional Stitching 69 46. Adjusting the Length of Forward and Backward Stitches for Hemstitching 70 ..... Variable-Ratio Automatic Mechanism 47. Setting the Feeler Fingers Close to the Cam Stack 72 48. Zeroing the Pattern Length Wheel 73 49. Close Setting of Feeler Finger for Scallops 74 Electrical System 50. Description of Electrical Equipment 75 51. Setting the Maximum Speed and the Speed for The Stop matic Control 79 52. Setting the Maximum Speed of Machine and Stop matic Mechanism on Machines Equipped with Dual-Voltage-Range Motors (110 and 220 V) 8l 53. Adjusting the Cleaned Belt Tension 8j> 54. Test Procedure and Trouble Shooting in the Electrical System 84

Page Sewing Off 5^. Adjusting the Dobbin Winder 85 55. Operation of Needle Threaded 86 56. Adjusting the Threaded Bar Collar 86 57» Adjusting the Needle Threaded Head 87 58. Tension Regulation 88 59* Adjusting the Bobbin Thread Tension 88 60. Adjusting the Needle Thread Tension 89 61. Adjusting the Tension Release Mechanism 90 62. Adjusting the Stroke of the Thread Check Spring 91 63. Adjusting the Length of Forward and Backward Stitches for Hemstitching 92 64a. Sitting the Household Overlook Stitch 92 a 6k. Adjusting the Length of Forward and Backward Stitches for Triple-Stitch Seams 93 65. Making a Sample Various repair jobs Swatch 94 66. Changing the motor and the carbon brushes 95 67. Changing the pressure spring in the balance-wheel realize Icon 99

Technical Data Pfaff 1222 free-arm sewing machine with additional top feed And combined automatic unit consisting of a fixed-ratio functional-stitch mechanism and a variable-ratio ornamental-stitch mechanism. Pfaff 1221 flatbed sewing machine with additional top feed And combined automatic unit consisting of a fixed-ratio functional-stitch mechanism and a variable-ratio ornamental-stitch mechanism. Pfaff 1212 free-arm sewing machine with fixed-ratio automatic functional-stitch mechanism. Pfaff 1211 flatbed sewing machine with fixed-ratio automatic functional-stitch mechanism. Fixed-ratio automatic unit with forward-reverse feed control, reduction ratio 12:1. Five functional stitches which can be varied by different zigzag settings or combined. Variable-ratio automatic unit with intermittent drive and stitch number regulation. Five ornamental stitches which can be varied by different needle position and pattern length settings or combined. Zigzag mechanism with needle vibration control and needle position adjustment (left, center, right). Stitch length and stitch width settings are combined in fixed relationship. Semi-automatic buttonhole unit with forward-reverse feed control. Feed eccentric clutch (for reverse sewing and buttonholing). Top and bottom feeds, 1:1 feed ratio, upper feeding foot can be disengaged. Electronic speed control by thyristor control. Master switch for electrical system. Stop matic control with roller clutch for controlling needle position at end of sewing action. Drop feed mechanism combined with vibrator for operating the presser bar. Power is transmitted from the arm shaft to the hook drive shaft by a clip belt at a ratio of 1:2. Power is transmitted from the motor to the shaft by a cleared belt. Link take-up. Vibrating needle bar frame. Transverse, double-revolution rotary hook. Needle system 130. Light-metal casting. Weight of machines with motor, but without accessories: Pfaff 1222 10.20 kg (22.4 lbs) Pfaff 1221 9.00 kg (19.8 lbs) Pfaff 1212 9.50 kg (20.9 lbs) Pfaff 1211 8.35 kg (18.3 lbs) Stitch length approx. 4 mm (6 s.p.i.) Stitch width approx. 4.5 mm (11/64")

Clear work space: 225 x 120 mm (9" x 4 3/4") Bedplate dimensions: 421 x 178 mm (15 1/2" x 7") Base plate dimensions on free-arm machines: 421 x 178 mm (15 1/2" x 7") Motor: Type GE 270, 220 or 110 V, 0-60 c/s, 40/80 W, 7000 r.p.m. + 10 % Type GE 271, dual-voltage-range motor for 220 or 110 V connection, 0-60 c/s, 40/80 W, 7000 r.p.m. + 10 % Fully radio and TV suppressed. Suppression class: FN Sewing head: insulation class 2 Motor alone: insulation class 1 Glare-free sewing light, 15 W. Finish: light grey (No. 6) Subject to alterations in design and dimensions. Various Data Needle bar rise Hook-to-needle clearance Needle bar height (top of needle eye to lower edge of hook point), set with machine set for widest zigzag stitch and needle on left of its throw. Clearance between bobbin case position finger and position slot Feed dog height Foot lift Maximum feeding foot rise Final phase of feed stroke Lowest position of darning foot above needle plate level Maximum sewing speed Maximum speed of Stop matic mechanism 2.0 mm (.08") 0.1 mm (.004") 0.5 mm (.02") 0.7 mm (.027") 0.9 mm (.035") 6.5 mm (.25") 1.2 mm (.05") 0.6 - 0.7 mm (.023" - .027") 0 - 0.1 mm (.004") 900 - 1000 r.p.m. 120 r.p.m.

STOPMATIC MECHANISM Operation The Stopmatic mechanism is engaged when the presser bar lifter is at its top or bottom-most position. When this lever is operated, this motion is transmitted to clutch lever 5 via connecting rod 32 (Fig. l). The clutch lever in turn engages and disengages a roller clutch. The machine is stopped by the Stopmatic mechanism when the take-up lever is roughly at its highest point. At this point, clutch lever 5 drops into a cutout in belt sprocket "}k and pushes against slide 33 (with pin).This slide, in turn, pushes against a roller and thus disengages the roller clutch. Micro switch 9 is switched off simultaneously. 1. Adjusting the Clutch Lever Rule: With the presser bar lifter up in Stopmatic position, there should be a clearance of 0.7 to 1.5 mm between slide 33 and clutch lever 5, so that when the presser bar lifter is pushed right down there is a minimum clearance of 0.1 mm. Also, lug 26 of lever 28 (Fig.l) must be in contact with micro switch 9 in both of the above positions of the presser bar lifter. Check: Remove the arm standard cover and the balance wheel. Take out the three screws 37 (Fig.2) and remove cover disc 36. Bring the presser bar lifter to the upper Stopmatic position and turn the arm shaft in sewing direction until clutch lever 5 (Fig.la) has dropped into the cutout of upper sprocket 34. Check the clearance of 0.7 to 1.5 mm (varies on individual machines) between slide 33 and clutch lever 5. Push the presser bar lifter down as far as it will go and check the minimum clearance of 0.1 mm, too. Adjustment: Push the presser bar lifter back up to the Stopmatic position. Loosen screw 29 and press lever 23 tc the left until the clearance of 0.7 to 1.5 mm is correct. Fully tighten screw 29.

Verification: Push the presser bar lifter up beyond its Stop matic position and watch the clearance while doing so. Push the presser bar lifter down as far as it will go and check the clearance again. During the longest stroke, there must be a safety clearance of 0.1 mm so that the micro switch is not operated. Note: If clutch lever 5 strikes slide 33 when the presser bar lifter is pushed up or down, the clearance must be repeatedly altered with the presser bar lifter up, until the lever no longer strikes the slide in the up or down position. It must not be possible for clutch lever 5 to snap out of the cutout in the upper sprocket when the arm shaft is turned backwards. Fig. 1 10

2. Setting the Roller in Relation to the Roller Clutch Pin ______________________________________ Rule: Pin 39 on the slide (Fig. 2) should be positioned slightly to the left of the middle of roller 38. Check: Lower the presser bar lifter and turn the balance wheel until roller 38 is at the top. Make a visual inspection (see Fig. 2). Fig. 2 Adjustment: Loosen the three screws 37 and turn the complete roller clutch 35 until the above setting is correct. Then tighten the three screws 37 securely again. Verification: Operate the Stop matic mechanism several times by flicking the presser bar lifter to its top and bottom-most positions.

PFAFF Sewing Machine Service & Repair Manual

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