Related Manuals for Pfaff 900/56
Summary of Contents for Pfaff 900/56
- Page 1 -900/56 -900/61 Service Manual for 440-R, 1440, 420 and 1420 series machines 296-12-14 827 Justieranleitung engl. 06.95...
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Page 2: Table Of Contents
Abbreviations ..................... Explanation of the symbols ................Tension release trip ................Solenoid bracket ................Solenoid bracket on -900/56 ................Solenoid bracket on -900/61 ................Engaging lever pin ................10 Eccentric pin of catcher control lever on -900/61 only ......11 Control cam and locking bracket ............ -
Page 3: Safety
Adjustment Safety Safety General notes on safety This machine may only be operated by adequately trained operators and only after having completely read and understood the Instruction Manual. All Notes on Safety and Instruction Manuals of the motor manufacturer are to be read before operating the machine! Pay attention to all warnings and safety instructions mounted on the machine! This machine may only be used for the purpose for which it is intended and may not be... -
Page 4: Safety Symbols
It is the obligation of the operator to ensure that none of the safety mechanisms are removed or deactivated. It is the obligation of the operator to ensure that only authorised persons operate and work on the machine. Further information can be obtained at your PFAFF agent. Operating and specialist personnel Operating personnel 04.01 Operating personnel are persons responsible for the equipping, operating and cleaning of the machine as well as taking care of faults arising in the sewing area. -
Page 5: Specialist Personnel
Adjustment Safety Specialist personnel 04.02 Specialist personnel are persons with a specialist education in the fields of electrics, electronics and mechanics. They are responsible for the lubrication, maintenance, repair and adjustment of the machine. The specialist personnel is obliged to observe the following points and must: always observe the Notes on Safety in the Instruction Manual! switch off the On/Off switch before carrying out adjustments or repairs and ensure that it cannot be switched on again unintentionally! -
Page 6: Adjustment
Adjustment Adjustment Special attention should be payed to the following This service manual is valid for the subclasses -900/56 and -900/61 for the PFAFF 440-R; 1440; 420 and 1420 series of machines. The PFAFF 442-R two needle version is illustrated. -
Page 7: Tension Release Trip
Adjustment Tension release trip Requirement When the broadest partof trip 5 is aligned with tension trip 6, with the control cam in resting position and the presser foot lowered, there must be a clearance of roughly 1 mm between the left side of trip 5 and tension release trip 6. 1 mm Remove solenoid bracket 1 (screws 2) Loosen screws 3 and for more extensive adjustments, also screws 4. -
Page 8: Solenoid Bracket
Adjustment Solenoid bracket Solenoid bracket on -900/56 Requirement When the tip of trip 1 is aligned with control pin 2 and the engaging lever has been operated, there must be a clearance of roughly 0.5 mm between the left inside of control cam 7 and control pin 6. - Page 9 Adjustment Solenoid bracket on -900/61 Requirement With engaging lever 1 operated, and control pin 2 positioned beside return motion cam 3, there must be a clearance of 0.5 mm between control pin 2 and return motion cam 3. 0.5 mm Turn balance wheel in feeding direction until needle bar is positioned 10 mm before b.d.c.
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Page 10: Engaging Lever Pin
Adjustment Engaging lever pin Requirement When the trimming mechanism is at rest there must be a clearance of 0.1 mm between the highest point of cam track 1 and control pin 2. Make sure control cam 1 is in its starting position. Then turn balance wheel until highest point of cam track 1 is aligned with control pin 2. -
Page 11: Eccentric Pin Of Catcher Control Lever On -900/61 Only
Adjustment Eccentric pin of catcher control lever on -900/61 only Requirement Over the entire cam circumference the roller of eccentric pin 4 must be as close to control cam 3 as possible. Turn balance wheel in feeding direction until needle bar is positioned 10 mm before b.d.c. Operate engaging lever 1. -
Page 12: Control Cam And Locking Bracket
Adjustment Control cam and locking bracket Axial position of crank lever Requirement Operate engaging lever 3 and turn the balance wheel to set control cam 5 at its far left position; there must then be a clearance of 0.2 mm between guide finger 8 and bottom of the control cam cutout (see below). -
Page 13: Radial Position Of Control Cam
Adjustment Radial position of control cam Requirement When the take-up lever is at t.d.c., the trimming action must be completed and control cam 3 must spring back to its starting position. Adjust guide finger 1 (screw 2) according to the requirement without moving it axially. -
Page 14: Locking Bracket
Adjustment Locking bracket Requirement With control cam 4 guided to the left and pushed to the left by hand and the needle bar at t.d.c. there must be a clearance of 0.5 mm between locking bracket 3 and control cam 4. 0.5 mm Turn balance wheel in feeding direction until needle bar is positioned 10 mm before b.d.c. -
Page 15: Engaging Solenoid
Adjustment Engaging solenoid Requirement With the needle bar positioned 10 mm before b.d.c. and engaging lever 2 operated, core 4 of the engaging solenoid must have a play of 1 mm. 1 mm Turn balance wheel in feeding direction until needle bar is positioned 10 mm before bottom dead centre. -
Page 16: Stop Lug
Adjustment Stop lug Requirement With stud 5 positioned at the highest point of disengaging cam 4 (take-up lever shortly before t.d.c.) there must be a clearance of 0.1 mm between stop lug 7 and the bedplate. 0.1 mm Turn balance wheel in feeding direction to set needle bar 10 mm before b.d.c. Operate engaging lever 1. -
Page 17: Catcher Actuating Lever
Adjustment Catcher actuating lever Requirement With the trimming mechanism at rest, ball-joint connecting link 2 must be at right angles to the edge of the bedplate. Also, there must be a clearance of 9 mm between the left edge of ball-joint connecting link 2 and the centre of catcher driving shaft 7. When difficult threads are processed and the catcher does not take up the bobbin thread reliably, the stroke of the catcher can be increased or decreased through the elongated hole in crank 3. -
Page 18: Catcher Connecting Rod (Two-Needle Machines)
Adjustment Catcher connecting rod (two-needle machines) Requirement The left bell-crank lever 4 must be parallel to the right bell-crank lever 5. Make sure control cam 1 is in starting position and loosen screws 2. Adjust catcher connecting rod 3 according to the requirement. In this position, tighten screws 2. -
Page 19: Catcher Height
Adjustment Catcher height Requirement Thread catcher 5 must pass 0.8 mm above bobbin case 6. If during a manual trimming test (chap. 19) the end of the thread catcher pushes against the bobbin thread, change height setting. 0.8 mm 1 4 3 Making sure that screws 1 are still loose, loosen screw 2. -
Page 20: Thread Catcher Rest Position
When the trimming mechansim is at rest, the triangular cutting tip of catcher 2 must be positioned 0.5 mm behind the cutting edge of knife 4. -900/61 -900/56 0.5 mm 0.5 mm Make sure trimming mechanism is in starting position and screws 1 are loose, then swing thread catcher 2 by hand according to the requirement. -
Page 21: Knife Height
With the thread trimmer in starting position the upper edge of knife 1 and catcher 2 should be of equal height. -900/61 -900/56 The distance plates, part no. 91-141 402-05 (thickness 0.5 mm) should be placed under the knife 1 for to adjust the height. -
Page 22: Knife Pressure
When half of front edge of catcher 3 has passed the knife cutting edge, knife 4 should contact the edge of the thread catcher with light pressure. -900/61 -900/56 Loosen screws 1 slightly. Turn balance wheel to set needle bar 10 mm before b.d.c. -
Page 23: Bobbin Thread Trapper Spring
Adjustment Bobbin thread trapper spring Requirement Thread trapper spring 4 must not be deflected during the catcher motion. After thread trimming, the bobbin thread must be trapped reliably. The bobbin case must be easy to remove from the sewing hook and easy to remove. 0.1 mm Making sure catcher 1 is in starting position, loosen screws 2 slightly. -
Page 24: Needle Thread Tension Release
Adjustment Needle thread tension release Requirement When the presser foot is lowered onto the needle plate and dog 1 has actuated tension release trip 2 there must be a clearance of at least 0.5 mm between both tension discs. 0.5 mm Lower presser foot onto needle plate by operating presser bar lift. -
Page 25: Synchronisizer
Adjustment Synchronisizer Requirement When sewing is interrupted, the machine must stop with the needle bar at a position 10 mm before b.d.c. After thread trimming the machine must stop with the take-up lever at t.d.c. See the service manual of the motor manufacturer. -
Page 26: Manual Trimming Test
0.6 mm before needle bar b.d.c. -900/61 2 mm -900/56 Thread machine, place fabric under presser foot and turn balance wheel to sew a few stitches. Turn balance wheel in feeding direction until needle bar is 10 mm before b.d.c. - Page 27 Notes...
- Page 28 Aktiengesellschaft Postfach 3020 D-67653 Kaiserslautern Königstr. 154 D-67655 Kaiserslautern Telefon: (0631) 200-0 Telefax: (0631) 172 02 Telex: 45753 PFAFF D Gedruckt in der BRD Printed in Germany Imprimé en R.F.A. Impreso en la R.F.A. Stampato in R.F.G. e a a...