Related Manuals for Pfaff 937
Summary of Contents for Pfaff 937
- Page 1 Instruction Manual 296-12-17 603 Betriebsanleitung engl. 04.97...
- Page 2 This instruction manual is valid for all models and subclasses listed in the chapter "Specification". The reprinting, copying or translation of PFAFF Instruction Manuals, whether in whole or in part, is only permitted with our previous permission and with written reference to the source.
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Page 3: Table Of Contents
Danger ........................1 - 3 Proper use ........................ 2 - 1 Specifications ......................3 - 1 PFAFF 937 ......................... 3 - 1 Models and subclasses ..................... 3 - 2 Needle and thread ..................... 3 - 2 Disposal of machine waste ..................4 - 1 Transport, packaging and storage ................ - Page 4 Removing/inserting the bobbin case ................. 9 - 3 Threading the bobbin case, adjusting the thread tension .......... 9 - 3 .04.01 PFAFF 937 without thread trimmer -900/..............9 - 3 .04.02 PFAFF 937 with thread trimmer -900/............... 9 - 4 Threading the needle thread ..................
- Page 5 Index Contents ................Chapter - Page .05.17 Zeroing the vibrating presser ................... 11 - 19 .05.18 Torsion spring of the reverse feed lever ..............11 - 20 .05.19 Torsion spring of the differentiation regulating shaft ..........11 - 21 .05.20 Feeding motion of the bottom feed dog ..............
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Page 6: Safety
Safety Safety 1.01 Directives This machine is constructed in accordance with the European regulations contained in the conformity and manufacturer’s declarations In addition to this Instruction Manual, observe also all generally accepted, statutory and other regulations and legal requirements and all valid environmental protection regulations! The regionally valid regulations of the social insurance society for occupational accidents or other supervisory organisations are to be strictly adhered to! General notes on safety... -
Page 7: Important Points For The User
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 authorized persons operate and work on the machine. Further information can be obtained at your PFAFF agent. 1.05 Operating and specialist personnel Operating personnel .05.01... -
Page 8: Danger
Safety Danger A working area of 1 meter is to be kept free both in front of and behind the machine while it is in operation so that it is always easily accessible. Never reach into the sewing area while sewing! Danger of injury by the needle! Never leave objects on the table or in the needle plate area while adjusting the machine settings! Objects can become trapped or be slung away! Danger of injury! -
Page 9: Proper Use
Proper use Proper use The PFAFF 937 is a high-performance high-speed zigzag sewing machine with bottom feed and an adjustable top feed. These machines are designed for producing topstitch zigzag seams in the apparel and linen goods industries. Any and all uses of these machines which have not been approved of by the... -
Page 10: Specifications
Specifications Specifications PFAFF 937 Stitch types: ....................301 (lockstitch) 304 (zigzag lockstitch) Models: ........................A and B Needle system: Top-feed model -706/81: ....................438 Top-feed model -706/83: ..................438-35 Needle thickness (Nm) in 1/100 mm: Model A: ........................60 - 70 Model B: ........................ -
Page 11: Models And Subclasses
Specifications Models and subclasses -6/61 5000 4200 -6/61-914/89 1600 PFAFF 937 -6/61 5000 4200 -6/61-914/89 1600 1600 N 2,5 -3/83 5000 4200 N 24 -6/41 ; 32/23 5000 4200 Dependent on material and work phase N 24 = 2.5 mm feeding stroke of the bottom feed = 4.5 mm feeding stroke of the bottom feed... -
Page 12: Disposal Of Machine Waste
Disposal of the machine Disposal of machine waste The proper disposal of machine waste is the responsibility of the customer. The materials used on the machines are steel, aluminium, brass and various plastics. The electrical equipment consists of plastics and copper. The machine waste is to be disposed of in accordance with the locally valid environmental protection regulations. -
Page 13: Transport Packaging And Storage
Transport packaging and storage Transport packaging and storage Transport to the customer’s premises Within the Federal Republic of Germany, the complete machine (with table and motor) is delivered without packaging. Machines without table and motor (only machine heads) and machines for export are packaged. -
Page 14: Explanation Of The Symbols
Explanation of the symbols Explanation of the symbols In the following section of this Instruction Manual, certain tasks or important pieces of information are accentuated by symbols. The symbols used have the following meanings: Note, information Cleaning, care Lubrication, greasing Servicing, repairing, adjustment, maintenance (only to be carried out by specialist personnel) 6 - 1... -
Page 15: Operational Controls
Operational controls Operational controls On/Off switch Turn the machine on and off by pressing the On/Off switch 1 to “1” for on and “0“ for off. When the machine is on, the control lamp 1 in the switch is lit. The On/Off switch in the illustration is that of machines with Quick motors. -
Page 16: Pedal
Operational controls Pedal Resting position Lift presser-foot (on machines with automatic presser-foot lifter) Trim thread (on machines with a thread trimmer) 4+1 = Call up the second top-feed setting Reverse sewing Further function-combinations can be found in the instruction manual of the motor manufacturer. -
Page 17: Adjustment Lever For Zigzag Stitch And Needle Position
Operational controls Adjustment lever for zigzag stitch and needle position The zigzag stitch adjustment lever 1 is used for adjusting the width of the zigzag stitch. To change the position of the adjustment lever, the locking lever 2 must be pressed against the adjustment lever 1. -
Page 18: Stitch-Length Adjustment Wheel
Operational controls Stitch-length adjustment wheel The stitch length can be altered by turning the stitch-length adjustment wheel 1. The current stitch-length can be seen on scale 2. Fig. 7 - 07 Adjustment wheels for the top feed Adjustment wheel 1 (1st setting) This adjustment wheel is for adjusting the setting with which the machine is to do most of its work. -
Page 19: Installation And Commissioning
Installation and commissioning Installation and commissioning This machine may only be installed and commissioned by qualified specialists! All relevant safety regulations are to be adhered to! If the machine is delivered without a table, the frame and table top used must be able to support the weight of the machine and the motor. -
Page 20: Tightening The V-Belt
Installation and commissioning Tightening the V-belt .01.02 Loosen nuts 1. Tighten V-belt using motor driven rocker dolly switch 2. Tighten nuts 1. 2 cm Fig. 8-02 shows a Quick motor. If another motor is used, proceed as described in the instruction manual of the motor manufacturer. -
Page 21: Fitting The Lower V-Belt Guard
Installation and commissioning Fitting the lower V-belt guard .01.04 Align the V-belt guard 1 so that the motor wheel and the V-belt run freely. Tighten screws 2. Fig. 8-04 shows a Quick motor. If another motor is used, proceed according to the instruction manual of the manufacturer. -
Page 22: Commissioning
Installation and commissioning Commissioning Check the machine, especially the electrical wiring and pneumatic tubes, for possible damage. Clean the machine thoroughly and then oil it / fill the oil reservoirs (see chapter 10 Care and maintenance). Have specialist personnel check if the motor of the machine can be operated with the available power supply and if it is connected properly in the terminal box. -
Page 23: Preparation
Preparation Preparation All regulations and instructions in this Instruction Manual are to be adhered to. Special attention is to be paid to all safety regulations! All preparatory work must only be carried out by appropriately trained personnel. When carrying out preparatory work, the machine is to be separated from the power supply by turning off the On/Off switch or by removing the plug from the socket. -
Page 24: Winding The Bobbin Thread, Adjusting The Thread Tension
Preparation Winding the bobbin thread, adjusting the thread tension Fig. 9 - 02 Place the empty bobbin 1 onto the bobbin winder spindle 2. Thread the thread in accordance with Fig. 9-02 and wind it a few times around bobbin 1 in a clockwise direction. -
Page 25: Removing/Inserting The Bobbin Case
Insert bobbin case 1 until you feel it click into place. Fig. 9 - 03 1 04 Threading the bobbin case, adjusting the thread tension PFAFF 937 without thread trimmer -900/.. .04.01 Insert bobbin 1 into bobbin case 2. Guide the thread through the slot under spring 3. -
Page 26: Pfaff 937 With Thread Trimmer -900
Preparation PFAFF 937 with thread trimmer -900/.. .04.02 Insert bobbin 1 into bobbin case 2. Guide the thread through the slot under spring 3. Adjust the thread tension by turning screw 4. When the thread is pulled the bobbin 1 must rotate in the direction of the arrow. -
Page 27: Threading The Needle Thread
Preparation Threading the needle thread Turn the machine off! Thread the needle thread in accordance with Fig. 9-06. Fig. 9 - 06 837-11-07 Adjusting the needle-thread tension Adjust the needle-thread tension by turning milled screw 1. Fig. 9 - 07 9 - 5... -
Page 28: Adjusting The Zigzag Stitch And Needle Position
Preparation Adjusting the zigzag stitch and the needle position Adjust the zigzag stitch width by turning the zigzag-stitch adjustment lever 1. To adjust locking lever 2, press against the zigzag-stitch adjustment lever 1. The setting can be seen on scale 3. Adjust the needle position by turning the needle-position adjustment lever 4. -
Page 29: Adjusting The Top Feed
Preparation Adjusting the top feed Normal sewing .09.01 Fig. 9 - 11 Fig. 9 - 10 Turn adjustment wheel 1 to “+“ as far as it will go. Turn adjustment wheel 2 until “0“ is at marking 3. Turn adjustment wheel 1 back until “0“ is at marking 3. Adjust the stitch length (see chapter 9.08 Adjusting the stitch length). -
Page 30: Applying Fullness Constantly
Preparation Applying fullness constantly .09.02 Fig. 9 - 12 Fig. 9 - 13 Turn adjustment wheel 1 to “+“ as far as it will go. Turn adjustment wheel 2 until the desired level of fullness (green numbers) is at marking 3. Turn adjustment wheel 1 back until the same green number is at marking 3. -
Page 31: Applying Fullness Intermittently
Preparation Applying fullness intermittently .09.03 Fig. 9 - 14 Fig. 9 - 15 Turn adjustment wheel 1 to “+“ as far as it will go. Turn adjustment wheel 2 until “0“ is at marking 3. Turn adjustment wheel 1 back until the desired level of fullness (green numbers) is at marking 3. -
Page 32: Constant Braking Of The Top Fabric Ply (Stretching)
Preparation Constant braking of the top fabric ply (stretching) .09.04 Fig. 9 - 16 Fig. 9 - 17 Turn adjustment wheel 1 to “+“ as far as it will go. Turn adjustment wheel 2 until the desired level of stretch (red numbers) is at marking 3. Turn adjustment wheel 1 back until the same red number is at marking 3. -
Page 33: Braking The Top Fabric Ply Or Intermittently Applying Fullness
Preparation Braking the top fabric ply or intermittently applying fullness .09.05 Fig. 9 - 19 Fig. 9 - 18 Turn adjustment wheel 1 to “+“ as far as it will go. Turn adjustment wheel 2 until the desired level of stretch (red numbers) is at marking 3. Turn adjustment wheel 1 back until the desired level of fullness (green number) is at marking 3. -
Page 34: Care And Maintenance
Care and maintenance Care and maintenance Cleaning ..........daily, more often when in continuous operation Oil level (zigzag eccentric lubrication) ............daily before use Oil level (hook oil-reservoir) ..................yearly Check the air pressure ................daily before use Water container of the air filter/regulator ..........daily before use * This maintenance interval is valid for an average running time of a single- shift sewing room. -
Page 35: Lubricating The Hook
(see arrow in Fig. 10-02). Return the machine to its upright position with both hands. Danger of crushing between machine head and table top! We recommend PFAFF sewing machine oil. Part no. 280-1-120 105. 10 - 2... -
Page 36: Lubricating The Zigzag Drive
Never allow the oil level to drop below the minimum mark 3. Only use oil with a mean viscosity of 22.0 mm /s at 40°C and a density of 0.865 g/cm at 15°C. We recommend PFAFF sewing machine oil. Part no. 280-1-120 144. 10 - 3... -
Page 37: Checking The Air Pressure
Care and maintenance Checking the air pressure Check the air pressure on the gauge 1 before every use of the machine. The gauge 1 must show a pressure of approx. 6 bar. Adjust to this value if necessary. To do so lift button 2 and turn it until the gauge shows approx. -
Page 38: Adjustment
Adjustment Adjustment On the PFAFF 937 no c-clamps may be attached to the needle bar as this would damage the special coating on the needle bar. Notes on adjusting All adjustments in these adjustment instructions are based on a completely assembled machine and must only be carried out by trained specialists. -
Page 39: Check And Adjustment Aid
Adjustment Check and adjustment aid By blocking with holes 1 - 5 the required needle bar positions can be fixed exactly. Fig. 11 - 01 Turn the balance wheel until the needle bar has approximately reached the required position. Place the 5 mm blocking pin in the appropriate hole and put pressure on it. Turn the balance wheel forwards and backwards a little until the blocking pin moves into the slot in the crank behind the bearing plate, thus blocking the machine. -
Page 40: Adjusting The Basic Machine
Adjustment Adjusting the basic machine Balancing weight .05.01 Requirement With the needle bar at bdc the largest eccentricity of the balancing weight 1 must be pointing upwards. Fig. 11 - 02 Bring the needle bar to bdc. Loosen nut 2 and screw 3. Turn eccentric pin 1 in accordance with the requirement. -
Page 41: Centering The Needle In The Needle Hole (In Sewing Direction)
Adjustment Centering the needle in the needle hole (in sewing direction) .05.02 Requirement With the zigzag setting at “0“ and the needle position set at “middle“ the needle must enter the center of the needle hole as viewed in the direction of sewing. Fig. -
Page 42: Parallel Guiding Of The Needle Bar
Adjustment Parallel guiding of the needle bar .05.03 Requirement Guide bar 5 must be parallel to the needle bar. Fig. 11 - 04 Bring the needle bar to tdc (hole 2). Loosen screws 1,2 and nut 3. The largest eccentricity of pin 4 must be facing downwards. Bring the groove on guide bar 5 into a position in which it rests against eccentric pin 4, turn eccentric pin 4 in accordance with the requirement and tighten nut 3. -
Page 43: Locking Lever
Adjustment Locking lever .05.04 Requirement The zigzag stitch adjustment lever 3 must be able to be locked in any position. Fig. 11 - 05 Loosen screw 2. Press locking lever 1 against the zigzag stitch adjustment lever 3. Turn pivot pin 4 as far as possible to the left. Release locking lever 1. -
Page 44: Zero Stitch And Zigzag Stitch Scale
Adjustment Zero stitch and zigzag stitch scale .05.05 Requirement With the zigzag stitch set at “0“: 1. the needle bar must not move laterally when the balancewheel is turned and 2. the marking “0“ on scale 1 must be at marking 2. Fig. -
Page 45: Centering The Needle In The Needle Hole (Across Sewing-Direction)
Adjustment Centering the needle in the needle hole (crosswise to sewing direction) .05.06 Requirement With the zigzag stitch set at “0“ and the needle position setting at “middle“ the needle must enter the center of the needle hole as seen across the direction of sewing. Fig. -
Page 46: Zigzag Stitch Width
Adjustment Zigzag stitch width .05.07 Requirement At the largest zigzag stitch setting, marking 1 must be at the largest zigzag value on scale 2. Fig. 11 - 08 Turn the zigzag stitch adjustment lever 3 in accordance with the requirement. Move screw 4 upwards until it touches and then tighten it. -
Page 47: Zigzag Stitch Motion
Adjustment Zigzag stitch motion .05.08 Requirement When the needle bar is at tdc coming from the right bdc (hole 2), the needle bar must not move laterally when the zigzag stitch adjustment lever is moved back and forth. 5 mm Fig. -
Page 48: Needle Penetration Symmetry
Adjustment Needle penetration symmetry .05.09 Requirement 1. With the zigzag stitch setting at “0“ the needle must enter the middle of the needle hole. 2. At the largest setting of the zigzag stitch the right and left needle-penetrations must be the same distance from the middle penetration. -
Page 49: Needle Position Adjustment Lever
Adjustment Needle position adjustment lever .05.10 Requirement The left and right throws of the needle must be the same size at the largest zigzag stitch setting and at the left or right needle position. Fig. 11 - 11 Loosen screws 1 and 2. Set the needle position adjustment lever 3 to “middle“... -
Page 50: Adjustment Wheels For Applying Fullness
Adjustment Adjustment wheels for applying fullness .05.11 Requirement With guide pin 2 in the middle of the connecting link and the ends of the toothed racks 6 flush with each other, the zero markings on the adjustment wheels 5 must be at marking 4. Fig. -
Page 51: Zeroing The Differentiation
Adjustment Zeroing the differentiation .05.12 Requirement At the longest stitch-length setting, the reverse sewing button 11 must be at its highest position. In addition, the stop finger 8 of clamp crank 7 must be touching the upper regulating shaft. Fig. 11 - 13 Unscrew screw 12 and the needle plate on machines with stitch length N24. -
Page 52: Main-Stitch-Length Display
Adjustment Main-stitch-length display .05.13 Requirement With the stitch length set at “0“, pointer 4 must be exactly at the marking “0“ on scale 5. Fig. 11 - 14 Turn the stitch length adjustment wheel 1 as far as possible in the direction of the arrow. Loosen nut 3. -
Page 53: Zeroing The Bottom Feed (With Gearbox Housing Closed)
Adjustment Zeroing the bottom feed (with gearbox housing closed) .05.14 Requirement With the stitch length set at “0“ the bottom feed dog must not carry out any feeding motion when the balance wheel is turned. Fig. 11 - 15 Loosen screw 1. Place the open-ended wrench (SW 27) on torsion nut 2 and use it to hold regulating shaft 3 still. -
Page 54: Zeroing The Bottom Feed (With Gearbox Housing Open)
Adjustment Zeroing the bottom feed (with gearbox housing open) .05.15 Requirement With the stitch length set at “0“ the bottom feed dog must not carry out any feeding motion when the balance wheel is turned. Fig. 11 - 16 Loosen screw 2. While continuously turning the balance wheel, turn diverter crank 1 until feed driving crank 3 no longer moves. -
Page 55: Vibrating Presser Connecting Rod
Adjustment Vibrating presser connecting rod .05.16 Requirement With the stitch length set at “0“, crank 3 on vibrating presser connecting rod 1 must be ho- rizontal. Fig. 11 - 17 Loosen screw 2. Move vibrating presser connecting rod 1 in accordance with the requirement. Tighten screw 2. -
Page 56: Zeroing The Vibrating Presser
Adjustment Zeroing the vibrating presser .05.17 Requirement With the adjustment wheels 3 at “0“ and the stitch length at “0“, the vibrating presser must not carry out any feeding motion when the balance wheel is turned. 37-14-18 Fig. 11 - 18 Loosen screw 2. -
Page 57: Torsion Spring Of The Reverse Feed Lever
Adjustment Torsion spring of the reverse feed lever .05.18 Requirement With the presser foot raised, the longest stitch length set and the adjustment wheels 5 at “0“, the reverse feed lever 4 must return automatically to its uppermost point after being activated. -
Page 58: Torsion Spring Of The Differentiation Regulating Shaft
Adjustment Torsion spring of the differentiation regulating shaft .05.19 Requirement With the presser foot raised, the stitch length set at “0“, adjustment wheel 3 at + 4.5 and adjustment wheel 4 at “0“, guide pin 1 must be touching in connecting link 2. Fig. -
Page 59: Feeding Motion Of The Bottom Feed Dog
Adjustment Feeding motion of the bottom feed dog .05.20 Requirement With the maximum stitch length set and the needle bar position 1.0 past tdc (hole 4), the bottom feed dog must not move when the reverse feed lever is pressed. Fig. -
Page 60: Lifting Motion Of The Bottom Feed Dog
Adjustment Lifting motion of the bottom feed dog .05.21 Requirement With the stitch length set at “0“ and the needle bar position at 0.25 mm past tdc (hole 3) the bottom feed dog must be at its upper point of reversal. Fig. -
Page 61: Drive Belt In The Gearbox Housing
Adjustment Drive belt in the gearbox housing .05.22 Requirement Drive belt 4 must be tightened so that the machine runs freely and the belt sprockets do not have any noticeable play. Fig. 11 - 24 Loosen screw 2. Move eccentric bearing bush 1 until drive belt 4 is in the middle of bobbin case opener drive wheel 3 and turn it in accordance with the requirement. -
Page 62: Hook Bearing Bracket
Screw on the hook bearing bracket adjustment gauge. On the PFAFF 937 the numbers “438 - 439“ must be visible from the front. Move or turn hook bearing bracket 4 in accordance with the requirement. Tighten screw 2. -
Page 63: Hook Lubrication
Adjustment Hook lubrication .05.24 Requirement 1. Centrifuge disc 2 must be 1.5 mm in front of the oil thrower. 2. With the machine working at top speed, a fine stripe of oil should appear after about 10 seconds on a piece of paper held over the needle plate cutout. Fig. -
Page 64: Pre-Adjusting The Needle Height
Adjustment Pre-adjusting the needle height .05.25 Requirement With the needle bar at tdc (hole 2) the distance between the point of the needle and the needle plate must be 19 mm. Loosen screws 1. 19 mm Fig. 11 - 27 Move the needle bar in accordance with the requirement without twisting it. -
Page 65: Needle Rise, Hook-To-Needle Clearance And Bobbin Case Positioning-Finger
Adjustment Needle rise, hook-to-needle clearance and bobbin case positioning-finger .05.26 Requirement 1. With the needle position set at “middle“, the zigzag stitch setting at “0“ and the needle bar position 2.0 past bdc (hole 1) the hook point must be in the middle of the needle and the distance between the needle and the hook point must be 0.05 - 0.1 mm. -
Page 66: Final Adjustment Of The Needle Height
Adjustment Final adjustment of the needle height .05.27 Requirement With the zigzag stitch set at “0“, the needle position set at “left“ and the hook point in the middle of the needle, the top edge of the needle eye must be 0.5 mm underneath the hook point. -
Page 67: Bobbin Case Opener Position
Adjustment Bobbin case opener position .05.28 Requirement 1. There must be a clearance of 0.5 mm between the top edge of the bobbin case opener and the inner edge of the bottom section of the bobbin case. 2. Between the bobbin case opener finger and the bottom section of the bobbin case opener there must be a clearance of 0.8 mm. -
Page 68: Bobbin Case Opener Motion
Adjustment Bobbin case opener motion .05.29 Requirement With the needle bar 2.0 past bdc (hole 1) the bobbin case opener 3 must be at its right point of reversal. Fig. 11 - 31 Loosen screws 2. Turn bobbin case eccentric 1 in accordance with the requirement. Tighten screws 2. -
Page 69: Bottom-Feed Dog Height
Adjustment Bottom feed dog height .05.30 Requirement With the stitch length set at “0“ and the needle bar position at 0.25 past tdc (hole 3) the bottom feed dog must be in the middle of the needle plate cutout and be touching the feed dog height-adjustment gauge along its entire length. -
Page 70: Clearance Between Presser Foot And Needle Plate
Adjustment Clearance between presser foot and needle plate .05.31 Requirement With the hand lever raised the needle must enter exactly in the middle of the needle hole in the presser foot and the clearance between the needle plate and the presser foot must be 7 mm. - Page 71 Adjustment Loosen screw 6 and press out eccentric pin 7. Loosen screw 8 and raise hand lever 9. Press the presser foot lifting finger downwards and tighten screw 8. For the following adjustments, screws 2 and 6 remain loosened and bearing bolt 3, connecting link 4 and eccentric pin 7 are not refitted.
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Page 72: Vibrating-Presser Feed And Connecting Lever
Adjustment Vibrating presser feed and connecting lever .05.32 Requirement 1. All moving parts of the vibrating presser must function freely and without play. 2. The vibrating presser must not touch the presser foot. Fig. 11 - 35 Lower the presser foot using hand lever 1. Loosen screw 2. - Page 73 Adjustment Insert pin 9 with its largest eccentricity facing downwards into the elongated hole of lever 8 and into the hole in lever 7. Tighten screw 10. Bring lever 11 to its outer point of reversal. Press lever 7 in the direction of feed until you feel it stop and then tighten screw 6. Loosen screw 12 and align the vibrating presser foot in accordance with requirement 2.
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Page 74: Vibrating-Presser Stroke
Adjustment Vibrating presser stroke .05.33 Requirement With the stitch length set at “0“, the presser foot resting on the needle plate and the vibrating presser foot at its upper point of reversal, there must one of the following clearances between the needle plate and the vibrating presser foot, depending on the model of the vibrating presser foot. -
Page 75: Vibrating-Presser Lifting Motion
Adjustment Vibrating presser lifting motion .05.34 Requirement The vibrating presser must be touching the bottom feed dog when the rising bottom feed dog has reached the top edge of the needle plate with the stitch length set at “2“. Fig. 11 - 37 Loosen screw 1 and turn eccentric bolt 2 in accordance with the requirement. -
Page 76: Vibrating-Presser Feeding Motion
Adjustment Vibrating presser feeding motion .05.35 Requirement At the maximum stitch length and with the needle bar at 1.0 past tdc (hole 4), the vibrating presser must not move when the reverse feed key is moved up and down. Fig. 11 - 37 Raise the presser foot. -
Page 77: Feeding Motion Difference
Adjustment Feeding motion difference .05.36 Requirement With both top feed adjustment wheels at “0“ and the largest stitch length set, the feeding strokes of the vibrating presser and the bottom feed dog must be the same length. Fig. 11 - 38 Loosen nut 2 and move bolt 1 in the elongated hole in accordance with the requirement. -
Page 78: Vibrating Presser And Presser Foot Pressure
Adjustment Vibrating presser and presser foot pressure 05.37 Requirement The material must be fed reliably even at top sewing speed. There must be no pressure marks on the material. 837-14-43a Fig. 11 - 39 The top edge of screw 1 must be approx. 13 mm underneath the top edge of the housing. -
Page 79: Thread Diverter Pin
Adjustment Thread diverter pin .05.38 Requirement With the needle bar at bdc the top edge of the thread guide hole must be at the same height as the bottom edge of the thread diverter. Fig. 11 - 40 Loosen screw 2. Move thread diverter 1 in accordance with the requirement, ensuring that it remains parallel to the base plate. -
Page 80: Needle-Thread Tension Release (Machines Without -900
Adjustment Needle-thread tension release (machines without -900/..) .05.39 Requirement With the hand lever raised the tension discs must be approx. 0.5 mm apart. 0.5 mm Fig. 11 - 41 837-14-40 Loosen screw 1 and press the connecting rod down as far as it will go. Raise the presser foot. -
Page 81: Limiting The Knee Lever Stroke
Adjustment Limiting the knee lever stroke .05.40 Requirement When the knee lever is pressed the hand lever must drop automatically and the presser foot must be just over 7 mm above the needle plate. 7 mm 14-41 Fig. 11 - 42 Loosen nut 1. -
Page 82: Knee Lever Play
Adjustment Knee lever play 05.41 Requirement When lightly pressing the knee lever there should be a noticeable play between nut 1 and fork 3. Fig. 11 - 43 Loosen nut 2. Turn nut 1 in accordance with the requirement and lock it with nut 2. 11 - 45... -
Page 83: Bobbin Winder
Adjustment Bobbin winder .05.42 Requirement 1. With the bobbin winder engaged the bobbin winder spindle must be turned reliably, but friction wheel 3 must not touch drive wheel 1 when the bobbin winder is switched off. 2. The bobbin winder must disengage automatically when the thread is approx. 1 mm from the edge of the bobbin. -
Page 84: Adjusting The Thread Trimmer -900/51
Adjustment 11.06 Adjusting the thread trimmer -900/51 Pre-adjusting the control cam .06.01 Requirement With the needle bar at tdc (hole 2): 1. the beginning of the highest point of the lobe of control cam 1 must be underneath the point of pawl 2, 2. -
Page 85: Roller Lever
Adjustment Roller lever .06.02 Requirement With the needle bar 2.0 past bdc (hole 1): 1. the roller of roller lever 1 must fall lightly into control cam 2 when roller lever 1 is lightly tapped Fig. 11 - 46 37-14-45 Loosen screws 3 and 4. -
Page 86: Pawl
Adjustment Pawl .06.03 Requirement With the thread trimmer in resting position there must be a clearance of 0.3 mm between pawl 1 and the largest eccentricity of the lobe on control cam 2. 0.3 mm 37-14-46 Fig. 11 - 47 Position the largest eccentricity of the lobe on control cam 2 underneath pawl 1. -
Page 87: Engaging Solenoid
Adjustment Engaging solenoid .06.04 Requirement With the needle bar 2.0 past bdc (hole 1) there must be a clearance of 0.2 to 0.3 mm between engaging lever 2 and pawl 1 when the engaging solenoid is active. 37 14 47 Fig. -
Page 88: Release Lever
Adjustment Release lever .06.05 Requirement With the needle bar 2.0 after bdc (hole 1) there must be a clearance of 0.2 mm between the roller of roller lever 1 and the base of control cam 2 with the engaging lever active. 0.2 mm 837-14-48 Fig. -
Page 89: Engaging Lever
Adjustment Engaging lever .06.06 Requirement With the needle bar at tdc and the thread trimmer in resting position, there must be a clearance of 0.3 to 0.5 mm between the roller of roller lever 1 and the external diameter of control cam 2. -
Page 90: Thread Catcher Position And Cutting Test
Adjustment Thread catcher position and cutting test .06.07 Requirement With the thread trimmer in resting position the edge of thread trimmer 1 must be flush with the edge of bracket 2. 14-50 Fig. 11 - 51 Loosen nuts 4 (left and right-handed threads). Turn connecting rod 3 in accordance with the requirement and tighten nuts 4. -
Page 91: Control Cam (Final Adjustment) And Retaining Spring
Adjustment Control cam (final adjustment) and retaining spring .06.08 Requirement 1. with the end of thread guard 1 at the height of the right edge of bobbin case position finger 2, thread catcher 3 must begin its forwards movement. 2. With the thread trimmer in resting position there must be a clearance of 0.5 mm between retaining spring 7 and roller lever 8. -
Page 92: Needle-Thread Tension Release
Adjustment Needle thread tension release .06.09 Requirement 1. With hand lever 4 raised, the clearance between the tension disks must be 0.5 mm. 2. With the rock shaft 6 in its neutral position there must be a clearance of 0.5 mm between trip 8 and release cone 9. - Page 93 Adjustment Loosen nut 7. Adjust the clearance between trip 8 and release cone 9 in accordance with requirement 2. Tighten nut 7. Position the feed dog underneath the needle plate and bring the presser foot to rest on the needle plate. Press clamp piece 10 upwards.
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Page 94: Removing And Refitting The Control Unit
Adjustment Removing and refitting control unit .06.10 Fig. 11 - 54 To remove the control unit, pull plug 1 out of the socket of the motor control plate or the control box. Remove circlip 2 and disconnect connecting rod 3. Disconnect the ball joints of connecting rod 7 from the studs on the cutting and control unit and remove the complete control unit. -
Page 95: Synchronizer
Adjustment Synchronizer .06.11 Requirement 1. When sewing is stopped, the machine must position approx. 4 - 5 mm past the bdc of the needle bar. 2. After trimming the thread the machine must position at the tdc of the take up lever. For adjustment see the instruction manual of the motor manufacturer. - Page 96 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...