Pfaff 3704-2/02 Instruction Manual Download Page 82

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12 - 30

Adjustment

.05.28

Lifting stroke of the main and differential feed dogs

Requirement

With the stitch length set at "

" and the needle bar positioned at 0.25 after t.d.c. (hole 3),

the feed dogs should be at the top of their stroke.

Fig. 12 - 29

●

Adjust feed lifting eccentric

(screws

) in accordance with the

requirement

Feed lifting eccentric

should not be axially displaced.

Summary of Contents for 3704-2/02

Page 1: ...Instruction Manual 296 12 18 603 002 Betriebsanleitung engl 01 05 This instruction manual applies to machines from the following serial numbers onwards 2660862 2 02 2 03 939 U 3704 ...

Page 2: ...ns Reprinting copying or translation of PFAFF instruction manuals whether in whole or in part is not permitted without our prior permission and not without written indication of the source PFAFF Industrie Maschinen AG Postfach 3020 D 67653 Kaiserslautern Königstr 154 D 67655 Kaiserslautern ...

Page 3: ... 02 Keys on the machine head only on machines with Quick flange motor 7 1 7 03 Pedal on the PFAFF 939 U 7 2 7 04 Pedal on the PFAFF 3704 2 7 2 7 05 Lever for raising presser foot 7 3 7 06 Knee lever only on the PFAFF 939 U 7 3 7 07 Adjustment lever for zigzag stitch and needle position 7 4 7 08 Reverse feed key 7 4 7 09 Stitch length adjustment wheel 7 5 7 10 Adjustment wheels for the top feed onl...

Page 4: ...g the bobbin case adjusting the thread tension 9 3 9 05 Threading the needle thread Adjusting the needle thread tension on the PFAFF 939 U and PFAFF 3704 2 03 9 4 9 06 Threading the needle thread Adjusting the needle thread tension 9 5 on the PFAFF 3704 2 02 9 5 9 07 Setting the zigzag stitch and the stitch position 9 6 9 08 Adjusting the stitch length 9 6 9 09 Adjusting the differential feed on t...

Page 5: ...tion adjustment lever 12 15 12 05 14 Adjustment wheels for differential feed only on the PFAFF 939 U 12 16 12 05 15 Zeroing the differentiatio only on the PFAFF 939 U 12 17 12 05 16 Differential feed synchronisation only on the PFAFF 3704 2 12 18 12 05 17 Position of the stitch length adjustment wheel on the PFAFF 939 U 12 19 12 05 18 Position of the stitch length adjustment wheel on the PFAFF 370...

Page 6: ...4 2 02 12 45 12 05 44 Switching to reverse feed only on the PFAFF 3704 2 03 12 46 12 05 45 Thread puller only on the PFAFF 3704 2 02 12 47 12 06 Adjusting the thread trimmer 900 24 12 48 12 06 01 Axial position of the control cam 12 48 12 06 02 Preliminary adjustment of the control cam 12 49 12 06 03 Position of the thread catcher and cutting test 12 50 12 06 04 Readjustment of the control cam 12 ...

Page 7: ...e is left unattended and during maintenance work the machine must be isolated from the power supply by turning off the on off switch or removing the plug from the mains Daily maintenance work must only be carried out by appropriately trained persons Repairs and special maintenance work must only be carried out by qualified technical staff or persons with appropriate training During maintenance or ...

Page 8: ...t of the machine and must be available to the operating staff at all times This instruction manual must be read before the machine is operated for the first time Both operating and technical staff must be instructed on the safety devices of the mach ine and on safe working methods It is the duty of the user to operate the machine in perfect running order only The user must ensure that none of the ...

Page 9: ... occurring on the machine which may affect its safety must be reported to the user immediately 1 05 02 Technical staff Technical staff are persons who have been trained in electrical engineering electronics and mechanical engineering They are responsible for lubricating servicing repairing and adjusting the machine The technical staff is obliged to observe the following points The notes on safety ...

Page 10: ...accidentally Do not operate machines with Quick underfloor motor without belt guard 4 and 5 Danger of injury from the drive belts 1 06 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...

Page 11: ...lar to top collar with imitation hand stitch and fullness application The PFAFF 3704 2 03 is an engineered workplace with high speed zigzag sewing machine The machine is used to sew collars in the outerwear clothing industry Planned operation Sew undercollar to top collar with zigzag seam and fullness application Any use of these machines which is not approved by the manufacturer shall be consider...

Page 12: ...FF 3704 2 5500 spm Max stitch with 6 0 mm Connection data for Quick motors Operating voltage 230 V 10 50 60 Hz Max power 1 2 kVA Fuse protection 1 x 16 A inert Noise data Noise emission level at workplace with a sewing speed of 3600 spm LpA 80 dB A Noise measurement in accordance with DIN 45 635 48 A 1 ISO 11204 ISO 3744 ISO 4871 Working air pressure 6 bar Air consumption ca 1 N1 cycle Net weight ...

Page 13: ...nd various plastic mat erials The electrical equipment comprises plastic materials and copper The machine is to be disposed of according to the locally valid pollution control regula tions if necessary a specialist ist to be commissioned Care must be taken that parts soiled with lubricants are disposed of separately according to the locally valid pollution control regulations ...

Page 14: ...the machines are only transported in an upright position 5 03 Disposal of packing materials The packing materials of this machine comprise paper cardboard and VCE fibre Proper dis posal of the packing material is the responsibility of the customer 5 04 Storage If the machine is not in use it can be stored as it is for a period of up to six months but It should be protected against dust and moistur...

Page 15: ...nstruction manual work to be carried out or important information is accentuated by symbols These symbols have the following meanings Note information Cleaning care Lubrication Maintenance repairs adjustment service work only to be carried out by technical staff ...

Page 16: ...reverse Bring the machine into a switching position for switching from zig zag to multi stitch or from multi stitch to zig zag by operating key 2 Key 3 can be assigned with the appropriate parameter settings see Motor Instruction Manual Fig 7 02 Fig 7 01 7 Controls 7 01 Main switch The machine is switched on or off by turning the main switch 1 1 04 1 2 3 ...

Page 17: ...second feed stroke value 4 2 Reverse sewing Further function combinations can be found in the instruction manual of the motor manufacturer Fig 7 03 3 0 1 4 1 2 7 04 Pedal on the PFAFF 3704 2 The position of the presser foot and the needle depend on the selected functions see Chapter 7 15 Control panel 0 Machine stop 1 Lower presser foot or sewing start 2 Sew 1 Raise presser foot 2 End bartack and ...

Page 18: ...ng presser foot The presser foot is raised by turning lever 1 Fig 7 05 1 7 06 Knee lever only on the PFAFF 939 U On machines without an automatic pres ser foot lift the knee lever 1 is used to raise the presser foot Fig 7 06 112 003 1 ...

Page 19: ...r the locking lever 2 must be pressed against the adjustment lever 1 The current zigzag stitch width can be seen on scale 3 By turning the needle position adjustment lever 4 the required needle position can be set L needle position left M needle position center R needle position right Fig 7 07 4 M L R 2 1 3 1 Fig 7 08 7 08 Reverse feed key The machine sews in reverse as long as the reverse feed ke...

Page 20: ...the PFAFF 939 U Adjustment wheel 1 1st setting This adjustment wheel is for adjusting the setting with which the machine is to do most of its work Green area Apply fullness Red area Stretch Zero Normal sewing The main and differential feed dogs work with the same feed stróke Adjustment wheel 2 2nd setting Adjustment wheel 2 is used for setting a value which deviates from the first setting This val...

Page 21: ...hapter 7 14 Knee switch If the machine is set at the standard setting display unit 3 on the machine head is green 7 12 Adjustment wheel for multi stitch and zigzag stitch only on the PFAFF 939 U Before sewing begins make sure that adjustment wheel 1 is locked in position Only switch over when the machine is at a standstill Danger of machine damage It is possible to switch between multi stitch and ...

Page 22: ...ge guide Press knob 1 in the direction of the arrow until it locks into place Switching off the edge guide Press down key 2 112 006 1 2 7 14 Knee switch only on the PFAFF 3704 2 By pressing knee switch 1 it is possible to switch between the two settings of the differential feed Fig 7 16 112 007 1 ...

Page 23: ...plays Activated functions are displayed with a triangular marking 3 below or next to the respective function key In the sewing mode all relevant sewing data is displayed and can be changed directly depending on the status of the machine see also Chapter 10 Sewing During the parameter input the selected parameter number with the corresponding value is displayed see Chapter 12 07 02 Example of a par...

Page 24: ...he function is switched on the needle positions at t d c after sewing stops Foot position after stop If this key is pressed the foot raised after sewing stop function is switched on or off When the function is switched on the presser foot is raised after sewing stops Foot position after trimming If this key is pressed the foot raised after thread trimming function is switched on or off When the fu...

Page 25: ...d of the machine is firm and steady also during sewing 8 01 Installation The site where the machine is installed must be provided with suitable connections for elec tric current It must be ensured that the standing surface of the machine site is firm and horizontal and that sufficient lighting is provided for For packing and transportation reasons the table top is in the lowered position The table...

Page 26: ... with distance bush 4 into threaded hole 5 Align the V belt guard taking care that clip 6 is behind slot 7 and in front of distance bush 4 Tighten screws 1 and 2 through holes 8 and 9 and screw 3 When using an external motor the motor cover must also be fitted as described by the motor manufacturer 8 01 03 Fitting the reel stand Fit the reel stand as shown in Fig 8 03 Afterwards insert the stand i...

Page 27: ...with screws 6 as shown in Fig 8 04 Slide toothed belt wheel 2 onto the motor shaft 3 and fasten with screws 1 Slightly tilt bearing plate 4 with motor 5 to the side and place the toothed belt 7 on the toothed belt wheels Align bearing plate 4 of motor 5 on the machine case and attach it with screws 8 8 03 Fit the belt guard of the Quick flange motor Attach belt guard 1 with screws 2 and 3 Fig 8 05...

Page 28: ...8 4 Installation and commissioning 8 04 Table top cutout for the PFAFF 939 U ...

Page 29: ...tion and commissioning 8 05 Table top assembly for the PFAFF 939 U Speedcontrolunit View Underside table top Controlbox P 40 ED Stand position 906 3550 005 895 Holes for fastening the motor screwed inserts M8 x 30 ...

Page 30: ...cables Fig 8 06 Connect all plugs as labelled to the control box Screw the earth cable from the sewing head and the main switch 1 to earth point A Connect earth point A to earth point B with earth cable 2 Screw the earth cable 3 from the motor to earth point B 2 B X1 X2 X3 X5 X4 3 A 1 2 ...

Page 31: ... of the machine drive unit Connect the machine to the compressed air system The pressure gauge should show a pressure of 6 bar If necessary adjust the value see Chapter 11 05 Checking adjusting the air pressure Fig 8 07 1 2 Fig 8 08 Before commissioning the machine remove plug 1 from its hole and fill in oil up to marking 2 see Chapter 11 02 Oiling the hook Plug 1 serves as a safety device for tra...

Page 32: ...e machine Press TE Speed key twice to call up the input mode 2 x By pressing the corresponding key call up parameter 798 and select value II service level C see Chapter 12 07 01 Selecting the user level TE 101 on A B C D 3 3 3 3 TE 798 11 C By pressing the corresponding key call up parameter 800 rotation direction of the motor By pressing the corresponding key enter the value 1 TE 800 1 A C ...

Page 33: ...n until the needle tip is level with the top edge of the needle plate when penetrating on the left hand side Set the value at 0 with the corresponding key By pressing the corresponding key call up parameter 702 By pressing the corresponding key enter value 70 for the PFAFF 939 U and PFAFF 3704 2 03 or value 26 for the PFAFF 3704 2 02 By pressing the corresponding key call up parameter 703 C TE 702...

Page 34: ...OR 92 013 8 10 Mounting connecting the start inhibitor only on machines with Quick Anbaumotor For machines delivered without a table the plate 1 from the accessories should be mounted under the table top so that the switch lug 2 is resting on plate 1 when the sewing head is in an upright position Loosen screws 3 and adjust switch 4 so that the switch lug 2 is free when the sewing head is tilted ba...

Page 35: ...olated from its power supply by turning off the on off switch or removing the machine plug from the electric power socket 9 01 Inserting the needle Switch off the machine Danger of injury if the machine is started accidentally Only use needles from the system intended for the machine see Chapter 3 Specifications Bring the needle bar into its highest position Loosen screw 1 Insert the needle 2 as f...

Page 36: ... and wind it clockwise around bobbin 1 a few times Switch on the bobbin winder while at the same time pressing bobbin winder spindle 2 and lever 3 The bobbin is filled up during sewing The thread tension on bobbin 1 can be adjusted using knurled screw 4 The bobbin winder stops automatically when bobbin 1 is full If the thread is wound unevenly Loosen nut 5 Turn thread guide 6 accordingly Tighten n...

Page 37: ...clip 1 and remove bobbin case 2 Inserting the bobbin case Insert bobbin case 1 until you feel it click into place 9 04 Threading the bobbin case adjusting the thread tension Insert bobbin 1 into bobbin case 2 Pass the thread through the gap under spring 3 and through the hole in bobbin case 2 Adjust the thread tension by turning screw 4 When the thread is pulled the bobbin 1 must rotate in the dir...

Page 38: ...e thread tension on the PFAFF 939 U and PFAFF 3704 2 03 Switch off the machine Danger of injury if the machine is started accidentally Thread the needle thread as show in the above illustration Adjust the needle thread tension by turning milled screw 1 Fig 9 05 1 6 cm ...

Page 39: ...g the needle thread tension on the PFAFF 3704 2 02 Switch off the machine Danger of injury if the machine is started accidentally Thread the needle thread as show in the above illustration Adjust the needle thread tension by turning milled screw 1 Fig 9 06 1 ...

Page 40: ...he setting can be read from scale 3 Set the stitch position by turning stitch position lever 4 L stitch position on left M stitch position in the middle R stitch position on the right M L R 4 3 2 1 Fig 9 07 9 08 Adjusting the stitch length Fig 9 08 1 0 2 3 4 2 1 Adjust the stitch length by turning the feed regulator wheel 1 The setting can be read on scale 2 Fig 9 09 1 2 PFAFF 939 U PFAFF 3704 2 ...

Page 41: ...When sewing without fullness the feed stroke of the main and the differential feed dogs is the same 9 09 02 Ständig Mehrweite einarbeiten Turn adjustment wheel 1 as far as possible in the direction 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 Adjust the stitch length see chapter 9 ...

Page 42: ... length When the left pedal is in its neutral position the machine works with the same feed stroke for the main and differential feed dogs When the left pedal is operated the fullness set on adjustment wheel 1 is worked into the bottom ma terial ply see Chapter 7 03 Pedal on the PFAFF 939 U 9 09 04 Constantly stretch the top material ply Turn adjustment wheel 1 as far as possible in the direction ...

Page 43: ...e with which the machine will usually operate on lever 1 Fullness Set the required deviating value e g for fullness on lever 2 By pressing the knee switch it is possible to switch between the standard value and fullness see Chapter 7 14 Knee switch Setting displayed on display unit 3 Display white fullness Display green standard value 3 ...

Page 44: ...ne into a switching position by operating key 2 Pull adjustment wheel 1 and turn it in the direction of the arrow until it clicks into position Fig 9 14 1 9 11 02 Changing from multi stitch to zigzag stitch Before sewing begins make sure that adjustment wheel 1 is locked in position Only switch over when the machine is at a standstill Danger of machine damage Bring the machine into a switching pos...

Page 45: ...he corresponding key B select the desired value for the number of reverse stitches B of the start backtack By pressing the corresponding key C select the desired value for the number of reverse stitches C of the end backtack By pressing the corresponding key D select the desired value for the number of forward stitches D of the end backtack only on the PFAFF 939 U and the PFAFF 3704 2 03 By pressi...

Page 46: ...eam or counted seam see Chapter 10 01 Darning program or Chapter 10 02 Counted seam Functions in manual sewing also see Chapter 7 16 02 Function keys Start backtacks on off Presser foot raised at end of seam on off End backtacks on off Thread trimming on off Needle position raised on off Darning program on off Presser foot raised on off Counted seam on off Sewing is carried out with the pedal func...

Page 47: ...individual backtack parameters can be altered after the darning program function has been switched off see Chapter 9 12 Entering start and end backtacks or condensed stitches 10 02 Counted seam The corresponding function can be switched on or off directly with the Counted seam key The darning program function is switched off automatically Several counted seam sections can be selected The number of...

Page 48: ...seam programs as well as by overload conditions For an explanation of the error codes see Chapter 12 08 Explanation of the error messages Correct the error Acknowledge error correction by pressing the TE Speed key 10 04 Example of a seam on the PFAFF 3704 2 02 E 9 ERROR top collar condensed stitches condensed stitches subcollar seam segment with fullness seam segment with fullness seam segment wit...

Page 49: ... lubricator Cleaning the air filter lubricator This maintenance interval if for an average machine running time in a single shift operation If the machine running times are longer shorter maintenance intervals are recommended 11 01 Cleaning Switch off the machine Danger of injury if the machine is started accidentally Tilt back the machine head Clean the hook and the hook compartment daily more of...

Page 50: ...oil reservoir 1 up to the upper marking 3 through hole 2 Before operating the machine for the first time or after longer stationary periods add a few additional drops of oil into the hook race see arrow in Fig 11 03 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 Fig 11 02 F...

Page 51: ...ss 2 is full Tighten screw 1 Never allow the oil level to sink below the minimum mark 3 Danger of damage to the machine To fill in larger quantities of oil e g when filling for the first time before commissioning it is better to remove cover 5 Loosen screws 4 and remove cover 5 Take care that no dirt gets into the case Pour in oil until sight glass 2 is full Clean the surface of cover 5 the case a...

Page 52: ...ically when the compressed air hose is disconnected from the air filter lubricator Cleaning filter 2 Unscrew water bowl 1 Take out filter 2 Clean filter 2 with compressed air or isopropyl alkohol part No 95 665 735 91 Screw in filter 2 and screw on water bowl 1 11 05 Checking adjusting the air pressure Before operating the machine always check the air pressure on gauge 1 Gauge 1 must show a pressu...

Page 53: ...ws nuts indicated in brackets are fastenings for machine parts which must be loosened before adjustment and tightened again afterwards The machine must be switched off for all adjustment work Danger of injury if the machine is started accidentally 12 02 Tools gauges and other accessories for adjusting 1 set of screwdrivers with blade widths from 2 to 10 mm 1 set of wrenches with jaw widths from 7 ...

Page 54: ... in the crank behind the bearing plate thus blocking the machine Hole 1 2 0 mm after the bottom dead center of the needle bar 2 0 past tdc Hole 2 Top dead center of the needle bar tdc Hole 3 0 25 mm after the top dead center of the needle bar 0 25 past bdc Hole 4 1 0 mm after the top dead center of the needle bar 1 0 mm past tdc Hole 5 4 mm after the bottom dead center of the needle bar 4 0 past b...

Page 55: ...ar to b d c Adjust the balance weight 1 screw 2 in accordance with the requirement 12 05 Adjusting the basic machine 12 05 01 Balancing weight Requirement With the needle bar at bdc the largest eccentricity of the balancing weight 1 must be pointing upwards ...

Page 56: ...n 1 nut 2 and screw 3 in accordance with the requirement 12 05 02 Centering the needle in the needle hole in sewing direction 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 ...

Page 57: ...rests against eccentric pin 4 turn eccentric pin 4 in accordance with the requirement and tighten nut 3 Push guide bar 5 downwards and then upwards as far as possible Bushing 6 must not move laterally during this movement readjust eccentric pin 4 if necessary Move guide bar 5 until it rests against eccentric pin 4 and tighten screws 1 and 2 12 05 03 Parallel guiding of the needle bar Requirement G...

Page 58: ...adjustment lever 3 must be able to be locked in any position 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 Locking lever 1 must be parallel to the zigzag stitch adjustment lever 3 Tighten screw 2 ...

Page 59: ...laterally Turn the machine off Move screw 5 to the right until it touches and then tighten it Loosen screws 7 and move scale 1 in accordance with requirement 2 Tighten screws 7 Screw 6 remains loose for the following adjustment 12 05 05 Zero stitch and zigzag stitch scale Requirement With the zigzag stitch set at 0 1 the needle bar must not move laterally when the balancewheel is turned and 2 the ...

Page 60: ...e hole crosswise to sewing direction 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 Adjust the eccentric pin 1 nut 2 in accordance with the requirement ...

Page 61: ... largest zigzag value on scale 2 Turn the zigzag stitch adjustment lever 3 in accordance with the requirement Move screw 4 upwards until it touches and then tighten it If the machine is equipped with a needle plate with a smaller hole than is marked on the scale the zigzag limit must be set according to the needle hole width on the needle plate ...

Page 62: ... Multi stitch movement only on the PFAFF 939 U Requirement 1 When the needle at its b d c penetrates on the right hand side the recess 5 on the control cam 3 should be positioned horizontally towards the rear 2 The lateral movement of the needle bar should have been completed when the needle penetrates the workpiece carry out a check with the largest zigzag setting Fig 12 09 1 81 027 2 92 029 4 3 ...

Page 63: ...uirement Make sure that he zigzag eccentric 1 is about 5 mm away from the right inner side of the casting wall Remove the adjustment pin from the bearing plate 12 05 09 Zigzag stitch movement only on the PFAFF 3704 2 Requirement When the needle bar on the right of its throw is positioned at t d c adjustment hole 2 the needle bar should not move laterally when the zigzag stitch adjustment lever is ...

Page 64: ...d penetrate in the centre of the needle hole With the maximum zigzag stitch set the needle should penetrate on the left and right at the same distance from the centre hole Fig 12 11 Let the needle penetrate in the required zigzag settings using paper Without twisting it adjust zigzag eccentric 1 screws 2 in accordance with the requirement 1 2 ...

Page 65: ...ew 3 in accordance with the requirement 12 05 11 Zigzag movement only on the PFAFF 939 U Requirement When the needle bar moving from its right b d c reaches its t d c hole 2 it should not carry out any lateral motion when the zigzag stitch width lever 4 is moved to and fro 81 019 4 2 5 1 3 81 027 4 1 3 2 ...

Page 66: ...3 Adjust sensor 1 screws 2 in accordance with the requirement 12 05 12 Target positioning sensor only on the PFAFF 939 U Requirement There should be a clearance of 0 2 0 3 mm between sensor 1 and control cam 3 1 3 2 0 2 0 3 mm ...

Page 67: ...ch adjustment lever 4 at 0 and move the needle position adjustment lever 3 to the right left until the needle is exactly over the perforations made in the last step For the left needle position bring screw 1 to a position where it touches and tighten it and for the right needle position do the same with screw 2 12 05 13 Needle position adjustment lever Requirement The left and right throws of the ...

Page 68: ...h each other Turn both scale rings in accordance with the requirement and tighten screws 1 12 05 14 Adjustment wheels for differential feed only on the PFAFF 939 U Requirement With guide pin 3 in the middle of the connecting link and the ends of the toothed racks 4 flush with each other the zero markings on the adjustment wheels 5 must be at marking 6 5 6 2 3 1 4 Fig 12 15 ...

Page 69: ... 12 1 Unscrew screw 1 and the needle plate on machines with stitch length N24 Set both adjustment wheels 2 at 0 Loosen screws 3 4 5 6 and 7 Set the maximum stitch length and adjust clamp crank 8 in accordance with the requirement Tighten screws 5 and 6 Turn clamp crank 9 until it is parallel with clamp crank 8 and tighten srews 3 and 4 Turn clamp crank 10 so that it is parallel with the bedplate a...

Page 70: ...he 0 position the two feed dogs 5 should move the same distance when the balance wheel is turned Set the stitch length at 1 5 Set both levers 1 at 0 Loosen screw 2 While constantly turning the balance wheel adjust shaft 3 in accordance with the requirement Bring clamp crank 4 to its top position and tighten screw 2 Fig 12 17 112 012 112 037 1 1 112 038 5 2 4 3 ...

Page 71: ...th the requirement 12 05 17 Position of the stitch length adjustment wheel on the PFAFF 939 U Requirement When adjustment wheel 3 is turned as far forward as possible the pointer 4 should be positioned exactly opposite the mark 0 on scale 5 1 3 2 Fig 12 18 4 5 ...

Page 72: ...quirement 12 05 18 Position of the stitch length adjustment wheel on the PFAFF 3704 2 Requirement When adjustment wheel 1 is turned as far forward as possible the marking for 0 on adjustment wheel 1 and the marking on the reverse feed control should match Fig 12 19 112 013 1 2 ...

Page 73: ...et the stitch length at 0 Fit the open ended spanner width 27 to the torsion spring collar 1 and use it to hold regulating shaft 2 Loosen screw 3 While constantly turning the balance wheel adjust the spanner on the torsion spring collar 1 in accordance with the requirement In this position move adjustment crank 4 against the cast iron frame and tighten screw 3 Carry out a control in accordance wit...

Page 74: ...the stitch length at 0 Fit the open ended spanner width 27 to the torsion spring collar 1 and use it to hold regulating shaft 2 Loosen screw 3 While constantly turning the balance wheel adjust the spanner on the torsion spring collar 1 in accordance with the requirement In this position move adjustment crank 4 against the cast iron frame and tighten screw 3 Carry out a control in accordance with t...

Page 75: ...he stitch length at 0 Set both adjustment wheels 1 at 0 Fit the open ended spanner width 27 to the torsion spring collar 2 and use it to hold regulating shaft 3 Loosen screw 4 While constantly turning the balance wheel adjust the spanner on the torsion spring collar 2 in accordance with the requirement In this position move adjustment crank 5 and crank 6 against the cast iron frame and tighten scr...

Page 76: ...et at the 0 position the differential feed dog 4 should not make any feeding movement when the balance wheel is turned Fig 12 23 Set the stitch length at 0 Set both levers 1 at 0 While constantly turning the balance wheel adjust crank 2 screw 3 in accordance with the requirement Carry out a control check in accordance with the requirement 112 037 1 1 112 039 4 ...

Page 77: ...t 3 4 3 2 1 Fig 12 24 12 05 23 Torsion spring of the reverse feed lever on the PFAFF 939 U Requirement With the presser foot raised the longest stitch length set and the adjustment wheels 4 at 0 the reverse feed lever 5 must return automatically to its uppermost point after being activated 5 ...

Page 78: ...2 05 24 Torsion spring of the reverse feed lever on the PFAFF 3704 2 Requirement With the presser foot raised the longest stitch length set and the adjustment lever 4 at 0 the reverse feed lever 5 must return automatically to its uppermost point after being activated 112 037 4 4 1 2 3 112 051 5 Fig 12 25 ...

Page 79: ...ng nut 3 Fig 12 26 12 05 25 Torsion spring of the differentiation regulating shaft on the PFAFF 939 U Requirement With the presser foot raised the stitch length set at 0 adjustment wheel 4 at 4 5 and adjustment wheel 5 at 0 guide pin 6 must be touching in connecting link 7 4 5 3 2 1 6 7 ...

Page 80: ...3 Fig 12 27 12 05 26 Torsion spring of the differentiation regulating shaft on the PFAFF 3704 2 Requirement When the presser foot is raised the maximum stitch length set lever 4 raised to its top position and lever 5 set at 0 the pointer 6 should be touching lever 4 112 019 3 2 1 112 018 4 5 6 ...

Page 81: ... and differential feed dogs While constantly operating the reverse stitch key adjust the main feeding eccentric 1 screws 2 in accordance with the requirement the cutout on feeding eccentric 1 must be visible While constantly operating the reverse stitch key adjust the differential feeding eccentric 3 screws 4 in accordance with the requirement the cutout on feeding eccentric 3 must be visible Ecce...

Page 82: ...ent With the stitch length set at 0 and the needle bar positioned at 0 25 after t d c hole 3 the feed dogs should be at the top of their stroke 2 1 Fig 12 29 Adjust feed lifting eccentric 1 screws 2 in accordance with the requirement Feed lifting eccentric 1 should not be axially displaced ...

Page 83: ...ght adjustment gauge over their whole length 2 There should be a distance of approx 4 mm between the feed dogs 2 1 3 4 Fig 12 30 Place the feed dog adjustment gauge under the sewing foot with the cutout facing down Lower the sewing foot until it touches the gauge Press up both feed bars and adjust the feed dogs in accordance with requirement 2 Adjust lifting cranks 1 screws 2 and eccentric clamp b...

Page 84: ... accordance with the requirement and so that drive belt 4 is in the centre of bobbin opener drive wheel 3 12 05 30 Drive belt in the gearbox housing Requirement Drive belt 4 must be tightened so that the machine runs freely and the belt sprockets do not have any noticeable play ...

Page 85: ...e right and remove the hook Loosen screw 2 and loosen the draw key underneath it by lightly tapping the head of the screw Screw on the hook bearing bracket adjustment gauge It must be possible to read the numbers 438 439 from the front Move or turn hook bearing bracket 4 in accordance with the requirement Tighten screw 2 Adjust the bobbin case opener in accordance with subsection 12 05 36 Bobbin c...

Page 86: ...ication Requirement When the machine is running at full speed after about 10 seconds a fine oil streak should be visible on a strip of paper held over the needle plate cutout Adjust screw 1 in accordance with the requirement Fig 12 33 1 ...

Page 87: ...ght 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 Fig 12 34 1 Without turning it adjust the needle bar screws 1 in accordance with the requirement 81 019 4 2 5 1 3 81 079 19 mm ...

Page 88: ...nger 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 2 The bobbin case positioning finger must be fitted so that there is a clearance of 0 5 mm between the bottom section of the bobbin case ...

Page 89: ... 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 Fig 12 36 Without turning it adjust the needle bar screws 1 in accordance with the requirement 1 81 081 0 5 mm ...

Page 90: ... is touching clamp crank 3 12 05 36 Bobbin case opener position 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 3 At the left point of reversal of the bobbin case ope...

Page 91: ...in case opener motion 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 12 38 Adjust bobbin opener eccentric 1 screws 2 in accordance with the requirement 81 073 2 3 ...

Page 92: ...tment lever at 0 and the stitch position adjustment lever at centre Let the presser foot drop onto the needle plate and reduce the pressure on the presser bar by turning screws 1 Place the feed dog adjustment gauge under the presser foot with the recess at the bottom Loosen screw 2 and raise hand lever 3 Allow the needle to penetrate the needle hole and align the presser foot in accordance with th...

Page 93: ...ent 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 12 40 2 1 Adjust thread guide bar 1 screw 2 according to the requirement taking care that it is parallel to the bed plate ...

Page 94: ...ace the feed dog gauge under the presser foot with its recess facing downwards Lower the presser foot onto the gauge Loosen nut 1 and turn screw 2 out a few turns Move the knee lever to the right until a noticeable resistance is felt making sure that the presser foot is not lifted off the gauge and hold it at this position Turn screw 2 in as far as it will go then back out by one turn and lock it ...

Page 95: ...05 41 Knee lever play Requirement When lightly pressing the knee lever there should be a noticeable play between nut 1 and fork 3 1 2 3 Adjust nut 1 nut 2 in accordance with the requirement and lock it with nut 2 Fig 12 42 ...

Page 96: ...gulating pin 4 in accordance with requirement 2 and tighten screw 5 12 05 42 Bobbin winder 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 4 5 1 mm 2 1 3 ...

Page 97: ...k 3 screw 4 in accordance with the requirement 12 05 43 Stitch condensation only on the PFAFF 3704 2 02 Requirement When the stitch condensation function is switched on the feed stroke of the main and dif ferential feed dog should be 0 2 0 3 mm 112 021 1 2 3 4 ...

Page 98: ...w 2 and crank 3 screw 4 in accordance with the requirement 12 05 44 Switching to reverse feed only on the PFAFF 3704 2 03 Requirement When the reverse feed function is switched on the actual length of the reverse stitches should correspond to the set stitch length ...

Page 99: ...t throttle 3 in accordance with requirement 2 12 05 45 Thread puller only on the PFAFF 3704 2 02 Requirement The thread puller should 1 draw so much thread that a secure seam start is guaranteed at all times and 2 remain in its end front position until the thread trimming operation is finished 2 2 1 3 ...

Page 100: ...mer 900 24 12 06 01 Axial position of the control cam Requirement 1 Roller 5 should be at a distance of 0 3 mm from the control cam 1 2 Adjustment ring 3 should be touching the control cam 1 Shift control cam 1 screw 2 and adjustment ring 3 screw 4 in accordance with the requirements ...

Page 101: ... Requirement 1 In the needle rise position hole 1 the roller lever 4 should lock into the corresponding groove of the control cam 2 The control cam 1 should be touching adjustment ring 3 Turn control cam 1 screws 2 in accordance with requirement 1 and shift it in accordance with requirement 2 ...

Page 102: ... the edge of the mounting plate 4 Turn linkage rod 1 nuts 2 left and right thread in accordance with the requirement During the cutting test remove linkage rod 1 loosen screws 3 and remove mounting plate 4 Carry out the cutting test with double thread By turning screw 5 adjust the cutting pressure Fit mounting plate 4 so that its edge is flush with the edge of the bed plate Tighten screws 3 and re...

Page 103: ...e hook guard 3 is level with of the right edge of the bobbin case position finger 4 the thread catcher 5 should begin moving forwards 2 The control cam 1 should be touching adjustment ring 6 Bring the needle bar to b d c Turn control cam 1 screws 2 in accordance with requirement 1 and shift it in accordance with requirement 2 ...

Page 104: ...apart 2 When the thread trimmer is in its neutral position and the sewing foot is positioned on the needle plate the tension should be fully effective Fig 12 51 Unscrew the thread wiper Turn nut 1 nut 2 in accordance with the requirements Screw thread wiper back into place On the PFAFF 3704 2 02 both tension units are released 92 047 1 2 3 57 05 0 5 mm 4 ...

Page 105: ...itch on the machine Press the TE Speed key twice to call up the input mode By pressing the corresponding key select the parameter group 798 By pressing the corresponding key select the desired user level 0 operator level A 1 technician level B 11 service level C The selected user level is displayed on the screen see arrow ...

Page 106: ...e By pressing the corresponding plus minus key select parameter 798 and the user level B see Chapter 12 07 01 Selecting the user level Select parameter 607 by pressing the corresponding key Select the required value for the maximum speed by pressing the corresponding key By pressing the TE Speed key the selected value is taken over and the machine switches to the sewing mode ...

Page 107: ...sition 702 Needle position 1 needle lowered B C 0 255 70 26 703 Needle position 2 take up lever raised B C 0 255 222 113 705 Needle position 5 end of cutting signal 1 B C 0 255 196 706 Needle position 6 start of cutting signal 2 B C 0 255 136 60 707 Needle position 9 B C 0 255 150 60 start thread tension release 746 Switchover position from multi stitch B C 0 255 90 90 to zig zag stitch 748 Key al...

Page 108: ...nation of the error signals Signal Description E001 Pedal not in neutral position E009 Start inhibitor during standstill E010 Incorrect machine class E062 Short circuit 24V E063 Overload mains supply circuit E064 Network monitoring E065 Extint low in operation E066 Short circuit E067 Network off E068 Extint low in operation E069 No increments E070 Motor blocking E071 No incremental connector E074 ...

Page 109: ...rE appears for a short time on the screen Resetting the seam programs Press on key B All seam programs are deleted the display rE nA appears for a short time on the screen Cold start Press on key D With the exception of the value for the machine class the values of the machine control unit are set back to their basic values the display COLd appears for a short time on the screen After the cold sta...

Page 110: ...Connect the PC serial interface or appropriate USB adapter and the machine control unit RS232 Switch on the PC and start the PFP boot program Select the machine type Press the programming button An extra program quick loader is started Switch on the machine within 60 seconds The software update is carried out the update progress is shown on the bar display NWhen the update has been completed the m...

Page 111: ...175 690 05 91 000 390 05 91 000 250 15 91 009 026 05 91 225 227 05 3x 11 174 912 15 2x 91 265 227 05 3x 91 167 595 05 91 167 597 91 91 265 225 91 91 168 144 05 91 167 598 41 13 Wearing parts This is a list of the most important wearing parts You can order a detailed spare parts list for the complete machine under part no 296 12 18 603 ...

Page 112: ...13 2 Wearing parts 99 137 151 45 91 171 049 05 91 171 042 05 91 168 499 05 11 180 094 15 91 168 498 15 91 700 249 15 ...

Page 113: ...5 Version 01 10 04 Pneumatics switch diagram 3704 2 02 PFAFF 3704 14 Schaltpläne automatic presser foot lift stitch condensation stitch condensation differential quick change differential thread pulling unit knee switch ...

Page 114: ...Single stitch key S46 Bridge start inhibitor only on the PFAFF 3704 X0 RS232 interface PC X1 Motor X2 Incremental transmitter X3 Set value transmitter X4 Control panel S1 X5 Inputs outputs X6 Bobbin thread monitor optional X7 Light barrier optional X22 900 thread trimmer X24 910 automatic presser foot lift X25 911 backtacking device X28 Thread tension release X40 Keyboard X46 Start inhibitor X50 S...

Page 115: ...14 3 91 191 477 95 Part 1 Version 05 11 03 Circuit diagrams PFAFF 939 U ...

Page 116: ...14 4 Circuit diagrams Version 05 11 03 91 191 477 95 Part 2 PFAFF 939 U ...

Page 117: ...14 5 91 191 477 95 Part 3 Version 05 11 03 Circuit diagrams PFAFF 939 U ...

Page 118: ...14 6 Circuit diagrams Version 03 09 04 91 191 487 95 Part 1 PFAFF 3704 ...

Page 119: ...14 7 91 191 487 95 Part 2 Version 03 09 04 Circuit diagrams PFAFF 3704 Fadenwischer ...

Page 120: ...14 8 Circuit diagrams Version 03 09 04 91 191 487 95 Part 3 PFAFF 3704 ...

Page 121: ...Notes ...

Page 122: ...en AG Postfach 3020 D 67653 Kaiserslautern Königstr 154 D 67655 Kaiserslautern Telefon 0631 200 0 Telefax 0631 17202 E Mail info pfaff industrial com Gedruckt in der BRD Printed in Germany Imprimé en R F A Impreso en la R F A ...

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Pfaff 3704-2/02, Instruction Manual

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