® Industrial 918 938 INSTRUCTION MANUAL This instruction manual applies to machines from the following serial numbers onwards: # 2 682 700 296-12-18 600/002 Betriebsanleitung engl. 06.
This Instruction Manual is valid for all models and subclasses listed in the chapter "Specifications ". The reprinting, copying or translation of PFAFF Instruction Manuals, whether in whole or in part, is only permitted with our previous authorization and with written reference to the source. PFAFF Industriesysteme und Maschinen AG Hans-Geiger-Str.
Contents Contents .................................................................................Chapter – Page 1 1.01 1.02 1.03 1.04 1.05 1.05.01 1.05.02 1.06 Safety ........................................................................................................................... 1 - 1 Regulations ................................................................................................................... 1 - 1 2 Proper use ...............................................................
Contents Contents .................................................................................Chapter – Page 8.05 8.06 8.07 8.08 Commissioning ............................................................................................................. 8 - 5 Switching the machine on/off ....................................................................................... 8 - 5 9 9.01 9.02 9.03 9.04 9.04.01 9.04.02 9.04.03 9.05 9.06 9.07 9.08 Setting up .............................................
Contents Contents .................................................................................Chapter – Page 12.05.10 12.05.11 12.05.12 12.05.13 12.05.14 12.05.15 12.05.16 12.05.17 12.05.18 12.05.19 12.05.20 12.05.21 12.05.22 12.05.23 12.05.24 12.05.25 12.05.26 12.05.27 12.05.28 12.05.29 12.05.30 Needle position adjustment lever ................................................................................ 12 - 12 Zero position of the bottom feed dog (with closed gear box) ..........................
Safety 1 Safety 1.01 Regulations This machine is constructed in accordance with the European regulations indicated in the conformity and manufacturer's declarations.
Safety ● Only spare parts which have been approved by us are to be used for repairs! We draw special attention to the fact that spare parts and accessories not supplied by us have not been subjected to testing nor approval by us. Fitting and/or use of any such parts may cause negative changes to the design characteristics of the machine. We shall not accept any liability for damage caused by the use of non-original parts. 1.03 Safety symbols Danger! Special points to observe.
Safety 1.05 Notes for operating and technical staff 1.05.01 Operating staff Operating staff are the persons responsible for setting up, operating and cleaning the machine and for eliminating any malfunctioning in the sewing area. The operating staff is obliged to observe the following points: ● The notes on safety in this instruction manual must always be observed! ● Any working methods, which adversely affect the safety of the machine, must be avoided.! ● Loose-fitting clothing should be avoided.
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 while adjusting the machine settings! Objects can become trapped or be slung away! Danger of injury! 4 1 92-002 1.06 2 3 Fig.
Proper use 2 Proper use The PFAFF 918 U is a high-speed zigzag sewing machine with bottom feed and large hook. The PFAFF 938 U is a high-speed zigzag sewing machine with bottom feed. The machines are used for producing zigzag lockstitch seams in the clothing and linen industry.
Specifications 3 Specifications ▲ Stitch type: ........................................................................................ 304 (zigzag lockstitch) Needle system: ............................................................................................................. 438 Needle size in 1/100 mm: Model A: ...................................................................................................................60 - 70 Model B: ........................................................
Disposal of Machine 4 Disposal of Machine ● Proper disposal of the machine is the responsibility of the customer. ● The materials used for the machine are steel, aluminium, brass and various plastic materials. The electrical equipment comprises plastic materials and copper. ● The machine is to be disposed of according to the locally valid pollution control regulations; if necessary, a specialist ist to be commissioned.
Transportation, packing and storage 5 Transportation, packing and storage 5.01 Transportation to customer's premises The machines are delivered completely packed. 5.02 Transportation inside the customer's premises The manufacturer cannot be made liable for transportation inside the customer's premises nor to other operating locations. It must be ensured that the machines are only transported in an upright position. 5.
Explanation of symbols 6 Explanation of symbols In this instruction manual, work to be carried out or important information is accentuated by symbols.
Controls 7 Controls 7.01 Main switch ● The machine is switched on or off by turning the main switch 1. 77-005 1 Fig. 7 - 01 Keys on the machine head (only on machines with Quick-flange motor) ● As long as key 1 is pressed during sewing, the machine sews in reverse. ● Keys 2 and 3 can be allocated with corresponding parameter settings, see the Motor Instruction Manual. 3 2 1 04 7.02 Fig.
Controls 7.03 Pedal 0 = Neutral position 1 = Sewing 2 = Raise presser foot 3 = Trim thread 0 1 2 3 Fig. 7 - 03 7.04 Lever for raising presser foot ● The presser foot is raised by turning lever 1. 1 Fig.
Controls 7.05 Adjustment lever for zigzag stitch and needle position ● The zigzag stitch adjustment lever 1 is 4 used for adjusting the width of the zigzag stitch. ● To change the position of the adjustment lever, the locking lever 2 must be M L pressed against the adjustment lever 1. R 3 The current zigzag-stitch width can be seen on scale 3. 1 ● By turning the needle-position adjustment lever 4 the required needle position can be set.
Controls 7.07 Stitch length adjustment wheel ● The stitch length can be adjusted by turning the stitch length adjustment wheel 1. The stitch length setting can be read on scale 2. 1 -008 2 Fig. 7 - 07 7.08 Adjustment lever of the underedge trimmer -771/04 ● By pulling and turning lever 1 towards "+", the underedge trimmer is switched on and the knife stroke set. Do not touch the knife while it is running! Danger of injury from the moving knife. 1 Fig.
Controls 7.09 Control panel (only on machines with Quick-flange motor) 2 4 1 3 SPEED TE 3 3 A B ERROR 3 3 C D The control panel consists of display 1 and the function keys described below. The display 1 consists of a single-line alpha-numerical, 7 segment LCD display with 8 symbols. The texts 2, located above and next to the LCD display, show the respective status of the function keys and the operating status of the machine.
Controls Start backtacks ● If this key is pressed, the backtacks at the beginning of the seam (start backtacks) are switched on or off. The number of forward stitches (A) or reverse stitches (B) for the start backtacks can be changed by pressing the +/- key underneath. To convert from double backtack to single backtack set the number of stitches for the corresponding seam section at zero. End backtacks ● If this key is pressed, the backtacks at the end of the seam (end backtacks) are switched on or off.
Installation and commissioning 8 Installation and commissioning The machine must only be installed and commissioned by qualified personnel! All relevant safety regulations must be strictly adhered to! If the machine is delivered without a table, be sure to use a stand and table top that can hold the weight of the machine with its motor. It is very important to ensure that the stand of the machine is firm and steady, also during sewing. 8.
Installation and commissioning 8.01.02 Mounting the upper V-belt guard / Fitting the machine cover ● Slide the left and right halves of the Vbelt guard into place with the slots behind the heads of screws 1 and 2. ● Screw screw 3 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 1 8 9 distance bush 4. ● Tighten screws 1 and 2 (through holes 8 2 6 81-007 5 and 9) and screw 3.
Installation and commissioning 8.02 Fitting the Quick-flange motor. 5 8 7 3 6 2 4 Fig. 8 - 04 1 ● Loosen screws 1 and remove toothed belt wheel 2 from the motor shaft 3. ● Attach bearing plate 4 to the motor 5 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.
Installation and commissioning 8.04 Connect the plug-type connections and earth cable of the Quick-flange motor. 7 6 A 8 B 1 2 7 3 5 90-004 4 Fig. 8 - 06 ● Connect all the plugs 1-5 to the control box as labelled. ● Screw the earth cable from the sewing head and from main switch 6 to earth point A. ● Connect earth point A and earth point B with earth cable 7. ● Screw the earth cable 8 from the motor to earth point B.
Installation and commissioning 8.05 Commissioning ● Examine the machine, in particular the electric cables and pneumatic connection tubes for any damage. ● Clean the machine thoroughly and then oil it. ● Have qualified personnel check whether the machine can be operated with the available voltage and whether it is connected properly in the terminal box. If there are any irregularities do not operate the machine under any circumstances.
Installation and commissioning 8.07 Basic setting of the machine drive unit (only on machines with Quick-flange motor) ● Switch on the machine. 2x 3 3 A B 3 3 C D ● Press TE/Speed key twice to call up the input mode. TE 101 on A ● By pressing the corresponding +/- key, call up parameter "798" and select service level "C", see Chapter 12.08.01 Selecting the user level TE 798 11 C ● By pressing the corresponding +/- key, call up parameter "800" (rotation direction of the motor).
Installation and commissioning TE 700 0 C ● Sew one stitch by operating the pedal. ● Turn the balance wheel in the direction of sewing until the tip of the needle is level with the top edge of the needle plate. ● By pressing the corresponding +/- key, select parameter "702". TE 702 70 C ● By pressing the corresponding +/- key, enter the value "70". ● By pressing the corresponding +/- key, select parameter "703". TE 703 222 C ● By pressing the corresponding +/- key, enter the value "222".
Installation and commissioning 8.08 Mounting/connecting the start inhibitor (only on machines with Quick-flange motor) 1 92-015 2 3 6 Fig. 8 - 09 5 92-013 4 ● 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.
Setting up 9 Setting up All instructions and regulations in this instruction manual must be observed. Special attention must be given to all safety regulations! All setting-up work must only be done by personnel with the necessary training. For all setting-up work the machine must be isolated from its power supply by turning off the on/off switch or removing the machine plug from the electric power socket! 9.
Setting up 9.02 Winding the bobbin thread; adjusting the primary thread tension 4 + 92-018 6 5 3 1 2 Fig. 9 - 02 ● Place an empty bobbin 1 onto bobbin winder spindle 2. ● Thread the bobbin as shown in Fig. 9 - 02 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.
Setting up 9.03 Removing/inserting the bobbin case Turn the machine off! 1 Removing the bobbin case. ● Lift clip 1 and remove bobbin case 2. Inserting the bobbin case: ● Insert bobbin case 1 until you feel it click into place. 2 Fig. 9 - 03 11-04 9.04 Threading the bobbin case, adjusting the thread tension 9.04.01 PFAFF 938 without thread trimmer ● Insert bobbin 1 into bobbin case 2. ● Guide the thread through the slot under spring 3. 1 5 cm ● Adjust the thread tension by turning screw 4.
Setting up 9.04.02 PFAFF 938 with thread trimmer ● Insert bobbin 1 into bobbin case 2. ● Guide the thread through the slot under spring 3. ● Adjust the thread tension by turning screw 4. 1 5 cm When the thread is pulled the bobbin 1 must rotate in the direction of the arrow. 92-055 3 __ 4 + + 2 Fig. 9 - 05 9.04.03 PFAFF 918 ● Pull the thread through the slot under the 5 cm spring as shown in the opposite illustration. ● Adjust the thread tension by turning screw 1.
Setting up Threading the needle thread / Adjusting the needle thread tension 1 + m 6c 92-019 9.05 Fig. 9 - 07 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.
Setting up 9.06 Setting the zigzag stitch and the stitch position ● Set the zigzag stitch width by turning the zigzag lever 1. ● To vary the adjustment press catch 2 4 M L against zigzag lever 1. ● The setting can be read from scale 3. R ● Set the stitch position by turning stitch position lever 4. 3 L = M = R = 1 stitch position on left stitch position in the middle stitch position on the right 2 Fig. 9 - 08 9.
Setting up 9.08 Entering the start and end backtacks ● Switch on the machine. 3 3 A B 3 3 C D ● If necessary switch off the "darning seam" or "counted seam" function, see Chapter 10.01 Darning program or Chapter 10.02 Counted seam. ● By pressing the corresponding +/- key ("A") select the desired value for the number of forward stitches (A) of the start backtack. ● By pressing the corresponding +/- key ("B") select the desired value for the number of reverse stitches (B) of the start backtack.
Sewing 10 Sewing (only on machines with Quick-flange motor) In the sewing mode all relevant settings for the sewing operation are displayed. Functions can be switched on or off by pressing a key. Values for start and end backtacks or stitch placement can be changed directly. When the machine is switched on, the sewing mode is always activated. ● Switch on the machine. 3 3 A B 3 3 C D ● If necessary switch off the function "darning seam" or "counted seam", see Chapter 10.
Sewing 10.01 Darning program 15 15 5 1 A B C 1 The corresponding function can be switched on or off directly with the Darning program key. The "counted seam" function is switched off automatically. Several darning programs with different seam sections A and/or B can be selected. The number of required darning programs can be selected by operating the +/- key 1. The number of stitches for the individual seam sections A and/or B can be selected by operating the corresponding +/- key.
Sewing 10.03 Error messages If a fault occurs, the text "ERROR" appears on the display, together with an error code and short instructions. An error message is caused by incorrect settings, faulty elements or seam programs as well as by overload conditions. For an explanation of the error codes see Chapter 12.10 Explanation of the error messages. ERROR E 9 ● Correct the error. ● Acknowledge error correction by pressing the TE/Speed key.
Care and maintenance 11 Care and maintenance Cleaning ....................................................... daily, several times by continuous operation Checking the oil level (hook oil tank) ............................................................. once a year▲ Checking the oil tank(zigzag eccentric lubrication) .......................... daily, before operation Checking/adjusting the air pressure .......................................
Care and maintenance 11.02 Lubricating the hook 2 3 1 Fig. 11 - 02 Fig. 11 - 03 Turn the machine off! Danger of injury if the machine is started accidentally! Only use oil with a mean viscosity of 10.0 mm2/s at 40°C and a density of 0.847 g/cm3 at 15°C. ● Lay the machine head on its back. ● Fill the oil reservoir 1 up to the upper marking 3 through hole 2.
Care and maintenance 11.03 Oiling the zigzag drive 4 4 5 2 1 3 Fig. 11 - 04 Fig. 11 - 05 Switch off the machine! Danger of injury if the machine is started accidentally! Only use oil with a mean viscosity of 68.00 m2/s at 40° C and a density of 0.881 g/cm3 at 15° C. ● Check the oil level before each operation. ● If necessary, remove screw 1 and fill in oil up to top marking 2. ● Tighten screw 1.
Care and maintenance 11.04 Cleaning the air filter of the air-filter / lubricator Switch the machine off! Disconnect the air hose at the air-filter / lubricator. To drain water bowl 1: ● Water bowl 1 drains itself automatically when the compressed-air hose is disconnected from the air-filter / lubricator. 8 10 6 100 150 4 12 50 200 2 14 230 0 16 0 Cleaning filter 2: ● Unscrew water bowl 1. ● Take out filter 2. ● Clean filter 2 with compressed air or isopropyl alkohol ( part No.
Adjustment 12 Adjustment 12.01 Notes on adjustment All following adjustments are based on a fully assembled machine and may only be carried out by expert staff trained for this purpose. Machine covers, which have to be removed and replaced to carry out checks and adjustments, are not mentioned in the text. The order of the following chapters corresponds to the most logical work sequence for machines which have to be completely adjusted.
Adjustment 12.04 Check and adjustment aid By blocking with holes 1 - 5 the required needle bar positions can be fixed exactly. 4 81-016 3 1 2 92-021 5 Fig. 12 - 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.
Adjustment 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. 1 81-060 2 Fig. 12 - 02 ● Bring the needle bar to b.d.c. ● Adjust the balance weight 1 (screw 2) in accordance with the requirement.
Adjustment 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. 2 1 81-061 3 92-023 Fig. 12 - 03 ● Bring the needle bar to b.d.c. ● Adjust the eccentric pin 1 (nut 2 and screw 3) in accordance with the requirement.
Adjustment Parallel guiding of the needle bar 81-018 Requirement Guide bar 5 must be parallel to the needle bar. 2 3 4 6 4 3 81-019 12.05.03 1 2 5 5 1 Fig. 12 - 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.
Adjustment 12.05.04 Locking lever Requirement The zigzag stitch adjustment lever 3 must be able to be locked in any position. 2 01 2 3 45 6 4 1 3 Fig. 12 - 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. ● Locking lever 1 must be parallel to the zigzag stitch adjustment lever 3. ● Tighten screw 2.
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 marking "0" on scale 1 must be at marking 2. 4 7 1 2 7 3 6 5 Fig. 12 - 06 ● Set the needle position adjustment lever 4 to "middle" and loosen screws 5 and 6. ● Run the machine slowly and turn the zigzag stitch adjustment lever 3 to the right until the needle bar no longer moves laterally. ● Turn the machine off.
Adjustment 12.05.06 Centering the needle in the needle 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. 2 81-062 1 92-022 Fig. 12 - 07 ● Adjust the eccentric pin 1 (nut 2) in accordance with the requirement.
Adjustment 12.05.07 Zigzag stitch width Requirement At the largest zigzag stitch setting, marking 1 must be at the largest zigzag value on scale 2. 2 1 4 3 Fig. 12 - 08 ● 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.
Adjustment 12.05.08 Zigzag stitch movement 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 moved to and fro. 5 mm 4 81-019 3 1 2 5 2 1 Fig. 12 - 09 ● Bring the needle bar, on the right of its throw, to t.d.c. and place the adjustment pin in hole "2" of the bearing plate (locking the machine).
Adjustment 12.05.09 Needle penetration symmetry (left, centre and right) Requirement When the zigzag stitch is set at "0", the needle should 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. 2 1 Fig. 12 - 10 ● 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.
Adjustment 12.05.10 Needle position adjustment lever 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. 3 1 2 4 Fig. 12 - 11 ● Loosen screws 1 and 2. ● Set the needle position adjustment lever 3 to "middle" and the zigzag stitch adjustment lever 4 at the largest zigzag stitch. ● Place a piece of paper underneath the presser foot and perforate it to the left and right with the needle.
Adjustment Zero position of the bottom feed dog (with closed gear box) Requirement With the stitch length set at "0", the bottom feed dog should not carry out any feeding motion when the balance wheel is turned. 1 5 2 4 3 92-032 12.05.11 Fig. 12 - 12 ● Loosen screw 1. ● Fit the fork wrench (SW 27) to the spring clamp ring 2 using it to hold the regulating shaft 3. ● While continually turning the balance wheel, adjust the fork wrench on the spring clamp ring 2 in accordance with the requirement.
Adjustment 12.05.12 Zeroing the bottom feed (with open gearbox) 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. 1 2 3 Fig. 12 - 13 ● Switch on the machine. ● While continuously turning the balance wheel, adjust reversing crank 1 (screw 2) in accordance with the requirement. ● Switch off the machine.
Adjustment Feeding motion of the bottom feed dog 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. 1 2 81-063 12.05.13 Fig. 12 - 14 ● While continuously operating the reverse feed control, adjust feeding eccentric 1 (screws 2) in accordance with the requirement (the counter-sinking in feeding eccentric 1 must be visible).
Adjustment 12.05.14 Lifting motion of the bottom feed dog 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. 1 81-064 2 Fig. 12 - 15 ● Adjust feed lifting eccentric 1 (screw 2) in accordance with the requirement. An axial displacement of feed lifting eccentric 1 is not allowed.
Adjustment 12.05.15 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. 4 3 1 2 Fig. 12 - 16 ● Adjust eccentric bearing bush 1 (screw 2) in accordance with the requirement and so that drive belt 4 is in the centre of bobbin opener drive wheel 3.
Adjustment 12.05.16 Hook bearing bracket Requirement The hook shaft must be touching the hook bearing bracket adjustment gauge 1 at the top and the side. 1 2 438 - 439 81-075 418 - 419 1 81-076 4 3 Fig. 12 - 17 ● Loosen screw 3. ● Swing the bobbin case opener to the 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.
Adjustment 12.05.17 Hook lubrication 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. 1 Fig. 12 - 18 ● Adjust screw 1 in accordance with the requirement.
Adjustment 12.05.18 Pre-adjusting the needle height 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. 4 81-019 3 1 2 5 81-079 1 19 mm Fig. 12 - 19 ● Without turning it, adjust the needle bar (screws 1) in accordance with the requirement.
Adjustment Needle rise, hook-to-needle clearance and bobbin case positioning-finger 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.
Adjustment 12.05.20 Final adjustment of the needle height 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. 81-081 0.5 mm 1 Fig. 12 - 21 ● Without turning it, adjust the needle bar (screws 1) in accordance with the requirement.
Adjustment Bobbin case opener position 81-068 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 opener the bobbin case positioning-finger must be approx. 0.
Adjustment 12.05.22 Bobbin 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. 1 3 81-073 2 Fig. 12 - 23 ● Adjust bobbin opener eccentric 1 (screws 2) in accordance with the requirement.
Adjustment Bottom feed dog height 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. 1 2 1.1 mm 12.05.23 3 4 81-102 Fig. 12 - 24 ● Position the feed dog adjustment gauge underneath the presser foot with the cutout facing downwards. ● Lower the presser foot onto it.
Adjustment 12.05.24 Presser foot to needle plate clearance Requirement When the hand lever is raised, the needle should penetrate exactly in the "needle hole centre" of the presser foot and the presser foot to needle plate clearance should be 7 mm. 3 81-036 2 5 mm 1 81-038 Fig. 12 - 25 ● Set the zigzag stitch adjustment 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.
Adjustment 12.05.25 Needle thread tension release (on machines without -900/24) Requirement When the hand lever is raised, the tensions disks should be at least 0.5 mm apart. 1 4 2 3 0.5 mm 3 Fig. 12 - 26 ● Loosen screw 1 and press linkage rod 2 down as far as possible. ● Raise the presser foot. ● Adjust trip 3 (screw 4) in accordance with the requirement.
Adjustment 12.05.26 Presser foot pressure Requirement Even at top sewing speed the material should be fed without problems. There should be no pressure marks on the material. + - 1 Fig. 12 - 27 ● Turn screw 1 in accordance with the requirement. The presser foot pressure (screw 1) can be increased (+) or reduced (-) as required.
Adjustment Thread diverter pin 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. 2 1 92-040 12.05.27 Fig. 12 - 28 ● Adjust thread guide bar 1 (screw 2) according to the requirement, taking care that it is parallel to the bed-plate.
Adjustment 12.05.28 Limiting the knee lever stroke 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. 2 7 mm 92-041 1 81-038 Fig. 12 - 29 ● ● ● ● Place 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.
Adjustment Knee lever play Requirement When lightly pressing the knee lever there should be a noticeable play between nut 1 and fork 3. 3 1 2 92-042 12.05.29 Fig. 12 - 30 ● Adjust nut 1 (nut 2) in accordance with the requirement and lock it with nut 2.
Adjustment 12.05.30 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. 1 3 1 mm 2 5 4 Fig. 12 - 31 ● Position drive wheel 1 in accordance with requirement 1 and tighten screw 2.
Adjustment 12.06 Adjusting the underedge trimmer -771/04 12.06.01 Resting position of the knife Requirement When adjustment lever 1 is set at "0", the knife stroke should be as small as possible. 1 4 2 65 mm 6 5 3 90° 1 4 9 8 7 Fig. 12 - 32 ● Unscrew the milled screw of adjustment lever 1 (screw 2). ● Remove cover 3 (screws 4). ● Place crank 5 (screws 6) at right angles to the bed plate, and at the same time set a distance of 65 mm between adjustment lever 1 and the bedplate.
Adjustment 12.06.02 Knife height Requirement When the adjustment lever 1 is set at "0" and the knife is at the top of its stroke, the top edges of the needle plate and knife should be at the same level. 1 3 4 2 Fig. 12 - 33 ● Set adjustment lever 1 at "0". ● Remove cover cap 2 and turn the motor impeller wheel until the knife is positioned at its t.d.c. ● Adjust linkage rod 3 (screw 4) in accordance with the requirement.
Adjustment 12.06.03 Positioning of the knife Requirement The knife should be touching the counter blade and be positioned at a slight slant to the stationary knife. 1 2 Fig. 12 - 34 ● Adjust eccentric 1 (screw 2) in accordance with the requirement.
Adjustment 12.06.04 Knife drive switch Requirement When the adjustment lever 1 is set at "0", the knife drive unit must be switched off, and from position "1" on it must be switched on. 4 2 3 1 Fig. 12 - 35 ● Set adjustment lever 1 at "0". ● Turn lever 2 (screw 3) until it pushes switch 4. ● Set adjustment lever 1 at "1". ● Check the setting in accordance with the requirement, and adjust lever 2 if necessary.
Adjustment 12.06.05 Workpiece guard Requirement Workpiece guard 1 should be as close as possible to the knife 3 and be touching stop 4. 3 2 1 4 Fig. 12 - 36 ● Adjust workpiece guard 1 (screws 2) in accordance with the requirement.
Adjustment 12.07 Adjusting the thread trimmer -900/24 12.07.01 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. 1 2 3 4 5 0.3 mm 92-043 81-048 Fig. 12 - 37 ● Shift control cam 1 (screw 2) and adjustment ring 3 (screw 4) in accordance with the requirements.
Adjustment Preliminary adjustment of the control cam 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. 1 2 3 4 81-049 92-043 12.07.02 Fig. 12 - 38 ● Turn control cam 1 (screws 2) in accordance with requirement 1 and shift it in accordance with requirement 2.
Adjustment 12.07.03 Position of the thread catcher and cutting test Requirement When the thread trimmer is in its neutral position, the edge of thread catcher 6 should be flush with the edge of the mounting plate 4. 4 3 6 1 3 2 81-100 92-044 5 Fig. 12 - 39 ● 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.
Adjustment Readjustment of the control cam Requirement 1. When the end of the 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. 5 2 1 6 81-044 3 4 92-045 12.07.04 81-098 Fig. 12 - 40 ● 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.
Adjustment 12.07.05 Needle thread tension release Requirement 1. When solenoids 3 are activated, the tensions disks 4 should be at least 0.5 mm 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. 1 2 92-047 3 0.5 mm 4 ● Unscrew the thread wiper. ● Turn nut 1 (nut 2) in accordance with the requirements. ● Screw thread wiper back into place. 12 - 42 92-013 57-05 Fig.
Adjustment 12.08 Parameter settings 12.08.01 Selecting the user level ● Switch on the machine. 2x 3 3 A B 3 3 C D ● Press the TE/Speed key twice to call up the input mode. TE 101 on A ● By pressing the corresponding +/- key select the parameter group "798". TE 798 0 A ● By pressing the corresponding +/- key select the desired user level: "0" "1" = = "11" = operator level A technician level B service level C The selected user level is displayed on the screen.
Adjustment 12.08.02 Example of a parameter input ● Switch on the machine. 2x ● Press the TE/Speed key twice to select the input mode. TE 101 on A B C D ● By pressing the corresponding plus/minus key select parameter "798" and the user level "B", see Chapter 12.08.01 Selecting the user level. TE 798 1 B ● Select parameter "607" by pressing the corresponding +/- key. TE 607 4500 B ● Select the required value for the maximum speed by pressing the corresponding +/- key.
Adjustment A, B, C ON 6 605 Speed display (0FF = AUS, ON = EIN) B, C OFF 607 Max.
Adjustment Reset / Cold start 12.09 After selecting the reset menu, by pressing the corresponding key it is possible to delete seam parameters, delete seam programs and to carry out a cold start. A D ● Press and hold "+" on keys A and D and switch on the machine, see Chapter 7.01 Main switch. 1_ 2 _ _ _ 3 _ A A B D Resetting the seam parameters ● Press "+"on key "A". All parameters are deleted, the display "—rE—" appears for a short time on the screen.
Adjustment 12.
Adjustment 12.11 Internet update of the machine software The machine software can be updated with PFAFF flash programming. For this purpose the PFP boot program and the appropriate control software for the machine type must be installed on a PC. To transfer the data to the machine, the PC and the machine control unit must be connected with an appropriate null modem cable (part no. 91-291 998-91).
Wearing parts 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. 296-12-18 600.
Wearing parts PFAFF 938 91-265 225-91 91-168 144-05 91-265 227-05 (3x) 91-167 595-05 11-174 912-15 (2x) 91-175 690-05 91-225 227-05 (3x) 91-009 026-05 91-167 597-91 91-000 250-15 91-000 390-05 99-137 151-45 91-171 049-05 91-171 042-05 91-168 498-15 91-700 249-15 91-168 499-05 11-180 094-15 13 - 2
Circuit diagrams 14 Circuit diagrams Reference list for circuit diagrams A1 Controller Quick P40 ED A2 Control panel S1 A14 Sewing head identification H1 Sewing lamp H10 LED Stitch counter M1 Sewing motor Q1 Main switch S1 Pedal set value transmitter S41 Manual backtacking S42 Needle position change key S43 Single stitch key S46 Start inhibitor key X0 RS232 interface (PC) X1 Motor X2 Incremental transmitter X3 Set value transmitter X4 Control panel S1 X5 Inputs/outputs X
General plan – circuit diagrams 14 - 2 Version 10.03.
91-191 469-95 Part 2 Version 10.03.
General plan – circuit diagrams 14 - 4 Version 10.03.
Notes
Hans-Geiger-Str. 12 - IG Nord D-67661 Kaiserslautern Phone: Fax: E-mail: +49 - 6301 3205 - 0 +49 - 6301 3205 1386 info@pfaff-industrial.com Hotlines: Technical service: Application consultance: Spare-parts hotline: Printed in Germany +49 - 175/2243-101 +49 - 175/2243-102 +49 - 175/2243-103 © PFAFF Industriesysteme und Maschinen AG 2009, PFAFF is the exclusive trademark of VSM Group AB.PFAFF Industriesysteme und Maschinen AG is an authorized licensee of the PFAFF trademark.
