245 1246 Instruction manual This instruction manual applies to machines from the following serial numbers onwards: PFAFF 1245 # 527 678 PFAFF 1246 # 527 679 296-12-18 401/002 Betriebsanleitung engl. 01.
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 permission and with written reference to the source. PFAFF Industrie Maschinen GmbH Postfach 3020 D-67653 Kaiserslautern Königstr.
Index Contents ............................................................................... Chapter - Page 1 1.01 1.02 1.03 1.04 1.05 1.05.01 1.05.02 1.06 Danger ......................................................................................................................... 1 - 4 2 Proper use .................................................................................................................. 2 - 1 3 Specifications ...............................................................
Index Contents ............................................................................... Chapter - Page 8 8.01 8.01.01 8.01.02 8.01.03 8.01.04 8.01.05 8.01.06 8.01.07 8.02 8.02.01 8.02.02 8.03 8.04 9 9.01 9.02 9.03 9.04 9.05 9.06 Mounting and commissioning the machine ........................................................... 8 - 1 Mounting ..................................................................................................................... 8 - 1 Adjusting the table-top height ......
Index Contents ............................................................................... Chapter - Page 11.03 11.04 11.04.01 11.04.02 11.04.03 11.04.04 11.04.05 11.04.06 11.04.07 11.04.08 11.04.09 11.04.10 11.04.11 11.04.12 11.04.13 11.04.14 11.04.15 11.04.16 11.04.17 Abbreviations .............................................................................................................. 11 - 1 Adjusting the basic machine ............................................................................
Safety 1 Safety 1.01 Directives This machine is constructed in accordance with the European regulations contained in the conformity and manufacturer’s declarations.
Safety 1.03 Safety symbols Danger! Points to be observed. Danger of injury for operating and specialist personnel! Caution Do not operate without finger guard and safety devices. Before threading, changing bobbin and needle, cleaning etc. switch off main switch. I 1.04 Important points for the user ● This Instruction Manual is a component part of the machine and must be available to the operating personnel at all times.
Safety 1.05 Operating and specialist personnel 1.05.01 Operating personnel Operating personnel are persons responsible for the equipping, operating and cleaning of the machine as well as taking care of faults arising in the sewing area.
Safety 1.06 Danger A working area of 1 metre 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.
Safety Do not operate the machine without tilt-back safeguard 3! Danger of crushing between upper part and table top! Fig.1 - 02 3 4 Do not operate the machine without belt guards 4 and 5! Danger of injury by the revolving V-belt! 5 Fig.
Proper use 2 Proper use PFAFF 1245 The PFAFF 1245 is a single needle, flatbed sewing machine with bottom, top and needle feeds as well as a large vertical hook for sewing lockstitch seams. The machine is designed for commercial use (industry). PFAFF 1246 The Pfaff 1246 is a two-needle, flat bed sewing machine with bottom, top and needle feed as well as vertical sewing hook for lockstitch seams. The machine is intended for commercial (industrial) use only.
Specifications 3 Specifications 3.01 PFAFF 1245 ◆ Stitch type: ........................................................................................................ 301 (lockstitch) Needle system: .............................................................................................................. 134-35 Needle thickness in 1/100 mm: Model C: ..................................................................................................................... 110 - 140 Max.
Specifications 3.03 Max. number of stitches/min-1 Top feed lift Max. number of -1 Max. number of stitches/min for stitch lengths up to 6 mm stitches/min-1 for stitch lengths from 6 mm to 8 mm less than 3.5 mm 2800 2600 from 3.5 to 5.5 mm 2500 2500 from 5.
Specifications 3.04 PFAFF 1246◆ Stitch type: ........................................................................................................ 301 (lockstitch) Needle system: .............................................................................................................. 134-35 Needle thickness in 1/100 mm: Model B: ...................................................................................................................... 80 - 100 Model C: ...................................
and needle gauge of more than 10 mm Max. number of stitches/min-1 for stitch lengths up to 6 mm to 8 mm and needle gauge of up to 10 mm Max. number of stitches/min-1 for stitch lengths from 6 mm to 8 mm needle gauge of more than 10 mm Max. number of stitches/min-1 for stitch lengths up to 6 mm and needle gauge of up to 10 mm Max. number of stitches/min-1 for stitch lengths up to 6 mm and 3.06 Top feed lift Specifications Max. number of stitches/min-1 less than 3.5 mm 2700 2500 2500 2300 from 3.
Disposal of the machine 4 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. If necessary a specialist is to be commissioned.
Transport packaging and storage 5 Transport packaging and storage 5.01 Transport to the customer’s premises Within the Federal Republic of Germany, the machine is delivered without packaging. Machines for export are packaged in a crate or wrapped depending on how they are transported. 5.02 Transport within the customer’s premises The manufacturer carries no liability for transport within the customer’s premises. Care is to be taken to transport the machine in an upright position only. 5.
Explanation of the symbols 6 Explanation of the symbols In the following section of this Instruction Manual, certain tasks or important pieces of information are accentuated by symbols.
Controls 7 Controls 7.01 On/off switch ● Turn the machine on and off by switching the on/off switch 1 on and off. When the machine is on, the light in the switch is also on. The switch in the illustration can be found on machines with Quick motors. When other motors are 1 used, the switch may not look the same. Fig. 7 - 01 7.
Controls 7.03 Pedal (on machines with automatic presser-foot lifter -910/98) With the on/off switch on 0 = Machine stop +1 = Sew 0 - 1 = Raise presserfoot - 2 = Trim thread (on machines with thread trimmer) +1 -1 -2 Fig. 7 - 03 7.04 Key on the machine head (for machines with backtacking mechanism -911/97) ● Switch to reverse sewing by pressing key 1 while sewing. 1 Fig.
Controls 7.05 Lever for lifting the presser foot ● The sewing foot can be lifted by raising lever 1. 1 Fig. 7 - 05 7.06 Feed regulator / reverse sewing ● Adjust the stitch length by turning the knurled nut 1 accordingly. Reverse sewing ● Press knurled nut 1 upwards as far as possible (position „R“). R 1 Fig.
Controls 7.07 Feed regulator (on machines with backtacking mechanism -911/97) You can set the length of the reverse stitch as large as is required, independent of the 2 forward stitch. ● The forward stitch is set with knurled screw 1 and the reverse stitch with knurled screw 2. The options for setting the automatic start and end bartacks are to be found in the instruction 1 manual of the motor. Fig. 7 - 07 7.
Mounting and commissioning the machine 8 Mounting and commissioning the machine The machine must only be mounted and commissioned by qualified personnel! All relevant safety regulations are to be observed! If the machine is delivered without a table, it must be ensured that the frame and the table top which you intend to use can hold the weight of the machine and the motor, even while sewing. 8.
Mounting and commissioning the machine 8.01.02 Adjusting the V-belt tension ● Loosen nuts 1. ● Tighten the V-belt with belt take-up hanger 2. ● Tighten nuts 1. 2 cm 1 2 Fig. 8 - 02 Fig. 8 - 02 shows a Quick motor. If another motor is used, proceed as described in the motor’s instruction manual. 8.01.03 Mounting the upper V-belt guard If a large balance wheel is used, the corner 1 of the belt guard 3 must be broken out. 1 3 2 4 Fig. 8 - 03 8-2 ● Screw position stop 2 to the belt guard section 3.
Mounting and commissioning the machine 8.01.04 Mounting the lower V-belt guard ● Align belt-guard 7 in such a way that both the motor pulley and the V-belt run freely. ● Tighten screws 8. 8 7 8 Fig. 8 - 04 Fig. 8 - 04 shows a Quick motor. If another motor is used, proceed as described in the motor’s instruction manual. 8.01.05 Mounting tilt-over safeguard ● Screw-mount tilt-over safeguard 1 included in the accessories with screw 2. 2 Fig.
Mounting and commissioning the machine 8.01.06 Mounting the spool holder ● Mount the spool holder as shown in Fig. 8 - 05. ● Insert spool holder in the table-top hole and fasten it by means of the included nuts. Fig. 8 - 05 8.01.07 Mounting the sewing lamp▲ ● Screw the sewing lamp onto the table top (wood screws 5x35) and have it connected by a specialist. ▲ 8-4 The sewing lamp is not included in the normal delivery package.
Mounting and commissioning the machine 8.02 Table top cutout 8.02.
Mounting and commissioning the machine 8.02.
Mounting and commissioning the machine 8.03 Commissioning the machine ● Before commissioning the machine, check the electrical leads and pneumatic hoses for any damage. ● Remove pin 1 of the oil reservoir 2 (Fig. 8 - 06). The pin serves only to protect the machine from damage during transport and must not be used when sewing.
Preparation 9 Preparation All regulations and instructions in this Instruction manual are to be observed! Special attention is to be paid to all Notes on Safety! All preparation work is only to be carried out by appropriately trained personnel. Before all preparation work, the machine is to be switched off via the on/off switch or to beseparated from the electricity supply by removing the plug from the mains! 9.
Preparation 9.02 Inserting the needle in the PFAFF 1246 Turn the machine off! Use only system 134 - 35 needles! ● Loosen needle retaining screws 1. ● Insert needles as far as it will go (the longitudinal needle groove of the left-hand needle must be pointing to the right and that of the right-hand needle to the left). 1 1 ● Tighten needle retaining screws 1. The selection of the correct needle depends on the model of the machine and the material and Fig. 9 - 01a threads being sewn.
Preparation 9.03 Winding the bobbin thread, adjusting the thread tension 4 6 1 3 2 5 Fig. 9 - 02 ● Place an empty bobbin 1 onto bobbin shaft 2. ● Thread the bobbin in accordance with 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 fills up while you are sewing. ● The tension of the thread on bobbin 1 can be adjusted with knurled screw 4.
Preparation 9.04 Removing/Threading the bobbin case 1 2 Turn the machine off! Removing the bobbin case. ● Open the bed slide. ● Raise latch 1 and remove bobbin case 2. Inserting the bobbin case. ● Insert bobbin case 2 so that it clicks into place. ● Close latch 1 and close the bed slide. Fig. 9 - 03 Inserting the bobbin case / Adjusting the bobbin thread tension Turn the machine off! 5 cm 9.05 Threading the bobbin case. ● Thread the bobbin as shown in Fig. 9 - 04.
Preparation 9.06 Threading the needle thread / Adjusting the needle thread tension in the PFAFF 1245 1 Fig. 9 - 05 Turn the machine off! ● Thread the machine as shown in Fig. 9 - 05. Take note that the needle is threaded from the left (see arrow). ● Adjust the needle thread tension by turning knuled screws 1..
Preparation 9.07 Threading the needle thread / Adjusting the needle thread tension in the PFAFF 1246 1 1 Fig. 9 - 06 Maschine ausschalten! ● Thread the machine as shown in Fig. 9 - 06. Care must be taken that the left-hand needle is threaded from the right and the right-hand needle is threaded from the left. ● Adjust the needle thread tension by turning knurled screws 1.
Care and maintenance 10 Care and maintenance 10.01 Servicing and maintenance intervals Check the air pressure ............................................................................. daily before use Clean the hook compartment ........................ daily, more often if in continuous operation Check the water container of the air filter ................................................ daily before use General lubrication .............................................................................
Care and maintenance 10.03 General lubrication 1 Fig. 10 - 02 Only use oil with a mean viscosity of 22.0 mm 2/s at 40°C and a density of 0.865 g/cm3 at 15°C. We recommend PFAFF sewing machine oil. Part no. 280-1-120 144. Fig.
Care and maintenance Turn the machine off! ● Lubricate all bearings marked in Fig. 10.02 twice a week. ● Open the bed slide to gain access to oiling point 1. ● Pull the knee lever out to the front and lay the machine on its back. ● Lubricate all bearings marked in Fig. 10.03 twice a week. Setting the machine upright ● Hold the machine, press tilt safety device 3 (Fig. 10-04) and return the machine to an upright position with both hands. Danger of crushing between machine and table top! 10.
Care and maintenance 10.05 Lubricating the head Turn the machine off! ● Unscrew the face plate. ● Lubricate all bearings and moving parts marked in Fig. 10 - 05 twice a week. ● Screw the face plate back on. Only use oil with a mean viscosity of 22.0 mm2/s at 40°C and a density of 0.865 g/cm3 at 15°C. We recommend PFAFF sewing machine oil. Part no. 280-1-120 144. Fig. 10 - 05 10.06 Lubricating the top-feed drive excentric Turn the machine off! ● Open cover 1 on the back of the machine.
Care and maintenance 10.07 Checking the air pressure ● Before each use of the machine, check 2 the air pressure on gauge 1. ● The gauge must display a pressure of 6 bar. ● If necessary, alter the pressure to this level. ● To do so, lift button 2 and turn it so that the gauge shows a pressure of 6 bar. ● Press button 2 back down again. 1 Fig. 10 - 07 10.08 Emptying / Cleaning the water container of the air filter Turn the machine off! Remove the compressed-air hose from the air filter.
Adjustment 11 Adjustment The illustrations in this section show the PFAFF 1245 single-needle machine. For the PFAFF 1246 two-needle machine, various adjustments must be made twice, i.e. to the left- and right-hand sewing hooks. This will be pointed out in the respective sections, whereby it is often possible to apply the mirror image of the illustrations. 11.
Adjustment 11.04 Adjusting the basic machine 11.04.01 Positioning the feed dog across the direction of sewing Requirement The bottom feed dog must be the same distance from the left and right side of the needleplate cutout. X X 4 1 3 4 2 1 Fig. 11 - 01 ● Loosen screws 1 and 2. ● Laterally align rock shaft 3 in accordance with the requirement. ● Now tighten screws 1. The flat sides of pins 4 must be opposite the flat sides of screws 1 and rock shaft 3 must exhibit neither play nor stiffness.
Adjustment 11.04.02 Positioning the feed dog in the direction of sewing Requirement With the longest stitch set, the bottom feed dog must have the same clearance the front and the back with respect to the needle-plate cutout when feeding both forwards and backwards. X X 2 1 Fig. 11 - 02 ● Set the longest stitch. ● Adjust rock shaft 1 in accordance with the requirement and tighten screws 2.
Adjustment 11.04.03 Height of the bottom feed-dog Requirement With the stitch length set at „0“, the bottom feed dog must protrude over the needle plate as high as the teeth when at TDC. 2 1 Fig. 11 - 03 ● Set stitch length „0“. ● Bring the bottom feed dog to its TDC by turning the handwheel. ● Adjust feed dog carrier 1 (screws 2) in accordance with the requirement. If required, the feed dog height can be reduced a little on machines without a bottom feed lifting phase (without P).
Adjustment 11.04.04 Pre-adjusting the needle height Requirement With the needle bar at BDC, the distance between the needle bar and the needle plate must be 15 mm. 2 1 15 mm Fig. 11 - 04 ● Move needle bar 1 (screw 2) in accordance with the requirement without moving it laterally.
Adjustment 11.04.05 Centering the needle in the needle hole Requirement With the stitch length set at „0“, the needle must enter the needle hole exactly in the middle. 4 3 7 6 8 5 1 9 2 Fig. 11 - 05 ● Unscrew vibrating presser 1 and presser foot 2. ● Set stitch length „0“ and bring the needle bar to its TDC. ● Insert a new needle. Loosen screws 3, 4, 5 and 6. ● Position the needle directly over the bottom feed dog by turning the handwheel. ● Move needle bar frame 7 in accordance with the requirement.
Adjustment 11.04.06 Lifting motion of the bottom feed-dog This adjustment does not apply for machines without a bottom feed lifting phase (without P). Requirement 1. With the needle bar at its BDC, the bottom feed dog must be at its TDC. 2. With the longest stitch set, the bottom feed dog must reach the top surface of the needle plate at the same time as the needle point when the handwheel is turned. 1 2 Fig. 11 - 06 ● Bring the needle bar to its BDC.
Adjustment 11.04.07 Driving motion of the bottom and top feeds Requirement With the longest stitch length set and the needle bar at its BDC, the top and bottom feeds should not move when the reverse-feed lever is activated. 2 1 Fig. 11 - 07 ● Set the longest stitch. ● Loosen screws 1 just far enough so that the feed driving eccentric 2 can be turned on the shaft with difficulty. ● Bring the needle bar to its BDC. ● Turn the feed driving eccentric 2 so that its eccentricity is facing downwards.
Adjustment Hook-to-needle clearance, needle rise, needle height and needle guard (On Model 1246 make these adjustments on both sewing hooks.) Requirement With the stitch length set at „3“ and the needle rise at (1.8 mm after BDC of the needle bar on model „B“ and 2.0 mm after BDC of the needle bar on model „C“), the following must be true: 1. The distance to the needle must be 0.05 - 0.1 mm and the hook point must be pointing to the middle of the needle. 2. The top edge of the eye of the needle must be 0.
Adjustment 1 4 2 1 7 5 56 3 Fig. 11 - 08 adjustable clamp is touching the needle bar bearing. ● Position the hook point at the middle of the needle, taking care to ensure that the needle is not pressed by needle guard 7. ● While ensuring that bevel pinion 5 is not too close, and that the hook does not exhibit too much play, tighten screws 2. ● On machines with automatic thread trimmer -900/56, bring retaining collar 6 to rest on bevel pinion 5 and tighten screws 3.
Adjustment 11.04.9 Top-feed stroke Requirement At the largest top-feed stroke setting and stitch length „0“, presser foot 1 and vibrating presser foot 2 must lift 7.0 mm from the needle plate when the handwheel is turned. 4 7 mm 3 2 7 mm 1 Fig. 11 - 9 ● Set the largest top-feed stroke and the stitch length at „0“. ● Bring presser foot 1 to rest on the needle plate. ● Turn the handwheel in the direction of rotation until vibrating presser foot 2 has reached its highest point.
Adjustment 11.04.10 Lifting motion of the top feed Requirement When presser foot 1 is resting on the needle plate, the vibrating presser foot 4 and the point of the needle must both reach the needle plate at the same time when the top feed stroke is set at maximum. 2 1 3 4 Fig. 11 - 10 ● Allow presser foot 1 to rest on the needle plate. ● Loosen screws 2 until feed lifting eccentric 3 can be turned on its shaft with difficulty. ● Turn feed lifting eccentric 3 in accordance with the requirement.
Adjustment 11.04.11 Bobbin-case opener (On Model 1246 make these adjustments on both bobbin openers.) Requirement The needle thread must not be clamped between the bobbin-case opener 1 and the bobbin-case base 3 nor may it be clamped between projection 4 and the retaining trip of the needle plate (see arrows). 2 4 3 1 Fig. 11 - 11 ● Thread the machine, insert test material and allow the presser foot to rest on the needle plate.
Adjustment 11.04.12 Safety clutch The safety clutch is set by the manufacturer and screws 5 are sealed. If the thread jams, the safety clutch snaps out to prevent damage to the hook. A description of how to snap the clutch back in follows. 2 3 1 4 5 Fig. 11 - 12 ● Remove the jammed thread. ● Press piston 1 and turn the handwheel until hook 3 of pawl 2 clicks into groove 4.
Adjustment 11.04.13 Needle thread tension release Requirement With the presser foot raised, both of the tension discs must be at least 0.5 mm apart. The clearance of 0.5 mm is a minimum and can increase to more than 1 mm when using thick threads. 2 1 0.5 mm 3 Fig. 11 - 13 ● Align pressure plate 1 behind tension carrier plate 2 in accordance with the requirement. If the tension is correct, release pin 3 must not be under pressure.
Adjustment 11.04.14 Thread check spring Requirement The movement of thread check spring 2 must be finished when the needle point enters the material (approx. 7 mm spring path). Due to technical reasons, the length of the thread-check spring path can vary a little in either direction. 7 mm 2 3 1 Fig. 11 - 14 ● Thread the machine, place test material under the presser foot and allow the presser foot to rest on the fabric using the presser foot lifter. ● Loosen screw 1.
Adjustment 11.04.15 Thread check spring on PFAFF 1246 with thread trimmer -900/56 Requirement The motion of thread controller springs 1 and 6 should cease as soon as the needle point penetrates the material (= about 7 mm spring deflection). Due to technical reasons, the length of the thread-check spring path can vary a little in either direction. 8 10 5 7 mm 1 4 6 2 7 9 3 Fig. 11 - 14a ● Turn screw 2 (screw 3) to adjust the spring resistance of thread check spring 1.
Adjustment 11.04.16 Bobbin winder Requirement 1. With the bobbin winder switched on, the bobbin winder spindle must engage reliably. With the bobbin winder switched off, friction wheel 5 must not touch drive wheel 1. 2. The bobbin winder must switch off automatically when the thread level is approximately 1 mm from the edge of the bobbin. 2 1 5 4 1 mm 3 Fig. 11 - 15 ● Move drive wheel 1 (screws 2) in accordance with requirement 1.
Adjustment 11.04.17 Presser-foot pressure Requirement The material must be fed reliably even at top sewing-speed. There mustn’t be pressure marks on the material. 1 Fig. 11 - 16 ● Turn screw 1 in accordance with the requirement.
Adjustment 11.05 Adjusting the thread trimmer -900/56 11.05.01 Pre-adjusting the control cam Requirement 1. The eccentric bearing-surface of control cam 5 must be laterally in the middle of pawl 8. 2. With the take-up lever at its TDC, the beginning of the largest eccentricity of the bearing surface (in the direction of rotation) must be underneath the point of pawl 8. 1 8 3 4 4 5 8 5 6 8 5 2 7 Fig. 11 - 17 ● Remove catch 1 (screws 2). ● Remove plate 3 (screws 4).
Adjustment 11.05.02 Tripping lever Requirement In needle rise position, the flattened pin of control lever 6 (see arrow) must fall slightly into the track of control cam 7 when activating lever 8 is activated. 6 1 2 7 6 5 7 3 4 8 Fig. 11 - 18 ● Screw out screw 1 and swing out connecting rod 2. ● Loosen screws 3 and 4. ● Bring the needle bar to needle rise position by turning the handwheel. ● Bring clamp 5 to rest on the right side of the housing.
Adjustment 11.05.03 Pawl Requirement With the cut-off mechanism in resting position, there must be a distance of 0.3 mm between the largest eccentricity of bearing surface 1 and pawl 2. 0.3 mm 2 1 1 2 3 3 4 Fig. 11 - 19 ● Position the largest eccentricity of bearing surface 1 underneath pawl 2 by turning the handwheel. ● Move bearing bolt 3 (screw 4) in accordance with the requirement.
Adjustment 11.05.04 Engaging solenoid Requirement In needle rise position and with engaging solenoid 5 activated, there must be a distance of 0.3 mm between engaging lever 2 and pawl 3. 3 1 5 2 4 5 0.3 mm Fig. 11 - 20 ● Bring the machine to needle rise position by turning the handwheel. ● Loosen screw 1 until the engaging solenoid can be turned with difficulty. ● Manually activate engaging lever 2 so that pawl 3 engages.
Adjustment 11.05.05 Release trip Requirement In needle rise position and with control lever 4 engaged, there must be a distance of approx. 0.3 mm between the bolt of the control lever and the base of the cam track. 0.3 mm 4 6 5 4 2 6 3 1 Fig. 11 - 21 ● Bring the machine to needle rise position by turning the handwheel. ● Manually activate engaging lever 1 so that pawl 2 engages.
Adjustment Engaging lever Requirement With the needle bar at TDC and with control lever 3 at starting position, there must be a distance of approx. 0.3 mm between bolt 4 and the outer diameter of control cam 5. 0.3 mm 11.05.06 3 4 5 3 5 2 1 Fig. 11 - 22 ● Bring the needle bar to TDC by turning the handwheel. ● Turn screw 1 (nut 2) in accordance with the requirement. ● Carry out a check by tapping control lever 3.
Adjustment 11.05.07 Linkage rod Requirement When shaft 9 begins its sliding motion, lever 6 must simultaneously lift from stop 7. 3 4 6 7 2 1 8 9 5 Fig. 11 - 23 ● Affix spherical head 1 to control lever 3 using screw 2. ● Loosen nuts 4 (right and left handed thread). ● Bring the machine to needle rise position by turning the handwheel and activate engaging lever 5. ● Taking care to ensure that lever 6 is touching stop 7 (see arrow), turn linkage rod 8 in accordance with the requirement.
Adjustment 11.05.08 Final adjustment of the control cam Requirement When control lever 3 is engaged and the needle point is 12 mm above the needle plate coming from its BDC, the motion of the thread catcher 5 must begin. 1 4 3 1 1 2 5 Fig. 11 - 24 ● Bring the take-up lever to just past its TDC by turning the handwheel and loosen the accessible screws on control cam 1.
Adjustment 11.05.09 Catch Requirement With the cut-off mechanism in resting position, there must be a distance of approx. 5 mm between catch 1 and control lever 6. 6 5 4 1 6 5 mm 1 2 3 Fig. 11 - 25 ● Lightly affix catch 1 and cover plate 2 using screws 3. ● Move catch 1 as far as possible in the direction of the arrow and then move it laterally in accordance with the requirement. ● In this position, tighten screws 3. ● Using screws 5, screw plate 4 on.
Adjustment 11.05.10 Connecting rod (for PFAFF 1246 only) Requirement When the cutting device is in the off-position, the length of spacer rod 4 should be equal to the distance between shafts 2 and 3. X 2 3 1 4 1 X Fig. 11 - 25a ● Loosen nuts 1 (right- and left-hand thread) when the cutting device is in the off-position. ● Measure the distance between shafts 2 and 3. ● Rotate connecting rod 4 according to the requirement. ● Re-tighten nuts 1.
Adjustment 11.05.11 Thread-catcher height (On Model 1246 make these adjustments on both thread catchers.) Requirement When thread catcher 2 is pushed forwards manually with the take-up lever at its TDC, the lower point of the thread catcher must pass 1 mm over the back of hook 4. 3 1 2 2 4 0,1 mm 4 Fig. 11 - 26 ● Loosen screw 1 enough so that thread catcher 2 can be turned. ● Loosen the screws in retaining collar 3. ● Bring the take-up lever to its TDC by turning the handwheel.
Adjustment 11.05.12 Knife (On Model 1246 make these adjustments on both knives.) Requirement 1. The elongated hole of knife 3 must be parallel to knife carrier 5 and the knife must not be touching the casting (see arrow). 2. When the point of needle catcher 4 protrudes approx. 3 mm over the cutting edge of the knife, knife 3 must just touch thread catcher 4. 3 2 5 3m m 4 1 Fig. 11 - 27 ● Loosen screws 2. ● Move knife 3 in such a way that it cannot collide with thread catcher 4.
Adjustment 11.05.13 Thread catcher reverse position (On Model 1246 make these adjustments on both thread catchers.) Requirement At the front point of reversal of thread catcher 3, its rear edge must be flush with the cutting edge of knife 4 (see arrow). 4 1 3 4 2 3 Fig. 11 - 28 ● Taking care to ensure that screw 1 is loosened, bring the machine to needle rise position and activate the engaging lever. ● By continuing to turn the handwheel, bring rock shaft 2 to its left point of reversal.
Adjustment ● In this position and taking care to ensure that there is no horizontal play, tighten screw 1.
Adjustment 11.05.14 Bobbin-thread clamp spring (On Model 1246 make these adjustments on both clamp springs.) Requirement 1. Between clamp spring 5 and the bottom of thread catcher 4, there must be a distance of 0.3 mm. 2. At the front point of reversal of thread catcher 4, the points of clamp spring 5 must be flush with the back edge of catcher 4 (see arrow). There must be a distance of approx. 12 mm between the inner edge of clamp spring 5 and guide sleeve 7.
Adjustment ● Bring the machine to needle rise position, activate the engaging lever and bring the thread catcher to its front point of reversal by turning the handwheel. ● Align clamp spring 5 (screws 6) in the elongated hole in accordance with requirement 2 - if necessary carrier 1 (screws 2) as well. ● In this position, and taking care to ensure that carrier 1 is parallel to the machine bedplate, tighten screws 2 and 6. 3 5 12 m m 7 Fig.
Adjustment 11.05.15 Tension release bar Requirement 1. With the cut-off mechanism in resting position and the presser foot raised, there must be a distance of approx. 7 mm between the left edge of release bar 8 and housing 9. 2. When the point of thread catcher 5 is at the same height as the rear edge of stop trip 6 of the needle plate (see arrow) with the presser foot resting on the needle plate, the tension discs must be loosened to such an extent that the needle thread can be easily pulled through them.
Adjustment ● Allow the presser foot to rest on the needle plate. ● By continuing to turn the handwheel, position the point of thread catcher 5 at the same height as the edge of rear stop trip 6 of the needle plate and press release bar 8 to the left in accordance with requirement 2 using retaining collar 7. ● In this position tighten screws 1. The eccentricity of retaining collar 7 must be pointing downwards. ● Carry out a check in accordance with the requirement. 8 6 5 9 1 7 m 7m Fig.
Adjustment 11.05.16 Positioner Requirement When interrupting the sewing process, the machine must position itself at approx. 4 mm after the BDC of the needle bar. After trimming the thread, the machine must position itself at the TDC of the take-up lever. ● Carry out the adjustment as stipulated in the instruction manual of the motor.
Wearing parts 12 Wearing parts This list indicates the most important wearing parts. You can request a detailed parts list for the complete machine under parts number 296-12-18 085.
Wearing parts 99-137 151-45 91-171 049-05 91-171 042-05 91-140 180-91 11-108 006-15 (2x) 91-113 480-91 91-140 726-01 11-130 089-15 (2x) 91-018 885-15 11-130 089-15 (2x) 91-018 147-05 PFAFF 1245; 1246 91-010 937-05 (1245 Version C) 91-010 179-05 (1246 Version B) 91-015 519-05 (1246 Version C) PFAFF 1245-900; 1246-900 91-176 328-05 12 - 2 91-176 328-05
Notes
PFAFF Industrie Maschinen GmbH 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.