Central. bobbin sewing machine with cam take-up (21 pages)
Summary of Contents for Pfaff 571
Page 1
ADJUSTMENT MANUAL This adjustment manual applies to machines from the serial number 7 260 186 and adjustment manual 0435/002 onwards. 296-12-19 305/002 Adjustment Manual engl. 08.15...
Page 2
Reprinting, reproduction and/or translation of PFAFF adjustment manuals (including parts thereof) is only permitted with our prior agreement and citation of the source. PFAFF Industriesysteme und Maschinen GmbH Hans-Geiger-Str. 12 - IG Nord D-67661 Kaiserslautern Germany...
Abbreviations ........................5 Explanation of symbols ....................... 5 Adjusting the basic machine ....................6 .04.01 Needle position in sewing direction (on the PFAFF 571 and 591) ......... 6 .04.02 Needle position in sewing direction (on the PFAFF 574) ............7 .04.03 Needle height (pre-calibrating) ....................
Page 4
Linkage rod (only on the PFAFF 574) ..................51 Adjust backtacking mechanism -911/................52 .07 .01 Needle in needle hole (on the PFAFF 571 and 591) ............. 52 .07 .02 Clutch for roller presser drive ....................53 .07 .03 Adjust roller presser drive ....................
Adjustment Adjustment Observe and comply with all instructions in the operating manual's chapter 1 Safety! In particular make sure that all safety covers are installed again correctly after making adjustments, see chapter 1.06 Operating manual hazard information! Unless otherwise stated, the machine must be disconnected from the electric supplies before all adjustment work! Risk of injury due to accidental machine start-up! Notes on adjustment...
Adjustment Adjusting the basic machine Needle position in sewing direction .04.01 (on the PFAFF 571 and 591) Rule The needle should be at the centre of the stitch hole looking in the sewing direction with minimum stitch length regulation. Fig. 13 - 01 ...
Adjustment Needle position in sewing direction .04.02 (on the PFAFF 574) Rule The needles should be at the centre of the stitch hole looking in the sewing direction. Fig. 13 - 02 Adjust the needle bar frame (screws 1 and 2) according to the rule.
Adjustment Needle height .04.03 (pre-calibrating) Rule At TDC there should be a clearance of approx. 21 mm between the needle bar and the needle plate. 21 mm Fig. 13 - 03 Adjust the needle bar 1 (screw 2) without twisting according to the rule.
Adjustment Hook-to-needle clearance, needle bar rise, needle height and needle guard .04.04 (on the PFAFF 571) Rule With the needle rise positioned 2.4 mm after BDC of the needle bar and with stitch length regulation "0" 1. the hook point should be at the needle midpoint, and should be at a distance of 0.05 to 0.1 mm to the needle,...
Adjustment Hook-to-needle clearance, needle bar rise, needle height and needle guard .04.05 (on the PFAFF 574) Rule On both hooks with the needle rise positioned 2.4 mm after BDC of the needle bar, 1. the hook point should be at the needle midpoint, and should be at a distance of 0.05 to 0.1 mm to the needle,...
Page 11
Adjustment Adjust both hook posts according to rule 1 and tighten the screws 8. Tighten the screws 1 and 6. Tighten the screws 3 and 5 allowing for bevel gear wheel movement. Adjust the retaining collar 10 up against the bevel gear 11 and tighten the screws 2. ...
Adjustment Hook-to-needle clearance, needle bar rise, needle height and needle guard .04.06 (on the PFAFF 591) Rule With the needle rise positioned 2.4 mm after BDC of the needle bar and with stitch length regulation "0" 1. the hook point should be at the needle midpoint, and should be at a distance of 0.05 to 0.1 mm to the needle,...
Adjustment Needle position crossways to sewing direction .04.07 (on the PFAFF 571) Rule The needle should be at the centre of the stitch hole when entering and exiting the needle plate with maximum stitch length regulation. Fig. 13 - 07...
Adjustment Needle position crossways to sewing direction .04.08 (on the PFAFF 574) Rule The needles should pierce the middle of their stitch holes looking crossways to the sewing direction. Fig. 13 - 08 Adjust the mounting plate 1 (screws 2, on both sides of the post) according to the rule.
Adjustment Needle position crossways to sewing direction .04.09 (on the PFAFF 591) Rule The needle should pierce the middle of the stitch hole looking crossways to the sewing direction. Fig. 13 - 09 Adjust the feed wheel post 1 (screws 2, 3 and 4) according to the rule.
Turn the bobbin case opener 1 (screw 2) according to rule 2. The settings should be repeated on the right post on the PFAFF 574. The setting may differ from rule 2 depending on the thread thickness.
Adjustment Feed wheel height .04.11 (on the PFAFF 571) Rule 1. The feed wheel 4 to which pressure is applied should protrude out of the needle plate by the tooth height (approx. 0.8 mm). 2. The feed wheel 4 to which no pressure is applied should have approx. 0.3 mm height clearance.
Adjustment Feed wheel height .04.12 (on the PFAFF 574) Rule 1. When pressure is applied to the feed wheel 4, it should protrude from the needle plate by the tooth height (approx. 0.8 mm). 2. The feed wheel 4 to which no pressure is applied should have approx. 0.3 mm height clearance.
Adjustment Feed wheel height .04.13 (on the PFAFF 591) Rule The feed wheel should protrude out of the needle plate by the tooth height (approx. 0.8 mm). Fig. 13 - 13 Swivel out the roller presser. Loosen the screws 1.
Adjustment Reverse-feed lever eccentric .04.14 Rule If the needle (at the maximum stitch length setting) is 3 mm above the needle plate from the top dead centre position, the crank 3 should have reached its front turning point posi- tion. Fig.
Adjustment Stitch length scale dial .04.15 Rule The marking line should be on the scale dial 1 opposite the lower edge 3 of the belt guard recess if the reverse-feed lever is engaged and in stitch length setting "0". Fig. 13- 15 ...
Shaft crank for feed wheel drive .04.16 Rule The connecting rod 3 or the connecting rods 3 and 4 on the PFAFF 571 and 591 should be able to move freely when turning the handwheel with maximum stitch length regulation. PFAFF 571...
Adjustment Shaft crank for roller presser drive .04.17 Rule The connecting rods 3 and 4 should be able to move freely in their left and right turning point position with maximum stitch length regulation. Fig. 13 - 17 Set the maximum stitch length. ...
Adjustment Clearance between roller presser and feed wheel .04.18 Rule When the hand lever is raised, the clearance between roller presser and feed wheel should be 7 mm Fig. 13 - 18 Raise the hand lever. Adjust the presser bar 1 (screws 2) according to the rule. Take care that the roller presser is parallel to the feed wheel.
If the roller presser 1 is fi tted to the feed wheel 5, it should 1. be parallel to the feed wheel 5 looking in the sewing direction, 2. be positioned at the centre of the needle (the left needle on the PFAFF 574) looking in the sewing direction, 3.
Rule With a stitch length setting of "3" and after 11 punctures in a strip of leather, the overall length from the fi rst to the last puncture should be 30 mm. PFAFF 571 PFAFF 591 PFAFF 574 Fig. 13 - 20 ...
Adjustment Synchronisation of roller presser and feed wheel .04.21 Rule After approx. 30 stitches in a strip of leather, the overall length from the fi rst to the last puncture should be the same length on the lower and upper leather layer. Fig.
Adjustment Press pad .04.22 (only on the PFAFF 574) Rule The press pad 1 should 1. be as close as possible to the needle looking in the sewing direction and 2. be positioned at the centre of the needle looking crossways to the sewing direction.
Adjustment Knee lever .04.23 Rule 1. Before the roller-presser raises up, the knee lever should have a little bit of clearance. 2. The lever for the roller presser should lower automatically when the knee lever is acti- vated until you feel it stop. 3.
Adjustment Release needle thread tension .04.24 Rule 1. When the hand lever is raised, the tension discs 3 should be pushed apart by at least 0.5 mm. 2. The tension must be fully activated when fi tting the roller presser. 0.5 mm Fig.
Adjustment Thread check spring .04.25 (on the PFAFF 571 and 591) Rule 1. The movement of the thread check spring 3 should be fi nished when the needle point punctures the material (spring defl ection approx. 7 mm). 2. The thread check spring 3 should lift slightly off the support 1 when forming the maxi- mum thread loop while passing the thread around the hook.
Adjustment Thread check spring .04.26 (on the PFAFF 574) Rule 1. The movement of the thread check spring 3 should be fi nished when the needle points puncture the material (spring defl ection approx. 7 mm). 2. The thread check spring 3 should lift slightly off the support 1 when forming the maximum thread loops while passing the thread around the hook.
Adjustment Bobbin winder .04.27 Rule 1. When the bobbin winder is switched on, the bobbin winder spindle should be moved easily; when the bobbin winder is switched off, the friction wheel 5 must not touch the drive wheel 1. 2. The bobbin winder should switch off automatically when the fi ll amount is still around 1 mm from the edge of the bobbin.
Adjustment Roller presser pressure .04.28 Rule The material should be transported properly even at top sewing speed. No pressure marks should appear on the material. Fig. 1 - 28 Turn the screw 1 according to the rule. The screw 1 is located under the cover.
Adjustment Lubrication .04.29 Rule After 10 seconds operation, a light oil strip should appear on a paper strip held to the hook foot. Fig. 13 - 29 Check whether the oil has been added and the oil tubes are free of air. ...
Adjustment Re-engage safety clutch .04.30 The clutch 1 is set ex works. If the thread jams, the clutch 1 disengages to avoid damage to the hooks. The process to engage the clutch 1 is described below. Fig. 13 - 30 ...
Adjustment Adjust edge trimmer -725/04 Knife carrier position .05.01 (on the PFAFF 571) Rule When the edge trimmer is switched on and the adjusting wheel 1 is turned until you feel it reach the upper stop, 1. the knife carrier 2 should be parallel to the post and 2.
Adjustment Knife carrier position .05.02 (on the PFAFF 591) Rule When the edge trimmer is swung in, the centre of the knife angle should be at the same level as the upper edge of the needle plate. Fig. 13 - 32 ...
Adjustment Knife stroke .05.03 (on the PFAFF 571) Rule The knife stroke can be set within a range of 1.0 to 3.5 mm to optimally suit all materials used. Fig. 13 - 33 Turn the eccentric 1 (screws 2) so that the marking of the desired cutting stroke is...
Adjustment Knife stroke .05.04 (on the PFAFF 591) Rule The knife stroke can be set within a range of 2.0 to 3.5 mm to optimally suit all materials used. Fig. 13 - 34 Adjust the crank 1 (nut 2) in the slotted lever 3 according to the rule.
Adjustment Knife movement .05.05 (on the PFAFF 571) Rule When the edge trimmer is swung in and the needle is in the needle hole, the movement of the knife 1 should be half way in front of and half way behind the needle when turning the motor shaft manually.
Adjustment Knife movement .05.06 (on the PFAFF 591) Rule When the edge trimmer is swung in and the needle is in the needle hole, the movement of the knife 3 should be half way in front of and half way behind the needle when turning the motor shaft manually.
When the edge trimmer is swung in, the knife should touch the needle plate insert lightly, whereby no whistling sound should occur during the trimming. Fig. 13 - 37 PFAFF 571 Turn the screw 1 (screw 2) according to the rule. Carry out a test cut and maybe repeat the adjustment.
Adjustment Adjust thread trimmer -900/83 Roller lever neutral position / control cam radial position .06.01 Rule 1. When the thread trimmer is in the neutral position, the lever 5 should fi t closely to the plunger 6 and the roller on the roller lever 7 should be 0.3 mm away from the control cam 3.
Adjustment Thread catcher carrier position .06.02 Requirement 1. There should be a minimum amount of play between the pinion 3 and the toothed segment 4. 2. The clearance between the toothed segment 4 and the outer edge of the thread catcher carrier 1 should be the same size (see arrow) in both the neutral position and the front turning point position of the catcher.
Adjustment Thread catcher position .06.03 Rule 1. The lower edge of the thread catcher 1 should be 0.1 mm away from the horn of the bobbin case 5. 2. When the thread trimmer device is in the neutral position, the front edge of the thread catcher 1 should be fl...
Adjustment Knife position and knife pressure .06.04 Rule The knife pressure should be set as low as possible and the cutting operation should be completed safely. Fig. 13 - 41 Adjust the eccentric 1 (screws 2) according to the rule.
Adjustment Bobbin thread clamp spring .06.05 Rule The spring tension of the bobbin thread clamp spring should be as low as possible but clamp the bobbin thread securely after the cutting operation. Fig. 13 - 42 Adjust the bobbin thread clamp spring 1 (screw 2) according to the rule. Check ...
Adjustment Manual test cut .06.06 Rule 1. The thread catcher 1 must not push the bobbin thread 3 in front of it during its forward movement. 2. The bobbin thread 3 should be caught securely by the hook 4 in the front turning point position of the thread catcher 1.
Adjustment Tension release .06.07 Rule When the magnet is activated, the tension discs 3 should be at least 0.5 mm away from each other. 0.5 mm Fig. 13 - 44 Activate the magnet. Unscrew the tension mounting plate 1 and align the pressure plate 2 according to the rule.
Adjustment Linkage rod .06.08 (only on the PFAFF 574) Rule The driving levers 1 should be parallel when the thread trimmer is the neutral position. Fig. 13 - 45 Adjust the driving levers 1 (screws 2) according to the rule.
Adjust backtacking mechanism -911/.. Needle in needle hole .07 .01 (on the PFAFF 571 and 591) Rule The needle should have the same clearance to the inner edge of the needle hole for for- ward and reverse stitches with maximum stitch length regulation.
Adjustment Clutch for roller presser drive .07 .02 Rule 1. There should be no play between the cross joint 2 and the connecting rod 1. 2. There should be a clearance of 3 mm between the cross joint 2 and the mounting 3 when the roller presser is secured.
Adjustment Adjust roller presser drive .07 .03 Rule 1. Adjust the bevel gears 5.2 and 3 into their position; there must be minimal play be- tween the bevel gears 5.2 and 3. 2. The bevel gear 3 and bevel gear 4 are engaged when sewing forwards; the bevel gears 5.2.3 and 4 must move at the same time.
Adjustment Bevel gears for feed crank drive .07 .04 Rule 1. Adjust the bevel gears 5.2 and 3 into their position; there must be minimal play be- tween the bevel gears 5.2 and 3. 2. The bevel gear 3 and bevel gear 4 are engaged when sewing forwards; the bevel gears 5.2.3 and 4 must move at the same time.
Adjustment Adjust switching magnet for feed crank drive .07 .05 Rule When sewing backwards, the crank 1 must be in its left position and the magnet lever 2 must be at its maximum lift to reach the crank 1 exactly. Fig.
Adjustment Adjust switching magnet for feed crank drive .07 .06 (on-725/04) Rule When sewing backwards, the crank 1 must be in its left position and the magnet lever 2 must be at its maximum lift to reach the crank 1 exactly. ...
The "DongleCopy" PC tool is needed to upload software onto the dongle. A description of how to perform an Internet update of control P40 CD as well as the "DongleCopy" PC tool can be downloaded from the Internet address https://partnerweb.pfaff-industrial.com/.