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Pfaff 1425 Instruction Manual

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1425
1426
Instruction Manual
96-12-18 092
Betriebsanleitung engl. 10.98

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Summary of Contents for Pfaff 1425

  • Page 1 1425 1426 Instruction Manual 96-12-18 092 Betriebsanleitung engl. 10.98...
  • Page 2 This instruction manual applies to all versions and subclasses listed under "Specifications". 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.

  • Page 3: Table Of Contents

    Danger warnings ....................... 1 - 4 Proper use ........................ 2 - 1 Specifications ......................3 - 1 PFAFF 1425, PFAFF 1426 ..................3 - 1 Possible work aids ....................3 - 2 Machine disposal ..................... 4 - 1 Transportation, packing and storage ..............5 - 1 Transportation to customer's premises ..............

  • Page 4: Contents

    Bobbin-changing/threading, and regulating the bobbin thread tension ..... 9 - 4 Threading needle thread and regulating its tension on the PFAFF 1425 ....9 - 5 Threading needle threads and regulating tensions on the PFAFF 1426 ....9 - 6 Setting the stitch length ....................
  • Page 5 Knife pressure ......................11 - 40 .06.06 Bobbin-thread retaining spring ................11 - 41 .06.07 Thread-catcher transmission crank (only on PFAFF 1426 ) ........11 - 42 .06.08 Transmission linkage (only on PFAFF 1426 ) ............11 - 43 .06.09 Manual cutting test ....................

  • Page 6: Safety

    Safety Safety Regulations This machine is constructed in accordance with the European regulations indicated in the conformity and manufacturer's declarations. In addition to this instruction manual, please also observe all generally accepted, statutory and other legal requirements, including those of the user's country, and the applicable pol- lution control regulations! The valid regulations of the regional social insurance society for occupational accidents or other supervisory authorities are to be strictly adhered to!

  • Page 7: Safety Symbols

    The user must ensure that none of the safety devices are removed nor put out of work- ing order. The user must ensure that only authorized persons operate and work on the machine. For further information please refer to your PFAFF agency. 1 - 2...

  • Page 8: Notes For Operating And Technical Staff

    Safety Notes for operating and technical staff Operating staff .05.01 Operating staff are the persons responsible for setting up, operating and cleaning the mach- ine and for removing any disturbances in the sewing area. The operating staff are obliged to observe the following points, and must: always observe the notes on safety in this instruction manual! avoid using any working methods which adversely effect the safety of the machine! avoid wearing loose-fitting clothing or jewelry such as necklaces or rings!

  • Page 9: Danger Warnings

    Safety Danger warnings A working area of 1 m must be kept free both in front of and behind the mach- ine, so that easy access is possible at all times. Never put your hands in the sewing area during sewing! Danger of injury by the needle! While setting or adjusting the machine do not leave any objects on the table nor in the needle plate area! Objects may be trapped or slung out of the mach-...

  • Page 10: Proper Use

    Proper use Proper use The PFAFF 1425 is a special single-needle high-speed lockstitch seamer with unison feed and large sewing hook. The PFAFF 1426 is a special two-needle high-speed lockstitch seamer with unison feed and large sewing hook. These machines are intended for sewing lockstitch seams in the textile industry.

  • Page 11: Specifications

    Model CN8: ........................ 8 mm Noise level at workplace at a speed of 2800 r.p.m. (2400 s.p.m), PFAFF 1425: ........≤ 78 dB ( A ) at a speed of 2800 r.p.m. (2400 s.p.m.),PFAFF 1426: ........≤ 80 dB ( A ) Noise measurement according to DIN 45635-48-A-1 Net weight of sewing head, PFAFF 1425: .............

  • Page 12: Possible Work Aids

    Specifications Possible work aids -731/02 ......................Edge trimmer -900/81 ......................Thread trimmer -910/04 ..................Automatic presser foot lift -911/35 ..................Backtacking mechanism -918/29 ........Quick-change stepping control and stitch-length adjustment -926/06 .................. Bobbin thread supply monitor 3 - 2...

  • Page 13: Disposal Of Machine

    Disposal of Machine 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 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;...

  • Page 14: Transportation, Packing And Storage

    Transportation, packing and storage Transportation, packing and storage Transportation to customer's premises Within the Federal Republic of Germany, complete machines (with table and motor) are delivered without packing. Machines without table (only sewing heads) and machines intended for exports are packed. Transportation inside the customer's premises The manufacturer cannot be made liable for transportation inside the customer's premises nor to other operating locations.

  • Page 15: Explanation Of Symbols

    Explanation of symbols Explanation of symbols In this instruction 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) 6 - 1...

  • Page 16: Controls

    Controls Controls On/off switch Switch machine on or off by turning on/- off switch 1. Fig. 7 - 01 Keys on machine head The keys on the machine head are pres- sed to set off certain functions. Key 1: Reverse sewing or intermediate backtack within the seam Key 2: Raisei needle...

  • Page 17: Pedal

    Controls Pedal 0 = Neutral position 1 = Sewing 2 = Raise presser foot 3 = Trim sewing threads For other pedal functions please refer to the instruction manual of the motor manufacturer. Fig. 7 - 03 Knee switch By operating knee switch 1 it is possible to alternate between two pre-selected feed stroke settings.

  • Page 18: Presser Foot Fixing Key

    Controls Presser foot fixing key To fix the presser foot, raise it with the pedal, then press key 1 and release the pedal again. To release the presser foot, raise it briefly with the pedal. Fig. 7 - 05 Stitch-length setting Feed regulator disks1 und 2 are for setting the stitch length.

  • Page 19: Reverse-Feed Control

    Controls Reverse-feed control To sew in reverse, press reverse-feed control lever 1. Fig. 7 - 07 Edge trimmer -731/02 Keep your hands away from the moving knife! Danger of injury! Press key 1 to switch the knife drive on or off. Fig.

  • Page 20: Secondary Needle-Thread Tension

    Controls Secondary needle-thread tension To increase the needle-thread tension dis-engage lever 1 by pushing it to the right. Fig. 7 - 09 Setting quick-change stepping control -918/29 The minimum stroke is set by turning balance wheel 1. The high stroke is set at the works.

  • Page 21: Bobbin-Thread Supply Monitor -926/06

    Controls Bobbin thread supply monitor -926/06 PFAFF 1425 When the set thread-end length is reach- ed, diode 1 flashes and the machine is stopped. PFAFF 1426 When the set thread end-length is reached, diode 1 (left bobbin) or 2 (right bobbin) flashes.

  • Page 22: Installation And Commissioning

    Installation and commissioning 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.

  • Page 23: Fitting The Tilt Lock

    Installation and commissioning Fitting the tilt lock .01.02 Screw on tilt lock 1, provided in the ac- cessories, using screw 2. Do not operate the machine without tilt lock 1! Danger of crushing between sewing head and table top! Fig. 8 - 02 Tensioning the v-belt .01.03 Loosen nut 1.

  • Page 24: Fitting The Top V-Belt Guard

    Installation and commissioning Fitting the top v-belt guard .01.04 Screw retainer 1 onto right v-belt half 2. Fit left v-belt part 3 using screws 4. Fit right part 2 of the v-belt guard by pushing its slots behind the heads of retaining screws 5 and screw it on with screw 6.

  • Page 25: Fitting The Synchroniser

    Installation and commissioning Fitting the synchronizer .01.06 Push synchronizer 1 onto the shaft so that stop 2 is standing in the slot on the synchronizer (see arrow) Tighten screws 3 a little. Connect the synchronizer plug to the socket on the control box. Adjust the synchronizer (see Chapter 11.04.01 Adjusting the synchronizer) Fig.

  • Page 26: Commissioning

    Installation and commissioning Commissioning Check the machine, particularly its electrical wiring and pneumatic tube connections, for any damage. Clean the machine thoroughly and afterwards fill with oil and oil the machine (see Chap- ter 10, Care and maintenance). Have a mechanic check whether the motor of the machine can be used with the avail- able power supply and that the motor is correctly connected in the junction box.

  • Page 27: Setting Up

    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! Inserting the needle on the PFAFF 1425 Switch the machine off! Danger due to unintentional starting of the machine! Only use needles of system 134-35.

  • Page 28: Inserting The Needles On The Pfaff 1426

    Setting up Inserting the needles on the PFAFF 1426 Switch the machine off! Danger due to unintentional starting of the machine! Only use needles of system 134-35! Set needle bar at top position and loosen screw 1. Push the needle fully in (the long groove of the left needle must face to the right and that of the right needle to the left).

  • Page 29: Winding The Bobbin Thread, Regulating The Winder Tension

    Setting up Winding the bobbin thread, regulating the winder tension Fig. 9 - 03 Place an empty bobbin 1 on winder spindle 2. Thread up as shown in Fig. 9 - 03 and wind the thread a few times clockwise around bobbin 1.

  • Page 30: Bobbin-Changing/Threading, And Regulating The Bobbin Thread Tension

    Regulate the bobbin-thread tension by turning screw 5. Fig. 9 - 04 Fig. 9 - 04 shows the PFAFF 1425. Do not run the machine with the bed slide open. Danger of injury by moving parts. 9 - 4...

  • Page 31: Threading Needle Thread And Regulating Its Tension On The Pfaff 1425

    Setting up Threading needle thread and regulating its tension on the PFAFF 1425 Fig. 9 - 05 Switch the machine off! Danger due to unintentional starting of the machine! Thread the needle thread as shown in Fig. 9 - 05.

  • Page 32: Threading Needle Threads And Regulating Tensions On The Pfaff 1426

    Setting up Threading needle threads and regulating tensions on the PFAFF 1426 Fig. 9 - 06 Switch the machine off! Danger due to unintentional starting of the machine! Thread the needle thread as shown in Fig. 9 - 06. Regulate the needle-thread tension by turning milled screw 1 (right needle) or 2 (left needle).

  • Page 33: Setting The Stitch Length

    Setting up Setting the stitch length Set a short stitch length by operating the stitch-length key and set the required maximum stitch length at the mark by turning regulator disk 1. Set a long stitch length by operating the stitch-length key a number of times and set the required minimum stitch length at the mark by turning regulator wheel 2.

  • Page 34: Care And Maintenance

    Care and maintenance Care and maintenance Clean hook area ........daily; more frequently if in continuous operation Check oil level (hook-oil container) ..........daily, before operation Check/adjust air pressure ............... daily, before operation Clean air filter of air-filter/lubricator ............when required These maintenance intervals apply to the average machine running time in sin- gle-shift operation.

  • Page 35: Oiling The Hook

    1 to 2 drops of oil in hole 2 of the hook gib. Only use oil with a medium viscosity of 22.0 mm²/s at 40° C and a density of 0.865 g/cm³ at 15 C. We recommend PFAFF sewing mahine oil, No. 280-1-120 144. 10 - 2...

  • Page 36: Checking/Adjusting The Air Pressure

    Care and maintenance Checking/adjusting the air pressure Before operating the machine, always check the air pressure on gauge1. Gauge 1 must show a pressure of 6 bar. If necessary adjust to this reading. To do so, pull knob 2 upwards and turn it so that the gauge shows a pressure of 6 bar.

  • Page 37: Adjustment

    Adjustment Adjustment The illustrations in this chapter show the single-needle machine, PFAFF 1425. For the two-needle machine, PFAFF 1426, various adjustments have to be made twice, i.e. on the left- and right-hand sewing hooks. This is pointed out in the chapters concerned, and some of the illustrations have to be regarded in reverse.

  • Page 38: Adjusting The Basic Machine

    Adjustment Adjusting the basic machine Adjusting the synchroniser .04.01 Requirement 1. At a seam interruption the machine must position the needle bar at 4 mm past b.d.c. 2. After thread trimming the machine must position the take-up lever at t.d.c. Fig.

  • Page 39: Balance Weight

    Adjustment Balance weight .04.02 Requirement At needle bar t.d.c. the eccentric lobe of balance weight 1 must face downwards. Fig. 11 - 02 Adjst balance weight 1 (screw 2) according to Requirement. 11 - 3...

  • Page 40: Neutral Position Of The Unison Feed

    Adjustment Netural position of unison feed 04.03 Requirement At stitch length setting " 0 " neither the top- and bottom feed dogs nor the needle bar must make any feeding movement. Fig. 11 - 03 Re-position connecting rod 1 (screws 2) according to Requirement. 11 - 4...

  • Page 41: Feeding Motion Of The Unison Feed

    Adjustment Feeding motion of the unison feed 04.04 Requirement At the longest stitch-length setting and at needle bar b.d.c. neither the top- and bottom feed dogs nor the needle bar must make any feeding motion when the reverse-feed lever is pressed. Fig.

  • Page 42: Lifting Motion Of The Bottom Feed Dog

    Adjustment Lifting motion of the bottom feed dog 04.05 Requirement With the needle bar at b.d.c. the feed dog must be at t.d.c. Fig. 11 - 05 Loosen screw 1 and undo screw 2 a half turn. Turn clamp collar 3 according to Requirement and first tighten screw 2, then tighten screw 1.
  • Page 43 Adjustment Engaging the lifting motion The lifting motion is engaged when parts 8 to 13 are fitted as shown in the upper mag- nified view. Disengaging the lifting motion Take out screw 13 and swing part 10 to the right (screw 11). Set the feed-dog teeth flush with the upper surface of the needle plate and fix shaft 7 in this position by inserting screw 13 into hole 14.
  • Page 44 Adjustment Bottom feed-dog height 04.06 Requirement 1. When the needle bar is at b.d.c., the stitch length is set at "0" and crank 5 is at the bot- tom of the slotted lever (see arrow), the bottom feed dog must protrude from the top surface of the needle plate by 0.5 mm.

  • Page 45: Needle In Needle-Hole Centre

    Adjustment Needle in needle-hole centre 04.07 Requirement At stitch length "0" the needle must enter exactly in the centre of the needle hole. Fig. 11 - 07 Position the needle-bar frame (screws 1, 2 and 3) according to Requirement. 11 - 9...

  • Page 46: Feeding-Stroke Difference

    Adjustment Feeding-stroke difference .04.08 Requirement At the longest stitch-length setting and when the balance wheel is turned, the feeding strokes of the needle bar and the bottom feed dog must be the same. Fig. 11 - 08 Reposition connecting rod 1 (nut 2) according to Requirement. Connecting rod to "...

  • Page 47: Needle Height (Preliminary Adjustment)

    Adjustment Needle height (preliminary adjustment) 04.09 Requirement At needle-bar t.d.c. the clearance between needle point and needle plate must be approx. 19 mm. 19 mm Fig. 11 - 09 Re-position needle bar 1 (screw 2), without turning it, according to Requirement. 11 - 11...
  • Page 48 Adjustment Needle rise, hook clearance, needle height (final adjustm.) and needle guard 04.10 (On the PFAFF 1426 carry out this adjustment on both hooks) Requirement At stitch-length setting "4" and needle bar at 2 mm b.d.c.: 1. the hook point must be at "needle centre" with a hook-to-needle clearance of 0.05 to 0.1 mm;...
  • Page 49 If necessary, readjust needle bar according to Requirement 2. Remove hook base and turn eccentric 6 (screw 7) according to Requirement 3. On the PFAFF 1426, also loosen screws 1, 2, 3 and 4 on the second hook and carry out the adjustments as described.

  • Page 50: Bobbin-Case Opener Stroke

    Adjustment Bobbin-case opener stroke .04.11 (On the PFAFF 1426 carry out this adjustment on both hooks) Requirement 1. The front edge of retaining spring 1 and stop 7 must must be flush. 2. In the rearmost position of the bobbin-case opener, hook base 6 and retaining spring 1 must stand apart by thread thickness.

  • Page 51: Top Feed Stroke

    Adjustment Top feed stroke 04.12 Requirement 1. With regulating wheel 6 in position "5", vibrating presser 14 and lifting presser 15 must each rise by 5.0 mm. 2. The standard stroke must be limited to 5 mm. Fig. 11 - 12 Remove spring plate 1 (screws 2).
  • Page 52 Adjustment Press key 3, Fig. 7.02 (diode on). Set vibrating presser 14 at t.d.c. by turning the balance wheel. Turn screw 3 downwards until a clearance of 7 mm is reached between vibrating presser 14 and the needle plate. Screw nut 4 up to the housing and lock it with nut 5. Screw on spring plate 1 (screw 2).

  • Page 53: Top Feed Lifting Motion

    Adjustment Top-feed lifting motion 04.13 Requirement When a lifting-presser stroke of 3 mm is set and the descending needle is 3 mm above the needle plate, the vibrating presser must just reach the needle plate. 3 mm Fig. 11 - 13 Turn eccentric 1 (screws 2) according to Requirement.

  • Page 54: Clearance Between Lifting Presser And Needle Plate

    Adjustment Clearance between lifting presser and needle plate .04.14 Requirement With the lifting presser raised there must be a clearance of approx. 16 mm between lifting presser and needle plate. 16 mm Fig. 11 - 14 Raise the lifting presser and lock it with fixing key 1. Turn plunger 1 (nut 2) according to Requirement.

  • Page 55: Bobbin Winder

    Adjustment Bobbin winder 04.15 Requirement 1. When the bobbin winder is engaged, the winding spindle must be driven reliably; when it is disengaged, friction wheel 5 must not rest on driving wheel 1. 2. The bobbin winder must wind evenly and switch itself off when the filled thread is about 1 mm from the edge of the bobbin.
  • Page 56 Adjustment Thread check spring and regulator on the PFAFF 1425 04.16 Requirement 1. The movement of thread check spring 7 must be completed when the needle point enters the material. 2. When the thread loop is opened to its largest amount while being passed around the sewing hook, thread check spring 7 must rise slightly from rest 1.
  • Page 57 Adjustment Thread check springs and regulators on the PFAFF 1426 04.17 Requirement 1. The movement of thread regulators 3 and 6 must be completed when the needle enters the material. 2. When the thread loop is opened to its largest amount while being passed around the sewing hook, thread check springs 3 and 6 must rise slightly from rests 1 and 9.

  • Page 58: Maximum Sewing Speeds

    Adjustment Maximum sewing speeds 04.18 PFAFF 1425 Top feed stroke Max. speed in s.p.m. 7 mm 1 800 6 mm 1 800 5 mm 2 200 4 mm 3 000 3 mm 3 000 2 mm 3 600 1 mm...

  • Page 59: Speed Reduction On Increase Of Stitch Length

    Adjustment Speed reduction on increase of stitch length 04.19 Requirement For stitch lengths of more than 6 mm the speed must be reduced to 3000 r.p.m. Fig. 11 - 18 Adjust switch 1 (screw 2) according to Requirement. The setting of the switch can be checked on the control panel (see under "Hardware test"...

  • Page 60: Speed Reduction On Increase Of Stroke

    Adjustment Speed reduction on increase of stroke 04.20 Requirement 1. For a stroke of 2.5 mm the speed must be reduced to 3000 r.p.m. 2. For a stroke of 4.5 mm the speed must be reduced to 2200 r.p.m. Fig. 11 - 19 Re-position trip 1 (screw 2) according to Requirement 1.

  • Page 61: Needle-Thread Tension Release

    Adjustment Needle-thread tension release 04.21 Requirement 1. When stop 4 is actuated by hand there must be a clearance of at least 0.5 mm between tension discs 3. 2. When stop 4 is in its resting position the tension must be engaged. 0,5 mm 0,5 mm Fig.

  • Page 62: Lubrication

    Adjustment Lubrication 04.22 Requirement After a running time of ten seconds a thin film of oil must appear on a paper strip 1 held at the side of the sewing hook. Fig. 11 - 21 Run the machine for 2 to 3 mins. Do not put your hands into the sewing area while the machine is running! Danger of injury by moving parts! Check that machine has been filled with oil and that oil lines are free of air.

  • Page 63: Re-Engaging The Slip-Clutch

    Adjustment Re-engaging the slip-clutch .04.23 Clutch 1 is adjusted at the works. In the case of a thread jamming, clutch 1 will disengage, in order to avoid damage to the hooks. The following describes how to re-engage clutch 1. Fig. 11 - 21a Remedy jammed thread fault.

  • Page 64: Parameter Adjustments

    Adjustment Parameter adjustments 04.24 On the control panel the paramaters can be adjusted on the display. Group Parameter Meaning Adjustm. range Standard setting Speed on change of stroke 300 - 6400 1800 Speed limitation 300 - 6400 3000 (low stroke) Speed limitation 300 - 6400 2200...

  • Page 65: Adjusting The Edge Trimmer -731/02

    Adjustment Adjusting the edge trimmer -731/02 Neutral position of knife .05.01 Requirement When the edge trimmer is disengaged, the knife must not move when the balance wheel is turned. Fig. 11 - 22 Turn on compressed air and disengage edge trimmer. Turn cylinder plunger 1 (nut 2) according to Requirement.

  • Page 66: Knife Stroke

    Adjustment Knife stroke 05.02 Requirement The maximum knife stroke must be 9 mm Fig. 11 - 23 Engage edge trimmer. Adjust screw 1 (nut 2) according to Requirement. 11 - 30...

  • Page 67: Cutting Stroke

    Adjustment Cutting stroke 05.03 Requirement With the edge trimmer engaged and the needle bar at b.d.c. the knife must be at t.d.c. Fig. 11 - 24 Engage edge trimmer and set needle bar at b.d.c. Turn eccentric 1 (two srews 2) according to Requirement. 11 - 31...

  • Page 68: Actuating Lever

    Adjustment Actuating lever 05.04 Requirement With the edge trimmer disengaged there must be a clearance of 0.5 mm between base 3 and the housing. Fig. 11 - 25 Re-position lever 1 (screw 2) according to Requirement. 11 - 32...

  • Page 69: Knife Height

    Adjustment Knife height 05.05 Requirement When the knife is at b.d.c. the front of the knife cutting edge must be about 0.5 mm under the top edge of the stationary knife. 0.5 mm Fig. 11 - 26 Engage edge trimmer and set knife at its lowest position. Re-position knife 1 (screws 2) according to Requirement.

  • Page 70: Knife Position In Sewing Direction

    Adjustment Knife position in sewing direction 05.06 Requirement With the needle bar at b.d.c. the middle of the knife must be at "needle centre." Fig. 11 - 27 Re-position knife mounting 1 (screw 2) according to Requirement. 11 - 34...

  • Page 71: Knife Position Crosswise To Sewing Direction

    Adjustment Knife position crosswise to sewing direction 05.07 Requirement 1. The knife must rest with light pressure against stationary knife 3. 2. The knife must be at a slight angle to stationary knife 3 (shear action of approx. 2°). Fig. 11 - 28 Adjust knife mounting 1 (screw 2) acording to Requirement 2.

  • Page 72: Adjusting The Thread Trimmer 900/81

    Adjustment Adjusting the thread trimmer 900/81 Resting position of roller lever/radial position of control cam .06.01 Requirement 1. When cylinder plunger 1 is retracted there must be a clearance of 0.1 mm between outer edge of control cam 6 and the roller of lever 5. 2.

  • Page 73: Thread Catcher Height

    Adjustment Thread-catcher height .06.02 Requirement The lower edge of thread catcher 3 must clear bobbin 4 case by about 0.8 mm. Fig. 11 - 30 Loosen screws 1 and 2. Set thread catcher 3 above bobbin case 4. Re-position thread catcher 3 (screw 5) according to Requirement. Balance out the vertical play of shaft 6, set fixing collar 7 against bearing housing 8 and tighten screw 2.

  • Page 74: Thread Catcher Position

    Adjustment Thread catcher position .06.03 Requirement When the thread catcher is in its resting position, the edges of thread catcher 4 and knife 5 must be flush (see arrow). Fig. 11 - 31 Set needle bar at b.d.c. and push roller lever 2 against control cam 3. Turn thread catcher 4 according to Requirement.

  • Page 75: Knife Height

    Adjustment Knife height .06.04 Requirement With the thread trimmer in its resting position the edges of thread catcher 3 and knife 5 must be flush (see arrow). Fig. 11 - 32 Check knife height according to Requirement. To adapt the height of knife 1, remove it (screws 2) and fit shims (part No. 91- 141 402-05) according to Requirement .

  • Page 76: Knife Pressure

    Adjustment Knife pressure .06.05 Requirement When the front edge of thread catcher 3 has passed the cutting edge by half, knife 4 must rest with light pressure on the edge of the catcher. Fig. 11 - 33 Set take-up lever at b.d.c. and push roller lever 1 into control cam 2. Turn balance wheel until front edge of catcher 3 has passed cutting edge of knife 4 by half.

  • Page 77: Bobbin-Thread Retaining Spring

    Adjustment Bobbin-thread retaining spring .06.06 Requirement Retaining spring 1 must 1. not be deflected during the thread catcher movement, 2. reliably retain bobbin thread 4 after cutting, and 3. not hinder removal and replacment of the bobbin case. Fig. 11 - 34 Set thread trimmer at its resting position.
  • Page 78 Adjustment Thread catcher transmission crank (only on the PFAFF 1426 ) .06.07 Requirement With the thread trimmer in its resting position the bearing points of roller 3, roller lever 4 and ball-joint 5 must be aligned. Fig. 11 - 35 Set thread trimmer at resting position.
  • Page 79 Adjustment Tansmission linkage (only on the PFAFF 1426) .06.08 Requirement With the thread trimmer in its resting position, transmission cranks 3 and 4 must stand parallel with each other. Fig. 11 - 36 Set the thread trimmer at its resting position.

  • Page 80: Manual Cutting Test

    Adjustment Manual cutting test .06.09 Requirement 1. When thread catcher 1 is on its forward stroke, it must not carry bobbin thread 3 forward too. 2. When thread catcher 1 is in its front position, bobbin thread 3 must be approx. 2 mm behind the prong of thread catcher 1.
  • Page 81 Adjustment Adjusting the bobbin-thead supply monitor -926/06 (On the PFAFF 1426 carry out this adjustment on both hooks) Requirement When the reflection surface is positioned at the transmitting and receiving unit, the luminous diode on the amplifier must light up and the highest possible voltage applied.
  • Page 82 G.M. PFAFF Aktiengesellschaft Postfach 3020 D-67653 Kaiserslautern Königstr. 154 D-67655 Kaiserslautern Telefon: (0631) 200-0 Telefax: (0631) 172 02 Telex: 45753 PFAFF D Gedruckt in der BRD Printed in Germany Imprimé en R.F.A. Impreso en la R.F.A.

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