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Global LP 1971-745 (AUT) Series, Instruction Manual & Instruction For Service Manual, Page: 2 / 60

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Global LP 1971-745 (AUT) Series Instruction Manual & Instruction For Service Manual Download Page 2

Contents - part A - Instruction manual:

1. Proper use of the machine 

................................................................................................................................................ 1

2. Description of the machine 

............................................................................................................................................... 1

3. Machine sub-classes and sewing categories  

.................................................................................................................. 2

3.1

Sub-class

  ................................................................................................................................................................ 2

3.2

Sewing categories 

................................................................................................................................................... 2

4. Survey of equipment 

 

......................................................................................................................................................................... 2

4.1

Equipments 

............................................................................................................................................................................... 2

4.1.1 Needles    ....................................................................................................................................................................... 2
4.1.2 Wheel feeders  .............................................................................................................................................................. 2
4.1.3 Top roller holders  ........................................................................................................................................................ 2
4.1.4 Top rollers   ................................................................................................................................................................... 2
4.1.5 Throat plate   ................................................................................................................................................................. 3
4.1.6 Throat plate inserts  .................................................................................................................................................... 3
4.1.7 Trimmer knife   .............................................................................................................................................................. 3
4.1.8 Guide   ........................................................................................................................................................................... 3
4.1.9 Connecting cables of the head to the drive  ............................................................................................................ 3

4.2

Optional eqiupment  

............................................................................................................................................................... 3

5. Technical data 

 

................................................................................................................................................................................... 3

6. Operation of the machine 

................................................................................................................................................. 5

6.1

Threading a thread   

............................................................................................................................................... 5

6.2

Bobbin thread winding   

 ......................................................................................................................................... 5

6.3

Inserting the bobbin and threading the lower thread  

............................................................................................ 5

6.4

Regulating the thread tension  

 .............................................................................................................................. 6

6.5

Needle replacement  

.............................................................................................................................................. 7

6.6

Regulation of pressing the top roller  

..................................................................................................................... 7

6.7

Lifting the top roller up  

.......................................................................................................................................... 7

6.8

Reverse stitching   

.................................................................................................................................................. 8

6.9

Stitch length adjustment   

....................................................................................................................................... 8

6.10 Safety clutch  

............................................................................................................................................................................ 8

6.11 To exchange and set the trimmer knife  

............................................................................................................................. 8

APPENDIX

 

- 

applies for the double-needle post-bed sewing machine with trimmer 4281i-2

  .............................................. 9

7. Electronic control of the machine   

................................................................................................................................................ 11

7.1

Control of sewing by means of control elements 

 ............................................................................................................ 11

7.1.1 Via treadle   ....................................................................................................................................................................11
7.1.2 Via control pushbutton panel   .................................................................................................................................. 11
7.1.3 Via control panel V810/V 820   .................................................................................................................................. 11

7.2

Adjustment of automatic functions via control panel for stop motor  

 .........................................................................12

7.2.1 By using stop motor Efka with panel V 810   ........................................................................................................... 12

7.2.1.1 Adjustment by means of buttons with fixed setting function   ............................................................. 12
7.2.1.2 Setting by means of parameters   .............................................................................................................. 13

7.2.2 By using stop motor Efka with panel V 820   ........................................................................................................... 14

7.2.2.1 Adjustment by means of buttons with fixed setting function   ............................................................. 15
7.2.2.2 Setting by means of parameters   .............................................................................................................. 15

8. Maintenance

 

....................................................................................................................................................................................... 16

Operating instructions for eventual trouble shooting 

................................................................................................................ 17

Summary of Contents for LP 1971-745 (AUT) Series

Page 1: ......

Page 2: ...the top roller 7 6 7 Lifting the top roller up 7 6 8 Reverse stitching 8 6 9 Stitch length adjustment 8 6 10 Safety clutch 8 6 11 To exchange and set the trimmer knife 8 APPENDIX applies for the double needle post bed sewing machine with trimmer 4281i 2 9 7 Electronic control of the machine 11 7 1 Control of sewing by means of control elements 11 7 1 1 Via treadle 11 7 1 2 Via control pushbutton p...

Page 3: ... fabric waste Service maintenance inspection repair and or Transport The user also has to assure that only authorized personnel work on the machine The user is obliged to check the machine at least once per shift for apparent damages and to immediatly report any changes including the performance in service which impair the safety The user company must ensure that the machine is only operated in pe...

Page 4: ...until such time as the entire sewing unit is found to comply with EC directives It is absolutely necessary to respect the safety instructions marked by these signs Danger of bodily injuries Please note also the general safety instructions IMPORTANT WARNING To the feeding network cord it is necessary to connect the respective network plug which has been approved in the country of utilizing the mach...

Page 5: ...the stitch length regulation mechanism via friction clutch to the lower feed shaft and from it by a roller chain to the feed wheel The drive of the roller presser foot is derived from the bottom feeding shaft through an indented belt on the top feeding shaft through abevel gearing on an articulated vertical shaft The needle feed is derived from the same mechanism as the top roller feed wheel feed ...

Page 6: ...145 4181i 1XX 300 130 35 0 6 2 0 1 5 S548 000311 M 173 M 059 M 146 4 Survey of equipment This survey does not include the equipment assembled on the stand 4 1 Equipments at least one of each from the following group of equipment is assembled 4 1 1 Needles M 020 needle 134 LR size 80 M 023 needle 134 LR size 100 M 021 needle 134 LR size 130 4 1 2 Wheel feeders M 060 wheel feeder with pitch of teeth...

Page 7: ...lled Number Sewing Hook category tween the number of of needle speed needle axis polyester and the work thread trimmer line Standard mm mm mm mm 0 01mm 0 01mm SPM SPM 100 lihgt 0 8 2 0 8 2 3 70 80 60 80 60 80 2500 3500 R 816 200 medium 1 2 1 2 2 5 5 40 50 30 100 80 110 2500 3000 R 816 300 me dium heavy 1 5 2 1 5 3 5 20 30 20 130 110 140 2000 2000 R 816 Thickness of one layer Number of layers Stand...

Page 8: ...y the following companies FORTUNA WIEN GmBH A 1151 WIEN Pelzgasse 13 Postfach 91 MAIER UNITAS GmBH NÜRTINGER Strasse 19 D 7316 KÖNGEN Postfach 1130 Tooling steel For normal lining flat version material with long cutting edge cross sections front end turned up High speed steel For very soft or flat version synthetic linings long cutting edge material with front end turned up cross sections Tooling ...

Page 9: ...f after winding Take off the hook bobbin and cut off the end in the equip ment 4 The nut 5 is instrumental to thread tension control for winding Turning clockwise sense the thread tension is in creased and the single threads are more firmly fixed on the bobbin The tension cannot be so extensive as far as slipping of the winder friction drive has occured 6 3 Inserting the bobbin and threading the l...

Page 10: ...e 5 If the maximum lower thread tension exceeds the values given in table No 4 it may cause problems in the beginning of sewing after the previous thread trim Measurement of tension is done by dynamometer Warning The upper thread tensioner has been loosened automatically after every trimming and top roller lifting In these cases the thread tension cannot be measured Regulating the thread tension C...

Page 11: ...the top roller would not fly over when needle comes off the material and that the feeding power got over the thread pull by stitch tightening By turning of the screw 1 clockwise pressing of the top roller has been increased by counter clockwise turning pressing of the top roller has been decreased 6 7 Lifting the top roller up Mechanical lifting of the top roller is enabled by means of the hand le...

Page 12: ... Before assembly turn the main switch off and wait until the motor stops Loosen the nut 1 Move the trimmer knife 2 in the direction of the arrow out Set an angle of 180 on the handwheel the needle is at its bottom dead point Insert a new trimmer knife 2 and set its trimmer surface in relation to the edge of the inlay of the throat plate A just permitting the trimmer knife movement Tilt the machine...

Page 13: ...serts M 217 insert for throat plate for needle 60 80 needle distance of 1 2 mm trimmed edge 0 8 mm M 210 insert for throat plate for needle 80 110 needle distance of 1 6 mm trimmed edge 1 2 mm M 209 insert for throat plate for needle 60 80 needle distance of 1 6 mm trimmed edge 0 8 mm 5 Technical data Table 3 Sewing Needle Distance Stitch length Labelled Number Sewing speed Hook category distance ...

Page 14: ...on Risk of injury Before remowing and inserting the needle turn the main switch off and wait until the motor stops Turn with the hand wheel as far as the top needle 1 position has been reached Loosen the screw 2 3 and remove the required needle When inserting a new needle care is to be taken that groove 4 above the needle s eye was in the same direction as the hook Tighten the screw 2 3 The insert...

Page 15: ...fully back wards 7 1 2 Via pushbutton panel There are four built in pushbuttons in the panel with fixed adjustable functions T1 bar operation by pressing this pushbutton during sewing the sewn work is feed back T2 needle up down each press of the pushbutton changes the needle position T3 temporary cancelling recalling bar in case the bar is pre programmed at the start and end of the seam by pressi...

Page 16: ...nning Symbol F The revolutions limitation switch on Symbol G Connection of lower thread controller flashing light indicator symbol when the threads supply on the bobbin is running out The arrows on the display indicate switching the functions which are displayed by symbols above the pushbuttons on 7 2 1 1 Adjustment by means of buttons with fixed setting function Note It is important to finish the...

Page 17: ...ested number of parameter push pushbutton E down and it will be shown the value of parameter on the display you can change the value by means of pushbutton or by pushing pushbutton E down you will change the sequence to the following number of parameter by pushing pushbutton P down you will leave the mode of changing parameters Note 1 For permanent memory storing of changed pa rameter it is necess...

Page 18: ...on of pressure of the presser foot ON OFF only for DC 1550 DA320 see The instructions for assembling with Mini stop par 5 2 4 Pushbutton 7 Basic needle position UP DOWN Pushbutton 8 Lower thread waste controlling ON OFF Pushbutton 9 Operation pushbutton programmable Pushbutton 0 Programming processing of 40 possible sewing sections seams Pushbutton A For cancelling or calling the bar Pushbutton B ...

Page 19: ...es forwards Err SEr XXX end fancy bar number of stitches backwards Note The last section of end bar must have at least 3 stitches Foot position adjustment by stopping at the seam by neutral position of treadle and after finishing seam by neutral posi tion of treadle Setting is by means of pushbutton 6 arrow indication above the corresponding symbol Needle position adjustment by stopping at the sea...

Page 20: ...rogrammes with the given stitch numbers and sewing direction forwards rear wards For more detailed information see the original driving instructions 8 Maintenance Caution Risk of injury Maintenance work can only be carried out when the machine is off and the motor stops Maintenance work which must be carried out and the intervals between them and set out in the following table Maintenance work Int...

Page 21: ...cing between sewn material and rear edge of piercing hole 3 4 Upper thread incorrectly caught by movable trimming knife Lumps of thread remaining in hook space Method of troubleshooting Thread the upper thread according to NP par 6 1 Set the tension according to NP par 6 4 Replace needle according to NP par 6 5 Use a thicker needle Set distance between hook and needle according to SK par 3 1 3 and...

Page 22: ...ght 4 4 Excessively elastic material or ex cessively elastic thread 4 5 Damaged hook point 5 1 Lower thread tension 5 2 Incorrect threading and tension setting of upper thread 6 1 Upper thread out of tensioning dishes 6 2 Opening bobbin case lifter incor rectly set it opens too little 6 3 Wheel feeder too low difficult pas sage of thread between sewn ma terial and throat plate 6 4 Upper thread ins...

Page 23: ...g 15 1 Incorrect setting of the cutting sur face cutting edge against the edge of the throat plate insert Incorrect setting of the cutting sur face cutting edge against the nee dle Knife cutting edge height incor rectly set according too the trim med material 15 2 Excessive blunting of the knife cut ting edge Thread upper thread according to NP par 6 1 Set side position of the throat plate post ac...

Page 24: ...s for service 4181i 1 Minerva Boskovice a s Sokolská 60 CZ 680 17 Boskovice Tel 420 516 453434 453433 494111 Fax 420 516 452165 http www minerva boskovice com Edition 02 2005 Printed in Czech Republic S735 000674 ...

Page 25: ... 3 4 6 Setting the additional thread limiter 3 5 Feeding mechanism of the needle feed and of the lower feed wheel 10 3 5 1 Description 3 5 2 Stitch length mechanism 3 5 2 1 Setting the upper eccentric 3 5 2 2 Setting the prop 3 5 2 3 a Forward and rearward stitch length distribution rough 3 5 2 3 b Forward and rearward stitch length distribution fine 3 5 2 4 Setting of the control knob including t...

Page 26: ...ting of the trimming knife position 5 4 1 Replacement of the knife and setting of the distance between the knife and the throat plate insert 5 4 2 Setting of the knife position turning in the sewing direction 5 4 3 Height setting of the knife 5 5 Setting of engaging and disengaging of the trimming mechanism of the angaging and carried lever stop 5 5 1 Description 5 5 2 Setting of the engaging leve...

Page 27: ...owing still remaining possible sources of injury 1 Moving sewing needle risk of injury when sewing with raised pressure foot or top roller because the finger guard is then positioned too high 2 Moving thread take up lever risk of injury when inadvertently or intentionally inserting the finger s between the thread take up lever and its guard 3 Moving pressure member risk of injury when holding sewn...

Page 28: ... required distance A For setting up use the setting gauge 7 as per the repective figure After having set it tighten carefully the screws By axial shifting of the gear wheel 5 set the axial clearance in such a way that this clearance is the least possible but sufficient for turning easily the hook Tighten carefully the screws 2 Caution One of these screws must bear on the flat of the shaft 6 3 1 3 ...

Page 29: ...r between the protective sheet and the hook body 3 we shall reduce the play by levering in applying the pressure on the protective sheet in the sense of the arrow 4 we shall increase the play Check up the protecting effect in pushing against the needle in the sense of the arrow 5 The hook point must not catch the needle If so set up the protecting effect correct eventually the setting of the dista...

Page 30: ...themoment when the hook point comes to lie opposite the needle 4 The wheel 2 is to be set with its gear rim symmetrically to the centre of the gear wheel 1 The clearance between the gear wheels is to be the least possible Caution Danger of injury Switch off the main switch Before starting the setting operation wait until the motor stops Set the angle of 2O5 on the handwheel 6 and lock it with the ...

Page 31: ...um and is provided with a stuck in eyefortwothreads Theconnectingrod 2 ismountedontheeccentric pin 3 The needle rod holder 4 is mounted through the pivot 5 in a rotating way in the arm 6 In its top part the holder is guided by the guide pin 7 The movement for the needle feed is given to it by the connecting rod 8 driven by the feeding shaft 9 The connecting rod 8 is mounted by pin 13 with needle b...

Page 32: ...2 Loosen the screw 3 of the guide pin 4 In shifting the pin 2 set the needle bar holder on the measure A 8mm distancebetweenthefrontfaceofthearmandthefrontface of the safety bolt 5 of the needle bar holder at the same time the pin 4 shifts The guide pin 4 is to be set in such a way that the needle bar holder moveseasily Tighten the screws 1 and 3 3 2 5 Setting the needle the needle bar holder in t...

Page 33: ... off the main switch Before starting the setting operation wait until the motor stops Turn slightly the finger 2 in the sense towards the throat plate 1 Place the throat plate 1 and screw in the screws 6 Place the insert 4 and screw in the screws 5 3 3 3 Side setting of the throat plate post The post of the throat plate 1 is to be side set in such a way that the axis of the hole in the insert of t...

Page 34: ...fficient for unthreading the thread from the sewn material when removing the sewn material from the pressing element without leaving the tensioner 3 4 3 Setting the tensioning mechanisms of the main tensioners In the rest position of the tensioners when pushing the plate of the tensionersonthespot A 3 4 1 thisplatemusthavethesocalleddead travelofabout0 5mm Atthislifting thetensiondiscsofthetension...

Page 35: ...t distant point of the hook the spring 2 shifts by about 1 4 to 1 2 length of its total length This means that the thicker will be the sewn material and the longer will be the stitch length the more will be the limiter shifted in the sense of the arrow and inversely Under standard sewing conditions the thread limiter is set in its tested positions depending on the sewing category in accordance wit...

Page 36: ...dplate owing to the unambi guous setting of the eccentric by means of the setting bar Insert the setting bar 3 into the hole in the eccentric 1 and prop it from above against the feeding shaft 4 Shift axially the eccentric 1 on the shaft into its extreme positions and place it in the middle Tighten the screws of the eccentric 1 to the maximum one screw first and after having turned slightly the ha...

Page 37: ...xcepting the first sewing category where the stitch length of the indicator is 3 mm Caution Danger of injury Switch off the main switch Before starting the setting operation wait until the motor stops Screw in the screw of the control knob in such a way that the spherical surface of the screw 3 bears on the seat of the cam 4 Loosen the screw 5 and turn the control knob in the clockwise direction u...

Page 38: ...Within a short instant when engaging and disengaging with the carrier plate 5 there are in a friction engagement both the cover 1 and also the star 4 namely in the dead centre of the connecting rods 2 and 3 The setting of the change over of clutches is done by tightening or by loosening the nut 13 3 5 3 1 2 Setting the lever of the second step of feeding angle position The lever of the second step...

Page 39: ...at the shifting of the clutches is done at the moment when the clutch disks 3 do not move which means when they are at the dead center of their oscillating movement This corresponds to the angle 90 on the handwheel Caution Danger of injury Switch off the main switch Before starting the setting operation wait until the motor stops Loosen the screws of the indented pulley of feeding and shift it to ...

Page 40: ...n of the chain 2 is to be corrected Caution Dangere of injury Switch off the main switch Before starting the setting operation wait until the motor stops Loosen the screw 3 Loosen the screw 4 Loosen or tighten the screw 5 and push simultaneously with finger the feeder 1 downwards until the required height of the teeth X of the wheel feeder is attained Tighten then still the screw 5 by 45 1 8 revol...

Page 41: ...eofthetoproller 1 soastoavoidtheslippageofthesewnmaterial when feeding it Method of setting the height of the top roller Lower by hand the presser bar 3 with the top roller 1 above the wheel feeder 5 Loosen the screw 4 and set the required value A 0 2 mm Tighten the screw 4 Setting the force of the top roller 1 Inscrewinginthescrew 2 theforceofthetoprollerisincreasedand inversely 3 6 Feeding mecha...

Page 42: ... is to be done as follows Caution Danger of injury Switch off the main switch Before starting the setting operation wait until the motor stops Loosen the screws 1 of the pulley 2 Set the pulley 2 in such a way that the distance of 5 mm is attained in accordance with the illustration Tighten the screws 1 3 6 4 Setting the tensioning roller The tensioning roller of the indented belt of the top feedi...

Page 43: ... the left in such a way that it is out of the pulley 4 Remove the pulley 4 Remove the front guard Loosen and unscrew the screw 14 of the holder of the wheel 15 and remove it from the holder 21 Loosen the screws 16 and 17 of the holder 18 Removetheholder 18 togetherwiththeholder 15 andarticulated shaft 13 from the machine Loosen the screws 19 of the pulley 20 Loosen the screw 24 of the ring 25 Hold...

Page 44: ...ler 3 in the groove of the holder 4 set the required value X and tighten the screw 1 Loosen the screw 5 By shifting the holder 2 in the holder 6 set the bottom edge of the roller to the edge of the needle operture Tighten the screw 5 3 6 6 3 Setting the gear clearance and in the mounting of the top roller Intheconegearofthedriveofthetoprollerfoot theminimumclearance must be set A too small clearan...

Page 45: ...ith electromagnet is to be A 12 5 mm Caution Danger of injury Switch off the main switch Before starting the setting operation wait until the motor stops Place a cube 1 having the height of A 12 5 0 7 mm under the presser foot Screw in thoroughly downwards the screw 2 Tighten slightly the screw 3 in such a way that the lever 4 turns on the shaft 5 with a certain friction moment Push with the screw...

Page 46: ...bbin the pressing function of the cam on the winders shaft is interrupted and it moves in the sense of the arrow A fine setting is to be done on an incorporated condition in the machine Using the screw 2 the position of the friction part of the pickup lever 1 is adapted In opening the lever the stopping function is accelerated Its inverse function delays it A test is to be done after having insert...

Page 47: ...ncrease and on the contrary The value of the tensioning moment is very sensible to the turning of the nut 5 When setting it it is necessary to proceed very carefully set it up only in emergency cases Check the moment using a torque limiting wrench Caution The clutch guarantees only one mutual position of the hub of the lower shaft 2 and that of the beltwheel 1 Nocheckingaccordingtothegaugemarks is...

Page 48: ...ch off the main switch Before starting the setting operation wait until the motor stops The belt is correctly tensioned when the opposite sides of the belt approach one to another by up to 20 mm in applying the force of 10 N The belt is tensioned in turning respectively the motor in its holder 3 11 2 Replacing the V Belt Caution Danger of injury Switch off the main switch before starting the setti...

Page 49: ...th the same quality When putting the machine into operation each mechanism of the machine is to be lubricated with several drops of oil Oil is only refilled thereafter into the oil reservoirs using an oil can into the holes in the oil level indicators The oil tanks 1 2 3 of the central distribution is to be filled up to the mark max 3 13 3 Multiple oil use Oil which runs into the oil cup is collec...

Page 50: ...et 5 and at the same time t h e shaft 2 up to the stop against the shaft 3 With the holder 1 held on the stop shift the shaft 2 in such a way that there appears the gap A 0 2 to 0 4 mm and tighten the screw 4 Check the gap A in shifting the armature 6 4 3 Setting the cam The position of the cam 1 against the shaft 2 is to be such so that when the adjusting pin is in contact with the shaft 4 the pr...

Page 51: ...hten the screw 4 4 6 Setting the height of the fixed knife and of the retaining spring of the lower thread The fixed knife 1 and the retaining spring 2 are fixed on the holder 3 This holder is fixed with the screw 4 on the post of the hook 5 In its height the holder 3 is to be set in such a way so that the top surface of the fixed knife 1 is by 1 8 mm below the top surface of the throat plate Caut...

Page 52: ...thread from the retaining spring is attained The pulling force is tested using a screwdriver 4 according to the illustration Caution The setting of the retaining spring 1 depends on the setting of the hook thread tension and differs then according to the respective sewing category The adjusting screw 2 should not be screwed in in such a way that the retaining spring gets over the perimeter of the ...

Page 53: ...size of the trimming knife lift is set up to about 2 5 mm whichsuitsthemajorityofthesewingoperations Fortrimmingdifficult materials this lift is to be increased to the maximum of 4 3 mm When sewing and trimming small inner curves the lift is to be lowered to the minimum of 1 2 mm Caution Danger of injury Switch off the main switch Before starting the setting operation wait until the motor stops Lo...

Page 54: ...dle enters the throat plate Loosen the screws 2 and 3 and adjust the knife with the holder 4 and the sleeve 5 as required Tighten the screws 2 and 3 Setting for models with inner curves Turn the shaft of the trimming drive by means of the ring 1 until the trimming corner of the knife B gets into the front dead centre Turn the hand wheel until the needle leaves the throat plate Loosen the screws 2 ...

Page 55: ...urns the hand lever 9 back into the position B and after having released the pawl 13 by means of the press button 14 into the starting position A up to the stop 10 Switchingoffofthetrimmerwillbedonebypressingtheswitchoffplate 15 which throughthepush button 12 willreleasethepawl 7 from the slot of the lever 1 At the same time the operating device of the microswitch is being shifted and stops the ru...

Page 56: ...ff the main switch Before starting the setting operation wait until the motor stops Loosen 2 screws 1 on the adjusting ring 2 In turning the ring 2 set at random the twisting moment of the spring 3 and tighten both screws 1 Start sewing together with the edge trimming Stop the machine in the middle of the seam without removing the sewn material Using the push button 4 stop the trimming function an...

Page 57: ...1 of the electromagnet Shift the core 2 with the pin 3 and unscrew the locking screw 4 Unscrew the pin 3 in the core 2 in the A direction up to the stop Push the core 2 into the magnet 5 in the B direction up to the stop Inthisposition setthemaximumtoprollerliftinginthe B direction Screw on and tighten the arresting screw 4 Screw on the cap 1 6 3 Setting the electromagnet current The time response...

Page 58: ...ps By loosening the screws 1 it is possible to set the position of the holder of the push buttons 2 in the sense of sewing 7 4 Change of the function of push buttons The Function of the push buttons can be changed in accordance with the possibilities given by the stopmotor see instruction for use of stopmotor 8 Connecting the electric elements on the machine head The connection of the electric ele...

Page 59: ... sewing within the extent from the light to medium heavy duty sewing The setting of the machine must be adapted to the sewing parameters including also replacement of some components such as e g needle the throat plate insert For this reason the setting of the machine is divided into 3 categories 1 light sewing 2 medium sewing 3 medium heavy duty sewing In the factory where this machine has been m...

Page 60: ...retaining spring of the trimming device according to the paragraph 4 8 5 When changing markedly the sewing category together with a marked change of the needle number it is necessary to correct the setting of the distance of the hook from the needle according to the paragraph 3 1 3 6 There are in use various types of feeders with the purpose of avoiding imprinting the teeth in the lining leather O...

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