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Duerkopp Adler 4181-3, Instructions For Service Manual, Page: 29 / 35

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Duerkopp Adler 4181-3 Instructions For Service Manual Download Page 29

26

4.8 Setting the retaining spring of the hook thread

The retaining spring (1) holds the hook thread after having

performed the trimming. It is to be set in such a way that the

force necessary for pulling out the thread from the retaining

spring (1) is approximately equal to the force necessary for

pulling out the thread from the hook.

Caution! Danger of injury!

Switch off the main switch! Before starting the setting

operation, wait until the motor stops!

- Shape the retaining spring (1) in such a way that it fits close

with all  its surface (without wedge) onto the moving  trim-

ming knife (3).

- Shape the retaining spring in such a way that it fits close, with

the slightly tightened screw (2), onto the moving trimming

knife without any pressure.

- Tighten the screw (2), until the necessary force for pulling the

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 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

moving trimming knife.

4.9 Setting switching of the electromagnets

The electromagnets of the trimming device and loosening of the

tensioner must work in accordance with the diagram. This is

ensured by setting the stopmotor (see the instructions for use of

the stopmotor).

1- 1. position of the needle (225

°

 on the handwheel)

2- 2. position of the needle (64

°

 on the handwheel)

3- position of stopping the tensioner (10

°

 ÷ 25

°

 on the hand-

wheel)

4- movement of the pickup roller

5- current of the trimming device electromagnet

6- current of the tensioner loosening electromagnet

5. Material trimming

5.1 Description of the trimming mechanism

The movement of the trimming knife is derived from its own

drive (motor) by means of eccentrics and of a  leverage with

the possibility of switching off the trimming function using

the lever (1) downwards, switching on is done by the lever (2)

in the direction  from the operator, the height setting is done

by the eccentric (3) using the pin 

  ø

 3 mm.

3

2

1

3

1

3

1

2

4

5

6

1

3

2

4

3

1

2

Summary of Contents for 4181-3

Page 1: ... for service 4181 3 Minerva Boskovice a s Sokolská 60 CZ 680 17 Boskovice Tel 420 501 453434 453433 494111 Fax 420 501 452165 http www minerva boskovice com Edition 06 2001 Printed in Czech Republic 735 342 000 407 ...

Page 2: ... 4 Setting the adapting spring 3 4 5 Setting the 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 contr...

Page 3: ... 4 9 Setting switching of the electromagnets 5 Material trimming 26 5 1 Description of the trimming mechanism 5 2 Mounting and dismantling the motor trimming drive 5 3 Setting the position of the material trimming knife 5 4 Setting the length of the trimming knife movement with regard to the stich length 5 5 Setting of the trimming switching on and off microswitch 5 6 Setting of the switching on l...

Page 4: ...e actions of the operator may lead to dangerous situations In industrial sewing machines Minerva attention should be paid to the following 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 intentio...

Page 5: ... motor stops Remove the guard 1 Loosen both screws 2 By turning the screws 3 and 4 set the required distance A 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 fla...

Page 6: ...tween 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 distance ...

Page 7: ... at the moment 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...

Page 8: ...ted for a big or a small hook The needle bar holder 4 is mounted through the pin 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 eccentric pin 13 with needle bar holder 4 The connecting rod 10 of the needle bar 11 on the l...

Page 9: ...ain shaft Set the connecting rod pin as follows Caution Danger of injury Switch off the main switch Before starting the setting operation wait until the motor stops Remove the front guard Loosen the screw 1 of the connecting rod 3 pin 2 Set the pin into the corresponding position and tighten anew the screw The correct position is given by the flat on the pin 2 on which the screw 1 is tightened 3 2...

Page 10: ...tween the needle and the edge of the piercing hole must be the same both at the beginning and at the end of the needle feeding Caution Danger of injury Switch off the main switch Before starting the setting operation wait until the motor stops According to the table 11 2 limit for the respective sewing category the maximum stitch length see 3 5 2 4 Set the maximum stitch length Loosen the screw 1 ...

Page 11: ...ed by the dynamometer 2 as it is shown on the illustration The size of this force differs according to the category of sewing and is indicated in the par 12 2 The tension of the auxiliary tensioner is regulated using the nut 3 It should be the least possible but sufficient for unthreading the thread from the sewn material when removing the sewn material from the pressing element without leaving th...

Page 12: ... thread limiter The thread limiter is to be set in such a way that when sewing and passing the thread through the most distant point of the hook the spring 2 shifts by about 3 4 to 1 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 sew...

Page 13: ...andwheel 2 and lock it with the screw 5 which is included in the accessory of the machine tighten it carefully Insert the setting stick 3 into the hole in the eccentric 1 and prop it against the feeding shaft 4 Shift axially the eccentric on the shaft up to its extreme position to the right or to the left and place it in the medium position Tighten the screws of the eccentric 6 to the utmost one s...

Page 14: ...irst 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 ball 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 until the pin 6 of the knob ...

Page 15: ...at profiled spring 2 against the cover of the clutch 1 In the position when the wedge is disengaged the star 4 is pushed against the plate 5 lining and at the same time the friction connection with the cover of the clutch 1 is disconnected 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 ...

Page 16: ...he 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 the ...

Page 17: ...s attained but only to the measure of not deteriorating the beginning of sewing after the carried out thread trimming With every correction of the teeth height the tension 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...

Page 18: ...ghten the screw 4 Setting the force of the top roller 1 In screwing in the screw 2 the force of the top roller is increased and inversely 3 6 Feeding mechanism of the top roller 3 6 1 Description The starting movement for the drive of the top roller feeder is the bottom feeding shaft From this shaft the movement is transmitted by the indented belt 1 onto the top feeding shaft 2 A component part of...

Page 19: ...setting thereof 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 o...

Page 20: ...ay that it is possible to remove the indented belt 23 from the arm of the machine Replace the belt with a new one and proceed to the assembly inverted procedure of dismantling Proceed to the setting operation according to the par 3 6 2 3 6 3 and 3 6 4 3 6 6 Setting the feeding difference The size of feeding by the driven top roller is regulated by means of a regulating screw The top roller feeding...

Page 21: ...h the diameter of 25 mm and with the diameter of 35 mm The suitability of the diameter used depends on the type of sewing and on the concrete technological operation There are in general valid the following principles for the selection of the wheel diameter ø 25 mm for sewing small radii ø 35 mm for sewing straight sections or big radii for sewing with great passages to thicker materials 3 6 8 2 F...

Page 22: ...ement of the top roller When replacing the top roller proceed as follows Caution Danger of injury Switch off the main switch Before starting the setting operation wait until the motor stops Unscrew the screw 1 Unscrew the screw 3 with the washer 2 Remove the driven top roller with the holder 4 from the holder 5 and from the articulated shaft 8 Mount another top roller in inverted procedure to dism...

Page 23: ...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 24: ... the hook is blocked but the clutch does not disengage the disengaging moment of the clutch is to be reduced in turning the screws to the left Caution The clutch guarantees only one mutual position of the hub of the lower shaft 2 and that of the belt wheel 1 No checking according to the gauge marks is needed Putting the clutch out of operation by excessive tightening of the screws 3 can cause when...

Page 25: ...ey 4 Tension the belt and mount the dismantled components in the inverse order 3 11 V belt motor head 3 11 1 Tensioning Caution Danger of injury Switch 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 t...

Page 26: ...3 12 2 Refilling oil For lubricating the machine oil Esso SP NK 10 is used or other oil with 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 reservoir 1 is to be filled up to the half of its ...

Page 27: ...p against the bracket 5 and at the same time the 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 t...

Page 28: ... 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 Caution ...

Page 29: ...of the hook 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 moving trimming knife 4 9 Setting switching of the electromagnets The electromagnets of the trimming device and loosening of the tensioner must work in accordance with the diagram This is ensured by se...

Page 30: ...f the eccentric 1 Set the distance of the knife towards the needle plate insert using the screw 8 which can be turned after having loosened the screw 9 Set the knife with the minimum clearance between the cutting edge and the edge of the needle plate insert Set the movement of the knife in such a way so that the movement of its cutting edge is evenly distributed with regard to the centre of the pi...

Page 31: ... necessary to mind the setting of clearance in the forking of the lever 3 where a sufficient clearance must be between the safety ring and the top surface of the lever 3 and the support plate and the inner surface of the lever 3 forking With the set up maximum and minimum height of the knife which is done by means of the eccentric 10 it is necessary to check up whether the pin 6 with a hexagonal n...

Page 32: ...ust be set in such a way that it enables the maximum stitch length when sewing in forward and in rearward sense If this position is not correct the length of the stitch will be shortened in one or the other feed direction 7 2 Electromagnet height setting Caution Danger of injury Switch off the main switch Before starting the setting operation wait until the motor stops Set the maximum stitch lengt...

Page 33: ...nts of the machine head 9 Drive control panel position sensor The detailed information concerning the drive the control panel and the setting of the position sensor is given in the manual of the drive and of the control panel 10 Lighting 10 1 Mounting on the machine head Caution Danger of injury Switch off the main switch Before starting the setting operation wait until the motor stops Mount the l...

Page 34: ...sewing 3 medium heavy duty sewing In the factory where this machine has been manufactured the machine has been set with respect to the standard parameters of the required sewing category which is designed by the number included in the commercial designation of the machine If the user desires changing the given setting to another sewing category this operation should be performed by a specialized m...

Page 35: ...retaining spring of the trimming device according to the paragraph 4 7 6 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 shuttle from the needle according to the paragraph 3 1 3 7 There are in use various types of feeders with the purpose of avoiding imprinting the teeth in the lining leathe...

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