Minerva Boskovice 4181i-1 Instructions For Service Manual
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Summary of Contents for Minerva Boskovice 4181i-1
- Page 1 Instructions 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 www.promelectroavtomat.ru Edition: 02/2005 Printed in Czech Republic S735 000674...
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Page 2: Table Of Contents
CONTENTS: General safety instructions ................................1 Introduction ......................................1 Head of the sewing machine ................................2 3. 1 Hook and hook post ................................2 3.1.1 Description 3.1.2 Height setting of the hook 3.1.3 Setting the distance of the hook from the needle 3.1.4 Angular setting of the hook (timing) 3.1.5... - Page 3 Bobbin winder ..................................2 0 3.8.1 Description 3.8.2 Setting the bobbin winder stop 3.8.3 Setting the friction gear Safety clutch ..................................2 1 3.9.1 Description 3.9.2 Setting the disengaging moment 3.10 Indented belt transmission ..............................2 1 3.10.1 Setting the tensioning roller of the indented belt 3.10.2 Replacing the indented belt 3.11...
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Page 4: General Safety Instructions
1. General safety instructions The non-observance of the following safety instructions can cause bodily injuries or damages to the machine. 1. The machine must only be commissioned of the instruction book and operated by persons with appropriate training. 2. Before putting into service also read the safety rules and instructions of the motor supplier. 3. -
Page 5: Head Of The Sewing Machine
3. Head of the sewing machine 3.1 Hook and the hook post 3.1.1 Description The hook (1) is mounted on the shaft (2) and is driven by the gear (3) from the shaft (4). The shaft of the hook (2) is mounted on the top in a sliding bearing and, on the bottom, in a needle bearing. -
Page 6: Angular Setting Of The Hook (Timing)
3.1.4 Angular setting of the hook (timing) The hook is to be angularly set in such a way that the hook point (1) is opposite the needle at the moment, when the needle shifts by 2.5 mm from its bottom dead center. This corresponds to the 2O5 ° on the scale of the handwheel (3). -
Page 7: Setting The Regulation Of The Hook Lubrication
3.1.7 Setting the regulation of the hook lubrication By turning the lubricating tube (1) in the sense of the arrow (2), the size of the contacting surface between the wick (3) and the felt insert (4) is regulated. In this way, the speed of the capillary lift of oil into the felt insert (5) is influenced, from which oil is wiped on the surface (6) and is driven by centrifugal force into the hook path (7). -
Page 8: Dismantling Of The Hook Post
3.1.10 Dismantling of the hook post When dismantling the post (1), the supplies of lubricating oil are to be disconnected first, the fastening screws unscrewed and, thereafter, the post is removed. Caution ! Danger of injury! Switch off the main switch! Before starting the setting operation, wait until the motor stops! - Remove the covers of the post. -
Page 9: Height Setting Of The Needle Bar
3.2.3 Height setting of the needle bar At the moment, when the hook point passes around the needle, the upper edge of the needle eye must be about 1 mm below the hook point. In an opposite case, it is necessary to set the height of the needle bar as follows: Caution ! Danger of injury! Switch off the main switch! Before starting the setting... -
Page 10: Throat Plate And Its Post
3.3 Throat plate and its post 3.3.1 Description The throat plate (1) is equal for all categories of sewing. In the throat plate there is fixed by means of two screw (3) the exchangeable throat plate insert (2). Each category of sewing has its own insert of the throat plate which differ one from another by the length and width of the piercinghole. -
Page 11: Thread Tensioners And Limiter
3.4 Thread tensioners and limiter 3.4.1 Description The main tensioners (1) serves for creating the tension of the thread when tightening the stitch. The auxiliary tensioner (2) reduces the risk of pulling out of the thread after the thread trimming when removing the sewn material, when the thread is passed through this material and when the main tensioner is relieved. -
Page 12: Setting The Adapting Spring
3.4.4 Setting the adapting spring The mechanism of the adapting spring is in the machine arm set by the pin (1) and fixed by the screw (2). The axial adjustment shall ensure that the surfaces of the parts (3) and (4) are aligned (the threaded thread must in no place break on edges). -
Page 13: Feeding Mechanism Of The Needle Feed And Of The Lower Feed Wheel
3.5 Feeding mechanism of the needle feed and of the lower feed wheel 3.5.1 Description The feeding mechanism is formed by the leverage (1) which is driven from the main shaft through the eccentric with connection rod (2). The feeding motion is transmitted by the shaft (3) on the clutch of the bottom feed (7). -
Page 14: Forward And Rearward Stitch Length Distribution (Fine)
3.5.2.3b Forward and rearward stitch length distribution (fine) When setting the maximum length of the stitch, the forward and the rearward stitch length must be equal with the maximum error of ± 5 %. This setting can be done only after having set the needle bar holder in the direction of sewing (par. -
Page 15: Lower Feed Wheel
3.5.3 Lower feed wheel 3.5.3.1 Feeding clutches 3.5.3.1.1 Description The feeding clutch is formed by the clutch cover (1) driven from the connecting bar (2), by the clutch star (4) driven from the connecting rod (3) and by the carrier plate (5) firmly connected with the shaft (6). Of the clutch give the connecting rods (2 and 3) an opposite direction swinging movement. -
Page 16: Setting Of The Lower Eccentric
3.5.3.1.3 Setting of the lower eccentric The rotation of the eccentric (3) must be delayed in phase by 1/4 revolution against the rotation of the eccentric of the stitch length. This corresponds to the angle of 244 ° on the handwheel (1), when the setting pin (4) is put into the eccentric (3) which is in contact with the indented belt (5). -
Page 17: Height Setting Of The Feeder And Tensioning Of The Chain
3.5.4.2 Wheel feeder and its post 3.5.4.2.1 Height setting of the feeder and tension- ing of the chain The wheel feeder (1) is to be set in such a way that the points of its teeth overtop the insert of the throat plate by „X“= 0.3 to 0.7 mm. When sewing soft and thick materials, it is necessary to increase the value „X“, until a good quality of feeding is attained, but only to the measure of not deteriorating the beginning of sewing after the carried out thread... -
Page 18: Replacement Of The Feeder
3.5.3.2.2 Replacement of the feeder For the replacement of the wheel feeder (change of the wheel feeder according to the machine setting - see par. 11.2 - setting of the machine - feeder - pitch of the teeth). Caution! Danger of injury! Switch off the main switch! Before starting the setting operation, wait until the motor stops! - Unscrew the screws (1) and remove the throat plate (2). -
Page 19: Side Setting Of The Indented Lower Pulley
3.6.2 Side setting of the indented lower pulley The pulley must be set up in such a way that the belt passes through the centre of the passing hole in the bedplate. The setting operation 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! -
Page 20: Replacement Of The Indented Belt
3.6.5 Replacement the indented belt Before replacing the indented belt, the bottom feeding shaft is to be removed. The procedure is as follows: Caution! Danger of injury! Switch off the main switch! Before starting the setting operation, wait until the motor stops! - Loosen the screw (1) of the tensioning roller (2) and loosen it. -
Page 21: Top Roller
3.6.6 Top roller 3.6.6.1 Selection of the top roller diameter The machine can be supplied with two types of top roller, namely with 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. -
Page 22: Replacement Of The Top Roller
3.6.6.4 Replacement 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 (6). -
Page 23: Bobbin Winder
3.8 Bobbin winder 3.8.1 Description The winder (bobbin winder) winds a reserve of the hook thread. It is driven by a spring-mounted friction gear, which stops after having filled the bobbin. An ideal winding is attained with a sufficient pretension of the thread obtained on the thread guide (4) and with 1 mm under the diameter of the bobbin. -
Page 24: Safety Clutch
3.9 Safety clutch 3.9.1 Description The machine is provided with a safety clutch which enables the turning through of the lower belt wheel (1) on the hub of the lower shaft (2), when the hook is blocked. This blocking occurs due to the penetration of thread into the hook path. -
Page 25: V-Belt, Motor - Head
3.10.2 Replacing the indented belt To observe: in machines with Mini-stop first remove the driving toothed belt as instructed in par. 3.12. When replacing the indented belt, the mutual position of the pulleys (4 and 5) should be maintained. Caution! Danger of injury! Switch off the main switch! Before starting the setting operation, wait until the motor stops! - Remove the handwheel, the belt guard and the V-belt. -
Page 26: Lubrication
3.13 Lubrication 3.13.1 Description From the oil tank (1) there issue three suction wicks. The wick (2) lubricates the pin of the thread mechanism, the wick (3) lubricates the needle mechanism and the wick (4) lubricates the stitch length mechanism. The superfluous oil from the needle and thread mechanisms is sucked off by the wick (5) and lubricates the shifting wedge of the feeding clutch. -
Page 27: Thread Trimming
4. Thread trimming 4.1 Description of the trimming mechanism During the trimming cycle, the moving trimming knife (1), in an opportune moment, hooks up the sewing threads and pulls them in the sense of the arrow (A) against the fixed knife (2) until the threads are trimmed. -
Page 28: Setting The Fork
4.4 Setting the fork In the starting position of rest of the trimming mechanism, when the holder (1) is in contact with the bracket (2), the axis of the fork (3) must intersect the axis of the shaft (4). Caution! Danger of injury! Switch off the main switch! Before starting the setting operation, wait until the motor stops! - Shift the shaft (5), until the holder (1) strikes the bracket (2). -
Page 29: Setting The Retaining Spring Of The Hook Thread
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. -
Page 30: Material Edge Trimming
5. Material edge trimming 5.1 Description of the trimming mechanism The trimming mechanism is a component part of the hook post. The movement of the trimming knife (1) is adjustable within the extent of 1,2 – 4,3 mm. It is derived from the proper (motor) drive (2), from the compensating clutch (3) by means of the eccentric (4) and the eccentric shaft, the connecting rod (5) and the leverage (6) with the possibility of an immediate switching-off by means of the switch off plate (7). -
Page 31: Setting Of The Knife Position (Turning) In The Sewing Direction
5.4.2 Setting of the knife position (turning) in the sewing direction When sewing models with big curves, the knife is to be set in such a way, so that the trimming corner (B) in its front dead centre is at the level of the needle when it enters into the throat plate (standard setting). -
Page 32: Setting Of Engaging And Disengaging Of The Trimming Mechanism, Of The Angaging And Carried Lever Stop
5.5 Setting of engaging and disengaging of the trimming mechanism, of the engaging and carried lever stop 5.5.1 Description The material trimming mechanism is formed by a moving part - lever (1) on the shaft, which is connected by means of the lever (2) and the connecting rod (3) with the trimming mechanism drive, and by a carried part - lever (4), the component part of which is also the knife holder (6) by means of the shaft (5). -
Page 33: Setting Of The Trimming Mechanism Engagement
5.5.5 Setting of the trimming mechanism engagement When engaging the trimming mechanism still before fitting the pawl (1) into the slot in the lever (2) there is to be the clearance “A” = 0,01 up to 0,05 mm and the clearance “B” = 0,5 up to 0,6 mm. Caution! Danger of injury! Switch off the main switch! Before starting the setting operation, wait until the motor stops! -
Page 34: Lifting The Top Roller By Electromagnet
Caution! Danger of injury! Switch off the main switch! Before starting the setting operation, wait until the motor stops! The dismantling operation is to be done in the position – trimming mechanism out of function. - Remove the knife guard (1) and screw in anew its attachment screw. - Loosen the screw (2) and remove the complete holder (3) together with the trimming knife (4) from the shaft (5). -
Page 35: Backtacking Using Electromagnet
7. Backtacking using electromagnet 7.1 Description The position of the electromagnet with regard to the backtacking lever must 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. -
Page 36: Maintenance (Table Of Operations)
Maintenance Caution! Danger of injury! The maintenance operations should be performed only with the machine switched off and with the motor stopped! In the following table there are given the operations which should be performed and the respective time intervals between the individual operations. Operation Time interval Removal of the throat plate and its cleaning out.Cleaning out of the wheel feeder, hook and their... -
Page 37: Table Of Setting The Machine According To The Sewing Category
11.2 Table of setting the machine according to the sewing category 4181i - 1XX - X Commercial designation of the machine S e w i n g Standard sewing parameters Standard machine setting cate- Needle S e w i n g Position W i d t h Feeder...
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