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Mitsubishi Electric PLK-J10050RH, Technical Manual

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Mitsubishi Electric PLK-J10050RH Technical Manual Download Page 21

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5-9. Adjustment of the thread tension 

(1) Adjust the bobbin thread tension with the thread tension adjusting screw (No.2) on the inner hook 

(No.1). The thread tension become loose if turn the thread tension adjusting screw (No.2) to the 

counterclockwise, and the thread tension becomes tight if turn it to the clockwise. 

 

 

 

 

 

 

 

 

 

 

 

5-10. Adjustment of upper thread tension 

Adjust  the  upper  thread  tension  corresponding  to  the  bobbin  thread  tension.  The  upper  thread  tension 

becomes tight when tightening the thread tension adjusting nut (No.1) clockwise, and the upper thread 

tension becomes loose when loosening the thread tension adjusting nut counterclockwise. 

NOTE  It  is  possible  to  adjust  the  upper  thread  tension  automatically.  Please  refer  to  the  instructions 

OPERATION PANEL technical manual concerning about [Digital tension]. 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

<1>: Inner hook 

<2>: Adjusting screw 

<1>: Thread tension adjusting nut

 

<1> 

<2> 

<1> 

Summary of Contents for PLK-J10050RH

Page 1: ...INDUSTRIAL SEWING MACHINE MODEL PLK J10050RH TECHNICAL MANUAL SEWING MACHINE HEAD A180E836P01 ...

Page 2: ...to a serious consequence according to the circumstances Always follow the instructions of both levels because they are important to personal safety CAUTION INDICATIONS No Caution indication Description 1 Precaution for sewing machine operation Indicates that removing the safety and operating the sewing machine for some other purposes with power on are prohibited Please do not operate the sewing ma...

Page 3: ... corrosive gas 7 In the place where the fluctuation in the power voltage of 10 or more than 10 or the power voltage of 10 or less than 10 of the fixed power voltage 8 In the place where the power source cannot supply enough voltage to keep the motor running 9 In the place filled with strong electric noises such as high frequency welders INSTALLATION 1 Please have some specialists who have enough e...

Page 4: ...ouch the operating parts during sewing operation 9 It is very dangerous to operate the sewing machine without safety guards eye guards belt covers link covers finger guards or the others Please make sure to operate the sewing machine with safety guards 10 Please make sure to turn the power switch off when stopping the sewing machine temporarily ADJUSTMENT 1 Please make sure to turn the power switc...

Page 5: ...oor 5 5 Setting the bobbin 5 6 Setting the inner hook 5 7 How to operating the jig eject system 5 8 Operation of the halt switch 5 9 Adjustment of the thread tension 5 10 Adjustment of upper thread tension 8 9 10 11 12 12 13 14 15 15 6 STANDARD ADJUSTMENT 16 6 1 Adjustment of the needle bar position 6 2 Adjustment of the position between the needle and the rotating hook 6 2 1 Adjustment of the cle...

Page 6: ...ead trimmer 7 5 1 Adjustment of the movable knife 7 5 2 Adjustment of the fixed knife 7 5 3 Adjustment of the trimmer cam detector position 7 6 Adjustment of the XY table detector 7 6 1 Adjustment of X direction 7 6 2 Adjustment of Y direction 7 7 Adjustment of the Y timing belt tension 28 30 33 36 37 37 38 39 40 42 43 44 8 MAINTENANCE 45 8 1 Cleaning 8 2 Greasing 8 3 Disposing of oil waste 45 45 ...

Page 7: ...LK J10050RH electronic pattern sewing machine consists of the following main parts 1 Sewing machine head 2 Halt switch 3 Control box 4 Operation panel 5 Work holder switch 6 Start switch 7 Thread stand 8 Sewing machine table 1 2 3 4 5 6 7 8 ...

Page 8: ...8 mm Thread take up lever stroke 100 mm Presser foot drive Direct drive by stepping motor Presser foot lift 15 0 mm max 30 0 mm Variable in 0 1 mm step Presser foot stroke Digital adjustment stroke 0 0 to 10 0 mm Upper thread tensioner Manual automatic Setting on pattern switchover Oil lubrication Spray method Spray time adjustment Operation panel 6 5 inch color LCD touch panel with USB port Exter...

Page 9: ...erate until the sewing machine is repaired when any damage or fault is found on the sewing machine at the installation 4 Please do not refurbish the sewing machine 3 1 Installation of the foot switch Connect the foot switch to the connector CON L The foot switch is enclosed in the accessory box NOTE Refer to the instructions in the paragraph 4 Name of each part wiring and grounding in the CONTROL ...

Page 10: ...Assemble the parts of the thread stand as shown on the figure 2 Fit the thread stand into the hole at the far right on the machine arm with the nut No 14 and the washer No 12 and cushion No 13 1 Air tube 8mm Diameter 2 Filter regulator 3 Intake air fitting 4 Air coupling 4 3 1 2 1 Upper column pipe 2 Lower column pipe 3 Spool stand base 4 Spool mat 5 Spool holder 6 Spool shaft 7 Spring washer 8 Nu...

Page 11: ...djust foot and floor which included in accessory box For the other three rubber cushions the procedure is same 2 Screw the adjust foot No 2 in the direction of b arrow and adjust the adjust foot height so that the each four caster No 3 is to be raised from the floor by several millimeters After adjustment please check if there is no inclination about the machine table 1 Eye guard unit 2 Screw 1 2 ...

Page 12: ... machine table Turn the adjust pad No 3 in the direction of arrow in below figure and adjust the stand height up to lightly contact with bottom surface of the table After adjustment tighten the lock nut No 4 NOTICE After finish the preceding work 3 5 Installation of the rubber cushion install the table stand No 1 1 Table stand 2 Machine table 3 Adjust pad 4 Lock nut 2 1 1 3 4 2 View from table bot...

Page 13: ...oil by mistake NOTICE Please make sure to lubricate when operating for the first time after the installation Also please make sure to check the amount of oil when the machine has not been used for a long time 4 1 Filling the oil tank Pour the oil through the oil hole No 1 to the oil tank No 2 on the machine arm Pour the oil through the oil hole No 3 which has machine table to the oil tank No 4 Ple...

Page 14: ...or the fingers not to be injured by the needle point 1 Attach the needle holder No 2 to the needle bar No 1 then insert a new needle No 3 until the needle head is reached the end of the guide groove of the needle bar No 1 2 Tighten the set screw No 5 with facing the needle groove No 4 to the front 1 3 4 5 2 1 Needle bar 2 Needle holder 3 Needle 4 Needle groove 5 Set screw ...

Page 15: ... 9 5 2 Threading the needle thread CAUTION 1 Please turn the power switch off when threading a needle 1 Thread the needle thread as shown on the figure ...

Page 16: ...p on the work holder foot switch first and then the start switch second so that the thread continues winding to the bobbin while the start switch is stepped on 4 When the bobbin finishes winding a certain amount 80 to 90 of the outside diameter of bobbin of thread the bobbin presser arm is returned to the initial position Adjust the amount of the winding thread with the subsidiary arm No 4 5 To wi...

Page 17: ...ction of the arrow which has front lower side of the table The bobbin access door opens when opening switch No 2 becomes state in B showing in below figure 2 When closing the bobbin access door No 1 turn the opening switch No 2 in the opposite direction from state in B NOTE When start the sewing unless the bobbin access door No 1 is opened the start prohibition signal is valid 1 Bobbin access door...

Page 18: ...gain to get the proper rotation 5 6 Setting the Inner hook 1 Pull the bobbin thread about 30 mm out of the thread hole of the inner hook No 1 2 Open the bobbin access door 3 Open the hook holding arm No 2 in the arrow direction 4 By Inserting the top of inner hook No 1 between the hook positioner No 3 and hook No 4 set the inner hook No 1 securely 5 Close the hook holding arm No 2 for preventing c...

Page 19: ...stem actuated Please make sure if the work holder is fixed securely after step on the foot pedal The work holder is not fixed due to the insufficient actuation of locate pin No 4 when either or both cassette jig are not installed enough NOTE Please make sure if the bottom surface of cassette jig A and lower plate No 5 are in same level If different loosen the each four of Jig eject system install ...

Page 20: ...immediately The sewing machine stops instantly 2 To cancel the halt state press the halt switch again 3 When continuing sewing step on the grey foot switch to restart at the halted position Press the jogging in forward reverse direction icon so that the sewing start position will move 4 To cancel sewing press the home position return icon 1 Halt switch 1 ...

Page 21: ...r thread tension Adjust the upper thread tension corresponding to the bobbin thread tension The upper thread tension becomes tight when tightening the thread tension adjusting nut No 1 clockwise and the upper thread tension becomes loose when loosening the thread tension adjusting nut counterclockwise NOTE It is possible to adjust the upper thread tension automatically Please refer to the instruct...

Page 22: ... 4 by hand in the direction of arrow and stop the needle bar No 5 at the lowest position NOTE The needle shaft and the hook shaft are controlled by synchronous operation only when the power switch is on In this reason there is a risk that the needle may collide with hook when down the needle bar without removing the needle 3 Make sure the clearance between the bottom of needle bar No 5 and top of ...

Page 23: ... lever No 3 by entering the locate pin witch have driving lever No 3 into the trimmer lever No 4 hole When remove the trimmer lever No 4 hold the trimmer lever No 4 by hand as in the below drawing and lift the sliding plate No 1 The trimmer link No 4 is removed from the driving lever No 3 smoothly 4 To entering the locate pin witch have driving lever No 3 into the trimmer lever No 4 hole smoothly ...

Page 24: ... the clearance between the hook point and the needle to be about 0 05 mm 8 Hold the hook and tighten the three hook set screws No 9 securely In this time please make sure if the hook set screw No 9 nearest of hook point to be positioned with screw setting face No 10 of the lower shaft The screw setting face No 10 can be seen from the front side in a state that the inner hook is removed 6 Hook poin...

Page 25: ...the two screws No 6 and remove the detector cover No 5 2 Insert the hexagon wrench from the detector cover No 5 opening and loosen the set screw No 3 which has detector plate No 2 3 Remove the all of any parts tools and screws on the sliding table After make sure the work environment safety Turn the power switch on At this time do not press the home position return icon 6 5 2 1 7 3 4 a 1 Main shaf...

Page 26: ...sition upper and move only the detector plate No 2 little by little in the direction of arrow from the state of A as showing in below drawing Stop the detector plate No 2 and tighten the screw No 3 at the position where the detection lamp lighted which has main shaft detector No 1 In this state the detector plate No 2 is in the state of B 7 After adjustment attach the detector cover and continue t...

Page 27: ...ower switch the hook and needle timing information is stored This timing information cannot be overwritten when the power switch turned on In this reason please operate this adjustment before press the home position return icon 1 Press the icon from the function mode 2 Input the pass word and press the icon NOTE If press the home position return icon the icon is displayed with shading and cannot d...

Page 28: ...ar becomes up position After the completion of setting press the icon and then press the icon NOTE The angle indication becomes zero degree when the main shaft detector detect the detector plate For the adjustment of the main shaft detector see the previous paragraph 6 2 2 5 Press the sub motor hook position setting icon Main shaft detector angle indication ...

Page 29: ...con After completing the origin return operation press the on the standard screen Turn the hand pulley by hand and make sure the timing between hook and needle motion is performed sufficiently as described above 8 After adjustment turn the power switch off 9 After adjustment put the sliding plate and bobbin case to the original locations and close the bobbin access door 10 When put the sliding pla...

Page 30: ...ssary loosen the hook positioner set screw No 5 and adjust the hook positioner No 1 position 5 After the adjustment put the sliding plate back on the sewing machine NOTE When put the sliding plate back on the sewing machine in order for the needle to come into the right center of the needle hole of the needle plate make sure that the needle plate hole center matches with the needle point Refer to ...

Page 31: ...thousand stitches Rotating hook one second for every five hundred stitches NOTE1 Please adjust the oiling amount for each sewing condition For example increase the OL1C OL2C value or shorten the oil injection time OL1T OL2T when much oil is consumed However it is necessary to note the machine seizing when limit the oiling amount NOTE2 When shorten the oil injection time OL1T OL2T set the value to ...

Page 32: ...ke Please refer to 17 Easy setting 1 6 PF motion setting 3 Adjustment of the presser foot lift Please refer to 17 Easy setting 3 5 PF rising position adjustment 6 6 Adjustment of the thread take up spring 6 6 1 Adjusting movable range of the thread take up spring 1 To adjust the movable range of the thread take up spring No 3 loosen the set screw No 2 and turn the whole thread take up spring unit ...

Page 33: ...e standard tension loosen the adjust bushing No 2 and reduce the tension of take up spring to 0 then tighten the adjust bushing No 2 from that position 6 7 Adjustment of the air pressure CAUTION If the secondary side air pressure is set too high trouble such as operation faults may occur Always set the pressure to within 0 4Mpa 1 Air pressure is provided from an air source Lift and turn the air re...

Page 34: ...ink covers and finger guards or the others back on the initial position after the sewing machine adjustment 7 1 How to exchanging the tension spring of the needle thread tensioner unit According to following procedures exchange the tension spring No 1 NOTICE It is required to use the factory original tension spring 1 Turn the thumb screw No 2 and decrease the tension spring pressure 2 Loosen the s...

Page 35: ...rew No 4 and screw No 3 in order NOTE 1 Bearing No 6 is consist of three parts Please taking care not to make misassembling by referring following figure NOTE 2 Locate the groove of the tension disc No 9 to the thread release pin No 11 when removed tension disc No 9 No 10 1 Tension spring 2 Thumb screw 3 Set screw 4 Set screw 5 Tensioner shaft 6 Bearing 7 Bearing holder 8 Washer 9 Tension disc 10 ...

Page 36: ...of the sliding plate NOTICE The presser foot movement is based on the origin detection position To prevent the sewing trouble and parts breaking adjust the detector position exactly 1 Remove the eye guard No 1 by referencing the previous paragraph 3 4 Installation of the eye guard 2 Remove the three of fixing screws No 2 and remove the face cover No 3 3 Remove the needle No 4 1 Eye guard 2 Fixing ...

Page 37: ...ial set value b Press the from standard screen and check if the presser foot lifting value is 15 0 mm If different please change to the initial set value 15 0 mm c Press the Presser foot ZNPP Distance from PF sensor edge to the top surface of slide plate Check if the value is 300 30 0 mm If different please change to the initial set value 300 d For prevent the detection error please use the factor...

Page 38: ...oosen the fixing screw No 6 and move downward the detector bracket No 7 and tighten the screw again and press the origin return icon NOTICE Please be careful not to step on the foot switch by mistake 8 Continue the above adjustment up to be a correct distance 15 mm NOTICE From the second home position returning it does not use the home position return sensor Make sure to turn the power switch off ...

Page 39: ...he standard presser foot only at needed it is necessary to change the ZNPP Distance from PF sensor edge to the top surface of needle plate from default value For example to using a special presser foot which length is 2 mm longer change the value to 280 28 0 mm from default value 300 30 0 mm as showing in the following figure According to the following procedures change the ZNPP value 1 Press the ...

Page 40: ...Press the icon and down the presser foot to the top of the needle plate In this time set the gap between bottom of presser foot and top of needle plate to be 0 to 0 2 mm The screen indicates ZNPP default value Upper and current value Lower NOTE The ZNPP value can be set every 0 1 mm 30 0 28 0 15 0 15 0 15 0 ...

Page 41: ... 5 After the completion of setting press the memory icon and then press the icon NOTE The ZNPP value is flickering until press the icon 6 Following the screen indication put the power switch off 30 0 28 0 ...

Page 42: ...r lower No 4 position 4 After adjustment make sure if the presser foot No 7 is remaining on the sliding plate On the other hand adjust the presser foot hole position to the needle No 8 with turning the presser bar 5 Then tighten the each of set screws No 5 securely while holding the block No 9 by both presser foot holders No 3 No 4 and make sure if there are no gap between both presser foot holder...

Page 43: ...n a virtual plane of the machining surface of sliding plate No 4 as below figure In this time keep aligning the center of the trimmer link hole No 2 and the reference hole No 3 4 If different loosen the screw No 6 and adjust the tip of movable knife No 5 position by moving in the arrow direction In this time keep aligning the center of the trimmer link hole No 2 and the reference hole No 3 too 5 A...

Page 44: ...ixed knife No 1 and edge of the needle plate No 2 is 1 5 mm 2 If different loosen the screw No 3 and adjust the clearance NOTE If the clearance is smaller than 1 5 mm it may cases any trimming failure or unstable trimming length 1 Fixed knife 2 Edge of the needle plate 3 Screw 3 1 1 5mm 2 ...

Page 45: ... home position icon from standard screen 3 After finish the origin movement please check the clearance from A direction between trimmer cam No 1 and cam roller No 5 is 0 5 mm or less NOTE It is necessary readjust the detector position when the trimmer cam No 1 contact with cam roller No 5 In this case movable knife position may different 4 Turn the machine power off and loosen the two of the screw...

Page 46: ... above position After detection XY table is back to the home position as shown in the following figure NOTE When modify the home positon somewhere other than the center of sewing area please refer to the instructions OPERATION PANEL technical manual 17 Easy setting 3 8 1 X detect plate 2 X detector 3 Y detect plate 4 Y detector 5 Needle Home position Detecting positon 5 2 4 1 3 5 500 10 1000 500 5...

Page 47: ...ing it does not use the home position return sensor Make sure to turn the power switch off to change the mechanical home position To use the sensor from the second returning press Home returning method since the second time returning on the standard screen and set it ON 1 X detect plate 2 X detector 3 Y detect plate 4 Y detector 1 2 Detecting position of X direction 3 4 Detecting position of Y dir...

Page 48: ...ction When less than 271 mm move the X detector No 2 in arrow a direction 4 After adjustment tighten the screw No 10 and check again above 1 to 3 procedures 5 Confirm the clearance between detector and detect plate is in the range of 1 to 1 5 mm If it has any damage with detector or the detect plate this clearance may different NOTICE For the safety turn the power switch off every time NOTE The fa...

Page 49: ...5 mm move the Y detector No 2 in arrow a direction 5 After adjustment tighten the screw No 13 and check again above 2 to 4 procedures 6 Confirm the clearance between detector and detect plate is in the range of 1 to 1 5 mm If it has any damage with detector or the detect plate this clearance may different NOTICE For the safety turn the power switch off every time NOTE The factory default XY table ...

Page 50: ...o 7 tension will be increased 5 After the adjustment tighten the screws No 8 When loosening the screws No 8 according to above procedure 3 please note that the screws being excessively loosed In this case the timing belt tension may increase when tighten the screws No 8 6 By the same procedures adjust the opposite side of timing belt tension Reference Y timing belt tension has been adjusted by 550...

Page 51: ...t or the like sticking absorbs lubrication oil on the rails and significantly lowers the slide guide running life Remove the dust and the thread waste sticking regularly and greasing every six months 2 For the guide rail grease to the both side of guide groove For the ball screw shaft grease to the surface of shaft After greased apply the grease uniformly by moving the XY table by hand 1 X guide r...

Page 52: ...lowing units which consisted by gear mechanism NOTE Remove the face cover and other covers in advance 5 Rack gear which has presser foot unit 6 Gear of the needle thread tensioner drive unit Recommended grease Molybdenum disulfide grease 5 6 ...

Page 53: ... 47 8 3 Disposing of oil waste If the waste oil pan is full filled in the oil bottle No 1 remove the oil bottle then dispose of the waste oil 1 1 Oil bottle ...

Page 54: ... are damaged Grind parts or change parts The needle size is bigger than the thread size Change the needle size to suitable size 5 1 Thread melts with heat Slow down the sewing speed Operation panel section Use needle cooler Bobbin thread is broken Bobbin thread tension is too tight Adjust thread tension 5 9 Parts on needle plate and presser foot touching thread are damaged Buff parts or change par...

Page 55: ...xed knife is dull Sharpen fixed knife or change fixed knife Movable knife is dull Sharpen Movable knife or change fixed knife Movable knife home position is not proper Adjust movable knife home position 7 5 1 Setting of trimming timing is not proper Adjust the trimming timing Operation panel section Trimming setting is off Turn trimming setting on Operation panel section Stitch forming is loose Up...

Page 56: ... Sewing material in work clamp slips Put slip stopper on presser plate Sewing material is too heavy Slow down sewing speed Operation panel section Y timing belt tension is loose Adjust timing belt tension properly 7 7 Returned home position is changed Ambient temperature is out of use range Use sewing machine in ambient temperature in 5 degrees to 35 degrees Clearance between detector and detectin...

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Page 60: ...Printed in Japan ...

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