JUKI LU-2810 Series Engineer'S Manual Download Page 1

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40133310

No. E407-00

ENGINEER’S MANUAL

LU-2810

Direct-drive, 1-Needle, Unison-feed Lockstitch Machine with a Vertical-axis Large Hook

LU-2810-7

Direct-drive, 1-Needle, Unison-feed Lockstitch Machine with a Vertical-axis Large Hook

with an Automatic Thread Trimmer

海外講習会用121122 LU-2810(-7)̲EM

Summary of Contents for LU-2810 Series

Page 1: ...2810 Direct drive 1 Needle Unison feed Lockstitch Machine with a Vertical axis Large Hook LU 2810 7 Direct drive 1 Needle Unison feed Lockstitch Machine with a Vertical axis Large Hook with anAutomatic Thread Trimmer 海外講習会用121122 LU 2810 7 EM ...

Page 2: ...rtant information which are not covered in the Instruction Manual When carrying out the maintenance work on the sewing machine be sure to refer also to the Instruction Manual and the Parts List In addition for the motor for the sewing machine with thread trimmer refer to the separate Instruction Manual or This manual gives the Standard Adjustment on the former page under which the most basic adjus...

Page 3: ...ng bobbin changing or oiling and cleaning 3 2 1 Electrical shock danger label DANGER This indication is given where there is an immediate danger of death or serous injury if the person in charge or any third party mishandles the machine or does not avoid the dangerous situation when operating or maintaining the machine WARNING This indication is given where there is a potentiality for death or ser...

Page 4: ...sumes no responsibility for damages or personal injury or death resulting from the machine which has been modified or altered Education and training 1 In order to prevent accident resulting from unfamiliarity with the machine the machine has to be used only by the operator who has been trained educated by the employer with respect to the machine opera tion and how to operate the machine with safet...

Page 5: ...der to prevent accident caused by earth leakage Motor 1 Be sure to use the specified rated motor JUKI genuine product in order to prevent accident caused by burnout 2 If a commercially available clutch motor is used with the machine be sure to select one with an entan glement preventive pulley cover in order to protect against being entangled by the V belt Before operation 1 Be sure to make sure t...

Page 6: ... result in personal injury or death 9 Be sure to periodically clean up the air vent of the fan and inspect the area around the wiring in order to prevent fire accident of the motor 10 In order to prevent accidents resulting in personal injury or death adjustments have to be carried out within the instructions described in this Engineer s Manual and in the Instruction Manual by the person nel who h...

Page 7: ...gainst accident that can result in personal injury In addition be sure to select appropriate tools 3 In prevention of accident that can result in personal injury make sure after the completion of adjust ment work that neither screws nor nuts are loosened or come in contact with other parts 4 Turn OFF the power before starting the work in order to protect against accident that can result in per son...

Page 8: ...en replacing any of the machine parts JUKI assumes no responsibility for any accident caused by any part other than JUKI genuine one In addition in the event you cannot replace parts within the specified range immediately stop the re placement work and ask JUKI or distributor in your area for replacement of the parts 8 If the fuse has blown be sure to turn the power off and eliminate the cause of ...

Page 9: ...er the completion of assembly work be sure to check that screws and nuts are not loosened before starting test run 6 In prevention of accident that can result in personal injury make sure after the completion of adjust ment work that neither screws nor nuts are loosened or come in contact with other parts 7 Make sure after the completion of replacement work that neither connectors nor cables are d...

Page 10: ...isconnect the power plug from the receptacle so as to ensure safety 4 If the machine is suddenly moved from a cold place to a warm place dew condensa tion may be observed In this case turn ON the power to the machine after you have confirmed that there is no danger of water drops in the machine 5 To prevent fires periodically draw out the power plug from the plug socket and clean the root of the p...

Page 11: ...chine is counterclockwise as observed from the pulley side Take care not to allow the machine to rotate in the reverse direction Never operate the machine unless the machine head and the oil tank have been filled with oil For a test run remove the bobbin and the needle thread For the first month decrease the sewing speed and run the sewing machine at a speed of 80 or less of the maximum sewing spe...

Page 12: ... trimmer device 30 1 Position of the counter knife and the clamp spring 30 2 Position of the counter knife base 32 3 Vertical position of the moving knife 32 4 Thread trimmer cam timing 34 5 Position of the thread trimmer cam 36 6 Adjusting the knife pressure 36 18 Detection switch of the amount of alternate vertical movement 38 3 Portion to which LOCKTITE is applied 40 4 Selective parts and consu...

Page 13: ... Thread take up Link thread take up 14 Needle bar stroke 40 mm 15 Alternate foot stroke 1 mm to 9 mm Alternate foot stroke adjusted by long hole 16 Hook Vertical axis 2 fold hook Latch type 17 Feed mechanism Box feed 18 Top and bottom feed actuation mechanism Timing belt 19 Thread trimming method Cam driven scissors type 20 Lubrication Automatic lubrication by oil tank with oil gauge 21 Lubricatin...

Page 14: ...caused by abrupt start of the sewing machine Standard adjustment Model Dimension E mm Gauge type LU 2810 7 5 0 1 Standard gauge type LU 2810 7 Conditions Needle bar at lowest dead point Feed amount 0 mm Height of feed dog 0 5 to 0 6 mm Highest position 1 2 2 6 2 E Top surface of 3 8 7 4 5 2 4 E 3 2 Operator s side 1 2 6 Model Dimension E mm Gauge type LU 2810 5 2 0 2 Europe gauge type LU 2810 7 Co...

Page 15: ...ont or to the rear o Stitch skipping or needle break age will result o Poorly tensed stitches will result Adjustment procedures Results of Improper adjustment 1 Set the stitch dial to 0 2 Turn the handwheel to bring the needle bar to the lowest dead point of its stroke 3 Loosen clamping screw 4 of the feed base arm 4 Adjust the clearance between throat plate 3 and feed dog 2 to dimension E then se...

Page 16: ...f the hook WARNING Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine Standard adjustment 1 3 2 A Top surface of 4 3 4 2 A 1 4 2 5 3 Model Dimension A mm LU 2810 0 5 to 0 6 LU 2810 7 Conditions Feed amount 0 mm Height of feed dog maximum Model Dimension A mm LU 2810 1 0 1 LU 2810 7 1 5 0 1 海外講習会用121122 LU 2810 7 EM ...

Page 17: ...The feed dog 3 comes in con tact with the knife and the knife and the feed dog 3 may be damaged When the height of the feed dog 3 is lower than the specified value o Stitch pitch becomes smaller than the scale of the feed dial o Feed force will be deteriorated Adjustment procedures Results of Improper adjustment 1 Loosen two setscrews 1 of the hook 2 Draw out hook 2 in the direction of the arrow 3...

Page 18: ...e sewing machine Standard adjustment 1 Clearance of inner hook guide 2 Inner hook guide timing 4 5 2 1 B 3 C A B 8 7 A 1 6 9 0 6 9 0 押し当て Model Dimension A mm LU 2810 0 7 to 0 9 LU 2810 7 Conditions When the inner hook guide travels to its back end Press the inner hook stopper against the groove in the throat plate 海外講習会用121122 LU 2810 7 EM ...

Page 19: ...se to dimension A 4 Tighten setscrew 4 of the inner hook guide arm while pressing down inner hook guide arm 5 2 Inner hook guide timing 1 Loosen setscrew 6 of the opener cam 2 Three marker dots A on the handwheel 7 aligns with marker line B on the motor cover 8 when inner hook guide 1 is in its back end position Tighten setscrew 6 of the opener cam in the state that the opener cam 9 is pressed aga...

Page 20: ...djustment 1 Height of the needle bar 2 Needle to blade point of hook timing 3 Adjusting the hook needle guard 8 A 6 7 B 2 3 1 4 5 9 C 0 6 1 6 0 2 D E d e Model Dimension A mm Dimension B mm Dimension C mm LU 2810 2 3 0 2 1 5 0 2 0 05 to 0 2 LU 2810 7 Conditions Feed amount 0 mm Needl bar rises from the lowest dead point of its stroke 海外講習会用121122 LU 2810 7 EM ...

Page 21: ... turn the hook 7 in its normal rotational direction so that center of the needle 6 aligns with blade point of the hook 7 5 Tighten clamping screw 5 of the lower shaft set collar 6 Turn the handwheel to bring so that needle bar 3 is raised from the lowest dead point of its stroke to dimension A At this time loosen clamping screw 4 of the needle bar holder to ad just so that the distance from the to...

Page 22: ...urn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine Standard adjustment 1 Hand lifter 2 3 6 1 7 Conditions State that the hand lifter is raised 4 5 10 mm 海外講習会用121122 LU 2810 7 EM ...

Page 23: ...s described in the aforementioned step 3 bring hand lifter A 6 and B 7 into the state as illustrated in the figure and tighten clamping screw 1 of the hand lifter A 5 Remove the 10 mm thick thing placed between the top surface of throat plate 4 and the under surface of presser foot 5 6 Attach the face plate When the lifting amount is higher than the specified value o The presser foot is held raise...

Page 24: ...sed by abrupt start of the sewing machine Standard adjustment 2 Knee lifter Without thread trimmer only Conditions Lifting amount when stopper screw of knee lifter rotation arm comes in contact with mahcine bed 2 3 1 1 7 6 8 9 Knee lifter rotation arm 4 5 20 mm 海外講習会用121122 LU 2810 7 EM ...

Page 25: ...nt is set at 6 5 mm or more adjust that the height from the top surface of throat plate 4 to the under surface of presser foot 5 is 16 0 5 mm Step 7 to 8 is standard gauge type only Caution 1 Check to be sure that parts of the knee lifter mechanism does not come in contact with the frame and other parts around it when the knee lifter link C 6 is positioned horizontally If the knee lifter link C 6 ...

Page 26: ... is ON never touch the switches other than the necessary one so as to prevent accidents caused by the malfunction of switches Standard adjustment 3 Automatic presser foot lifter Machine with thread trimmer only 2 3 1 6 4 5 20 mm 海外講習会用121122 LU 2810 7 EM ...

Page 27: ...ve the 20 mm thick thing placed between the top surface of throat plate 4 and the under surface of presser foot 5 6 Attach rubber cap 1 from the rear face of the machine arm Caution For the standard gauge type machine the walking foot interferes with the needle bar when the amount of the alternating vertical movement of the walking foot and the presser foot is set at 6 5 mm or more To use the mach...

Page 28: ...eedle sway Adjusting the bottom feed amount WARNING Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine Standard adjustment 1 0 9 0 1 m m 3 2 2 1 4 3 Conditions Feed amount 0 mm Amount of alternate vertical movement 3 mm Top surface of throat plate Top surface of throat plate Top surface of feed dog 海外講習会用121122 LU 2810 7 EM ...

Page 29: ...han that of the presser foot 2 in accordance with the sewing products o Sewing sponge material or the like o Sewing material with overlapped sections When the amount of alternate verti cal movement of the walking foot 1 and presser foot 2 are consider ably different o The stitch pitch is different from the value set by the dial o Decrease the number of revolu tion of the motor a little since the f...

Page 30: ... 1 Horizontal feed cam timing 2 Vertical feed cam timing No 2 screw 1 2 Main shaft 4 5 6 3 7 Lower shaft A B 4 5 6 Top end of needle 4 top surface of throat plate 5 and top surface of feed dog 6 are aligned Conditions Feed amount maximum Needle bat at lowest dead point Conditions Feed amount 6 mm When needle is lowered and feed dog is rised 海外講習会用121122 LU 2810 7 EM ...

Page 31: ...osen two setscrews 3 of the vertical feed cam 4 Turn the vertical feed cam 7 to the position where top end of the needle 4 aligns with top surface of the throat plate 5 and top surface of the throat plate 5 aligns with feed dog 6 5 Tighten two setscrews 3 of the vertical feed cam Standard When three points of top end of the needle 4 top surface of the throat plate 5 and top surface of feed dog 6 a...

Page 32: ...andard adjustment 3 Top feed cam timing Main shaft 1 6 2 3 5 4 2 3 5 4 Top end of needle 2 top surface of throat plate 3 under surface of walking foot 4 and top surface of feed dog 5 are aligned Conditions Feed amount 6 mm Amount of alternate vertical movement 3 mm When needle and walking foot is lowered 海外講習会用121122 LU 2810 7 EM ...

Page 33: ...oot 4 and top surface of feed dog 5 are aligned with one another under the condition that the amount of alternate vertical movement is equal 6 Tighten two setscrews 1 of the top feed cam 7 Attach the top cover Standard When four points of top end of the needle 2 top surface of the throat plate 3 under surface of walking foot 4 and top surface of feed dog 5 are aligned with one another the setscrew...

Page 34: ...andard adjustment 12 Position of the reverse feed control lever WARNING Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine Standard adjustment o In case of LU 2810 7 o In case of LU 2810 Conditions Feed amount 6 mm 2 4 B A 4 B 2 0 1 to 0 5 mm 3 5 4 2 2 A B 1 1 2 4 5 Notched part 2 海外講習会用121122 LU 2810 7 EM ...

Page 35: ...e feed control lever 2 is 1 0 5 mm Then tighten clamping screw 1 of the reverse feed connecting arm o In case of LU 2810 1 Set the stitch dial to the maximum 2 Loosen clamping screw 3 of the feed adjusting pin support arm 3 Turn the reverse feed lever shaft 5 to adjust so that a clear ance between the reverse feed lever plate 4 and the stopper part B of machine arm is 0 1 to 0 5 mm Then tighten cl...

Page 36: ...upt start of the sewing machine Standard adjustment 14 Balancer WARNING Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine Standard adjustment 4 4 1 Standard of release pressure Operator s side 5 1 2 Operator s side 1 3 4 2 海外講習会用121122 LU 2810 7 EM ...

Page 37: ...etscrew 2 located at the periphery of lower shaft sprocket wheel 4 and turn release pressure adjusting pin 3 to adjust the release torque After the adjustment tighten set screw 2 to fix release pressure adjusting pin 3 Standard of release pressure When the direction of the slot in release pressure adjusting pin 3 is located near the places below the relevant release pres sure is obtained o 24 5 N ...

Page 38: ...everse feed cylinder WARNING Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine Standard adjustment 1 3 5 4 2 8 0 5 mm 海外講習会用121122 LU 2810 7 EM ...

Page 39: ...e feed control lever to adjust so that the dis tance between the cylinder support 3 and the cylinder knuckle 4 is 8 0 5 mm in the state that the bottom of elongated hole of the reverse feed link 1 is in contact with the hinge screw 2 Then tighten clamping screw 5 of reverse feed arm o Stitch lengths of the reverse feed may not be obtained 海外講習会用121122 LU 2810 7 EM ...

Page 40: ...NING Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine Standard adjustment 7 9 8 B A A sheet of paper 0 2 1 1 3 5 4 2 C D Max Min 6 海外講習会用121122 LU 2810 7 EM ...

Page 41: ...Cleaning the oil pan and filter 1 Remove clips 5 to remove filter clamp 4 2 Remove filter 3 and oil pipe 1 3 Clean up filter 3 and oil reservoir C of the oil pan 2 4 Insert the oil pipe 1 and filter 3 into oil reservoir C of the oil pan 2 5 Set the filter clamp 4 to oil pan 2 and fix it with the clip 5 6 Pour the JUKI New Defrix Oil No 1 into the oil tank Caution Adjust the oil quantity so that th...

Page 42: ...ing the work so as to prevent accidents caused by abrupt start of the sewing machine Standard adjustment 1 Position of the counter knife and the clamp spring 37 0 1 mm A 3 7 0 1 mm B Mounting groove of the slide plate 4 5 1 2 To be in contact 3 海外講習会用121122 LU 2810 7 EM ...

Page 43: ...2 and adjust the distance to 3 7 0 1 mm B 4 Tighten setscrews 4 of the clamp spring Caution When the position of counter knife 3 and clamp spring 5 is moved re adjust the position of counter knife base 2 and the knife pressure When dimension A is larger o Length of bobbin thread clamp is shortened and stitch skipping occurs o Setting taking out bobbin cannot be performed When dimension A is smalle...

Page 44: ...cidents caused by abrupt start of the sewing machine Standard adjustment 2 Position of the counter knife base 3 Vertical position of the moving knife 1 2 to 1 5 mm C 3 2 5 Adjust at the center part 9 8 8 9 0 3 to 0 4 mm 7 6 0 8 2 1 4 To be in contact 海外講習会用121122 LU 2810 7 EM ...

Page 45: ...screws 7 of the moving knife shaft thrust collar 4 Tighten clamping screw 6 of the moving knife driving arm so that there is no thrust play at the moving knife shaft 0 Caution Adjust the height of moving knife 8 at the center part of moving knife 8 When dimension C is larger o Knife pressure is increased As a result motor stop will be caused o Setting taking out bobbin cannot be performed o Counte...

Page 46: ...t accidents caused by abrupt start of the sewing machine Standard adjustment 4 Thread trimmer cam timing Conditions Two marker dots on the handwheel aligns with marker line on the motor cover B 3 2 A 1 Most advanced position of moving knife 6 4 5 海外講習会用121122 LU 2810 7 EM ...

Page 47: ...read trimmer cam Caution Check that the edge of thread trimmer cam 4 comes in close contact with the edge of lower shaft set col lar 5 When thread trimming timing is retarded o Thread trimming action does not complete even at the needle up stop position As a result defective thread trimming will be caused When thread trimming timing is advanced o Defective thread trimming will be caused o Length o...

Page 48: ...ent accidents caused by abrupt start of the sewing machine Standard adjustment 5 Position of the thread trimmer cam 6 Adjusting the knife pressure o Knife pressure o Initial position 4 5 2 8 9 2 0 5 mm 2 3 0 1 0 05 mm 7 6 1 0 2 6 t o 7 m m 2 3 1 海外講習会用121122 LU 2810 7 EM ...

Page 49: ...amp pressure So adjust the knife pressure in the state that the clamp pres sure is not applied to the knife 3 Tighten setscrews 1 of the moving knife Caution Operate the sewing machine with the knife pressure minimized to such an extent that both needle and bobbin threads can be trimmed o Initial position 1 Loosen clamping screw 4 of the moving knife driving arm 2 Adjust so that the distance betwe...

Page 50: ...m or less Stitch length More than 7 mm and 9 mm or less Less than 3 mm 3 000 sti min 2 000 sti min 3 25 mm to less than 4 mm 2 400 sti min 2 000 sti min 4 25 mm to less than 5 mm 2 000 sti min 2 000 sti min 5 25 mm to less than 9 mm 1 800 sti min 1 800 sti min Scale of alternate vertical dial Switch upper Red and green lines Switch lower White and black lines 1 to 3 OFF OFF 3 25 to 4 OFF ON 4 25 t...

Page 51: ... the detection switch of the amount of alter nate vertical movement 3 to the alternate vertical dial 1 is 0 4 0 1 mm 4 Then tighten installing screws 2 of the detection switch of the amount of alternate vertical movement Caution When the position of the detection switch of the amount of alternate vertical movement 3 is changed check whether the relation between the alternate ver tical dial 1 and t...

Page 52: ...ure to wash the LOCKTITE applied part using a paint thinner or the like and reassemble it using LOCKTITE after removing any moisture from the mating faces If it is hard to remove a part which has been fixed using LOCKTITE heat it using a torch lamp or the like to help remove the part No Portion to which LOCKTITE is applied Part No LOCKTITE No 1 Set screw of coupling SM8050812TP LOCKTITE 243 No 1 S...

Page 53: ...mm Hook shaft selective washer B255728000D t 0 8 to 0 85 mm Hook shaft selective washer B255728000E t 0 975 to 1 025 mm o Consumable parts Part name Part No Remarks Model Needle M13517B1600 GROZ BECKERT 135 x 17 Nm 160 LU 2810 LU 2810 7 Hook asm 40131956 LU 2810 7 Hook asm 40126399 LU 2810 Bobbin 21334800 Aluminum bobbin with knurl Moving knife 21389200 LU 2810 7 Counter knife 21389309 LU 2810 7 C...

Page 54: ...omes When this alarming is heard a grease up action has to be taken Caution 1 Never feed oil to the grease up spots 2 It must be noted that too much grease application may result in grease leakage from the thread take up lever cover section or the needle bar 2 Greasing points 1 Needle bar rocking base 1 Remove face plate 2 Remove rubber plugs 1 3 Fill grease holes with JUKI Grease A 4 Attach rubbe...

Page 55: ...nate vertical change base and fix it with setscrews 1 of felt clamp 7 Attach two return springs 4 of alternate vertical change base 8 Attach top cover 4 1 2 3 3 Horizontal feed change base 1 Remove rear cover 2 Loosen setscrews 1 of felt clamp to remove felt clamp 2 3 Apply JUKI grease A to felt 3 4 Apply JUKI grease A to sliding surfaces of horizontal feed change base and feed conversion link 5 S...

Page 56: ...reasing point indication drawing Indicating the points where grease is applied at shipment 1 JUKI Grease A 2 Unirex N3 3 Barch L1002 1 2 1 MAIN SHAFT THREAD TAKE UP LEVER COMPONENTS 2 海外講習会用121122 LU 2810 7 EM ...

Page 57: ... 45 1 1 1 1 1 2 NEEDLE BAR COMPONENTS 海外講習会用121122 LU 2810 7 EM ...

Page 58: ... 46 1 1 3 HOOK OPENNER COMPONENTS 海外講習会用121122 LU 2810 7 EM ...

Page 59: ... 47 1 2 3 3 2 3 2 1 2 2 2 2 2 2 1 1 1 2 2 2 2 2 2 2 2 1 1 1 1 1 4 UPPER FEED COMPONENTS 2 2 2 1 海外講習会用121122 LU 2810 7 EM ...

Page 60: ... 48 1 2 1 1 2 2 1 1 1 1 1 5 HAND LIFTER AUTO LIFTER COMPONENTS 6 KNEE LIFTER COMPONENTS FOR LU 2810 1 1 1 1 1 1 海外講習会用121122 LU 2810 7 EM ...

Page 61: ... 49 1 2 2 2 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 7 LOWER FEED COMPONENTS 2 2 海外講習会用121122 LU 2810 7 EM ...

Page 62: ... 50 2 1 1 1 1 1 2 2 2 2 2 2 2 2 2 8 FEED ADJUST COMPONENTS 1 1 1 2 2 2 海外講習会用121122 LU 2810 7 EM ...

Page 63: ... 51 2 2 1 1 1 1 1 9 DL COMPONENTS FOR LU 2810 7 10 AUTO BT COMPONENTS FOR LU 2810 7 1 海外講習会用121122 LU 2810 7 EM ...

Page 64: ... 52 1 1 1 1 1 1 1 11 THREAD TRIMMING COMPONENTS FOR LU 2810 7 海外講習会用121122 LU 2810 7 EM ...

Page 65: ... 53 3 3 3 3 2 2 12 THREAD TENSION COMPONENTS 海外講習会用121122 LU 2810 7 EM ...

Page 66: ... 54 3 2 2 3 2 2 13 TENSION RELEASE COMPONENTS FOR LU 2810 7 海外講習会用121122 LU 2810 7 EM ...

Page 67: ... 55 3 3 3 3 14 BOBBIN WINDER COMPONENTS 海外講習会用121122 LU 2810 7 EM ...

Page 68: ...ker dots on the handwheel for the machine with thread trimmer only UP stop position One marker dot Adjustment of thread trimmer cam Two marker dots Adjustment of opener timing Three marker dots 海外講習会用121122 LU 2810 7 EM ...

Page 69: ... 57 7 Lubrication route diagram Oil tank Oil regulating valve Oil filter Pump To hook shaft gear To hook To oil pan Lubrication Circulation 海外講習会用121122 LU 2810 7 EM ...

Page 70: ...t name Remarks 1 6 operation switch 5V 2 6 operation switch 5V 3 12V 4 6 operation switch Alternate vertical movement switch 5 6 operation switch Automatic reverse feed stitching cancellation switch 6 6 operation switch Needle up down switch 7 6 operation switch 2 pitch changeover switch 8 6 operation switch Tension release upper side opening switch 9 6 operation switch 10 6 operation switch Fall ...

Page 71: ...r 16 17 18 19 20 21 22 23 24 25 26 2 Connectors that are connected in the head cover o CN100 14P connector Pin No Part name Remarks 1 Thread release solenoid lower side 2 Thread trimmer solenoid right side 3 Thread release solenoid upper side 4 Thread trimmer solenoid left side 5 Reverse feed switch GND 6 7 8 Thread release solenoid lower side 27V 9 Thread trimmer solenoid right side 27V 10 Thread...

Page 72: ...o high Adjust the needle thread tension 2 2 Needle comes in contact with the blade point of hook 2 A Check the clearance Refer to 2 6 Needle to hook timing 2 3 Clearance of inner hook guide is too large 3 A Check the clearance Decrease the clearance Refer to 2 5 Adjusting the inner hook guide 2 4 Amount of oil in the hook is insufficient 4 A Check the amount of oil in the hook Adjust the amount of...

Page 73: ... of of the thread take up spring and increase the stroke of the spring 3 3 Feed timing is not proper Refer to 2 8 Feed cam timing 3 4 Timing between the needle and the hook is excessively advanced or retarded 4 A Check the specified dimen sion Refer to 2 6 Needle to hook timing 3 5 Thread melts due to needle heat Decrease the sewing speed Use silicon oil Refer to below 3 6 Amount of oil in the hoo...

Page 74: ...needle bar is improper 4 A Check the lowest point of the needle bar Refer to 2 6 Needle to hook timing 4 5 Blade point of the hook is blunt 5 A Check the blade point of the hook Correct the blade point of the hook or replace the hook with a new one 4 6 Improper type of needle is used Replace the needle with one which is thicker than the current needle by one count 4 7 Hook needle guard is not unct...

Page 75: ...ion Replace the bobbin or the hook with new ones 5 4 Thread is not well tightened in the reverse feed 4 A Walking foot is not of top divided type Use the optional walking foot and presser foot 5 5 Height of the feed dog is too high 5 A Compare the height with the standard value Refer to 2 3 Height of the feed dog Lower the height by 0 2 mm than the standard value 5 6 Feed timing is excessively adv...

Page 76: ...n or the hook with new ones 7 4 Bobbin thread tension is too low Increase the tension of the bobbin thread 7 5 Bobbin has been wound too tight or too weak 5 A Check the state of bobbin winding Decrease or increase the tension applied to the bobbin winder 7 6 Direction of setting bobbin is reverse 6 A Check the setting Properly set the bobbin 8 Loose stitches at the time of corner stitching 8 1 Nee...

Page 77: ...ches on the moving knife and the hook Polish with buff or replace the part with a new one 1 F Presser foot drops from cloth at the time of thread trimming Perform thread trimming on cloth 1 2 Bobbin thread is not clamped 2 A Position of the clamp spring Refer to 2 17 1 Position of the counter knife and the clamp spring 2 B Pressure of the clamp spring is too low Refer to 2 17 1 Position of the cou...

Page 78: ...pressure and 2 17 1 2 and 3 Position of the moving knife and Position of the counter knife 1 B The blades of moving knife and counter knife have worn out or broken Replace the moving knife and counter knife with new ones 1 C Pressure of the counter knife is insuffi cient Refer to 2 17 4 Adjusting the knife pressure 1 D Presser foot drops from cloth at the time of thread trimming Perform thread tri...

Page 79: ...3 G Thread is not cut sharply Refer to causes Thread cannot be trimmed and Thread remains uncut after trimming 3 4 Needle thread is not caught 4 A Stitch skipping at the last stitch Refer to 2 6 Needle to hook timing 4 B Check the thread trimmer cam timing Refer to 2 17 6 Thread trimmer cam timing 4 C Top end of the moving knife is broken or has burrs Replace the moving knife with a new one 3 5 Bo...

Page 80: ... and counter knife have been improperly adjusted Refer to 2 17 4 Adjusting the knife pressure 6 B Counter knife pressure is excessively low Refer to 2 17 4 Adjusting the knife pressure 6 C Moving knife fails to work Refer to 2 17 5 Position of the thread trimmer cam and 2 17 6 Thread trimmer cam timing Replace the thread trimmer solenoid with a new one 6 D Presser foot drops from cloth at the time...

Page 81: ...p B Installing position of drawer stopper on the bottom surface C ø16 depth 25 D ø17 drilled hole E 3 ø13 drilled hole F 2 ø3 5 depth 10 G 2 ø3 5 depth 10 H 8 ø2 7 on the bottom surface depth 6 Drill a hole at the time of set up A B D C E F G H Y Y 2 locations V V 2 locations U U 2 locations W W 3 locations X X Z Z T T 海外講習会用121122 LU 2810 7 EM ...

Page 82: ...ion of drawer stopper on the bottom surface C ø16 depth 25 D ø17 drilled hole E 3 ø13 drilled hole F 2 ø3 5 depth 10 G 2 ø3 5 depth 10 H 8 ø2 7 on the bottom surface depth 6 Drill a hole at the time of set up I ø10 drilled hole J ø20 drilled hole Y Y 2 locations V V 2 locations U U 2 locations W W 3 locations X X Z Z T T 海外講習会用121122 LU 2810 7 EM ...

Page 83: ...海外講習会用121122 LU 2810 7 EM ...

Page 84: ...AN PHONE 81 42 357 2371 FAX 81 42 357 2380 http www juki com An environmental management system to promote and conduct the following 1 Eco friendly development of products and technologies 2 Green procurement and green purchasing 3 Energy conservation reduction in carbon dioxide emissions 4 Resource saving reduction of papers purchased etc 5 Reduction and recycling of waste in the activities of re...

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