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JUKI LU-2220N-7, Instruction Manual

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JUKI LU-2220N-7 Instruction Manual Download Page 3

25. ADJUSTING THE THREAD TRIMMING MECHANISM COMPONENTS ................................16

(1) Positioning the thread trimming cylinder joint  ..............................................................................16
(2) Moving knife (Adjusting the vertical position) ................................................................................17
(3) Counter knife (Adjusting the vertical position) ...............................................................................18
(4) Thread guide installing position .......................................................................................................18
(5)-1. Counter knife (Adjusting the travel amount) (Positioning of the counter knife base stopper) ........... 19
(5)-2. Counter knife (Adjusting the lateral position) .............................................................................20
(6) Adjusting the knife pressure ............................................................................................................21
(7)-1. Initial position of the moving knife drive arm and the moving knife ........................................22
(7)-2. Mounting position of the moving knife returning plate .............................................................23
(7)-3. Adjusting the clearance between the moving knife drive arm and the moving knife drive arm 

stopper ..............................................................................................................................................23

(8) Adjusting the thread trimming cam timing ......................................................................................24
(9) Installing position of the clamp spring ............................................................................................25
(10) Adjusting the condensation amount ..............................................................................................26
(11) Explanation of the solenoid valve ..................................................................................................27

26. ADJUSTING THE LIFTING AMOUNT OF THE PRESSER FOOT AND THE WALKING 

FOOT ................................................................................................................................... 28

27. SEWING SPEED TABLE ..................................................................................................... 28

(1) Max. sewing speed in accordance with the amount of the alternating vertical movement of the 

walking foot and the presser foot ...................................................................................................28

28. RESETTING THE SAFETY CLUTCH .................................................................................. 28
29. OPERATION SWITCHES .................................................................................................... 29
30. KNEE SWITCH .................................................................................................................... 31
31. CAUTIONS WITH REGARD TO THE SEWING OPERATION ............................................ 31
32. TROUBLES IN SEWING AND CORRECTIVE MEASURES ............................................... 32

Summary of Contents for LU-2220N-7

Page 1: ...ENGLISH LU 2220N 7 INSTRUCTION MANUAL ...

Page 2: ... thread guide rod 10 2 Installing the bobbin winder thread guide 10 14 WINDING A BOBBIN 11 15 ADJUSTING THE AMOUNT OF OIL IN THE HOOK 11 16 THREADING THE MACHINE HEAD 12 17 ADJUSTING THE STITCH LENGTH 13 18 THREAD TENSION 13 1 Adjusting the length of thread remaining after thread trimming 13 2 Adjusting the needle thread tension 13 3 Adjusting the bobbin thread tension 13 19 THREAD TAKE UP SPRING ...

Page 3: ...ion of the moving knife returning plate 23 7 3 Adjusting the clearance between the moving knife drive arm and the moving knife drive arm stopper 23 8 Adjusting the thread trimming cam timing 24 9 Installing position of the clamp spring 25 10 Adjusting the condensation amount 26 11 Explanation of the solenoid valve 27 26 ADJUSTING THE LIFTING AMOUNT OF THE PRESSER FOOT AND THE WALKING FOOT 28 27 SE...

Page 4: ... power level LWA A weighted value of 91 0 dB Includes KWA 2 5 dB according to ISO 10821 C 6 2 ISO 3744 GR2 at 3 500 sti min 2 INSTALLATION Spacer rubber 1 When carrying the sewing machine be sure to carry by two people 2 Do not place a protruding object such as a screw driver at a place where the sewing machine is to be installed 3 Fix the hinge seats and the support rubbers sup plied with the mac...

Page 5: ...corners 8 Install head support bar 1 firmly on the table by inserting it into the table hole until it will go any further 3 ADJUSTING THE BELT TENSION Adjust the belt tension with the height of the motor so that the belt sags 15 mm when the center of V belt is applied with a 9 8N load WARNING Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewin...

Page 6: ...stops Then tilt the machine head After attaching the belt cover confirm whether or not the respective cords do not come in contact with the belt and the handwheel Disconnection of the cords will result when they come in contact with one another 5 ATTACHING THE BELT COVER 4 A 4 1 3 5 B 2 Notch upper Notch lower 10 mm 2 5 mm 7 6 1 2 4 INSTALLING THE SYNCHRONIZER SUPPORT ROD 1 Attach synchronizer sup...

Page 7: ... to prevent accidents caused by abrupt start of the sewing machine 3 Install regulator asm 1 and air control unit asm 3 in the broken line frame as shown in the illustration on the left side Determine the installing position where it is convenient to the user Rear view of table 6 INSTALLING THE KNEE SWITCH 1 Attach supporting base 2 of knee switch 1 onto the underside of the table using wooden scr...

Page 8: ...ing from the air control unit to the air cylinders of the sewing machine as shown in the illustration Adjust the seal Nos pasted on the hoses to those pasted on the joints and connect as described in the list Be sure to pass the hoses through hole 0 in the table After connecting them bundle air hoses 1 2 5 B and C 6 stage switch cord 6 using cable clip 1 of the machine head Directly pass air hoses...

Page 9: ...ess the knob down into the home position 1 Decrease Increase B C 5 7 3 1 Solenoid valve Cylinder Condensation 1 1 BT 2 2 Thread trimming 3 3 Thread trimming 4 4 Thread clamp 5 5 FL 7 7 FL 8 8 DL 9 9 2P B B 2P C C 8 9 4 2 3 Pass air hoses 5 through cord cover 2 the same as 6 range switch cord 6 pass them through clearance A between 6 range switch 3 and the machine arm and connect them to the joint ...

Page 10: ...an extended period of disuse apply two or three drops of oil to the sections indicated with arrows Refer to Fig 1 on the next page 3 When you start the use of the sewing machine which has not been used for an extended period of time be sure to break in the sewing machine at 1 800 sti min for approximately 10 minutes In the case where the machine is operated with the hook filled with normal amount ...

Page 11: ...Approximately once a month remove screws 6 from the filter case and clean magnet 7 and filter element 8 inside the filter 2 If the filter is clogged with soil circulation failure will result This will give rise to oil leakage from the upper portion of the hook driving shaft saddle ...

Page 12: ...roke 2 Loosen needle clamp screw 2 and hold needle 1 so that the long groove in the needle is facing exactly to the left 3 Push the needle 1 deep into the needle clamp hole until it will go no further 4 Tighten needle clamp screw 2 firmly Long groove WARNING Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine WARNING Turn OFF the powe...

Page 13: ...sition of the thread guide referring to 14 WINDING A BOBBIN 1 2 12 THREADING THE HOOK 1 2 1 Pass the thread through thread path 1 in the hook and thread hole 2 in the lever and draw the thread Now the thread will be brought to the thread hole 2 via the tension spring Make sure that the bobbin revolves in the direction of the arrow when you draw the thread WARNING Turn OFF the power before starting...

Page 14: ...it several turns round the bobbin 2 Tilt bobbin presser 1 3 Adjust bobbin thread amount adjustment screw 2 to wind a bobbin about 90 of its capacity Turn the screw counterclockwise to increase the amount of thread to be wound round the bobbin or clockwise to decrease it 4 If the bobbin is wound unevenly correct it by moving thread guide 3 of the bobbin winder back or forth Then tighten screws 4 5 ...

Page 15: ...A through to P as shown in the illustration given above WARNING Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine I L K J M N O A F D B C E G H P Threading method draw the thread to the operator s side Needle thread N ...

Page 16: ...rmed as long as you keep pressing the lever down 3 Release the lever and the machine will run in the normal feed direction 17 ADJUSTING THE STITCH LENGTH 3 1 2 18 THREAD TENSION 1 Adjusting the length of thread remaining after thread trimming Turn thread tension nut No 1 1 clockwise A to shorten the length of thread remaining after thread trimming Turn the nut counterclockwise B to lengthen it 2 A...

Page 17: ...rease it 1 When you want to keep the presser foot in the lifted position turn hand lifter 1 in the direction of the arrow This makes the presser foot rise 9 mm and stay at that position 2 To make the presser foot come down to its home position lower the hand lifter 1 Increase Decrease 21 ADJUSTING THE PRESSURE OF THE PRESSER FOOT 1 Turn presser spring regulating dial 1 clockwise to increase the pr...

Page 18: ...Set the standard feed adjusting dial to maximum value and check that the blade point of the hook does not come in contact with the needle The operation panel could come in contact with the thread stand when tilting the machine head To protect the relevant parts from contact shift the thread stand to a position at which the thread stand does not interfere with the control panel 23 ADJUSTING THE HOO...

Page 19: ...end E of bobbin case opening lever and protrusion F on the bobbin case when they approach most Then tighten screws 2 and 3 F 6 C 5 A B D 3 E 4 0 1 0 3 mm 1 E 2 1 Positioning the thread trimming cylinder joint Assemble thread trimming cylinder 1 and thread trimming cylinder joint 2 as illustrated in the sketch at left and secure with nut 3 25 ADJUSTING THE THREAD TRIMMING MECHANISM COMPONENTS WARNI...

Page 20: ...clamping screw 1 perform the items 6 7 8 and 9 that are mentioned later 3 0 5 to 0 6 mm Throat plate Gauge for adjustment supplied as accessories 37 8 mm 26 8 mm 29 mm Thickness 0 6 mm 43 mm 2 The vertical position of moving knife is the position where the clearance between the bottom surface of throat plate reverse side and the top surface of moving knife 3 is 0 5 to 0 6 mm At the time of adjustm...

Page 21: ...near L engraved marker line 1 2 3 4 Thread guide installing position 1 Loosen thread guide setscrews 1 and tighten them again after adjusting the position of thread guide 2 Installing position The top surface of thread guide 2 should align with the top surface of moving knife 3 in the vertical direction and the thread guide should be fixed after fully moving it to the direction of the arrow mark a...

Page 22: ... this time you may use the adjusting gauge supplied with the unit 3 Tighten counter knife base stopper setscrews 1 4 In the state as described in Step 2 adjust the clearance provided between thread trimming cylinder joint 6 and cylinder mounting plate 7 to 19 0 0 5 mm Tighten counter knife driving arm clamping screw 2 At this time remove the longitudinal play by moving counter knife base 4 downwar...

Page 23: ... comes in contact with the counter knife base stopper Distance between the tip of counter knife and the machine bed is 37 8 0 1 mm The clearance provided between the cylinder joint and the cylinder mounting plate is 19 0 0 5 mm The top end of the counter knife is aligned with the needle tip center of the needle 2 When installing counter knife 2 tighten the setscrew with the counter knife pressed a...

Page 24: ...fe pressure 4 Release the solenoid valve which has been manually actuated in Step 1 Refer to 11 Explanation of the solenoid valve 1 When the knife pressure is low tighten moving knife setscrews 1 while lightly pressing the moving knife to the counter knife When the knife pressure is high worn out or damage of the blade section will be caused So adjust the knife pressure as low as possible 2 When t...

Page 25: ...thread trimming cam to 0 05 to 0 15 mm and adjust moving knife 8 to the initial position The initial position of moving knife is the position where the distance between the top end of moving knife and the machine bed is 26 8 0 1 mm At this time the gauge for adjustment supplied as accessories can be used 7 Keeping the state of 6 tighten moving knife drive arm clamping screw 7 Tightening torque 5 9...

Page 26: ...nife returning pin 2 adjust so that a clearance of 0 05 to 0 1 mm is provided between moving knife driving arm stopper screw 3 and moving knife driving arm 4 and secure the moving knife driving arm stopper screw with nut 5 2 Align the top end of leaf spring with the center of the moving knife returning plate and secure the leaf spring with leaf spring asm setscrews 6 3 Release the manual switch of...

Page 27: ...he position where thread trimming cam roller 3 comes in contact with R section where it starts entering the cam groove when the position of handwheel is at L engraved marker line Confirmation Make sure again of the position of L engraved marker line and R section where the roller starts entering the cam groove after fixing the thread trimming cam 1 2 3 Close contact Pointer on handwheel Scale on h...

Page 28: ...en the clamp spring and the hook and 2 Contact between the clamp spring and the moving knife at its front end position Contact between those parts can cause a breakage of the clamp spring When the position of the clamp spring cannot be adjusted even clamp spring setscrews 1 are loosened loosen clamp spring base setscrews 3 and move clamp spring base 4 to the operator s side to adjust The position ...

Page 29: ...m that the condensation amount pitch before one stitch of thread trimming is proper in accordance with the sewing conditions The length of thread remaining on the cloth side is shortened by decreasing the condensation amount When the amount is excessively decreased however the cloth is tore by the seams and the stitch skips As a result thread trimming trouble occurs In addition when the amount is ...

Page 30: ...n be actuated by hand 2 By turning the switch in the direction of the arrow mark while pressing it it is possible to lock By turning the switch in the reverse direction of the arrow mark it is possible to release the lock When turning ON the power confirm that all covers of the solenoid valve are closed Under the state that the manual switch is locked the covers are not closed and it is possible t...

Page 31: ...esser foot and the walking foot is adjusted using dial 1 Turn the dial clockwise to increase the lifting amount or counterclockwise to decrease it Amount of alternate vertical movement of walking foot and presser foot Revolutions per minute 1 to 6 5 mm 2000 sti min 28 RESETTING THE SAFETY CLUTCH The safety clutch functions when an excessive load is applied to the hook or the other components durin...

Page 32: ... heavy weight materials 3 Automatic reverse feed stitching cancellation addition switch If this switch is pressed when the following automatic reverse feed stitching has been specified the reverse stitching will not take place for once immediately after it is pressed Example 1 If this switch is pressed when no automatic reverse feed stitching has been specified the reverse feed stitching will take...

Page 33: ...f this switch is pressed the stitch length is changed over to that of the scale on the feed adjusting dial Lamp in the button is lit up Be sure to make the number of 2P feed adjusting dial less than that of the standard feed adjusting dial Example Standard feed adjusting dial scale 9 2P feed adjusting dial scale 6 If this switch is pressed stitch length is changed over from 9 to 6 OFF ON If this s...

Page 34: ...after turn ing ON the power In addition when the presser foot is lifted after thread trimming motion the needle thread is clamped with the needle thread clamp device but when the needle thread clamp switch is turned OFF the needle thread is released Needle thread clamp switch can be set to effective or ineffective by setting of the motor For the details refer to the Instruction Manual Supplement O...

Page 35: ... skipping 1 Timing between the needle and the hook is excessively advanced or retarded 2 Pressure of the presser foot is too low 3 The clearance provided between the top end of the needle eyelet and the blade point of hook is not correct 4 Hook needle guard is not functional 5 Improper type of needle is used Refer to 22 NEEDLE TO HOOK RELATION Tighten the presser spring regulator Refer to 22 NEEDL...

Page 36: ...justing the initial position of the knife in the Engineer s Manual Increase the bobbin thread tension Refer to 25 4 Thread guide installing position When using thick thread equivalent to 4 or 5 delay the UP stop position Refer to Function No 112 of the Instruction Manual for SC 510 Refer to Function No 143 of the Instruction Manual for SC 922 8 Thread breaks at the start of sewing after thread tri...

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