JUKI LU-1520NCS-7 Page 21 Instruction Manual Download

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23. ADJUSTING THE KNIFE PRESSURE

24. ADJUSTING THE POSITION OF BOBBIN THREAD CLAMP

Loosen screw

❶

, and move the counter knife arm

❸

up and down by turning the eccentric screw

❷

adjust the knife pressure.

(Caution) Make the knife pressure as low as pos

sible to such an extent that both needle
and bobbin threads can be trimmed.

Loosen screw

❶

. Adjust the lateral position of clamp

arm

❹

so that a clearance of 0.05 to 0.2 mm is pro-

vided between the clamp spring

❷

and the moving

knife

❸

❷

❶

❸

❶

❹

❸

❷

❸

0.05 to 0.2 mm

WARNING :

To protect against possible personal injury due to abrupt start of the machine, be sure to start the

following work after turning the power off and ascertaining that the motor is at rest.

WARNING :

To protect against possible personal injury due to abrupt start of the machine, be sure to start the

following work after turning the power off and ascertaining that the motor is at rest.

Summary of Contents for LU-1520NCS-7

Page 1: ...LU 1520NCS 7 INSTRUCTION MANUAL ...

Page 2: ...KE UP SPRING 15 17 HAND LIFTER 15 18 ADJUSTING THE PRESSURE OF THE PRESSER FOOT 16 19 NEEDLE TO HOOK RELATION 16 20 ADJUSTING THE HOOK NEEDLE GUARD 17 21 ADJUSTING THE BOBBIN CASE OPENING LEVER 17 22 ADJUSTING THE POSITION OF COUNTER KNIFE AND MOVING KNIFE 18 23 ADJUSTING THE KNIFE PRESSURE 19 24 ADJUSTING THE POSITION OF BOBBIN THREAD CLAMP 19 25 ADJUSTING THE CLAMP PRESSURE 20 26 ADJUSTING THE L...

Page 3: ...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 speed As to the maximum sewing speed refer to 27 SEWING SPEED TABLE p 20 Operate the handwheel after the machine has totally stopped BEFORE OPERATION SPECIFICATIONS CAUTION Check the following so as to prevent maloperation of and damage to the machine Sewing speed Max 2 00...

Page 4: ...ch packing and washer to screw and fix them with nut 6 After they are fixed screw in waste oil container into drain plug 1 Carry the sewing machine with two persons Caution Do not hold the handwheel 2 Do not put protruding articles such as the screw driver and the like at the location where the sew ing machine is placed 3 Attaching the hinge seats and the support rub bers of the machine head Fix t...

Page 5: ...P stop position adjust it with screw and in case of adjusting the DOWN stop position adjust it with screw Refer to 32 ADJUSTING AND CHECKING THE STOP POSITION OF SEWING MACHINE p 22 for how to check and adjust the stop position after the completion of setup of the sewing machine WARNING To protect against possible personal injury due to abrupt start of the machine be sure to start the following wo...

Page 6: ...ot come in con tact with the belt and the handwheel Disconnection of the cords will result when they come in contact with one another B A 5 THE AIR DRIVE UNIT OF THE SEWING MACHINE EQUIPPED WITH AUTOMATIC REVERSE FEED DEVICE AND AUTO LIFTER 1 Attaching the air control unit 1 Attach regulator asm to the underside of the table with wood screws supplied with the regulator 2 Attach solenoid valve asm ...

Page 7: ...n ders can be caused resulting in material slippage or faulty thread trimming during automatic reverse feed stitching A F E D C B 3 Install the needle thread clamp device option by following the steps of procedure described below Start installation procedure after stopping the air supply to the regulator After the completion of installation procedure make sure that you have completed entire air pi...

Page 8: ...ews two pieces supplied with the unit 3 Insert air hose which you have detached in step 1 into joint of solenoid valve asm 4 Insert air hose which is connected to joint to joint of regulator asm 5 Install air hose for needle thread clamping along the piping of touch back switch and con nect to needle thread clamp device ...

Page 9: ...nsert two wires red and black wires of solenoid valve asm into the 18 pin connector of sole noid valve asm Insert the black wire into No 8 and red wire into No 17 10 18 1 9 Red wire Black wire Insertion position of 18 pin connector The above diagram represents the model without DL device For the DL device equipped model a cord is connected to No 3 and No 12 ...

Page 10: ...oving top cover Caution If oil is filled more than required oil leak age may result 3 Insert the projection located at the bottom of oil tank into the waste oil hole of the oil pan 4 Insert oil pipe into filter of the oil tank and fix the pipe with a clip 5 Pour the JUKI New Defrix Oil No 2 into the oil tank until HIGH level is reached 6 Add the same lubricating oil up to HIGH level as soon as the...

Page 11: ...ble 4 When replacing the oil in the oil tank remove stopper in the oil tank Then the oil can be drained from the installing port of the waste oil container in the oil pan After draining securely set stopper to the oil tank When taking out the oil tank take it out after draining the oil 5 Fix the filter case in which filter element and magnet are placed to cover upper with setscrews 6 Place cover l...

Page 12: ... oil in the hook Turning the screw clockwise will decrease the amount of oil in the hook or counterclockwise will increase it 2 The appropriate amount of oil when a sheet of paper is placed near the periphery of the hook is to such an extent that splashes of oil from the hook appear in approximately five seconds as shown in the figure on the left 10 Height of the screw of oil quantity distributor ...

Page 13: ...e a on inner hook toward the anti op erator s side 2 Make sure that the bobbin revolves in the di rection of the arrow when you draw the bobbin thread 11 INSTALLING THE BOBBIN WINDER THREAD GUIDE 1 Attach bobbin winder thread guide to the top cover using screws 2 Adjust the position of the thread guide referring to 12 WINDING A BOBBIN p 12 WARNING To protect against possible personal injury due to...

Page 14: ...d a bobbin about 80 of its capacity 4 If the bobbin is wound unevenly correct it by moving bobbin winder thread guide C back or forth Then tighten setscrews D 5 When the bobbin is filled up the bobbin winder lever automatically releases the bobbin and the bobbin winder stops running A B C D Caution Thread guide pin part of the shape as shown in the figure in the accessories is not used with this s...

Page 15: ...read through thread guide as illustrated in the figure on the left Caution When using thin needle thread when needle thread is passed through both of the thread tension disk No 2 necessary tension cannot be applied and the disks play do not pass the thread through and pass it in the order of to When using thin thread WARNING To protect against possible personal injury due to abrupt start of the ma...

Page 16: ...inning of sewing 9 1 6 2 0 The function is disabled 1 The function is enabled 2 The function is enabled when the reverse feed stitching at the beginning of sewing is disabled The function is disabled when the reverse feed stitching at the beginning of sewing is enabled Initial value Function setting No 197 The number of condensation stitches at the beginning of sewing 9 1 7 2 Setting range 0 to 19...

Page 17: ...djustment screw clockwise E to increase the bobbin thread tension or counter clockwise F to decrease it C A B D F E Decrease Increase 16 THREAD TAKE UP SPRING 1 When you want to change the stroke of the spring 1 Loosen screw in the stopper and move stop per to the right or left to change the stroke of thread take up spring 2 Move the stopper to the right to increase the stroke of the thread take u...

Page 18: ...e right or left until a clearance of 0 05 to 0 1 mm is provided between the blade point of the hook and the needle at the position where blade point of the hook is almost aligned with the center of needle After the adjustment tighten setscrews 5 Loosen two setscrews in the screw gear large and move the screw gear large to the right or left until blade point of the hook is aligned with the center o...

Page 19: ... B 1 Turn the handwheel in its normal rotational direc tion to bring bobbin case opening lever to its back end position 2 Turn the inner hook in the direction of the arrow until bobbin case stopper rests in the groove operator s side in throat plate 3 Loosen screw in the bobbin case opening lever and adjust so that a clearance of 0 7 0 1 mm is provided between the bobbin case open ing lever and pr...

Page 20: ...sen clamping screw of moving knife driv ing arm or carefully turn the hand wheel by hand to bring the needle bar upward until the needle tip is aligned with the top surface of feed dog 4 Loosen clamping screw of moving knife driving arm and adjust the initial position of moving knife so that a distance from the tip of moving knife to the end face a of throat plate mounting surface near side is 23 ...

Page 21: ...just the lateral position of clamp arm so that a clearance of 0 05 to 0 2 mm is pro vided between the clamp spring and the moving knife 0 05 to 0 2 mm WARNING To protect against possible personal injury due to abrupt start of the machine be sure to start the following work after turning the power off and ascertaining that the motor is at rest WARNING To protect against possible personal injury due...

Page 22: ...owing work after turning the power off and ascertaining that the motor is at rest Amount of alternate vertical movement of the walking foot and presser foot Stitch length 7 mm or less Less than 4 75 mm 2 000 sti min 4 75 mm to less than 6 5 mm 1 800 sti min 28 RESETTING THE SAFETY CLUTCH The safety clutch functions when an excessive load is applied to the hook or the other components during sewing...

Page 23: ...ING MACHINE p 22 2 Perform a trial sewing and confirm the finished state of sewing since the state at the start of sewing is different from that at the end of sewing in accordance with the sewn product material and thread 3 Be sure to perform the thread trimming motion on the cloth 1 Setting the functions of SC 922 control box For how to set the functions of SC 922 control box refer to the Instruc...

Page 24: ...ed point C and the center of the white engraved point C does not match loosen the screw on the U marker side of the handwheel and adjust the position within the long hole range 5 After adjustment tighten the screw 6 Repeat step 2 and 3 7 Set 0 for the SC 922 function setting No 10 Restore 8 Set 0 for the SC 922 function setting No 56 9 Step the pedal to idle the machine for a few stitches and then...

Page 25: ...ing Timing between the needle and the hook is excessively advanced or re tarded Pressure of the presser foot is too low The clearance provided between the top end of the needle eyelet and the blade point of hook is not correct Hook needle guard is not functional Improper type of needle is used Refer to 19 NEEDLE TO HOOK RELA TION p 16 Tighten the presser spring regulator Refer to 19 NEEDLE TO HOOK...

Page 26: ...he current ones Increase the bobbin thread tension 8 Thread remains uncut after thread trimming Bobbin thread trimming failure when stitch length is comparatively short Initial position of the moving knife has been improperly adjusted Bobbin thread tension is too low Refer to the Engineer s Manual Increase the bobbin thread tension 9 Thread breaks at the start of sewing after thread trim ming The ...

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