JUKI LBH-1700, Engineer'S Manual

Page: 93 / 126

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89
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Trouble
Cause (1)
Cause (2)
Checking order and adjusting procedure
Page
(2) Woth regard to mechanical components 1.
Height of needle is improper when the sewing machine has stopped.
2.
Cloth cutting knife fails to drop.
3. Colth cutting knife fails to cut. 4. Cloth cutting knife fails to return.
1-1)
Main shaft stop position is improper.
3-1)
Stroke of the cloth cutting knife is improper.
3-2)
Sharpness of the cloth cutting knife is dull.
4-1)
Skew in the cloth cutting knife drive section
4-2)
The cloth cutting knife bites in cloth and does not return.
1)-A
Position of origin sensor is improper.
Cord of knife driving solenoid is disconnected. (A, B types) Air pressure is too low, or air leaks. (C type) 1)-A
Installing position of knife driving solenoid is improper.
1)-B
Installing position of the cloth cutting knife is improper.
2)-A
Blade of the knife is broken.
2)-B
A knife other than the genuine
one is used.
1)-A
Adjusting the play of knife bar
is improper.
1)-B
Cloth cutting knife interferes with needle bar.
1)-C
Skew due to cutting waste or dust in drive section
2)-A
Sharpness of the knife is dull.
2)-B
Setting of knife groove width is excessively large for the floppy materials.
2)-C
Installing position of knife driving solenoid is improper.
Refer to the item (1) of adjusting procedure of the origin sensor. (Adjusting procedutre of the upper detecting plate) Connect the cord. Set the air pressure to 0.5MPa. Refer to the item (11) of STANDARD ADJUSTMENT. Slightly lower the height of cloth cutting knife. Replace the knife with a new one. Replace the knife with a genuine one. Adjust the play with the knife bar presser. Refer to the item (11) of STANDARD ADJUSTMENT. Clean often the drive section. Replace the knife with a new one. Replace the presser or make the setting of knife groove width as small as possible. Refer to the item (11) of STANDARD ADJUSTMENT.
(See page 46.)
(See pages 12 to 13.) (See pages 12 to 13.) (See pages 12 to 13.)