Troubles And Corrective Measures; Machine Head Components - JUKI MOL-254 Engineer's Manual

13. TROUBLES AND CORRECTIVE MEASURES

[1] Machine head components

Trouble
1. Machine lock
2. Noise occurs from the face plate section.
3. Wiper fails to sweep thread.
Cause (1)
Defective return of the thread trimming link
Position of the thread trimmer cam is wrong.
Position of the thread trimmer solenoid arm
is wrong.
Position of the thread trimming link stopper
screw is wrong.
Moving knife moves slow (far side).
Initial position of the moving knife is wrong.
Longitudinal position of the oscillator is
wrong.
Clearance provided between the inner hook
and the shuttle driver is large.
Wiper interferes with the needle.
Wiper operating time is short.
Defective operation of the wiper cylinder
Defective operation of the wiper cylinder
solenoid valve
Cause (2)
Interference of the cam follower stopper with
the cam follower
Interference of the thread release arm with
thread release link
Marker line on the thread trimmer cam is not
adjusted to the marker line on the main shaft.
Thread trimmer solenoid arm comes in
contact with the thread trimming link.
(Longitudinal direction)
Cam follower comes in contact with the cam
follower stopper and fails to rotate. (Rotating
direction)
Thread trimmer roller is not properly entered
in the groove of the thread trimmer cam.
Installing position of the wiper is wrong.
Checking order and adjusting procedure
Adjust the clearance provided between the cam follower stopper
and the cam follower.
Adjust the position of the thread release stopper.
Adjust the thread trimmer cam.
Adjust the position of the thread trimmer solenoid arm. (Longitudinal
direction)
Adjust the position of the thread trimmer solenoid arm. (Rotating
direction)
Adjust the position of the thread trimming link stopper screw.
Adjust the knife pressure of the moving knife.
Adjust the initial position of the moving knife.
Adjust the position of the oscillator.
Adjust the clearance provided between the inner hook and the shuttle
driver.
Adjust the installing position of the wiper.
Lengthen the operating time.
Replace the cylinder.
The solenoid valve is defective.