JUKI LH-4128-7, Руководство инженера

Страница: 85 / 89

– 81 –
10. The wiper comes in contact with the 10-1) The wiper is improperly positioned. Adjust so that the wiper spreads the thread properly.
needle.
10-2) The needle-up stop position of 2-A) Position of the red marker dot Properly adjust the needle-up stop position of the sewing
the machine is improper. engraved on the handwheel and machine.
the marker dot engraved on the
machine arm when the sewing
machine stops with its needle up.
11. The wiper fails to spread the thread. 11-1) The wiper improperly positioned. Adjust so that the wiper spreads the thread properly.
11-2) Length of the needle thread 2-A) Tension of the tension controller Adjust the tension controller No.1 so that the needle
remaining after thread trimming No.1. thread of 35 to 45mm remains after thread trimming.
is excessive.
2-B) Timing of the thread trimming action. Properly adjust the thread trimming timing.
2-C) Position of the moving knife. Adjust the longitudinal position of the moving knife.
11-3) The bobbin thread clamping 3-A) Thread presser spring. Properly adjust the position of the thread presser.
pressure is too high.
11-4) The moving knife fails to cut the Replace the moving knife with a new one.
thread sharp.
Trouble Case (1) Case (2) Check and Corrective measures