Adjusting The Bobbin Thread Heat Cutter Unit Position - JUKI LK-1942ZA5050 Instruction Manual And Parts List

Standard adjustment
❺
❻
❸
❼ ❻
Center line

3. Adjusting the bobbin thread heat cutter unit position

Standard adjustment
0 mm
❸
❷
Throat plate
❶
Adjustment procedures
2. Remove heat wire mounting screw ❺ .
Replace upper heat wire ❻ with a new
one and attach the latter with hot-wire
mounting screw ❺ .
Attach the hot wire while arranging so
that the center of needle thread heat
cutter unit ❸ and the center of upper
heat wire ❻ are aligned.
Be aware that faulty thread trimming
can occur if the heat wire is not properly
arranged.
3. Attach needle thread heat cutter unit ❸
Needle
on arm ❶ . If the center of upper heat
wire ❻ is not aligned with the needle,
loosen terminal block mounting screw
❼ and align the center of upper hot wire
with the needle.
Adjustment procedures
1. Turn the power OFF.
2. Discharge air.
3. Remove the needle hole guide.
4. Extrude the bobbin thread heat cutter
unit ❶ as far as it goes. Adjust screw
❸ so that the top end of heat wire is
aligned with and in parallel to the front
edge line of the block ❷ .
5. Turn ON the air supply.
6. Turn ON the power to the sewing ma-
chine.
7. Adjust the sensor position so that the
standby side sensor of the cylinder is
turned ON when the heat cutter rests at
its standby position.
8. Adjust the sensor position so that the
extruded side sensor is turned ON
when the hot wire is extruded the most.
– 13 –
Results of improper adjustment
Results of improper adjustment
Faulty bobbin thread trimming
can occur.