Mitsubishi Electric LY2-3750-B1T Instruction Manual page 15

HOW TO USE
6 . Installing the thread trimmer cam
( 1 ) Face the 2nd timing mark Ⓐ (Green)
located on the pulley to the matching mark
on the arm.
( 2 ) With the thread trimmer solenoid activated,
turn the thread trimmer cam forward until
the cam makes contact with the roller.
Then, set the cam.
( 3 ) With the thread trimmer solenoid
deactivated, allow the cam follower crank
( 2 ) to return to its original position. This
should create a clearance of 0.5 to 1.0 mm
between the cam and roller end. This
distance is standard.
Note: The standard position of cam follower
crank (2) before activation is illustrated
to the right. If this position has been
changed due to removal of stopper
plate, etc., first perform the specified
adjustment by using the adjusting bolt
located on the stopper plate before
adjusting as above steps (1) to (3).
7 . Adjustment of knives engagement
( 1 ) Position of movable knife (left) and fixed knife
①See the illustration. The standard distances
from the needle center are 7.5 mm and
5 mm from the movable knife (left) and
fixed knife respectively.
( 2 ) Adjustment of knives engaging amount
①With the solenoid activated, turn on the
machine. This turns the thread trimmer
cam which turns the movable knife (left).
When the movable knife (left) has moved to
its farthest distance, the standard engaging
amount of knives is 1.5 to 2.0 mm.
②The engaging amount can be adjusted by
properly mounting the driving crank.
( 3 ) Adjustment of knives engaging pressure
①See the illustration. In such a situation,
the movable knife (left) and the fixed knife
should first make contact with each other.
This situation is standard.
②If a thread is poorly cut, particularly when
it is thick, slightly increase the engaging
pressure. This should solve the problem.
③The engaging pressure can be adjusted in
this way: Loosen lock nut Ⓑ (See Fig.), and
adjust it by using adjusting screw Ⓐ.
Thread trimmer cam
1mm
Cam follower crank (2)
Movable knife (left)
Knife driving crank
Movable knife (left)
Movable knife (left)
— 12 —
Matching mark Ⓐ
Thread trimmer cam
Roller
0.6 mm
Lower
shaft
Roller
Knife driving shaft
Fixed knife
Ⓑ Ⓐ
7.5 mm 5 mm
1.5 to 2.0 mm
Fixed knife
3 mm
Fixed knife
0.5 to 1.0 mm