D
Adjustment of the feed timing
1 . The standard position of the eccentric feed
cam and eccentric feed lifting cam are
illustrated to the right.
2 . To adjust the position, first open the top
cover. Properly slide the eccentric cam.
3 . The eccentric feed cam can also be adjusted
by removing the rubber plug located on the
top cover, and the upper eccentric feed lifting
cam can also be adjusted by removing the
rubber plug located on the arm.
In the latter case, however, the built-in bevel
gear is concealed; care should be taken when
adjusting.
E
Adjustment of the thread trimmer device
1 . Configuration of the thread trimmer devise
2 . Precautions for adjustment
The LY2-3750 uses a thread trimmer drive system with a lower shaft cam. So if you turn the
machine by one revolution with the thread trimmer solenoid activated (i.e., with the roller located
on the cam follower crank ( 2 ) kept engaged with the thread trimmer cam), the movable knife (left)
will make contact with the needle, breaking the contacting parts.
Activate the built-in solenoid only when the normal thread trimming cycle is active (lower position
→ upper position).
HOW TO USE
Bevel gear
for upper shaft
1st screw
1st screw
Rubber plug
Rubber plug
Top cover
Upper shaft
2nd screw
Upper eccentric feed
lifting cam
Eccentric
feed cam
Fixed knife bracket unit
Thread guide
Fixed knife
Movable knife (left)
Knife driving crank
Knife driving shaft
Cam follower
crank (1)
Cam follower
crank (2)
Drive lever Stopper plate
Stopper
Spring
Spring
Coil spring
Collar
Thread trimmer cam
Flexible wire
Knife base unit
Thread trimmer solenoid unit
Thread trimmer solenoid
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