Mitsubishi Electric LY2-3750-B1T Instruction Manual page 14

HOW TO USE
3 . Relationship between the fixed knife and the
movable knife (left) edge
( 1 ) The standard position is illustrated to the
right.
( 2 ) If the distance (0.3 mm) is too wide, such a
situation may allow for "triple" thread breakage
to occur, resulting in detached needle thread
after threads are cut. Also, if it is too narrow,
such a situation may lead to unexpectedly
uncut threads. Please keep this in mind.
( 3 ) The adjustment necessary in step ( 2 ) can
be done by correctly installing the fixed
knife bracket unit or correctly mounting
the fixed knife.
( 4 ) The fixed knife bracket unit has been
installed using screw Ⓐ with the bobbin
case holder position bracket removed (See
Fig. to the right).
4 . Knife driving shaft
( 1 ) The standard position is illustrated to the right.
( 2 ) When assembling, the knife driving shaft must
first be put through the knife driving crank.
( 3 ) The cam follower crank ( 1 ) must be
positioned as illustrated to the right, and
set to the flat on the knife driving shaft.
( 4 ) The stopper must be set to the flat on the
knife driving shaft in such a way that the
knife driving shaft is snug and smoothly
turns in the shaft direction.
5 . Installing the thread trimmer solenoid unit
( 1 ) Operation stroke of the thread trimmer
solenoid
①Standard operation stroke is 6 mm.
②This stroke can be adjusted by using nut Ⓐ.
( 2 ) Installing the unit
①The unit can be mounted by using screws
Ⓑ and Ⓒ.
②Clearance of 1 mm must be insured
between the driving lever and cam follower
crank ( 2 ) with stopper nut Ⓐ made contact
with the solenoid.
③In such a situation, activating the solenoid
should create a clearance of 0.5 mm
between cam follower crank ( 1 ) and ( 2 ).
This situation is standard. To meet this
standard, slide the solenoid mounting
bracket in the direction of the arrow as
illustrated, if adjustment is needed.
(Knife edge)
Fixed knife
Cam follower crank (1)
Coil spring
Bushing
87.5 mm
6 mm
Driving lever
Cam follower
crank (2)
1 mm
Cam follower crank (2)
Cam follower
crank (1)
0.5 mm
— 11 —
0.3 mm
Movable knife (left)
Screw Ⓐ
Fixed knife
bracket unit
Cam follower crank (2)
Stopper
Knife driving shaft
Ⓐ
Solenoid mounting
Ⓒ
bracket
Ⓑ