−
36
−
(9)
(10)
(11)
0.5
(5)
(4)
(6)
(1)
(2)
(3)
A
11.5 mm
1 mm
(7)
(8)
(9)
B
*
When the motor is separated from the coupling, set the
clearance between the end face of motor and the end face
of coupling to 0.5 mm when assembling them again.
2) Tilt the machine head, remove the setscrew and washer
(9) located on the rear side of the machine bed, and take
out connectingrod guide (10).
3) Pressing timing belt (11) in the right direction, turn the
timing belt to this side with fingers to remove it.
4) Replace the timing belt and assemble it in the reverse
order of the aforementioned procedure.
3-31 Points of adjusting and assembling of the bobbin winder
* Refer to the Instruction Manual for adjusting bobbin thread amount or uneven winding.
Perform the following adjustment when bobbin winder shaft (6) does not rotate.
1) Remove bobbin winder (asm.), and check whether the
rubber of bobbin winder friction wheel (7) has been
excessively worn out. If it has been excessively worn out,
replace bobbin winder friction wheel (23636301).
2) If the rubber has not been worn out so much, adjust the
position of the bobbin winder driving wheel in the following
procedure.
3) Fix the position of bobbin lever (3) of the bobbin winder
with setscrew (2) so that a clearance of approximately 1
mm is provided between bobbin winder adjust plate (2)
and lever (3). Lightly press the bobbin lever in the direction
of A at the position where the bobbin lever is released,
and remove the play. Then, tighten lever setscrew (4) so
that a clearance of approximately 11.5 mm is provided
between bobbin winder shaft (6) and adjusting plate (4).
4) Install the bobbin winder onto the machine arm.
At this time, take care not to tighten the setscrew more
strongly than necessary since the bobbin fitting base is
made of plastic.
5) Open the side plate.
6) Loosen setscrew (8) in bobbin winder driving wheel (9).
7) Pressing bobbin winder driving wheel (8) to bobbin winder
friction wheel (7) in the state that bobbin lever (3) is pressed
to bobbin winder shaft (6), fix it with setscrew (9).
8) Make bobbin lever (3) in the released state, and check
that bobbin winder shaft (6) does not rotate when turning
the handwheel. If it rotates, adjust again the pressing
pressure of bobbin winder driving wheel (8), and fix
setscrew (9) in bobbin winder driving wheel.
*
After the adjustment, actually wind bobbin thread round a
bobbin, and adjust the amount of bobbin thread with bobbin
winder adjust plate (1).
