24
3) Adjusting the Lower Shaft Gear and the Rocking Shaft Gear
A. Unfasten screws ① and ②.
B. While having the upper shaft turning, move the rocking shaft gear in the direction of the arrow to
the position where it will move easily without load.
C. Have the oscillator shaft collar(right) stick to the bed surface , and then tighten the collar screw
②.
D. Turn the oscillator shaft collar(right), still sticking to the bed surface , in the direction of the
arrow and make adjustments so the end of the shuttle drive will rotate smoothly with the
backlash of under 0.1mm.
E. Tighten screw ① back on firmly.
[Fig. 31]
4) Adjusting the Spring on the Upper Side of the Shuttle
After removing the lower feed plate and the needle plate from the machine, unfasten the screw of the
spring on the upper side. Then, adjust the spring on the upper side of the shuttle so that the backside of
the needle and comes to point in the vertical direction, and the center of the needle will come to the
middle of interval horizontally. After the adjustment is done, tighten the screw back on firmly.
[ Caution ]
The machine may not operate when the rocking shaft gear in not in the right position.
[ Caution ]
If there is too much backlash the machine may make more noise than usual during operation. And if
there is not enough backlash, the machine may not operate.
[Fig. 32]
[ Caution ]
The thread may be disconnected or the thread strand may be unfastened if there are scratches or if the surface
is rough around the spring groove on the upper side of the shuttle. Always check the surface of the spring
before operating the machine.
①
①
①
①
Backlash : 0.1mm and below
②
Oscillator Shaft
Collar(R)
①
①
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