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9. STANDARD ADJUSTMENTS
RH-981A
58
9-4. Adjusting the height of the needle bar
The standard height for the needle bar is 2.5 mm. (The needle bar height may need changing depending on the
material and thread being used.)
1. Align the tip of the eye looper (1) with the center of the needle (2) when the needle (2) is at the inside sewing
position.
2. Remove the face plate.
3. Loosen the screw (3) of the needle bar clamp (5) and adjust the height of the needle bar (4).
* After aligning the tip of the eye looper (1) with the top edge of the needle hole, lower the needle bar (4) 2.5 mm.
4. Adjust so that there is as little play as possible, and so that the needle bar clamp (5) and the needle bar level feed
link (6) can maintain their oil films. This will help to ensure that the needle bar turns smoothly.
9-5. Adjusting the clearance between the looper and needle
Be sure to carry out this adjustment after changing the size of the needle.
The clearance between the tip of the looper and the needle should be 0.05 - 0.2 mm.
Loosen the looper screw (1) and then adjust the clearance.
* This clearance must be uniform while the looper base is rotating (through 360
o
).
If the clearance is not uniform, adjust the turning center for the needle bar. (This adjustment is made at the time of
shipment from the factory.)
* After making the adjustment in step 1. above, carry out the adjustment procedure given in "9-7. Adjusting the
spreader mounting positions".
3082Q 3083Q
0961Q
2.5 mm
2.5 mm
3084Q 0963Q
0.05 - 0.2mm