Adjusting The Zigzag Width (Stitch Width) - Brother RH-9820 Instruction Manual

Looper height
Adjust so that the positions of the eye looper (8) and the looper R (9) are as follows.
The clearance <a> between the eye looper (8) and the spreader L (1) should be equal to the thickness of the lower thread
(looper thread).
The clearance between the looper R (9) and the spreader R (2) should be as small as possible (so that the two parts do not
touch).
<Adjustment method>
1. Loosen the set screws (10), and then move the eye looper (8) or the looper R (9) up or down to adjust.
2. Check that the spreader L (1) and the spreader R (2) move smoothly by the force of the springs (3).
3. Once adjustment is complete, securely tighten the set screws (10).

9-2. Adjusting the zigzag width (stitch width)

The zigzag width can be adjusted to between 1.5 - 4 mm. It is set to 3 mm at the time of shipment from the factory.
* If the zigzag width is set to 3.2 mm or more, replace the throat plate (optional part).
NOTE:
If the throat plate has been replaced, carry out the following readjustments.
"9-20. Adjusting the positions of the work clamp plates", "9-21. Adjusting the cloth opening amounts".
1652B
1653B
1. Turn the cover (1) to open it.
2. Use the accessory socket wrench to loosen the zigzag
width adjustment nut (2).
3. Move the adjustment screw (3) up or down along the slot
to adjust.
* The zigzag width becomes smaller as the adjustment
screw (3) is moved upward.
* The zigzag width becomes larger as the adjustment
screw (3) is moved downward.
* There are index marks at the 2 mm and 3 mm zigzag
width positions. Align the middle of the adjustment
screw (3) with the index marks.
4. Once adjustment is complete, securely tighten the
adjustment nut (2), and then close the cover (1).
NOTE:
If the zigzag width has been increased, carry out the
following readjustments.
"9-4. Adjusting the needle and looper timing", "9-5.
Adjusting the looper stroke", "9-6. Adjusting the height of
the needle bar", 9-7. Adjusting the clearance between the
loopers and needle", "9-8. Adjusting the needle guard",
"9-9. Adjusting the spreader installation positions", "9-10.
Adjusting the spreader timing".
The index marks are a guide to the zigzag width. Lower
the needle onto a piece of paper or similar to accurately
measure the zigzag width.
RH-9820
9. STANDARD ADJUSTMENTS
0483B
72