Brother RH-9820 Service Manual download pdf (Page 151)

7. ADJUSTMENTS

RH-9820

142

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).

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).

7-2. 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).

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.

“7-4. Adjusting the needle and looper timing”, “7-5. Adjusting the looper stroke”, “7-6. Adjusting the height of the needle bar”,

“7-7. Adjusting the clearance between the loopers and needle”, “7-8. Adjusting the needle guard”, “7-9. Adjusting the

spreader installation positions”, “7-10. 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.

0483B

1.5mm - 4mm

0967Q

0474B

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Brother RH-9820 Service Manual Page 151