Brother DH4-B980 instruction manual Adjusting the trimming of the upper thread

9. STANDARD ADJUSTMENTS

9-15. Adjusting the trimming of the upper thread

The upper thread should be trimmed at the correct time after sewing is completed.

(1)

(2)

<-00, -01>

1.Adjust so that the upper thread trimmer knife (1) cuts

only one of the threads in front of the right looper (2). Note: If both strands of the thread loop are cut, the

thread remaining in the needle may become too short and skipped stitches may result.

0980Q

(3)

(4)

0981Q

<-02>

1.Adjust so that the upper thread trimmer knife (3) cut

only one of the threads in front of the right looper (4). Note: If both strands of the thread loop (forward and

back) are cut, the thread remaining in the needle may become too short and skipped stitches may result.

9-16. Adjusting the trimming of the lower thread and gimp

<-00, -01>

The lower thread and gimp should be trimmed at the correct time after the feed bracket has returned to the home position. Thread trimming operation can be checked in steps while manual mode is active. (Refer to “Using manual mode” on page 39.)

	(6)		(6)
			(7)
	(1)
(4)		(4)	(8)
(2)		(2)

(3)

(3)

(5)

(7)

0982Q 0983Q

1.The mechanism is adjusted so that the lower thread and gimp are separated from each other and spread by the loop spreader (1).

2.The lower thread is held between thread nipper M (2) and thread nipper D (3) on the plate spring. The gimp is held between thread nipper M (2) and thread nipper U (4) on the plate spring.

3.Adjust so that the edge of the fixed knife (6) and the index mark (8) on the movable knife (7) are aligned when the thread trimmer knife arm (5) is at the maximum stroke.

RH-9800

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