Brother International RH-9820 Instruction Manual - English - Page 106
Adjusting the upper movable knife, STANDARD ADJUSTMENTS, NOTE: Upper thread trimming timing
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9. STANDARD ADJUSTMENTS 9-24-2. Adjusting the upper movable knife The upper movable knife (1) is adjusted so that only the upper thread that is in front of looper L (2) is cut. If two of the upper thread loops (front and back) are cut, the upper thread trailing length will become too short and skipped stitches may occur at the sewing start. * If this adjustment is carried out in manual mode, the upper thread trimming operation can be checked step by step, which will make adjustment easier. (Seen from directly to the right) 1. Turn the upper shaft pulley to set the needle to the lowest position at the outside sewing position. 2. Loosen the screw (3), and then adjust the gap between the tip of the upper movable knife (1) and the needle to 0.1 - 0.4 mm. 3. Turn the upper shaft pulley to set the needle to its highest position (needle up stop position) at the outside sewing position. 4. Loose the screw (4), and then adjust the position of the upper movable knife (1) so that it is in between the throat plate (5) and spreader L (6) without touching either of them. 5. Move the upper movable knife (1) sideways by hand and check that it does not touch either the throat plate (5) or spreader L (6). 6. Once adjustment is complete, tighten the screws (4) and (3) in that order. 0403B NOTE: Upper thread trimming timing When the upper movable knife (1) has returned to its original position, the upper thread is trimmed at position A. When the upper movable knife (1) starts moving, the upper thread is trimmed at position B. 0565B 97 RH-9820