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Adjusting The Cutter Installation Height - Brother LH4-B800E Service Manual

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<When using the special needle plate (needle plate -RB)>
The special needle plate has a narrow cutter groove of 0.3—0.4 mm, so use the accessory positioning plate q to
adjust the cutter installation position.
Furthermore, install the cutter holder w to minimize any play in the cutter during cutting.
*
If the above adjustment is not made, the cutter may touch the needle plate, and damage to the cutter may result.
*
The special needle plate is used to prevent the cutter from getting stuck in the material and not returning.

4-12. Adjusting the cutter installation height

w
q
Adjust so that the upper thread trimmer knife and the cutter do not touch when the cutter is pushed down by hand.
If the upper thread trimmer knife extends below the cutter, pull the stop plate q forward and move the upper thread
trimmer assembly w to the left. (Fig. A → Fig. B)
1. Install the cutter with the screw w so that the top q of the cutter blade is aligned with the top of the needle plate
when the cutter is pressed down by hand to its lowest position.
For the flat cutter e, install with the screw w so that the top q of the cutter blade is 1.5—2 mm above the top of
the needle plate.
After adjusting, push the upper thread trimmer assembly w back to its original position (4-11 Fig. A).
*
q
e
Lowest
position
Top of needle plate
LH4-B800E
w
1.5 - 2 mm
Top of needle plate
4. Adjustment
Lowest
position
4 - 11

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