Table of Contents
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Original issue
Service Manual
Sept.2010
Page 33/41
Model
18. Stitch length
160
(A) Checking meshing position of gears
This procedure is needed only when disassembling and re-assembling cams.
Rotate motor gear clockwise to touch it with stopper pin and mesh these gears so that
feed regulator gear may be positioned with full two gears below line from feed regulator to
motor gear
（B）Origin point positioning of stitch length
Step motor rotates 7.5 degrees with one pulse, but ratio of motor gear vs. feed regulator
gear is 1：6.25. This amount of rotation makes feed regulator rotate 1.2 degree.
This amount of rotation makes stitch length vary by 0.2 mm. 0.2 mm stitch pitch moves at
each of 7.5 degree exciting position.
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