35
RELATIONSHIP BETWEEN TAKE-UP LEVER AND HOOK
The following pictures show the location of hook when the take-up lever starts to move up from the lower
dead stop (main shaft rotation angle: 295°).
Too
small
When the hook timing falls in the A range (see
illustration below) the loop will be too small. Stitch
formation will take place faster than the upward
movement of the take-up lever. The thread will be
too loose and looping and skipped stitches will
occur.
If the hook timing falls in the B range (see below),
the hook point will catch the thread when the loop is
too big. This will cause thread breaks since the
upward movement of the take-up lever is faster then
the rate at which the thread comes off the hook.
Too
Large
(B)
(C)
(A)
CAUTION
When the hook timing is correct, the
hook should move within the C range.
In case of fast hook timing
In case of slow hook timing
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