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7-5. How to changing the thread take up lever stroke
The thread take up lever stroke can be change to 77.1 mm or 74.1 mm by the following procedures. By
changing the thread take up lever stroke smaller (74.1 mm), take up efficiency of needle thread is improved,
and stitch tightness will be improve even though the amount of the supply to the rotary hook is reduced.
NOTICE There may be causes thread breakage or abnormal stitch tightness depending on the type of the
sewing material or thread. When changing the thread take up lever stroke, please execute enough sewing
test and check whether or not the stitch performance has a problem.
(1) Turn the power switch off then, remove the face cover.
(2) Loosen the screw (No.2) that fixing the eccentric bushing (No.1) by inserting a hexagon wrench 2.5
into the hole which has machine head top.
NOTE The eccentric bushing (No.1) has contact surface for screw (No.2). To prevent the eccentric bushing
(No.1) being caught please loosen the screw (No.2) enough.
<1>: Eccentric bushing <2>: Screw
<2>
<1>
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