JUKI MB-377 - Adjustment of Automatic Thread Trimmer; Thread trimmer mechanism and components; Clearance: button clamp lever and adjusting screw

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(1) The mechanism and the name of each component of the thread trimmer
As shown in the figure below, when the button clamp lifting lever is actuated at the final stitch, the
thread trimming connecting link (rear) moves forward, causing the thread separating claw of the moving
knife to separate thread before it is trimmed by the knife.
Unlike MB-372, the stop-motion timing is delayed so that thread is trimmed after a stitch is tightened by
the thread take-up lever, eliminating the possibility of broken stitches.
(2) Clearance between the button clamp lifting lever and the adjusting screw
3. ADJUSTMENT OF AUTOMATIC THREAD TRIMMER
Standard Adjustment
Nipper bar bearing block
Nut
Screw
Button clamp lifting lever
Button clamp lifting link
Thread trimming lever base
Thread trimming lever
Thread trimming
connecting link (front)
Thread separating
claw of the moving knife
Fixed knife
Moving knife
Spring guide shaft
Spring
Washer
Joint
Button clamp
lifting rod
Thread trimming connecting link (rear)
Throat plate
Cushion
Thread trimming link
0.5 mm
1
2
3