Upper Thread Trimming - AMF SERIES S104-130 Parts And Service Manual

S-104-100
CORD TRIM ADJUSTMENTS

Upper Thread Trimming

During the machine cycle, when the sewing ends, the machine returns to the home position. However,
before returning home, the needle thread trim action trims the front leg of the thread loop. To check for
the correct timing of the trimming action, perform the following steps:
1. Turn the left hand crank through a cycle until the trip lever has been released. Turn the right hand stop
wheel until it locks. Continue turning the left hand crank until the cutting lever starts its downward mo-
tion. The lower thread draw-off should start moving to the left with the race facing the rear of the ma-
chine. The top thread trimming action should start its travel to the right. If the travel does nit begin, turn
the left hand crank until wedge H, located on cam I, can be seen through the open area of the cam case, in
front of the stitch feed assembly on the right hand side of the machine. Once the wedge can be seen,
loosen screws J and move wedge either forward or backward (forward will make the trimming action
happen sooner; backward will make the trimming action happen later) as necessary. Once the adjustment
has been made, re-tighten screws J.
2. As the machine travels through its cycle, wedge H lifts lever K
which causes the downward movement of actuator L. This
downward movement determines the amount of travel of trim
knife assembly. The travel must not be adjusted so the point of the
knife does not travel beyond the point of the left hand looper. A
minimum clearance of approximately 0.40 mm (.016") must be
maintained between the underside of the cap of the actuator and
the trim knife assembly when the trim knife assembly is
positioned over the right hand spreader stop and away from the
throat plate. To adjust, loosen nut M and turn actuator L
counterclockwise or clockwise (counterclockwise will decrease
the amount of travel; clockwise will increase the amount of
travel). Once the adjustment has been made, re-tighten nut M.
Revised 09/2004
e-mail: service@amfreece.cz; parts@amfreece.cz; website: www.amfreece.com
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