Check For The Stop Position Of The Sewing Machine (Automatic Thread Trimmer) - SunStar KM-757 User Manual

(2) Adjustment of the location detector
A. For Servo motor (in-built location detector)
Adjust the up-stop position of the needle such that the white carved sign on the pulley ③ is in a straight line with the carved
sign on the arm ④ when the needle has stopped in the air. That adjustment can be made by loosening the pulley' s clamp
screw① on the side with N·U carved signs and moving it sideways. Adjust the down-stop position of the needle such that
the needle is on the point of moving up when the needle bar is at the lowest point. This adjustment can be made by loosening
the pulley' s clamp screw ② on the side with N·D carved signs and moving it sideways. (See Figure 14 & 15.)
B. For 470 motor (external location detectors)
Turn the pulley manually to position the needle bar at the lowest point about to move back up. Then, loosen the fixed
screws on the film as in Fig. 12 and align the "DOWN"film with the film adjustment baseline and the sensor housing
baseline as in Fig. 16 & 17. Tighten the fixed screws just enough so that the film does not rotate. In the same way, place
the thread take-up lever at the highest point, then loosen the fixed screws again and adjust the "UP" film as in shown the
figure. Be careful that the "DOWN" film A that was tightened before does not move when adjusting the "UP" film.
Setting the film when
Setting the film when the
the needle is in a up-
thread take-up lever is at
stop position
the highest point
9) Check for the stop position of the sewing
machine (automatic thread trimmer)
Check for the machine stop position after moving the needle up
and down by pushing the reverse button. See whether the carved
sign on the arm and the white carved sign on the pulley are aligned
when the needle is in an up position. If not, adjustment to the
photo film of the location detector or to the location of the
magnetic holder will be necessary since there may be problems
with the trimming. In other words, the needle' s up-stop position
should be identical with the stop position of the needle bar after the
trimming operation, which would signify that there is nothing
wrong with the operation timing of the trimmer. (See Fig. 18.)
(Refer to the explanation about the Adjustment of Location
Detector on page 13.)
14
[Figure 14]
Film-Adjusting Arrow
Setting Area
Sensor Baseline
[Figure 16]
Up-Stop Down-
Stop
Position
Position
[Figure 15]
Film Adjusting
Base
Sensor Base
[Figure 17]
Thread take up lever
up-stop position
Needle
bar
frame
[Figure 18]