Singer Confidence 7463 Service Manual page 28

Origin point positioning of stitch length
In case of large deviation, adjust as follows:
Note: There are two stitch length mechanisms – half-step and full-step versions.
(A) Stitch length (Half-step version)
*Stitch length mechanism on half-step version
Step motor rotates 7.5 degrees with one pulse and this amount of rotation makes feed
regulator rotate 3 degrees under ratio of 1 : 2.5 of motor gear vs feed regulator gear. This
amount of rotation makes stitch length vary by 0.5 mm.
Stitch pitch of 0.25 mm is half amount of above so that step motor is held at non-exciting
position which is midway between exciting positions
1. Turn off power switch.
2. Loosen one of two screws on motor gear.
3. Turn on power switch and set machine at test mode 2［Zero feed］and motor shaft will be
held at one of exciting position.
4. Loosen other screw on motor gear for adjustment and motor gear will become free from motor
shaft.
5. Rotate the projection (1) of motor gear until it touches with the stopper pin and you will get
position for origin point positioning.
Switch
Stopper pin
Screw
Loosen this screw
before adjustment
Projection (1) of motor gear.
Stopper pin
Projection (2)
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