Timing Of Needle Bar Swing - ELNA Supermatic Service Manual

14. Timing of Needle Bar Swing

The swing of the needle bar is correctly timed if when the Stitch width lever is set at 1‐4 (Zig‐zag sewing,) the
needle does not move sideways while in the material and when the Stitch length lever is set at "A" (Automatic
sewing) the feed dog does not move the material while the needle is in the material.
If the above requirements are not met, adjust as follows:
Remove needle and presser foot.
Install Cam "0" or the double Cam "101" supplied with the machine as a standard accessory.
Set stitch length regulating lever at "A" (automatic sewing).
The Cam Follower Pin on the Reversing Lever follows along
the contour of the top half of the double Cam.
While the Cam Follower Pin rides along the outer ridge of the
Cam the feed dog will move in the Forward direction.
While the Cam Follower Pin rides along the inner valley of
the Cam the feed dog will move in the Reverse direction.
The Cam Follower Pin pivots the Reversing Lever which in
turn pivots the Feed Fork to change the direction of the Feed
Dog.
Turn flywheel slowly towards you until the Cam Follower Pin
ascends one of the slopes on the upper portion of the double
cam.
Watch movement of feed fork on top of feed control shaft.
When movement of this feed fork has stopped ①, do not
turn flywheel any further.
At this moment the Cam Follower Pin has just reached the
ridge of the cam.
Check the height of the feed dog above the needle plate and
record measurement ①.
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