Singer 620 - Setting the Bight-Amplitude Stop-Plates

Adjustments
Setting the Bight-Amplitude Stop-Plates
Set index pins at correct height and time the cam
stack.
CHECK: (At No. 1 Position)
With stitch controls set at "A — L — 3”, operate
machine at slow speed and, at same time, move stitch
width (bight) lever to No. 1 position. Movement of
driving arm and vibrating bracket should stop at same
time that movement of bight lever stops at No. 1 posi¬
tion.
Loosen clamping screw in left stop-plate.
Move bight lever to No. 3 position.
Run machine at moderate speed and move bight
lever toward left, to point where there is no movement
of vibrating bracket or driving arm. DO NOT PASS
THIS POINT.
Maintain this position of bight lever, and move
left stop-plate forward (toward operator) against
bight-amplitude bracket beneath cam stack.
Hold stop-plate at this setting and tighten clamp¬
ing screw securely.
CHECK: At Mo. 5 Position:
sf.tcn-widtn bignt. .ever to .No. 5 position. Move¬
ment of arivmg arm and vibrating bracket should stop
at same time that movement of bight lever stops at
No. 5 position.
Loosen clamping screw in right stop-plate.
Move bight lever to No. 3 position.
Run machine at moderate speed and move bignt
lever toward right to point where there is no move¬
ment of vibrating bracket or driving arm. DO NOT
PASS THIS POINT.
Maintain this position of bight lever and move
right stop-plate forward (toward operator) against
bight-amplitude bracket beneath cam stack.
Hold stop plate at this setting and tighten clamp¬
ing screw securely.
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