•When needle bar observed in plain
view from above, it can be se
e that the guides of a guide bar are required to execute a
compo
und lapping movement composed of two separately derived
motions-
1. A sewing motion
2 .A shogging motion
Swinging motion:
•The swing motion is an arc from the
front of the m/c to the hook side and
a later return swing. It occurs
between adjacent need
les and is a fixed, collective and
automatic action for all the
guide bars as they are pi
voted on a common rocker shaft.
Shogging movements:
•The sideways shogging movements which occurs parallel to the underlaps and overlaps. The occurrence, timing, direction and extent of each shog is separately controlled for each guide bet by each guide bar by its pattern chain links or pattern wheel. Attached to a horizontal pattern shaft driven from the main cam shaft but set at right angles to it at one end of the m/c.
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