When one complete layer has been
wound on the bobbin, it is necessary to reverse the direction of the rail for
the next layer.
This is done automatically through the control of the
“builder”. The more common mechanical means used for this purpose is a grasp of
three bevel gears in the lay gearing train.
Two large bevel gears are mounted
on the same shaft in such a manner that with a short travel movement either of
the two may be driven by the third, a small bevel gear.
As one large bevel gear
is driven from the left sideof the small bevel gear, one will cause the rail to
descend.
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