Sewing – Stitch forming – Multiple machines
Patent
1984-03-30
1985-07-30
Hunter, H. Hampton
Sewing
Stitch forming
Multiple machines
112163, 112221, 112247, D05B 2500, D05B 6902, D05B 4900
Patent
active
045314675
ABSTRACT:
A thread take-up arm drive means for a multihead embroidery machine in which identical heads have automatic color change capability such that the color thread stitched on the plurality of embroidery heads is changed substantially simultaneously. A sliding carriage associated with each head contains a plurality of associated color stitching sets of thread take-up arms and needle bars. Each color stitching set is for stitching a different color thread. A computer controls a step motor to position the carriage and thus place the particular color stitching set in contact with the drive means. The thread take-up arm drive means is a pushplate biased in an up position by a leaf spring having adjustable tension. A cam follower is attached to the pushplate and moves the pushplate cyclically under force of and according to the design of the periphery of a cam. The cam is attached to the drive shaft that drives both the thread take-up arm and the needle bar of a color stitching set. The downward movement of the cam follower coincides with raising the thread take-up arm to pull the thread stitched taut and raising the needle out of the workpiece. The drive shaft does not operate during the color change operation.
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Tajima Drawing.
Golia Kenneth R.
Golia, Jr. Dominick
Hunter H. Hampton
Isackson Robert M.
Jackson Robert R.
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