Sewing – Stitch forming – Multiple needle
Patent
1976-07-29
1978-02-28
Schroeder, Werner H.
Sewing
Stitch forming
Multiple needle
D05B 108
Patent
active
040759580
ABSTRACT:
A sewing machine automatic thread changer including means to move a plurality of threaded needles, one by one, into operative connection with a sewing machine's needle bar. The threaded needles are each secured to a particular needle holder that will be urged into operative connection with the sewing machine's needle bar assembly by the action of sliding the holder in accordance with movement of a travelling carriage. Each needle holder carries a different color thread such that the color of the thread is automatically changed by appropriate travel of the carriage to position the particular needle holder into operative connection with the common needle bar assembly. A cam is provided to cause the needle holder to pivot the needles not being used to a position that is clear of the operator while the needle holder that is being used will be pivoted downwardly under the action of the cam, such that the particular needle holder will be in position to slide or move into the needle bar assembly. A thread release and guide is also provided which will exert a tight clamping action on each thread to hold the thread immobile while the carriage is moving and then release the thread when the movement of the carriage ceases. In the first embodiment of the invention, the carriage travels back and forth under the driving force of a stepping motor as actuated by a switch or series of switches.
In another embodiment a needle holder is released from a shot pin and another needle holder is advanced into operative connection therewith.
REFERENCES:
patent: 2556068 (1951-06-01), Crawford
patent: 2832301 (1958-04-01), Wear
patent: 3247814 (1966-04-01), Polevitzky
Cohen Moshe I.
Schroeder Werner H.
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