Sewing – Stitch forming – Multiple needle
Patent
1975-12-10
1977-07-19
Schroeder, Werner H.
Sewing
Stitch forming
Multiple needle
D05B 108
Patent
active
040361578
ABSTRACT:
An automatic thread changer including means to move a plurality of threaded needles, one by one, into operative connection with a needle bar assembly. The threaded needles are each secured to a particular needle holder that will be urged into operative connection with the needle bar assembly by the action of a pivotal block 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 needle bar assembly. A cam is provided to cause the needle holder and its pivotal block to rotate 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 temporarily become part of 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 preferred 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.
REFERENCES:
patent: 2556068 (1951-06-01), Crawford
patent: 2832301 (1958-04-01), Wear
patent: 3247814 (1966-04-01), Polevitzky
patent: 3641955 (1972-02-01), Brown et al.
Nerbun Peter
Schroeder Werner H.
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