Thread trimmer mechanism for sewing machines

Details Thread trimmer mechanism for sewing machines Thread trimmer mechanism for sewing machines

1990-12-07

1991-11-19

Nerbun, Peter

Sewing

Elements

Thread cutting, severing or breaking

112229, D05B 6502

Patent

active

050656830

ABSTRACT:
In a thread trimmer mechanism on a sewing machine, a movable knife for catching and cutting thread and a bobbin pressing member for pressing and applying frictional resistance to a bobbin are operated synchronously with a rotary hook assembly. After needle thread caught by a hook of the rotary hook assembly has passed the end surface of the bobbin, the bobbin pressing member presses the end surface of the bobbin. Therefore, the needle thread is prevented from being caught in the bobbin pressing member and from being excessively supplied. Almost at the same time as the bobbin pressing member presses the end surface of the bobbin, the movable knife catches and cuts the thread. Consequently, even when the movable knife pulls bobbin thread from the bobbin, the bobbin is prevented from spinning freely. As a result, only a short thread extends from the last stitch on cloth, thus enhancing the appearance of the cloth and possibly eliminating a separate trimming operation.

REFERENCES:
patent: 2555658 (1951-06-01), Ritter
patent: 4363282 (1982-12-01), Satake
patent: 4586449 (1986-05-01), Raupach

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