Automatic thread tension device for a sewing machine

Details Automatic thread tension device for a sewing machine Automatic thread tension device for a sewing machine

1987-03-17

1988-12-27

Falik, Andrew M.

Sewing

Elements

Tensioning

112278, D05B 4704

Patent

active

047932732

ABSTRACT:
An automatic thread tensioning device for positioning the crossing points of upper and lower threads in the center of thickness of a fabric undergoing stitching. The positioning is effected by making calculations based on measured results of thread tension, without needing to detect the various kinds of characteristics of fabrics, threads, or lower thread tension responding to an existing type of stitching condition. The proper upper thread tension may be determined for the stitching conditions of fabrics which have different characteristics and for stitching conditions of fabrics which have conventionally been difficult to deal with, simply by pressing buttons and making test stitchings. If an upper thread tensioning device has a motor, a stitching operation may be made more easily.

REFERENCES:
patent: 4215641 (1980-08-01), Dobrjanskyj
patent: 4289087 (1981-09-01), Takenoya et al.
patent: 4301757 (1981-11-01), Tonomura
patent: 4702185 (1987-10-01), Hanyu et al.

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