Drive unit for sewing machine

Details Drive unit for sewing machine Drive unit for sewing machine

1993-06-10

1994-06-21

Nerbun, Peter

Sewing

Elements

Driving mechanisms

D05B 6902, D05B 6916

Patent

active

053220277

ABSTRACT:
A sewing machine of a small size is enabled to deal with a fabric of an increased size to be sewn. A vertical spacing between an upper shaft mechanism and a lower shaft mechanism is adjustable. A need for a special control circuit which is designed for matching rotational positions of an upper and a lower shaft is dispensed with. At this end, a flexible wire 30 is used to connect an upper shaft unit 1 and a lower shaft unit 2 together. A single electric motor 10 is disposed within one of the upper and the lower shaft unit while a speed increasing mechanism 20 (or a speed reducing mechanism) is disposed in the other. An air cylinder 40 enables the vertical position of the upper shaft unit 1 to be adjustable.

REFERENCES:
patent: 4013028 (1977-03-01), Murakami
patent: 4467737 (1984-08-01), Breck, Jr.
patent: 4831948 (1989-05-01), Itoh
patent: 5088429 (1992-02-01), Kanegae

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