# US 4,393,798 A · Rotary shuttle for a sewing machine

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- Number: US 4,393,798 A
- Document ID: US4393798A
- Status: Granted
- Kind: A
- Application number: 06/191,537
- Filed: 1980-09-29
- Granted: 1983-07-19
- Earliest claimed: 1980-09-29
- Inventors: Haw-Lin Cheng
- Web page: https://patentgrep.com/patent/US4393798A

## CPC

- D05B 57/26: Bobbin holders or casings; Bobbin holder or case guards; Bobbin discharge devices
- D05B: SEWING (appliances for the tailoring trade A41H; sewing tables A47B29/00; sewing in bookbinding B42B2/00; sewing machines modified for knitting D04B39/08)

## Abstract

An internal housing comprises an upper part 1, a lower part 3 and a middle part 2. The middle part 2 connects the internal housing to an external housing 4 to form a rotary loop taker. The external housing 4 comprises an elastic piece 6 for engaging thread as well as a tail base 42 and an internally tapered ring 5 for fitting the loop taker into a sewing machine. The middle part 2 provides a ring about which the external housing 4 is rotatable, and to facilitate this rotation, this middle part is of or coated with Teflon.

## Claims

### Claim 1

A rotary loop taker for a sewing machine comprising:
(a) an internal housing comprising an upper part and a lower part held together by a ring which forms a middle part of the internal housing;
(b) an external housing comprising a tail base over which can be fitted an internally tapered member for fitting the loop taker into a sewing machine; and
(c) a flexible piece fixed to the external housing, the external housing and flexible piece being free of screw holes and the ring having a Teflon coating so that the internal and external housings are rotatable relative to each other.

### Claim 2 (depends on 1)

The loop taker of claim 1 wherein the upper and lower parts of the internal housing are provided with oblique grooves for engagement therein with mating oblique lips provided in the ring.