# US 5,704,302 A · Looper device having a thread feeding mechanism

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- Number: US 5,704,302 A
- Document ID: US5704302A
- Status: Granted
- Kind: A
- Application number: 08/719,429
- Filed: 1996-09-25
- Granted: 1998-01-06
- Earliest claimed: 1996-09-25
- Inventors: Hsien Chang Tseng
- Web page: https://patentgrep.com/patent/US5704302A

## CPC

- D05B 57/02: for chain-stitch sewing machines, e.g. oscillating
- 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

A looper device includes a rod slidably supported in a sewing machine and allowed to move up and down. A looper is secured on the upper end of the rod and includes a hole formed in the front end and includes a support formed on the rear portion. A lever is coupled to the support at a pivot shaft and includes an extension extended from the front end for engaging with the front end of the looper and forming a shoulder which may engage with and may feed a thread upward. The lever includes a member for positioning the lever relative to the looper.

## Claims

### Claim 1

A looper device for a sewing machine, said looper device comprising:
a rod slidably supported in the sewing machine and being allowed to move up and down, said rod including an upper end,
a looper secured on said upper end of said rod and moved up and down in concert with said rod, said looper including a front end having a hole formed therein and including a rear portion having a support provided thereon, and
a lever pivotally coupled to said support at a pivot shaft for allowing said lever to be rotated about said pivot shaft between an open position and an enclosed position, said lever including a front end having an extension extended therefrom for engaging with said front end of said looper, said extension of said lever including a bottom portion having a hook laterally extended therefrom for engaging with said hole of said looper, said extension and said front end of said looper forming a shoulder for engaging with a thread and for feeding the thread upward when said lever is moved to and located at the enclosed position, and said extension being disengaged from said front end of said looper for allowing the thread to move to the rear portion of said looper when said lever is located at the open position.

### Claim 2 (depends on 1)

A looper device according to claim 1, wherein said lever includes a rear portion having a handle provided thereon for operating said lever.

### Claim 3 (depends on 1)

A looper device according to claim 1, wherein said support includes two first engaging members provided thereon, said lever includes a leg extended therefrom, said leg includes a second engaging member for engaging with said first engaging members of said support and for positioning said lever at the open position and the enclosed position respectively.