Patent Number: 6,167,826

Title: Device for supplying upper thread of sewing machine

Abstract: An upper thread supply device includes a drive roller 50 and two slave rollers 52, 54. The slave roller 52 has a thread contacting portion 52a formed from a soft metal. The slave roller 54 has a thread contacting portion 54a formed from a resilient material. The drive roller 50 is formed from a hard metal. A thread is supplied by the upper thread supply device following a thread feed pathway. The drive roller 50 and the soft metal thread contacting portion 52a sandwich the thread at one position along the thread feed pathway and the drive roller 50 and the resilient thread portion 54a sandwich the thread at a separated position along the thread feed pathway. The resilient thread contacting portion 54a is positioned downstream from the position where the thread is sandwiched by the hard metal thread contacting portion 54a and the soft metal thread contacting portion 52a. The hard metal thread contacting portion of the drive roller 50 and the soft metal thread contacting portion 52a sandwich the thread and prevent it from being excessively drawn out from the thread spool by vertical movement of a thread take-up lever. The hard metal drive roller 50 and the resilient thread contacting portion 54a mainly reliably feed out the upper thread by sandwiching the upper thread there-between.

Inventors: Funato; Nobuhiko (Nagoya, JP)

Assignee: Brother Kogyo Kabushiki Kaisha

International Classification: D05B 47/00 (20060101); D05B 047/00 ()

Expiration Date: 01/02/2018