Needle thread feed control apparatus for sewing machine
US5404824A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 28, 1993 |
| Grant date | Apr 11, 1995 |
| Priority date | — |
| Expiry date | Oct 28, 2013 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD05B65/00
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A thread control apparatus having first and second thread retainer or holder mechanisms on a thread path, a feed passage control mechanism adapted to obtain the thread in a zig zag form between the first and second thread holder mechanisms, and a controller actuated to allow these holder mechanisms to be in a thread hold condition and a thread release condition, respectively, just before starting thread cutting or trimming operation. Slack is provided in the thread by deactuating the feed passage control mechanism after the thread has been delivered from the thread supply source by operation of the feed passage control mechanism. The thread is released by the first thread retainer mechanism and held by the second thread retainer mechanism until the next sewing operation is started upon trimming or cutting the thread to render the thread path longer by means of the feed passage control mechanism, thereby drawing back the residual thread.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.