Sewing machine control device
US4509445A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 4, 1983 |
| Grant date | Apr 9, 1985 |
| Priority date | — |
| Expiry date | Feb 4, 2003 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD05B69/20
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A control device for a sewing machine, in which the numbers of stitches in forward and backward feed of an article to be sewed are preset, comprises: a reverse-stitching electromagnetic operating unit for reversing the direction of feed of the article; a control unit for applying instruction signals to the electromagnetic operation unit to control the latter; and delay means for controlling the operation delay time between the turning "on" or "off" of the electrical instruction signal which is applied to the electromagnetic operating unit by the control means and the turning "on" or "off" of the electromagnetic operating unit. The time instant that the instruction signal is turned "on" or "off" by the control means is caused to occur a period of time, corresponding to the operation delay time, earlier than a predetermined time instant, so that the number of stitches preset is equal to the number of stitches actually formed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.