Embroidery sewing machine with lower thread winding device
US6578503B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 30, 2002 |
| Grant date | Jun 17, 2003 |
| Priority date | — |
| Expiry date | May 30, 2022 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD05B57/143
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
In an embroidery sewing machine having a lower thread winding device, when the non-lower thread state of the bobbin is detected by a residual amount sensor, a sewing machine motor is stopped to detect and recognize the size of the embroidering frame of an embroidering device by means of a frame size sensor and the embroidering frame is moved corresponding to the size to position the corner of a workpiece held in the embroidering frame under a needle. Then, an extra sewing operation is carried out over the corner to consume the lower thread remaining in the bobbin, and subsequently, it is decided whether or not the embroidering frame is moved by a distance required for completely extracting the lower thread from the bobbin (an amount of the residual lower thread is detected when the non-thread state is detected by the residual amount sensor). If the distance is insufficient, the destination of the embroidering frame is updated to repeat the extra sewing operation over the next corner of the workpiece S, thereby completely extracting the lower thread from the bobbin.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.