发明名称 |
BUTTON HOLE SEWING DEVICE |
摘要 |
The button hole presser foot engages longitudinally slidably in a frame like slide which is taken along with the sewing material. The slide comprises a cord stretched in the longitudinal direction which encircles the lower end of a shaft of the presser foot shank. At the top end of the shaft is provided an impeller through which a light beam of a light source emerges toward a optoelectric transducer. During the sewing operation the slide moves with the sewing material and it drives the impeller which generates pulses each corresponding to a step of the motion of the sewing material, respectively of the slide. For determining the length of the cords, a determined number of steps, respectively of pulses is counted each time. This permits a reliable and precise determination of the length of the cords. |
申请公布号 |
DE3562026(D1) |
申请公布日期 |
1988.05.05 |
申请号 |
DE19853562026 |
申请日期 |
1985.06.04 |
申请人 |
FRITZ GEGAUF AG BERNINA-NAEHMASCHINENFABRIK |
发明人 |
HANGARTER, OTTO;LERCH, HANSULRICH;STILLHARD, OTMAR |
分类号 |
D05B3/06;D05B3/24;(IPC1-7):D05B3/24;G01D5/36 |
主分类号 |
D05B3/06 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|