公开(公告)号：US4622910A

公开(公告)日：1986-11-18

申请号：US745892

申请日：1985-06-18

申请人： Otto Hangarter ,  Hansulrich Lerch ,  Otmar Stillhard

发明人： Otto Hangarter ,  Hansulrich Lerch ,  Otmar Stillhard

IPC分类号： D05B3/06 ,  D05B3/24

CPC分类号： D05B3/24

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.

摘要翻译： 按钮孔压脚可纵向滑动地接合在与缝合材料一起被带走的框架状滑动件中。 滑动件包括在纵向方向上拉伸的绳索，其包围压脚柄的轴的下端。 在轴的顶端设置有叶轮，光源的光束通过该叶片朝向光电换能器出射。 在缝纫操作期间，滑动件与缝纫材料一起移动，并驱动叶轮，该叶轮分别产生与滑动件的缝合材料的运动步骤对应的脉冲。 为了确定电线的长度，每次都对每个脉冲进行确定的步数。 这允许可靠和精确地确定线的长度。