公开(公告)号：US4574719A

公开(公告)日：1986-03-11

申请号：US625119

申请日：1984-06-27

申请人： Siegmund Balke

发明人： Siegmund Balke

IPC分类号： D05B21/00 ,  D05B35/10 ,  D05B69/24 ,  G01B11/06 ,  G01B15/00 ,  G01B15/02 ,  H03K17/94 ,  D05B35/00

CPC分类号： H03K17/941 ,  D05B35/102 ,  D05B69/24

摘要： A workpiece fed to a stitching point of a sewing machine, consisting of one or more layers of fabric, is transluminated by a source of visible or infrared radiation which is intercepted by two photoelectric sensors following each other in the direction of motion. The sensors work into respective radiation/frequency converters whose output voltages, after rectification, are compared in a window discriminator to provide an indication of the passage of a leading or trailing edge of a fabric layer manifesting itself in a jump in one of the voltages. The jump is intensified by a threshold circuit in each converter, comprising a Zener diode which for highly light-transmissive fabric layers can be short-circuited by an optocoupler.

摘要翻译： 馈送到缝纫机的缝合点的工件由一层或多层织物组成，由可见或红外辐射源平移，两束光电传感器在两个光电传感器之间沿着运动方向彼此相邻。 传感器工作在相应的辐射/频率转换器中，其整流后的输出电压在窗口鉴别器中进行比较，以提供在其中一个电压中跳跃的织物层的前沿或后沿通过的指示。 跳变由每个转换器中的阈值电路加剧，包括齐纳二极管，其对于高度透光的结构层可以由光耦合器短路。

公开(公告)号：US4858545A

公开(公告)日：1989-08-22

申请号：US52717

申请日：1987-05-21

申请人： Siegmund Balke ,  Gunter Lutkemeyer

发明人： Siegmund Balke ,  Gunter Lutkemeyer

IPC分类号： D05B69/00 ,  D05B69/20

CPC分类号： D05B69/20

摘要： A sewing machine adapted for moving a workpiece in a downstream direction for sewing a seam therein, and for automatically terminating the seam at a predetermined point a selected distance from a trailing edge of the workpiece. An edge sensor on a base is located a predetermined distance upstream of the sewing point for sensing the downstream passage of the trailing edge, and generating edge sensing signals in response thereto. A stroke sensor on the base senses the length of the strokes of the feed dog and generates stroke length signals which are indicative of the stroke length and of the length of the stitches. A stopping device is provided on the base for being actuated to engage the workpiece to stop its movement when the sewing needle is at the predetermined point for terminating the seam; and a control system receives the edge sensing signals and the stroke length signals, determines therefrom a time when the sewing needle will be at the predetermined point, and generates a stopping signal for actuating the stopping device at that time.

摘要翻译： 一种适于在下游方向上移动工件以缝合其中的接缝的缝纫机，并且用于在距工件的后缘一定距离的预定点处自动地终止接缝。 基座上的边缘传感器位于缝合点上游预定距离处，用于感测后缘的下游通道，并响应于此产生边缘感测信号。 基座上的行程传感器感测进给针的行程的长度，并产生指示行程长度和针迹长度的行程长度信号。 在所述基座上设置有止动装置，用于当缝纫针处于预定点以终止接缝时被致动以接合工件以停止其运动; 并且控制系统接收边缘检测信号和行程长度信号，从而确定缝纫针处于预定点的时间，并且产生用于在此时启动停止装置的停止信号。