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    • 82. 发明授权
    • Apparatus for detecting limits of travel
    • 检测行程限制的装置
    • US4133111A
    • 1979-01-09
    • US818212
    • 1977-07-22
    • David J. Logan
    • David J. Logan
    • H01H17/12B23Q5/00B23Q5/54
    • H01H17/12Y10T29/518Y10T409/300896
    • A motor driven plotter has a plotting head which is translated in two coordinate directions over the work surface of a plotting table. The plotting head is mounted on a first carriage which moves in one coordinate direction and a second carriage is mounted on the first for movement in the second coordinate direction. The limits of both carriages in each coordinate direction are directed by means of a pull cord suspended in a rectangular pattern from the first carriage. A cord portion or segment is intersected and extended by a contact at each limit of travel in the coordinate directions. A switch connected to the cord produces a limit signal when the cord is extended.
    • 马达驱动绘图仪具有绘图头,该绘图头在绘图台的工作表面上沿两个坐标方向平移。 绘图头安装在沿一个坐标方向移动的第一托架上,第一托架安装在第一托架上,用于沿第二坐标方向运动。 两个滑架在每个坐标方向上的极限通过从第一滑架悬挂在矩形图案中的拉绳来引导。 绳索部分或段在坐标方向的每个行驶极限处由接触件相交并延伸。 当电源线延长时,连接到电源线的开关产生限位信号。