| 摘要 |
A case handling machine including a programmable controller, i.e., a controller that includes a programmable CPU, for controlling the position of movable elements of the machine based on the size of cases to be handled is disclosed. The CPU is first programmed with the position of each movable element based on the size of each of the cases to be handled. Thereafter, when a box number related to the size of a particular case is inputted to the controller by an operator, the movable elements are automatically moved to the correct position. Since the movable elements are moved along interrelated axes, that could result in a conflict if the movable elements are moved in the wrong order, the controller program includes a subroutine that sets the sequence of axes movement such that conflicts are avoided. Further, movement of the movable machine elements is monitored as they are moved in a manner that senses jams, i.e., the inability of an element to move at the command of speed. In the event of a jam, element movement ends and a jam display is created. The controller uses low cost relay/motor drive systems and the controller program includes compensation for relay closure and motor up-to-speed time delays.
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