| 摘要 |
PURPOSE:To eliminate complication in change-over into a jog feed mode which is used for several purposes to prevent overtravel during several kinds of manual operations in order to enhance the manipulatability, by disposing a control panel logic circuit between the control panel and a drive control circuit. CONSTITUTION:A manual feed mode H/S is selected by a mode selection switch 2 on a control panel, and when any one of feed switches 3 is selected, the control panel is connected to a control circuit 17. Further, a signal 1 is delivered through OR gates 25, 26 to an inverter 27 so that a signal on the output side is reversed into zero, resulting in an AND gate 24 delivering a signal 0 to deny the manual feed. Accordingly, the signal 1 is delivered through an manual feed. Accordingly, the signal 1 is delivered through an inverter 28 to an OR gate 22 to establish a jog feed mode JOG. Further, when the turning direction of the feed switches 3 is the same as the direction of return to the original point, inputs +X, +Z establish an original point return mode ZRN by means of the OR gates 25, 23, and the turning of the switch 1 is made to be preferential without mode change, thereby it is possible to prevent overtravel.
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