| 摘要 |
A guard means for machines such as pressbrakes, guillotines, stamping machines and the like, in the case of which a first machine part performs working movements toward a second machine part. At least one photoelectric detector, more especially a laser photoelectric detector, has its light beam extending perpendicularly to the direction of working movement and is able to be so positioned between the two machine parts at one thereof that its light beam is at a safety distance from such machine part, such safety distance being able to be set by means of a guard means arranged adjustably on this one machine part, such guard means bearing the at least one photoelectric detector. A halting means is adapted to arrest the working movement on interruption of the light beam and a switching off means serves for switching off the halting means directly prior to interruption of the light beam. Furthermore there are means for the performance of a first movement of the guard means as far as interruption of the light beam by the machine part bearing the guard means and the performance of a second movement of the guard means in the opposite direction, the displacement or distance traveled, which sets the safety distance, in the second movement being able to be predetermined by an electrical measuring and/or control means. Accordingly for such adjustment no additional adjustment photoelectric detector is required and the adjustment may be performed in a simple manner by a single operator.
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