G - Physics – 05 – B
Patent
G - Physics
05
B
340/124.1, 342/1
G05B 11/01 (2006.01) F16P 3/14 (2006.01) G01V 8/20 (2006.01)
Patent
CA 1093192
ABSTRACT OF THE DISCLOSURE A presence sensor for safeguarding a machine has a plurality of light sources and opposed light detectors provi- ding a protective curtain in front of an area to be protected. The photodetectors are connected to respective gates which are enabled in sequence as the corresponding light sources are energized in sequence. Each light path that is obstructed causes a pulse from the gates and these pulses are totalled for each sequence to provide a total count output. A compar- ator compares the total count output to a predetermined number representing a permissible number of obstructed light paths. If the total count output exceeds the predetermined number the comparator provides a signal which stops the machine. The predetermined number is set at a low number which is sufficient to permit material to be fed into the machine through the protective curtain but which is not sufficient to permit the operator to reach the dangerous operating area. In the prior art it is possible to set the safeguard to permit certain light paths to be obstructed and no others. Thus a change in the angle of feed as the material extends through the curtain could stop the machine unnecessarily. The presence sensor of this invention permits the obstructed light paths to be anywhere as long as the number obstructed does not exceed the predetermined number so that the angle of feed can be changed from horizontal if this is necessary or the material can be bent in the machine causing a projecting part to alter its position in the curtain stopping the machine. Different die heights can be used in the machine without altering the set-up of the guard curtain.
304624
Canadian General Electric Company Limited
Eckersley Raymond A.
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