Two special optical sensors, installed above the feed opening to scan it, form part of the solution for the safe cardboard feed on the tray former. If these signal that there are insufficient cardboard blanks in the infeed, then PNOZmulti 2 triggers an immediate stop of the hazardous movement. Once the cardboard stocks have been refilled, the machine can be restarted following an acknowledgement. There’s no need for rigid safeguards, so operators have the flexibility to feed the machine from both sides. The safety switches PSENcode are also part of the solution: As many of the blanks are smaller than the opening on the tray former, a precisely contoured perspex screen seals off the uncovered area. This is called up by the tamper-proof, coded safety switch. It’s a total solution, which increases process efficiency and significantly reduces downtimes on the tray former. http://www.pilz.com
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