| 摘要 |
A double blank detector apparatus and method of operation determines the condition of when one blank, no blanks or more than two blanks are about to be fed into a press. An indicator bar advances relative to the number of blank sheets of material being detected and interrupts an infra-red light beam when only blank of material has been detected. Under this preferred condition, a signal is produced which allows a press located adjacent to the double blank detector to continue its stamping operation. Alternatively, if either a no blank or a double blank condition is sensed, then the indicator bar advances accordingly, thus not interrupting the infra-red light beam. During this condition, a signal is produced indicative of the situation thus notifying the operator that there is a problem and stopping the press from cycling.
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