| 摘要 |
<p>A system for accurately controlling the start and stop positions for operations on conveyor-moved products (10), such as for applying glue lines (22), perforations or slits on sheets of paper uses product position rather than timing to accurately control 'on' and 'off' operation positions on the product. The entry of a sheet of paper (10), for example, onto the conveyor path (12) is noted by detecting the leading edge (L) of the paper moving past an optical sensor (20). A shaft encoder (16) continually feeds conveyor position information to a computer (18) in which desired operation 'on' (O) and 'off' (F) positions have been prestored. Thus, once the sheet of paper has entered the path, its location is always known in the computer, assuming the paper moves with the conveyor. The computer calculates desired result positions for 'on' and 'off' for each cycle of operation to be performed on the paper.</p> |
