| 摘要 |
An apparatus is disclosed for placing chop-marks on the back of a web of photographic prints to facilitate the automatic chopping of the web into individual prints. The apparatus includes a first photoelectric cell that is located downstream of a marker, and which cell, in cooperation with logic circuitry, is used to so control a web drive means that the web is stopped at particular intervals so that a chop-mark may be placed on the back of each print. The apparatus further includes a second photoelectric cell located upstream of the marker which, in cooperation with the logic circuitry, is adapted to check the web for chop-marks which have previously been placed on the back of some of the prints so that the prints having such pre-existing chop-marks are advanced past the marker without having a second mark placed thereon.
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