An apparatus for trimming and for the automatic cutting of images from paper and other graphic and photographic substrates, in particular with a large size

摘要

A device for trimming and automatically cutting of either multiple or single images is described produced for example through digital rendering on paper and other graphic and photographic substrates, wound in reel or being in single sheets (10), especially of large size. The problems met in using known devices of this type with feeding rollers (2) with a length corresponding to the substrate width have the consequence of a slowing down of the production owing to the excessive care to be taken when introducing at the same time parallel sheets of large size. These problems can be overcome by using rollers of reduced length, but only by adding errors in the forward movement of the substrate, errors which are remedied by means of optical sensors (4, 4') for detecting the separation mark (M) between the images (10a, 10b, .....) as well as its angle with respect to the cutting line (7), and by a pair of length differences measuring devices (6).