Method and machine for positioning films on base sheets

摘要

A method and machine for positioning films on base sheets are disclosed. A first film on a base sheet is laid out into a desired position on a base plate, and positions of edges of a picture pattern on the first film are detected by photoelectric detectors including photoelectric elements which detect the edges and output signals whose strengths are varied depending on the positions of the elements with respect to the edges. Then, a second film on a base sheet is put on the first film so that edges of a picture pattern of the same shape as in the first film, on the second film may approximately overlap to those of the first film, and the edges in the second film are completely coincided with those in the first film by moving the second film by means of a drive means according to the output signals from the elements, thereby positioning the second film into the desired position.