Apparatus for processing photosensitive material and area measurement method
AssigneeDainippon Screen Mfg. Co., Ltd.
InventorNaoki Tamura
Life of this patent
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Abstract
A plurality of microswitches are arranged in a photosensitive material receiving section in a row, in a direction perpendicular to the travel direction of a printing plate. The printing plate is carried while being centered with respect to a center of a transport path. The plurality of microswitches are arranged in an asymmetrical manner with respect to the center of the transport path. Thus the width of a photosensitive material can be precisely calculated with a small number of microswitches. Further, deviation of the photosensitive material from the center of the transport path can be easily detected.
Claims13
An apparatus for processing a photosensitive material centered with respect to a center of a transport path, in which said photosensitive material is processed while traveling along said transport path, said apparatus comprising:
- a plurality of photosensitive material detectors for detecting the presence or absence of said photosensitive material traveling alone said transport path, said plurality of photosensitive material detectors being arranged across the width of said photosensitive material, in an asymmetrical manner with respect to said center of said transport path;
- and
- a recognition part for recognizing the width of said photosensitive material based on how many of said plurality of photosensitive material detectors have detected the presence of said photosensitive material;
- wherein said plurality of photosensitive material detectors are alternately arranged on both sides with respect to said center of said transport path, in the order in which a distance from said center of said transport path increases.
An area measurement method for measuring the area of a photosensitive material traveling along a predetermined transport path, said method comprising the steps of:
- (a) centering said photosensitive material with respect to a center of said transport path;
- (b) detecting the presence or absence of said photosensitive material at a plurality of points of measurement across the width of said photosensitive material, said plurality of points of measurement being arranged in an asymmetrical manner with respect to said center of said transport path of said photosensitive material;
- (c) recognizing the width of said photosensitive material based on the result of detection obtained in said step (b);
- (d) calculating the size of said photosensitive material in a travel direction of said photosensitive material;
- and
- (e) calculating the area of said photosensitive material based on the width recognized in said step (c) and the size of said photosensitive material in said travel direction obtained in said step (d),
- wherein said plurality of points of measurement are alternately arranged on both sides with respect to said center of said transport path, in the order in which a distance from said center of said transport path increases.
Dependencies are inferred from the claim text.