Title:
EDGE DETECTOR FOR PLATE MAKING MACHINE
Document Type and Number:
Japanese Patent JP3267201
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To obtain an edge detector capable of accurately detecting the position of the leading edge of a master sheet supplied to a feeding roller.
SOLUTION: The plate making machine is constituted so that the master sheet X is supplied to the peripheral surface of the feeding roller 6 whose speed is controlled and which is driven to be rotated in a subscanning direction, and image information is exposed on the photosensitive surface of the master sheet X by main scanning. In such a case, the detector ES is provided with a light emitting element (es1) which is positioned to face to the peripheral surface of the roller 6 just before a main scanning position and whose light emitting surface is standardized to the photosensitive surface of the master sheet X and a light receiving element (es2) which receives reflected light from the photosensitive surface. The element (es1) is turned on before detecting the passing master sheet X and turned off at a fixed time after output from the element (es2) which detects the leading edge of the master sheet X.
Inventors:
Hiroyuki Nagakura
Kimiya Yamada
Kimiya Yamada
Application Number:
JP19492897A
Publication Date:
March 18, 2002
Filing Date:
July 04, 1997
Export Citation:
Assignee:
Iwasaki Tsushinki Co., Ltd.
International Classes:
G03G21/14; B41C1/00; G03G13/28; G03G15/10; (IPC1-7): G03G13/28; G03G15/10; G03G21/14
Domestic Patent References:
| JP2262667A | ||||
| JP61210339A | ||||
| JP4101168A | ||||
| JP4107573A | ||||
| JP6213963U |
Attorney, Agent or Firm:
Akihiro Ohta