Control circuit for an electrostatic copying apparatus
AssigneeMita Industrial Co., Ltd.
InventorsMasahiro Yoshioka, Masahiro Murakami, Yoichiro Irie, Tsugio Nakanishi, Eiji Tsutsui, Noriyuki Iwao, Junichi Hirobe, Takahiro Wakikaido
Life of this patent
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Abstract
An electrostatic copying process and apparatus capable of forming copies in at least two different ratios. The formation of a copied image involves exposure scanning of the image of an original document and projecting it on a photosensitive member through an optical device. The change of the ratio of copying is achieved by changing the ratio of projection of the image of the document onto the photosensitive member by the optical device, and also changing the speed of scanning.
Claims5
An electrostatic copying apparatus adapted for copying at variable ratios comprising
- an optical device including at least one optical element mounted so that it can freely move between at least two positions including an equal scale position for projecting the image of an original document on a substantially equal scale onto a photosensitive member and a predetermined ratio position for projecting the image of the document at a predetermined ratio onto the photosensitive member,
- a drive source drivingly connected to said at least one optical element for moving it, and
- a control circuit which comprises an equal scale position detecting switch for detecting said at least one optical element when it is positioned at said equal scale position or its vicinity and thereby producing a signal indicating the equal scale position, a predetermined ratio position detecting switch for detecting said at least one optical element when it is positioned in said predetermined ratio position or its vicinity and thereby producing a signal indicating the predetermined ratio position, and a change-over switch to be manually operated, and which when the change-over switch is operated during the production of said equal scale position signal, energizes the drive source to move said at least one optical element to said predetermined ratio position, and when the predetermined ratio position signal is thereby produced, deenergizes the drive source after the lapse of a predetermined delay time, and which when the change-over switch is operated during the production of the predetermined ratio position signal, energizes the drive source to return said at least one optical element to the equal scale position, and when the equal scale position signal is thereby produced, deenergizes the drive source after the lapse cf a predetermined delay time;
- characterized in that said control circuit further comprises a power supply detector adapted to form a signal indicating the operation of a power supply when a power supply switch of the copying apparatus is closed, and when the signal indicating the operation of the power supply is produced, the control circuit energizes the drive source to return said at least one optical element to the equal scale position if the equal scale position signal is not produced, and energizes the drive source to move said at least one optical element to the predetermined ratio position and then return it if the equal scale position signal is produced.
Dependencies are inferred from the claim text.