JPS54138448A - Copy-timing device - Google Patents

Copy-timing device

Info

Publication number
JPS54138448A
JPS54138448A JP4639278A JP4639278A JPS54138448A JP S54138448 A JPS54138448 A JP S54138448A JP 4639278 A JP4639278 A JP 4639278A JP 4639278 A JP4639278 A JP 4639278A JP S54138448 A JPS54138448 A JP S54138448A
Authority
JP
Japan
Prior art keywords
potentiometer
photosensitive drum
differential amplifier
output signal
output
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP4639278A
Other languages
Japanese (ja)
Inventor
Masaaki Mori
Michio Umezawa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ricoh Co Ltd
Original Assignee
Ricoh Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP4639278A priority Critical patent/JPS54138448A/en
Publication of JPS54138448A publication Critical patent/JPS54138448A/en
Pending legal-status Critical Current

Links

Landscapes

  • Control Or Security For Electrophotography (AREA)

Abstract

PURPOSE:To simplify the mechanism by using rotation angle detection sensor for detection of position of photosensitive drum, and to obtain good copy timing by speeding up the control action of copy sequence by constituting the control system with electronic circuit. CONSTITUTION:A potentiometer 11, which is used as rotation angle detection sensor, is directly coupled to a photosensitive drum 1, and the output signal V of the potentiometer is held in a hold circuit 12. The output signal of the hold circuit 12 and the output signal V of the potentiometer 11 are differentially amplified in a differential amplifier 13. The output of the differential amplifier 13 and the timing setting signal V2 are differentially amplified in a differential amplifier 14, of which output is inputted into a pulse generator 15. By detecting the change in the angle of rotation in the potentiometer 11, operation may be started immediately irrespective of the rotating position of the photosensitive drum 1, so that sufficient aptitude to high speed operation may be guaranteed.
JP4639278A 1978-04-19 1978-04-19 Copy-timing device Pending JPS54138448A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4639278A JPS54138448A (en) 1978-04-19 1978-04-19 Copy-timing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4639278A JPS54138448A (en) 1978-04-19 1978-04-19 Copy-timing device

Publications (1)

Publication Number Publication Date
JPS54138448A true JPS54138448A (en) 1979-10-26

Family

ID=12745865

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4639278A Pending JPS54138448A (en) 1978-04-19 1978-04-19 Copy-timing device

Country Status (1)

Country Link
JP (1) JPS54138448A (en)

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