JPS56123557A - Speed controller for electric photocopy machine - Google Patents

Speed controller for electric photocopy machine

Info

Publication number
JPS56123557A
JPS56123557A JP2610080A JP2610080A JPS56123557A JP S56123557 A JPS56123557 A JP S56123557A JP 2610080 A JP2610080 A JP 2610080A JP 2610080 A JP2610080 A JP 2610080A JP S56123557 A JPS56123557 A JP S56123557A
Authority
JP
Japan
Prior art keywords
speed
signal
photosensitive drum
response
circuit
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.)
Granted
Application number
JP2610080A
Other languages
Japanese (ja)
Other versions
JPS6365935B2 (en
Inventor
Takehiro Yoshimura
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 JP2610080A priority Critical patent/JPS56123557A/en
Publication of JPS56123557A publication Critical patent/JPS56123557A/en
Publication of JPS6365935B2 publication Critical patent/JPS6365935B2/ja
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B27/00—Photographic printing apparatus
    • G03B27/32—Projection printing apparatus, e.g. enlarger, copying camera
    • G03B27/52—Details
    • G03B27/522—Projection optics
    • G03B27/525—Projection optics for slit exposure
    • G03B27/526—Projection optics for slit exposure in which the projection optics move

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • General Physics & Mathematics (AREA)
  • Variable Magnification In Projection-Type Copying Machines (AREA)
  • Optical Systems Of Projection Type Copiers (AREA)
  • Control Or Security For Electrophotography (AREA)
  • Exposure Or Original Feeding In Electrophotography (AREA)

Abstract

PURPOSE:To enable accurate speed control with a simple constitution, by amplifying the variance detection signal of the photosensitive drum drive speed in response to the speed ratio and adding it to the lens scan drive control reference voltage corresponding to the speed ratio. CONSTITUTION:The speed of the photosensitive drum drive section is detected at a speed detector 28, and the signal in response to the variance from a given speed is produced via the frequency-voltage conversion circuit 30 and level shift circuit 32, and it is amplified at the amplifier 33 in which the amplification factor is changed according to the set speed range via the magnification set circuit 37. This signal is added to the reference voltage in response to the set speed ratio output at the reference voltage set circuit 34, and it is compared with the detected speed signal of the lens scan drive linear motor 41 outputted at the 2nd frequency-voltage conversion circuit 31 and fed as the set voltage to the comparator 38 in feedback control of the motor 41. Thus, the speed detection of the 1st drive section such as photosensitive drum is not required with high resolution and accurate speed control even at speed change can be made with a simple constitution.
JP2610080A 1980-03-04 1980-03-04 Speed controller for electric photocopy machine Granted JPS56123557A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2610080A JPS56123557A (en) 1980-03-04 1980-03-04 Speed controller for electric photocopy machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2610080A JPS56123557A (en) 1980-03-04 1980-03-04 Speed controller for electric photocopy machine

Publications (2)

Publication Number Publication Date
JPS56123557A true JPS56123557A (en) 1981-09-28
JPS6365935B2 JPS6365935B2 (en) 1988-12-19

Family

ID=12184167

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2610080A Granted JPS56123557A (en) 1980-03-04 1980-03-04 Speed controller for electric photocopy machine

Country Status (1)

Country Link
JP (1) JPS56123557A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58136059A (en) * 1982-02-08 1983-08-12 Fuji Xerox Co Ltd Speed controller of copying machine
JPS61261754A (en) * 1985-05-16 1986-11-19 Shinko Electric Co Ltd Image forming device
JPH0271869U (en) * 1988-11-17 1990-05-31

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5026973A (en) * 1973-07-13 1975-03-20
JPS54153943U (en) * 1978-04-18 1979-10-26

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5026973A (en) * 1973-07-13 1975-03-20
JPS54153943U (en) * 1978-04-18 1979-10-26

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58136059A (en) * 1982-02-08 1983-08-12 Fuji Xerox Co Ltd Speed controller of copying machine
JPS61261754A (en) * 1985-05-16 1986-11-19 Shinko Electric Co Ltd Image forming device
JPH0271869U (en) * 1988-11-17 1990-05-31

Also Published As

Publication number Publication date
JPS6365935B2 (en) 1988-12-19

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