JPS575065A - Developing device - Google Patents

Developing device

Info

Publication number
JPS575065A
JPS575065A JP7881780A JP7881780A JPS575065A JP S575065 A JPS575065 A JP S575065A JP 7881780 A JP7881780 A JP 7881780A JP 7881780 A JP7881780 A JP 7881780A JP S575065 A JPS575065 A JP S575065A
Authority
JP
Japan
Prior art keywords
width
roller
bias
unicomponent
recording sheet
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
JP7881780A
Other languages
Japanese (ja)
Inventor
Takaharu Goto
Keitaro Yamashita
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.)
Proterial Ltd
Original Assignee
Hitachi Metals 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 Hitachi Metals Ltd filed Critical Hitachi Metals Ltd
Priority to JP7881780A priority Critical patent/JPS575065A/en
Publication of JPS575065A publication Critical patent/JPS575065A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
    • G03G15/065—Arrangements for controlling the potential of the developing electrode

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Magnetic Brush Developing In Electrophotography (AREA)
  • Developing For Electrophotography (AREA)
  • Control Or Security For Electrophotography (AREA)

Abstract

PURPOSE:To control the width of bias application according to the width of a recording sheet, by detecting the width of the recording sheet when a reverse development is carried out with a unicomponent magnetic toner and an application of bias. CONSTITUTION:The bias voltage is applied between a conductive sleeve 3 and a metallic guide roller 6' of a developing device using a unicomponent magnetic toner. Thus a reverse development is carried out. Grooves 9 are provided to the roller 6' in longitudinal direction with a prescribed space. The guide rollers 6a' and 6b' are electrically insulated from each other by an insulating material 11, and a microswitch 10 or a photosensor is provided to the groove 9 between the rollers 6a' and 6b'. The roller parts 6a' and 6b' are set to the sizes corresponding to the B4 and A4 sizes respectively. Thus when the A4-sized paper passes, a switch works to give the grounding to both parts 6a' and 6b'. While only the part 6a' is grounded when the B4-sized paper passes.
JP7881780A 1980-06-11 1980-06-11 Developing device Pending JPS575065A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7881780A JPS575065A (en) 1980-06-11 1980-06-11 Developing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7881780A JPS575065A (en) 1980-06-11 1980-06-11 Developing device

Publications (1)

Publication Number Publication Date
JPS575065A true JPS575065A (en) 1982-01-11

Family

ID=13672387

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7881780A Pending JPS575065A (en) 1980-06-11 1980-06-11 Developing device

Country Status (1)

Country Link
JP (1) JPS575065A (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS494532A (en) * 1972-03-15 1974-01-16
JPS4990943A (en) * 1972-12-28 1974-08-30
JPS5484738A (en) * 1977-12-19 1979-07-05 Ricoh Co Ltd Developing device for variable magnification copier

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS494532A (en) * 1972-03-15 1974-01-16
JPS4990943A (en) * 1972-12-28 1974-08-30
JPS5484738A (en) * 1977-12-19 1979-07-05 Ricoh Co Ltd Developing device for variable magnification copier

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