JPS5616147A - Sheet existence detecting unit of copying - Google Patents

Sheet existence detecting unit of copying

Info

Publication number
JPS5616147A
JPS5616147A JP7755880A JP7755880A JPS5616147A JP S5616147 A JPS5616147 A JP S5616147A JP 7755880 A JP7755880 A JP 7755880A JP 7755880 A JP7755880 A JP 7755880A JP S5616147 A JPS5616147 A JP S5616147A
Authority
JP
Japan
Prior art keywords
light source
source lamp
constitution
copying
detecting unit
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
JP7755880A
Other languages
Japanese (ja)
Inventor
Nobuyuki Yanagawa
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 JP7755880A priority Critical patent/JPS5616147A/en
Publication of JPS5616147A publication Critical patent/JPS5616147A/en
Pending legal-status Critical Current

Links

Landscapes

  • Paper Feeding For Electrophotography (AREA)

Abstract

PURPOSE: To reduce the number of parts to simplify constitution and simplify wiring of lead wires, by detecting by one light source and the first and the second photodetectors whether a copy sheet to exist in the upper side and a copy sheet to exist in the lower side are present or absent.
CONSTITUTION: One light source lamp 71 is arranged between paper supply cassettes 5 and 6, and the light path toward the first photodetector 72 and the second photodetector 73 is formed from light source lamp 71. Light source lamp 71 and photodetectors 72 and 73 detect that copy sheets in cassettes 5 and 6 have run out and achieve the function to display paper absence on the operation part of the copying unit. Thus, the number of parts is reduced because only one light source lamp is required, and constitution and wiring of lead wires are simplified. Consequently, the unit can be low-cost.
COPYRIGHT: (C)1981,JPO&Japio
JP7755880A 1980-06-09 1980-06-09 Sheet existence detecting unit of copying Pending JPS5616147A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7755880A JPS5616147A (en) 1980-06-09 1980-06-09 Sheet existence detecting unit of copying

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7755880A JPS5616147A (en) 1980-06-09 1980-06-09 Sheet existence detecting unit of copying

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
JP2800979A Division JPS55120065A (en) 1979-03-09 1979-03-09 Electrophotographic copier

Publications (1)

Publication Number Publication Date
JPS5616147A true JPS5616147A (en) 1981-02-16

Family

ID=13637337

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7755880A Pending JPS5616147A (en) 1980-06-09 1980-06-09 Sheet existence detecting unit of copying

Country Status (1)

Country Link
JP (1) JPS5616147A (en)

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