JPS5566437A - Paper jam detecting system - Google Patents

Paper jam detecting system

Info

Publication number
JPS5566437A
JPS5566437A JP13821378A JP13821378A JPS5566437A JP S5566437 A JPS5566437 A JP S5566437A JP 13821378 A JP13821378 A JP 13821378A JP 13821378 A JP13821378 A JP 13821378A JP S5566437 A JPS5566437 A JP S5566437A
Authority
JP
Japan
Prior art keywords
jam
differential
paper
detectors
outputs
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
JP13821378A
Other languages
Japanese (ja)
Inventor
Toshio Ebinaka
Kazuhisa Aikawa
Masakatsu Horie
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP13821378A priority Critical patent/JPS5566437A/en
Publication of JPS5566437A publication Critical patent/JPS5566437A/en
Pending legal-status Critical Current

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Abstract

PURPOSE: To detect a paper jam promptly, by measuring correlation between detecting signals transmitted from recording paper feed perforation detectors located at the conveying passage.
CONSTITUTION: Two feed perforation detectors 2 and 3 are situated at the conveying passage of a recording paper 1 conveyed by means of tractors 4 and 5. The outputs of the detectors 2 and 3 are fed to wave-form shaping circuits 7 and 8, respectively, wherefrom signals having a period equivalent to a distance between the feed perforations are put out. The outputs are inputted to a differential device 11 via F-V conversion circuits 9 and 10, the differential voltages being detected. The differential voltages are compared with the threshold voltage established at a voltage comparision circuit 12, a jam signal being put out when the differential voltage exceeds the threshold voltage. This permits the reliable detection of the jam as a result of the difference in and the pulsation of a conveying speed of the paper being cancelled.
COPYRIGHT: (C)1980,JPO&Japio
JP13821378A 1978-11-09 1978-11-09 Paper jam detecting system Pending JPS5566437A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13821378A JPS5566437A (en) 1978-11-09 1978-11-09 Paper jam detecting system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13821378A JPS5566437A (en) 1978-11-09 1978-11-09 Paper jam detecting system

Publications (1)

Publication Number Publication Date
JPS5566437A true JPS5566437A (en) 1980-05-19

Family

ID=15216716

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13821378A Pending JPS5566437A (en) 1978-11-09 1978-11-09 Paper jam detecting system

Country Status (1)

Country Link
JP (1) JPS5566437A (en)

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