JPS55146457A - Safety device of electrophotographic copier - Google Patents

Safety device of electrophotographic copier

Info

Publication number
JPS55146457A
JPS55146457A JP4543179A JP4543179A JPS55146457A JP S55146457 A JPS55146457 A JP S55146457A JP 4543179 A JP4543179 A JP 4543179A JP 4543179 A JP4543179 A JP 4543179A JP S55146457 A JPS55146457 A JP S55146457A
Authority
JP
Japan
Prior art keywords
pulses
copier
cpu
sequential
continuous signal
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
JP4543179A
Other languages
Japanese (ja)
Inventor
Kazuo Watanabe
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.)
Konica Minolta Inc
Original Assignee
Konica Minolta Inc
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 Konica Minolta Inc filed Critical Konica Minolta Inc
Priority to JP4543179A priority Critical patent/JPS55146457A/en
Priority to DE19803014671 priority patent/DE3014671A1/en
Publication of JPS55146457A publication Critical patent/JPS55146457A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B19/00—Program-control systems
    • G05B19/02—Program-control systems electric
    • G05B19/04—Program control other than numerical control, i.e. in sequence controllers or logic controllers
    • G05B19/042—Program control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
    • G05B19/0428—Safety, monitoring
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/20—Pc systems
    • G05B2219/24—Pc safety
    • G05B2219/24125—Watchdog, check at timed intervals

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Control Or Security For Electrophotography (AREA)
  • Accessory Devices And Overall Control Thereof (AREA)

Abstract

PURPOSE: To prevent misaction of a copier due to external noises in sequential control, by converting pulses continually occurring in accordance with a sequential program into a continuous signal to control stop of the sequence.
CONSTITUTION: When a copier is subjected to sequential control by CPU, CPU generates continual pulses SOD continuing in accordance with the sequential program. On application of these pulses monostable multivibrator OMV produces a continuous signal. When CPU deviates from operations due to the program, because of misoperation due to external noises, occurrence of partial troubles, etc., pulses SOD are not generated, the continuous signal from multivibrator OMV is interrupted, an operation signal output port is reset, and the copying sequence stops, thus, permitting the sequentially controlled copier not to misoperate because of external noises, troubles, etc..
COPYRIGHT: (C)1980,JPO&Japio
JP4543179A 1979-04-16 1979-04-16 Safety device of electrophotographic copier Pending JPS55146457A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP4543179A JPS55146457A (en) 1979-04-16 1979-04-16 Safety device of electrophotographic copier
DE19803014671 DE3014671A1 (en) 1979-04-16 1980-04-16 Safety arrangement for appts. using micro-data-processor - has converter circuit delivering continuous signal from pulse signals received from central processing circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4543179A JPS55146457A (en) 1979-04-16 1979-04-16 Safety device of electrophotographic copier

Publications (1)

Publication Number Publication Date
JPS55146457A true JPS55146457A (en) 1980-11-14

Family

ID=12719101

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4543179A Pending JPS55146457A (en) 1979-04-16 1979-04-16 Safety device of electrophotographic copier

Country Status (2)

Country Link
JP (1) JPS55146457A (en)
DE (1) DE3014671A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5068853A (en) * 1988-08-30 1991-11-26 Konica Corporations Fail-safe apparatus for image forming apparatus

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52128133A (en) * 1976-04-21 1977-10-27 Ricoh Co Ltd Detection of abnormal phenomenon of copier sequence

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52128133A (en) * 1976-04-21 1977-10-27 Ricoh Co Ltd Detection of abnormal phenomenon of copier sequence

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5068853A (en) * 1988-08-30 1991-11-26 Konica Corporations Fail-safe apparatus for image forming apparatus

Also Published As

Publication number Publication date
DE3014671A1 (en) 1980-10-30
DE3014671C2 (en) 1990-05-17

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