JPS55164866A - Image forming device - Google Patents

Image forming device

Info

Publication number
JPS55164866A
JPS55164866A JP7261679A JP7261679A JPS55164866A JP S55164866 A JPS55164866 A JP S55164866A JP 7261679 A JP7261679 A JP 7261679A JP 7261679 A JP7261679 A JP 7261679A JP S55164866 A JPS55164866 A JP S55164866A
Authority
JP
Japan
Prior art keywords
disconnection
becomes
time
detection
thermistor
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
JP7261679A
Other languages
Japanese (ja)
Inventor
Tsuneki Inutsuka
Yoshitaka Kawamo
Masahito Ishida
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.)
Canon Inc
Original Assignee
Canon 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 Canon Inc filed Critical Canon Inc
Priority to JP7261679A priority Critical patent/JPS55164866A/en
Publication of JPS55164866A publication Critical patent/JPS55164866A/en
Pending legal-status Critical Current

Links

Landscapes

  • Fixing For Electrophotography (AREA)
  • Control Or Security For Electrophotography (AREA)

Abstract

PURPOSE: To make possible accurate detection of the disconnection of a temperature detecting element with a simple constitution even when the copying machine is in a low-temeprature state by inhibiting the operation of a disconnection detecting circuit for a fixed time for the beginning of starting of heating the material to be heated such as roller and making its detection possible after a fixed time.
CONSTITUTION: Upon turning on of a main switch, electric power is supplied to a heater H21, and the resistance value of the thermistor TH21 decreases gradually. At the same time, C21 for timer for inhibiting the detection of disconnection is charged. The output of an operational amplifier Q21 is H. When the voltage of the C21 has been sufficiently charged, the Q21 becomes L at the time of t1 and causes the disconnection detecting circuit to operate. If the thermistor TH21 becomes lower than the preset resistance value when there is no disconnection, WAIT becomes H at the time of t2. If there is a disconnection, the base of Q25 becomes H at the time of t1 and the anode of D27 becomes L, by which the electric power to H21 is cut off like the dotted line and the WAIT signal is held L, thus the copying start is inhibited. In this way, the disconnection of the temperature detecting element may be accurately detected by the simple constitution even in a low-temperature state.
COPYRIGHT: (C)1980,JPO&Japio
JP7261679A 1979-06-08 1979-06-08 Image forming device Pending JPS55164866A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7261679A JPS55164866A (en) 1979-06-08 1979-06-08 Image forming device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7261679A JPS55164866A (en) 1979-06-08 1979-06-08 Image forming device

Publications (1)

Publication Number Publication Date
JPS55164866A true JPS55164866A (en) 1980-12-22

Family

ID=13494484

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7261679A Pending JPS55164866A (en) 1979-06-08 1979-06-08 Image forming device

Country Status (1)

Country Link
JP (1) JPS55164866A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6170556A (en) * 1984-09-14 1986-04-11 Copal Co Ltd Automatic developing machine

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4862472A (en) * 1971-12-02 1973-08-31
JPS4916148U (en) * 1972-05-13 1974-02-09

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4862472A (en) * 1971-12-02 1973-08-31
JPS4916148U (en) * 1972-05-13 1974-02-09

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6170556A (en) * 1984-09-14 1986-04-11 Copal Co Ltd Automatic developing machine

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