EP0604377A2 - Bilderzeugungsvorrichtung mit einem Mechanismus zur Verhinderung von Taubildung - Google Patents

Bilderzeugungsvorrichtung mit einem Mechanismus zur Verhinderung von Taubildung Download PDF

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Publication number
EP0604377A2
EP0604377A2 EP93830514A EP93830514A EP0604377A2 EP 0604377 A2 EP0604377 A2 EP 0604377A2 EP 93830514 A EP93830514 A EP 93830514A EP 93830514 A EP93830514 A EP 93830514A EP 0604377 A2 EP0604377 A2 EP 0604377A2
Authority
EP
European Patent Office
Prior art keywords
image forming
forming apparatus
hour
heat generating
generating means
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.)
Granted
Application number
EP93830514A
Other languages
English (en)
French (fr)
Other versions
EP0604377B1 (de
EP0604377A3 (de
Inventor
Michiro C/O Canon Kabushiki Kaisha Koike
Hiroshi C/O Canon Kabushiki Kaisha Ogawa
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
Publication of EP0604377A2 publication Critical patent/EP0604377A2/de
Publication of EP0604377A3 publication Critical patent/EP0604377A3/de
Application granted granted Critical
Publication of EP0604377B1 publication Critical patent/EP0604377B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • G03G15/50—Machine control of apparatus for electrographic processes using a charge pattern, e.g. regulating differents parts of the machine, multimode copiers, microprocessor control
    • G03G15/5004—Power supply control, e.g. power-saving mode, automatic power turn-off
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J29/00—Details of, or accessories for, typewriters or selective printing mechanisms not otherwise provided for
    • B41J29/377—Cooling or ventilating arrangements
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G21/00—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge
    • G03G21/20—Humidity or temperature control also ozone evacuation; Internal apparatus environment control
    • G03G21/203—Humidity

Definitions

  • the present invention relates to an image forming apparatus utilizing the electrostatic transfer process, such as an electrostatic copying machine, an electrophotographic printer and the like.
  • An object of the present invention is to reduce the electric power consumption by disconnecting or interrupting a power source from a dew preventing heater means when an image forming apparatus is not being used.
  • the other object of the present invention is to facilitate the operation for saving the electric power.
  • the present invention provides an image forming apparatus having a dew preventing mechanism, comprising an electorphotographic photosensitive member, heat generating means for applying heat to the photosensitive member, control means for controlling the operation of the heating means, and an operation panel for setting the operations of the control means and the image forming apparatus.
  • the present invention is characterized by that the initiation of the operation of the heating means is determined by the operation panel and, after a power source of the image forming apparatus is turned OFF, the electric power to the heating means is stopped.
  • Fig. 1 shows an internal construction of a microprocessor unit for controlling a copying apparatus according to the present invention.
  • the microprocessor unit (MPU) 50 includes an operating portion (CPU) 51 having calculation and judgement functions, a treatment program storing read only memory (ROM) 52, a data storing random access memory (RAM) 53, and input and output ports for sending and receiving signals with respect to external devices. Further, a timer IC 54 is incorporated in the MPU 50 so that the timer can be set by command. Since the fundamental operation of the MPU 50 is already known, the explanation thereof will be omitted.
  • Fig. 2 shows a flow chart for general copying machines.
  • the initialization such as main switch ON reset and the setting of an operation mode of the MPU 50, and then the initial check routine is carried out.
  • this initial check routine first of all, the presence/absence of toner, a transfer sheet and the like is checked, and then, if a mirror support and a sheet supply deck are not positioned in a predetermined condition, the mirror support and the sheet supply deck are set to the initial condition by driving motors, clutches and the like.
  • a waiting condition is continued until the fixing means reaches a predetermined temperature, and, by detecting the temperature and humidity, a voltage applied to a charge means and bias potential for a photosensitive member are set.
  • the number of copy sheets and a copy mode are set, and, when a start switch is turned ON, a copy process including the known charging, exposure, transferring, electricity removal and fixing is performed, during which the abnormity in the copy sequence control, sheet jam, opening/closing of a safety switch and the like are always checked.
  • the copy process is completed, the counter date is checked.
  • the program is returend to the initial check routine for preparing for the next copy start.
  • the operation of heat devices for the photosensitive drum and mirrors, lens and the like are controlled by the CPU 51 and the program timer 54. That is to say, as the heat devices, a cylindrical face-shaped heater mounted in the photosensitive drum and a cement resistor arranged in the proximity of the mirrors and lens are used and are appropriately arranged.
  • the photosensitive drum 3 comprises a cylinder 10, left and right flanges 12L, 12R secured to both ends of the cylinder 10 and interconnected by an inner stay 11, and left and right bearings 15L, 15R attached to left and right shafts 13L, 13R protruded from the flanges 12L, 12R, and is rotatably supported by a process unit by fitting the bearings 15L, 15R into left and right support plates 6L, 6R of a case 2 of the process unit.
  • a face-shaped heater 16 is arranged along an inner peripheral surface of the cylinder 10 of the photosensitive drum 3, and a temperature control substrate 17 which receives the electric power via an electrode 19 is connected to the face-shaped heater 16.
  • Sliding end portions 19a, 19b protruded from the electrode 19 are slidingly contacted with two rings 7a, 7b of a slip ring 7 (Figs. 6A and 6B) secured to the process unit so that the electric power can be applied to the heater 16 even when the photosensitive drum 3 is being rotated.
  • an operation panel portion of the copying apparatus is provided with various set keys (as in the conventional copying machine), a timer set key 95 for setting a time period so that the heat device is turned ON again after a predetermined time period (t1) from OFF of the main switch is elapsed, a seven segment display device 72 capable of displaying a numeral value and English characters and adapted to display a timer set time, as well as the number of copy sheets (as in the conventional copying machine), and up and down keys 96, 97 for altering and/or designating the timer set value and the like.
  • the MPU 50 sends the command to the program timer IC 54, thereby setting the timer function.
  • Fig. 3 is a timing chart showing the operation timing of the copying apparatus as mentioned above.
  • the operator sets a time period to be elapsed from the present hour by using the operation panel so that the heat device is turned ON before a predetermined time period (t2 in Fig. 3) from the next starting hour (for example, tomorrow), i.e., an appropriate time period more than a time period during which the dew (if generated) in the copying apparatus is disappeared by the heat device.
  • a predetermined time period t2 in Fig. 3
  • the MPU receives the signal from the timer and emits the control signal to supply the electric power to the heat device again.
  • the heat device for the photosensitive drum can be turned OFF, unlike to the conventional copying machines.
  • the saving of energy is greatly improved, and the high safety is ensured since the heat device is not being operated under no monitor.
  • the timer can be set by previously inputting the next starting hour to the operation portion by the operator before the main switch is turned OFF in the closing hour.
  • a time difference between the starting hour inputted by the operator and the instant hour when the starting hour is inputted is calculated.
  • the operator since the initiation of the operation of the heat device can be inputted as the hour, unlike to the first embodiment, the operator does not set the timer in consideration of the time period from when the heat device is turned ON to when the dew is disappeared and the time difference between the closing hour and the starting hour, thus improving the operability.
  • the heater for removing the humidity and preventing the dew is turned OFF substantially at the same time when the main switch of the image forming apparatus is turned OFF and the operation key for setting the hour for starting the operation of the heater is provided and further the heater is controlled to be turned ON again after the predetermined time period by the operation key, it is possible to provide the image forming apparatus in which the useless electric power for driving the heater in the midnight can be avoided and which has the high safety.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Atmospheric Sciences (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Ecology (AREA)
  • Environmental & Geological Engineering (AREA)
  • Environmental Sciences (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Control Or Security For Electrophotography (AREA)
  • Accessory Devices And Overall Control Thereof (AREA)
EP19930830514 1992-12-25 1993-12-21 Bilderzeugungsvorrichtung mit einem Mechanismus zur Verhinderung von Taubildung Expired - Lifetime EP0604377B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP4346713A JPH06194902A (ja) 1992-12-25 1992-12-25 画像形成装置
JP346713/92 1992-12-25

Publications (3)

Publication Number Publication Date
EP0604377A2 true EP0604377A2 (de) 1994-06-29
EP0604377A3 EP0604377A3 (de) 1995-02-08
EP0604377B1 EP0604377B1 (de) 1999-05-26

Family

ID=18385312

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19930830514 Expired - Lifetime EP0604377B1 (de) 1992-12-25 1993-12-21 Bilderzeugungsvorrichtung mit einem Mechanismus zur Verhinderung von Taubildung

Country Status (3)

Country Link
EP (1) EP0604377B1 (de)
JP (1) JPH06194902A (de)
DE (1) DE69325084T2 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2334232A (en) * 1998-02-17 1999-08-18 Hewlett Packard Co Heated air circulation in copiers

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5521020A (en) * 1978-08-01 1980-02-14 Ricoh Co Ltd Heater control circuit in copying machine
JPS578552A (en) * 1980-06-19 1982-01-16 Canon Inc Image forming apparatus
JPS57168262A (en) * 1981-04-09 1982-10-16 Canon Inc Electrophotographic copying machine control system
JPS6163860A (ja) * 1984-09-04 1986-04-02 Fuji Xerox Co Ltd 複写機の結露防止装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5521020A (en) * 1978-08-01 1980-02-14 Ricoh Co Ltd Heater control circuit in copying machine
JPS578552A (en) * 1980-06-19 1982-01-16 Canon Inc Image forming apparatus
JPS57168262A (en) * 1981-04-09 1982-10-16 Canon Inc Electrophotographic copying machine control system
JPS6163860A (ja) * 1984-09-04 1986-04-02 Fuji Xerox Co Ltd 複写機の結露防止装置

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 10, no. 229 (P-485) 8 August 1986 & JP-A-61 063 860 (FUJI) 2 April 1986 *
PATENT ABSTRACTS OF JAPAN vol. 4, no. 51 (P-007) 17 April 1980 & JP-A-55 021 020 (RICOH) 14 February 1980 *
PATENT ABSTRACTS OF JAPAN vol. 6, no. 70 (P-113) 6 May 1982 & JP-A-57 008 552 (CANON) 16 January 1982 *
PATENT ABSTRACTS OF JAPAN vol. 7, no. 10 (P-168) 14 January 1983 & JP-A-57 168 262 (CANON) 16 October 1982 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2334232A (en) * 1998-02-17 1999-08-18 Hewlett Packard Co Heated air circulation in copiers

Also Published As

Publication number Publication date
DE69325084T2 (de) 1999-11-18
EP0604377B1 (de) 1999-05-26
JPH06194902A (ja) 1994-07-15
DE69325084D1 (de) 1999-07-01
EP0604377A3 (de) 1995-02-08

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