US3832524A - Heating unit for copying machine - Google Patents

Heating unit for copying machine Download PDF

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Publication number
US3832524A
US3832524A US00387311A US38731173A US3832524A US 3832524 A US3832524 A US 3832524A US 00387311 A US00387311 A US 00387311A US 38731173 A US38731173 A US 38731173A US 3832524 A US3832524 A US 3832524A
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US
United States
Prior art keywords
pair
heating element
terminals
central
voltage source
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.)
Expired - Lifetime
Application number
US00387311A
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English (en)
Inventor
K Takiguchi
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.)
Fujifilm Business Innovation Corp
Original Assignee
Fuji Xerox 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 Fuji Xerox Co Ltd filed Critical Fuji Xerox Co Ltd
Application granted granted Critical
Publication of US3832524A publication Critical patent/US3832524A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • G03G15/20—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat
    • G03G15/2003—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat
    • G03G15/2007—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat using radiant heat, e.g. infrared lamps, microwave heaters
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03D—APPARATUS FOR PROCESSING EXPOSED PHOTOGRAPHIC MATERIALS; ACCESSORIES THEREFOR
    • G03D13/00—Processing apparatus or accessories therefor, not covered by groups G11B3/00 - G11B11/00
    • G03D13/002—Heat development apparatus, e.g. Kalvar
    • 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
    • G03G15/20—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat
    • G03G15/2003—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat

Definitions

  • thermo-developing diazo-type copying machine there is provided a heating unit of a capacity adjusted to the size of the largest possible copying paper usable in a particular copying machine. Therefore, when copy paper of a size smaller than the maximum usable copy paper is used, the heating section becomes wider than necessary for heating, thus wasting electric power consumption. Also, the temperature toward the sides of the copy paper becomes lower than that in the central portion to thereby prevent uniform heating over the entire surface of the copy paper.
  • the primary object of this invention is to provide an improved heating unit for use in a copying machine, whereby it is possible to change the heat-generating length according to the size of the copy paper used.
  • FIG. 1 is a diagrammatic illustration of an illustrative heating unit in accordance with the invention.
  • FIG. 2 is a schematic circuit diagram of illustrative circuitry incorporating the heating unit of FIG. 1.
  • FIG. 1 there is shown a central heating element 1 which is connected at its both ends to low resistance conductors 2 and 2" which are disposed in respective insulating tubes 3 and 3' provided on both sides of the central heating element 1. Coiled around the insulating tubes 3 and 3' are end heating elements ..4 and 4', each of which is connected at one end to the corresponding end of central heating element 1.
  • the heating unit of FIG. I is connected to a constant voltage, electric power source 5 and to a double-throw switch 6 comprising movable contacts 6 and 6 and fixed contacts 6 and 6
  • the outer ends of the'low resistance conductors 2 and 2' together with contacts 6, and 6 are connected to power source 5, while the outer end of heating element 4 is connected to contact element 6 and outer end of heating element 4' is connected to the contact element 6
  • the switch 6 is opened (see FIG. 2), voltage from the power source 5 is applied only to the central heating element I so that the heating length is limited to the length of element 1 alone.
  • the amount of heat generated in the end'portions of the copying paper may be made greater than that in the central portion by changing the resistance per unit length of the central and end heating elements 1, 4, and 4' to thereby prevent temperature decrease in the end portions to hence facilitate uniform heating over the entire surface of the copying paper.
  • the present device is capable of varying the heating length according to the size of copy paper used, so that it is possible to economize on power consumption when copying on copy paper smaller than the maximum permissible copying width. Further, if the colorific values of the respective heating elements are suitably set, it becomes possible to perform uniform heating over the entirety of the copy paper thereby facilitating clearer reproductions.
  • Circuitry including a heating unit for use ina copying machine capable of copying on copy' papers of at least two different widths comprising:
  • a voltage source connected across said first pair of terminals and switching means connected to said first and second pairs of terminals for: (1) connecting said central and two end heating elements in parallel across said voltage source when said larger width copy paper is used, and (2) disconnecting said two end heating elements from said voltage source when .said smaller width copy paper is used to thereby optimize power consumption from said voltage source.
  • a double-throw switch having two fixed contacts and two movable contacts which respectively contact the two fixed contacts when the switch is closed
  • the first of said movable contacts being connected to ement connected to said one terminal of the second pair is connected in parallel across said central heating element
  • the second of said fixed contacts being connected to the other terminal of said second pair of terminals
  • the second of said movable contacts being connected to the other terminal of said first pair of terminals so that when said second movable contact contacts said second fixed contact, the end heating element connected to said other terminal of the second pair is connected in parallel across said central heatingelement.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Fixing For Electrophotography (AREA)
  • Resistance Heating (AREA)
US00387311A 1972-08-23 1973-08-10 Heating unit for copying machine Expired - Lifetime US3832524A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1972097663U JPS5350444Y2 (enrdf_load_stackoverflow) 1972-08-23 1972-08-23

Publications (1)

Publication Number Publication Date
US3832524A true US3832524A (en) 1974-08-27

Family

ID=14198284

Family Applications (1)

Application Number Title Priority Date Filing Date
US00387311A Expired - Lifetime US3832524A (en) 1972-08-23 1973-08-10 Heating unit for copying machine

Country Status (3)

Country Link
US (1) US3832524A (enrdf_load_stackoverflow)
JP (1) JPS5350444Y2 (enrdf_load_stackoverflow)
GB (1) GB1394047A (enrdf_load_stackoverflow)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4001545A (en) * 1974-06-15 1977-01-04 Minolta Camera Kabushiki Kaisha Devices for controlling the heating of fuser roll apparatus
US4318612A (en) * 1980-07-10 1982-03-09 International Business Machines Corporation Hot roll fuser temperature control
EP0076652A1 (en) * 1981-09-30 1983-04-13 Xerox Corporation Fusing apparatus
US4585325A (en) * 1983-03-16 1986-04-29 Hoechst Aktiengesellschaft Fixing roller device
US4618240A (en) * 1982-03-16 1986-10-21 Canon Kabushiki Kaisha Heating device having a heat insulating roller
EP0089176B1 (en) * 1982-03-25 1988-06-29 GTE Products Corporation Tubular incandescent lamp
US5171969A (en) * 1989-10-30 1992-12-15 Canon Kabushiki Kaisha Movable film fixing device with heater control responsive to selected sheet size
US5204723A (en) * 1990-11-02 1993-04-20 Canon Kabushiki Kaisha Heating apparatus having heater with branch
US5331384A (en) * 1989-01-25 1994-07-19 Canon Kabushiki Kaisha Fixing apparatus having temperature controller which controls temperature according to width size and number of recording sheets
US5350896A (en) * 1993-11-22 1994-09-27 Xerox Corporation Dual lamp fuser
US5497218A (en) * 1994-08-24 1996-03-05 Xerox Corporation Three point thermistor temperature set up
US5521689A (en) * 1994-09-12 1996-05-28 Fujitsu Limited Image forming apparatus with flash fixing
US6452135B1 (en) * 2001-05-01 2002-09-17 Johnson, Iii Joe P. Heating unit with selectively energized heating modules
US9182364B1 (en) * 2012-10-10 2015-11-10 U.S. Department Of Energy Hot wire needle probe for thermal conductivity detection

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3148269A (en) * 1962-08-22 1964-09-08 Hoover Ball & Bearing Co Heater for continuous molding machine

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3148269A (en) * 1962-08-22 1964-09-08 Hoover Ball & Bearing Co Heater for continuous molding machine

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4001545A (en) * 1974-06-15 1977-01-04 Minolta Camera Kabushiki Kaisha Devices for controlling the heating of fuser roll apparatus
US4318612A (en) * 1980-07-10 1982-03-09 International Business Machines Corporation Hot roll fuser temperature control
EP0076652A1 (en) * 1981-09-30 1983-04-13 Xerox Corporation Fusing apparatus
JPS5868773A (ja) * 1981-09-30 1983-04-23 ゼロツクス・コ−ポレ−シヨン 定着装置及び電子写真印刷機
US4434353A (en) 1981-09-30 1984-02-28 Xerox Corporation Fusing system
US4618240A (en) * 1982-03-16 1986-10-21 Canon Kabushiki Kaisha Heating device having a heat insulating roller
EP0089176B1 (en) * 1982-03-25 1988-06-29 GTE Products Corporation Tubular incandescent lamp
US4585325A (en) * 1983-03-16 1986-04-29 Hoechst Aktiengesellschaft Fixing roller device
US5331384A (en) * 1989-01-25 1994-07-19 Canon Kabushiki Kaisha Fixing apparatus having temperature controller which controls temperature according to width size and number of recording sheets
US5171969A (en) * 1989-10-30 1992-12-15 Canon Kabushiki Kaisha Movable film fixing device with heater control responsive to selected sheet size
US5204723A (en) * 1990-11-02 1993-04-20 Canon Kabushiki Kaisha Heating apparatus having heater with branch
US5350896A (en) * 1993-11-22 1994-09-27 Xerox Corporation Dual lamp fuser
US5497218A (en) * 1994-08-24 1996-03-05 Xerox Corporation Three point thermistor temperature set up
US5521689A (en) * 1994-09-12 1996-05-28 Fujitsu Limited Image forming apparatus with flash fixing
US6452135B1 (en) * 2001-05-01 2002-09-17 Johnson, Iii Joe P. Heating unit with selectively energized heating modules
US9182364B1 (en) * 2012-10-10 2015-11-10 U.S. Department Of Energy Hot wire needle probe for thermal conductivity detection

Also Published As

Publication number Publication date
GB1394047A (en) 1975-05-14
DE2342360B2 (de) 1976-09-09
DE2342360A1 (de) 1974-03-14
JPS4955054U (enrdf_load_stackoverflow) 1974-05-15
JPS5350444Y2 (enrdf_load_stackoverflow) 1978-12-02

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