EP0071969A2 - A fixation apparatus for an electrostatic photographic copying machine - Google Patents

A fixation apparatus for an electrostatic photographic copying machine Download PDF

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Publication number
EP0071969A2
EP0071969A2 EP82107016A EP82107016A EP0071969A2 EP 0071969 A2 EP0071969 A2 EP 0071969A2 EP 82107016 A EP82107016 A EP 82107016A EP 82107016 A EP82107016 A EP 82107016A EP 0071969 A2 EP0071969 A2 EP 0071969A2
Authority
EP
European Patent Office
Prior art keywords
heating roller
gear
copying machine
heat resistant
fixation apparatus
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.)
Withdrawn
Application number
EP82107016A
Other languages
German (de)
French (fr)
Other versions
EP0071969A3 (en
Inventor
Masahiro Murakami
Masahiro Yoshioka
Eiji Tsutsui
Noriyuki Iwao
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.)
Kyocera Mita Industrial Co Ltd
Original Assignee
Mita Industrial 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 Mita Industrial Co Ltd filed Critical Mita Industrial Co Ltd
Publication of EP0071969A2 publication Critical patent/EP0071969A2/en
Publication of EP0071969A3 publication Critical patent/EP0071969A3/en
Withdrawn legal-status Critical Current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
    • G03G15/2014—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat using contact heat
    • G03G15/2053—Structural details of heat elements, e.g. structure of roller or belt, eddy current, induction heating

Definitions

  • the present invention relates to a fixation apparatus for an electrostatic photographic copying machine comprising a heating roller provided with a heater, a bearing for rotatably supporting said heating roller, a heating bush arranged between said bearing and said heating roller, and a gear or a sprocket for revolving said heating roller fixedly mounted on said roller.
  • FIG. 5 designates a heating roller consisting of a pair of bosses consisting of a left boss (22') and a right boss (23') , a cylindrical body (24') fixedly mounted on said bosses (22', 23') and a coating (25') made of fluorine containing resin such as Teflon (Tr Mark) surrounding said cylindrical body (24') and provide with a heater (26') therein.
  • a heating roller consisting of a pair of bosses consisting of a left boss (22') and a right boss (23') , a cylindrical body (24') fixedly mounted on said bosses (22', 23') and a coating (25') made of fluorine containing resin such as Teflon (Tr Mark) surrounding said cylindrical body (24') and provide with a heater (26') therein.
  • Said left boss (22') and rigL boss (23') are provided with a heat resistant bush (29', 29') by means of a stopper ring (28', 28'), respectivel said heating roller (13') being rotatably supported on a left side plate (18') and a right side plate (19') by means of a pair of flange bearings consisting of a left flange bearing (30') and a right flange bearing (34') put on said heat resistant bushes (29', 29') .
  • a gear (27') for driving said heating roller (13') (although a sprocket may be used, only the cases of a gear will be described hereinafter) is fixedly mounted on the outer end of said boss (23 ' ) by means of a bolt (33') engaging with a notch (32') formed in said boss (23').
  • the conventional gear of this type has the defect that comparatively large noises are developed when rotating in an engagement with a gear not described in the drawing since said gear (27') is fabricated from sintered alloys owing to mechanical strength and heat resistance required for gears.
  • the fixation apparatus for an electrostatic photographic copying machine comprising a heating roller provided with a heater, a bearing for rotatably supporting said heating roller, a heating bush arranged between said bearing and said heating roller, and a gear or a sprocket for revolving said heating roller fixedly mounted on said roller which is characterized in that said heat resistant bush (31) and said gear (27) or sprocket are formed integrally from a resin material having a lower coefficient of thermal conductivity, an excellent heat resistance and the mechanical strength required for gears.
  • said resin materials are a polyamide resin or a polyimide resin.
  • FIG. 1 shows the outline of the construction of an electrostatic photographic copying machine provided with a fixation f apparatus (1) according to the present invention.
  • a charging apparatus (3), an exposure apparatus (4), a development apparatus (5), a transfer apparatus (6) and a cleaning apparatus (7) are arranged in the circumference of a rotary drum (2) the outer circumference of which is covered with a light-sensitive material.
  • Paper-supplying apparatus (8), (9), a paper-transfer roller (10), said fixation apparatus (1) and a paper-discharging apparatus (11) are arranged in from and rear of said transfer apparatus (6) to form a copying paper-transfer course (12).
  • FIGS. 2 to 4 show a fixation apparatus (1) according to the present invention in detail.
  • a pressing roller (14) which is covered with heat resistant rubber along the outer circumference thereof, is placed under said heating rolle " (13), said pressing roller (14) being rotatably supported by means of a pair of supporting members consisting of a left supporting member (15) and a right supporting member (16).
  • Said both supporting members (15,16) are swingably pivoted on side plates (18 , 19) by means of a shaft (17) projectedly mounted on one end thereof, elastically energized toward said heating roller (13) by means of springs (20 , 21) extending from another end thereof to said side plates (18,19) and thereby said pressing roller (14) being engaged with said heating roller (13) to press said pressing roller (14) onto said heating roller (13).
  • Said heating roller (13) itself consists of a pair of bosses consisting of a left boss (22) and a right boss (23) made of stainless steel, a cylindrical body (24) made of for example aluminium fixedly mounted on said bosses (22), (23) and a coating (25) made of fluorine containing resin such as Teflon (Trade Mark) surrounding said cylindrical body (24) and being provided with a heater (26) therein in the same manner as the conventional ones.
  • Said boss (22), which is not provided with a gear (27), is provided with a heat resistant bush (29) onthe outer circumference thereof by means of a stopper ring (28) in the same manner as the conventional ones, a flange bearing (30) being put on said heat resistant bush (19), and said bearing (30) being fixedly mounted on said side plate (18).
  • a heat resistant bush (31) and said gear (27) are put on said boss (23) which is provided with said gear (27), as clearly shown in FIGS.
  • said heat resistant bush (31) is fabricated integrally with said gear (27) and fixedly mounted on said boss (23) by means of a bolt (33) engaging with a notch (32) formed in said boss (23), and a flange bearing (34) put on a heat resistant bush (31) being fixedly mounted on said side plate (19).
  • Said heat resistant bush (31) and said gear (27) are made of various kinds of resin for example a polyamide resin or a polyimide resin (for example "TONI METAL” (Trade Mark) sold by Shinko Sangyo Co., Ltd., Sagamihara, Kanagawa, Japan and "MELDIN” (Trade Mark) sold by The Toyo Bearing Mfg.
  • a heat resistant bush arranged between a bearing and said heating roller and a gear or a sprocket for revolving a heating roller are made of a resin material having a lower coefficient of thermal conductivity, an excellent heat resistance and the mechanical strength required for gears and thereby the rotation of a gear or a sprocket generates remarkably smaller noises as compared with those of the prior art made of sintered alloys, making a quiet operation possible, and the quantity of heat lost through said gear of sprocket being limited to the minimum value which allows for heating said heating roller effectively.
  • said heat resistant bush can be formed integrally with said gear or sprocket for revolving said heating roller since they are made of the same material and thereby the assembly onto said heating roller can be simply and easily achieved by means of at least one assembling means.

Abstract

A reat resistant bush is arranged between a heating roller and a bearing for supporting said heating roller, said heat resistant bush (31) and a gear (27) or sprocket fixedly mounted on said heating roller for revolving said heating roller being formed integrally from resin materials having a lower coefficient of thermal conductivity, an excellent heat resistance and the mechanical strength required for gears.
Remarkably smaller noises are generated, a heating roller being able to be effectively heated, and an assembling operation also being easily achieved.

Description

    BACKGROUND OF THE INVENTION Field of the Invention
  • The present invention relates to a fixation apparatus for an electrostatic photographic copying machine comprising a heating roller provided with a heater, a bearing for rotatably supporting said heating roller, a heating bush arranged between said bearing and said heating roller, and a gear or a sprocket for revolving said heating roller fixedly mounted on said roller.
    • Description of the Prior Art
  • At first, the construction of the conventional fixatic apparatus of this type will be described by reference to FIG. 5. As to FIG. 5, (13') designates a heating roller consisting of a pair of bosses consisting of a left boss (22') and a right boss (23') , a cylindrical body (24') fixedly mounted on said bosses (22', 23') and a coating (25') made of fluorine containing resin such as Teflon (Tr Mark) surrounding said cylindrical body (24') and provide with a heater (26') therein. Said left boss (22') and rigL boss (23')are provided with a heat resistant bush (29', 29') by means of a stopper ring (28', 28'), respectivel said heating roller (13') being rotatably supported on a left side plate (18') and a right side plate (19') by means of a pair of flange bearings consisting of a left flange bearing (30') and a right flange bearing (34') put on said heat resistant bushes (29', 29') . A gear (27') for driving said heating roller (13') (although a sprocket may be used, only the cases of a gear will be described hereinafter) is fixedly mounted on the outer end of said boss (23') by means of a bolt (33') engaging with a notch (32') formed in said boss (23'). The conventional gear of this type has the defect that comparatively large noises are developed when rotating in an engagement with a gear not described in the drawing since said gear (27') is fabricated from sintered alloys owing to mechanical strength and heat resistance required for gears. Further, it has also the defect that the heat of said heating roller (13) heated by said heater (26 ') is lost to the outside since it has a high coefficient of thermal conductivity although it is superior in heat resistance. In addition, it has the defect that said gear (27 ') and said heat resistant bush (29') have to be fixedly mounted on said boss (23') of said heating roller (13') by separate means, for example said gear (27') has to be fixedly mounted by means of said bolt (33') while said heat resistant bush (29') has to be fixedly mounted by means of said stopper ring (28') and thereby the assembling work becomes complicated since said gear (27') and said heat resistant bush (29') are constructed independently.
    • SUMMARY OF THE INVENTION
  • It is an object of the present invention to provide a novel and useful fixation apparatus for an electrostatic photographic copying machine, which can solve the noise problem and the problem of the coefficient of thermal conductivity at a single stroke, making the integration of a gear or sprocket with a heat resistant bush possible, thereby simplifying the assembling work, and eliminating the above described defects incidental to the conventional fixation apparatus by constructing said gear or sprocket from special materials.
  • This object is solved by the fixation apparatus for an electrostatic photographic copying machine according to the invention comprising a heating roller provided with a heater, a bearing for rotatably supporting said heating roller, a heating bush arranged between said bearing and said heating roller, and a gear or a sprocket for revolving said heating roller fixedly mounted on said roller which is characterized in that said heat resistant bush (31) and said gear (27) or sprocket are formed integrally from a resin material having a lower coefficient of thermal conductivity, an excellent heat resistance and the mechanical strength required for gears.
  • According to a preferred embodiment of the invention said resin materials are a polyamide resin or a polyimide resin.
    • BRIEF DESCRIPTION OF THE DRAWINGS
    • FIG. 1 is a sectional view showing the outline of an overall construction of an electrostatic photographic copying machine,
    • FIG. 2 is a perspective view showing a fixation apparatus,
    • FIG. 3 is a sectional view showing a heating roller,
    • FIG. 4 is a disintegrated perspective view showing the main parts of a heating roller, and
    • FIG. 5 is a sectional view showing a heating roller of the conventional construction.
    DESCRIPTION OF THE PREFERRED EMBODIMENT
  • The preferred embodiment of the present invention will be described below making reference to the drawings. FIG. 1 shows the outline of the construction of an electrostatic photographic copying machine provided with a fixation f apparatus (1) according to the present invention. A charging apparatus (3), an exposure apparatus (4), a development apparatus (5), a transfer apparatus (6) and a cleaning apparatus (7) are arranged in the circumference of a rotary drum (2) the outer circumference of which is covered with a light-sensitive material. Paper-supplying apparatus (8), (9), a paper-transfer roller (10), said fixation apparatus (1) and a paper-discharging apparatus (11) are arranged in from and rear of said transfer apparatus (6) to form a copying paper-transfer course (12).
  • FIGS. 2 to 4 show a fixation apparatus (1) according to the present invention in detail. A pressing roller (14), which is covered with heat resistant rubber along the outer circumference thereof, is placed under said heating rolle" (13), said pressing roller (14) being rotatably supported by means of a pair of supporting members consisting of a left supporting member (15) and a right supporting member (16). Said both supporting members (15,16) are swingably pivoted on side plates (18 , 19) by means of a shaft (17) projectedly mounted on one end thereof, elastically energized toward said heating roller (13) by means of springs (20 , 21) extending from another end thereof to said side plates (18,19) and thereby said pressing roller (14) being engaged with said heating roller (13) to press said pressing roller (14) onto said heating roller (13). Said heating roller (13) itself consists of a pair of bosses consisting of a left boss (22) and a right boss (23) made of stainless steel, a cylindrical body (24) made of for example aluminium fixedly mounted on said bosses (22), (23) and a coating (25) made of fluorine containing resin such as Teflon (Trade Mark) surrounding said cylindrical body (24) and being provided with a heater (26) therein in the same manner as the conventional ones. Said boss (22), which is not provided with a gear (27), is provided with a heat resistant bush (29) onthe outer circumference thereof by means of a stopper ring (28) in the same manner as the conventional ones, a flange bearing (30) being put on said heat resistant bush (19), and said bearing (30) being fixedly mounted on said side plate (18). On the contrary, although a heat resistant bush (31) and said gear (27) are put on said boss (23) which is provided with said gear (27), as clearly shown in FIGS. 3, 4, said heat resistant bush (31) is fabricated integrally with said gear (27) and fixedly mounted on said boss (23) by means of a bolt (33) engaging with a notch (32) formed in said boss (23), and a flange bearing (34) put on a heat resistant bush (31) being fixedly mounted on said side plate (19). Said heat resistant bush (31) and said gear (27) are made of various kinds of resin for example a polyamide resin or a polyimide resin (for example "TONI METAL" (Trade Mark) sold by Shinko Sangyo Co., Ltd., Sagamihara, Kanagawa, Japan and "MELDIN" (Trade Mark) sold by The Toyo Bearing Mfg. Co., Ltd., Nishi-ku, Osaka, Japan) having a lower coefficient of thermal conductivity, an excellent heat resistance and the mechanical strength required for gears and thereby said heat resistant bush (31) can be integrally formed with said gear (27), giving full play to the functions of each of them, respectively. Although said gear (27) is used in the above described preferred embodiment, a sprocket may be used instead of said gear (27).
  • As clearly shown above, in a fixation apparatus for an electrostatic photographic copying machine according to the present invention, a heat resistant bush arranged between a bearing and said heating roller and a gear or a sprocket for revolving a heating roller are made of a resin material having a lower coefficient of thermal conductivity, an excellent heat resistance and the mechanical strength required for gears and thereby the rotation of a gear or a sprocket generates remarkably smaller noises as compared with those of the prior art made of sintered alloys, making a quiet operation possible, and the quantity of heat lost through said gear of sprocket being limited to the minimum value which allows for heating said heating roller effectively. In addition, said heat resistant bush can be formed integrally with said gear or sprocket for revolving said heating roller since they are made of the same material and thereby the assembly onto said heating roller can be simply and easily achieved by means of at least one assembling means.

Claims (2)

  1. (1) A fixation apparatus for an electrostatic photographic copying machine comprising a heating roller provided with a heater, a bearing for rotatably supporting said heating roller, a heating bush arranged between said bearing and said heating roller, and a gear or a sprocket for revolving said heating roller fixedly mounted on said roller , characterized in that said heat resistant bush (31) and said gear (27) or sprocket are formed integrally from a resin material having a lower coefficient of thermal conductivity, an excellent heat resistance and the mechanical strength required for gears.
  2. (2) A fixation apparatus for an electrostatic photographic copying machine as claimed in claim (1), characterized in that said resin materials area polyamide resin or a polyimide resin.
EP82107016A 1981-08-08 1982-08-03 A fixation apparatus for an electrostatic photographic copying machine Withdrawn EP0071969A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP118486/81 1981-08-08
JP11848681U JPS5823356U (en) 1981-08-08 1981-08-08 Fixing device in electrostatographic copying machine

Publications (2)

Publication Number Publication Date
EP0071969A2 true EP0071969A2 (en) 1983-02-16
EP0071969A3 EP0071969A3 (en) 1983-04-20

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ID=14737863

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82107016A Withdrawn EP0071969A3 (en) 1981-08-08 1982-08-03 A fixation apparatus for an electrostatic photographic copying machine

Country Status (2)

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EP (1) EP0071969A3 (en)
JP (1) JPS5823356U (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0506046A2 (en) * 1991-03-26 1992-09-30 Kanegafuchi Kagaku Kogyo Kabushiki Kaisha Fixing device and heat roller therefor
US7348701B2 (en) * 2003-12-27 2008-03-25 Samsung Electronics Co., Ltd. Driving unit and image forming apparatus

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH065427B2 (en) * 1983-12-29 1994-01-19 キヤノン株式会社 Fixing device
JPH0693154B2 (en) * 1987-11-06 1994-11-16 日立工機株式会社 Fixing device in electrophotographic apparatus
JP4250309B2 (en) * 2000-05-25 2009-04-08 キヤノン株式会社 Image heating device
JP4561284B2 (en) * 2004-09-30 2010-10-13 コニカミノルタビジネステクノロジーズ株式会社 Fixing device
JP5008519B2 (en) * 2007-10-17 2012-08-22 株式会社リコー Fixing device, image forming apparatus, and frame

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3942887A (en) * 1974-05-28 1976-03-09 Xerox Corporation Drive mechanism for a roll fuser employed in a copier apparatus
DE2654992A1 (en) * 1975-12-04 1977-06-08 Konishiroku Photo Ind FIXING DEVICE WITH A HEATED HOLLOW FIXING ROLLER FOR A PHOTOCOPER
JPS54149635A (en) * 1978-05-16 1979-11-24 Fujitsu Ltd Dry fixing roller for recorder
US4229950A (en) * 1979-03-02 1980-10-28 Eastman Kodak Company Coupling for end gudgeon and internally heated roller
DE3021737A1 (en) * 1979-06-11 1980-12-18 Tokyo Shibaura Electric Co FIXING DEVICE FOR AN ELECTRONIC REPLACEMENT DEVICE
GB2069931A (en) * 1980-02-14 1981-09-03 Konishiroku Photo Ind A fixing apparatus for electrophotography

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3942887A (en) * 1974-05-28 1976-03-09 Xerox Corporation Drive mechanism for a roll fuser employed in a copier apparatus
DE2654992A1 (en) * 1975-12-04 1977-06-08 Konishiroku Photo Ind FIXING DEVICE WITH A HEATED HOLLOW FIXING ROLLER FOR A PHOTOCOPER
JPS54149635A (en) * 1978-05-16 1979-11-24 Fujitsu Ltd Dry fixing roller for recorder
US4229950A (en) * 1979-03-02 1980-10-28 Eastman Kodak Company Coupling for end gudgeon and internally heated roller
DE3021737A1 (en) * 1979-06-11 1980-12-18 Tokyo Shibaura Electric Co FIXING DEVICE FOR AN ELECTRONIC REPLACEMENT DEVICE
GB2069931A (en) * 1980-02-14 1981-09-03 Konishiroku Photo Ind A fixing apparatus for electrophotography

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, Vol. 4, No. 10, 25 January 1980, page 23E167; & JP-A-54 149 635 *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0506046A2 (en) * 1991-03-26 1992-09-30 Kanegafuchi Kagaku Kogyo Kabushiki Kaisha Fixing device and heat roller therefor
EP0506046A3 (en) * 1991-03-26 1994-04-13 Kanegafuchi Chemical Ind
US5362943A (en) * 1991-03-26 1994-11-08 Kanegafuchi Kagaku Kogyo Kabushiki Kaisha Fixing device and heat roller therefor
US5420392A (en) * 1991-03-26 1995-05-30 Kanegafuchi Kagaku Kogyo Kabushiki Kaisha Fixing device and heat roller therefor
US7348701B2 (en) * 2003-12-27 2008-03-25 Samsung Electronics Co., Ltd. Driving unit and image forming apparatus

Also Published As

Publication number Publication date
JPS646517Y2 (en) 1989-02-20
JPS5823356U (en) 1983-02-14
EP0071969A3 (en) 1983-04-20

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Inventor name: IWAO, NORIYUKI