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Publication numberUS3716018 A
Publication typeGrant
Publication dateFeb 13, 1973
Filing dateOct 6, 1970
Priority dateOct 9, 1969
Publication numberUS 3716018 A, US 3716018A, US-A-3716018, US3716018 A, US3716018A
InventorsK Kasuya, W Ohta
Original AssigneeRicoh Kk
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Device for heating and fixing toner images upon a recording medium
US 3716018 A
Abstract
A non-adhesive endless belt is used for heating and fixing toner images upon a recording medium by mounting the belt on a roller having means for heating it and on a driving roller spaced apart from the heated roller means. The recording medium is passed closely adjacent to or with its toner-carrying surface in contact with the surface of the heated belt to fuse the toner in the form of the image on the recording medium. Cleaning means and a preheated pressure roller are also provided to improve the quality of the fused toner image.
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Description  (OCR text may contain errors)

United States Patent 1191 Ohta et al. 1 Feb. 13, 1973 [541 DEVICE FOR HEATING AND FIXING 2,556,008 6/1951 Spalding ..219 19 TONER IMAGES UPON A RECORDING 3,374,769 3/1968 Carlson o ..l18/64l 3,132,047 5/1964 Van Dorn ..118/637 MEDIUM 3,377,598 4/1968 Borman ..118/101 [75] Invento s: Wasaburo O ta. Y ham Ka u- 2,684,047 7 1954 Walker ..1 18/101 hiko Kasuya, Kawasaki, both of Japan Primary Examiner-Mervin Stein [73] Assignee: Ricoh Co., Ltd., Tokyo, Japan Amsmm Mnstem Att0rneyHenry T. Burke, Robert Scobey, Robert S. Flledi 19,70 Dunham, P. E. Henninger, Lester W. Clark, Gerald [211 App]. 78,486 W. Griffin, Thomas F. Moran, R. Bradlee Boal and Christopher C. Dunham [30] Foreign Application Priority Data 57 ABSTRACT Oct. 9, 1969 Japan ..44/8137l A nomadhesive end|ess belt is used f heating and fixing toner images upon a recording medium by [52] US. Cl. ..Il8/l0l, 118/60, 1 18/202, mounting the be on a roller having means for heating I 18/641 it and on a driving roller spaced apart from the heated [51] Int. Cl ..B05C 11/02 roner means. The recording medium is passed closely [58] Field of Search ..118/101, 202, 257, 641, 637,

[56] References Cited UNITED STATES PATENTS 3,605,690 9/1971 Staller ..1 18/637 3,161,529 12/1964 Curme ..117/17.5

adjacent to or with its toner-carrying surface in contact with the surface of the heated belt to fuse the toner in the form of the image on the recording medium. Cleaning means and a preheated pressure roller are also provided to improve the quality of the fused toner image.

8 Claims, 6 Drawing Figures PAIENTEDFEBICB 1975 3.716.018

INVENTORS WAS/IBUPO OHM Y KAZZ/H/KO msum BACKGROUND OF THE INVENTION :r The present invention relates to a device'for heating and fixing toner images upon a recording medium in an electrophotographic process using dry methods or. a thermographic process.

Heat fixing is generally employed for fixing a visible image, for example, formed by toner containing easily fusible resin in an electrophotographic process by dry method. A heat source is employed such as an infrared ray lamp, a halogen lamp or a nichrome wire so that the visible image may be heated to a temperature between 100C and 1s0"c so as to be fused. However, this method has disadvantages in that the time required for raising the temperature of the visible image to a fixing temperature is quite long;'the thermal efficiency is low;

and other parts of the apparatus become heated. To overcome these problems, there have been proposed various methods, but none has been particularly successful in reducing the rise time for reaching the fixing temperature and accomplishing the perfect fixing at high speed. I

SUMMARY OF THE INVENTION One of the objects of the present inventionis to overcome the problems of the prior art device described above. p

Another object of the present invention is to provide an arrangement in which a recording medium is not brought into direct contact with a heating means and is prevented from being over-heated.

Another object of the present invention is to provide an arrangement for preventing the toner from being adhered to an endless belt for heating the toner.

Another object of the present-invention is to provide an arrangement for facilitating the easy removal of the toner adhered to the endless belt.

Another object of the present invention is to prevent overheating ofthe endless belt.

2 DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view in elevation a fundamental heating and fusing device in accordance with the present invention;

FIGS. 2 and 3 are sectional views as in FIG. 1 illustrating additional features thereof;

FIG. 4-A and FIG. 4B are side views illustrating the copies used in thermographic process; and

FIG. 5 is a sectional view in elevation of a device in accordance with the present invention for accomplishing the thermographic development of the copies shown in FIGS. 4-A and 4-B.

. DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 illustrates the fundamental arrangement of the present invention, in which a visible image 2 is formed by a developing agent (toner) containing fusible resins upon a recording medium 1 advanced in the a halogen lamp, a nichrome wire, etc. Alternatively,- the According to oneaspectof the present invention, a

non-adhesive endless belt is used for heating thetoner upon a recording medium. The endless belt rides about a heating roller incorporating therein a heater and a drive roller spaced apart from the heating roller so that the endless belt may be suitably cooledby the time it returns to the heatingvroller after it haslfused thetoner on the recording mediurnrThat is, the overheating of the endless belt maybeprevented. The endless belt for heating the toner may be brought into direct contact with the recording medium or may be spaced apart therefrom by a suitable distance. Preferably a rotary cleaning brush may be. positionedin contact with the endless belt for removal of the toner and other contaminants which cling to the endless belt. This arranger'nentis especially advantageous when the endless belt is in direct contact with'the recording medium.

A device in accordance with the present invention maybe used for heatinga heat-sensitive substance such as, for example, aheat-sensitive paper or a'stencil.

The present invention will become more apparent from the following description of the preferred embodiments taken in conjunction with the accompanying drawings.

roller 4 may serve as a heater. The toner is heated and fixed to the recording medium 1, so that the permanent image 8 may be formed. The endless belt 5 which wraps in it the hollow roller 4 and a spaced drive roller 6 is advanced at the same speed as that of the recording medium I in the direction b. A pressure roller 7 rotating in the direction indicated by the arrow c has its peripheral surface covered with an elastic member such as thermostable rubber capable of withstanding a temperature of 200 C and serves to press the toner image 2 against the endless belt 5 and to prevent the toner'image from being distorted. The fixing speed of the visible image may be improved when the pressure roller 7 is preheated to a temperature from 60 to C.

When the surface of the endless belt 5 is moved away from the heating roller 4, its temperature is lowered by cooling so that any toner attached thereto is sufficiently cooled to be easily removed from the endless roller 5. Furthermore, temperature control of the heating roller may be easily achieved.

In FIGS. 2 to 5, members which function as those in the embodiment illustrated in FIG. 1 are indicated by the same reference numerals. Therefore, the explanation of these members will not be made. In the. embodiment illustrated in FIG. 2, a cleaningbrush 9 rotates in the same direction with that of the roller 6 so as to clean the endless belt 5. Therefore, the endless belt 5 free from the toner may be always brought into contact with the heating roller 4.

The cleaning brush 9 is spaced apart from the heating roller 4 so that the aging of the cleaning brush 9 may be prevented. That is, the service life may be extended. As the endless belt 5 moves away from the heating roller 4, the toner attached thereupon is cooled, so that the removal of the toner upon the endless belt 5 may be further improved.

The embodiment illustrated in FIG. 3 is provided with an application roller 10 for applying silicon oil or the like over the endless belt Sin order to form a nonadhesive layer thereupon The application roller is coated with a permeable substance such as cloth 9' for holding silicon oil therein. The'application roller 10 rotates about a shaft 11 and makes contact with the endless belt 5 so that the non-adhesive layer may be formed upon the endless belt 5. Therefore non-adhesiveness of the endless belt surface 5 may be further improved.

FIG. 4-A and FIG. 4-B are side views of a heat-sensitive substance (thermographic copy) illustrating its thermographic process. The copy is, for example, a stencil. In FIG. 4-A, reference numeral 12 designates a heat-sensitive copy made of a porous paper or plastic sheet with waxy backing; and 13, an original to be reproduced in registration with the copy 12. lnfrared rays are irradiated from the back of the copy 12 so that the image (or printing) portion upon the original 13 (generally a black-colored portion) absorbs much infrared rays. The heat rays irradiated from the image or printing portion 13a upon the original 12 which is heated to a high temperature by the infrared rays 15 heats a portion on the copy 12 corresponding to the image or printing portion 13a of the original 13. In consequence, wax is melted so that the porous paper or plastic sheet 12a is exposed. The infrared rays 14 incident upon a non-image portion ornon-printing portion upon the original 13 are reflected and dissipated as shown by 16. Consequently, the temperature of the non-printing portion is not raised, so that a portion on the copy 12 corresponding to this non-printing portion will not melt..The reproduced copy 12 may be used as stencil in mimeographing.

The embodiment illustrated in FIG. 5 is for accomplishing the thermographic process whose principle has been explained with reference toFlG. 4-A and FIG. 4-B, by a heater in accordance with the present invention. The original 13 is placed over the copy 12 as shown and they are passed through the nip between the heating roller 4 and the pressure roller 7 in the direction indicated by the arrow 0. Thus, the thermographic process may be accomplished. The processing speed may be improved when the pressure roller 7 is pre-heated. The endless belt 5 serves to easily control the temperaturein the thermographic process.

What is claimed is:

1. A device for heating and fixing a toner image upon a toner-carrying recording medium being transported thereby comprising:

a. a heating roller disposed adjacent the path of travel of said recording medium;

b. an endless belt made of a thermostable substance and mounted for travel around said heating roller so as to transfer heat from said roller to the tonercarrying surface of said recording medium to fuse the toner thereon;

c. means for driving said endless belt in the same direction as that of said recording medium; and

d. a preheated pressure roller positioned opposite said heating roller and cooperating with said heating roller to pass said recording medium under pressure between them.

2. The device defined in claim 1 wherein said endless belt is made of a non-adhesive material.

3. The device defined in claim 1 wherein said heating roller is spaced agart from said belt-driving means.

4. The device efined in claim 1,1ncludmg means for cleaning the surface of said endless belt.

5. The device defined in claim 4 wherein said cleaning means is a rotating brush.

6. The device defined in claim 1 wherein an application means is provided for applying a non-adhesive coating upon the surface of said non-adhesive endless belt.

7. The device defined in claim 6 wherein said application means is a application roller coated with a permeable substance.

8. A device as in claim 1, wherein the pressure roller has a thermostable surface.

Patent Citations
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US2556008 *Dec 28, 1948Jun 5, 1951William F StahlPlastic-sealing apparatus
US2684047 *May 11, 1953Jul 20, 1954Walker Maurice MShingle painting and a machine therefor
US3132047 *Jun 29, 1961May 5, 1964Xerox CorpXerographic fixing apparatus
US3161529 *Mar 24, 1961Dec 15, 1964Eastman Kodak CoThermoxerography
US3374769 *Dec 6, 1965Mar 26, 1968Xerox CorpToner fusing apparatus
US3377598 *May 4, 1964Apr 9, 1968Motorola IncElectrical printing with ink replenishable web moving between styli and record
US3605690 *Mar 18, 1970Sep 20, 1971IttPrinting apparatus for transferring magnetic particles to a paper
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3827394 *Feb 11, 1972Aug 6, 1974Ricoh KkDeveloper apparatus
US3853552 *Nov 28, 1972Dec 10, 1974Ricoh KkMethod of fixing a toner by heating in electrophotographic duplication
US3878818 *Aug 10, 1973Apr 22, 1975Xerox CorpCleaning apparatus for dry fuser rolls
US3929094 *Jan 2, 1975Dec 30, 1975Xerox CorpRoll fuser
US3929095 *Jan 2, 1975Dec 30, 1975Xerox CorpRoll fuser
US3929096 *Jan 2, 1975Dec 30, 1975Xerox CorpRoll fuser
US3941558 *Nov 11, 1974Mar 2, 1976Rank Xerox Ltd.Contact-heating fixing device for electrophotography
US3948215 *Dec 20, 1974Apr 6, 1976Ricoh Co., Ltd.Fixing toner images in electrophotography
US3964431 *May 17, 1974Jun 22, 1976Ricoh Co., Ltd.Device for supplying an offset preventing liquid to a fixing roller
US3966394 *Apr 30, 1975Jun 29, 1976Xerox CorporationPlural cleaning rolls assembly
US3980423 *Apr 28, 1975Sep 14, 1976Xerox CorporationFuser cleaning roll assembly
US3980424 *Apr 28, 1975Sep 14, 1976Xerox CorporationFuser cleaning roller
US4092099 *Feb 8, 1977May 30, 1978Rank Xerox, Ltd.Copier paper delivery means in a heat-fixing device of a copying machine
US4515466 *May 27, 1982May 7, 1985Xerox CorporationSheet delivery station for copying apparatus
US4668073 *May 3, 1985May 26, 1987Dainippon Screen Mfg. Co., Ltd.Fixing apparatus
US4780742 *Jul 25, 1985Oct 25, 1988Canon Kabushiki KaishaImage quality improving process and apparatus and sheet usable therewith
US5081502 *Jul 12, 1988Jan 14, 1992Hitachi, Ltd.Radiant heat fixing apparatus
US5678134 *Mar 27, 1996Oct 14, 1997Olympus Optical Co., Ltd.Cleaning device for an image forming apparatus
US5697036 *Aug 12, 1996Dec 9, 1997Xerox CorporationSingle roll RAM system
US5946025 *Sep 29, 1997Aug 31, 1999Imation Corp.Thermal drum processor assembly with roller mounting assembly for a laser imaging device
US6007971 *Oct 9, 1997Dec 28, 1999Minnesota Mining And ManufacturingApparatus, system, and method for processing photothermographic elements
US6091480 *Jul 17, 1997Jul 18, 20003M Innovative Properties CompanyFilm removal mechanism for use with a thermal drum processor system
US6436482 *Dec 19, 1996Aug 20, 2002Sony CorporationUpper and lower heaters for the top and bottom surfaces of the substrate, and a thermoconductive heater block on whidch the substrate is placed for independently setting the temperatures of the upper and lower heaters
US6704526 *Mar 21, 2002Mar 9, 2004Canon Kabushiki KaishaImage heating apparatus adapted for cleaning of speed detection mark
US7359664 *Sep 1, 2005Apr 15, 2008Ricoh Co., Ltd.Fixing device for an image forming apparatus including supporting members for fixing belts of the fixing device
US20140119791 *Oct 29, 2012May 1, 2014Alan Richard PriebeToner fixer with heating liquid in cavity
EP0181723A1 *Oct 28, 1985May 21, 1986Xerox CorporationLow mass heat and pressure fuser
Classifications
U.S. Classification118/101, 118/60, 399/327, 432/75, 432/60, 118/641, 118/202
International ClassificationG03G15/20, G03B27/02, G03B27/30
Cooperative ClassificationG03B27/306, G03G2215/2032, G03G15/2007, G03G15/2064
European ClassificationG03G15/20H1, G03G15/20H2P, G03B27/30H