EP0129818A1 - Dispositif de fixation avec deux rouleaux - Google Patents

Dispositif de fixation avec deux rouleaux Download PDF

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Publication number
EP0129818A1
EP0129818A1 EP84106947A EP84106947A EP0129818A1 EP 0129818 A1 EP0129818 A1 EP 0129818A1 EP 84106947 A EP84106947 A EP 84106947A EP 84106947 A EP84106947 A EP 84106947A EP 0129818 A1 EP0129818 A1 EP 0129818A1
Authority
EP
European Patent Office
Prior art keywords
roller
roll
core
fixing device
center
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Withdrawn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
EP84106947A
Other languages
German (de)
English (en)
Inventor
Hermann Dr. Moser
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.)
Hoechst AG
Original Assignee
Hoechst AG
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 Hoechst AG filed Critical Hoechst AG
Publication of EP0129818A1 publication Critical patent/EP0129818A1/fr
Withdrawn legal-status Critical Current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
    • G03G15/20—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
    • G03G15/206—Structural details or chemical composition of the pressure elements and layers thereof

Definitions

  • Roller fixing device with a pair of rollers
  • the invention relates to a roller fixing device with a pair of rollers, consisting of a pressure roller and an internally heated fixing roller for fixing a toner image on a copy carrier, the pressure roller having a coated hollow roller core which is carried by a shaft.
  • Such a roller fixing station is known from European patent application 0 017 092, which is equipped with a pair of rotatable rollers, one of which has outwardly tapering end sections.
  • the roller consists of an outer sleeve, which is attached centrally to a shaft.
  • the main parts of the inner surface of the sleeve have stepped sections with increasing diameter at each tapered end of the sleeve.
  • plugs are mounted on parts of the shaft and axially displaceable via screw threads.
  • the main body of each plug has a smaller diameter than the surface part of the inner sleeve.
  • the plugs are rotatable on the shaft and can be moved from a retracted position in which there is play between the plugs and the sleeve of the roller to an engaged position in which end flanges of the plugs are engaged with the stepped parts of the sleeve.
  • In the retracted position there is no mechanical support for the end portions of the sleeve by the flanges of the plugs, so that the pressure of the counter-roller increases presses tapered end portions of the sleeve against the plug.
  • the degree of taper and the size of the gap between the stopper and the sleeve are coordinated so that the behavior of the roller under the action of the contact pressure corresponds to a substantially cylindrical, ie non-tapering roller.
  • the roller works like an essentially cylindrical roller that has no taper.
  • the tapered configuration of the roller is flattened.
  • the plugs can be adjusted by hand if the two rollers are separated from one another or by means of a motor controlled by a moisture sensor.
  • a By supporting the tapered edge zones, a creates a higher peripheral speed near the edge of the roll so that a copy paper that passes through the nip between the two rolls experiences a higher peripheral speed along the edges compared to the speed in the middle. As a result, the copy paper stretches and does not wrinkle even in high humidity. In very dry conditions, the higher edge zone speed leads to the formation of a copy paper wave in the middle, so that the toner image to be fixed comes into premature contact with the fixing roller shortly before entering the fixing device, which can cause smearing of the image.
  • a toner image fixing device comprising a heating and printing roller
  • a temperature sensor measures the surface temperature of the heating roller and the size of the pressure force of the printing roller on the heating roller is regulated as a function of the measured surface temperature.
  • This is intended to achieve a uniform fixing quality of the toner image on a copy sheet which is transported between the two rollers, since the fixing process is influenced both by the temperature and by the contact pressure between the two rollers in such a way that, for example, the surface temperature increases as the Contact pressure is reduced and the contact pressure is increased when the surface temperature drops.
  • the relationship between these two variables is regulated on the basis of a predetermined surface temperature / contact pressure relationship.
  • either a roller that tapers outwards in the end sections is used, which deforms under the pressure of another roller, in order to obtain a favorable pressure profile over the length of the roller to avoid wrinkling, or the contact pressure between the fixing and Pressure roller controlled according to the respective measured temperature so that a predetermined pressure / temperature relationship is maintained.
  • the object of the invention is to equalize the pressure characteristic of the pressure roller on the fixing roller in a fixing device of the type described in the introduction, so that when passing through copies in formats from DIN A4 to DIN A1 inclusive, the formation of folds or waves of copy materials, such as opaque or transparent papers or foils that show different behavior when passing through the fixing device are avoided.
  • the roll core is profiled in the form of a sleeve with a cylindrical inner surface and sawtooth-like pulled apart, multiple kinked outer surface.
  • the roll core is divided over the roll length into at least three zones which are symmetrical to the center of the roll.
  • the outer diameter of the roller core in the middle of the roller is equal to the outer diameter of the end faces of the roller core and are the maximum outer diameter of the core, which are between the center of the roll and the end faces, up to 2 mm larger than the outer diameter of the core in the middle of the roll.
  • the outside diameter of the end faces of the roll core can also differ from the outside diameter of the core of the roll center.
  • a coating of the roll core has a cylindrical outer shape and is firmly connected to the outside of the roll core, i.e. without space.
  • the coating of the pressure roller expediently consists of silicone elastomer, and a film tube of constant thickness is shrunk onto the coating. Due to the design of the pressure roller, a throughput speed profile is formed in the roller gap over the roller length, which has a minimum in the two edge zones and in the middle of the roller, and whose maxima lie between the left or right edge zone and the middle zone of the pressure roller.
  • the advantage is achieved that by a special profile shape of the metallic roller core of the pressure roller, which has a purely cylindrical outer shape, the passage speed of the copying material in the fusing roller gap over the roller length corresponding to the different layer thickness of the silicone elastomer coating and the different thickness of the Roll core is changed so that an operating state is reached in which copying materials with different throughput behavior during the fixing process, as is the case with opaque, transparent paper and foils, are processed equally well with avoidance of wrinkles of any kind even with the large formats DIN Al can.
  • a fixing device 1 shown in FIG. 1 comprises a heating roller 10 and a pressure roller 2.
  • the upper heating roller 10 or fixing roller is mounted in bearings 5 and 6, for example ball bearings, and the lower pressure roller 2 is mounted in bearings 23, 24, each inside the rollers are arranged.
  • the storage within the rollers takes place approximately at a distance of 20 mm from the respective end faces of the rollers.
  • the upper heating roller 10 has a length of approximately 670 mm and usually consists of an aluminum tube with a wall thickness of 5 to 10 mm and a silicone elastomer coating with a thickness of approximately 1 to 1.2 mm.
  • the coating with silicone elastomer ends about 30 to 32 mm in front of the end faces 17, 18 of the heating roller 10.
  • the pressure roller 2 also consists of an aluminum cylinder with a wall thickness of 5 to 7 mm and a coating of silicone elastomer and a tube made of a shrink film, the maximum thickness of the silicone elastomer coating together with that of the hose can be up to 5 mm. This coating extends from face to face.
  • the pressure roller 2 interacts with the heating roller 10 in order to grasp the copying material and to transport it through the gap between the two rollers.
  • the shaft section projecting from the end face 17 of the roller 10 carries a clutch 3 with a toothed wheel 26, which is driven by a toothed belt 4 or a roller chain.
  • a temperature sensor 19 for example a thermistor or a thermocouple, is arranged near the surface of the heating roller 10 opposite the center of the roller, the two connecting wires of which are connected to a controller 21, which is schematically indicated in FIG. 1 and which controls the copying program sequence.
  • a further temperature sensor 20 Near the surface and the one end face 17 of the heating roller 10 there is a further temperature sensor 20, namely a thermistor or a thermocouple, which is connected to the controller 21 with its two connecting wires.
  • the two temperature sensors ensure that the energy supply to heating elements which are arranged inside the heating roller is interrupted when predetermined temperatures are reached at the measuring points.
  • Connection wires 7, 8 or 7 ', 8' lead from the interior of the heating roller 10 to the controller 21, which has a control circuit for actuating relays which remove the connection to the mains supply of the heating elements when predetermined setpoint values of the temperature are reached.
  • the embodiment of the pressure roller 2 shown in section in FIG. 2 preferably consists of an aluminum roller core 9, which has a coating 11 of silicone elastomer on its outside.
  • the roller core 9 is non-cylindrical, and divided over its roller length 1 into at least three zones, which are symmetrical to the roller center M.
  • the outer diameter D of the roll core in the middle of the roll M is equal to the outer diameters D 1 , D 1 of the end faces 15, 15 'of the roll core.
  • the roll length l is the same 636 mm
  • the outer diameter D in the middle of the roller M is equal to 72.5 mm
  • the edge zones a and b are each 142.mm long and the central zone c is 352 mm.
  • the outer diameters D 1 and D 1 of the end faces and the outer diameters D 2 and D 2 can also have other values compared to the diameter D in the middle of the roll; the lengths a and b of the peripheral zones and the length c of the central zone can also be changed within certain limits.
  • the outer diameter D in the middle of the roll M is equal to 72 mm
  • the outer diameters D 2 and D 2 between the roll center M and the end faces are 74 mm.
  • the edge zones a and b are each 168 mm long and the central zone c is 300 mm.
  • the roller core 9 in the form of a sleeve has a cylindrical inner surface 12 and a sawtooth-like, multi-kinked outer surface 22.
  • a cylindrical outer shape of the pressure roller is maintained in that a coating 11 made of silicone elastomer of the roller core 9 has a cylindrical outer shape and is firmly connected to the outside of the roller core 9, i. the contours of the outer surface 22 of the roller core 9 is adapted.
  • a film tube 14 of constant thickness is expediently shrunk onto the coating 11 and preferably consists of perfluoroethylene propylene.
  • the profiling of the roller core results in an almost complete coverage of the required temperature / pressure characteristics of the roller pair arrangement in the roller gap for the different copying materials, such as opaque, transparent papers and foils, compared to pressure rollers with a cylindrical roller core.
  • Pressure rollers with a cylindrical roller core only have temperature / contact pressure characteristics to avoid wrinkling in transparent papers or to avoid duplication in opaque papers, which do not overlap or to a lesser extent.
  • the profile turning of the roller core 9; in order to obtain the corresponding contours of the outer surface 22 is associated with very little additional cost compared to the production of a cylindrical roller core. It is also advantageous that the outer shape of the pressure roller is cylindrical and can therefore be easily processed.
  • FIG. 3 schematically shows the profile of the throughput speed of the copying material in the nip over the roll length 1. It can be seen that the areas with the highest throughput speed, ie with the greatest propulsion in the nip, are not on the edges or end faces of the pressure roller, enstead more are shifted towards the center of the roll M.
  • This profile of the running speed is a certain analogy to the pressure load of a carrier on two supports with equal deflection in the middle and at the both ends, wherein in the two edge zones, and in the W al zenmitte each a minimum of the throughput speed occurs and maxima at the Interfaces between. the left or right edge zone and the middle zone c of the pressure roller 2.
  • the throughput speed in the vicinity of the roller edges or in the edge zones a and b compared to the throughput speed in the middle of the roller M is sufficiently high to fix transparent paper without wrinkles.
  • Opaque paper with the so-called bow-wave length and in height is so small that it can no longer have an interfering effect, and thus a duplication of the K opiensentes is prevented.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Fixing For Electrophotography (AREA)
EP84106947A 1983-06-27 1984-06-18 Dispositif de fixation avec deux rouleaux Withdrawn EP0129818A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3323068 1983-06-27
DE19833323068 DE3323068A1 (de) 1983-06-27 1983-06-27 Walzenfixiervorrichtung mit einem walzenpaar

Publications (1)

Publication Number Publication Date
EP0129818A1 true EP0129818A1 (fr) 1985-01-02

Family

ID=6202484

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84106947A Withdrawn EP0129818A1 (fr) 1983-06-27 1984-06-18 Dispositif de fixation avec deux rouleaux

Country Status (4)

Country Link
US (1) US4540267A (fr)
EP (1) EP0129818A1 (fr)
JP (1) JPS6014272A (fr)
DE (1) DE3323068A1 (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL8501717A (nl) * 1985-06-14 1987-01-02 Oce Nederland B V Patents And Contactfixeerinrichting.
DE3782224T2 (de) * 1986-09-22 1993-02-25 Onoda Cement Co Ltd Waermefixierwalze zur verwendung in einem kopiergeraet und verfahren zu ihrer herstellung.
US4887964A (en) * 1987-07-10 1989-12-19 Canon Kabushiki Kaisha Image fixing roller and image fixing apparatus using same
EP0534417B1 (fr) * 1991-09-24 1997-02-12 Canon Kabushiki Kaisha Appareil de chauffage d'une image comprenant plusieurs détecteurs de température
US5450181A (en) * 1993-05-11 1995-09-12 Canon Kabushiki Kaisha Fixing device
KR970007538A (ko) * 1995-07-04 1997-02-21 김광호 전자사진 방식을 이용한 기기의 히팅롤러장치
US5689789A (en) * 1996-03-22 1997-11-18 Xerox Corporation Uniform nip velocity roll fuser
US5689788A (en) * 1996-03-22 1997-11-18 Xerox Corporation Heat and pressure roll fuser with substantially uniform velocity
KR100700978B1 (ko) * 2005-10-06 2007-03-29 삼성전자주식회사 화상형성장치 및 프레싱롤러장치

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3999038A (en) * 1974-11-25 1976-12-21 Xerox Corporation Flared fuser roll
US4042804A (en) * 1975-09-24 1977-08-16 Xerox Corporation Roll fuser apparatus
US4050886A (en) * 1976-09-24 1977-09-27 Xerox Corporation Roll fuser
US4356764A (en) * 1981-05-04 1982-11-02 Minnesota Mining And Manufacturing Company Pressure rollers for toner fusing station

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1112710A (fr) * 1977-12-07 1981-11-17 Willy G. Ceuppens Appareil a fusion avec fixation d'images par la chaleur
JPS5492747A (en) * 1977-12-29 1979-07-23 Minolta Camera Co Ltd Pressure fixing device of powder lmages
US4232959A (en) * 1978-09-05 1980-11-11 Eastman Kodak Company Toner image fusing apparatus
US4253392A (en) * 1979-04-09 1981-03-03 International Business Machines Corporation Hollow fuser roll with variable taper
US4348579A (en) * 1979-06-28 1982-09-07 Rank Xerox Limited Fixing roll in a copying machine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3999038A (en) * 1974-11-25 1976-12-21 Xerox Corporation Flared fuser roll
US4042804A (en) * 1975-09-24 1977-08-16 Xerox Corporation Roll fuser apparatus
US4050886A (en) * 1976-09-24 1977-09-27 Xerox Corporation Roll fuser
US4356764A (en) * 1981-05-04 1982-11-02 Minnesota Mining And Manufacturing Company Pressure rollers for toner fusing station

Also Published As

Publication number Publication date
JPS6014272A (ja) 1985-01-24
US4540267A (en) 1985-09-10
DE3323068A1 (de) 1985-01-03

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Designated state(s): DE FR GB IT NL

17P Request for examination filed

Effective date: 19850601

17Q First examination report despatched

Effective date: 19870424

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18W Application withdrawn

Withdrawal date: 19881010

RIN1 Information on inventor provided before grant (corrected)

Inventor name: MOSER, HERMANN, DR.