EP3214502B1 - Fixing device capable of setting position of claw member in accordance with kind of sheet, and image forming apparatus including the same - Google Patents

Fixing device capable of setting position of claw member in accordance with kind of sheet, and image forming apparatus including the same Download PDF

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Publication number
EP3214502B1
EP3214502B1 EP17158387.5A EP17158387A EP3214502B1 EP 3214502 B1 EP3214502 B1 EP 3214502B1 EP 17158387 A EP17158387 A EP 17158387A EP 3214502 B1 EP3214502 B1 EP 3214502B1
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EP
European Patent Office
Prior art keywords
fixing
sheet
claw
claw member
separation
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.)
Active
Application number
EP17158387.5A
Other languages
German (de)
English (en)
French (fr)
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EP3214502A1 (en
Inventor
Yuichiro Tanaka
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 Document Solutions Inc
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Kyocera Document Solutions 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.)
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Publication date
Application filed by Kyocera Document Solutions Inc filed Critical Kyocera Document Solutions Inc
Publication of EP3214502A1 publication Critical patent/EP3214502A1/en
Application granted granted Critical
Publication of EP3214502B1 publication Critical patent/EP3214502B1/en
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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
    • G03G15/2017—Structural details of the fixing unit in general, e.g. cooling means, heat shielding means
    • G03G15/2028—Structural details of the fixing unit in general, e.g. cooling means, heat shielding means with means for handling the copy material in the fixing nip, e.g. introduction guides, stripping means

Definitions

  • This invention relates to a fixing device and an image forming apparatus including the fixing device.
  • a typical image forming apparatus using an electrophotographic method includes a fixing device including a pressure roller that is brought into pressure contact with a fixing roller.
  • the fixing device applies pressure and heats to sheets passing between both rollers (through a fixing nip) to fix toner images on the sheets (fixing process).
  • the sheet enters the fixing nip while the surface on which the toner image is transferred is opposed to the fixing roller side.
  • the fixing device includes a separation claw constantly contacting a surface of the fixing roller.
  • This separation claw prevents the sheet after a fixing process from being wound around the fixing roller.
  • the separation claw constantly contacts (slidably contact) the fixing roller, and this causes a problem that the fixing roller is easily abraded.
  • a corresponding prior art fixing device is disclosed in JP-A-2012-203158 .
  • a fixing device including a mechanism (solenoid) that causes a separation claw to contact and be separated from a fixing roller. This mechanism is controlled such that the separation claw contacts the fixing roller only when the fixing process is performed.
  • a fixing device includes a fixing member, a pressure member, and a separating unit.
  • the fixing member is rotatably located.
  • the fixing member is heated or heatable by a heat source.
  • the pressure member is rotatably located.
  • the pressure member is in a pressure contact or capable of establishing a pressure contact with the fixing member to form a fixing nip.
  • the separating unit is configured to separate a sheet from the fixing member.
  • the sheet is attached on the fixing member when passing through the fixing nip.
  • the separating unit includes a sliding member, a claw member, and a turning mechanism.
  • the sliding member is located in a state of contacting a surface of the fixing member.
  • the claw member runs toward the fixing nip from the sliding member.
  • the claw member has a distal end portion.
  • the claw member is located in a state where the distal end portion contacts the surface of the fixing member.
  • the turning mechanism reciprocates the sliding member and the claw member along a rotation direction of
  • FIGS. 1 , 3 , 5 , and 7 paper-surface-front sides in FIGS. 1 , 3 , 5 , and 7 are defined as a front surface, and the preferred embodiment of the invention is described using directions indicated in the respective drawings as a reference.
  • a term of "conveyance direction” means a conveyance direction of a sheet S.
  • upstream,” “downstream,” and terms similar to these mean an "upstream” and a “downstream” of the conveyance direction, and a concept similar to these.
  • FIG. 1 schematically illustrates a cross section of an internal structure of the multi-functional peripheral 1.
  • the multi-functional peripheral 1 includes a printing device 1A and a scanning device 1B.
  • the printing device 1A forms images on the sheet S using an electrophotographic method.
  • the scanning device 1B includes components (not illustrated) that optically read image information of an original document.
  • the scanning device 1B is located above the printing device 1A across an in-barrel space 1C.
  • the scanning device 1B has a known structure, and thus the following omits the detailed description.
  • the printing device 1A includes an apparatus main body 2, a sheet feed cassette 3, and a sheet discharge tray 4.
  • the sheet feed cassette 3 is located in a lower portion of the apparatus main body 2 and is removably attachable in a front-rear direction.
  • the sheet feed cassette 3 houses paper (a bundle of) sheets S.
  • the sheet discharge tray 4 is located on a top surface of the apparatus main body 2 (a bottom surface of the in-barrel space 1C).
  • a main conveyance path 5 and an inverting conveyance path 6 are formed inside the apparatus main body 2.
  • the main conveyance path 5 vertically runs from the sheet feed cassette 3 to the sheet discharge tray 4.
  • the inverting conveyance path 6 vertically runs so as to communicate between an upstream portion and a downstream portion of the main conveyance path 5.
  • the printing device 1A includes a paper sheet feeder 10, an image forming unit 11, a fixing device 12, a discharging roller pair 13, and a control device 14.
  • the paper sheet feeder 10 is located in an upstream end portion of the main conveyance path 5.
  • the paper sheet feeder 10 conveys the sheets S from the sheet feed cassette 3 one by one to the main conveyance path 5.
  • the image forming unit 11 and the fixing device 12 are located in an intermediate portion of the main conveyance path 5.
  • the discharging roller pair 13 is located on a downstream end portion of the main conveyance path 5.
  • the control device 14 (control unit) integrally controls operations of the multi-functional peripheral 1.
  • the image forming unit 11 transfers a toner image on the sheet S.
  • the image forming unit 11 includes a toner container 20, a drum unit 21, and a light scanning device 22.
  • the toner container 20 houses, for example, a black toner (developer).
  • the drum unit 21 includes a photoreceptor drum 23, a charging apparatus 24, a developing device 25, a transfer roller 26, and a cleaning apparatus 27.
  • the charging apparatus 24, the developing device 25, the transfer roller 26, and the cleaning apparatus 27 are located in a peripheral area of the photoreceptor drum 23 in order of the transfer process.
  • the transfer roller 26 is brought into pressure contact with the photoreceptor drum 23 from a lower side to form a transfer nip 26a.
  • the fixing device 12 includes a pressure roller 32 that is brought into pressure contact with a fixing roller 31 to form a fixing nip N.
  • the fixing device 12 heats the sheet S passing through the fixing nip N to fix the toner image on the sheet S while applying pressure.
  • the control device 14 performs an image formation process based on, for example, image data read by the scanning device 1B as follows.
  • the charging apparatus 24 charges a surface of the photoreceptor drum 23.
  • the light scanning device 22 performs exposure (see the dashed line arrow in FIG. 1 ) in accordance with the image data on the photoreceptor drum 23.
  • the developing device 25 develops an electrostatic latent image on the photoreceptor drum 23 into the toner image.
  • the sheet S is transmitted to the main conveyance path 5 from the paper sheet feeder 10.
  • the toner image is transferred on a surface of the sheet S passing through the transfer nip 26a.
  • the fixing device 12 fixes the toner image on the surface of the sheet S. After a fixing process, the sheet S is discharged on the sheet discharge tray 4 by the discharging roller pair 13.
  • the sheet S is reversely conveyed by the discharging roller pair 13 to be conveyed to the inverting conveyance path 6 after the fixing process. After that, similarly to the above, the transfer and the fixing process of toner images are performed on the back surface of the sheet S. Then, the sheet S, on which the duplex printing has been performed, is discharged on the sheet discharge tray 4.
  • FIG. 2 schematically illustrates a planar view of an internal structure of the fixing device 12.
  • FIG. 3 illustrates a cross-sectional view taken along the line III-III in FIG. 2 .
  • FIG. 4 schematically illustrates a planar view of an internal structure of the fixing device 12, and illustrates a state where a claw member 41 and similar member are close to the fixing nip N.
  • FIG. 5 illustrates a cross-sectional view taken along the line V-V in FIG. 4 .
  • FIG. 6 schematically illustrates a planar view of an internal structure of the fixing device 12, and illustrates a state where the claw member 41 and similar member are separated from the fixing nip N.
  • FIG. 7 illustrates a cross-sectional view taken along the line VII-VII in FIG. 6 .
  • FIG. 8 illustrates a control system of the fixing device 12.
  • the fixing device 12 includes a fixing frame 30, the fixing roller 31, the pressure roller 32, a fixing motor 33, a heater 34, and a separating unit 35.
  • the fixing roller 31 as a fixing member is formed into a cylindrical shape long in the front-rear direction.
  • the fixing roller 31 is rotatably supported by the fixing frame 30. While the drawing is not illustrated, the fixing roller 31 is formed by laminating release layers (fluororesin) on an outer peripheral surface of a core material made of, for example, metal (aluminum, iron, or similar metal).
  • the pressure roller 32 as a pressure member is formed into a cylindrical shape long in the front-rear direction.
  • the pressure roller 32 is rotatably supported by the fixing frame 30. While the drawing is not illustrated, the pressure roller 32 is formed by laminating elastic layers (for example, silicon rubber) on an outer peripheral surface of a core material made of, for example, metal (aluminum, iron, or similar metal).
  • the pressure roller 32 includes release layers (fluororesin, not illustrated) coating the elastic layers.
  • the pressure roller 32 is urged by an urging member (not illustrated) to be brought into pressure contact with the fixing roller 31.
  • the fixing nip N is formed between the fixing roller 31 and the pressure roller 32.
  • the fixing motor 33 is connected to the fixing roller 31 via a gear train (not illustrated).
  • the fixing motor 33 rotatably drives the fixing roller 31 about its axis.
  • the pressure roller 32 is driven by the fixing roller 31 to rotate in a direction opposite to the fixing roller 31.
  • the heater 34 as heat source is, for example, a halogen heater or a ceramic heater.
  • the heater 34 is located in an internal space of the fixing roller 31 (see FIG. 3 ). The heater 34 heats the fixing roller 31.
  • the sheet S passes through the fixing nip N while its surface on which the toner image has been transferred is opposed to the fixing roller 31 side. This melts and applies pressure to the toner image (toners that constitute the toner image) to fix on the front or back surface of the sheet S.
  • the sheet S, which has passed through the fixing nip N, is possibly attached on (wound around) the fixing roller 31 because of an influence of the melted toners (see FIG. 3 ).
  • the separating unit 35 of the fixing device 12 is located so as to enable the sheet S, which is attached on the fixing roller 31 after passing through the fixing nip N, to be separated.
  • the separating unit 35 is located opposed to the fixing roller 31 on a downstream side of the fixing nip N.
  • the separating unit 35 includes the claw member 41 that contacts an outer peripheral surface of the fixing roller 31.
  • the claw member 41 relatively slides on the outer peripheral surface of the rotating fixing roller 31 to remove the sheet S attached on (wound around) the fixing roller 31.
  • a winding phenomenon of the sheet S around the fixing roller 31 easily occurs when the fixing process is performed on a tender sheet S, such as a thin paper (see FIG. 5 ). Additionally, this winding phenomenon possibly occurs when image formation is performed on the head side of the sheet S in the conveyance direction. That is because the sheet S is attached on the fixing roller 31 because of the melted toners. On the other hand, this winding phenomenon does not easily occur when the fixing process is performed on a tough sheet S, such as a cardboard (see FIG. 7 ). Thus, when the fixing process is performed on a tough sheet S, the claw member 41 is not often required. Therefore, the separating unit 35 of the fixing device 12 have a configuration that positions the claw member 41 at an appropriate position in accordance with a kind of the sheet S (for example, thickness and material), and a position of image on the sheet S.
  • a kind of the sheet S for example, thickness and material
  • the separating unit 35 includes a sliding member 40, the claw member 41, and a turning mechanism 42.
  • the sliding member 40 and the claw member 41 are integrally formed. While the details will be described later, the turning mechanism 42 is controlled by the control device 14 to reciprocate the sliding member 40 and the claw member 41 along a rotation direction of the fixing roller 31.
  • the sliding member 40 includes a slide shaft 40a and a plurality (for example, six) of sliding elements 40b. It is only necessary that one or more sliding element 40b is located in accordance with a width of the sheet S.
  • the slide shaft 40a is formed into a columnar shape (bar shape) long in the front-rear direction. Both front and rear end portions of the slide shaft 40a slidably fit guide grooves G depressed on both front and rear walls of the fixing frame 30. A pair of the front and rear guide grooves G is formed into a circular arc shape along the rotation direction of the fixing roller 31 (see FIG. 3 ).
  • the respective sliding elements 40b are shorter than the slide shaft 40a in the front-rear direction and are formed into a cylindrical shape having a diameter larger than that of the slide shaft 40a.
  • the plurality of sliding elements 40b are each secured in the front-rear direction of the slide shaft 40a at predetermined intervals.
  • the respective sliding elements 40b are located such that the sliding elements 40b have centers identical to that of the slide shaft 40a.
  • Each of the sliding elements 40b (the sliding member 40) is located in a state of contacting the outer peripheral surface (surface) of the fixing roller 31.
  • the claw member 41 includes a plurality (for example, six) of separation claws 41a.
  • the respective separation claws 41a are located corresponding to the sliding elements 40b.
  • Each of the separation claws 41a has one end portion (a base end portion) and is formed into a cantilever shape where the one end portion is secured to an upper portion of the sliding element 40b.
  • the respective separation claws 41a are formed such that the separation claws 41a decrease in thickness toward the other end portions (distal end portions).
  • the distal end portions of the respective separation claws 41a are formed into an acute angle viewed from front.
  • Each of the separation claws 41a (the claw member 41) runs toward the fixing nip N from the sliding member 40.
  • the claw member 41 is located in a state where the distal end portions of the respective separation claws 41a contact the outer peripheral surface (surface) of the fixing roller 31.
  • the sliding member 40 and the claw member 41 are guided to the guide grooves G and turn about the rotation shaft of the fixing roller 31.
  • the claw member 41 and the sliding member 40 are movably located along the rotation direction of the fixing roller 31.
  • the sliding member 40 and the claw member 41 are movably located between a close position P1 and a separation position P2 while being guided to the respective guide grooves G.
  • the close position P1 is located at the proximity of the fixing nip N (see FIG. 5 ).
  • the separation position P2 is located on a downstream side of the rotation direction of the fixing roller 31 with respect to the close position P1 (see FIG. 7 ). Between the close position P1 and the separation position P2, an intermediate position P3 is located (see FIG. 3 ).
  • the turning mechanism 42 includes a turning shaft 43, a pair of front and rear eccentric cams 44, a pair of front and rear tension springs 45, and a drive motor 46.
  • the turning shaft 43 is formed into an approximately columnar shape (bar shape) long in the front-rear direction. Accurately, the turning shaft 43 has a cross section where a part of the turning shaft 43 is cut out. The cross section has an approximately fan shape (approximately D shape) viewed from a side planar surface (see FIG. 3 ). The turning shaft 43 is rotatably supported by both the front and rear walls of the fixing frame 30.
  • the pair of the front and rear eccentric cams 44 are secured to both front and rear sides of the turning shaft 43 via boss portions 47.
  • the respective boss portions 47 are formed into an approximately annular shape so as to penetrate through the turning shaft 43.
  • the respective boss portions 47 are unrotatably secured to the turning shaft 43. That is, the respective boss portions 47 and the respective eccentric cams 44 integrally rotate with the turning shaft 43.
  • the pair of the front and rear eccentric cams 44 have an identical shape. Thus the following mainly describes one of the eccentric cams 44.
  • the eccentric cam 44 has one end portion (a base end portion) and is formed into a cantilever shape where the one end portion is secured to the boss portion 47.
  • the eccentric cam 44 has a lower surface formed into an approximately fan shape (half circular shape) having a curved arc shape viewed from front.
  • a cam surface 44a is formed on the lower surface of the eccentric cam 44.
  • the cam surface 44a includes a close cam surface F1 and a separation cam surface F2.
  • the separation cam surface F2 is formed on the boss portion 47 side (a base end side of the eccentric cam 44), and the close cam surface F1 is formed on a distal end side of the eccentric cam 44.
  • the close cam surface F1 and the separation cam surface F2 are formed as curved convex surfaces having respective different distances from a rotational center (the turning shaft 43).
  • the close cam surface F1 is formed so as to have a curvature larger than that of the separation cam surface F2.
  • a depression portion F3 is formed between (on a connection portion of) the close cam surface F1 and the separation cam surface F2.
  • the depression portion F3 is depressed on a portion at which the curvatures of the two cam surfaces F1 and F2 are switched.
  • the eccentric cam 44 is rotatably (swingably) located in a state where the cam surface 44a contacts the one sliding element 40b (the sliding member 40).
  • the close cam surface F1 is configured to move the claw member 41 and similar member to the close position P1.
  • the separation cam surface F2 is configured to move the claw member 41 and similar member to the separation position P2.
  • the claw member 41 and similar member are displaced to the separation position P2.
  • the depression portion F3 is configured to move the claw member 41 and similar member to the intermediate position P3. As illustrated in FIGS. 2 and 3 , in a state where the sliding element 40b is positioned at (fitted to) the depression portion F3, the claw member 41 and similar member are displaced to the intermediate position P3.
  • the pair of the front and rear tension springs 45 as an urging member are bridged between spring receiving portions 30a and the slide shaft 40a.
  • the spring receiving portions 30a are formed inside a left wall of the fixing frame 30.
  • the tension springs 45 are located so as to urge the sliding member 40 toward the cam surface 44a of the eccentric cam 44.
  • the claw member 41 and similar member are held at the respective positions P1 to P3 by a balance between urging forces of the respective tension springs 45 and forces received from the cam surfaces 44a (F1 and F2 (including also the depression portion F3, and the same applies to the following)) of the eccentric cams 44.
  • the drive motor 46 as a driving unit is connected to the turning shaft 43 via a gear train (not illustrated). While the details will be described later, the drive motor 46 is drivingly controlled by the control device 14. This causes the turning shaft 43 to rotate in positive and negative directions. That is, the drive motor 46 swings (reciprocally rotates) the respective eccentric cams 44 about the turning shaft 43.
  • the multi-functional peripheral 1 includes an operation panel 50 (see FIG. 8 ) with which a user performs input operation.
  • the user operates the operation panel 50 or an external terminal (not illustrated) connected to the multi-functional peripheral 1 to input a size and a kind (for example, thickness and material) of the sheet S.
  • the multi-functional peripheral 1 includes, for example, a power source (not illustrated) that supplies the respective units with power.
  • control device 14 includes an arithmetic processing unit (not illustrated) that executes arithmetic processing based on, for example, a program stored in a storage unit (not illustrated).
  • arithmetic processing unit (not illustrated) that executes arithmetic processing based on, for example, a program stored in a storage unit (not illustrated).
  • the fixing motor 33, the heater 34, the drive motor 46, and the operation panel 50 and similar unit (the respective units and similar unit) are electrically connected to the control device 14.
  • the respective units and similar unit are appropriately controlled by the control device 14. While the drawing is not illustrated, other units and similar unit, which are required for the image formation process, are also connected to and controlled by the control device 14.
  • the information which indicates a size and a kind of the sheet S and has been input by the user from the operation panel 50 or the external terminal, is transmitted to the control device 14.
  • the control device 14 recognizes an image formation position (printing position) on the sheet S based on the image data used for the image formation process.
  • the control device 14 controls the turning mechanism 42 in accordance with the kind of the sheet S or the position of toner image to be transferred on the sheet S.
  • the fixing process on a sheet S is performed in the state (the initial state) where the claw member 41 and similar member are moved to the intermediate position P3 (see FIGS. 2 and 3 ).
  • the claw member 41 and similar member are moved to the close position P1 (see FIGS. 4 and 5 ).
  • the drive motor 46 of the turning mechanism 42 is drivingly controlled by the control device 14 to cause the turning shaft 43 (the respective eccentric cams 44) to rotate clockwise in FIG. 3 .
  • the sliding member 40 is pushed rightward by the respective turning eccentric cams 44 (see FIG. 4 ) against the urging force of the respective tension springs 45.
  • the sliding members 40 relatively slide to the close cam surface F1 from the depression portion F3. That is, the claw members 41 and similar member are moved to the close position P1 from the intermediate position P3 (see FIGS. 4 and 5 ).
  • the control device 14 stops the driving of the drive motor 46.
  • the control device 14 performs an image formation process on a thin sheet S in a state where the claw member 41 and similar member are displaced to the close position P1. This removes the sheet S from the fixing roller 31.
  • the close cam surface F1 contacting the claw member 41 and similar member has a small curvature radius, and thus the respective separation claws 41a contact the fixing roller 31 under a large pressure (compared with a case where the separation cam surface F2 contacts the claw member 41 and similar member).
  • the claw members 41 and similar member are moved to the separation position P2 (see FIGS. 6 and 7 ).
  • the drive motor 46 is drivingly controlled by the control device 14 to cause the respective eccentric cams 44 to rotate anticlockwise in FIG. 3 .
  • the sliding members 40 are pressed to the respective turning eccentric cams 44 (in a left direction) by the urging forces of the respective tension springs 45.
  • the sliding members 40 relatively slide to the separation cam surface F2 from the depression portion F3. That is, the claw members 41 and similar member are moved to the separation position P2 from the intermediate position P3 (see FIGS. 6 and 7 ).
  • the control device 14 stops the driving of the drive motor 46.
  • the control device 14 performs an image formation process on a thick sheet S in a state where the claw member 41 and similar member are displaced to the separation position P2. This prevents a collision of the sheet S with the claw member 41 (the respective separation claws 41a).
  • the sliding member 40 receives both pressing forces from the respective swinging eccentric cams 44 and tensile forces from the respective tension springs 45.
  • the claw members 41 and similar member are movably located between the close position P1 and the separation position P2 in accordance with a ratio of the pressing force to the tensile force, which are received by the sliding member 40. Then, the control device 14 controls the movement of the claw members 41 and similar member in accordance with a kind of the sheet S and a position of an image on the sheet S.
  • the turning mechanism 42 moves the claw members 41 to the proximity of the fixing nip N (the close position P1). This claw members 41 remove the sheet S, which has passed through the fixing nip N, from the fixing roller 31. This prevents winding of the sheet S around the fixing roller 31.
  • the turning mechanism 42 moves the claw members 41 to the separation position P2, which is apart from the fixing nip N.
  • the claw member 41 is located at an appropriate position in accordance with, for example, a kind of the sheet S.
  • the close position P1 is configured to be positioned at a position at which the sheet S is separable from the fixing roller 31.
  • the separation position P2 is configured to be positioned at a position at which the collision of the sheet S is preventable.
  • the intermediate position P3 is configured to be positioned at a position at which the fixing process is appropriately performed on, what is called, a plain paper. That is, the intermediate position P3 is configured as a home position. It is preferred that the close position P1, the separation position P2, and the intermediate position P3 be positioned on the basis of, for example, outer diameters of the respective rollers 31 and 32, temperature, pressure of the fixing nip N, and properties of the toners.
  • Each of the sliding elements 40b (the sliding member 40) and each of the separation claws 41a (the claw member 41) contact the surface of the fixing roller 31, which enables each of the separation claws 41a (the claw member 41) to move while holding a constant contact angle on the surface of the fixing roller 31. Since constant contact pressure of each of the separation claws 41a (the claw member 41) is held, this ensures the reduced abrasion of the fixing roller 31.
  • the sliding member 40 is pressed to the cam surfaces 44a (F1 to F3) of the respective eccentric cams 44 by the urging force of the tension springs 45.
  • the sliding member 40 relatively slides on the cam surfaces 44a of the respective rotating eccentric cams 44 to cause the claw members 41 and similar member to reciprocate along the rotation direction of the fixing roller 31.
  • employing a cam mechanism as the turning mechanism 42 ensures the stable movement of the claw member 41 and similar member.
  • the respective eccentric cams 44 of the fixing device 12 is configured to swing (reciprocate)
  • the invention is not limited to this.
  • a circular plate cam that is rotatable by 360 degrees may be employed instead of the respective eccentric cams 44.
  • control device 14 of the fixing device 12 integrally controls the multi-functional peripheral 1
  • the invention is not limited to this.
  • a control unit to control the fixing device 12 may be independently provided in addition to the control device 14.
  • the above has described the case where the invention is apply to the multi-functional peripheral 1 (monochrome), not limited to this, the invention may be applied to, for example, a color printer and a facsimile.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Fixing For Electrophotography (AREA)
EP17158387.5A 2016-03-03 2017-02-28 Fixing device capable of setting position of claw member in accordance with kind of sheet, and image forming apparatus including the same Active EP3214502B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2016040963A JP6406286B2 (ja) 2016-03-03 2016-03-03 定着装置およびこれを備える画像形成装置

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EP3214502A1 EP3214502A1 (en) 2017-09-06
EP3214502B1 true EP3214502B1 (en) 2019-01-02

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JP7102916B2 (ja) * 2018-05-08 2022-07-20 京セラドキュメントソリューションズ株式会社 定着装置および画像形成装置

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EP3214502A1 (en) 2017-09-06
CN107153347A (zh) 2017-09-12
CN107153347B (zh) 2020-04-14
JP6406286B2 (ja) 2018-10-17
JP2017156605A (ja) 2017-09-07

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