JP2005300931A - Fixing apparatus and image forming apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the breakage of a peeling member, in the maintenance work of eliminating paper-jamming related to a fixing apparatus. <P>SOLUTION: A heat roller 22 and a cover unit 30 for covering the peripheral surface on the paper ejection side of the heat roller 22, in a state where the unit 30 is stored in the storage position in the copier body 11, on the other hand, for securing a maintenance space on the paper ejection side of the heat roller 22, in a state where the unit 30 is drawn from the storage position are loaded to the copier body 11, and the peeling member 60 for peeling a paper P wound around the heat roller 22 and a cover member 80 for covering the peeling member 60 are arranged in the cover unit 30; and the cover member 80 is set in a retracted attitude, where the cover member 80 is retreated from the leading end of the peeling member 60, in a state where the cover unit 30 is stored in the copier body 11; whereas, the cover member 80 is set in a covering attitude, where the leading end of the peeling member 60 is covered with the cover member 80, in a state where the cover unit 30 is pulled out of the copier body 11. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a fixing device including a peeling member that peels a sheet from a fixing roller, and an image forming apparatus equipped with the fixing device.

  Conventionally, a fixing device as described in Patent Document 1 is known. This fixing device is applied to an electrophotographic image forming apparatus such as a copying machine or a facsimile machine, and performs a fixing process on a toner image on a sheet transferred by a photosensitive drum. Such a fixing device includes a heat roller and a pressure roller that are opposed to each other, and a toner image is fixed on a sheet by heat treatment by passing the sheet through a nip portion between both rollers. Yes.

  The paper that has passed through the nip between the heat roller and the pressure roller is in a state of being wound around the heat roller when the melted toner adheres to the heat roller. A peeling claw as a peeling member opposed to the peripheral surface is provided, and the paper is peeled off from the heat roller with the peeling claw. The peeling claw is provided in a cover unit that is provided on the downstream side of the fixing device and discharges the paper after the fixing process.

  By the way, for example, when a paper jam occurs in the fixing device or when maintenance work is performed, the cover unit is pulled out from the main body of the image forming apparatus, and a working space is secured on the downstream side of the fixing device. However, the tip of the peeling claw that is easily damaged is exposed to the outside in a state where the working space is secured.

Therefore, in the fixing device described in Patent Document 1, the cover member protrudes further forward from the tip of the peeling claw in conjunction with the cover unit being pulled out from the apparatus main body. By doing so, the tip of the peeling claw is covered with the covering member, so that the tip of the peeling claw is hardly damaged (paragraph [0073] of FIG. 1 and FIG. 9).
JP 2002-357975 A

  However, in the thing of patent document 1, since the covering member is moved in parallel with the extending direction of the peeling claw and is positioned forward of the tip of the peeling claw, a hand is placed in the work space. When the work is carried out, an object (tool or the like) held in the hand may hit the peeling claw, and it is difficult to say that secure prevention of damage is necessarily realized.

  The present invention has been made in view of such a situation, and a fixing device capable of ensuring the sure prevention of breakage of the peeling claw in maintenance work such as paper jam elimination related to the fixing device and the fixing device are applied. An object of the present invention is to provide an image forming apparatus.

According to a first aspect of the present invention, there is provided a heat roller for fixing a toner image on the paper by heating the paper on which the toner image has been transferred to a predetermined apparatus body while conveying the paper by rotation around an axis. A cover unit that covers a peripheral surface on the paper discharge side of the heat roller by being stored in a storage position in the apparatus main body, and that secures a maintenance space on the paper discharge side of the heat roller by being pulled out from the storage position. Is a fixing device to which is attached,
The cover unit includes a peeling member that peels off the paper wound around the heat roller, and a covering member that covers the peeling member, the covering member being in the state where the cover unit is housed in the apparatus main body. The posture is set to the retracted posture retracted from the tip of the peeling member, and the posture is set to the covering posture covering the tip of the peeling member in a state where the cover unit is pulled out from the apparatus main body. The fixing device is characterized.

  By adopting such a configuration, the cover member is set in a retracted posture in which the cover unit is retracted from the tip of the peeling member in a state where the cover unit is housed in the apparatus main body, and therefore, the paper wound around the rotating heat roller is not The peeling member is peeled off by the peeling member in contact with the peripheral surface of the heat roller and then discharged to the outside through the cover unit. On the other hand, in the state where the cover unit is pulled out from the apparatus main body for maintenance work, Therefore, even if the operator inserts an object into the space formed on the downstream side of the heat roller, the object is prevented from hitting the tip of the peeling member.

  According to a second aspect of the present invention, in the first aspect of the present invention, the cover unit includes a guide member that guides the posture change of the cover member, and the cover member is guided by the guide member and is forward and reverse. The covering posture is provided by having a first guided piece that moves and rotating around the first guided piece in a state in which the cover unit is pulled out from the apparatus main body and positioned on the distal end side of the guide member. On the other hand, when the cover unit is housed in the apparatus main body, the first guided piece is positioned on the proximal end side of the guide member so that the posture is set to the retracted position. It is characterized by that.

  According to this configuration, the cover member that is set in the retracted position retracted from the peeling member when the cover unit is housed in the apparatus main body has the first guide piece guided by the guide member by pulling the cover unit out of the apparatus main body. The posture is changed to a covering posture that covers the tip of the peeling member while being guided by the guide.

  According to a third aspect of the present invention, in the second aspect of the present invention, the guide member includes a linear guide portion substantially parallel to the peeling member, and the covering member includes the first guided piece in addition to the first guided piece. A second guided piece guided by the linear guide portion, and the second guided piece is located at a position where the covering member can be rotated around the first guide piece by detaching from the linear guide portion. Is provided.

  According to this configuration, the covering member can go straight when both the first guided piece and the second guided piece are guided by the linear guide portion, and the second guided piece is straight. Since the linear guide part is in a state where only the first guided piece exists, the covering member can be rotated around the first guided piece in this state and retracted. Change posture from posture to covering posture.

  According to a fourth aspect of the present invention, in the third aspect of the invention, the first urging means for urging the covering member toward the heat roller, and the rotating member to rotate toward the peeling member. A second urging means for urging is provided, and the apparatus main body restricts the protrusion of the cover member from the linear guide portion in a state where the cover unit is housed in the apparatus main body, while the cover A stopper is provided that allows the cover member to protrude from the linear guide portion when the unit is pulled out from the apparatus main body.

  By adopting such a configuration, the cover member urged toward the heat roller by the first urging means in a state where the cover unit is housed in the apparatus main body is regulated by a stopper provided in the cover unit. Therefore, it does not collide with the heat roller. On the other hand, in the state where the cover unit is pulled out from the apparatus main body, since the restriction by the stopper is released, the covering member is projected toward the heat roller by the urging force of the first urging means.

  Further, since the cover member is provided with second urging means for urging the cover member to rotate toward the peeling member, the cover member protruding toward the heat roller is provided with the second attachment member. The urging force of the urging means rotates around the first guided piece to cover the tip of the peeling member.

  According to a fifth aspect of the present invention, there is provided an image forming apparatus comprising the fixing device according to any one of the first to fourth aspects, wherein the image forming unit forms a toner image on a fed paper. The sheet ejected from the image forming unit is configured to be fed to the fixing device.

  An image forming apparatus having such a configuration has the function of the fixing device according to claims 1 to 4.

  According to the first aspect of the present invention, since the cover member is set in a retracted position in which the cover unit is retracted from the tip of the peeling member in a state where the cover unit is accommodated in the apparatus main body, the cover member is wound around the rotating heat roller. While the paper is peeled off by the peeling member in contact with the peripheral surface of the heat roller and then discharged to the outside through the cover unit, the cover unit is pulled out of the apparatus main body for maintenance work. Since the posture is set to cover the tip of the peeling member, even if the operator inserts a hand or a tool held in the hand into the space formed on the downstream side of the heat roller, the hand does not hit the tip of the peeling member Can be.

  Thus, the covering member according to claim 1 can ensure higher safety and prevent damage to the peeling claw by covering the peeling member in a state of wrapping around the tip of the peeling member. Therefore, it is possible to perform paper jam clearing work and maintenance work without having to worry about the peeling member as compared with the conventional cover member that simply translates toward the tip of the peeling member. Can be greatly improved.

  According to the second aspect of the present invention, the cover member that is set in the retracted position retracted from the peeling member when the cover unit is housed in the apparatus main body is pulled out of the apparatus main body by pulling the cover unit from the apparatus main body. It is possible to cause the cover member to change its posture by each operation of inserting and removing the cover unit with respect to the apparatus body, such as changing the posture to cover the tip of the peeling member while the piece is guided by the guide member Thus, the posture changing operation of the covering member can be easily performed.

  Thus, by adopting a configuration in which the first guide piece is guided by the guide member, the cover member posture changing structure can be simplified, and the manufacturing cost of the posture changing structure can be reduced. Can contribute.

  According to the third aspect of the present invention, the covering member can move straight when both the first guided piece and the second guided piece are guided by the linear guide portion, and the second covered piece is provided. When the guide piece is detached from the linear guide portion, only the first guided piece is present in the linear guide portion, and in this state, the covering member can be rotated around the first guided piece. Therefore, the posture can be changed between the retracted posture and the covering posture.

  In this way, by allowing the first and second guided pieces to be guided by the linear guide portion, it becomes possible to simplify the posture changing structure of the covering member, and thereby the posture changing structure of the covering member. This can contribute to a reduction in manufacturing costs.

  According to the fourth aspect of the present invention, the cover member urged toward the heat roller by the first urging means in a state where the cover unit is housed in the apparatus main body is restricted by the stopper provided in the apparatus main body. Therefore, it does not collide with the heat roller. On the other hand, in the state where the cover unit is pulled out from the apparatus main body, since the restriction by the stopper is released, the covering member is projected toward the heat roller by the urging force of the first urging means, and the covering member Since the second urging means for urging the covering member to rotate toward the peeling member is provided, the urging force of the second urging means of the covering member protruding toward the heat roller is provided. The tip of the peeling member can be covered with the covering member by turning around the first guided piece.

  According to the invention described in claim 5, the image forming apparatus can be provided with the function of the fixing device described in claims 1-4.

  First, the outline of the internal structure of a copying machine (image forming apparatus) 10 to which the fixing device according to the present invention is applied will be described with reference to FIG. FIG. 1 is a schematic explanatory view in cross-section showing an embodiment of the internal structure of a copying machine 10 according to the present invention. As shown in this figure, a copying machine 10 is provided with a document reading section 12 for reading a document image at the upper part of a box-shaped copying machine body (apparatus body) 11 and a document in the copying machine body 11. An image forming unit 13 that forms an image based on image information of a document read by the document reading unit 12 at a position below the reading unit 12, and a fixing process for an image formed by the image forming unit 13 and transferred to a sheet The fixing unit 14 that performs the above and the sheet storage unit 15 that stores the transfer sheet are internally provided.

  The document reading unit 12 includes a document presser 121 provided on the upper surface of the copier body 11 so as to be openable and closable, and an optical system unit 122 disposed in the copier body 11 so as to face the document presser 121 via a contact glass 123. It is configured with. The contact glass 123 includes a placed document contact glass 123a having a slightly smaller planar shape than the document presser 121 for reading the document surface of the placed document, and a front-rear direction for reading the document surface of the automatically fed document. Is provided with a long and thin contact glass 123b for automatic paper feeding.

  On the upper surface of the copying machine main body 11 on the front side of the document reading unit 12, an operation panel 124 for inputting processing conditions relating to document reading and copying is provided. The operation panel 124 is disposed on the upper surface of the front portion of the processing copier main body 11, and is provided with a display panel, a numeric keypad, a start button, a mode switching key, and the like (not shown). The display panel displays various types of input information and output information on a liquid crystal display, or inputs information selected through the displayed processing conditions by a touch-in operation. The numeric keypad is mainly for setting quantity information such as the number of copies. The mode switching key is for switching the mode of the copying machine 10, and the copying machine 10 can be used as a facsimile machine or a printer by pressing the mode switching key. Yes.

  The document presser 121 is attached to the copying machine main body 11 so as to be opened and closed by rotating forward and backward about a predetermined axis provided on one side of the upper surface of the apparatus main body. The document presser 121 has a two-stage structure, and includes a document tray 125 for placing a document provided at the upper level, and a document discharge tray 126 for discharging a scanned image document provided at the lower level. And have. A document feeding portion 127 interposed between the document tray 125 and the document discharge tray 126 is formed on the left side of the document retainer 121, and an unillustrated document feeding mechanism provided in the document feeding portion 127 is used. One document at a time is picked up from a bundle of sheets placed on the document tray 125 and supplied to the automatic feeding contact glass 123b. The picked-up document is read by the optical system unit 122 through the automatic paper feeding contact glass 123b while being moved. The original after the original image is read is discharged to the original discharge tray 126.

  The optical system unit 122 includes a light source (not shown), a plurality of mirrors, a lens unit, and a CCD (charge coupled device). Then, light from the light source is reflected on the surface of the original, and this reflected light is input to the CCD as an upper part of the original via these mirror and lens unit. The document information as an analog amount input to the CCD is converted into a digital signal and stored in a predetermined storage device as digital document information.

  The image forming unit 13 forms a toner image on the paper fed from the paper storage unit 15. In this embodiment, the image forming unit 13 sequentially arranges the image from the upstream side (the right side of the paper surface in FIG. 1) to the downstream side. A yellow unit 13Y, a magenta unit 13M, a cyan unit 13C, and a black unit 13K are provided.

  Each unit 13Y, 13M, 13C, 13K is provided with a photosensitive drum 131 and a developing device 132, respectively. Each photoconductive drum 131 is supplied with toner from a corresponding developing device 132 while rotating clockwise in FIG.

  A charging unit 133 is provided at a position on the upper left side in FIG. 1 of each photoconductor drum 131, and an exposure unit 134 is provided at a position on the upper right side in FIG. Each photosensitive drum 131 is uniformly charged at its peripheral surface by the charging unit 133, and a laser beam based on image data input from the document reading unit 12 is charged from each exposure unit 134. By irradiating the peripheral surface of 131, an electrostatic latent image is formed on the peripheral surface of each photosensitive drum 131. By supplying toner from the developing device 132 to the electrostatic latent image, a toner image is formed on the peripheral surface of the photosensitive drum 131.

  Further, a cleaning device 135 for removing and cleaning residual toner on the peripheral surface of the photosensitive drum 131 is provided at the lower left position in FIG. 1 of each photosensitive drum 131. The peripheral surface of the photosensitive drum 131 cleaned by the cleaning device 135 goes to the charging unit 133 for a new charging process.

  Below each photoconductor drum 131, a transport belt 136 is provided so that the transport surface faces each photoconductor drum 131. The conveyor belt 136 is wound around a driving roller 137 provided slightly downstream of the black unit 13K and a driven roller 138 provided slightly upstream of the yellow unit 13Y. It goes around by driving. The paper supplied from the paper storage unit 15 is guided by the circumference of the transport belt 136 and moves while abutting on the peripheral surface of the photosensitive drum 131 to be subjected to a transfer process.

  The fixing unit 14 performs fixing processing on the toner image on the paper transferred by the image forming unit 13 and discharges the toner image. The fixing device 20 performs fixing processing on the toner image, and the toner image fixing processing. And a cover unit 30 that discharges the sheet on which the mark is applied.

  The fixing device 20 is formed by internally installing a heat roller 22 and a pressure roller 23 that are opposed to each other vertically in a fixing device main body 21. Then, the transfer-processed paper led out from the image forming unit 13 by the rotation of the conveying belt 136 is fixed between the heat roller 22 and the pressure roller 23 while being pressed and nipped, and the toner image is fixed. A stable color image is formed on the paper. The sheet with the color image for which the fixing process has been completed passes through a paper discharge conveyance path 102 formed at a position below the document presser main body 30, and is a paper discharge tray 101 that protrudes from the left side wall in FIG. It is discharged towards.

  The cover unit 30 is provided with a peeling member 60 described later and a covering member 80 that covers the peeling member 60 from above. The peeling member 60 is set at an installation position so that a tip portion of the peeling member 60 comes into contact with the peripheral surface of the heat roller 22 in a state where the cover unit 30 is stored in the storage position in the copying machine main body 11. The paper wound around the peripheral surface of the rotating heat roller 22 is peeled off.

  The cover member 80 is set in a retracted position in which the cover unit 30 is retracted from the peripheral surface of the heat roller 22 in a state where the cover unit 30 is stored in the storage position in the copying machine main body 11, while the cover unit 30 is pulled out from the storage position. Accordingly, the posture is set to a covering posture that covers the tip of the peeling member 60.

  The paper storage unit 15 has a plurality of paper trays 151 that are detachably attached to the copying machine main body 11. Each sheet tray 151 stores a sheet bundle. Then, the paper P is fed out from the paper bundle of the selected paper tray 151 one by one by driving the pickup roller 152, and introduced into the image forming unit 13 through the paper feeding / conveying path 153.

  In the copying machine 10 of the present embodiment, a sheet reversing unit 16 for performing duplex printing on the sheet P is provided in the copying machine main body 11. The sheet reversing unit 16 is interposed between the image forming unit 13 and the sheet storage unit 15 and temporarily stores the sheet P having the image after the fixing process on one side, and the fixing unit 14. And a switching guide 162 that distributes the paper P to one of the paper discharge conveyance path 102 and the return conveyance path 103 with respect to the paper P after the fixing process, and once discharged to the intermediate tray 161. A reverse roller pair 163 that discharges the paper P from the rear end side is provided.

  Then, the paper P once discharged to the intermediate tray 161 through the return conveyance path 103 and the reverse roller pair 163 by the switching operation of the switching guide 162 is discharged from the rear end side by the reverse rotation of the reverse roller pair 163. The sheet is directed to the paper feed conveyance path 153 through the reverse conveyance path 104. The paper P that has been turned upside down and supplied to the paper feed conveyance path 153 is supplied again to the image forming unit 13, whereby the back side is subjected to a transfer process.

  FIG. 2 is an exploded perspective view showing the first embodiment of the cover unit 30. 3 and 4 are assembled perspective views of the cover unit 30 shown in FIG. 2. FIG. 3 shows a state in which the cover unit 30 is stored in the storage position in the copying machine main body 11, and FIG. A state in which the unit 30 is pulled out from the storage position of the copying machine main body 11 is shown. 2 to 4, the XX direction is referred to as the width direction, and the YY direction is referred to as the front-rear direction. In particular, the -X direction is leftward, the + X direction is rightward, the -Y direction is forward, and the + Y direction is forward. It is called the back.

  As shown in these drawings, the cover unit 30 includes a base body 40 that is rotatably mounted between mutually opposing side walls 110 of the copier body 11, and a support plate that is pivotally supported by the base body 40. 50, a peeling member 60 fixed to the support plate 50, a pair of width direction cover unit side guide members 70 fixed to the support plate 50, and the cover unit side guide member 70 so that the posture can be changed. And a covering member 80. A pair of fixing device side guide members 90 in the width direction are provided on the side walls 210 of the fixing device main body 21 facing each other. These fixing device side guide members 90 are for guiding insertion / removal of the cover unit 30 with respect to the copying machine main body 11.

  The base body 40 and the support plate 50 are members that form the basis of the cover unit 30, and constitute the support plate 50, the peeling member 60, the cover unit side guide member 70 and the cover member 80, and the cover unit 30. Various components are mounted.

  The peeling member 60 peels off the paper P wound around the peripheral surface of the heat roller 22 by bringing the leading edge into contact with the peripheral surface of the heat roller 22 (FIG. 1). The cover unit 30 covers the leading edge of the peeling member 60 in a state where the cover unit 30 is pulled out from the mounting position in the copying machine body 11 to the opening side of the copying machine body 11. Further, the cover unit side guide member 70 causes the cover member 80 to change the posture between the covering posture and the retracted posture in a state where the cover unit 30 is pulled out from the mounting position and a state where the cover unit 30 is mounted in the mounting position. It is. Further, the fixing device side guide member 90 causes the cover unit 30 to change its posture between a bent posture and an extended posture when the cover unit 30 is pulled out from the copying machine main body 11 and pushed into the copying machine main body 11. Is.

  Hereinafter, each member which comprises the cover unit 30 is demonstrated in detail. First, the base 40 has a base frame 41 that is long in the width direction and whose length is set slightly shorter than the internal dimension between the pair of opposed side walls 110 of the copying machine main body 11, and the base frame 41. It is composed of a projecting frame 42 projecting forward from the front edge. The base frame body 41 includes a pair of side frames 411 in the width direction, a rear frame 412 constructed between rear end edges of each side frame 411, a front frame 413 constructed between the front end portions, A vertical beam member 414 laid between substantially the center positions of the side frames 411 in the front-rear direction, and a plurality of horizontal beam members laid between the rear frame 412 and the front frame 413 via the vertical beam member 414. 415, and is lightweight while ensuring a predetermined strength.

  The base frame body 41 is provided with a pair of side frames 411 and a first shaft 43 penetrating each horizontal rail member 415 at a position behind the vertical rail member 414, while a pair of side walls of the copying machine main body 11 is provided. 110 is formed with insertion holes 111 into which the first shaft 43 is inserted, and by inserting each end of the projecting frame body 42 into the insertion insertion holes 111, the base body 40 is The copying machine main body 11 is mounted so as to be rotatable around the first shaft 43.

  Further, the front frame 413 is installed between the upper positions of the front end portions of the pair of side frames 411, thereby facing the front end lower portions of the side frames 411 that are not in interference with the front frame 413. A base-side connection hole 416 for inserting a second shaft 31 described later is formed.

  Further, a plurality of hanging pieces 418 (FIG. 6) are provided between the pair of side frames 411 in a comb-teeth shape from the front frame 413, and a plurality of conveying pieces are conveyed to the roller shaft 417 penetrating the hanging pieces 418. A roller 46 is rotatably supported on the shaft. The sheet discharged from the fixing unit 14 (FIG. 1) in a state where the cover unit 30 is housed in the copying machine main body 11 is guided to the lower surface of the base frame 41 while being guided by the plurality of transport rollers 46. The paper is discharged toward the paper discharge tray 101 while sliding.

  The protruding frame body 42 extends forward from the upper edge of the front frame 413 of the foundation frame body 41. The projecting frame body 42 includes a rear frame 421 elongated in the width direction projecting from the front frame 413 of the base frame body 41 toward the front and obliquely upward, and the rear frame 421 slightly behind the rear frame 421. The frame includes a front frame 422 disposed in parallel with the frame 421 and a plurality of crosspieces 423 provided between the rear frame 421 and the front frame 422.

  The front frame 422 of the protruding frame body 42 is provided with a base-side operation piece 44 that protrudes upward at a central position in the longitudinal direction, and at a position corresponding to the base-side operation piece 44. A mounting opening 45 for mounting a rotating operation piece 33 described later is provided between the crosspieces 423.

  The support plate 50 is for supporting the peeling member 60, and has a support plate main body 51 that has a long rectangular shape in the width direction in a plan view, and an upper side from both sides in the width direction of the support plate main body 51. A pair of side walls 52 in the width direction formed by being bent toward the front, and a pair of brackets 53 in the width direction projecting obliquely rearward from the front edge of the support plate body 51 upward. Has been.

  The support plate main body 51 has a length dimension (dimension in the width direction) set to be the same as the length dimension of the base body 40, and the front-rear dimension is set slightly shorter than the front-rear dimension of the base body 40. Further, the side wall plate 52 is set to have substantially the same vertical dimension as the vertical dimension of the base frame body 41. A cutout portion 521 for mounting the cover unit side guide member 70 formed by cutting out from the upper edge portion is formed at the front position of each side wall plate 52.

  Each bracket 53 is set such that the outer dimension between the brackets 53 is slightly shorter than the inner dimension between the pair of side frames 411 of the base frame body 41, thereby the side frame 411 directly below the front frame 413. It can be inserted in between. Each bracket 53 is provided with a support plate side connection hole 531 facing the front end side in the width direction.

  Then, the second shaft 31 is passed through the base body side connection holes 416 and the support plate side connection holes 531 in a state where the pair of brackets 53 is fitted between the pair of side frames 411 of the foundation frame body 41. Thus, the base body 40 and the support plate 50 are connected to each other so as to be relatively rotatable around the second shaft 31.

  A locking member 32 is fixed to each end of the second shaft 31. The locking member 32 is for holding the cover unit 30 in a state of being accommodated in the copying machine main body 11, and a hook 321 that is opened forward is formed at the lower end portion. The side wall 110 of the main body 11 is provided with a locking projection 112 at a position corresponding to the hook 321, and the locking member 32 is formed on the locking projection 112 while the cover unit 30 is stored in the copying machine main body 11. By engaging, the storage state of the cover unit 30 in the copying machine main body 11 is maintained.

  A rotation operation piece 33 is fixed at the center position of the second shaft 31. The rotation operation piece 33 is formed by inserting the second shaft 31 to which the rotation operation piece 33 is fixed into the base-side connection hole 416 of the base frame body 41, so that the protruding frame body 42 of the base body 40 has the above-described structure. The size is set so as to protrude upward from the mounting opening 45 and thereby to face the base-side operation piece 44. A coil spring 34 is interposed between the turning operation piece 33 and the base-side operation piece 44, and the turning operation piece 33 and the base-side operation piece 44 are separated from each other by the biasing force of the coil spring 34. It is urged toward the direction.

  Therefore, when the hook 321 of the locking member 32 is engaged with the locking protrusion 112 of the copying machine main body 11, the rotation operation piece 33 and the substrate side operation piece 44 are grasped with fingers, so that the rotation operation piece 33 is The coil spring 34 is integrally rotated clockwise around the second shaft 31 against the urging force of the coil spring 34, and the engagement member 32 is thereby rotated clockwise so that the hook 321 is engaged with the engagement protrusion 112. Since the engagement is released, the cover unit 30 can be pulled out from the storage position by pulling upward while holding the turning operation piece 33 and the base-side operation piece 44.

  On the contrary, when the cover unit 30 is stored in the storage position, the base-side operation piece 44 may be pressed downward without gripping the rotation operation piece 33 and the base-side operation piece 44. By doing so, the inclined surface 322 formed at the lower portion of the hook 321 of the locking member 32 is brought into sliding contact with the hook 112, and the rotation of the locking member 32 in the clockwise direction against the urging force of the coil spring 34 caused thereby. Since the hook 321 is engaged with the locking projection 112 by the subsequent counterclockwise rotation, the storage state of the cover unit 30 in the copying machine main body 11 is locked.

  In such a support plate 50, a third shaft 54 is provided at a front position of each side wall plate 52 so as to project outward from a position facing each other. These third shafts 54 are guided by the fixing device side guide member 90, thereby changing the state of the cover unit 30 (the state housed in the copier body 11 and the state pulled out from the copier body 11). And the state of being accommodated in the copying machine main body 11) are smoothly performed.

  Further, a leaf spring (first urging means) 55 is fixed to each side wall plate 52 at a position behind the notch 521 by screwing or caulking. These leaf springs 55 are for biasing the cover member 80 mounted on the support plate 50 forward via the cover unit side guide member 70, and are directed forward in a curved state from the fixed position. Projected. The leaf spring 55 is configured to press the covering member 80 forward by elastic deformation caused by the covering member 80 being attached to the support plate 50 via the cover unit side guide member 70.

  The peeling member 60 is for scraping off the paper wound around the peripheral surface of the heat roller 22 in a state of being fixed to the support plate 50. The peeling member main body 61 having a rectangular shape in plan view, and the peeling member 60 It consists of a pair of left and right bent plates 62 formed by bending upward from each edge in the width direction of the member main body 61. The peeling member main body 61 is set to have a lateral width dimension slightly shorter than an internal dimension between the pair of side wall plates 52 of the support plate 50, and the front-rear dimension is a predetermined dimension from the front-rear dimension of the support plate main body 51. In such a state that the peeling member main body 61 is fixed to the support plate main body 51 with screws or the like, the front edge portion protrudes outward from the support plate main body 51. Yes.

  At the front edge of the peeling member main body 61, a plurality of peeling claws 63 whose tips are sharply tapered over the entire length are formed, and on the peripheral surface of the heat roller 22 on which the peeling claws 63 are rotating. By abutting, the paper wound around the peripheral surface of the heat roller 22 can be scraped off.

  The cover unit side guide member 70 changes the posture of the cover member 80 in accordance with a change in the state of the cover unit 30, and is screwed into the notch portion 521 formed in the side wall plate 52 of each support plate main body 51. It is fixed with a stop and others. These cover unit side guide members 70 have guide grooves 71 for guiding the third shaft 54 on the mutually opposing surfaces. The guide groove 71 includes a linear guide portion 72 extending in the front-rear direction and having a vertical dimension slightly wider than the diameter of the guided piece 84 of the covering member 80 described later, and a groove formed at the front end position of the linear guide portion 72. And a wide guide portion 73 that gradually increases in width as it goes forward.

  In the wide guide portion 73, the upper groove wall is linear in the front-rear direction following the upper groove wall of the linear guide portion 72, whereas the lower groove wall bulges into the groove. The arc wall surface 74 has been made.

  The covering member 80 covers the peripheral surface on the rear side of the heat roller 22 in a retracted position with respect to the peeling claw 63 in a state where the cover unit 30 is stored in a predetermined storage position in the copying machine main body 11. And has substantially the same planar shape as that of the peeling member 60. The covering member 80 includes a flat plate-shaped covering member main body 81, a pair of side plates 82 in the width direction formed by extending downward from respective edge portions in the left-right width direction of the covering member main body 81, and the pair of these covering members 80 An arcuate front plate 83 continuous with the covering member main body 81 is provided between the front edge portions of the side plates 82. The arc-shaped front plate 83 has an arc shape that protrudes outward in a side view.

  The linear guide portion 72 has a groove depth deeper than that of the wide guide portion 73, thereby forming a stepped portion 75 between the linear guide portion 72 and the wide guide portion 73. .

  Each side plate 82 of such a covering member 80 is provided with a guided piece 84 projecting in opposite directions. The guided piece 84 includes a first guided piece 85 provided at the rear end of the side plate 82 and a second guided piece 86 provided at a substantially central position in the front-rear direction of the side plate 82. The first guided piece 85 is formed by a portion exposed to the outside of the shaft body 851 penetrating and extending between the pair of side plates 82. The first guided piece 85 is set to have a slightly longer protruding dimension than the second guided piece 86 corresponding to the groove depth of the linear guide portion 72. Incidentally, the protruding amount of the second guided piece 86 is set corresponding to the groove depth of the wide guide portion 73.

  The cover member 80 resists the urging force of the pair of leaf springs 55 by fitting the first and second guided pieces 85 and 86 into the linear guide portion 72 of the guide groove 71. It is attached between the side guide members 70. Therefore, in a state in which the cover member 80 is mounted between the linear guide portions 72 of the cover unit side guide member 70, the cover member 80 is pressed forward by the urging force of the leaf spring 55.

  On the other hand, a stopper 211 protrudes from the side wall 210 of the fixing device main body 21 at a position corresponding to the rear of the heat roller 22, and the cover unit 30 is stored in a predetermined storage position in the copying machine main body 11. As shown in FIG. 3, the arc-shaped front plate 83 of the covering member 80 interferes with the stopper 211, so that the covering member 80 is pushed backward against the urging force of the leaf spring 55. Yes. On the other hand, when the cover unit 30 is pulled out from the predetermined storage position in the copying machine main body 11, the covering member 80 is pressed forward by the urging force of the leaf spring 55, and the first and second covered members 80 are pressed. The guide pieces 85 and 86 project forward while being guided by the guide groove 71.

  In this embodiment, a torsion coil spring (second urging means) 87 is externally fitted to the shaft body 851, and the cover member 80 is rotated around the first guided piece 85 by the urging force of the torsion coil spring 87. An urging force toward the clockwise direction is applied. Therefore, when the cover unit 30 is pulled out from the storage position in the copying machine main body 11, the cover member 80 is released from being stopped against the stopper 211, and is therefore pushed forward by the urging force of the leaf spring 55. Accordingly, the second guided piece 86 is disengaged from the linear guide portion 72 of the guide groove 71, and the first guided piece 85 abuts against the stepped portion 75 of the guide groove 71, and the first biased force of the torsion coil spring 87 causes the first By rotating clockwise around the guided piece 85, as shown in FIG. 4, the posture is set to the covering posture covering the peeling claw 63 of the peeling member 60.

  The fixing device side guide member 90 guides the cover unit 30 to change its posture between the bent posture and the extended posture when the cover unit 30 is pulled out from the copying machine main body 11 and pushed into the copying machine main body 11. In addition, the support unit 50 is positioned in a state in which the cover unit 30 is housed in the copying machine main body 11, and a pair of side walls 210 of the fixing device main body 21 are provided so as to face each other. It has been.

  The fixing device side guide member 90 is formed of a plate-like body 91 having a predetermined thickness fixed to the side wall 210, and the support plate 50 is formed to be forwardly lowered from the rear edge portion of the plate-like body 91. An arcuate guide groove 92 into which the third shaft 54 is fitted is provided. The arcuate guide groove 92 has a groove width dimension set to be slightly wider than the diameter of the third shaft 54, and a wide portion 93 set so that the groove width gradually increases rearward at the entrance portion. It is provided so that the operation of fitting the third shaft 54 into the arcuate guide groove 92 can be easily performed.

  The cover unit 30 is set to the extended posture as shown in FIG. 3 while the third shaft 54 is inserted into the groove of the arcuate guide groove 92, while the rotation operation piece 33 and the base body are set. By pulling the side operation piece 44 and pulling it upward, the third shaft 54 comes out of the arcuate guide groove 92 while being guided by the arcuate guide groove 92, and is set in a bent posture as shown in FIG. It has become.

  Hereinafter, the operation of the present invention will be described with reference to FIGS. 5 to 8 are explanatory views for explaining the operation of the present invention (first embodiment). FIG. 5 shows the cover unit 30 housed in the copying machine main body 11 and set to the extended posture. 6 shows a state in which the cover unit 30 has started to be pulled out from the copying machine main body 11, and FIG. 7 shows a state in which the cover unit 30 is bent immediately after the third shaft 54 is detached from the arcuate guide groove 92. FIG. 8 shows a state in which the cover unit 30 in the state where the pull-out operation has been completed is set to the extended posture.

  First, as shown in FIG. 5, in a state where the cover unit 30 is set in the extended posture (that is, in a state where the cover unit 30 is housed in the copying machine main body 11), the base body 40 and the support plate 50 are straight. In this state, the front end of the covering member 80 comes into contact with the stopper 211 provided on the side wall 210 of the fixing device main body 21 and is parallel to the peeling member 60 (that is, the posture is set to the retracted posture). The third shaft 54 is fitted into the rearmost end of the linear guide portion 72 and the tip of the peeling claw 63 of the peeling member 60 is in contact with the peripheral surface of the heat roller 22.

  In this state, since the hook 321 of the locking member 32 provided on the base body 40 is engaged with the locking protrusion 112 protruding from the side wall 110 of the copying machine body 11, the cover unit 30 is set. The extended posture is reliably maintained. Therefore, the paper P that is wound around the peripheral surface of the heat roller 22 when being led out from the fixing device 20 in this state is scraped off by the peeling claw 63, passes through the paper discharge conveyance path 102, and is discharged from the paper discharge tray 101. The paper is discharged.

  Next, when the cover unit 30 is pulled out from a predetermined mounting position in the copying machine main body 11 for clearing paper jams or maintenance work, the rotation operation piece 33 and the substrate side operation piece 44 are in the state shown in FIG. It is picked with a finger. Accordingly, the rotation operation piece 33 rotates clockwise around the second shaft 31, so that the locking member 32 integrally connected via the rotation operation piece 33 and the second shaft 31 is also the second shaft 31. By rotating clockwise around the hook 321, the hook 321 is disengaged from the locking projection 112, and the cover unit 30 can change its posture from the extended posture to the bent posture.

  In this state, while holding the turning operation piece 33 and the base body side operation piece 44, pulling them upward, the base body 40 turns counterclockwise around the first shaft 43 as shown in FIG. The support plate 50 is rotated around the second shaft 31 while the third shaft 54 is guided by the arcuate guide groove 92 of the fixing device side guide member 90 provided on the side wall 210 of the fixing device main body 21. The cover unit 30 is bent in a mountain fold upward from the central portion in the front-rear direction.

  At this time, since the cover member 80 is pressed forward by the urging force of the leaf spring 55 provided on the support plate 50, the first and second guided pieces 85, 85 provided on the cover member 80, 86 is moved forward relative to the peeling member 60 while being guided by the guide groove 71 of the cover unit side guide member 70 provided on the support plate 50.

  As shown in FIG. 7, in a state where the third shaft 54 of the support plate 50 is disengaged from the arcuate guide groove 92 of the fixing device side guide member 90, the second guided piece 86 slips forward from the guide groove 71. At the same time, the first guided piece 85 is positioned at the forefront portion of the linear guide portion 72 of the guide groove 71 and is in contact with the stepped portion 75. In this state, the covering member 80 is rotated clockwise around the first guided piece 85 by the urging force of the torsion coil spring 87, and thereby the peeling claw 63 of the peeling member 60 from the retracted posture parallel to the peeling member 60. Change the posture to the covering posture that covers.

  Subsequently, the rotation operation of the base body 40 around the first axis 43 while holding the rotation operation piece 33 and the base-side operation piece 44 is continued until the end, and the support plate 50 is further moved to the first position. The cover unit 30 is brought into an upright state on the first shaft 43 as shown in FIG. Even in this state, the tip of the peeling claw 63 is covered with the arc-shaped front plate 83 of the covering member 80, so that the hand is placed in the space formed at the rear position of the fixing device 20 for maintenance work. Even if it is inserted, it is possible to reliably prevent inconvenience that the peeling claw 63 is damaged by a tool held in the hand.

  FIG. 9 is an exploded perspective view showing a second embodiment of the cover unit 30 ′. 10 and 11 are assembled perspective views of the cover unit 30 shown in FIG. 9. FIG. 10 shows a state in which the cover unit 30 is stored in the storage position in the copying machine main body 11, and FIG. A state in which the unit 30 is pulled out from the storage position of the copying machine main body 11 is shown. 9 to 11, the XX direction is referred to as the width direction, and the YY direction is referred to as the front-rear direction. In particular, the -X direction is leftward, the + X direction is rightward, the -Y direction is forward, and the + Y direction is forward. It is called the back.

  The second embodiment is different from the first embodiment in that a protective cover 88 is provided at the lower part of the cover member 80 and an annular guide member 70 'is employed as a guide member on the cover unit side. Yes. The protective cover 88 includes a flat plate portion 881 provided between the side wall plates 52 of the support plate 50 and an inclined plate portion 882 extending in a state of being inclined downward from the front edge portion of the flat plate portion 881. ing.

  The annular guide member 70 ′ has a guide hole 76 that has a length dimension substantially the same as the longitudinal dimension of the protective cover 88 and extends in the longitudinal direction. In a state where the annular guide member 70 ′ is fixed on both ends in the width direction of the flat plate portion 881 of the protective cover 88, each end portion of the shaft body 851 of the covering member 80 is penetrated into each guide hole 76. Thus, the covering member 80 can move back and forth while being guided by the annular guide member 70 '. The plate spring 55 that presses the cover member 80 forward is provided on the flat plate portion 881 of the protective cover 88.

  The stopper 211 is provided at a position facing the shaft body 851 on the side wall 210 of the fixing device main body 21, and interferes with the shaft body 851 in a state where the cover unit 30 is stored in the storage position. In the second embodiment, the second guided piece 86 of the first embodiment is not provided. Other configurations of the cover unit 30 ′ of the second embodiment are the same as those of the first embodiment except for the dimension.

  12A and 12B are perspective views for explaining the operation of the posture changing structure of the covering member 80. FIG. 12A is a state in which the covering member 80 is set to the retracted posture, and FIG. Each of the states set to the covering posture is shown. According to the cover unit 30 ′ of the second embodiment, when the cover unit 30 ′ is stored in the storage position (FIG. 10), the shaft body 851 is relative to the stopper 211 as shown in FIG. By being pressed, it moves to the rear end position of the guide hole 76 of the annular guide member 70 ′, so that the cover member 80 is covered with the protective cover 88.

  In this state, when the rotary operation piece 33 and the base-side operation piece 44 are gripped and lifted upward, the support plate 50 is retracted, so that the shaft body 851 is pressed by the leaf spring 55 in the guide hole 76 and is relatively moved. Forward and reaches the front end of the guide hole 76. When the shaft body 851 reaches the front end of the guide hole 76, the covering member 80 is rotated clockwise around the shaft body 851 by the urging force of the torsion coil spring 87 (FIG. 2). As shown in (b), the tip of the peeling claw 63 is covered.

  As described in detail above, the fixing device 20 according to the present invention heats the paper P on which the toner image has been transferred to a predetermined copying machine body 11 while heating the paper P while being rotated about its axis. A heat roller 22 for fixing the toner image and a paper discharge side peripheral surface of the heat roller 22 by covering the heat roller 22 by being stored in a storage position in the copying machine main body 11, while being pulled out from the storage position. And a cover unit 30 that secures a space for maintenance on the paper discharge side. The cover unit 30 includes a peeling member 60 that peels off the paper P wound around the heat roller 22; A covering member 80 is provided to cover the peeling member 60. The covering member 80 is connected to the tip of the peeling member 60 in a state where the cover unit 30 is stored in the copying machine main body 11. While the posture set in the saved retracted position, so that the cover unit 30 is the posture set in the coating position covering the tip of the peeling member 60 in a state of being pulled out from the copying machine main body 11.

  By adopting such a configuration, the cover member 80 is set in a retracted position in which the cover unit 30 is retracted from the front end of the peeling member 60 in a state where the cover unit 30 is accommodated in the copying machine main body 11, and thus the rotating heat roller The paper P wound around the paper 22 is peeled off by the peeling member 60 in contact with the peripheral surface of the heat roller 22 and then discharged to the outside through the cover unit 30, while the cover unit 30 is used for maintenance work. In the state of being pulled out from the copying machine main body 11, the covering posture is set so as to cover the tip of the peeling member 60, so that even if the operator puts his hand into the space formed on the downstream side of the heat roller 22, the hand is peeled The tip of the member 60 can be prevented from hitting.

  Thus, since the covering member 80 can ensure higher safety by covering the peeling member 60 in a state where it wraps around the tip of the peeling member 60, the covering member 80 is simply attached to the tip of the conventional peeling member 60. Since the paper jam clearing work and the maintenance work can be performed without paying attention to the peeling member 60 as compared with the cover member 80 that only moves in parallel, the work efficiency of these work can be greatly improved.

  The cover unit 30 is provided with a cover unit side guide member 70 (annular guide member 70 ′ in the second embodiment) that guides the posture change of the cover member 80, while the cover member 80 includes the cover unit 80. First and second guided pieces 85 and 86 that are guided by the side guide member 70 and move forward and backward are provided. The cover member 80 rotates around the first guided piece 85 in a state where the second guided piece 86 is detached from the cover unit side guide member 70 by the cover unit 30 being pulled out from the copying machine main body 11. In order to change the posture from the retracted posture to the covering posture, the cover member 80 that is set in the retracted posture retracted from the peeling member 60 when the cover unit 30 is housed in the copying machine main body 11 is provided in the cover unit 30. The cover unit 30 is moved with respect to the copier main body 11 such that the first guide piece is guided to the cover unit side guide member 70 to change the posture so as to cover the tip of the peeling member 60. It is possible to cause the covering member 80 to change the posture by one operation of inserting and removing the cover. It is possible to easily perform the change operation.

  As described above, by adopting a configuration in which the first guide piece is guided by the cover unit side guide member 70, the posture changing structure of the covering member 80 can be simplified. This can contribute to a reduction in manufacturing costs.

  Further, the cover unit side guide member 70 of the first embodiment has a guide groove 71 that guides the forward and backward movement of the guided piece 84, and the guide groove 71 includes a linear guide portion 72, a wide guide portion 73, and the like. The second guided piece 86 is provided at a position where the cover member 80 can be rotated around the first guide piece by being removed from the linear guide portion 72. Both the guide piece 85 and the second guided piece 86 can move straight by being guided by the linear guide portion 72, and the second guided piece 86 is disengaged from the linear guide portion 72. Only the first guided piece 85 exists in the linear guide portion 72, and the covering member 80 can rotate around the first guided piece 85 in this state. Between It is possible to energize change.

  As described above, by causing the linear guide portion 72 to guide the first and second guided pieces 86, the posture changing structure of the covering member 80 can be simplified, and thereby the covering member 80 can be simplified. This can contribute to a reduction in manufacturing cost of the posture changing structure.

  On the other hand, the annular guide member 70 ′ of the second embodiment guides the shaft body 851 only by the guide hole 76 through which the shaft body 851 passes, so that the guide structure can be further simplified. .

  The cover member 80 includes a leaf spring 55 that urges the cover member 80 toward the heat roller 22, and a torsion coil spring 87 that urges the cover member 80 to rotate toward the peeling member 60. The copying machine main body 11 regulates the protrusion of the covering member 80 from the linear guide portion 72 in a state where the cover unit 30 is accommodated in the copying machine main body 11, while the cover unit 30 is connected to the copying machine main body 11. Since the stopper 211 that allows the cover member 80 to protrude from the linear guide portion 72 in the state of being pulled out from the main body 11 is provided, the leaf spring 55 can be used when the cover unit 30 is stored in the copier main body 11. The cover member 80 urged toward the heat roller 22 is regulated by a stopper 211 provided in the cover unit 30, thereby the heat roller Never collide with the 2. On the other hand, when the cover unit 30 is pulled out from the copying machine main body 11, the cover member 80 is released toward the heat roller 22 by the urging force of the leaf spring 55 because the restriction by the stopper 211 is released. At the same time, the peeling claw 63 of the peeling member 60 can be covered with the covering member 80 by rotating around the first guided piece 85 by the biasing force of the torsion coil spring 87.

  The copying machine 10 includes the fixing device 20 having the cover unit 30, the base body 40, the support plate 50, the peeling member 60, the cover unit side guide member 70, and the cover member 80 as described above. It will be rich.

  The present invention is not limited to the above embodiment, and includes the following contents.

  (1) In the above embodiment, the leaf spring 55 is employed as the first urging means for urging the cover member 80 toward the heat roller 22, but in the present invention, the first urging means is a plate. It is not limited to the spring 55, and may be a coil spring.

  (2) In the above embodiment, by attaching the peeling member 60 in which a plurality of peeling claws 63 are integrally formed on the distal end side of the peeling member main body 61 to the support plate 50, the peeling claws 63 are all at once. Although it is made to attach to the support plate 50, you may make it attach directly to the support plate 50 by screwing etc. one by one instead of employ | adopting the peeling member 60 instead of doing this.

  (3) In the above embodiment, the cover unit side guide member 70 is separated from the support plate 50 and is attached to each side wall plate 52 of the cover unit side guide member 70. The cover unit side guide member 70 may be formed integrally with the side wall plate 52.

  (4) In the above embodiment, the locking member 32 and the locking member 32 are operated in order to maintain the setting posture of the cover unit 30 set in the extended posture by being mounted in the copying machine main body 11. The rotation operation piece 33 is provided. However, if the extended posture of the cover unit 30 is maintained by the weight of the base body 40, the support plate 50, etc., the locking member 32 and the rotation operation piece 33 are particularly provided. It does not have to be. By doing so, it is possible to contribute to the reduction in the number of parts of the cover unit 30.

1 is a schematic explanatory view in cross section showing an embodiment of an internal structure of a copying machine according to the present invention. It is a disassembled perspective view which shows 1st Embodiment of a cover unit. FIG. 3 is an assembled perspective view of the cover unit shown in FIG. 2, showing a state where the cover unit is stored in a storage position in the apparatus main body. FIG. 3 is an assembled perspective view of the cover unit shown in FIG. 2, showing a state in which the cover unit is pulled out from the storage position of the apparatus main body. FIG. 5 is an explanatory diagram for explaining the operation of the present invention, and shows a state in which the cover unit is housed in the copying machine main body and set in the extended posture. FIG. 5 is an explanatory diagram for explaining the operation of the present invention, and shows a state in which the cover unit is started to be pulled out from the copying machine main body. It is explanatory drawing for demonstrating the effect | action of this invention, and has shown the state which the cover unit was in the bending attitude | position immediately after the 3rd axis | shaft removed from the circular arc guide groove. It is explanatory drawing for demonstrating the effect | action of this invention, and has shown the state by which the cover unit of the state which drawer operation was completed was set to the expansion | extension attitude | position. It is a disassembled perspective view which shows 2nd Embodiment of a cover unit. FIG. 10 is an assembled perspective view of the cover unit shown in FIG. 9 and shows a state in which the cover unit is stored in a storage position in the copying machine main body. FIG. 10 is an assembled perspective view of the cover unit shown in FIG. 9 and shows a state in which the cover unit is pulled out from the storage position of the copying machine main body. It is a perspective view for demonstrating the effect | action of the attitude | position change structure of a cover member, (A) is the state in which the cover member was set to the retracted attitude, and (B) is the attitude set to the cover attitude of the cover member Each state is shown.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Copy machine (image forming apparatus) 101 Paper discharge tray 102 Paper discharge conveyance path 103 Return conveyance path 110 Side wall 111 Insertion hole 112 Locking protrusion 11 Copier main body (apparatus main body)
DESCRIPTION OF SYMBOLS 12 Document reading part 121 Document holder 122 Optical system unit 123 Contact glass 123a Placed document contact glass 123b Automatic feeding contact glass 124 Operation panel 125 Document tray 126 Document delivery tray 127 Document feeding part 13 Image forming part 13Y For yellow Unit 13M Magenta unit 13C Cyan unit 13K Black unit 131 Photosensitive drum 132 Developing device 133 Charging unit 134 Exposure unit 135 Cleaning device 136 Conveying belt 137 Driving roller 14 Fixing unit 15 Paper storage unit 151 Paper tray 152 Pickup roller 153 Supply Paper transport path 16 Paper reversing unit 161 Intermediate tray 162 Switching guide 163 Reverse roller pair 20 Fixing device 21 Fixing device body 210 Side wall 211 Stopper 22 Heat Roller 23 Pressure roller 30, 30 'Cover unit 31 Second shaft 32 Locking member 321 Hook 322 Inclined surface 33 Rotating operation piece 34 Coil spring 40 Base 41 Base frame body 411 Side frame 412 Rear frame 413 Front frame 414 Vertical beam 415 Horizontal beam 416 Base side connection hole 417 Roller shaft 418 Hanging piece 42 Projection frame 421 Rear frame 422 Front frame 423 Bar material 43 First shaft 44 Base side operation piece 45 Mounting opening 46 Conveying roller 50 Support Plate 51 Support plate body 52 Side wall plate 521 Notch 53 Bracket 531 Support plate side connection hole 54 Third shaft 55 Leaf spring (first biasing means)
60 peeling member 61 peeling member main body 62 bent plate 63 peeling claw 70 cover unit side guide member 70 ′ annular guide member 71 guide groove 72 linear guide portion 73 wide guide portion 74 arc wall surface 75 stepped portion 80 covering member 81 covering member main body 82 Side plate 83 Arc-shaped front plate 84 Guided piece 85 First guided piece 851 Shaft body 86 Second guided piece 87 Torsion coil spring (second biasing means)
88 Protective cover 881 Flat plate portion 882 Inclined plate portion 90 Fixing device side guide member 91 Plate body 92 Arc-shaped guide groove 93 Wide portion

Claims (5)

A heat roller for fixing the toner image on the paper by heating the paper on which the toner image has been transferred to a predetermined device main body while being rotated about its axis, and being stored in a storage position within the device main body. And a fixing unit that covers the peripheral surface of the heat roller on the paper discharge side and is attached to a cover unit that secures a space for maintenance on the paper discharge side of the heat roller by being pulled out from the storage position. Because
The cover unit includes a peeling member that peels off the paper wound around the heat roller, and a covering member that covers the peeling member,
The cover member is set in a retracted position in which the cover unit is retracted from the tip of the peeling member in a state where the cover unit is housed in the apparatus main body, while the cover member is in a state in which the cover unit is pulled out from the apparatus main body. A fixing device configured to be set to a covering posture covering a front end.   The cover unit includes a guide member that guides the posture change of the cover member, and the cover member includes a first guided piece that moves forward and backward while being guided by the guide member. When the unit is pulled out from the apparatus main body, the cover unit is accommodated in the apparatus main body while the cover attitude is set by rotation around the first guided piece in a state of being positioned on the distal end side of the guide member. The fixing device according to claim 1, wherein the first guided piece is configured to be set in the retracted position by being positioned on a proximal end side of the guide member.   The guide member includes a linear guide portion substantially parallel to the peeling member, and the cover member includes a second guided piece guided by the linear guide portion in addition to the first guided piece. 3. The fixing according to claim 2, wherein the second guided piece is provided at a position where the covering member can be rotated around the first guide piece by detaching from the linear guide portion. apparatus.   A first urging unit that urges the covering member toward the heat roller; and a second urging unit that urges the covering member to rotate toward the peeling member; The cover unit restricts the protrusion of the cover member from the linear guide portion in the state where the cover unit is housed in the apparatus main body, while the straight line of the cover member is in a state where the cover unit is pulled out from the apparatus main body. The fixing device according to claim 3, further comprising a stopper that allows protrusion from the guide portion.   An image forming apparatus comprising the fixing device according to claim 1, wherein the image forming apparatus has an image forming unit that forms a toner image on a fed sheet, and the sheet is discharged from the image forming unit. An image forming apparatus configured to feed the formed sheet to the fixing device.

Images