JP2009216871A - Image forming device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image forming device for effectively using a space by rotating a transfer unit and a door panel on the same rotation shaft. <P>SOLUTION: When a user rotates a panel 72 about the rotation shaft 74 and opens it, a secondary transfer unit 70 connected to a door panel 72 through a coupling device 90 is also rotated and opened by the same rotation shaft 74 as that of the door panel 72. When the door panel 72 is opened to an opened position, a projection 102 of a lever member 100 pushes a press board 96 to release the coupling device 90. Only the secondary transfer unit 70 can be rotated by releasing the coupling device 90, and thus a sheet member P jammed between the secondary transfer unit 70 and the door panel 72 is removed. Thus, the door panel 72 and the secondary transfer unit 70 are rotated about the rotation shaft 74, and the coupling device 90 can be released at the opened position of the door panel 72. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an image forming apparatus that forms an image on a conveyed sheet member.

  Patent Document 1 describes a transfer unit that is disposed to face an image forming unit. The transfer unit is rotatably attached to the main body in order to open the space between the image forming unit and the transfer unit. Further, a door panel is provided that protects the transfer unit, is connected to the transfer unit by a connecting means, and is rotated and opened by a rotation shaft different from the transfer unit.

  Specifically, when the user opens the door panel, the transfer unit connected to the door panel by the connecting means also rotates. As a result, the space between the image forming unit and the transfer unit is opened.

  Here, as described above, the door panel and the transfer unit rotate around different rotation axes. For this reason, the relative position of the door panel and the transfer unit rotates while being shifted, and when the door panel is opened to a predetermined opening degree, the connecting means is released by utilizing this relative positional shift.

The transfer unit and the door panel can be opened by rotating the transfer unit alone in a state where the connecting means is released.
JP 2007-47571 A

  The present invention makes it possible to effectively utilize the space by rotating the transfer unit and the door panel (opening / closing member) on the same rotation shaft, and to release the connection between the transfer unit and the opening / closing member at the open position of the opening / closing member. It is a problem.

  An image forming apparatus according to a first aspect of the present invention includes an image forming unit that forms an image, and a transfer position that is disposed to face the image forming unit and transfers the image formed by the image forming unit to a recording medium. A recording medium conveyance path is formed between the transfer unit and a transfer unit that moves between a non-transfer position that rotates about the first rotation axis with respect to the main body and moves away from the image forming unit, An opening / closing member that moves between a closing position that rotates around the first rotation axis and closes the opening of the main body and an opening position that opens the opening, and connects the opening / closing member and the transfer unit. And a release means for releasing the connection means until the opening / closing member reaches the open position, and allowing the transfer unit to rotate independently.

  An image forming apparatus according to a second aspect of the present invention is the image forming apparatus according to the first aspect, wherein the connecting means is provided on an engagement member provided on the transfer unit and on the opening / closing member, and is applied to the engagement member. An engagement member, and the release means is provided on the opening and closing member, a lever member rotatably attached to the main body by a second rotation shaft different from the first rotation shaft, A holding means for movably holding an operation portion provided at the other end of the lever member, and the engagement by moving the operation portion of the lever member until the opening / closing member reaches the open position. A moving force conversion member that moves the member to disengage it from the engaging member.

  The image forming apparatus according to a third aspect of the present invention is the image forming apparatus according to the second aspect, wherein the operation portion is a protrusion protruding from the other end, and the moving force conversion member is the protrusion that moves. The holding member provided in the opening / closing member is a holding member formed with a long hole that movably holds the protrusion. And

  An image forming apparatus according to a fourth aspect of the present invention is the image forming apparatus according to any one of the first to third aspects, wherein the image forming apparatus is attached to at least one of the opening / closing member and the transfer unit, and is connected to the transfer unit by the connecting means. The fixing member that fixes the opening and closing member that has been moved to the closed position to the main body, and the fixing by the fixing member is released, and the opening and closing member that is disposed at the closed position can be rotated to the open position. And a fixing release member.

  An image forming apparatus according to a fifth aspect of the present invention is the image forming apparatus according to the first aspect, wherein the release means is movably supported by a cam provided on the rotating shaft and the opening / closing member, and one end thereof is biased A moving member biased by the member to the cam surface of the cam, and the cam surface moves the other end of the moving member when the opening / closing member moves to the open position, and releases the connecting means. It is characterized by being formed.

  According to the configuration of the first aspect of the present invention, the transfer unit and the opening / closing member can be rotated by the same rotation shaft as compared with the configuration in which the rotation shafts of the transfer unit and the opening / closing member are different, and space is effectively used. In addition, the transfer unit and the opening / closing member can be disconnected at the opening position of the opening / closing member.

  According to the configuration of the second aspect of the present invention, the moving force of the operation unit can be used as compared with the configuration in which the operation unit does not have a lever member that is movably held, and the engaged portion can be engaged with a simple configuration. The mating member can be removed from the engaging member.

  According to the structure of Claim 3 of this invention, compared with the structure which does not have the holding member in which the long hole was formed, the protrusion part of a lever member can be hold | maintained movably with a simple structure. .

  According to the structure of Claim 4 of this invention, compared with the case where it does not have this structure, a fixing member can be cancelled | released easily and an opening-and-closing member can be opened.

  According to the structure of Claim 5 of this invention, compared with the structure which does not have a cam, a moving member can be moved according to the shape of the cam surface of a cam, and it can cancel | release a connection means easily. it can.

An example of the image forming apparatus according to the first embodiment of the present invention will be described below with reference to FIGS.
(overall structure)
As illustrated in FIG. 12, an IPS (Image Processing System) 12 that performs predetermined image processing on input image data is provided in the main body 10 </ b> A of the image forming apparatus 10.

  Further, an exposure device 14 is provided for receiving data converted into original reproduction color material gradation data of four colors of yellow (Y), magenta (M), cyan (C), and black (K) by the IPS 12. The exposure device 14 performs image exposure with the laser beam LB.

  Further, four image forming units 16Y, 16M, 16C, and 16K of yellow (Y), magenta (M), cyan (C), and black (K) are arranged above the exposure device 14 at a certain interval in the horizontal direction. Is arranged.

  These four image forming units 16Y, 16M, 16C, and 16K are all configured in the same manner, and the photosensitive drum 18 as an image carrier that is rotationally driven at a predetermined speed, and the surface of the photosensitive drum 18 The charging roll 20 for primary charging that uniformly charges the above and the above-described exposure apparatus as an image exposure apparatus that forms an electrostatic latent image by exposing an image corresponding to a predetermined color on the surface of the photosensitive drum 18. 14, a developing unit 22 that develops the electrostatic latent image formed on the photosensitive drum 18 with toner of a predetermined color, and a cleaning device 24 that cleans the surface of the photosensitive drum 18. These photosensitive drums 18 and image forming members disposed in the periphery are integrally unitized, and are configured to be individually replaceable from the main body 10A of the image forming apparatus 10.

  Further, four semiconductor lasers (not shown) configured in common to the four image forming units 16Y, 16M, 16C, and 16K are provided. From these semiconductor lasers, laser beams LB-Y, LB-M, and LB- C and LB-K are emitted according to the gradation data.

  The laser beams LB-Y, LB-M, LB-C, and LB-K emitted from the semiconductor laser are irradiated to the polygon mirror 26 through an unillustrated f-θ lens, and are deflected and scanned by the polygon mirror 26. Is done. The laser beams LB-Y, LB-M, LB-C, and LB-K deflected and scanned by the polygon mirror 26 are used as exposure points on the photosensitive drum 18 through an imaging lens (not shown) and a plurality of mirrors. Then, scanning exposure is performed obliquely from below.

  Since the exposure device 14 scans and exposes an image on the photosensitive drum 18 from below, the exposure device 14 includes four image forming units 16Y, 16M, 16C, and 16K located above. There is a risk that toner or the like may fall from 22 and be contaminated. Therefore, the exposure apparatus 14 is hermetically sealed by a rectangular parallelepiped frame 28, and four laser beams LB-Y, LB-M, LB-C, and LB-K are placed on the upper portion of the frame 28. Transparent glass windows 30Y, 30M, 30C, and 30K are provided as shield members for exposure on the photosensitive drums 18 of the image forming units 16Y, 16M, 16C, and 16K.

  Further, from the IPS 12, an exposure apparatus 14 provided in common for the image forming units 16Y, 16M, 16C, and 16K of each color of yellow (Y), magenta (M), cyan (C), and black (K) is provided. Image data of each color is sequentially output, and the laser beams LB-Y, LB-M, LB-C, and LB-K emitted from the exposure device 14 according to the image data are applied to the surface of the corresponding photosensitive drum 18. Scanning exposure is performed to form an electrostatic latent image. The electrostatic latent image formed on the photosensitive drum 18 is converted into yellow (Y), magenta (M), cyan (C), and black (K) colors by the developing units 22Y, 17M, 17C, and 17K, respectively. Developed as a toner image.

  Further, four primary transfer rolls 34Y, 34M, 34C, and 34K are provided on the intermediate transfer belt 32 of the primary transfer unit 21 disposed over the image forming units 16Y, 16M, 16C, and 16K. Then, yellow (Y), magenta (M), cyan (sequentially formed on the photosensitive drums 18 of the image forming units 16Y, 16M, 16C, 16K by the four primary transfer rolls 34Y, 34M, 34C, 34K. C) and black (K) toner images are transferred onto the intermediate transfer belt 32 in a multiple manner.

  The primary transfer rolls 34Y, 34M, 34C, and 34K are connected to a transfer bias power source (not shown), and a transfer bias having a polarity opposite to a predetermined toner polarity (positive polarity in the present embodiment) is provided. It is applied at a predetermined timing.

  Further, the intermediate transfer belt 32 is wound around the drive roll 36, the tension roll 38, and the backup roll 40 with a constant tension. Then, it is circulated and driven at a predetermined speed in the direction of the arrow by a drive roll 36 that is rotationally driven by a dedicated drive motor excellent in constant speed (not shown).

  On the other hand, the yellow (Y), magenta (M), cyan (C), and black (K) toner images transferred onto the intermediate transfer belt 32 in multiple contact with the backup roll 40 and the secondary transfer unit 70. The sheet member P that has been secondarily transferred onto the sheet member P serving as a recording medium by the pressing force and the electric field by the secondary transfer roll 42 that constitutes the toner image is transferred to the fixing device 44 positioned above. It is conveyed. The sheet member P on which the toner image of each color is transferred is subjected to a fixing process by heat and pressure by the fixing device 44 and then discharged to a discharge tray 48 provided on the upper portion of the main body 10A of the image forming apparatus 10 by a discharge roll 46. It becomes the composition which is done. Details of the secondary transfer unit 70 will be described later.

  A sheet feeding cassette 50 on which the sheet members P are stacked is provided on the lower side in the main body 10A of the image forming apparatus 10, and the sheet members P stacked on the sheet feeding cassette 50 are connected to the sheet feeding roller 52 and the sheet separation. The paper is transported to the registration roll 58 provided in the secondary transfer unit 70 by the transport roller 54 via the paper transport path 56 and stopped. The sheet member P supplied from the sheet feeding cassette 50 is sent to the secondary transfer position of the intermediate transfer belt 32 by a registration roll 58 that rotates at a predetermined timing.

  Further, when images are formed on both sides of the sheet member P, the sheet member P, on which the image is fixed on one side by the fixing device 44, is not directly discharged onto the discharge tray 48 by the discharge roll 46, but a switching gate (not shown). To switch the transport direction and transport the paper to the duplex transport path 62 via the paper transport roller 60. Then, the sheet member P is conveyed again to the resist roll 58 with the conveyance roller (not shown) provided along the conveyance path 62 for both sides turned upside down, and this time, the back surface of the sheet member P 2. Then, after the image is transferred and fixed, it is discharged onto the discharge tray 48.

On the other hand, on the upper side of the main body 10A, toner cartridges 64Y, 64M for supplying toner of a predetermined color to the developing devices 22 of each color of yellow (Y), magenta (M), cyan (C), and black (K), 64C and 64K are provided.
(Main part configuration)
Next, the secondary transfer unit 70 and the like will be described.

  As described above, the secondary transfer unit 70 includes the secondary transfer roll 42, the resist roll 58, and the like. Further, a door panel 72 serving as an opening / closing member that opens the opening 10B of the image forming apparatus 10 can be opened / closed around the rotation shaft 74 at a position facing the secondary transfer unit 70 across the double-sided conveyance path 62. Is provided.

  As shown in FIG. 11, the secondary transfer unit 70 is also configured to rotate about the same rotation shaft 74 as the door panel 72, and is connected to the door panel 72 and the door panel 72 connected by the connecting device 90 (see FIG. 1). The next transfer unit 70 is integrally rotated from the main body 10A. Details of the connecting device 90 will be described later.

  Further, hook members 76 having bent end portions for fixing the secondary transfer unit 70 and the door panel 72 connected to each other by the connecting device 90 to the main body 10 </ b> A of the image forming apparatus 10 are provided on both side surfaces of the secondary transfer unit 70. Yes. Specifically, a rotation shaft 78 extending in the sheet material conveyance orthogonal direction and penetrating through the secondary transfer unit 70 is rotatably provided, and hook members 76 are fixed to both ends of the rotation shaft 78. The main body 10 </ b> A of the image forming apparatus 10 is provided with a cylindrical hooking member 80 on which the hook member 76 is hooked.

  Further, a handle member 82 for rotating the rotary shaft 78 is fixed to the rotary shaft 78 to which the hook member 76 is fixed, and the handle member 82 is formed on the door panel 72. It is exposed to the outside through the formed opening 72A. The rotating shaft is provided with a torsion spring (not shown), and the hook member 76 is urged by the torsion spring so as to be engaged with the hooking member 80 at a predetermined position.

  That is, when the user rotates the handle member 82 in the arrow A direction shown in FIG. 11, the hook member 76 rotates in the arrow B direction, and the hook member 80 and the hook member 76 are released. When the hook member 76 is released, the secondary transfer unit 70 and the door panel 72 are opened in the arrow C direction. A string-like stopper member 84 (see FIG. 1) is provided so as to connect the door panel 72 and the main body 10A of the image forming apparatus 10, and the secondary transfer unit 70 and the door panel 72 opened in the direction of arrow C are It stops at an angle determined by the stopper member 84.

  As shown in FIG. 1, a connecting device 90 that connects the secondary transfer unit 70 and the door panel 72 includes an L-shaped engagement member 92 provided in the secondary transfer unit 70, and the engagement member 92. It is comprised from the plate-shaped slide member 94 as a to-be-engaged member provided with the rectangular-shaped opening part 94A to hang.

  Specifically, as shown in FIG. 4, the engaging member 92 is integrally provided in a convex shape on the back surface (the surface facing the door panel 72) of the secondary transfer unit 70. Further, the slide member 94 provided with the opening 94A on which the engaging member 92 is engaged is movable on the door panel 72 via a mounting portion (not shown) so as to be movable in the sheet material conveyance orthogonal direction (arrow D direction shown in FIG. 4). Attached. An urging member (not shown) is provided at the end of the slide member 94, and the slide member 94 is urged in a direction in which an opening 94A provided in the slide member 94 is engaged with the engaging member 92.

  Further, a plate-like pressing plate 96 is provided at one end of the slide member 94. The pressing plate 96 is provided with a plate-like fixed surface portion 96A that is fixed to one end of the slide member 94 and extends in the vertical direction, and an inclined surface portion 96B that is provided at the upper end of the fixed surface portion 96A and bends and extends from the fixed surface portion 96A. It has been.

  On the other hand, a long plate-like lever member 100 whose one end is rotatably supported around the shaft portion 98 is provided on the main body 10 </ b> A of the image forming apparatus 10, and is provided at the other end of the lever member 100. Further, the tip of the cylindrical protrusion 102 comes into contact with the inclined surface 96B of the pressing plate 96.

  Specifically, the protrusion 102 provided at the other end of the lever member 100 is a length formed on the plate-like rail member 104 provided on the back surface (the surface facing the secondary transfer unit 70) of the door panel 72. The hole 104A is movably fitted. And the front-end | tip part of the projection part 102 which protruded on the opposite side on both sides of the rail member 104 contacts the inclined surface part 96B.

  As shown in FIG. 1, a secondary transfer unit 70 is disposed at a transfer position where the secondary transfer roll 42 contacts the intermediate transfer belt 32 (see FIG. 12) and forms an image on the sheet member P. When the door panel 72 connected to the connecting device 90 by the connecting device 90 is disposed at the closed position that covers the secondary transfer unit 70, the tip end portion of the protruding portion 102 and the inclined surface portion 96B come into contact with each other. As shown in FIGS. 7A and 8A, in this state, the opening 94A of the slide member 94 is engaged with the engaging member 92.

  As shown in FIG. 2, when the hook member 76 is released and the secondary transfer unit 70 and the door panel 72 connected by the connecting device 90 (see FIG. 4) are opened around the rotation shaft 74, the lever member 100. The projecting portion 102 provided in is moved in the elongated hole 104 </ b> A formed in the rail member 104.

  As shown in FIG. 5, when the protruding portion 102 moves in the elongated hole 104A, the protruding portion 102 presses the inclined surface portion 96B in the sheet material conveyance orthogonal direction (the direction of arrow E shown in FIG. 5).

  As shown in FIG. 3, when the secondary transfer unit 70 and the door panel 72 are stopped by the stopper member 84, the secondary transfer unit 70 is moved to the non-transfer position away from the intermediate transfer belt 32, and the door panel 72 is moved to the non-transfer position. It moves to the open position that supports the moved secondary transfer unit 70.

As shown in FIG. 6, the protrusion 102 that has moved through the long hole 104 </ b> A passes through the inclined surface portion 96 </ b> B of the pressing plate 96 and reaches the fixed surface portion 96 </ b> A. That is, the slide member 94 is pushed by the protrusion 102 through the pressing plate 96, and as a result, as shown in FIGS. 7A, 7B, and 8C. In addition, the opening 94 </ b> A of the slide member 94 is moved, and the engaging member 92 is disengaged from the opening 94.
(Function)
For example, when there is a warning or the like notifying that the sheet member P has jammed in the paper conveyance path 56 or the double-side conveyance path 62 shown in FIG. 12, the user opens the door panel 72 as shown in FIG. The handle member 82 protruding from the portion 72A is rotated in the arrow A direction.

  When the handle member 82 is rotated in the direction of arrow A, the hook members 76 provided on both side surfaces of the secondary transfer unit 70 are rotated in the direction of arrow B and detached from the hooking member 80.

  The secondary transfer unit 70 disposed at the transfer position, and the door panel 72 that is coupled to the secondary transfer unit 70 by the coupling device 90 and disposed at the closed position can rotate about the rotation shaft 74.

  Then, the user opens the secondary transfer unit 70 and the door panel 72 in the direction of arrow C. As shown in FIGS. 9 and 10, the secondary transfer unit 70 and the door panel 72 are at an angle determined by the stopper member 84. Stop at. Thus, the secondary transfer unit 70 moves to a non-transfer position away from the intermediate transfer belt 32 (see FIG. 12), and the door panel 72 moves to an open position that supports the secondary transfer unit 70 arranged at the non-transfer position. .

  When the secondary transfer unit 70 and the door panel 72 are opened, a protrusion 102 provided at the other end of the lever member 100 is formed on the rail member 104 as shown in FIGS. 4, 5, and 6. It moves from one end in the elongated hole 104A toward the other end.

  When the protrusion 102 moves from one end to the other end in the elongated hole 104A, the tip of the protrusion 102 presses the inclined surface portion 96B of the pressing plate 96, and the slide member 94 fixed to the pressing plate 96 is Then, it moves in the sheet material conveyance orthogonal direction (arrow E direction shown in FIG. 5). When the tip end portion of the protruding portion 102 passes through the inclined surface portion 96B and reaches the fixed surface portion 96A, the slide member 94 stops.

  When the slide member 94 is moved, the engagement member 92 is moved to the opening portion 94A of the slide member 94 as shown in FIGS. 7 (A), (B), (C) and FIGS. 8 (A), (B), and (C). Deviate from. That is, the engaging member 92 is configured to be disengaged from the opening portion 94 </ b> A of the slide member 94 before the door panel 72 reaches the open position.

  On the other hand, as described above, by moving the door panel 72 from the closed position to the open position, the secondary transfer unit 70 connected to the door panel 72 by the connecting device 90 moves to the non-transfer position away from the intermediate transfer belt 32. To do. Therefore, the user removes the sheet member P jammed in the sheet conveyance path 56 between the secondary transfer unit 70 and the main body 10A.

  Further, as described above, the engaging member 92 is detached from the opening 94A until the door panel 72 reaches the open position. Therefore, as shown in FIG. 10, the secondary transfer unit 70 is rotated in the direction of arrow F to move from the non-transfer position to the transfer position. As a result, the double-sided conveyance path 62 (see FIG. 12) formed between the secondary transfer unit 70 and the door panel 72 is opened, and the sheet member P jammed in the double-sided conveyance path 62 is removed.

  As described above, the secondary transfer unit 70 and the door panel 72 rotate on the same rotation shaft 74. That is, it is not necessary to provide the respective rotary shafts in the secondary transfer unit 70 and the door panel 72.

  Although the present invention has been described in detail with respect to specific embodiments, the present invention is not limited to such embodiments, and various other embodiments are possible within the scope of the present invention. It is clear to the contractor. For example, in the above embodiment, the secondary transfer roll 42 is provided in the secondary transfer unit 70, but it may be a transfer belt or the like.

  Next, an example of an image forming apparatus according to the second embodiment of the present invention will be described with reference to FIGS.

  In addition, about the same member as 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  As shown in FIG. 17, in this embodiment, unlike the first embodiment, the door panel 120 is not provided with a slide member that can move in the sheet material conveyance orthogonal direction. The engaging member 122 is provided.

  Specifically, the door panel 120 is rotatably provided with a shaft member 124 extending in the sheet material conveyance orthogonal direction, and the engaging member 122 is fixed to an intermediate portion of the shaft member 124. Also, a substantially triangular triangular member 126 is fixed to both ends of the shaft member 124 when viewed from the side (the axial direction of the shaft member 124).

  On the other hand, the secondary transfer unit 130 is provided with a columnar shaft member 132 on which an engagement member 122 provided on the door panel 120 is engaged, extending in the sheet material conveyance orthogonal direction. The shaft member 124 is provided with a torsion spring (not shown), and the shaft member 124 is biased so that the engaging member 122 fixed to the shaft member 124 is hooked on the shaft member 132 at a predetermined position. .

  As shown in FIGS. 13, 14, and 15, a long plate-like lever member 142 whose one end is pivotally supported by the main body 10 </ b> A of the image forming apparatus 10 so as to be rotatable about the shaft 140 is a secondary member. It is provided near both side surfaces of the secondary transfer unit 130 so as to sandwich the transfer unit 130 therebetween. A cylindrical projection 144 is provided at the other end of the lever member 142, and the projection 144 is movably fitted in a long hole 150A formed in the rail member 150 provided in the door panel 120. Yes.

  When the door panel 120 arranged at the closed position is opened, the protrusion 144 moves from one end of the elongated hole 150A of the rail member 150 toward the other end, and the protrusion 144 presses one side of the triangular member 126. It has become.

  Specifically, as shown in FIGS. 16A, 16B, and 16C, the projection 144 that moves from one end of the elongated hole 150A toward the other end presses one side of the triangular member 126, The shaft member 124 rotates in the arrow G direction (see FIG. 16C). When the shaft member 124 rotates, the engaging member 122 fixed to the shaft member 124 also rotates in the direction of arrow G, so that the engaging member 122 is detached from the shaft member 132.

  Next, an example of an image forming apparatus according to the third embodiment of the present invention will be described with reference to FIGS.

  In addition, about the same member as 2nd Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  As shown in FIG. 21, in this embodiment, unlike the second embodiment, the rotating shaft 74 is provided with a cam 160. Further, a rod-shaped bar member 164 whose one end is urged by the urging force of the coil spring 162 is movably provided on the door panel 174 on the cam surface 172 of the cam 160.

  Specifically, as shown in FIG. 18, the rod member 164 has two long holes 164 </ b> A penetrating the front and back of the rod member 164, and a pin 166 fixed to the door panel 174 has the two pins 166. It is inserted into the long hole 164A. Thereby, the rod member 164 is movable along the longitudinal direction of the long hole 164A.

  Further, one end of the coil spring 162 described above is fixed to a pin portion 164B formed on the bar member 164, and the other end of the coil spring 162 is fixed to a pin 168 fixed to the door panel 174. With this configuration, one end of the bar member 164 is biased toward the cam surface 172. In addition, a distal end portion of a lever member 170 whose base end portion is fixed to the shaft member 124 is rotatably attached to the other end portion of the bar member 164.

  Further, in the state where the door panel 174 is moved to the open position, the cam surface 172 to which one end portion of the bar member 164 is biased has a linear portion 172A that is linear when viewed from the side (the axial direction of the rotating shaft 74). Is provided. Then, the rod member 164 moves so as to approach the rotating shaft 74 by urging one end portion of the rod member 164 to the linear portion 172A.

  With this configuration, as shown in FIGS. 18, 19, and 20, when the secondary transfer unit 130 and the door panel 174 are opened, the bar member 164 whose one end is biased to the cam surface 172 is moved to the cam surface 172. Move along. Until the door panel 174 reaches the open position, one end of the bar member 164 reaches the straight part 172A of the cam surface 172, and the bar member 164 moves so as to approach the rotating shaft 74.

  Then, the lever member 170 rotatably attached to the other end portion of the bar member 164 rotates around the shaft member 124. Thereby, the engaging member 122 fixed to the shaft member 124 and the shaft member 124 rotates, and the engaging member 122 is detached from the shaft member 132.

1 is a perspective view illustrating a door panel and a transfer unit of an image forming apparatus according to a first embodiment of the present invention, and a state in which the door panel is disposed at a closed position. FIG. 3 is a perspective view showing the door panel and the transfer unit of the image forming apparatus according to the first embodiment of the present invention, and showing the middle of the door panel and the transfer unit being opened. 1 is a perspective view showing a door panel and a transfer unit of an image forming apparatus according to a first embodiment of the present invention, and showing a state in which the door panel is disposed at an open position. 1 is an enlarged perspective view showing a door panel and a transfer unit of an image forming apparatus according to a first embodiment of the present invention, and showing a state in which the door panel is arranged at a closed position. FIG. 3 is an enlarged perspective view showing the door panel and the transfer unit of the image forming apparatus according to the first embodiment of the present invention, and showing the middle of the door panel and the transfer unit being opened. 1 is an enlarged perspective view showing a door panel and a transfer unit of an image forming apparatus according to a first embodiment of the present invention, and showing a state in which the door panel is disposed at an open position. (A) (B) (C) It is the perspective view which showed operation | movement of the connection apparatus provided in the door panel and transfer unit of the image forming apparatus which concerns on 1st Embodiment of this invention. (A) (B) (C) It is sectional drawing which showed operation | movement of the connection apparatus provided in the door panel and transfer unit of the image forming apparatus which concerns on 1st Embodiment of this invention. 1 is a perspective view showing a door panel and a transfer unit of an image forming apparatus according to a first embodiment of the present invention, and showing a state in which the door panel is disposed at an open position. 1 is a perspective view illustrating a door panel and a transfer unit of an image forming apparatus according to a first embodiment of the present invention, in which the door panel is disposed at an open position and the transfer unit is disposed at a transfer position. 1 is a side view showing a door panel and a transfer unit of an image forming apparatus according to a first embodiment of the present invention. 1 is a schematic configuration diagram illustrating an image forming apparatus according to a first embodiment of the present invention. FIG. 6 is a perspective view showing a door panel and a transfer unit of an image forming apparatus according to a second embodiment of the present invention, and showing a state in which the door panel is arranged at a closed position. FIG. 6 is a perspective view showing a door panel and a transfer unit of an image forming apparatus according to a second embodiment of the present invention, and showing the middle of opening of the door panel and the transfer unit. FIG. 6 is a perspective view showing a door panel and a transfer unit of an image forming apparatus according to a second embodiment of the present invention, and showing a state in which the door panel is disposed at an open position. (A) (B) (C) It is the perspective view which showed operation | movement of the engagement member, the shaft member, etc. which were provided in the door panel and transfer unit of the image forming apparatus concerning 2nd Embodiment of this invention. FIG. 6 is a side view showing a door panel and a transfer unit of an image forming apparatus according to a second embodiment of the present invention. FIG. 9 is a perspective view showing a door panel and a transfer unit of an image forming apparatus according to a third embodiment of the present invention, and showing a state in which the door panel is arranged at a closed position. FIG. 6 is a perspective view showing a door panel and a transfer unit of an image forming apparatus according to a third embodiment of the present invention, and showing the middle of opening of the door panel and the transfer unit. FIG. 6 is a perspective view showing a door panel and a transfer unit of an image forming apparatus according to a third embodiment of the present invention, and showing a state in which the door panel is disposed at an open position. It is the side view which showed the door panel and transfer unit of the image forming apparatus which concern on 3rd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Image forming apparatus 10A Main body 10B Opening part 32 Intermediate transfer belt (Image forming means)
62 Double-sided conveyance path (recording medium conveyance path)
70 Secondary transfer unit (transfer unit)
72 Door panel (opening / closing member)
74 Rotating shaft (first rotating shaft)
76 Hook member (fixing member)
82 Handle member (fixing release member)
90 Connecting device (connecting means)
92 engaging member 94 slide member (engaged member)
94A Opening 96 Pressing Plate (Pressing Member)
98 Shaft (second rotary shaft)
100 Lever member 102 Protruding part (operation part)
104 Rail member (holding member)
104A long hole 120 door panel (opening / closing member)
122 engaging member (connecting means)
124 Shaft member (release means)
126 Triangular member (release means)
130 Secondary transfer unit (transfer unit)
132 Shaft member (connection means)
140 Shaft part 142 Lever member (release means)
144 Protrusion (release means)
150 Rail member (release means)
150A long hole (release means)
160 Cam 162 Coil spring (biasing member)
164 Bar member (moving member)
170 Lever member 172 Cam surface 174 Door panel (opening / closing member)

Claims (5)

An image forming means for forming an image;
A transfer position that is disposed opposite to the image forming unit and transfers an image formed by the image forming unit to a recording medium, and a non-rotating position about the first rotation axis with respect to the main body and separated from the image forming unit. A transfer unit that moves between transfer positions;
A recording medium conveyance path is formed between the transfer unit and a rotation position between the first rotation shaft and a closing position for closing the opening of the main body, and an opening position for opening the opening. A movable opening and closing member;
Connecting means for connecting the opening / closing member and the transfer unit;
Releasing means for releasing the connecting means until the opening and closing member reaches the open position, and allowing the transfer unit to rotate independently;
An image forming apparatus comprising: The connecting means includes
An engagement member provided in the transfer unit;
An engagement member provided on the opening and closing member and engaged with the engagement member,
The release means is
A lever member that is rotatably attached to the main body with a second rotation shaft having one end portion different from the first rotation shaft;
A holding means provided in the opening / closing member and movably holding an operating portion provided at the other end of the lever member;
A moving force conversion member that moves the engaged member by the movement of the operating portion of the lever member and removes it from the engaging member until the opening and closing member reaches the open position;
The image forming apparatus according to claim 1, further comprising: The operation portion is a protrusion protruding from the other end,
The moving force conversion member is a pressing member that is pressed by the moving projection and moves the engaged member,
The image forming apparatus according to claim 2, wherein the holding unit provided in the opening / closing member is a holding member in which a long hole is formed to hold the protrusion so as to be movable. A fixing member that is attached to at least one of the opening / closing member and the transfer unit, and that is connected to the transfer unit by the connecting means and fixes the opening / closing member that has moved to the closing position to the main body;
A fixing release member that releases the fixing by the fixing member and allows the opening / closing member disposed at the closed position to rotate to the open position;
The image forming apparatus according to claim 1, further comprising: The release means includes a cam provided on the rotating shaft, and a moving member that is movably supported by the opening and closing member and whose one end is urged against the cam surface of the cam by the urging member,
2. The image according to claim 1, wherein the cam surface is formed to move the other end portion of the moving member and release the connecting means when the opening and closing member moves to the open position. Forming equipment.

Images