JP4163472B2 - Processing apparatus and sheet processing apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a processing apparatus that performs predetermined processing, such as a sheet processing apparatus used in an image forming apparatus or the like having a jam processing mechanism.
[0002]
[Prior art]
An image forming apparatus that is a type of sheet processing apparatus that performs predetermined processing on a sheet, which is a processing apparatus that performs predetermined processing, is based on input image data transmitted from an installed image reading apparatus, an external terminal, or the like. An image is formed by forming an image, transferring the image to a sheet, and fixing the image on the sheet. In performing this image formation, the sheet is sequentially conveyed to a processing unit that performs each processing step. However, the sheet is obliquely fed, the environment changes, and the quality of the sheet itself (waist strength, thickness, material, curl, etc.). Jam may occur in each processing unit or in the transport path depending on the situation. In this case, the conventional jam processing has a structure in which the jammed sheet can be removed by opening the cover of the image forming apparatus or pulling out the processing unit.
[0003]
In other words, the upper body and the lower body can be divided around the rotation fulcrum provided on the paper feed side. After the upper body is opened, the conveyance guide body is rotated and opened in the same rotation direction as the upper body. In some cases, the peripheral surface side of the fixing roller can be exposed (see, for example, Patent Document 1).
[0004]
In addition, a jam release cover that is opened when removing the paper when a paper jam occurs in the fixing unit is provided so that it can be opened in a horizontal plane with the fulcrum provided at the end of the fixing unit body at the back of the drawer. Some are arranged close to the image forming apparatus main body (see, for example, Patent Document 2).
[0005]
Specifically, when a paper jam occurs in the fixing unit, the fixing device is pulled out from the image forming apparatus main body. Next, the jam removal cover is opened by rotating in the horizontal plane from the front side (front side) of the fixing device, and the paper is removed.
[0006]
[Patent Document 1]
JP-A-64-88560 (FIGS. 2 and 3)
[Patent Document 2]
JP 2000-305392 A (FIG. 3)
[0007]
[Problems to be solved by the invention]
However, in the above-mentioned Patent Document 1, after the heavy upper body is opened, the conveyance guide body can be further rotated and opened to perform the jam processing, and many operations before the jam processing are performed. It takes. In addition, since the entire upper body is pivoted and opened, it will be exposed to unnecessary parts inside the device, and it may cause a failure by applying a load to other parts that are not needed by the worker during work. There is.
[0008]
On the other hand, in the above-mentioned Patent Document 2, when the jam processing is performed, the configuration in which the jam processing cover is rotated in the horizontal plane with respect to the pulling direction of the processing unit is ensured by a jam processing space such as inserting a hand. Although workability can be expected to improve, it is necessary to secure a wide working space for performing the above processing.
[0009]
Also, if the processing unit is a heating type fixing device, the fixing device that pulls out from the image forming device and performs jam processing is hot, and it needs more space to prevent accidental touching because it is dangerous. And
[0010]
The above problems are problems that generally occur not only in the image forming apparatus but also in a processing apparatus that performs predetermined processing such as a sheet processing apparatus.
[0011]
An object of the present invention is to maintain a working space for a unit such as jam processing by disposing a movable part that rotates upward about an axis orthogonal to a unit drawing direction from the apparatus main body. Meanwhile, an object of the present invention is to provide a processing apparatus capable of reducing the area occupied by the apparatus main body.
[0012]
[Means for Solving the Problems]
The present invention comprises the following means in order to solve the above problems.
[0013]
  (1) A unit having a movable part at a part thereof is provided so as to be freely drawn out from the apparatus main body, and a sheet conveyance path that passes through the unit is configured. A sheet processing apparatus having a pair of rollers, wherein the sheet conveyance in the unit is performed by moving a movable portion with respect to the unit after the unit is pulled out from the apparatus main body at the time of paper jam release operation in the sheet conveyance path. In the sheet processing apparatus that opens a part of the path to the outside of the apparatus main body,
  The movable portion includes a support portion that is disposed in an upper portion of the unit and supports a roller on the upper side of the downstream roller pair of the two roller pairs, and is higher than the upstream roller pair of the two roller pairs. Centered on an axis arranged above the upstream side and orthogonal to the direction in which the unit is drawn outThe direction opposite to the unit pull-out directionUpwardTo the position inclined toward the device main bodySupported by the unit to rotateAnd a protrusion projecting toward the apparatus main body after rotating to a position inclined toward the apparatus main body,
  A first conveyance path formed in parallel with the drawing direction of the unit, and a second conveyance path formed in parallel with the outer wall panel between the outer wall panel of the unit and the movable part, Form continuously as partIt is characterized by that.
[0014]
In this configuration, in a processing apparatus in which a unit having a movable part is provided so as to be freely drawable with respect to the apparatus main body, the unit body is pulled out from the apparatus main body when working on the unit, and the movable part is orthogonal to the drawing direction of the unit body. It pivots upward about the axis. Accordingly, the inside of the unit is opened by rotating the movable part about the axis orthogonal to the unit drawing direction, so that the space for working on the unit is not reduced, and the burden on the operator is large. There is nothing. In addition, since the movable part rotates above the unit body, it is not necessary to secure a new space for the movable part to rotate, and the occupied area of the apparatus main body does not increase.
[0018]
In this configuration, the movable portion rotates upward in the direction opposite to the unit pull-out direction, and is formed in parallel with the first transport path for transporting the sheet formed parallel to the unit body pull-out direction and the outer wall panel of the unit. The second conveyance path is formed in the unit as a part of the sheet conveyance path so as to be continuous with the second conveyance path. Therefore, the second transport path is formed at the end of the unit opposite to the direction in which the movable part inside the outer wall panel rotates, and the movable part is also located inside the outer wall panel. Since the inner wall rotates from the inside of the outer wall panel to the upper side of the unit on the opposite side of the outer wall panel, the range in which the movable part rotates is not narrowed, and the range in which the sheet conveyance path is opened is narrowed. There is no.
[0019]
Further, since the sheet conveyance direction and the rotation direction of the movable portion are parallel, the rotation radius of the movable portion does not exceed the sheet conveyance path width in the direction orthogonal to the sheet conveyance direction, and the rotation range is small. Never become.
[0021]
In this configuration, the movable part is formed so as to rotate upward in the direction opposite to the direction in which the unit body is pulled out. Further, when the movable part is rotated and opened, a part of the movable part is on the apparatus main body side. A convex portion is formed on the movable portion so as to protrude toward the surface. Therefore, when the unit body is pushed into the apparatus main body with the movable part opened, the convex part collides with the apparatus main body, and the force in the pull-out direction of the unit body necessary for the movable part to return to the original position is obtained. It is given to the convex part. Therefore, the movable part rotates in a direction to return to the original position, and the movable part is prevented from being damaged by an impact sandwiched between the outer wall panel and the apparatus main body.
[0022]
  (2The upper roller is urged toward the lower roller constituting the roller pair together with the upper roller via an elastic member.
[0023]
In this configuration, at least one of a pair of roller members that are pivotally supported by the movable portion and the unit body and sandwich the sheet conveyance path is disposed so as to protrude from the movable portion or the unit body. In addition, at least one of the movable member and the unit body is constituted by an elastic member. Therefore, since the roller member is configured to protrude, when the movable part returns from the open state to the original position, the roller members collide with each other, so that other parts of the unit do not collide, and Since the roller member or the support member is configured via the elastic member, the impact of the collision is absorbed, and the impact is not transmitted to the movable portion and other portions of the unit body, thereby preventing the unit from being damaged.
[0024]
  (3The unit is a fixing device having heating means for fixing the image transferred on the sheet.
[0025]
In this configuration, the unit is a fixing device having heating means for fixing an image on the sheet. Therefore, a part of the sheet conveyance path inside the unit is not opened, and the space for performing the jam release operation is not narrowed, so that the burden on the worker due to the heat of the heating means does not increase. Moreover, since the movable part rotates upward, the occupied area of the apparatus main body does not increase.
[0026]
DETAILED DESCRIPTION OF THE INVENTION
An image forming apparatus that is a sheet processing apparatus will be described below as an example of a processing apparatus according to an embodiment of the present invention.
[0027]
FIG. 1 is a cross-sectional view schematically showing the configuration of an image forming apparatus according to an embodiment of the present invention.
[0028]
The image forming apparatus 100 according to the embodiment of the present invention applies black (K) and cyan (C) to a predetermined sheet (recording medium such as recording paper or OHP) according to image data transmitted from the outside. Then, a multicolor image using magenta (M) and yellow (Y) toners and a monochrome image using black (K) toner are formed. As shown in FIG. 1, the image forming apparatus 100 includes image stations Pa to Pd, a transfer conveyance belt unit 7, an exterior unit 20, a paper conveyance path S, a paper feed tray 10, paper discharge trays 15 and 33, and the like. ing.
[0029]
Each of the image stations Pa to Pd sequentially corresponds to toners of each color of black (K), cyan (C), magenta (M), and yellow (Y), and all have the same structure. For example, in the image station Pa, a cleaner unit 4a, a charger 5a, an exposure unit 1a, and a developing unit 2a are arranged in this order from the exterior unit 20 side above the image station Pa, and the photosensitive unit 3a is arranged below the charger 5a. Has been.
[0030]
The photosensitive drum 3 has a photosensitive layer having a photoconductive action formed on the surface thereof, and the charger 5 is a charging means for uniformly charging a predetermined potential on the surface of the photosensitive drum 3. As the charger 5, a charger type shown in FIG. 1 is used in addition to a contact type roller type and a brush type. The exposure unit 1 forms an electrostatic latent image on the surface of the photosensitive drum 3 by exposing the charged photosensitive drum 3 based on the image data transmitted to the image forming apparatus 100. In addition, for example, a laser scanner unit (LSU) including an EL, an LED writing head, a laser irradiation unit, and a reflection mirror in which light emitting elements are arranged in an array is used as the exposure unit 1. The developing device 2 visualizes the electrostatic latent images formed on the photosensitive drums 3a to 3d by applying toners corresponding to black, cyan, magenta, and yellow. The cleaner unit 4 removes and collects toner remaining on the surface of the photosensitive drum 3 after development and image transfer.
[0031]
The transfer conveyance belt unit 7 disposed below the photosensitive drum 3 includes a transfer roller 6 (6a to 6d), a transfer belt 8, a transfer belt driving roller 71, a transfer belt tension roller 72, a transfer belt driven roller 73, a transfer belt. A belt support roller 74 and a transfer belt cleaning unit 9 are provided.
[0032]
The transfer roller 6, the transfer belt drive roller 71, the transfer belt tension roller 72, the transfer belt driven roller 73, the transfer belt support roller 74, and the like stretch the transfer belt 8 and rotate it in the direction of arrow A.
[0033]
The transfer roller 6 is rotatably supported by a frame (not shown) inside the transfer conveyance belt unit 7, and a toner image formed on the surface of the photosensitive drum 3 based on the image data is transferred onto the transfer belt 8. It is transferred to a sheet that is sucked and conveyed. A high voltage having a polarity (+) opposite to the charging polarity (−) of the toner is applied to the transfer roller 6 in order to transfer the toner image. Accordingly, the toner attached to the surface of the photosensitive drum 3 is transferred to the sheet by applying a high voltage having a polarity opposite to that of the toner from the transfer roller 6 through the transfer belt 8. The transfer roller 6 is based on a metal shaft such as stainless steel having a diameter of 8 to 10 mm, and the surface thereof is covered with a conductive elastic material such as EPDM or foamed urethane. A high voltage can be uniformly applied to the sheet by the conductive elastic material. In the embodiment of the present invention, the transfer roller 6 is used as the transfer electrode, but a brush or the like may be used instead.
[0034]
The transfer belt 8 is provided so as to come into contact with the respective photosensitive drums 3a to 3d. The transfer belt 8 moves in the direction of arrow A to convey the sheet, and sequentially transfers the toner images of the respective colors formed on the surfaces of the respective photosensitive drums 3a to 3d onto the sheet, thereby transferring the sheet. A color toner image (multicolor toner image) is formed on the surface. The transfer belt 8 is formed endlessly using a film having a thickness of about 100 μm to 150 μm.
[0035]
Since the transfer belt cleaning unit 9 causes the back surface of the sheet to become dirty, the transfer belt 8 removes and collects toner adhered by contact with the photosensitive drum 3 or the like. In the transfer belt cleaning unit 9, for example, a cleaning blade is used as a cleaning member, and is placed in contact with the surface of the transfer belt 8. Further, a transfer belt support roller 74 is placed in contact with the back surface of the transfer belt 8 so as to face the cleaning blade, and supports the transfer belt 8.
[0036]
Further, the image forming apparatus 100 includes a sheet conveyance path S for conveying the sheets stored in the paper feed tray 10 to the paper discharge tray 13 or 33 via the transfer conveyance belt unit 7 and the exterior unit 20. ing. On the sheet conveyance path S, a pickup roller 14, a registration roller 15, a conveyance switching gate 34, a conveyance roller 16, and the like are arranged.
[0037]
The paper feed tray 10 is a tray for storing sheets used for image formation, and is provided below the transfer belt 8.
[0038]
The conveyance rollers 16 are small rollers for promoting and assisting conveyance of the sheet, and a plurality of conveyance rollers 16 are provided along the sheet conveyance path S. The pickup roller 14 is an attracting roller that is provided at the end of the sheet feeding tray 10 and supplies sheets from the sheet feeding tray 10 to the sheet conveyance path S one by one.
[0039]
The conveyance direction switching guide 34 is rotatably supported by the outer wall panel 35 and switches between the discharge trays 13 and 33 to discharge the sheet on which image formation has been completed. When the conveyance direction switching guide 34 is in a state shown by a straight line in FIG. 1, a second conveyance path S <b> 2 (a sheet conveyance path of the sheet conveyance path) described later between the guide unit 40 described later, the outer wall panel 35, and the conveyance direction switching guide 34 is described. 1), the sheet is discharged to the discharge tray 13 via the sheet conveying path S and the conveying roller 16 above the conveying direction switching guide 34, and in the state indicated by the broken line in FIG. The recording medium is discharged from the sheet transport path S between the transport direction switching guide 34 and the transport direction switching guide 34 to the paper discharge tray 33.
[0040]
The registration roller 15 temporarily holds the sheet conveyed on the sheet conveyance path S. Then, the sheet is conveyed with good timing in accordance with the rotation of the photosensitive drum 3 so that the toner image on the photosensitive drum 3 can be satisfactorily multiplex-transferred to the sheet. That is, the registration roller 15 matches the leading edge of the toner image formed on the surface of each of the photosensitive drums 3a to 3d with the leading edge of the image forming range of the sheet based on a detection signal output from a pre-registration detection switch (not shown). The sheet can be conveyed.
[0041]
The paper discharge tray 13 places the image-formed sheet conveyed from the sheet conveyance path S face down. The sheet discharge tray 33 places the image-completed sheet conveyed from the sheet conveyance path S face up. The sheet on which the image formation after the fixing of the multicolor toner image has been completed is conveyed to the reverse paper discharge path of the sheet conveyance path S by the conveyance roller 16, and is reversed (the multicolor toner image is directed downward). ) On the paper discharge tray 13.
[0042]
2 and 3 are a cross-sectional view and an external view showing a state in which the exterior unit provided in the image forming apparatus according to the embodiment of the present invention is exposed from the main body of the image forming apparatus.
[0043]
As shown in FIGS. 2 and 3, the exterior unit 20 which is a unit of the present invention includes the fixing device 12, the outer wall panel 35, the above-described discharge tray 33, the conveyance direction switching guide 34, and the like. Further, the exterior unit 20 can be exposed from the main body of the image forming apparatus 100, is pulled out by a slide movement, and a sliding member such as an aclide is used for the slide movement.
[0044]
The fixing device 12 includes a heat roller 31, a pressure roller 32, a lower conveyance roller 36, a guide unit 40, an upper conveyance roller 41, a conveyance roller support plate 42, a fulcrum 43, and the like. Further, the fixing device 12 is formed with a first transport path S1 parallel to the pull-out direction of the exterior unit 20, and between the guide unit 40, which is a movable portion of the present invention, and the outer wall panel 35, parallel to the outer wall panel 35. A second conveyance path S2 is formed, and is configured as a part of the sheet conveyance path S so that both the conveyance paths S1 and S2 are continuous via the conveyance direction switching guide 34.
[0045]
The heat roller 31 and the pressure roller 32 are arranged so that the surfaces are in pressure contact with each other, and rotate with the sheet sandwiched between the pressure contact portions of both the rollers 31 and 32.
[0046]
Further, the heat roller 31 is set so as to reach a predetermined fixing temperature by a control unit (not shown) based on a signal from a temperature detector (not shown), and the pressure roller 32 and the pressure roller 32 are subjected to thermocompression bonding. As a result, the multicolor toner image transferred to the sheet is melted, mixed, and pressed, and thermally fixed to the sheet.
[0047]
The lower conveyance roller 36 and the upper conveyance roller 41 are paired and convey a sheet on which image formation has been completed.
[0048]
The upper conveying roller 41 is provided in the guide unit 40, a part of which protrudes from the guide unit 40, and is rotatably supported by a conveying roller support plate 42 that is an elastic support plate. Further, the transport roller upper 41 is made of a plastic material having high mechanical performance such as POM (polyacetal resin). The conveyance roller support plate 42 is made of a thin plate material of a stainless steel plate for a spring. On the other hand, the lower conveyance roller 36 is made of a material having an elastic surface and a high friction coefficient, for example, rubber or a polymer material, in order to improve sheet conveyance performance.
[0049]
The upper transport roller 41 and the lower transport roller 36 correspond to a pair of roller members according to the present invention.
[0050]
The guide unit 40 is disposed above the fixing device 12 and guides the sheet when the sheet on which image formation has been completed is conveyed. The guide unit 40 has a convex portion 44 at the upper portion, and rotates upward in the direction opposite to the pulling-out direction of the exterior unit 20. The second conveyance path S2 configured in the exterior unit 20 is located at the end of the exterior unit 20 inside the outer wall panel 35 facing the fulcrum 43, and the guide unit 40 is also located inside the outer wall panel 35 in the same manner. Therefore, the rotation range when the guide unit 40 rotates from the inside of the outer wall panel 35 at the end of the exterior unit 20 to the upper side of the fulcrum 43 can be increased. Therefore, by rotating the guide unit 40, the vicinity of the first transport path S1 and the second transport path S2 can be sufficiently opened, and a sufficient work space 50 can be secured.
[0051]
When a trouble such as a jam occurs in the fixing process for fixing the toner image transferred to the sheet by the fixing device 12, the exterior unit 20 is exposed from the main body of the image forming apparatus 100 in order to remove the jam. Specifically, as shown in FIGS. 2 and 4, the exterior unit 20 is pulled out.
[0052]
Next, as shown in FIGS. 2 and 3, the guide unit 40 is rotated upward in the direction opposite to the direction pulled out from the main body of the image forming apparatus 100, and the guide unit 40 is opened to perform the jam removal operation.
[0053]
  In the jam removing operation such as removing the sheet, the guide unit 40 rotates upward on the area of the exterior unit 20, and therefore it is necessary to secure an extra work space for the guide unit 40 to rotate.NaTherefore, the area occupied by the image forming apparatus 100 can be reduced, and the work space 50 around the first transport path S1 and the second transport path S2 in the exterior unit 20 can be sufficiently secured as described above.wearTherefore, even when the jam removal operation involves heat from the heating means of the fixing device 12, the burden on the operator can be reduced.
[0054]
In addition, since the sheet conveyance direction and the pull-out direction of the exterior unit 20 are parallel, even if the sheet is jammed between another unit or the like and the exterior unit 20, the sheet is pulled because the exterior unit 20 is pulled out in the sheet conveyance direction. It is easy to take out, can prevent the jammed sheet from being torn, and can reduce the burden on the operator such that it is difficult to remove the sheet.
[0055]
Furthermore, since the sheet conveyance direction and the rotation direction of the guide unit 40 are parallel, the rotation radius of the guide unit 40 can be made shorter than the sheet conveyance path width orthogonal to the sheet conveyance direction, and the rotation range can be increased. Therefore, the work space 50 can be secured more.
[0056]
Next, when the jam removal is completed, the guide unit 40 is rotated around the fulcrum 43 to return to the original position. At this time, the return position of the guide unit 40 is determined by the upper pair of transport rollers 41 and the lower transport rollers 36. That is, the upper and lower positions of the guide unit 40 are determined because the upper conveyance roller 41 protrudes and contacts the lower conveyance roller 36 that is fixed.
[0057]
Accordingly, the guide surface serving as a sheet conveyance guide on the conveyance roller 41 and the guide unit 40 does not contact the sheet conveyance guide surface on the fixing device 12 body side, and the guide surface can be prevented from being damaged. Also, the elastic member on the surface of the pair of rollers 36 and 41 and the conveying roller support plate 42 (elastic member) for supporting the conveying roller upper 41 are arranged on the conveying roller upper 41 when the guide unit 40 returns to the original position. Further, it has an effect of absorbing a shock generated by a collision with the lower conveyance roller 36 and a soundproofing effect. Therefore, the load applied to the fixing device 12 can be suppressed, and the product life can be extended.
[0058]
Thereafter, the exterior unit 20 is slid again to return to the original position in the main body of the image forming apparatus 100.
[0059]
Here, with the guide unit 40 rotated and retracted, that is, with the work space 50 opened for jam removal work, a slide movement operation for erroneously returning the exterior unit 20 to the original position is performed. If it has been done, the projection 44 projecting toward the main body of the image forming apparatus 100 provided in the guide unit 40 collides with the main body of the image forming apparatus 100, so that the guide unit 40 is moved to the original position of the fixing device 12. It is configured to return to.
[0060]
In the above-described case, since the convex portion 44 protrudes toward the image forming apparatus 100 main body, the guide unit 40 returns to the original position when it collides with the image forming apparatus 100 main body. A force in the pull-out direction is applied to the guide unit 40 through the convex portion 44, and the guide unit 40 can return to the original position. Accordingly, it is possible to prevent damage due to an impact in which the revolving guide unit 40 is sandwiched between the outer wall frame of the image forming apparatus 100 and the outer wall panel 35 of the exterior unit 20.
[0061]
Thereafter, the exterior unit 20 returns to the original position in the main body of the image forming apparatus 100 by sliding movement.
[0062]
Although a multicolor image forming apparatus is described here, a single color image forming apparatus having a single image forming station may be used.
[0063]
The present invention is not limited to an image forming apparatus, and can be applied to a processing apparatus that performs a predetermined process.
[0064]
【The invention's effect】
As described above, according to the present invention, the following effects can be obtained.
[0065]
(1) In a processing apparatus that performs a predetermined process including a unit having a movable part that can be pulled out from the apparatus main body, the unit body is pulled out from the apparatus main body when working on the unit, and the movable part is orthogonal to the direction in which the unit body is pulled out By rotating upward about the axis to be operated, the inside of the unit can be sufficiently opened, and a sufficient space for performing work on the unit can be secured, so that the burden on the operator can be reduced. Further, since the movable part is rotated upward of the unit body, it is not necessary to secure a new space for rotating the movable part, and the area occupied by the apparatus main body can be reduced.
[0066]
(2) In a sheet processing apparatus that includes a unit having a movable part that can be pulled out from the apparatus main body and performs predetermined processing on the sheet, the unit body is pulled out from the apparatus main body during jam removal work, and the movable part is pulled out from the unit body. By rotating upwards about an axis orthogonal to the direction, the vicinity of the sheet conveyance path inside the unit can be sufficiently opened, and a sufficient space for jam removal work can be secured, so that the burden on the operator is reduced. Can be reduced. Further, since the movable part is rotated upward of the unit body, it is not necessary to secure a new space for rotating the movable part, and the area occupied by the apparatus main body can be reduced.
[0067]
(3) The movable part is rotated upward in the direction opposite to the unit pulling direction, and is formed in parallel with the first transport path for transporting the sheet formed in parallel with the unit body pulling direction and the outer wall panel of the unit. A unit in which the second conveyance path is formed in the unit as a part of the sheet conveyance path so as to be continuous, so that the second conveyance path is on the side opposite to the direction in which the movable portion inside the outer wall panel rotates. Since the movable part is also located on the inner side of the outer wall panel, the movable part is rotated from the inner side of the outer wall panel to the upper side of the unit on the apparatus main body side opposite to the outer wall panel. The rotation range of the part can be enlarged, the vicinity of the sheet conveyance path in the unit can be opened more, and a wider working space can be secured.
[0068]
In addition, since the drawing direction of the unit body and the sheet conveyance direction are parallel, even if a sheet is jammed between another unit and the unit, the unit is pulled out in the sheet conveyance direction, so the sheet can be easily pulled out and jammed. It is possible to prevent the sheet from being torn and to reduce the burden on the operator such that it is difficult to remove the sheet.
[0069]
Further, since the sheet conveyance direction and the rotation direction of the movable part are parallel, the rotation radius of the movable part can be made shorter than the sheet conveyance path width in the direction orthogonal to the sheet conveyance direction, so that the rotation range is further increased. The work space can be secured more.
[0070]
(4) The movable part is formed so as to rotate upward in the direction opposite to the drawing direction of the unit body, and further, with the movable part rotated and opened, a part of the movable part is directed toward the apparatus main body side. By forming a convex part in the movable part so that it protrudes, when the unit body is pushed into the device main body with the movable part opened, the convex part collides with the device main body, making it movable The force in the pull-out direction of the unit body necessary for returning the part to the original position can be applied to the convex part. Therefore, the movable part can be rotated in a direction to return to the original position, and when the movable part is forgotten to be returned to the original position and the unit body is returned to the apparatus main body, the movable part becomes the outer wall panel and the apparatus main body. It is possible to prevent damage due to the impact sandwiched between the two.
[0071]
(5) At least one of a pair of roller members that are pivotally supported by the movable portion and the unit body and sandwich the sheet conveyance path is disposed so as to protrude from the movable portion or the unit body. In addition, by configuring the roller member or support member of at least one of the movable part and the unit body via an elastic member, the roller member protrudes when the movable part returns from the open state to the original position. Therefore, the roller members can collide with each other, the other parts of the unit do not collide, and the guide surface of the sheet conveyance path in the movable portion can be prevented from being damaged. Further, since the roller member or the support member is configured through the elastic member, it is possible to absorb the impact of the collision, prevent the unit from being damaged by the impact and the generation of the collision sound, and extend the product life.
[0072]
(6) Since the unit is a fixing device having a heating unit for fixing the image on the sheet, the vicinity of the sheet conveyance path inside the unit can be sufficiently opened, and a sufficient space for performing the jam removing operation can be secured. Therefore, the burden on the operator accompanying the heat of the heating means can be reduced. Further, since the movable part is rotated upward of the unit body, it is not necessary to secure a new space for rotating the movable part, and the area occupied by the apparatus main body can be reduced.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view schematically showing a configuration of an image forming apparatus according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view illustrating a state where an exterior unit provided in the image forming apparatus is exposed from the image forming apparatus main body.
FIG. 3 is an external view showing a state in which an exterior unit provided in the image forming apparatus is exposed from the image forming apparatus main body.
FIG. 4 is an external view illustrating a state in which an exterior unit provided in the image forming apparatus is exposed from the image forming apparatus main body.
[Explanation of symbols]
12-Fixing device
20-exterior unit
35-outer wall panel
36-under the transport roller
40-Guide unit
41-on the transport roller
42-conveying roller support plate
43-fulcrum
44-convex
50-work space
100-Image forming apparatus
S-sheet transport path
S1-first transport path
S2-second transport path

Claims (3)

A unit having a movable part in part can be pulled out from the apparatus main body, and a sheet conveying path passing through the unit is configured, and two roller pairs are provided along the conveying direction in the sheet conveying path in the unit. The sheet processing apparatus is configured to move one of the sheet conveyance paths in the unit by moving the movable unit with respect to the unit after pulling out the unit from the apparatus main body during the jam removal operation of the sheet in the sheet conveyance path. In a sheet processing apparatus that opens a part to the outside of the apparatus main body,
The movable portion includes a support portion that is disposed in an upper portion of the unit and supports a roller on the upper side of the downstream roller pair of the two roller pairs, and is higher than the upstream roller pair of the two roller pairs. A shaft arranged on the upper upstream side and rotated about a shaft orthogonal to the pulling-out direction of the unit toward a position inclined toward the apparatus main body upward in a direction opposite to the pulling-out direction of the unit. A convex portion that is supported by the unit and protrudes toward the apparatus main body after rotating to a position inclined toward the apparatus main body;
A first conveyance path formed in parallel with the drawing direction of the unit, and a second conveyance path formed in parallel with the outer wall panel between the outer wall panel of the unit and the movable part, A sheet processing apparatus which is continuously formed as a part . The upper roller is a lower roller constituting a roller pair with the upper roller via an elastic member at a position protruding from the movable part at a position farthest from the axis when viewed from the axial direction. the sheet processing apparatus according to claim 1, characterized that you have been biased toward. The sheet processing apparatus according to claim 2 , wherein the unit is a fixing device having a heating unit that fixes an image transferred onto the sheet.

Images