JP2007204196A - Paper reversing device and image forming device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a paper reversing device capable of being attached to/detached from a main body of a device as an option, preventing increase in the size of the device even if being attached to the main body and requiring no large space for jam processing. <P>SOLUTION: This paper reversing device 100 is provided with a paper carrying-in port 110, a paper carrying-out port 115, a carrying path 120 for carrying paper in one direction and a switchback carrying path 130 for switchbacking of the paper carrying direction. The paper reversing device 100 reverses front and back sides of paper carried in from the carrying-in port 110 and discharges the paper to the carrying-out port 115. A link member is provided between a member constituting the carrying path 120 and a member constituting the switchback carrying path 130. When opening operation is performed to expose one carrying path out of the carrying path 120 and the switchback carrying path 130, opening operation to expose the other carrying path is synchronously performed. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a sheet reversing device and an image forming apparatus, and in particular, a sheet carry-in port, a sheet carry-out port, a conveyance path that conveys a sheet in one direction, and a switchback conveyance path that switches back the conveyance direction of the sheet. And a sheet reversing device for reversing the sheet carried from the carry-in entrance and discharging it to the carry-out exit.

  In an image forming apparatus, a sheet reversing device (duplex unit) may be used when performing duplex printing. That is, in such an image forming apparatus, printing is performed on one side of the image forming apparatus main body, and the paper printed on the one side is turned upside down by the paper reversing apparatus and transferred again to the image forming apparatus main body. Print on the side.

  For this reason, the sheet reversing device must be disposed adjacent to the image forming apparatus main body. In such a case, there is one in which the sheet reversing device is mounted in the body of the image forming apparatus together with the image forming apparatus main body. In such an image forming apparatus, the main body of the image forming apparatus becomes large, and when a paper reversing device is mounted as a standard or not equipped with a paper reversing device, a paper transporting device is installed in a space where the paper reversing device is to be arranged. Need to be placed. In such a case, for a user who does not need double-sided printing, the size of the paper reversing device that is not used increases, and the cost of the paper transporting device increases.

  On the other hand, there is an image forming apparatus in which a sheet reversing device can be mounted on a side surface of the image forming apparatus. In this image forming apparatus 300, as shown in FIG. 13, a sheet reversing device 320 is set as an optional product arranged on the side surface of the image forming apparatus main body 310. In such an image forming apparatus 300, the entire image forming apparatus 300 is enlarged by the amount of the paper reversing device 320 disposed on the side surface of the image forming apparatus main body 310. As shown in FIG. 2, it is necessary to secure a space for opening the sheet reversing device 320, and it is necessary to increase the occupation area.

  Furthermore, there is an image forming apparatus 400 in which a sheet reversing device is mounted on the back surface of the image forming apparatus. As shown in FIG. 14, the image forming apparatus 400 has a sheet reversing device 420 installed on the back surface of the image forming apparatus main body 410. In this image forming apparatus 400, the entire image forming apparatus 400 becomes large, and when the paper reversing device 420 is jammed, it is necessary to go around and perform the processing later. It is necessary to occupy a larger area than the image forming apparatus 300. Further, during the jam processing of the paper reversing device 420, it is necessary to open and check a number of paper transport guide plates for jam processing, and in some cases, a piece of jammed paper enters into a place where it cannot be reached. As shown, it is necessary to separate the image forming apparatus main body 410 and the sheet reversing apparatus 420 from each other.

  By the way, the following has been proposed as a sheet reversing device used in such an image forming apparatus. In Patent Document 1, as an image forming apparatus in which a duplex unit having a duplex path and a switchback path is made detachable from the apparatus main body, a first transport path and another ejection tray for ejecting to a delivery tray are disclosed. And a second conveyance path for conveying the sheet to the duplex unit, and the sheet conveyed from the fixing unit in the image forming apparatus is selectively selected by the first conveyance path or the second conveyance path. In the paper discharge unit that transports the paper, the paper discharge unit is divided into a first unit that forms the first transport path and a second unit that forms the second transport path.

  In Patent Document 2, a recording paper re-conveying unit and a recording paper reversing and conveying unit are detachably provided to the image forming apparatus main body, and the recording paper discharged from the image forming unit is recorded in the recording paper reversing and conveying unit. A device for reversing and conveying a sheet is described, and a recording sheet re-conveying unit is provided with a sheet conveying section for sending the reversed and conveyed recording sheet to a sheet reversing section.

Further, Patent Document 3 discloses that a printer with a paper transport unit includes a printer main body and an optional paper transport unit mounted on the printer main body instead of a paper feed cassette. The paper transport unit is described as being inserted into the accommodation space and mounted.
Japanese Patent Laid-Open No. 10-181978 JP 7-168407 A Japanese Patent Laid-Open No. 10-142868

  As described above, when the paper reversing device is attached to the conventional image forming apparatus, the paper reversing device needs to be configured to be attached to and detached from the image forming apparatus main body as an option. The forming apparatus becomes large, or a space necessary for jam processing is required.

  Accordingly, the present invention provides a sheet reversing apparatus and an image forming apparatus that can be attached to and detached from the apparatus main body as an option, and that the apparatus does not become large even if attached, and does not require a large space for jamming. With the goal.

  The invention according to claim 1 includes a paper carry-in port, a paper carry-out port, a carry path for carrying the paper in one direction, and a switchback carry path for switching back the paper carry direction. A paper reversing device for reversing the front and back of the paper and discharging it to a carry-out port, comprising a link member between a member constituting the transport path and a member constituting the switchback transport path, and the transport path and A sheet reversing device characterized in that, when an opening operation for exposing one of the switchback conveying paths is performed, the other opening operation for exposing the other conveying path is performed synchronously. .

  According to a second aspect of the present invention, in the paper reversing device according to the first aspect, a conveying path forming member arranged to face the conveying path and configured to be openable and closable, and arranged to face the switchback conveying path A switchback transport path constituent member configured to be openable and closable, and the link member opens one of the transport path constituent member and the switchback transport path constituent member. In conjunction with this, the other is opened.

  According to a third aspect of the present invention, in the paper reversing device according to the second aspect, the transport path constituting member includes a plurality of transport path constituting member elements that are respectively arranged to face different portions of the transport path. And

  According to a fourth aspect of the present invention, in the sheet reversing device according to the second aspect, the switchback transport path constituent members are a plurality of switchback transport path constituent members that are arranged to face different portions of the switchback transport path. It is characterized by including elements.

  According to a fifth aspect of the present invention, in the sheet reversing device according to the third or fourth aspect, the plurality of transport path constituent members or the plurality of switchback transport path constituent members are a central portion in the transport path or the switchback transport path. It is characterized in that the conveyance path or the switchback conveyance path is opened and closed by being configured to be rotatable about a side fulcrum.

  According to a sixth aspect of the present invention, in the sheet reversing device according to any one of the third to fifth aspects, the plurality of conveyance path constituting members or the plurality of switchback conveyance path constituting portions are supported at a fulcrum serving as a common rotation center. It is characterized by.

  According to a seventh aspect of the present invention, in the sheet inverting device according to any one of the second to sixth aspects, the switchback conveyance path constituting member is disposed to face the conveyance path constituting member, and also constitutes the conveyance path. It is characterized by that.

  According to an eighth aspect of the present invention, in the paper reversing device according to any one of the first to seventh aspects, the conveyance path and the switchback conveyance path are arranged so as to overlap each other when viewed from the carry-in entrance side. It is characterized by.

  According to a ninth aspect of the present invention, in the paper reversing device according to any one of the first to eighth aspects, the transport path is disposed so as to transport the paper loaded from the carry-in port to the switchback transport path.

  According to a tenth aspect of the present invention, in the paper inverting apparatus according to any one of the first to ninth aspects, the carry-in port and the carry-out port are arranged on the same surface of the paper inverting device.

  The invention of claim 11 is the paper reversing device according to any one of claims 1 to 10, comprising a paper reversing device housing and a paper reversing device main body arranged in the paper reversing device housing. The temperate zone is formed so that it can be pulled out from the paper reversing device casing.

  A twelfth aspect of the invention includes a main body portion that forms an image on a paper, and a paper reversing device according to any one of the first to eleventh aspects that is detachably disposed below the main body portion. The image forming apparatus.

  The invention according to claim 13 has a paper carry-in port, a paper carry-out port, a carrying route for carrying the paper in one direction, and a switchback carrying route for switching back the paper carrying direction, and is carried in from the carry-in port. An image forming apparatus comprising a sheet reversing unit that reverses the front and back sheets and ejects the paper to the carry-out port, and an image forming apparatus main body unit that includes a paper feed tray and forms an image on the paper, wherein the reversing unit includes: An image forming apparatus is detachably disposed below a main body.

  According to a fourteenth aspect of the present invention, in the image forming apparatus according to the thirteenth aspect, the reversing unit is arranged to support the main body.

  According to the sheet reversing apparatus and the image forming apparatus according to the present invention, the apparatus can be attached to and detached from the apparatus main body as an option, and even if attached, the apparatus does not become large, and a large jam processing space is not required. effective.

  Embodiments as the best mode for carrying out the present invention will be described below with reference to the drawings.

  Embodiments of an image forming apparatus according to the present invention will be described below with reference to the drawings. FIG. 1 is a front view illustrating an image forming apparatus including a sheet reversing device according to the embodiment. FIG. 2 is a front view illustrating the image forming apparatus in a state where the sheet reversing device is removed from the image forming apparatus illustrated in FIG. .

  The sheet reversing apparatus 100 according to this example is set as an optional product in the image forming apparatus 10. When the paper reversing device 100 is attached to the image forming apparatus 10, as shown in FIG. 1, in the image forming apparatus 10, the paper reversing device 12 (100) is disposed between the image forming unit 11 and the paper feeding device 13. The On the other hand, when the paper reversing device 100 is not set as an optional product, the image forming unit 11 is directly arranged on the paper feeding device 13 without providing the paper reversing device as shown in FIG. According to this example, when the paper reversing device 12 is unnecessary, the image forming device 10 can be configured by the image forming unit 11 and the paper reversing device 12, so that the height and weight of the entire image forming device are suppressed. be able to.

  Next, the sheet reversing device 12 (100) according to this example will be described. FIG. 3 is a front view showing the paper reversing device according to the embodiment, FIG. 4 is a perspective view showing the paper reversing device according to the embodiment, and FIG. FIG. 6 is a cross-sectional view illustrating a schematic structure of the sheet reversing device according to the embodiment.

  In this example, the paper reversing device 100 includes a paper reversing device housing 101 and a paper reversing device structure unit 102 stored in the paper reversing device housing 101. In this example, the paper reversing device structure 102 can be pulled out from the paper reversing device casing 101 as shown in FIG. When the jam processing is performed, the sheet reversing device structure 102 can be pulled out from the paper reversing device casing 101, and each part of the sheet reversing device structure 102 can be opened from the upper side, or the paper can be taken out.

  In addition, the sheet reversing device casing 101 is provided with an inlet conveyance guide plate 140 and an outlet conveyance guide plate 190 that can be opened and closed. That is, the inlet conveyance guide plate 140 can be opened and closed as shown in FIG. 7, and the outlet conveyance guide plate 190 can be opened and closed as shown in FIG. According to this example, in a state where the sheet reversing device structure unit 102 is stored in the sheet reversing device housing 101, the entrance conveyance guide plate 140 is opened, and the paper reversing device structure unit 102, which will be described later, is brought into the carry-in entrance 110. In addition to being able to perform jam processing, it is possible to perform jam processing at the carry-out port 115 of the sheet reversing device structure 102 described later with the exit conveyance guide plate 190 opened. For this reason, the paper reversing device structure 102 is pulled out from the paper reversing device casing 101 while the paper is jammed in the carry-in entrance 110 and the carry-out exit 115, and the paper is cut. It is possible to prevent the situation where the body 101 and the sheet reversing device structure 102 are separated.

  Next, the configuration of the sheet reversing device structure 102 will be described. In the paper reversing device 100 according to the present example, the paper reversing device structure unit 102 has the carry-in port 110 into which the paper printed by the image forming unit 11 is carried on one side, and the paper reversing device 100 to reverse the front and back. A carry-out port 115 through which the discharged paper is discharged again toward the image forming unit 11 is formed on both sides thereof.

  The paper carried in from the carry-in entrance 110 is carried through the carry path 120 and is carried to the switchback carry path 130, and is switched back in the switchback carry path 130 so that the front and back are reversed and carried out from the carry-out exit 115.

  In this example, the conveyance path 120 is divided into a left conveyance path 121 and a right conveyance path 122, the left conveyance path 121 is between the upper left conveyance guide plate 150 and the lower left conveyance guide plate 160, and the right conveyance path 122 is the upper right conveyance path. It is formed between the conveyance guide plate 170 and the lower right reverse conveyance guide plate 180. In order to form the left conveyance path 121 and the right conveyance path 122, on the lower side of the upper left conveyance guide plate 150, the upper side of the lower left conveyance guide plate 160, the lower side of the upper right conveyance guide plate 170, and the upper side of the lower right reverse conveyance guide plate 180. Has a roller that is rotated by a driving source such as a motor.

  Further, in this example, the switchback conveyance path 130 is divided into a left switchback path 131 and a right switchback path 132, and the left switchback path 131 includes a lower left conveyance guide plate 160, a sheet reversing device structure portion. The right switchback passage 132 is formed between the lower right reverse conveyance guide plate 180 and the bottom portion 103. In this example, the right conveyance path 122 and the right switchback path 132 form a semicircular turning path 134 at the end of the lower right reverse conveyance guide plate 180. In this example, rollers that are rotationally driven by a driving source such as a motor are arranged below the lower right reverse conveyance guide plate 180 and below 103.

  First, the upper left conveyance guide plate 150 and the lower left conveyance guide plate 160 constituting the left conveyance path 121 and the left switchback passage 131 will be described. In this example, the upper left transport guide plate 150 is pivotally supported by a support shaft 135 disposed in the vicinity of the center portion of the sheet reversing device structure 102, and the lower left transport guide plate 160 is supported in the vicinity of the support shaft 135. The shaft 136 is pivotally supported.

  The upper left conveyance guide plate 150 and the lower left conveyance guide plate 160 are connected to the bottom portion 103 by a left front conveyance guide plate link 210 that interlocks the upper left conveyance guide plate 150 and the lower left conveyance guide plate 160. The lower left conveyance guide plate 160 is connected to the bottom portion 103 by a left rear conveyance guide plate link 220 that regulates the rotation amount of the upper left conveyance guide plate 150 and the lower left conveyance guide plate 160. The movement of the upper left conveyance guide plate 150 and the lower left conveyance guide plate 160 is restricted by the left front conveyance guide plate link 210 and the left rear conveyance guide plate link 220, and one of the left conveyance path 121 and the left switchback path 131 is selected. When the opening operation is performed so as to expose the conveyance path, an operation of largely exposing the other conveyance path is performed.

  As shown in FIG. 9, the left front conveyance guide plate link 210 is pivotally supported by a shaft 212 on the upper left conveyance guide plate 150 and includes a connecting rod 211 having a long hole 213. A slide shaft 214 erected on the conveyance guide plate 160 is slidably disposed in the elongated hole 123 of the connecting rod 211.

  This left front conveyance guide plate link 210 is the opposite axis of the upper left conveyance guide plate 150 in a state where the upper left conveyance guide plate 150 and the lower left conveyance guide plate 160 overlap to form the left conveyance path 121 and the left switchback passage 131. When the support side is lifted, the slide shaft 214 moves in the elongated hole 213, and when the upper left conveyance guide plate 150 is moved by a predetermined amount, the slide shaft 214 reaches the end of the elongated hole 213, and the upper left conveyance guide plate 150 moves. In conjunction with this, the lower left conveyance guide plate 160 is lifted around the support shaft 135.

  Further, as shown in FIG. 10, the left rear conveyance guide plate link 220 is disposed on the lower left conveyance guide plate 160 and regulates the movement range of the upper left conveyance guide plate 150 and the lower left conveyance guide plate 160. That is, as shown in FIG. 10, the left back conveyance guide plate link 220 includes a connecting rod 211 that is pivotally supported by a shaft 212 and provided with a long hole 223 at the bottom of the sheet reversing device structure 102. A slide shaft 224 erected on the lower left conveyance guide plate 160 is slidably disposed in the elongated hole 223 of the connecting rod 221 in the elongated hole 223.

  This left back conveyance guide plate link 220 is the opposite axis of the upper left conveyance guide plate 150 in a state where the upper left conveyance guide plate 150 and the lower left conveyance guide plate 160 are overlapped to form the left conveyance path 121 and the left switchback passage 131. When the support side is lifted, the slide shaft 224 moves in the elongated hole 223 of the connecting rod 221, and when the upper left conveyance guide plate 150 is moved by a predetermined amount), the slide shaft 224 reaches the end of the elongated hole 223 and the upper left conveyance guide. The movement of the plate 150 and the lower left transport guide plate 160 is stopped. In this example, in this state, the upper left conveyance guide plate 150 is opened at about 110 degrees, the lower left conveyance guide plate 160 is opened at about 60 degrees, the left conveyance path 121 and the left switchback path 131 are opened, and jam processing is performed. It can be easily performed.

  Next, the upper right conveyance guide plate 170 and the lower right reverse conveyance guide plate 180 constituting the right conveyance path 122 and the right switchback passage 132 will be described. In this example, the upper right transport guide plate 170 is pivotally supported by a support shaft 135 that supports the upper left transport guide plate 150 in common with the support shaft 135, and the lower right reverse transport guide plate 180 is provided in the vicinity of the support shaft 135. The shaft is supported by a slanted support shaft 137. Further, the upper right transport guide plate 170 and the lower right reverse transport guide plate 180 are connected to the bottom portion 103 by a right front transport guide plate link 250 that interlocks the upper right transport guide plate 170 and the lower right reverse transport guide plate 180. The support shaft of the upper right transport guide plate 170 can be provided separately from the support shaft of the upper left transport guide plate 150.

The lower right reverse conveyance guide plate 180 is connected to the bottom portion 103 by a right rear conveyance guide plate link 260 that regulates the rotation amount of the upper right conveyance guide plate 170 and the lower right reverse conveyance guide plate 180. The movement of the upper right conveyance guide plate 170 and the lower right reverse conveyance guide plate 180 is restricted by the right front conveyance guide plate link 250 and the right rear conveyance guide plate link 260, and among the right conveyance path 122 and the right switchback path 132, When the opening operation is performed so as to expose one of the conveyance paths, an operation of greatly exposing the other conveyance path is performed.

  As shown in FIG. 11, the right front conveyance guide plate link 250 is pivotally supported by a right upper conveyance guide plate 170 by a shaft 252 and includes a connecting rod 251 having a long hole 253. A slide shaft 254 erected on the lower reverse conveyance guide plate 180 is slidably disposed in the elongated hole 253 of the connecting rod 251.

  The right front transport guide plate link 250 is formed by the upper right transport guide plate 170 and the lower right reverse transport guide plate 180 being overlapped to form the right transport path 122, the left switchback path 131, and the turning path 134. When the opposite side of the plate 170 is lifted, the slide shaft 254 moves in the elongated hole 253, and when the upper right conveyance guide plate 170 is moved by a predetermined amount, the slide shaft 254 reaches the end of the elongated hole 253, and the upper right conveyance is performed. In conjunction with the movement of the guide plate 170, the lower right reverse conveyance guide plate 180 is lifted around the support shaft 135.

  Further, as shown in FIG. 12, the right rear conveyance guide plate link 260 is disposed on the lower right reverse conveyance guide plate 180 and regulates the movement range of the upper right conveyance guide plate 170 and the lower right reverse conveyance guide plate 180. That is, as shown in FIG. 12, the right rear conveyance guide plate link 260 includes a connecting rod 261 that is pivotally supported by a shaft 262 and provided with a long hole 263 at the bottom of the sheet reversing device structure 102. A slide shaft 224 erected on the lower right reverse conveyance guide plate 180 is slidably disposed in the elongated hole 223 of the connecting rod 221 in the elongated hole 263.

  This right rear conveyance guide plate link 260 is formed in a state where the upper right conveyance guide plate 170 and the lower right reverse conveyance guide plate 180 are overlapped to form the right conveyance path 122, the right switchback path 132, and the turning path 134. When the opposite side of the plate 170 is lifted, the slide shaft 264 moves in the elongated hole 263 of the connecting rod 261. When the upper right transport guide plate 170 is moved by a predetermined amount (in this example, about 60 degrees), the slide The shaft 264 reaches the end of the long hole 263 and stops the movement of the upper right transport guide plate 170 and the lower right reverse transport guide plate 180. In this example, in this state, the upper right transport guide plate 170 is about 110 degrees and the lower right reverse transport guide plate 180 is opened about 60 degrees, and the right transport path 122, the right switchback path 132, and the turning path 134 are large. It will be in an open state and jam processing can be performed easily.

  In this example, the transport path 120 and the switchback transport path 130 are divided into left and right, and a plurality of upper left transport guide plates 150, lower left transport guide plates 160, and upper right transport guide plates 170, lower right reverse transport guide plates, which are a plurality of constituent members. Therefore, when the transport path 120 and the switchback transport path 130 are opened by the same opening / closing angle as compared to a single component, the occupied space associated with the opening and closing can be reduced, and therefore, a single component can be obtained. In comparison, jam processing can be easily performed in a small occupied space.

  In this example, the upper left conveyance guide plate 150, the lower left conveyance guide plate 160, the upper right conveyance guide plate 170, and the lower right reverse conveyance guide plate 180 are supported on the central side of the conveyance path 120 or the switchback conveyance path 130. Since the shaft 135, the support shaft 136, and the support shaft 137 are rotated, the jam can be easily processed as compared with the case where the fulcrum is provided on the end side and the central portion side of each member is opened and closed.

  In the above embodiment, the conveyance path and the switchback conveyance path are divided into left and right, and the respective conveyance paths are divided into an upper left conveyance guide plate 150, a lower left conveyance guide plate 160, an upper right conveyance guide plate 170, and a lower right reverse conveyance guide. Although the configuration example has been described with the plate 180, the conveyance path and the switchback conveyance path may not be divided, or may be divided into three or more.

  In the above embodiment, the switchback conveyance path is opened in conjunction with the opening of the conveyance path, but the conveyance path can be opened in conjunction with the opening of the switchback conveyance path.

  In the above embodiment, the lower left conveyance guide plate 160 and the lower right reverse conveyance guide plate 180 constituting the switchback conveyance path 130 are the upper left conveyance guide plate 150 and the lower right reverse conveyance guide plate, which are components of the conveyance path 120. Although it is arranged to face 180, the constituent member of the switchback conveyance path 130 may be arranged without facing the constituent member of the conveyance path 120 and may not face the conveyance path. For example, in FIG. 6, the lower left conveyance guide plate 160 and the lower right reverse conveyance guide plate 180 are fixed, and the bottom 103 opens and closes as a member constituting the switchback conveyance path.

  Furthermore, in the above example, the example in which the conveyance path and the switchback conveyance path overlap with each other when viewed from the carry-in entrance side has been described, but the conveyance path and the switchback conveyance path may be arranged so as not to overlap.

  In the above example, the conveyance path has been described with respect to the case where the sheet is conveyed to the switchback conveyance path. However, the conveyance path is arranged so as to convey the sheet carried from the switchback conveyance path to the carry-out port. May be.

  In the above example, the carry-in port and the carry-out port are arranged on the upper surface of the sheet reversing device, but the carry-in port and the carry-out port may be arranged on separate surfaces. Further, although the example in which the sheet reversing device is provided between the image forming apparatus main body and the paper feeding device has been described, the arrangement position of the paper reversing device is not limited to this, and may be disposed on the side surface of the main body. .

1 is a front view illustrating an image forming apparatus including a sheet reversing device according to an embodiment. FIG. 2 is a front view illustrating the image forming apparatus in a state where a sheet reversing device is removed from the image forming apparatus illustrated in FIG. 1. It is a front view which shows the paper inversion apparatus based on an Example. It is a perspective view which shows the paper inversion apparatus based on an Example. FIG. 6 is a perspective view illustrating a state where the sheet reversing device main body is pulled out from the housing of the sheet reversing device in the sheet reversing device according to the embodiment. It is sectional drawing which shows schematic structure of the paper inversion apparatus based on an Example. It is a perspective view which shows the state which opened the entrance guide plate of the paper reversing apparatus which concerns on an Example. It is a perspective view which shows the state which opened the exit guide plate of the paper reversing apparatus which concerns on an Example. It is a perspective view which shows the state which the left guide plate of the paper inverting apparatus based on an Example opened. FIG. 10 is a perspective view of the sheet reversing device in the state illustrated in FIG. 9 as viewed from the opposite direction. It is a perspective view which shows the state which the right guide plate of the paper inverting apparatus based on an Example opened. It is the perspective view which looked at the paper inversion apparatus of the state shown in FIG. 11 from the opposite direction. It is a front view which shows the conventional image forming apparatus. It is a front view which shows the other conventional image forming apparatus. FIG. 15 is a perspective view illustrating a state where the image forming apparatus main body and the sheet reversing device of the image forming apparatus illustrated in FIG. 14 are separated.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Image forming apparatus 11 Image forming part 12 Paper reversing apparatus 13 Paper feeding apparatus 100 Paper reversing apparatus 101 Paper reversing apparatus housing | casing 102 Paper reversing apparatus structure part 103 Bottom part 110 Carriage inlet 115 Carriage outlet 120 Carriage path 121 Left conveyance path 122 Right side Transport path 123 Long hole 130 Switchback transport path 131 Left switchback path 132 Right switchback path 134 Turning path 135 Support shaft 136 Support shaft 137 Support shaft 140 Inlet transport guide plate 150 Upper left transport guide plate 160 Lower left transport guide plate 170 Upper right transport Guide plate 180 Lower right reverse conveyance guide plate 190 Exit conveyance guide plate 210 Left front conveyance guide plate link 211 Connecting rod 212 Axis 213 Long hole 214 Slide shaft 220 Left rear conveyance guide plate link 221 Connecting rod 223 Long hole 224 Slide shaft 250 Right hand Front transport guide plate Link 251 Connecting rod 252 Shaft 253 Long hole 254 Slide shaft 260 Back right conveyance guide plate link 261 Connecting rod 262 Shaft 263 Long hole 264 Slide shaft

Claims (14)

It has a paper carry-in port, a paper carry-out port, a carrying path for carrying the paper in one direction, and a switchback carrying path for switching back the paper carrying direction, and the paper carried from the carry-in port is turned upside down. A sheet reversing device for discharging to a carry-out port,
When a link member is provided between the member constituting the conveyance path and the member constituting the switchback conveyance path, and an opening operation is performed to expose one of the conveyance path and the switchback conveyance path. The sheet reversing apparatus is characterized in that the other opening operation for exposing the other conveyance path is performed synchronously. A conveying path forming member arranged facing the conveying path and configured to be openable and closable;
A switchback conveying path constituting member arranged facing the switchback conveying path and configured to be openable and closable;
2. The sheet reversing device according to claim 1, wherein the link member opens the other in conjunction with an opening operation of one of the transport path constituent member and the switchback transport path constituent member. .   The sheet reversing device according to claim 2, wherein the conveyance path constituting member includes a plurality of conveyance path constituting member elements that are respectively arranged to face different portions of the conveyance path.   3. The sheet reversing device according to claim 2, wherein the switchback transport path constituent member includes a plurality of switchback transport path constituent member elements each facing a different part of the switchback transport path.   The plurality of transport path constituent members or the plurality of switchback transport path constituent members are configured to be rotatable around a fulcrum on the center side in the transport path or the switchback transport path. 5. The sheet reversing device according to claim 3, wherein the switchback conveying path is opened and closed.   6. The sheet reversing device according to claim 3, wherein the plurality of conveyance path constituting members or the plurality of switchback conveyance path constituting portions are supported by a fulcrum serving as a common rotation center.   7. The sheet reversing device according to claim 2, wherein the switchback conveyance path constituting member is disposed to face the conveyance path constituting member and also constitutes the conveyance path.   The sheet reversing device according to claim 1, wherein the conveyance path and the switchback conveyance path are arranged so as to overlap each other when viewed from the carry-in entrance side.   9. The sheet reversing device according to claim 1, wherein the transport path is disposed so as to transport a sheet carried from the carry-in entrance to the switchback transport path.   10. The paper reversing device according to claim 1, wherein the carry-in port and the carry-out port are disposed on the same surface of the paper reversing device.   2. A paper reversing device housing and a paper reversing device main body disposed in the paper reversing device housing, wherein the paper reversing device temperature zone is formed so as to be able to be pulled out from the paper reversing device housing. 10. The paper reversing device according to any one of 10 to 10.   An image forming apparatus comprising: a main body that forms an image on a sheet; and a sheet reversing device according to claim 1 that is detachably disposed below the main body. It has a paper entrance, a paper exit, a transport path that transports the paper in one direction, and a switchback transport path that switches back the transport direction of the paper. A paper reversing section to be discharged to the carry-out port;
An image forming apparatus including an image forming apparatus main body unit that includes a paper feed tray and forms an image on paper,
The image forming apparatus, wherein the reversing unit is detachably disposed below the main body unit.
The image forming apparatus according to claim 13, wherein the reversing unit is disposed to support the main body.