JP4189281B2 - Image forming apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an image forming apparatus such as an electrophotographic copying machine provided with a manual sheet feeder.
[0002]
[Prior art]
Conventionally, an image forming unit is built in the upper part of the apparatus main body, a paper feeding unit is provided below the image forming unit, a manual paper feeding device is provided above the paper feeding unit, and the manual paper fed from the manual paper feeding device is disposed. An image forming apparatus is known that can feed a sheet taken out from a sheet feeding unit into a conveying path that leads to an image forming unit and supply the sheet to the image forming unit through the conveying path (see, for example, Patent Document 1). .)
[0003]
[Patent Document 1]
JP 2002-265072 A (paragraphs 0020-0032, paragraphs 0038-0040, FIGS. 1 to 4)
[0004]
[Problems to be solved by the invention]
In the image forming apparatus of Patent Document 1, there is no description about the jam processing around the manual sheet feeding device, and the manual sheet feeding device is not configured to be displaced corresponding to the jam processing on the conveyance path.
[0005]
By the way, in a configuration in which a part of the conveyance path from the sheet feeding unit to the image forming unit is provided on the back side of the apparatus as viewed from the manual sheet feeding device, it is possible to perform jam processing on the partial conveyance path. The opening / closing cover is attached to the apparatus main body. An image forming apparatus having such a configuration is shown in FIG.
[0006]
In FIG. 7, reference numeral 111 denotes an apparatus main body, reference numeral 112 denotes an image forming unit, reference numeral 113 denotes a paper feeding unit, reference numeral 114 denotes a manual paper feeding device having a manual tray 114a on which manual paper 115 is placed, and reference numeral 116 denotes an opening / closing cover. Respectively. The manual sheet feeder 114 is provided at a position higher than the sheet feeder 113. The opening / closing cover 116 is attached to the apparatus main body 111 so as to be rotatable about its lower end. In FIG. 7, a dotted arrow indicates a sheet conveyance path from the sheet feeding unit 113 to the image forming unit 112.
[0007]
Since the opening / closing cover 116 is rotated, a part of the conveyance path provided above the manual sheet feeding device 114 is opened / closed. Therefore, if necessary, the opening / closing cover 116 can be opened to perform jam processing. However, like the above-described Patent Document 1, the manual sheet feeder 114 is not displaced in accordance with the jam processing.
[0008]
For this reason, when the jam processing is performed to remove the paper jammed in the conveyance path, the manual paper feeder 114 becomes an obstacle even if the opening / closing cover 116 is opened. Therefore, it is difficult to remove the paper jammed in the conveyance area (the length in the conveyance direction of this area is indicated by a symbol X in FIG. 7) extending from the paper supply unit 113 to the fulcrum of the opening / closing cover 116, and improvement is desired. It is rare.
[0009]
  The problem to be solved by the present invention is that the jam handling around the manual sheet feeder is easy.In addition, during this jam processing, the manual paper is not dropped from the manual paper tray.An object is to provide an image forming apparatus.
[0010]
[Parts for solving problems]
  In order to solve the above-described problems, the present invention provides an open / close cover that is opened when a paper path taken out from a paper feeding unit at the lower part of the apparatus main body is jammed in a conveyance path that guides the paper to the upper image forming part. The lower end of the apparatus body is pivotally provided with a lower end portion as a fulcrum, and the conveyance path is provided with a fixed paper guide and movable paper provided with the lower end portion as a fulcrum so as to be opened and closed with respect to the fixed paper guide. When the manual paper is fed to the introduction section, and a manual paper introduction section that is arranged to face the guide on the opening side of the movable paper guide and guides the manual paper to the conveyance path.Over the use position that is placed and the non-use position that is perpendicularA manual feed device having a rotatable manual feed tray is arranged with a first position that enables manual feed to the conveyance path in a state in which the manual feed tray is rotated to the use position, The main body of the apparatus over the second position that is out of the movable area of the movable paper guide.Horizontal reciprocationMoveableAnd the manual sheet feeder is disposed at the second position in a state where the manual tray is disposed at the use position during the jam processing.In addition, the posture in which the manual feed tray is disposed at the use position is maintained between the first position and the second position.
[0011]
  In the present invention, when the opening / closing cover is opened and the jamming of the transport path is performed, the manual paper introduction unit of the manual paper feeder is retracted to the second position outside the movable area of the movable paper guide included in the transport path. Can do. As a result, the movable paper guide can be opened from the fixed paper guide without being obstructed by the manual paper introduction section, so that the manual paper feeding device is prevented from interfering with the jam processing, and the paper feed on the conveyance path is suppressed. It is possible to easily remove paper jammed in close proximity. Moreover, in this jam processing,Since the manual sheet feeder is placed in the second position after the manual feed tray is placed at the use position,Even if manual paper is placed on the manual paper feed tray, the manual paper does not fall off, and there is no need to remove this paper.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
[0013]
In FIG. 1 and FIG. 2, reference numeral 1a denotes a copying machine main body as an apparatus main body included in an image forming apparatus, for example, an electrophotographic copying machine 1. An image forming unit 1A is built in the upper part of the copying machine main body 1a, and a paper feeding unit 1B having a plurality of paper feeding cassettes 24 is provided in the lower part of the copying machine main body 1a.
[0014]
The image forming unit 1A will be described with reference to FIG. 2 showing the internal structure of the copying machine main body 1a.
[0015]
In the copying machine main body 1a, a photosensitive drum 2 as an image carrier is rotatably provided. A charging unit 5 for charging the surface of the photosensitive drum 2 to a predetermined potential along the rotation direction thereof, a monochrome developing device 8B for developing an electrostatic latent image, and a color developer are disposed around the photosensitive drum 2. 8A, an intermediate transfer belt 3 for temporarily transferring a developer image, and a cleaner 6 for removing residual toner on the photosensitive drum 2 are provided.
[0016]
The color rotary developing device 8A includes a first developing unit 8a that supplies yellow toner, a second developing unit 8b that supplies cyan toner, and a third developing unit 8c that supplies magenta toner. .
[0017]
The intermediate transfer belt 3 is stretched between the first to fourth rollers 3 a to 3 d with a predetermined tension, and is pressed against the photosensitive drum 2 by the primary transfer roller 12. A cleaner 15 a that cleans the intermediate transfer belt 3 is in contact with a portion of the intermediate transfer belt 3 that is wound around the first roller 3 a.
[0018]
An exposure device 4 that forms an electrostatic latent image on the photosensitive drum 2 is provided below the developing devices 8A and 8B.
[0019]
Below the exposure device 4, a paper feed unit 1 </ b> B containing a paper feed cassette 24 is provided. The paper feed cassette 24 is provided with a pickup roller 7 for taking out paper. The paper taken out by the pickup roller 7 is separated and sent out one by one by the paper feed roller 15 and the separation roller 16, and is conveyed along the conveyance path 19.
[0020]
The conveyance path 19 is provided so as to extend in the vertical direction along the one side wall 1aw toward the one side wall 1aw (see FIGS. 1 and 3) of the copying machine main body 1a. One side wall 1aw has an opening for carrying out jam processing by exposing the conveyance path 19.
[0021]
In the transport path 19, a paper guide pair 31, a transport roller pair 9, a registration roller pair 17, and a secondary transfer roller 11, which will be described later, are sequentially disposed along the paper transport direction. The registration roller pair 17 temporarily stops the conveyed sheet, corrects the inclination of the sheet with respect to the conveying direction, and aligns the leading end of the sheet with the leading end of the toner image on the intermediate transfer belt 3.
[0022]
On the downstream side of the secondary transfer roller 11 in the paper conveyance direction, a fixing device 13 for fixing the toner image transferred onto the paper to the paper is disposed. The fixing device 13 includes a heating roller 13a and a pressure roller 13b.
[0023]
A discharge roller 20 that discharges the sheet is provided on the downstream side of the fixing device 13 in the sheet conveyance direction. On the carry-out side of the discharge roller 20, a discharge tray 21 for receiving discharged paper is provided.
[0024]
The printing operation of the electrophotographic copying machine 1 having the above configuration will be described.
[0025]
First, a document is set on a document transport unit (not shown), and a copy button on an operation panel (not shown) is turned on. As a result, the document is conveyed and set, and is optically read by a reading device (not shown). At this time, the surface of the photosensitive drum 2 is uniformly charged by the charging unit 5. The charged photosensitive drum 2 is irradiated with information light corresponding to the read information by the exposure device 4 to form an electrostatic latent image.
[0026]
Since the electrostatic latent image is sent to the developing device 8B or the developing device 8A by the rotation of the photosensitive drum 2, black toner is supplied from the developing device 8B, or each toner of cyan, magenta, and yellow is supplied from the developing device 8A. Is supplied and developed. The developed toner image is sent onto the intermediate transfer belt 3 by the rotation of the photosensitive drum 2 and is primarily transferred by the primary transfer roller 12. After the transfer, the photosensitive drum 2 is subjected to light neutralization by a static eliminator (not shown). The toner remaining on the photosensitive drum 2 is cleaned by the cleaner 6.
[0027]
On the other hand, the sheet supplied from the sheet feeding cassette 24 through the conveyance path 19 is sent between the intermediate transfer belt 3 and the secondary transfer roller 11 in synchronism with the above operation. The toner image on the intermediate transfer belt 3 is secondarily transferred to this sheet. After the transfer, the sheet is peeled off from the intermediate transfer belt 3 and sent to the fixing device 13, and the toner image is heated and pressurized by the fixing device 13 to be fixed. After this fixing, the sheet is discharged to the outside via the discharge roller 20 and placed on the discharge tray 21.
[0028]
As shown in FIGS. 3 and 4, the paper guide pair 31 provided in the transport path 19 includes a fixed paper guide 32 and a pair of upper and lower movable paper guides 33 and 34. An inlet 31 a formed at the lower end portion of the paper guide pair 31 is located on the paper carry-out side of the pair of paper feed rollers 15 and separation rollers 16 and is close to this roller pair. The fixed paper guide 32 is made of a guide plate.
[0029]
The movable paper guide 34 in the lower position is attached to the copying machine main body 1a so as to be rotatable about the lower end portion thereof. 3 and 4, reference numeral 35 denotes a pivot that forms a fulcrum of the movable paper guide 34. The movable paper guide 34 is disposed to face the lower portion of the fixed paper guide 32.
[0030]
The lower end portion of the movable paper guide 33 in the upper position and the upper end portion of the movable paper guide 34 are connected by a pivot 36, and the movable paper guide 33 freely rotates with respect to the movable paper guide 34 about the pivot 36. Is possible. The movable paper guide 33 is disposed to face the upper part of the fixed paper guide 32. One side surface of the movable paper guide 33 that faces the fixed paper guide 32 forms a first paper guide surface that guides the paper from the paper supply unit 1B. The other side surface of the movable paper guide 33 located on the side opposite to the one side surface forms a second paper guide surface for guiding the manual paper P (see FIG. 1). An interlocking engagement convex portion 37 is provided on the second paper guide surface at a position that does not prevent the manual paper P from being conveyed. The engaging projection 37 is positioned above the pivot 36.
[0031]
The pair of upper and lower movable paper guides 33 and 34 are inclined in the clockwise direction in FIG. In other words, the paper guide pair 31 is made open.
[0032]
Note that reference numerals 41 and 42 in FIGS. 3 and 4 denote fixed paper guides provided to extend in the vertical direction in the paper feeding unit 1B opposite to each other. The upper ends of the conveyance paths in the sheet feeding unit formed in the sheet guides 41 and 42 communicate with the inlet 31 a of the sheet guide pair 31. Therefore, the sheet from the sheet feeding cassette 24 rising through this conveyance path is carried into the sheet guide pair 31.
[0033]
The copying machine main body 1a is provided with an opening / closing cover 51 that opens and closes an opening of the one side wall 1aw, a manual sheet feeding device 61, and an automatic duplex device unit 81 that covers the opening / closing cover 51.
[0034]
The opening / closing cover 51 is pivotally attached to the closed position shown in FIG. 3 and the open position shown in FIG. 3 and 4, reference numeral 52 denotes a pivot that forms a fulcrum of the opening / closing cover 51. The pivot 52 is located above the pivots 35 and 36. A magnet 53 is attached to the upper end of the opening / closing cover 51, and the opening / closing cover 51 closes the opening of the one side wall 1aw by magnetically attracting the magnet 53 to the iron piece 54 provided in the copying machine main body 1a. Retained. The open / close cover 51 in the closed position can be opened manually.
[0035]
The secondary transfer roller 11 is supported on the opening / closing cover 51. The opening / closing cover 51 has a paper guide 51a at its lower part. This sheet guide 51a approaches and opposes the second sheet guide surface of the movable sheet guide 33 when the open / close cover 51 is disposed at the closed position. The paper guide 51a is provided with an engaging convex portion 55 for interlocking at a position above the pivot 52 and not hindering the conveyance of the manual paper P. The engaging convex portion 55 can be brought into and out of contact with the engaging convex portion 37. That is, the engaging convex portion 55 is separated from the engaging convex portion 37 in a state where the opening / closing cover 51 is disposed at the open position. On the contrary, as the opening / closing cover 51 is rotated from the open position to the closed position, the engaging convex portion 55 comes into contact with the engaging convex portion 37, and the contact state is maintained after this contact. The movable paper guides 33 and 34 are rotated in a direction in contact with the fixed paper guide 32.
[0036]
The opening / closing cover 51 has a paper passage 56 at the bottom thereof. The sheet path 56 guides the sheet to be printed on both sides guided by the automatic duplexing unit 81 toward the registration roller pair 17.
[0037]
The manual paper feeder 61 includes an upper manual paper introduction section 62, a lower manual paper introduction section 63, and a manual tray 64, which are respectively attached to the apparatus frame 61a. The manual paper introduction sections 62 and 63 paired vertically are provided on the opening side of the movable paper guides 33 and 34 in order to guide the manual paper P inserted manually from the manual tray 64 into the conveyance path 19. ing. The lower manual paper introduction section 63 has a slanted introduction guide wall 65 that guides the manual paper. A separation roller 66 exposed to an intermediate portion of the introduction guide wall 65 is attached to the manual paper introduction portion 63. A paper feeding roller 67 that is in rolling contact with the separation roller 66 is attached to the upper manual paper feeding section 62.
[0038]
The manual sheet feeding sections 62 and 63 are arranged at the first position shown in FIG. 3, that is, the set position that enables manual feeding to the transport path 19, and the second position shown in FIG. The movable paper guides 33 and 34 are provided so as to be reciprocally movable in the horizontal direction over the retracted position deviated from the movable region. In the state where the manual paper introduction sections 62 and 63 are arranged at the first position, the inclined upper end of the introduction guide wall 65 is located at the lower end of the passage between the second paper guide surface of the movable paper guide 33 and the paper guide 51a. The manual paper P that is disposed and guided to the introduction guide wall 65 can be guided to the conveyance path 19 through the passage.
[0039]
  The manual paper introduction portion 63 is provided with a pressing portion 65 a that contacts and separates from the movable paper guide 34. The pressing portion 65a is made of, for example, a portion bent downward from the inclined upper end portion of the introduction guide wall 65. The pressing portion 65a is provided with the receiving portion 34a of the movable paper guide 34 as the manual paper introduction portions 62 and 63 are arranged at the first position.PressThe paper guide pair 31 is kept closed. The pressing portion 65a allows the paper guide pair 31 to be opened away from the receiving portion 34a when the manual paper introducing portions 62 and 63 are arranged at the second position.
[0040]
Four links 71 forming a parallel link mechanism are provided in order to reciprocate the manual paper feed sections 62 and 63 integrally. Two links 71 are provided on each side of the manual sheet feeder 61 in the width direction. Each link 71 is pivotally attached at its upper end portion to the manual paper introduction portion 63 and at its lower end portion to a bracket 72 attached to the one side wall 1aw.
[0041]
The manual feed tray 64 is provided so as to be rotatable about a pivot shaft 74 over a horizontal use position and a vertical non-use position. This rotation is done manually. The manual feed tray 64 arranged at the use position is continuously arranged at the lower inclined end of the lower manual paper feed section 63. For this reason, paper can be fed by manually pushing in the manual paper P placed on the manual feed tray 64. 4 indicates a guide plate for positioning the manual sheet P on the manual tray 64.
[0042]
The manual sheet feeder 61 having the above-described configuration is always urged toward the second position by an urging member (not shown). A coil spring can be used for the urging body. The coil spring has one end connected to a fixed pivot supporting the lower end of the link 71 on the bracket 72, and the other end connected to the device frame 61a and held in a compressed state. The manual paper feeder 61 is urged by force.
[0043]
The automatic duplexer unit 81 has a reverse conveyance path 82 for conveying a sheet to be printed on both sides. The automatic duplexer unit 81 is attached to the copying machine main body 1a so as to be rotatable about its lower end. 3 and 4, reference numeral 83 denotes a pivot that forms a fulcrum of the automatic duplexer unit 81.
[0044]
As shown in FIG. 3, the automatic double-sided device unit 81 can rotate between a closed position attached to and held on the one side wall 1aw and an open position shown in FIG. This rotation is done manually. The automatic duplexer unit 81 is placed at a closed position covering the opening / closing cover 51, and the outlet 82 a of the reverse conveying path 82 communicates with the sheet path 56 of the opening / closing cover 51 at the closed position. The automatic double-sided device unit 81 has an interlocking convex portion 84 that protrudes from its outlet 82a. When the automatic duplex device unit 81 is rotated from the open position to the closed position, the interlocking convex portion 84 comes into contact with the open / close cover 51 from the outer surface side to close the open / close cover 51.
[0045]
An interlocking member 86 having a hook shape is attached to a rotation lever 85 (only one is shown in FIG. 4) of the automatic duplex device unit 81 supported by the pivot 83. The interlocking member 86 can be engaged with and disengaged from an interlocking pin (not shown) provided in the upper manual sheet feeding portion 62 as the automatic duplexing unit 81 rotates. That is, when the automatic double-sided device unit 81 is disposed at the closed position shown in FIG. 3, the interlocking pin is engaged with the recess 86 a of the interlocking member 86. By this engagement, the manual sheet feeder 61 is held at the first position against the urging force of the coil spring. Further, in the state where the automatic double-sided device unit 81 is disposed at the open position shown in FIG. Extruded.
[0046]
In the normal state of the electrophotographic copying machine 1, as shown in FIG. 3, the paper guide pair 31 is closed, the open / close cover 51 and the automatic duplexer unit 81 are disposed at the closed positions, respectively, and manual feeding is performed. The paper device 61 is disposed at the first position (set position), and the manual feed tray 64 is erected substantially vertically so as to overlap the lower outer surface of the automatic duplex device unit 81.
[0047]
In this normal state, the paper in the paper feed cassette 24 of the paper feed unit 1B can be fed to the image forming unit 1A for printing. When double-sided printing is designated in this printing, the paper printed on one side passes through the reverse conveyance path 82 of the automatic double-sided apparatus unit 81 and is again fed to the image forming unit 1A via the conveyance path 19. And double-sided printing is performed.
[0048]
When manual feeding is required, the manual feed tray 64 is tilted so as to be in a horizontal posture as indicated by a two-dot chain line in FIG. 3, and then the manual feed paper P placed on the tray 64 is pushed in. The manual paper P can be fed to the image forming unit 1A via the conveyance path 19 for printing.
[0049]
When the paper is jammed in the conveyance path 19 in the above printing, the jam processing for removing the jammed paper can be performed according to the following procedure.
[0050]
First, after manually feeding the manual feed tray 64 to the horizontal position, the automatic double-sided device unit 81 disposed at the closed position is manually rotated and disposed at the open position. With this rotation, the interlocking member 86 and the interlocking pin of the manual paper feeder 61 are disengaged, so that the manual paper feeder 61 moves horizontally so as to be separated from the paper guide pair 31 and moves to the second position (retracted position). ). Thereby, the pressing of the movable paper guide 34 by the pressing portion 65a of the lower manual paper introducing portion 63 is released. Further, in this state, it is possible to perform jam processing on the paper jammed in the reverse conveyance path of the automatic duplex device unit 81 or the like.
[0051]
Next, the open / close cover 51 disposed at the closed position is manually rotated to be disposed at the open position. Along with this, the engaging convex portion 55 of the opening / closing cover 51 is disengaged from the engaging convex portion 37 of the upper movable paper guide 33, so that the restriction of the movable paper guide 33 by the opening / closing cover 51 is released. Therefore, the upper and lower movable paper guides 33 and 34 move away from the fixed paper guide 32 following the opening of the opening / closing cover 51 due to its weight balance. That is, the paper guide pair 31 is automatically opened so that its upper side is largely separated. FIG. 4 shows a state where the jam processing is possible.
[0052]
As described above, the manual paper feeder 61 can be retracted from the paper guide pair 31 and the paper guide pair 31 can be opened in conjunction with the operation of opening the open / close cover 51 after opening the automatic duplex device unit 81. it can. Therefore, the retraction operation of the manual sheet feeding device 61 and the opening operation of the paper guide pair 31 are unnecessary, and the labor for opening the conveyance path 19 is simple.
[0053]
In addition, the paper guide pair 31 in which most portions are arranged in the projection area of the manual paper introduction units 62 and 63 as viewed from the manual paper feeder 61, in other words, the paper guide pair 61 is disposed on the back side of the manual paper feeder 61. The sheet guide pair 31 on the conveying path 19 can be opened in conjunction with the opening of the opening / closing cover 51 without being obstructed by the manual sheet feeding device 61 as described above. The inlet 31 a at the lower end of the paper guide pair 31 thus opened is provided at a position close to the outlet of the paper feed cassette 24.
[0054]
Therefore, it is possible to easily remove the paper jammed near the paper feed unit 1B in the transport path 19.
[0055]
  After this jam processing, the state shown in FIG. 3 can be obtained by returning the automatic duplexer unit 81 to the closed position. In this case, the automatic double-sided device unit 81 to be closed can push the opening / closing cover 51 with the interlocking convex portion 84 and close the cover 51 in conjunction with it. At the same time, the engaging convex portion 55 of the opening / closing cover 51 to be closed comes into contact with the engaging convex portion 37 of the movable paper guide 33, so that the movable paper guide 33 is pushed toward the fixed paper guide 32. On the other hand, the interlocking member 86 of the automatic duplexing device unit 81 to be closed is engaged with an interlocking pin (not shown) of the manual sheet feeding device 61, and the manual sheet feeding device 61 is moved toward the paper guide pair 31 to press the pressing portion. Since 65a hits the receiving portion 34a of the movable paper guide 34,The movable paper guide 34It is pushed toward the fixed paper guide 32.
[0056]
As a result, the paper guide pair 31 is automatically closed, and the manual paper introduction units 62 and 63 of the manual paper feeder 61 are arranged in a state where the manual paper P can be fed to the conveyance path 19.
[0057]
  As described above, the jam processing of the conveyance path 19 by the user in the electrophotographic copying machine 1 does not require much labor and is in a deep place near the paper feeding unit 1B.forCan also be implemented easily. In this jam processing, even if the manual paper P is placed on the manual paper feed tray 64, the manual paper feeder 61 moves horizontally, so that the manual paper P does not fall off, and time and effort to remove the paper P are removed. Is not required.
[0058]
  The present invention is not limited to the first embodiment, and is shown in FIG.Reference exampleOr as shown in FIG.Second embodimentIt can be implemented as follows. theseReference example and secondSince the embodiment is basically the same as the first embodiment, the same reference numeral is assigned to the same configuration as the first embodiment, the description of the configuration and operation is omitted, and different parts will be described below. .
[0059]
  As shown in FIG.Reference exampleThe manual sheet feeder 61 is attached to the lower part of the opening / closing cover 51 pivotally supported by the copying machine main body 1a. Thus, in conjunction with the rotation of the opening / closing cover 51 between the closed position and the open position, the manual sheet feeding device 61 can be reciprocated across the set position indicated by the two-dot chain line and the retracted position indicated by the solid line in FIG. it can. When the manual paper feeder 61 is disposed at the retracted position, the contact between the engaging convex portions described in the first embodiment is released, so that the paper guide pair is opened and the manual paper feeder 61 is set. When placed at the position, the manual paper feeder 61 is pushed by the movable paper guide below the paper guide pair, and the paper guide pair is closed. The configurations other than the items described above are the same as those in the first embodiment.The same.
[0060]
  As shown in FIG.Second embodimentThen, a guide rail 91 extending in the horizontal direction is provided on one side wall 1aw of the copying machine main body 1a, and the manual sheet feeding device 61 is slidably supported on the rail 91. As a result, in conjunction with the rotation of the open / close cover 51 between the closed position and the open position, the manual paper feeder 61 is reciprocated horizontally between the set position indicated by the two-dot chain line and the retracted position indicated by the solid line in FIG. be able to. When the manual paper feeder 61 is disposed at the retracted position, the contact between the engaging convex portions described in the first embodiment is released, so that the paper guide pair is opened and the manual paper feeder 61 is set. When placed at the position, the manual paper feeder 61 is pushed by the movable paper guide below the paper guide pair, and the paper guide pair is closed. The configuration other than the items described above is the same as that of the first embodiment. Therefore, this third embodiment can also solve the problems of the present invention.
[0061]
【The invention's effect】
  According to the present invention, it is easy to handle jam around the manual sheet feeder.In addition, during this jam processing, the manual paper is not dropped from the manual paper tray.An image forming apparatus can be provided.
[Brief description of the drawings]
FIG. 1 is a schematic front view showing an electrophotographic copying machine according to a first embodiment of the present invention, with an automatic double-side mounting unit omitted.
FIG. 2 is a view showing the periphery of an image forming unit of the electrophotographic copying machine of FIG.
3 is a cross-sectional view showing a state around a manual sheet feeding device of the electrophotographic copying machine of FIG. 1 in a non-jam processing state.
4 is a cross-sectional view showing a state around a manual sheet feeding device of the electrophotographic copying machine of FIG. 1 in a jam processing state. FIG.
FIG. 5 shows the present invention.Reference exampleFIG. 2 is a schematic front view showing the electrophotographic copying machine according to the embodiment.
FIG. 6 of the present inventionSecond embodimentFIG. 2 is a schematic front view showing the electrophotographic copying machine according to the embodiment.
FIG. 7 is a schematic front view showing a conventional electrophotographic copying machine.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Electrophotographic copying machine (image forming apparatus), 1a ... Copying machine main body (apparatus main body), 1A ... Image forming part, 1B ... Paper feeding part, 9 ... Conveying roller pair (conveying path element), 11 ... Secondary transfer Roller (conveyance path element), 17 ... Registration roller pair (conveyance path element), 19 ... Conveyance path, 24 ... Paper feed cassette, 31 ... Paper guide pair, 32 ... Fixed paper guide, 33 ... Upper movable paper guide, 34 ... Lower movable paper guide, 35 ... Pivot, 36 ... Pivot, 37 ... Engaging projection for interlocking, 51 ... Opening / closing cover, 52 ... Pivot, 61 ... Manual paper feeder, 62 ... Upper manual paper feeder, 63: Lower manual paper feeding section, 64: Manual tray, P: Manual paper, 74: Pivot, 81: Automatic duplexer unit, 83 ... Pivot, 84: Interlocking convex part, 86 ... Interlocking member

Claims (3)

An apparatus main body with an image forming unit built in the upper part;
A paper feeder provided at the bottom of the apparatus body;
A fixed paper guide, and a movable paper guide that is pivotable about a lower end so as to be opened and closed with respect to the fixed paper guide, and forms an image of the paper taken out from the paper feed unit A conveyance path leading to the section,
An opening / closing cover that is pivotally provided in the apparatus main body with a lower end portion as a fulcrum, and is opened when jamming the conveyance path;
A manual paper introducing portion that is disposed on the opening side of the movable paper guide so as to face the guide and guides the manual paper to the conveyance path, and a use position that is perpendicular to the use position that is provided when the manual paper is fed to the introducing portion. a pivotable manual feed tray for the non-use position at which, in a state in which the manual feeding tray is rotated disposed in the use position, the first position and to allow the feeding to the transport path in the manual feed During the jam processing, the apparatus main body is provided so as to be reciprocally movable in a horizontal direction over a second position deviating from the movable region of the movable paper guide , and the manual feed tray is located at the use position in the second position. A manual paper feeder that is arranged to maintain a posture in which the manual tray is disposed at the use position at the first position and the second position;
An image forming apparatus comprising:   2. The image forming apparatus according to claim 1, wherein the manual sheet feeding portion and the manual tray are attached to an apparatus frame of the manual sheet feeder, and the manual sheet feeder is attached to the apparatus main body by a parallel link mechanism. It is provided to be movable. 3. The image forming apparatus according to claim 1, wherein the movable paper guide is composed of a pair of upper and lower movable paper guides rotatably connected by a pivot, and is separated from the fixed paper guide by their weight balance. It is open and open.

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