JP2019043711A - Image forming device - Google Patents

Abstract

To provide an image forming device which is simply constituted in terms of an operability of a hand tray and has a good operability.SOLUTION: An image forming device includes a door which is supported by a device body and in which an upper end side thereof is turned around a shaft at a lower end side, a hand tray supported by the door and constituted so that an upper end side is turned around a shaft at a lower end side, a feeding part for feeding a sheet mounted on the hand tray, an image forming part for forming an image on the sheet fed by the feeding part, a grip part disposed on the hand tray and gripped by an operator, and a wall member provided in a position overlapped with the grip part in a direction orthogonal to a feeding direction of the hand tray, and when the hand tray is changed in an angle in synchronization with turning of the door and inclined to an angle in which an upper end thereof is positioned below a turning center, the sheet mounted on the hand tray abuts against the wall member to thereby prevent the sheet from falling.SELECTED DRAWING: Figure 2

Description

  The present invention relates to the structure of a manual paper feed unit provided in an image forming apparatus.

  The image forming apparatus is provided with a door that can be opened and closed with respect to the main body of the apparatus, and is configured to be able to open the door to expose the conveyance path inside the apparatus at the time of jam processing, maintenance and inspection. reference). In the conventional image forming apparatus, as shown in FIGS. 10 and 11, the open / close door 20 is mounted on the right side surface of the apparatus main body 1, and when jamming is performed, the open / close door 20 is provided at the lower portion of the apparatus main body. It turns around a dynamic axis. As a result, the conveyance path in the image forming apparatus 1 is exposed, and jamming can be performed.

  The open / close door 20 is provided with a manual paper feed unit 17 on which sheets are stacked. When the manual feed unit 17 is used, the operator holds a handle provided on the front side of the manual feed unit in FIG. 11, opens the open / close door 20 to the open position, and Load it. Then, the image forming apparatus feeds the sheets stacked in the manual sheet feeding unit 17 one by one to perform image formation.

  At the time of the jam processing operation, the open / close door 20 may be rotated while an unused sheet is stacked on the manual sheet feeding unit. In this case, the manual paper feed unit also pivots in conjunction with the pivoting of the open / close door 20. As a result, there is a possibility that the upper end side of the manual sheet feeding unit 17 is inclined to an angle located below the rotation center, and the stacked unused sheets may fall to the ground. Therefore, in Patent Document 2, based on the detection of a jam, a sheet bundle on a manual feed tray is provided by a feed roller provided on the downstream upper side of the manual feed portion and a pressing plate capable of pressing on and off provided on the opposite side. Pinch. This prevents the paper bundle from falling.

JP, 2010-102124, A JP 2007-70044 A

  According to Patent Document 2, the fall of the sheet bundle is prevented by the presence of the pressing plate, but when such a member for preventing the sheet bundle from falling is specially provided, a new part, an electric control circuit, etc. are additionally added. It must be provided, leading to an increase in the size and cost of the device.

  An object of the present invention is to provide an inexpensive image forming apparatus without increasing the size of the apparatus or increasing the cost.

  In order to achieve the above object, an image forming apparatus according to the present invention includes an apparatus main body, a door supported by the apparatus main body, and a door whose upper end is pivoted about a lower end shaft, and supported by the door A manual feed tray configured to rotate the upper end side about a side shaft, a feeding unit configured to feed sheets stacked on the manual feed tray, and a feeding unit configured to feed the sheets. An image forming unit for forming an image on a fed sheet, a grip portion provided on the manual feed tray and grasped by an operator when the manual feed tray is rotated in a direction away from the door, and a sheet feeding direction A wall member provided at a position overlapping with the handle portion in a direction orthogonal to the wall portion, the wall member being displaced in conjunction with the rotation of the door, the angle of the manual tray being displaced, the manual tray The upper end is below the rotation center When tilted to an angle that location, characterized in that it is configured to fall the paper is prevented by sheets stacked abuts the manual feed tray.

  According to the present invention, it is possible to prevent paper from falling when the manual feed tray is inclined with a simple and inexpensive configuration. Therefore, it is possible to open the open / close door without removing even if there is paper in the manual feed tray when jamming.

Sectional view showing a schematic configuration of an image forming apparatus Perspective view showing the right door A perspective view showing the relationship between the extension tray and the manual feed tray cover A perspective view showing the opposite side to the loading surface of the manual feed tray A perspective view showing the manual feed tray closed against the right door Sectional view showing the manual feed tray closed against the right door Sectional view showing the manual feed tray closed against the right door Sectional view showing the manual feed tray in the open state Sectional view showing a state in which the right door with respect to the apparatus main body and the manual feed tray with respect to the right door are opened A sectional view showing a state in which a right door is opened with respect to an apparatus main body related to a conventional image forming apparatus The perspective view which showed the state which open | released the manual feed tray with respect to the right door which concerns on the conventional image forming apparatus

〔Example〕
Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings.

(Image forming device)
FIG. 1 is a cross-sectional view showing the configuration of a color electrophotographic image forming apparatus. The apparatus main body 1 of the image forming apparatus includes four drum-shaped image carriers, ie, photosensitive drums 2 (2a, 2b, 2c, 2d) arranged in parallel in a substantially horizontal direction as an image carrier. . The photosensitive drum 2 is rotationally driven clockwise in FIG. 1 by a driving unit (not shown). The image forming apparatus includes the charging device 3 (3a, 3b, 3c, 3d), the scanner unit 4 (4a, 4b, 4c, 4d), the developing device 5 (5a, 5b, 5c, 5d), and the cleaning device 6 (6a). , 6b, 6c, 6d).

  The charging device 3 uniformly charges the surface of the photosensitive drum 2. The scanner unit 4 emits a laser beam based on the image information to form an electrostatic latent image on the photosensitive drum 2. The developing device 5 causes a toner provided with a developer to be attached to the electrostatic latent image and develops it as a toner image. The cleaning device 6 removes transfer residual toner remaining on the surface of the photosensitive drum 2 after transfer.

  In the image forming apparatus of the present embodiment, the photosensitive drum 2, the charging device 3, the developing device 5, and the cleaning device 6 are configured as an integral cartridge unit, and different colors (yellow, cyan, magenta, black, etc.) according to the electrophotographic recording method. Form an image).

  The primary transfer rollers 7 (7 a, 7 b, 7 c, 7 d) are in contact with the photosensitive drum 2 via the intermediate transfer belt 8, and transfer the toner image on the photosensitive drum 2 to the intermediate transfer belt 8. The intermediate transfer belt 8 is stretched between a drive roller 9 and a tension roller 10, and is rotated counterclockwise by the drive of the drive roller 9. The secondary transfer roller 11 provided at a position facing the driving roller 9 via the intermediate transfer belt 8 transfers the toner image transferred to the intermediate transfer belt 8 to the sheet S. Further, an intermediate transfer belt cleaning device 12 is provided at a position facing the tension roller 10 via the intermediate transfer belt 8 to remove and collect transfer residual toner remaining on the surface of the intermediate transfer belt 8.

  The image forming apparatus includes a sheet feeding cassette 13 as a sheet S feeding unit and a manual sheet feeding unit 17. The manual paper feed unit 17 includes a manual paper feed tray 21 described later, is supported by the apparatus main body 1, and rotates in a direction such that the upper end separates from the apparatus main body with a horizontal axis (not shown) at the lower end It is configured to The manual sheet feeding unit 17 will be described in detail with reference to FIGS.

  The sheets S stacked on the predetermined number of sheets in the manual sheet feeding unit 17 are separated one by one by the sheet feeding belt 18 and the separating roller 19 and conveyed to the sheet feeding and extracting roller 16. Similarly, the CST sheet feeding roller 14 and the CST separating roller 15 separate the sheets, which have been stacked on the sheet feeding cassette 13 by a predetermined number, and convey the sheet to the sheet feeding and extracting roller 16 one by one. The sheet S conveyed by the sheet feeding and extracting roller 16 is conveyed to the pair of registration rollers 70 and conveyed to the contact portion between the intermediate transfer belt 8 and the secondary transfer roller 11. The toner image transferred to the intermediate transfer belt 8 from the image forming unit of each color is transferred to the sheet S from the contact portion of the intermediate transfer belt 8 and the secondary transfer roller 11 to form a color image, and then the sheet S is fixed It is transported to the container 71. The fixing device 71 applies heat and pressure to the toner image transferred to the sheet S. Thus, the sheet S on which the toner images of a plurality of colors are fixed is guided by the double-sided flapper 72 and guided to the discharge conveyance path 73 side, and is discharged to the discharge tray 75 through the discharge roller pair 74. The double-sided flapper 72 is a conveyance path switching unit that guides the sheet to the discharge conveyance path 73 when printing on one side.

(Manual feed unit 17)
2 to 9 are diagrams showing the configuration of the manual sheet feeding unit 17. As shown in FIG. FIG. 2 is a perspective view showing the details of the right door 20 including the manual sheet feeding unit 17. The right door 20 is an open / close door supported by the apparatus main body 1 and pivoted in the direction in which the upper end is separated from the right door 20 with a horizontal axis (not shown) on the lower end side as a pivot center. The right door 20 is provided on the right side as viewed from the front of the image forming apparatus, and connects the apparatus main body and the right door 20 by a connecting member (not shown). The manual feed tray 21 is a sheet stacking unit supported by the right door 20 and rotated about a horizontal axis at the lower end side as a rotational center. In the present embodiment, the angle of the manual feed tray 21 is displaced in conjunction with the rotation of the right door 20. As a result, the upper end side of the manual feed tray 21 is inclined to an angle at which the upper end side of the manual feed tray 21 is located below the rotation center, and there is a possibility that loaded unused sheets fall to the ground. Therefore, in the present embodiment, a wall member 23W described later is provided in the vicinity of the handle portion 23H to prevent the sheet bundle from dropping when the manual feed tray 21 is inclined.

  The manual feed tray 21 has a manual feed tray base 21 B, an extension tray 23, and a manual feed tray cover 27 which will be described later. The rotation stopper 26 is a rotation stopper for the manual feed tray 21, one end thereof is rotatably supported by the right door 20, and the other end is rotatably and slidably supported with respect to the manual feed tray 21. Thereby, the maximum opening angle of the manual feed tray 21 is determined. The side regulating plate 22 is provided on the manual feed tray 21 and has a width direction orthogonal to the feeding direction of the sheet S so that the sheet S stacked on the manual feed tray 21 can be fed straight to the image forming apparatus main body 1. Restrict the movement of both ends of the The side regulating plate 22 has the Hisashi portion 22H, and suppresses the curling of the end in the width direction of the sheet. The manual feed tray storage space 24 is a space between the right door 20 and the manual feed tray 21. Specifically, when the manual feed tray 21 is closed, the manual feed tray storage space 24 is a space surrounded by the manual feed tray 21 and the side regulation plate 22 provided on the manual feed tray 21 and the extension tray 23 and the like. is there. The sheet feeding belt unit 25 is a feeding unit including the sheet feeding belt 18, and is held by the right door 20. Further, when the manual feed tray 21 is closed with respect to the right door 20, the manual feed tray 21 is disposed so as to be invisible to the operator. The extension tray 23 has a wall member 23W that protrudes from the sheet stacking surface (or a virtual surface virtually extending the sheet stacking surface). When the manual feed tray 21 is shifted in angle in conjunction with the rotation of the right door 20 (when the upper end side of the manual feed tray 21 is positioned lower than the rotation center), the wall member 23 W is manually fed tray 21. Unused paper loaded on the machine is prevented from falling to the ground. The wall member 23W is provided at a position overlapping the handle portion 23H (FIG. 3) in the width direction when viewed from the sheet feeding direction. The grip portion 23H is a grip portion gripped by the operator when the manual feed tray 21 is released from the right door 20.

  FIG. 3 is a perspective view showing the extension tray 23 and the manual feed tray cover 27 in detail. When using a large size sheet such as an A3 sheet, the operator holds the handle portion 23H and pulls out the extension tray 23 for use. The extension tray 23 is stored in a box-shaped manual feed tray box whose opening for inserting and removing the extension tray 23 sandwiched between the manual feed tray base 21B and the manual feed tray cover 27 is open.

In the extension tray 23, the bosses 27P of the manual tray cover 27 are guided by the grooves 23M of the extension tray 23 on the left and right ends of the manual tray 21, and smoothly slide on the manual tray. As shown in FIG. 3, the wall member 23W sets the dimensions a, b, d to a = 15 mm, b = 60 mm, and the step d to 1 mm. The dimension a defining the height of the wall member is preferably set higher than the maximum height of sheets allowed to be stacked on the manual feed tray 21. Here, 10 mm set as the value of the dimension a corresponds to 100 sheets of paper having a basis weight of 64 g / m ² . Further, in the present embodiment, the operator can easily grasp the handle portion 23H by providing the step d on the upper end side of the wall member 23W.

  FIG. 4 is a perspective view showing the side on which the extension tray 23 of the manual feed tray base 21B is stored. The claw portion 23F of the extension tray 23 is fixed to the storage position and the withdrawal position by engaging the recess 21K of the manual feed tray base 21B. In the present embodiment, locking is performed in a two-step locking position. However, the locking position is not limited to this, and the number of recesses may be increased so that locking can be performed in three or more steps.

  FIG. 5 is a perspective view of the right door 20 with the manual feed tray 21 closed. The dimensions of the operation port 24T formed by the concave portion of the manual feed tray 21 were set to X = 70 mm (b + 10 mm), Y = 20 mm, and Z = 25 mm. By setting the above dimensions, the user can easily insert a hand into the operation port 24T when opening the manual feed tray 21 and open the manual feed tray 21. In the present embodiment, the recessed portion is formed in the manual feed tray 21, but may be formed in the right door 20 instead of the manual feed tray 21. The wall member 23W makes it easy for the operator to recognize the place and the shape when gripping the handle of the manual feed tray 21. Further, the wall member 23W is configured to conceal the manual feed tray storage space 24 from the opening, so that the operator's finger is not inserted to the far end.

  6 is a cross-sectional view taken along the line A-A shown in FIG. 5 and illustrates a method of locking the manual feed tray 21 with respect to the right door 20. As shown in FIG. In FIG. 6, the claw member 35 and the claw member urging spring 36 are provided on the right door 20 side, and the locking hole 21H is provided on the manual feed tray 21 side. When the manual feed tray 21 is rotated with respect to the right door 20, the edge of the locking hole 21H pushes up the claw member 35 biased by the claw member biasing spring 36 to release the lock.

  FIG. 7 is a cross-sectional view taken along the line B-B shown in FIG. 5 and illustrates a method of locking the right door 20 with respect to the image forming apparatus main body 1. The right door handle 31 pivots counterclockwise in the figure to release the lock. The claw member biasing spring 32 is set to have a larger spring force than the claw member biasing spring 36 of FIG. Because the right door 20 is heavier than the manual feed tray 21, the holding force by the lock must be increased.

  When the manual feed tray 21 is stored in the right door 20, a manual feed tray storage space 24 is formed by the inner wall 20C of the right door 20 and the exterior surface of the manual feed tray 21. In FIG. 7, the gap λ between the wall member 23W and the inner wall 20C of the right door 20 in the manual tray storage space 24 is set to 5 mm.

FIG. 8 is a cross-sectional view showing a state in which the right door 20 is closed and a sheet bundle is stacked. In this embodiment, the maximum height Hs of the sheet bundle is set to 10 mm, and the height Hw of the t surface of the wall member 23W is set to 15 mm. The allowable height of 10 mm of the bundle of paper is an amount corresponding to 100 sheets of paper having a basis weight of 64 g / m ² . The downstream end of the bundle of sheets abuts against a pre-feed guide (not shown), and the position in the sheet width direction is regulated by the side regulating plate 22 in the width direction, and the sheet bundle is in a state of waiting for sheet feeding operation.

  FIG. 9 is a cross-sectional view showing a state in which the right door 20 is opened for the jam processing operation while an unused sheet bundle is stacked on the manual feed tray. The upstream end of the sheet bundle abuts against the wall member 23W of the extension tray 23 to prevent the sheet bundle from falling to the ground. The paper bundle tends to fall as the value of θ shown in FIG. 9 approaches 0 °, but in a usual apparatus, it does not become so small due to the relationship between the fulcrum and the center of gravity. In addition, by providing the Hisashi portion 22H provided on the side regulating plate 22, lifting of the sheet bundle is suppressed, and it is difficult for the sheet bundle to get over the wall member 23W.

  In the present embodiment, the apparatus main body is installed on the dedicated loading stand 101, and as shown in FIG. 9, the manual feed tray is shown as fully opened with respect to the right door 20. However, when the image forming apparatus is placed on the floor, the upstream end of the manual feed tray remains in contact with the floor, and the inclination angle is smaller than in the present embodiment.

  The structure of the manual feed tray 21 provided in the image forming apparatus of the present embodiment has been described above. In the manual feed tray 21 of this embodiment, the angle of the manual feed tray 21 is displaced in conjunction with the rotation of the right door 20 supported by the apparatus main body 1, and the upper end of the manual feed tray is lower than horizontal with respect to the rotation fulcrum. Tilt to the angle located at. At this time, the wall member 23W provided on the extension tray 23 abuts on the rear end of the sheet on the manual feed tray 21 to prevent the sheet from falling. This makes it possible to open the right door 20 without removing unused paper on the manual feed tray when jamming.

  Further, the wall member 23W has an application for shielding the manual feed tray storage space 24 as well as the application for the paper fall prevention described above. That is, when the wall member 23W is located near (or forms part of) the handle portion 23H, when the manual feed tray 21 is changed from the closed state to the open state, the operator stores the finger in the tray. The insertion into the space 24 is prevented.

  In addition, the wall member 23W may be used to make it easy for the operator to recognize the place and the shape when gripping the handle portion of the manual feed tray 21. From the operator's point of view, it may feel psychologically uneasy if it is difficult to see the lower back through the opening of the manual feed tray. To alleviate such anxiety, a wall member 23W is provided to grip the handle 23H. It makes it easy to recognize the place and shape of the event.

  Further, since the wall member 23W urges the operator to grasp the elevation, there is also an effect that it can be formed in a handle shape so as not to pinch a finger when closing the manual feed tray 21.

  Further, since the wall member 23W also serves as a handle for opening the manual feed tray 21, there is an effect that it is not necessary to additionally provide a dedicated part.

DESCRIPTION OF SYMBOLS 1 image forming apparatus 13 sheet feeding cassette 17 manual sheet feeding unit 18 sheet feeding belt 19 separation roller 20 right door 20C right door inner wall 21 manual tray 22 B manual tray base 21 H locking hole 21 K recessed portion 22 side regulating plate 22 H tine portion 23 extension tray 23f Tab portion 23H Handle portion 23M Groove portion 23W Wall member 24 Manual feed tray storage space 24T Operation port 25 Sheet feeding belt unit 26 Rotation stopper 27 Manual feed tray cover 27P Boss 31 Right door grip 33 Locking member 35 Tabging member

Claims (7)

The device body,
A door supported by the device body and pivoted at the upper end side about a lower end side shaft;
A manual feed tray for loading sheets, which is supported by the door and configured such that the upper end side is pivoted about a lower end side shaft;
A feeding unit configured to feed sheets stacked on the manual feed tray;
An image forming unit that forms an image on a sheet fed by the feeding unit;
A handle portion provided on the manual feed tray and gripped by an operator when the manual feed tray is rotated in a direction away from the door;
And a wall member provided at a position overlapping the handle in a direction orthogonal to the sheet feeding direction,
The wall member is loaded on the manual feed tray when the angle of the manual feed tray is displaced in conjunction with the rotation of the door and the upper end of the manual feed tray is inclined to an angle positioned below the rotation center. An image forming apparatus characterized in that the falling of the sheet is prevented by hitting the sheet. When the manual feed tray is in a closed state, a space is formed between the manual feed tray and the door,
The image forming apparatus according to claim 1, wherein the wall member is configured to shield the space from an opening of the manual feed tray.   The image forming apparatus according to claim 1, wherein a step is provided on the upper end side of the wall member in the manual feed tray. The manual feed tray has an extension tray which can slide in the sheet feeding direction,
The image forming apparatus according to any one of claims 1 to 3, wherein the handle portion and the wall member are provided on the extension tray. A conveyance path for conveying a sheet fed by the feeding unit to the image forming unit;
The image forming apparatus according to any one of claims 1 to 4, wherein the conveyance path is exposed by opening the door.   The image forming apparatus according to any one of claims 1 to 5, wherein the wall portion protrudes from a virtual surface of a loading surface of the manual feed tray.   The image forming apparatus according to claim 6, wherein a height of the wall member from the loading surface is higher than a maximum height of a sheet bundle allowed to be loaded on the manual feed tray.

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