JP2004155551A - Paper delivery device/image forming apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To load paper sheets on a paper discharge base in order by a simple configuration. <P>SOLUTION: An inlet guide member 55 having a guide face 55a inclined in such a way that it is substantially vertical for a loading face of the paper discharge base 52 and the upstream side in the direction of discharge is close to the inside of side fences 201a, 201b is detachably provided in end parts on the upstream side in the direction of discharge of the side fences 201a, 201b. The guide face 55a has an upper end fringe which becomes an upgrade toward the direction of discharge. The discharged printing paper sheet S is held in a U-shaped curve shape by an upper end fringe of the guide face 55a and collides against an end fence 203 while it is. The printing paper sheet S attempts to return in the reverse direction after collision, but rear end corner parts Sa, Sb are abutted on the guide face 55a to limit its travel. Consequently, the printing paper sheets drop without causing disorder and are loaded on the paper discharge base 52 in order. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an image forming apparatus such as a stencil printing apparatus and a copying machine, and a paper discharge device used for the image forming apparatus.
[0002]
[Prior art]
Generally, this type of paper discharge device is mounted in a protruding state outside the side surface of the image forming apparatus main body, and flies an image-formed sheet (sheet-shaped recording medium) discharged by a paper discharge conveyance unit of the apparatus main body. In this case, a so-called shoot delivery method is adopted in which the sheet is dropped on a sheet discharge table and stacked.
In order to regulate the position of the leading end of the sheet in the discharging direction, an end fence with which the leading end of the sheet abuts is provided downstream of the sheet discharging table in the discharging direction. In addition, a pair of side fences are provided on the sheet discharge tray in order to regulate both positions (left and right positions) in the sheet discharge direction.
Such a shoot delivery method has a disadvantage that the flying state of the sheet is easily disturbed, and the transport position (discharge position) and the transport direction (discharge direction) are not constant. The reason is that the leading end of the sheet is easily turned by the resistance of air, and once the shape of the leading end in the flight direction is broken, the sheet is strongly subjected to the resistance of air and loses the flying energy.
[0003]
For this reason, the cross-sectional shape perpendicular to the transport direction (discharge direction) at the time of paper flying is held in a U-shaped curve, and the apparent rigidity in the transport direction is increased, that is, the flying shape is maintained by corrugating. There have been many attempts to improve the consistency of the transfer position and the transfer direction.
For example, Japanese Patent Application Laid-Open No. 6-239001 describes a configuration in which inclined surfaces are provided on both sides of a suction conveyance unit so that the downstream side in the conveyance direction is high, and a paper is curved in a U-shape when discharged from the apparatus main body. In Japanese Patent Publication No. 8-29878 and Utility Model No. 2551875, an elastic guide member made of a wire-like material is provided near the entrance of the paper discharge tray, and the paper is formed into a U-shaped curved shape at the entrance of the paper discharge tray. Is described.
According to such a configuration, the paper can be stiffened in the transport direction, and the flying of the paper until the paper abuts on the end fence can be stabilized. That is, the flying energy up to the end fence can be maintained.
[0004]
However, in the configuration described above, after the flying paper collides with the end fence, it is not possible to prevent the paper from bouncing in the direction opposite to the transport direction due to the reaction force.
In order to prevent rebound, the flying energy of the paper is absorbed at the moment when the leading edge of the paper abuts against the end fence. It is necessary to drop vertically.
In JP-A-9-100057 and JP-A-11-189364, a swinging fence is provided at the entrance side of the sheet discharge table so that the upper end thereof is rotatably supported. It describes a configuration for dropping while absorbing.
[0005]
[Patent Document 1]
JP-A-58-46428
[Patent Document 2]
Japanese Utility Model Publication No. 7-43085
[Patent Document 3]
Japanese Patent Publication No. 8-29878
[Patent Document 4]
Japanese Patent No. 2551875
[Patent Document 5]
Utility Model No. 25552464
[Patent Document 6]
JP-A-6-239001
[Patent Document 7]
JP-A-9-100057
[Patent Document 8]
JP-A-9-194113
[Patent Document 9]
JP-A-11-189364
[0006]
[Problems to be solved by the invention]
With the configurations described in JP-A-9-100057 and JP-A-11-189364, it is possible to prevent the paper from rebounding, but the swinging configuration is complicated and the increase in manufacturing cost cannot be avoided.
Also, in the case of a paper such as a thick paper, which originally has a strong stiffness, it is difficult to impart a U-shaped curved shape, and its weight is heavy, so that it does not easily rebound even if it collides with an end fence. The guide member only exerts a load on paper conveyance, and conversely causes a paper discharge jam.
Even if the paper ejection guide member is simply formed of a wire-like elastic body as described above, it is not possible to expect that the wire member is deformed and the paper load is reduced in consideration of the rigidity of both members, and that the paper ejection jam is reduced. There was virtually no change in the factors.
[0007]
The present invention provides a paper ejection device that can prevent the paper from rebounding from an end fence with a simple configuration and can stack sheets neatly on a paper ejection table, or can prevent loss of flying energy until the paper comes into contact with the end fence. An object of the present invention is to provide an image forming apparatus provided with the above.
Another object of the present invention is to provide a paper discharge device capable of reducing manufacturing costs and an image forming apparatus provided with the same.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, according to the first aspect of the present invention, a sheet discharge table on which a sheet-shaped recording medium to be discharged is stacked is disposed, and the sheet-type recording medium is disposed downstream of the sheet-type recording medium in the discharge direction. In a sheet discharging device having an end fence with which the leading end of the sheet-shaped recording medium abuts and a pair of side fences arranged on both sides of the sheet discharging table in a direction of discharging the sheet-shaped recording medium, the discharge direction of each of the side fences An entrance guide member provided at an upstream end and having a guide surface that is substantially perpendicular to the stacking surface of the paper discharge tray and that is inclined so that the upstream side in the discharge direction is closer to the inside of the side fence; The sheet-shaped recording medium is dropped while the movement of the corner at the rear end of the sheet-shaped recording medium in the discharge direction is restricted by the guide surface.
[0009]
According to a second aspect of the present invention, in the paper discharge device according to the first aspect, a configuration is adopted in which the guide surface of each of the entrance guide members has an upper edge that is inclined upward in the discharge direction. I have.
[0010]
According to a third aspect of the present invention, in the paper discharge device according to the first or second aspect, when the sheet-shaped recording medium reaches the end fence, the guide surface of the entrance guide member is close to the corner without any gap. It is configured to be provided to
[0011]
According to a fourth aspect of the present invention, in the paper discharge device according to any one of the first to third aspects, the entrance guide member is detachably provided to the side fence. I am taking it.
[0012]
According to a fifth aspect of the present invention, in the paper discharge device of the fourth aspect, the entrance guide member is attached and detached only by an operation of snap-fit by elastic deformation of the entrance guide member and release thereof. ing.
[0013]
According to a sixth aspect of the present invention, in the paper ejection device according to any one of the first to third aspects, the entrance guide member is rotatably provided on the side fence, and the entrance guide member is rotatable. A configuration is adopted in which the guide surface can be retracted to a position that does not hinder the discharge according to the type.
[0014]
According to a seventh aspect of the present invention, in the paper discharge device according to the sixth aspect, the entrance guide member is fixed to the side fence at a predetermined position for guiding the discharge by snap fit due to its elastic deformation. I am taking it.
[0015]
According to an eighth aspect of the present invention, in the paper discharge device of the sixth or seventh aspect, the entrance guide member and the side fence are detachably provided, and the rotation shaft portion is formed only by one-touch engagement operation with each other. It has a configuration of having a structure to be formed.
[0016]
According to a ninth aspect of the present invention, in the paper discharge device of the fourth, fifth or eighth aspect, the entrance guide member has a shape that can be shared with the pair of side fences. ing.
[0017]
According to a tenth aspect of the present invention, in the paper discharge device according to any one of the first to third aspects, the entrance guide member is formed integrally with the side fence.
[0018]
According to an eleventh aspect of the present invention, in the image forming apparatus having a sheet discharging device for discharging and stacking a sheet-shaped recording medium on which an image is formed, the sheet discharging device is any one of the first to tenth aspects. It is a configuration that it is.
[0019]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
First, an outline of the configuration and operation of a stencil printing apparatus as an image forming apparatus will be described with reference to FIG. The stencil printing apparatus 1 mainly includes a printing unit 20, a stencil making unit 10, a paper feeding unit 5, a stencil discharging unit 30, and a paper discharging unit 410. A paper discharging device 520 is attached to a left side surface of the apparatus main body. I have.
At the time of plate making, the used master wound around the plate cylinder 2 provided in the printing unit 20 is peeled and collected by the plate discharging unit 30, and based on the image data read by the image reading unit 100, the plate making unit 10 is used. The master 11 is made a plate and wound around the outer peripheral surface of the plate cylinder 2.
[0020]
At the time of printing, a printing sheet S as a sheet-like recording medium is synchronously fed from the paper feed unit 5 to the rotationally driven plate cylinder 2, and the printing sheet S is pressed against the plate cylinder 2 by the press roller 4. . By the pressing operation of the press roller 4, the ink is transferred to the printing paper S via the master on the plate cylinder 2.
The printed (image-formed) printing paper S to which the ink has been transferred is conveyed while being attracted to the conveyor belt 44 by the suction force of the suction fan 46 in the paper discharging unit 410, and is discharged to the paper discharging device 520. On both sides of the transport belt 44, inclined plates 45 for giving a U-shaped curved shape to the printing paper S are provided.
The discharge device 520 includes a discharge tray 52, an end fence 203 disposed downstream of the discharge tray 52 in the discharge direction of the print sheet S, and an end of the print sheet S in contact with the discharge tray 52, and a print sheet on the discharge tray 52. It has a pair of side fences 201a and 201b arranged on both sides in the S discharge direction.
[0021]
As shown in FIG. 2, the side fence 201 b is integrally formed of a synthetic resin in a box shape with a hollow outside, and a plurality of vertically long through holes 201 b-1 are formed at intervals in the discharge direction of the printing paper S. ing. These through-holes 201b-1 have a function of releasing air when the printing paper S falls to the outside, and also contribute to the weight reduction of the side fence 201b. Inside the lower end of the side fence 201b, an inclined surface 201b-2 for holding the printing paper S loaded on the loading surface of the paper discharge tray 52 in a downwardly convex U-shape is formed.
At the center of the lower end of the side fence 201b, a slider 54 that moves on a rail 53 extending in a direction perpendicular to the discharge direction of the printing paper S is fixed. The side fence 201a also has the same configuration, and the corresponding reference numerals are assigned and the description is omitted.
Thus, the position of the side fences 201a and 201b can be adjusted according to the size of the printing paper S. The end fence 203 also has a similar position adjustment configuration in the discharge direction.
[0022]
An entrance guide member 55 is provided at each end of the side fences 201a and 201b on the upstream side in the discharge direction.
As shown in FIG. 3, the entrance guide member 55 in the present embodiment is formed of a sheet metal member, and is substantially perpendicular to the stacking surface of the paper discharge tray 52 and the upstream side in the discharge direction approaches the inside of the side fence 201 a. Guide body 55a, a flat engaging body portion 55b for the side fence 201a, and a positioning piece 55c which is bent substantially vertically from the engaging body portion 55b and is engaged with the upper end of the side fence 201a. A side engaging piece 55d having a U-shaped cross section engaged so as to embrace the inner side surface of the through hole 201a-1 of the side fence 201a, and a spacing holding piece 55e corresponding to the hollow shape of the side fence 201a; 55f and an elastic engaging portion 55g formed by punching out a boundary portion between the guide surface 55a and the engaging main body portion 55b and bending in an L-shape.
[0023]
The entrance guide member 55 is formed so as to be substantially symmetric with respect to the center line L, and the guide surface 55a forms an isosceles triangle. That is, the entrance guide member 55 can be used for both the left and right side fences 201a and 201b (can be shared).
The engaging body 55b is a surface that is substantially parallel to the side fences 201a and 201b, and the guide surface 55a is inward from the engaging body 55b such that the tip end thereof is inward of the side fences 201a and 201b. Bent. The guide surface 55a has an upper edge (ridge line) 55a-1 that is inclined upward in the discharge direction of the printing paper S.
[0024]
Attachment of the entrance guide member 55 to the side fence 201a is performed by engaging the positioning piece 55c and the side engaging piece 55d with the elastic engaging portion 55g at the upstream vertical edge of the side fence 201a in the discharge direction of the printing paper S. Snap-fit by pressing in such a way that it is pressed and completed. That is, it can be easily attached by one-touch operation without using any members such as screws. Of course, it is also easy to remove it only by pulling it out.
Although the case where the entrance guide member 55 is attached to the side fence 201a has been described above, when the same entrance guide member 55 is attached to the opposite side fence 201b, the entrance guide member 55 may be inverted and similarly attached. .
In this case, the spacing piece 55f for the side fence 201a serves as a positioning piece for the side fence 201b, and the positioning piece 55c serves as a spacing piece. In addition, when the print sheet S is attached to the side fence 201b, the ridge line 55a-2 on the opposite side of the guide surface 55a becomes the upper edge for guiding the printing paper S.
[0025]
Next, the paper discharging / stacking function of the printing paper S by the paper discharging device 520 will be described with reference to FIG. The printed printing paper S having a U-shaped curve attached by the inclined plate 45 in the paper discharge unit 410 of the stencil printing apparatus 1 is transported by the transport belt 44 to the pair of side fences 201 a and 201 b and the end fence 203. The paper is discharged to the enclosed rectangular space of the paper discharge table 52.
Marks for positioning the side fences 201a and 201b and the end fence 203 in accordance with each sheet size are provided on the stacking surface of the paper discharge tray 52, and the side fences 201a and 201b and the end fence are set in accordance with the marks. When the front end of the printing paper S comes into contact with the end fence 203, the corners Sa and Sb at the rear end in the discharge direction of the printing paper S are close to the guide surface 55a of the entrance guide member 55 when the front end of the printing paper S comes into contact with the end fence 203. The angle θ of the guide surface 55a in the horizontal plane is set so as to be positioned.
[0026]
The interval between the side fences 201a and 201b is set to be appropriately smaller than the entire width of each sheet, so that the printing sheet S is stacked on the sheet ejection table 52 in a U-shape. It has become.
When the printing paper S discharged from the paper discharging unit 410 of the stencil printing apparatus 1 while being sewn in a U-shaped curved shape reaches the paper discharging table 52, the upper end edge 55a of the guide surface 55a of the entrance guide member 55- 1, 55a-2 starts to be contacted from the tip. Since the both sides of the back surface of the paper are supported by the upper edges 55a-1, 55a-2 which are inclined upward in the paper discharging direction, the printing paper S keeps a downwardly convex U-shape, and the leading end is downward. Fly without hanging down.
[0027]
Even after the leading end of the printing paper S has separated from the guide surface 55a of the entrance guide member 55, the rear of the printing paper S keeps the U-shape by the upper edges 55a-1, 55a-2 of the guide surface 55a. In combination with the fact that the interval between the pair of side fences 201a and 201b is set slightly smaller than the entire width of the sheet, the U-shaped shape is maintained until the leading end of the printing sheet S reaches the end fence 203. Thus, the flying state of the printing paper S is always stable without being disturbed.
When the leading end of the printing paper S collides with the end fence 203, the printing paper S starts to move in a direction opposite to the discharge direction due to the reaction force, but the guide surface of the entrance guide member 55 is located near the rear end of the printing paper S. Since the sheet 55a is located, the rear end of the sheet S immediately contacts the guide surface 55a, and the sheet S is prevented from rebounding.
The flying energy of the printing paper S is lost due to the collision of the front and rear ends of the paper with the end fence 203 and the guide surface 55a or the repetition of the collision, and then falls down substantially vertically between the side fences 201a and 201b by its own weight. Go. Therefore, the printing sheets S on the sheet discharge table 52 are stacked neatly without being disturbed in the front-rear and left-right directions.
[0028]
Since the guide surface 55a of the entrance guide member 55 is formed of a flat plate and has a continuous surface, the printing paper S is subjected to the bounce-restricting action of the guide surface 55a throughout the substantially vertical falling process. .
The surface property of the guide surface 55a is not necessarily limited to a series of surfaces, but may be a mesh shape or the like as long as the above-described rebound limiting action can be maintained in the process of dropping the printing paper S. Further, the entrance guide member 55 is formed of a sheet metal member, but may be formed of a synthetic resin or the like.
[0029]
When the printing paper S having high rigidity such as thick paper is used, as described above, even if an attempt is made to force the user to stiffen by the entrance guide member 55, the stiffness is difficult to be made, and the paper discharge load increases. Only this may cause paper ejection jam. For this reason, the entrance guide member 55 is removed from the side fences 201a and 201b when the cardboard is passed.
In the present embodiment, the positions of the side fences 201a and 201b and the end fence 203 are adjusted by manual operation, but may be automatically adjusted based on the size information of the printing paper S.
In this case, with respect to the side fences 201a and 201b, the sliders 54 and 54 are synchronously moved by a moving mechanism (not shown) provided on the lower surface side of the sheet discharge tray 52. The moving mechanism can adopt a well-known configuration having, for example, a stepping motor, a pinion fixed to a rotating shaft thereof, and a pair of racks meshing with the pinion, and according to the size of the printing paper S by controlling the stepping motor by control means (not shown). The position is adjusted automatically.
[0030]
In the above-described embodiment, the entrance guide member 55 is configured to be attached to and detached from the side fences 201a and 201b. However, depending on the type of business, region, or country, there is a market in which only thin paper is used and a reduction in device cost is required. .
In such a case, it is not necessary to remove the entrance guide member 55 when using the thick paper, so that the advantage of the detachable configuration is not obtained and the production cost is increased. Therefore, the entrance guide member 55 (strictly speaking, the guide surface 55a) is used. ) May be integrally formed with the side fences 201a and 201b (second embodiment).
[0031]
Next, a third embodiment will be described with reference to FIG. The same parts as those in the first embodiment are denoted by the same reference numerals, and the description of the already-described configuration and functions will be omitted and only the main parts will be described unless otherwise required (the same applies to other embodiments described below). The present embodiment aims to reduce the trouble of removing the entrance guide member 55 when using thick paper.
In the entrance guide member 55A in the present embodiment, the rotation shaft 55h is provided integrally with the engagement main body 55b, and the engagement for engaging the rotation shaft 55h with the side fence 201b is correspondingly performed. Holes 201b-3 and 201b-4 are formed. The engaging hole 201b-3 is formed at the upper end of the side fence 201b, and the engaging hole 201b-4 is formed in a horizontal convex piece 201b-5 integrally formed on the outer surface of the side fence 201b.
[0032]
First, after the upper end of the rotating shaft 55h is inserted into the engagement hole 201b-3, it is lowered and the lower end is inserted into the engagement hole 201b-4, and positioning is performed by locking the lower end. When the guide surface 55a is rotated in the direction of the arrow A (inward) in this locked state, the elastic engagement portion 55g presses against the vertical edge of the side fence 201b on the upstream side in the discharge direction, snap-fits, and is fixed in position.
When using thick paper, the guide surface 55a is pushed in the direction of arrow B (outward) to release the fitted state of the elastic engagement portion 55g, and the position indicated by the two-dot chain line (does not interfere with the discharge of the printing paper S). Position). The same applies to the side fence 201a. Also in the present embodiment, as in the first embodiment, the entrance guide member 55A can be easily attached and detached by a one-touch operation, and assembling is easier than in the case where the entrance guide member 55A is fixed with screws or the like.
According to the present embodiment, it is not necessary to separate the entrance guide member 55A from the side fences 201a and 201b, so that there is an advantage that a storage space after removal and a troublesome part management are not required.
[0033]
As shown in FIG. 6, a pair of receiving portions 201b-5 whose openings are expanded by elastic deformation are formed on the outer surface of the side fence 201b in a vertical direction, and the rotating shaft 55h is pushed into the receiving portion 201b-5 to support it. May be configured (fourth embodiment). The same configuration is used on the side fence 201a side.
A shaft may be formed on the side fence 201a, 201b side, and a receiving portion that snap-fits to the shaft may be formed on the engaging body 55b of the entrance guide member 55A. Further, the rotation configuration of the entrance guide member 55A is not limited to the above-described pivot type, but may be a configuration in which the rotation shaft is supported by a hinge.
[0034]
【The invention's effect】
According to the first or eleventh aspect of the present invention, the sheet-shaped recording medium to be discharged is stacked, and the sheet-shaped recording medium is disposed on the sheet-discharging table at a position downstream of the sheet-shaped recording medium in the discharging direction. In a sheet discharging device having an end fence with which the leading end of a medium abuts and a pair of side fences arranged on both sides of the sheet discharge medium in the sheet discharging direction, an upstream end of each of the side fences in a discharging direction. And a guide surface substantially perpendicular to the stacking surface of the paper discharge tray and having a guide surface that is inclined so that the upstream side in the discharge direction is closer to the inside of the side fence, and the guide surface of the entrance guide member. As a result, the sheet-shaped recording medium is dropped while restricting the movement of the corner at the rear end in the discharge direction of the sheet-shaped recording medium, so that rebound of the sheet-shaped recording medium is prevented. Can be, it can be neatly stacked on the paper discharge tray on.
[0035]
According to the second or eleventh aspect of the present invention, in the paper discharge device according to the first aspect, the guide surface of each of the entrance guide members has an upper edge that is inclined upward in a discharge direction. Therefore, the flying state of the sheet-shaped recording medium can be maintained without being disturbed until the leading end of the sheet-shaped recording medium hits the end fence.
[0036]
According to the third or eleventh aspect of the present invention, in the paper discharge device according to the first or second aspect, the guide surface of the entrance guide member is formed at the corner portion when the sheet-shaped recording medium reaches the end fence. Are provided so as to be close to each other without a gap, so that the rebound of the sheet-shaped recording medium can be prevented with high accuracy, and the orderlyness on the sheet discharge table can be further improved.
[0037]
According to the fourth or eleventh aspect of the invention, in the paper discharge device according to any one of the first to third aspects, the entrance guide member is detachably provided to the side fence. With this configuration, it can be removed when it is not necessary, such as when using thick paper, and the occurrence of paper jam due to unnecessary discharge load can be prevented.
[0038]
According to the fifth or eleventh aspect of the present invention, in the paper discharge device according to the fourth aspect, the mounting and dismounting of the entrance guide member is performed only by an operation of snap-fit by elastic deformation of the entrance guide member and a release thereof. Therefore, the easiness of the attaching / detaching operation can be improved.
[0039]
According to the invention as set forth in claim 6 or 11, in the sheet discharging apparatus according to any one of claims 1 to 3, the entrance guide member is rotatably provided on the side fence, and the sheet The guide surface can be retracted to a position where it does not hinder the ejection according to the type of the recording medium. Can be achieved.
[0040]
According to the seventh or eleventh aspect of the present invention, in the paper discharge device according to the sixth aspect, the entrance guide member is fixed to the side fence at a predetermined position for guiding the discharge by snap fit due to its elastic deformation. With the configuration, the handling and usability can be further improved.
[0041]
According to the eighth or eleventh aspect of the present invention, in the paper discharge device according to the sixth or seventh aspect, the entrance guide member and the side fence are provided detachably, and can be rotated only by one-touch engagement operation with each other. Since the configuration has a structure in which the driving shaft portion is formed, it is possible to facilitate the assembly in the manufacturing process.
[0042]
According to the ninth or eleventh aspect of the present invention, in the paper discharge device according to the fourth, fifth or eighth aspect, the entrance guide member has a shape that can be shared by the pair of side fences. Therefore, the manufacturing cost can be reduced by unifying the mold and the like.
[0043]
According to the tenth or eleventh aspect of the present invention, in the paper discharge device according to any one of the first to third aspects, the entrance guide member is formed integrally with the side fence. According to the usage of the user, the entrance guide member and the side fence can be integrally formed by molding, injection molding or the like to reduce the number of parts, thereby reducing the manufacturing cost.
[Brief description of the drawings]
FIG. 1 is a schematic front view of a stencil printing apparatus as an image forming apparatus according to a first embodiment of the present invention.
FIG. 2 is a schematic perspective view of a paper discharge device.
FIG. 3 is a perspective view seen from the inside of an entrance guide member.
FIGS. 4A and 4B are diagrams showing a print sheet discharge state in a paper discharge device, wherein FIG. 4A is a schematic plan view and FIG. 4B is a schematic side view.
FIG. 5 is a perspective view of a main part showing an attached state of an entrance guide member according to a third embodiment.
FIG. 6 is a perspective view of a main part showing a configuration of a rotating shaft according to a fourth embodiment.
[Explanation of symbols]
52 Paper Output Stand
55 Entrance guide member
55a Guide surface
55a-1, 55a-2 Upper edge
201a, 201b Side fence
203 End fence
S Printing paper as sheet recording medium
Sa, Sb corner

Claims (11)

A discharge tray on which the discharged sheet-shaped recording medium is stacked, an end fence arranged downstream of the sheet-shaped recording medium in the discharge direction of the sheet-shaped recording medium, and a leading end of the sheet-shaped recording medium abutting; In a paper ejection device having a pair of side fences arranged on both sides in the ejection direction of the sheet-shaped recording medium on a paper board,
An entrance guide member provided at an upstream end of each of the side fences in the discharge direction, and having a guide surface substantially perpendicular to the stacking surface of the paper discharge tray and having an upstream side in the discharge direction inclined toward the inside of the side fence; A sheet discharge device for dropping the sheet-shaped recording medium while restricting the movement of the rear end corner of the sheet-shaped recording medium in the discharge direction by the guide surface of the entrance guide member. The paper discharging device according to claim 1,
A paper discharge device, wherein the guide surface of each of the entrance guide members has an upper edge that is inclined upward in a discharge direction. 3. The paper discharge device according to claim 1, wherein
A paper ejection device, wherein the guide surface of the entrance guide member is provided such that the corners are close to each other without a gap when the sheet-shaped recording medium reaches the end fence. The sheet discharging device according to any one of claims 1 to 3,
The paper ejection device, wherein the entrance guide member is detachably provided to the side fence. The paper ejection device according to claim 4,
A paper discharge device wherein the entrance guide member is attached and detached only by an operation of snap-fitting and release of the entrance guide member by elastic deformation. The sheet discharging device according to any one of claims 1 to 3,
The entrance guide member is rotatably provided on the side fence, and the guide surface can be retracted to a position that does not hinder ejection according to the type of the sheet-shaped recording medium. Paper equipment. The paper ejection device according to claim 6,
The paper discharge device, wherein the entrance guide member is fixed to the side fence at a predetermined position for guiding the discharge by snap fit due to its elastic deformation. The paper discharging device according to claim 6, wherein
A paper discharge device, wherein the entrance guide member and the side fence are detachably provided, and have a structure in which a rotating shaft portion is formed only by one-touch engagement operation with each other. The paper discharge device according to claim 4, 5 or 8,
The paper ejection device, wherein the entrance guide member has a shape that can be shared by the pair of side fences. The sheet discharging device according to any one of claims 1 to 3,
A paper discharge device, wherein the entrance guide member is formed integrally with the side fence. An image forming apparatus having a sheet discharging device for discharging and stacking an image-formed sheet-shaped recording medium,
11. The image forming apparatus according to claim 1, wherein the sheet discharging device is the one according to any one of claims 1 to 10.

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