JP2015036331A - Paper ejection device, paper processing device, and image formation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stabilize the posture of paper when the paper is ejected.SOLUTION: A paper ejection device includes: an ejection part 180 which ejects paper; a loading part 190 where the paper ejected from the ejection part 180 is loaded; a first ventilation device 201 which blows air W1 to the upper surface side of the paper when the paper is ejected from the ejection part 180; a second ventilation device 202 which blows air W2 to the lower surface side of the paper when the paper is ejected from the ejection part 180; and a control unit which controls operations of the first ventilation device 201 and the second ventilation device 202.

Description

  The present invention relates to a paper discharge device, a paper processing device, and an image forming apparatus.

2. Description of the Related Art Conventionally, an image forming system in which a sheet processing apparatus that performs various sheet processing is connected to an image forming apparatus such as an MFP (Multi Function Peripherals), a copying machine, or a printer is known.
In an image forming system, a paper discharge tray provided so as to protrude to the outside is provided, and sheets conveyed through the inside of the apparatus are generally discharged onto the paper discharge tray and sequentially stacked. .
As a technique for improving stackability when discharging paper onto a paper discharge tray, for example, Patent Document 1 includes a blower device below a paper discharge port for discharging paper to a paper discharge tray. A configuration is described in which upward wind is generated on the lower surface side of the discharged paper.

Japanese Patent Laid-Open No. 7-277583

  However, in the technique described in Patent Document 1, the posture at the time of ejection is not stable depending on the paper such as curled paper or paper with weak stiffness, and a problem may occur at the time of stacking. For example, as shown in FIG. 6, in the case of paper with weak stiffness, when discharging onto the paper discharge tray T <b> 1, the leading edge of the paper S in the discharge direction may be rounded due to air resistance.

  An object of the present invention is to provide a paper discharge device, a paper processing device, and an image forming apparatus that can stabilize the posture at the time of paper discharge.

To solve the above problem,
The invention according to claim 1 is a paper discharge device,
A discharge section for discharging paper;
A stacking unit for stacking sheets discharged from the discharging unit;
First blowing means for blowing a first wind toward the upper surface of the paper when the paper is discharged from the discharge section;
Second air blowing means for blowing a second wind toward the lower surface of the paper when the paper is discharged from the discharge portion;
A control unit for controlling the operation of the first blower and the second blower;
It is provided with.

According to a second aspect of the present invention, in the paper discharge device of the first aspect,
The second blowing means blows the second wind from a direction forming a predetermined angle with respect to the stacking unit,
The first air blowing means blows the first wind in a direction parallel to the stacking unit or in an angle that is less than the predetermined angle with respect to the stacking unit.

According to a third aspect of the present invention, in the paper discharge device of the second aspect,
The control unit includes a first air blowing unit and a second air blowing unit so that the wind pressure (P1) of the first wind and the wind pressure (P2) of the second wind satisfy a relationship of the following expressions (1) and (2). Controlling the air blowing means.
P1> P0 (P0: air resistance that the sheet receives during discharge) (1)
P2> P1 (2)

According to a fourth aspect of the present invention, in the paper discharge device according to the third aspect,
The control unit changes and adjusts the wind pressure (P1) of the first wind and the wind pressure (P2) of the second wind according to the thickness or basis weight of the paper.

According to a fifth aspect of the present invention, in the paper discharge device of the first aspect,
The control unit stops blowing air from the first blowing unit according to the type of paper or image forming conditions.

According to a sixth aspect of the present invention, in the paper processing apparatus,
Connected to an image forming apparatus having an image forming unit for forming an image on paper;
The paper discharge device according to claim 1, wherein the paper discharge device discharges the paper discharged from the image forming apparatus.

According to a seventh aspect of the present invention, in the image forming apparatus,
An image forming unit for forming an image on paper;
The paper discharge device according to any one of claims 1 to 5, wherein the paper on which the image is formed by the image forming unit is discharged.
It is provided with.

  According to the present invention, it is possible to stabilize the posture when paper is discharged.

1 is a diagram illustrating a configuration of an image forming system according to an embodiment of the present invention. 1 is a block diagram illustrating a functional configuration of an image forming system. It is a schematic diagram which shows a discharge part, a loading part, and a ventilation mechanism. It is a figure for demonstrating the effect | action by ventilation. FIG. 3 is a diagram illustrating a configuration when a paper discharge device is provided in an image forming apparatus. It is a figure for demonstrating the conventional problem.

  Embodiments of the present invention will be described below with reference to the drawings. However, the scope of the invention is not limited to the illustrated examples.

First, the configuration of the image forming system A will be described.
FIG. 1 is a cross-sectional view illustrating a schematic configuration of the image forming system A. FIG. 2 is a block diagram showing a functional configuration of the image forming system A.
As shown in FIGS. 1 and 2, the image forming system A includes an image forming apparatus B that forms an image on a sheet S, and a sheet processing apparatus C that performs predetermined sheet processing on the sheet S on which an image is formed. Have.

  The image forming apparatus B and the paper processing apparatus C are configured such that the paper discharge roller 76 and the paper processing of the image forming apparatus B are received so that the paper S carried out from the image forming apparatus B is received by the receiving unit C3 of the paper processing apparatus C. The position and height are adjusted so that the receiving part C3 of the apparatus C matches.

The image forming apparatus B and the sheet processing apparatus C include a control unit B1 and a control unit C1, respectively. Under the control of the control unit B1 and the control unit C1, the communication unit B2 and the communication unit C2, respectively. Various information is exchanged via
For example, information relating to the post-processing of the sheet set on the operation panel 9 of the image forming apparatus B is transmitted to the communication unit C2 of the sheet processing apparatus C via the communication unit B2 under the control of the control unit B1, and the sheet processing apparatus C performs post-processing based on the transmitted information related to post-processing under the control of the control unit C1.

Next, the configuration of the image forming apparatus B will be described.
The image forming apparatus B is based on a document image reading unit 1 that reads a document image from a document, an automatic document transport device 2 that transports a document to the document image reading unit 1, document image information read by the document image reading unit 1, and the like. An image forming unit 3 that forms an image, a paper feeding unit 4 that supplies the paper S to the image forming unit 3, a fixing unit 5 that fixes the toner image on the paper S, an operation panel having display means and operation switches. 9 and a control unit B1 for controlling them.

The document image reading unit 1 includes, for example, a platen glass, a CCD (Charge Coupled Device), a light source, and the like. The document image reading unit 1 forms an image of reflected light of light scanned on the document supplied from the light source by the automatic document feeder 2 or the document set at a predetermined position by the CCD, and performs photoelectric conversion. Thus, the image of the original is read as R, G, B signals, and the read analog signal is output to the image processing unit Ca.
The image processing unit Ca performs various image processing such as A / D conversion, shading correction, and image compression processing on the input analog signal, and performs Y (yellow), M (magenta), C (cyan), K (Black) Digital image data of each color is output and output to the image forming unit 3.

  The automatic document feeder 2 conveys documents stacked on the paper feed tray 2 a one by one to the document reading area of the document image reading unit 1. When the document is a double-sided document, the automatic document feeder 2 reverses the front and back of the document after one-sided reading of the document and conveys the document to the document image reading unit 1 again. The document that has been read is discharged to the discharge tray 2b.

  The image forming unit 3 includes, for example, drum-shaped photoreceptors (hereinafter simply referred to as photoreceptors) 1Y, 1M, 1C, 1K, charging devices 2Y, 2M, 2C, 2K, exposure devices 3Y, 3M, 3C, 3K, Toner supply devices 4Y, 4M, 4C, 4K, developing devices 5Y, 5M, 5C, 5K, intermediate transfer member 70, primary transfer rollers 6Y, 6M, 6C, 6K, cleaning means 7Y, 7M, 7C, 7K, secondary A transfer roller 75, a cleaning unit 77, and the like are provided.

The photoreceptors 1Y, 1M, 1C, and 1K corresponding to the colors Y, M, C, and K are uniformly charged by the charging devices 2Y, 2M, 2C, and 2K corresponding to the colors.
The exposure devices 3Y, 3M, 3C, and 3K corresponding to the respective colors form latent images on the charged photoreceptors 1Y, 1M, 1C, and 1K based on the digital image data output by the image processing unit Ca.

  The developing devices 5Y, 5M, 5C, and 5K are formed on the photoreceptors 1Y, 1M, 1C, and 1K by receiving the toner of each color from the toner replenishing devices 4Y, 4M, 4C, and 4K for replenishing new toner. The latent image corresponding to each color is visualized.

The developing devices 5Y, 5M, 5C, and 5K and the photoreceptors 1Y, 1M, 1C, and 1K are arranged in tandem in the vertical direction. An intermediate transfer member 70 is disposed on the side of the photoreceptors 1Y, 1M, 1C, and 1K.
The intermediate transfer body 70 is an endless belt-like member that is wound around rollers 71, 72, 73, and 74 so as to be rotatable, and has semiconductivity. The intermediate transfer body 70 is driven by a driving device (not shown) connected to the roller 71 by a roller 71.

The primary transfer rollers 6Y, 6M, 6C, and 6K corresponding to the respective colors are selectively operated according to the type of image by the control unit B1, and the intermediate transfer member 70 is respectively applied to the corresponding photoreceptors 1Y, 1M, 1C, and 1K. Press.
In this manner, the toner images of the respective colors formed on the photoreceptors 1Y, 1M, 1C, and 1K are sequentially transferred onto the rotating intermediate transfer body 70 to become a combined color image.

  The photoreceptors 1Y, 1M, 1C, and 1K receive a cleaning process by the cleaning units 7Y, 7M, 7C, and 7K after transferring the toner image to the intermediate transfer body 70. The residual toner on the photoconductors 1Y, 1M, 1C, and 1K is removed by the cleaning process.

The paper feed unit 4 includes, for example, a first paper feed cassette 41a, a second paper feed cassette 41b, and a third paper feed cassette 41c. A sheet S is accommodated inside each sheet cassette.
The stored sheets S are separated one by one by the sheet feeding unit 42, and conveyed to the secondary transfer region 75a through a plurality of intermediate rollers 43, 44, 45, 46, etc., and a registration roller 47.

The sheet S conveyed to the secondary transfer region 75a is subjected to secondary transfer by the intermediate transfer body 70 and the secondary transfer roller 75.
The secondary transfer roller 75 is urged toward the roller 72 only when the sheet S passes through the secondary transfer region 75 a and the secondary transfer is performed, and presses the sheet S against the intermediate transfer body 70. As a result, the color image formed on the intermediate transfer body 70 is collectively transferred onto the paper S.

  Further, the intermediate transfer member 70 receives a cleaning process by the cleaning unit 77 after transferring the color image onto the paper S. By this cleaning process, residual toner on the intermediate transfer member 70 is removed. Further, the sheet S on which the color image is transferred is subjected to a fixing process by the fixing unit 5.

The fixing unit 5 includes a heating roller 51 including a heating source H and a pressure roller 52. The paper S is sandwiched by the cooperation of the heat roller 51 and the pressure roller 52, performs a fixing process, and conveys the paper S. .
The paper S on which the fixing process has been performed is sandwiched between the paper discharge roller pair 76 and supplied to the paper processing apparatus C from the discharge port.

  The operation panel 9 includes a display unit 9a such as a liquid crystal display or an organic electroluminescence (EL) display, and performs various display outputs according to the processing contents of the control unit C1 and the control unit B1. The operation panel 9 includes an operation unit 9b that detects an input operation (for example, contact or proximity) to the display area of the display unit 9a and outputs a detection signal indicating a position (coordinate) where the input operation is detected. The control unit C1 and the control unit B1 accept an input operation by the user in association with the position indicated by the detection signal and the display content of the display unit 9a corresponding to the position. The operation panel 9 is not limited to the operation unit 9b, and may include switches and buttons for various inputs.

Next, the configuration of the sheet processing apparatus C will be described.
The paper processing apparatus C includes, for example, a receiving unit C3, a paper transport unit 110, a punching processing unit 120, a shift unit 130, a stacking unit 140, a stapling unit 150, a folding unit 160, a paper feeding unit 170, a discharge unit 180, and a stacking unit 190. , A blower mechanism 200, a control unit C1, and the like.
Among these, the discharge unit 180, the stacking unit 190, the blower mechanism 200, and the control unit C1 constitute a paper discharge device.

  The receiving unit C3 receives the sheet S, which is formed by the image forming apparatus B and discharged from the discharge port of the image forming apparatus B, into the sheet processing apparatus C.

The paper transport unit 110 transports the paper S to each part in the paper processing apparatus C.
The paper transport unit 110 includes a roller pair that transports the paper S supplied from the image forming apparatus B to the punching processing unit 120, a roller pair that transports the paper S subjected to the punching process to the branch point Q, and a paper from the branch point Q. A roller pair that transports S downward and reaches the stacking unit 140, a roller pair that transports the paper S from the branch point Q to the shift unit 130, a roller pair that transports the paper S upward from the branch point Q, and the like.

The punching processing unit 120 performs punching processing for forming punch holes in the paper S.
When the paper S is transported to a predetermined position, the punching processing unit 120 lowers the punch rod with respect to the punching position of the paper S and raises it again to form a punch hole.

  The shift unit 130 performs a shift process that shifts the sheet S that has traveled straight from the branch point Q in a direction perpendicular to the transport direction.

  The stacking unit 140 includes a sheet stacking plate 141 capable of stacking the sheets S in an inclined state, and stacks a predetermined number of sheets S conveyed downward from the branch point Q on the sheet stacking plate 141.

  The stapling unit 150 is provided below the paper stacking plate 141 of the stacking unit 140, and performs a staple process (binding processing) in which a binding needle is driven and bound to a predetermined number of sheets S stacked on the paper stacking plate 141.

When the folding process is selected, the folding unit 160 performs a folding process in which the paper S stapled by the staple unit 150 is folded at the center.
The folding unit 160 is provided below the stacking unit 140 and performs a folding process on the sheet S conveyed by the sheet stacking plate 141 moving downward.
The paper S folded by the folding unit 160 is discharged onto a paper discharge tray 161 provided so as to protrude downward outside the paper processing apparatus C.

The paper feed unit 170 is disposed on the upper stage of the paper processing apparatus C, and includes a first paper feed tray 171, a second paper feed tray 172, and a fixed paper discharge tray 173.
In the first paper feed tray 171 and the second paper feed tray 172, when cover sheets or the like are placed and booklet processing for attaching a cover to the paper S is selected, the first paper feed tray 171 or the second paper feed tray 172 The cover sheet taken out from the two sheet feeding trays 172 is conveyed to the stacking unit 140 and is combined with the sheets S stacked in the stacking unit 140 as a cover sheet.
For example, the paper S for which no paper processing is selected is discharged to the fixed paper discharge tray 173. That is, when no sheet processing is selected, the sheet S is conveyed upward from the branch point Q and discharged onto the fixed discharge tray 173.

  FIG. 3 is a schematic diagram illustrating the discharge unit 180, the stacking unit 190, and the blower mechanism 200.

  The discharge unit 180 includes, for example, a discharge roller pair 181 including a driving roller and a driven roller. The discharge unit 180 imparts a conveyance force by sandwiching the sheet S conveyed from the shift unit 130 and the stacking unit 140 from the front and back directions, and Discharge.

The stacking unit 190 includes, for example, an elevating / discharging table 191 provided so as to protrude outside the sheet processing apparatus C.
The elevating / discharging tray 191 has an abutment surface 191a inclined so that a leading end portion thereof is above the base end portion, and an abutting position where the rear end of the sheet S is brought into contact with the base end portion of the placement surface 191a. Part 191b. Since the sheet S discharged from the discharge roller pair 181 slides down on the placement surface 191a and the rear end comes into contact with the abutting portion 191b, alignment in the sheet transport direction is achieved.
Further, when the paper S is stacked on the placement surface 191a, the lifting / lowering tray 191 is lowered by a predetermined distance according to the weight of the paper S. As a result, the falling distance of the discharged paper S is kept constant. It may be configured such that the total thickness of the stacked sheets S is detected, and when the predetermined thickness is reached, the lifting / discharging tray 191 is lowered by a predetermined distance.

The blower mechanism 200 includes a first blower 201 that blows air to the upper surface side of the discharged paper S, and a second blower device 202 that blows air to the lower surface side of the discharged paper S.
In the following description, the wind (first wind) sent out from the first blower 201 is referred to as wind W1, and the wind (second wind) sent out from the second blower 202 is referred to as wind W2.

  The first blower 201 includes, for example, a blower 201a that generates the wind W1, a blower port 201b that blows out the wind W1 generated by the blower 201a, and a drive motor 201c that drives the blower 201a. Yes.

  The air blower 201a includes, for example, a sirocco fan or the like, and rotates at a predetermined speed according to the drive of the drive motor 201c, sucks air and generates a wind W1 having a predetermined wind pressure.

  The air blowing port 201b is installed in the vicinity of the upper part of the nip point of the discharge roller pair 181 and the wind W1 generated by the air blowing unit 201a is arranged on the upper surface side of the sheet S discharged from the discharge roller pair 181 and Air blows in parallel direction.

  The drive motor 201c is driven by the control of the control unit C1, and drives the blower unit 201a at a predetermined speed.

Here, the wind pressure (P1) of the wind W1 blown from the blower port 201b is preferably set to be larger than the air resistance (P0) received by the discharged paper S. That is, it is preferable to set so as to satisfy the relationship of the following formula (1).
P1 (wind pressure of wind W1)> P0 (air resistance) (1)

  The second blower 202 includes, for example, a blower 202a that generates the wind W2, a blower port 202b that blows out the wind W2 generated by the blower 202a, and a drive motor 202c that drives the blower 202a. Yes.

  The blower 202a includes, for example, a sirocco fan and the like, rotates at a predetermined speed in accordance with the drive of the drive motor 202c, sucks air, and generates a wind W2 having a predetermined wind pressure.

The air blowing port 202b is installed near the lower side of the nip point of the discharge roller pair 181, and the wind surface W2 generated by the air blowing unit 202a is placed on the lower surface side of the sheet S discharged from the discharge roller pair 181. The air is blown in the direction of a predetermined air blowing angle α.
The blowing angle α is preferably set to a value within a range of 30 ° to 60 °, for example. By setting the air blowing angle α to 30 ° or more, the wind hits the rear end of the paper S already placed on the placement surface 191a, so that the paper S rises and moves the paper S on the placement surface 191a. Can be prevented. In addition, by setting the air blowing angle α to 60 ° or less, the wind can reach the leading end of the paper S.

  The drive motor 201c is driven by the control of the control unit C1, and is driven at a predetermined speed of the blower unit 201a.

Here, the wind pressure (P2) of the wind W2 blown from the blower port 202b is preferably larger than the wind pressure (P1) of the wind W1 blown from the blower port 201b. That is, it is preferable to set so as to satisfy the following relationship (2).
P2 (wind pressure of wind W2)> P1 (wind pressure of wind W1) (2)

The control unit C1 controls the operation of each unit of the sheet processing apparatus C.
The control unit C1 includes, for example, a CPU (Central Processing Unit) 101, a RAM (Random Access Memory) 102, a ROM (Read Only Memory) 103, a storage unit 104, and the like. The CPU 101 stores storage devices such as the ROM 103 and the storage unit 104. Are read and processed, and various processes relating to the operation of each unit of the sheet processing apparatus C are performed.

For example, the control unit C <b> 1 controls the discharge roller pair 181 to discharge the paper S to the lift paper discharge table 191.
Further, when the sheet S is discharged from the discharge roller pair 181, the control unit C <b> 1 controls the blowing mechanism 200 to send the wind W <b> 1 and the wind W <b> 2 to the upper surface side and the lower surface side of the discharged sheet S. To do.
At this time, the control unit C1 can change and adjust the wind pressures P1 and P2 of the wind W1 and the wind W2 sent from the first blower 201 and the second blower 202 according to the thickness or basis weight of the paper S. For example, in the case of a thick paper or a paper with a large basis weight, the wind pressures P1 and P2 can be increased, and in the case of a thin paper or a paper with a small basis weight, the wind pressures P1 and P2 can be reduced. Even when the wind pressures P1 and P2 are changed and adjusted in this way, it is preferable to maintain the relationship of the above formulas (1) and (2).
In addition, when the paper S is placed on the lifting / lowering tray 191, the control unit C <b> 1 lowers the lifting / lowering tray 191 by a preset lowering amount according to the weight of the sheet S.

Next, the operation of the sheet S when the sheet is discharged from the discharge unit 180 to the stacking unit 190 will be described with reference to FIG.
As described above, in the present embodiment, when the sheet S is discharged from the discharge roller pair 181, the blowing operation by the blowing mechanism 200 is performed.
The blower mechanism 200 blows winds W1 and W2 for guiding the paper S in the discharge direction to the upper surface side and the lower surface side of the discharged paper S by the first blower 201 and the second blower 202.

Specifically, the first blower 201 blows wind W1 in the direction parallel to the placement surface 191a from the base end side of the placement surface 191a toward the front end side on the upper surface side of the paper S. Yes.
The wind pressure (P1) of the wind W1 is set to be larger than the air resistance (P0) received by the discharged paper S.
For this reason, for example, when a weak paper or a curled paper is discharged as the paper S, the leading edge is rounded due to the air resistance due to the discharge (two-dot chain line in FIG. 4). The upper surface of the sheet can be pressed with a strong force, and the roundness of the leading edge of the sheet S can be corrected.

In addition, the second air blower 202 has a direction that forms an angle of 30 ° to 60 ° with respect to the placement surface 191a from the base end side of the placement surface 191a toward the front end side on the lower surface side of the paper S. The wind W2 is blown.
Therefore, it is possible to prevent the wind S2 from hitting the rear end portion (region R in FIG. 4) of the paper S already placed on the placement surface 191a and moving the paper S. The wind can reach the tip of S.

Further, the wind pressure (P2) of the wind W2 is set to be larger than the wind pressure (P1) of the wind W1.
For this reason, the paper S can be pushed up from the lower surface with a force stronger than the force with which the wind W1 presses the upper surface of the paper S (the dashed line in FIG. 4), and the discharged paper S is placed on the placement surface 191a or the placement surface 191a. It is possible to avoid contact with the paper S already placed on the paper.
Therefore, the phenomenon that the sheet S buckles due to the friction between the sheet S and the placement surface 191a or between the sheets S and remains at the position where the rear end of the sheet S comes into contact with the abutting portion 191b (remaining rear end). ) Can be prevented.

As described above, according to the present embodiment, the discharge unit 180 that discharges the paper S, the stacking unit 190 that stacks the paper S discharged from the discharge unit 180, and the discharge of the paper S from the discharge unit 180 A first blower 201 that blows the wind W1 on the upper surface side of the paper S, a second blower 202 that blows the wind W2 on the lower surface side of the paper S when the paper S is discharged from the discharge unit 180, and a first blower And a control unit C1 that controls operations of the device 201 and the second blower 202.
For this reason, since the winds W1 and W2 for guiding the paper S are blown to the upper surface side and the lower surface side of the discharged paper S, the posture when the paper S is discharged can be stabilized.

Further, according to the present embodiment, the second blower 202 blows the wind W2 from the direction that forms the predetermined blow angle α with respect to the stacking unit 190, and the first blower 201 sends the wind W1 to the stacking unit 190. It blows from the direction parallel to the.
For this reason, the wind W1 strikes the paper S on the front end side in the discharge direction of the paper S relative to the wind W2, so that when the front end of the paper S in the discharge direction is rounded, this is effectively corrected. can do.

Further, according to the present embodiment, the control unit C1 performs the first ventilation so that the wind pressure (P1) of the wind W1 and the wind pressure (P2) of the wind W2 satisfy the relationship of the above-described formulas (1) and (2). The apparatus 201 and the 2nd air blower 202 are controlled.
For this reason, when the paper S is discharged, it is possible to prevent friction from being generated on the lower surface of the paper S while suppressing the rounding of the paper S.

Further, according to the present embodiment, the control unit C1 changes and adjusts the wind pressure (P1) of the wind W1 and the wind pressure (P2) of the wind W2 according to the thickness or basis weight of the paper S.
For this reason, it is possible to execute an appropriate air blowing operation according to the thickness or basis weight of the paper S.

In the above embodiment, the wind W1 from the first blower 201 is blown in parallel with the placement surface 191a, but the wind W1 also blows from a direction that forms a predetermined angle with respect to the placement surface 191a. It's also good. In this case, it is preferable that the angle of the wind W1 with respect to the mounting surface 191a is an angle equal to or smaller than the air blowing angle α with respect to the mounting surface 191a of the wind W2. For example, the air blowing angle α with respect to the placement surface 191a of the second blower 202 can be set to 60 °, and the angle with respect to the placement surface 191a of the first blower 201 can be set to 40 °.
Even in such a configuration, the wind W1 strikes the paper S in the discharge direction front end side of the paper S with respect to the paper S2, so that it is effective when the front end of the paper S in the discharge direction is rounded. This can be corrected.
Even in this case, it is preferable that the wind pressures P1 and P2 of the wind W1 and the wind W2 satisfy the relationship of the expressions (1) and (2).

Moreover, in the said embodiment, although the control part C1 illustrated and demonstrated the case where the ventilation operation | movement which satisfy | fills the relationship of Formula (1) (2) was illustrated, as ventilation operation | movement which control part C1 can perform, In addition to this, for example, depending on the type of the sheet S or the image forming conditions, the blowing of either the first blower 201 or the second blower 202 may be stopped.
For example, a thick paper S or a paper S with a low printing rate and a small curl is difficult to curl, and therefore, control such as stopping the blowing from the first blower 201 can be performed.

  Further, as the air blowing operation that can be executed by the control unit C1, the first air blowing device 201 and the second air blowing device 202 are alternately driven in a short cycle with the same air pressure of the first air blowing device 201 and the second air blowing device 202. And it is good also as repeating a stop.

  Further, in the above-described embodiment, the configuration in which the blower mechanism 200 is provided in the paper processing apparatus C has been described as an example. However, for example, as illustrated in FIG. 6, the blower mechanism 200 may be provided in the image forming apparatus B. it can. In this case, the discharge unit 180 includes a discharge roller pair 76 instead of the discharge roller pair 181, and a stacking unit 190 that protrudes to the outside is provided near the discharge roller pair 76.

Moreover, the structure shown in the said embodiment can be suitably changed within the range which does not deviate from the main point of this invention.
For example, the blowing angles of the air blowing port 201b of the first air blowing device 201 and the air blowing port 202b of the second air blowing device 202 may be configured to be variable instead of being fixed.

  Further, the air blowing port 201b of the first air blowing device 201 and the air blowing port 202b of the second air blowing device 202 are long in the paper width direction so that the winds W1 and W2 are blown over the entire width direction of the paper S. It is good also as forming in. Further, the first blower 201 and the second blower 202 may each include a plurality of blower openings 201b and blower openings 202b arranged along the paper width direction.

In addition, as the blower mechanism 200, for example, one blower unit, one drive motor that drives the blower unit, first and second blower paths that divide the air blown from the blower unit into two, The first and second air outlets may be configured to be provided at the front end of the first and second air passages and to send air to the upper surface side and the lower surface side of the sheet S, respectively. In this case, the first blower is configured by a blower, a drive motor, a first blower path, and a first blower opening, and the second blower is provided by a blower, a drive motor, a second blower path, and a second blower. It will consist of a mouth.
Such a configuration is preferable from the viewpoint of energy saving because one drive motor can be provided.

  In addition, at least one of the first blower 201 and the second blower 202 includes an ion generation unit, and at least one of the wind W1 and the wind W2 includes ions to remove static electricity from the paper S. It is also good to do.

A Image forming system B Image forming apparatus C Paper processing device 180 Discharge unit (paper discharge device)
181 discharge roller pair 190 stacking unit (paper discharge device)
191 Lifting / discharging tray 191a Placement surface 191b Abutting section 200 Blower mechanism (paper discharge device)
201 First blower (first blower)
201a Blower 201b Blower 201c Drive motor 202 Second blower (second blower)
202a Blower 202b Blower 202c Drive motor C1 Controller (paper discharge device)
C3 receiving part W1 wind (first wind)
W2 wind (second wind)

Claims (7)

A discharge section for discharging paper;
A stacking unit for stacking sheets discharged from the discharging unit;
First blowing means for blowing a first wind toward the upper surface of the paper when the paper is discharged from the discharge section;
Second air blowing means for blowing a second wind toward the lower surface of the paper when the paper is discharged from the discharge portion;
A control unit for controlling the operation of the first blower and the second blower;
A paper discharge device comprising: The second blowing means blows the second wind from a direction forming a predetermined angle with respect to the stacking unit,
2. The sheet according to claim 1, wherein the first air blowing unit blows the first wind in a direction parallel to the stacking unit or in an angle that is less than the predetermined angle with respect to the stacking unit. Paper discharge device. The control unit includes a first air blowing unit and a second air blowing unit so that the wind pressure (P1) of the first wind and the wind pressure (P2) of the second wind satisfy a relationship of the following expressions (1) and (2). The paper discharge device according to claim 2, wherein the blower is controlled.
P1> P0 (P0: air resistance that the sheet receives during discharge) (1)
P2> P1 (2)   The said control part changes and adjusts the wind pressure (P1) of a said 1st wind, and the wind pressure (P2) of a said 2nd wind according to the thickness or basic weight of a paper. Paper discharge device.   The paper discharge device according to claim 1, wherein the control unit stops the air blowing of the first air blowing unit according to a paper type or an image forming condition. Connected to an image forming apparatus having an image forming unit for forming an image on paper;
A sheet processing apparatus comprising the sheet discharge apparatus according to claim 1, which discharges the sheet discharged from the image forming apparatus. An image forming unit for forming an image on paper;
The paper discharge device according to any one of claims 1 to 5, wherein the paper on which the image is formed by the image forming unit is discharged.
An image forming apparatus comprising:

Images