JP3701546B2 - Sheet storage device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sheet storage device used for stacking and stacking image-formed sheets discharged from an image forming apparatus such as a copying machine or a printer.
[0002]
In particular, sheets that are sequentially discharged are stacked or placed with good alignment, and sheets that have already been stacked or placed and sheets that are subsequently discharged collide with each other to eliminate jamming. The present invention relates to a sheet storage device that does not deteriorate the stacking performance or the loading performance.
[0003]
[Prior art]
2. Description of the Related Art Conventionally, an apparatus that stacks and stacks sheets formed with an image forming apparatus such as a copying machine or a printer is known. This type of apparatus not only stacks a relatively large amount of imaged sheets, but also temporarily places sheets discharged from the image forming apparatus in front of the stack. In the loaded state, a predetermined process such as sheet alignment, binding, or sorting by sheet shift is performed. After this process is performed, stacking is performed.
[0004]
In this way, as an apparatus that achieves a relatively small size in an apparatus for stacking sheets or stacking sheets or temporarily stacking sheets before the stacking stack and performing predetermined processing on the sheets, then stacking and stacking the sheets. U.S. Pat. Nos. 5,021,837, 5,137,265, and 5,385,340.
[0005]
However, in the apparatuses disclosed in these documents, the sheet stacking performance is improved when stacking sheets, or the sheet mounting performance is improved when temporarily placing sheets before this stacking. There is not enough consideration for.
[0006]
That is, jamming occurs when the sheet that has already been stacked or placed and the leading edge of the sheet that is subsequently fed come into contact with each other, or the sheet that has been stacked or placed is curled. There is a possibility that the sheets will be stacked and stacked and placed in a bent state, and it has been determined that the stacking and placement has reached the limit amount with a small amount of sheets without reaching the preset accumulation amount or placement amount. Thus, the apparatus had to be stopped.
[0007]
[Problems to be solved by the invention]
In order to solve this problem, the height of the sheet discharge port and the support surface that receives the sheet should be made sufficiently long, but this time when the leading edge of the discharge sheet is discharged by the downward curl on the sheet support surface side, the support The sheet was discharged while curled downward on the surface, and the sheets were folded and accumulated and placed, causing the same problem as described above.
[0008]
It is an object of the present invention to stack and stack sheets to be discharged while performing unnecessary stacking and curling of unstacked sheets and subsequently discharged sheets. An object of the present invention is to provide a sheet storage device that prevents this and improves the performance of stacking sheets.
[0009]
Still another object of the present invention is to provide a sheet storage device that is compact and lightweight as the entire device while stacking or placing the sheets with high accuracy.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, a sheet storage device according to the present invention includes a discharge unit that discharges a sheet from a discharge port, and a sheet that is inclined so as to become higher toward the downstream side in the sheet discharge direction by the discharge unit. A sheet placement surface to be placed; a first sheet placement surface on which the sheet is placed at a first angle formed by the sheet placed on the sheet placement surface and the sheet placement surface; An angle changing unit that changes the angle of the sheet placing surface upstream of the position where the first sheet placing surface and the sheet discharged by the discharging unit intersect, and upstream of the angle changing unit. A second sheet placement surface for placing the sheet rear end portion upstream of the sheet discharge direction at an angle larger than the first angle on the side, and a sheet trailing edge at the end of the second sheet placement surface Provided below the discharge means to restrict movement Between the sheet edge regulating member formed and the retracted position retracted to the back side of the sheet edge regulating member and the pressing position for pressing the rear end side of the discharged sheet against the second sheet placement surface. A movable sheet pressing means, and a sheet edge regulating member that reciprocates the sheet pressing means between the retracted position and the pressing position below the sheet discharging means each time the sheet is discharged by the discharging means. Driving means such as a solenoid disposed on the back side; A sheet flapper that is moved by the sheet ejected from the ejecting unit and drops a rear end of the ejected sheet toward the second sheet placement surface, the sheet pressing unit; A plurality of sheet flapper means are provided at intervals in a direction intersecting the sheet discharge direction, and the sheet flapper means is arranged so that the sheet flapper means operates between the strips of the sheet pressing means. It is a sheet storage device.
[0011]
According to the present invention, in the sheet storage device, when the sheet pressing unit moves to a pressing position for pressing the sheet on the second sheet mounting surface, the position of the sheet pressing unit is detected and the sheet mounting surface is detected. A detection sensor for detecting the amount of the placed sheet is provided.
[0012]
Further, according to the present invention, in the above-described sheet storage device, a sheet rear end detection unit is provided on the upstream side of the discharge unit that operates the driving unit of the sheet pressing unit.
[0013]
According to the present invention described above, when stacking discharged sheets, unnecessary contact between the stacked sheets and subsequently discharged sheets is performed, and the sheets are stacked and placed while being curled. Can be prevented.
In particular, since the trailing edge of the sheet is pressed on the second sheet placement surface having a deeper angle than the first sheet placement surface, the rear end of the sheet is greatly curled toward the discharge port side to block the discharge port, It is possible to prevent the subsequent sheet from being discharged and jamming. Further, since the sheet pressing unit moves from the back side of the sheet edge regulating member below the sheet discharging unit, the pressing unit does not interfere with the discharge of the subsequent sheet. In addition, since the loaded sheet can be pressed for a relatively long time, it is possible to restrict the loaded sheet from being pushed and moved by discharging the subsequent sheet, and the consistency of the stacked sheets is lost. There are few things.
[0014]
In addition, it is possible to provide a sheet storage device that is small and light as the entire device.
Other objects and features of the present invention will become apparent from the following detailed description based on the accompanying drawings.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
The present invention relates to a sheet storage apparatus that collects discharged sheets or improves stacking performance and stacking performance when temporarily stacked and placed before discharging, and an embodiment thereof will be described with reference to the accompanying drawings. .
[0016]
1, 2, and 3, a finisher device 1 as a sheet storage device is provided adjacent to an image forming apparatus G such as a copying machine main body or a printer main body. In this case, it is desirable that the device G is detachably attached.
[0017]
The finisher device 1 includes a main body device 2, a staple unit 3 attached to one side frame 2 a of the main body device 2, and a drive transmission system described after being disposed on the other side frame 2 b of the main body device 2. 4 (see FIGS. 9 and 10), a receiving port 7 to which an image-formed sheet S discharged from the image forming apparatus G is supplied, and a discharging port 10 formed on the surface opposite to the receiving port 7, A stacking tray 5 that protrudes from the front of the main body 2 and stacks and stacks sheets S discharged from the discharge port 10, and a sheet that is positioned above the stacking tray 5 and discharged from the second discharge port 12 is accommodated. Escape tray 6 is provided.
[0018]
As shown in FIG. 3, the main body device 2 has a first conveyance path P1 that guides the sheet S from the receiving port 7 to the inside, and a discharge port 10 directly from the first conveyance path P1. A second transport path P2 connected to the stacking tray 5 via the discharge path, and a processing tray as a temporary placement tray for temporarily storing the sheet S by separating a step from the second transport path P2 and switching back the transport direction. 29, a third conveyance path P <b> 3 that conveys the sheet S into the area 29, and a fourth conveyance path P <b> 4 that branches from the middle of the first conveyance path P <b> 1 and guides the sheet S to the second discharge port 12.
[0019]
That is, the “through-pass mode” in which the sheet S is directly discharged from the first conveyance path P1 to the stacking tray 5 via the second conveyance path P2, and the sheet S from the second conveyance path P2 to the third conveyance path P3. A plurality of sheets are placed and aligned on the processing tray 29 along the switchback, and a stapling process is performed by the staple unit 3 and then bundled and discharged to the stacking tray. The first conveying path P1 to the fourth conveying path There is an “escape mode” in which the sheet S is conveyed to P4 and discharged onto the escape tray 6.
[0020]
In the first conveyance path P1, the sheet S is cooperated with the conveyance guide 8 for guiding conveyance of the sheet S supplied from the receiving port 7, the entrance sensor 11 for detecting that the sheet is supplied, and the driven roller 14. Is further directed to the downstream side, and the sheet S conveyed by the conveyance drive roller 15 is further guided toward the endless conveyance belt 18 as a front sheet transfer means, and to the fourth conveyance path P4. And a rotary flapper 16 that switches the conveyance path depending on the direction of guidance.
[0021]
The endless conveyance belt 18 cooperates with the driven roller 17 to convey the sheet S to the second conveyance path P2. The endless transport belt 18 is a rubber ring-shaped endless belt, and is rotated by a belt drive roller 19 fixed to a drive shaft 19a, and can be deformed in the vertical direction of FIGS. It is flexible.
[0022]
A processing tray unit 20 is provided below the endless conveyance belt 18. The processing tray unit 20 is for temporarily placing the sheets S in order to sequentially place the sheets S and perform stapling by the staple unit 3 for each predetermined number of sheets.
[0023]
In the embodiment, staple binding is performed by bundling a predetermined number of sheets S. However, in order to make holes in the sheets or to align a plurality of sheets S before being discharged to the stacking tray 5, It can also be used for mounting.
[0024]
A rotating unit 24 that rotates up and down around the paddle driving roller shaft 21a is provided above the second transport path P2. The rotating unit 24 discharges the sheet S from the first transport path P1 directly to the stacking tray 5 through the discharge port 10, or discharges a plurality of sheet bundles in the processing tray unit to the stacking tray 5. 2 is located at the lower position, which is the solid line position shown in FIG. 2, and when the sheet S is guided to the third transport path P3 into the processing tray 11, it is located at the upper position indicated by the two-dot chain line in FIG. .
[0025]
In the rotating unit 24, a rubber paddle 23 provided on a paddle rotating shaft 22 that rotates following rotation of a paddle driving roller 21 fixed to the paddle driving shaft 21 a, and a free end of the rotating unit 24. A driven discharge roller 25 is provided on the side. The driven discharge roller 25 cooperates with a discharge roller 26 positioned below the driven discharge roller 25 to discharge the sheet S or a bundle of sheets S from the discharge port 10 to the stacking tray 5.
[0026]
The paper discharge port 10 of the main body device 2 is provided with the discharge roller 26 which is opposed to the discharge driven roller 25 and rotated by a drive shaft 26a.
[0027]
Below the discharge roller 26 in the figure, a sheet abutting surface 2c as a sheet edge regulating member for regulating the edge of the sheet S stacked and stacked on the stacking tray 5 is formed integrally with the front frame of the main body device 2. Has been. A sheet pressing lever 78 that protrudes and retracts toward the stacking tray 5 from a position above the sheet abutting surface 2c close to the discharge roller 26 of the sheet abutting surface 2c is provided. The sheet pressing lever 78 moves so as to protrude toward the stacking tray 5 every time the sheet S or the bundle of sheets S is discharged by the discharge roller 26 and the driven discharge roller 25.
[0028]
Therefore, as will be described in detail later, the sheet presser lever 78 is used to improve the stacking property of the sheets S on the stacking tray 5 while keeping the edge of the sheets stacked and stacked, and the sheets S stacked on the stacking tray 5 can be stacked. It is possible to prevent the jammed sheet (sheet jam) of the discharged sheet S that is subsequently discharged by abutting the leading edge of the sheet S that is subsequently curled with the edge curled.
[0029]
In the present embodiment, the sheet S pressing lever 78 is driven so as to protrude and retract from the sheet abutting surface 2C by a pressing lever solenoid 83 located on the back side of the sheet abutting surface 2C.
[0030]
The fourth conveyance path P4 is provided with a conveyance guide 13, which is used for post-processing such as a stapling function and a sorting function on the image-formed sheet S, or for a special sheet having an irregular size, and is driven. A second discharge roller 28 for discharging the sheet S from the second discharge port 12 to the escape tray 6 in cooperation with the roller 27 is provided.
[0031]
The above is the outline of the configuration of the main unit 2. The configuration of each unit or each mechanism will be further described below with reference to FIGS.
[0032]
As shown in FIGS. 3 and 4, the processing tray unit 20 receives a processing tray 29 as a temporary placement tray on which a sheet is temporarily placed for performing a stapling process, and a sheet S conveyed on the processing tray 29. A sensor lever 30 to detect, a sheet presser 31 as sheet pressing means provided in two front and rear positions located along the sheet S carry-in direction contacting the uppermost upper surface of the sheet S on the processing tray 29, and the processing tray 29 And an alignment plate 34 as alignment means for aligning the sheets S stacked thereon.
[0033]
The processing tray 29 rises from the rear end of the sheet placing portion 29a and is placed on the side edge of the sheet S on the sheet placing portion 29a. A processing sheet leading edge regulating piece 29b as a sheet regulating means to be engaged is integrally formed.
[0034]
Further, the width of the processing tray 29 is larger than the width of the maximum sheet size sheet S fed to the main body apparatus 2, but the length in the sheet conveyance direction, that is, the interval from the receiving port 7 to the discharge port 10 is short regardless of the sheet size. it can. This is because the sheet can be placed on the processing tray 29 and the stacking tray 5 across the sheet.
[0035]
One end of the sensor lever 30 extends to the second transport path P2 on the discharge port 10 side, is rotatably supported by a sensor rotating shaft 30c below the processing tray 29, and has a sheet presence sensor on the other end. When the sheet S is not present, the sensor flag 30b is detected by the sensor 30a. As shown in FIGS. 2 and 3, one end side is separated from the sheet placing portion and extends to the second conveyance path P2. .
[0036]
The sensor lever 30 can detect the state of the sheet S when the sheet S is not conveyed on the second conveyance path P2 and when the sheet S is not placed on the sheet placement portion 29a of the processing tray 29.
[0037]
Therefore, even when the sheets S are not placed on the sheet placement portion 29a and are stacked one by one on the stacking tray 5 through the second transport bus P2 directly from the first transport path P1, It also functions as a conveyance passage sensor for the sheet S discharged when the trailing edge is detached from the sensor lever 30.
[0038]
Further, when the sheet is discharged from the processing tray 29 as a bundle, the sheet S can be detected as a bundle discharge passage sensor. The passage detection signal from the sensor lever 30 is used as an operation signal for the presser lever solenoid 83 that operates the sheet presser lever 78 described above.
On the discharge port 10 side of the sheet placement portion 29a, a seat waist guide 42 is provided that is positioned slightly above the outer peripheral surface of the discharge roller 26.
[0039]
By the way, the finisher device 1 switches the sheet S from the second conveyance P2 to the third conveyance path P3 and places it on the processing tray 29. As described above, since the processing tray 29 is set to be extremely shorter than the length in the conveyance direction of the sheet S, the sheets S are stacked in a state of straddling the processing tray 29 and the stacking tray 5.
[0040]
Therefore, when the sheet S is shifted in the width direction substantially orthogonal to the conveyance direction for alignment on the processing tray 29, the sheet S does not come into contact with the discharge roller 26 made of a high friction material such as a rubber member, and as much as possible. It is desirable that the sheet S be seated in a chevron shape with the discharge roller portion as the apex.
[0041]
On the other hand, when the sheet S is directly discharged from the first conveyance path P1 to the stacking tray 5 via the second conveyance path P2 without placing the sheet S on the sheet placement portion 29a, the leading edge of the sheet S is the discharge roller 26. It is desirable to keep the discharge roller 26 and the sheet S in a non-contact state until the sheet passes through. In order to achieve these, the seat waist guide 42 is provided.
[0042]
The seat waist guide 42 is interlocked with the vertical movement of the rotation unit 24, and when the rotation unit is at the lower position shown by the solid line in FIG. Located inside the surface.
[0043]
As shown in FIG. 4, the alignment unit 33 is fixed to an alignment plate 34, an alignment plate drive motor 36, and an output shaft 36 a of the alignment plate drive motor 36 arranged in a direction crossing the sheet S conveyance direction. A pinion gear 37, a rack gear 39 provided on the bottom surface of the alignment plate 34 and meshing with the pinion gear 37, an alignment plate position detection sensor 35 for detecting the position of the alignment plate 34 below the rack gear 39, and this sensor A traverse rack gear 39 and an integral alignment flag 38 are provided.
[0044]
Therefore, each time the sheet S is carried into the processing tray 29a along the third conveyance path P3, the alignment plate 34 is applied to the sheet S by rotation of the alignment plate drive motor 36 in a direction substantially orthogonal to the conveyance direction of the sheet S. The sheet S is moved so as to be in contact with each other, and the sheet S is brought into contact with the main body side frame 2a to which the staple unit 3 at a position opposite to the moving direction of the aligning plate 34 is attached.
[0045]
In this embodiment, the alignment plate 34 is provided only on one side in the width direction of the sheet S. However, the alignment is performed so that the sheet S is sandwiched by a pair of alignment plates that are close to and away from each other in the width direction of the sheet S. Operation may be performed.
[0046]
Here, the endless conveyance belt 18 will be described. As described above, the sheet S is transported toward the second transport path P2 in cooperation with the driven roller 17, but the sheet S is also engaged with the sheet S in the third transport path P3 and the sheet S is moved to the leading edge of the sheet. It is comprised so that it may convey toward the control piece 29b.
[0047]
That is, as shown in FIGS. 3 and 4, the endless conveyance belt 18 has a toothed shape with a fine engagement surface with the sheet S, and 18 a in the drawing is a sheet pulling conveyance section that is drawn from the first conveyance path P <b> 1. 18b also acts as a drop-in portion for dropping the trailing end of the sheet S in the conveyance direction from the second conveyance path P2 to the third conveyance path P3 in cooperation with a paddle 23 described later, and further in the third conveyance path P3. Acts as a sheet retraction part for conveying the sheet S.
[0048]
Since the endless conveying belt 18 is made of a deformable flexible material, the sheet feeding portion 18c rises according to the thickness of the sheet S even when the sheets S are sequentially stacked on the loading tray portion 29a.
[0049]
Referring to the positional relationship between the endless conveyance belt 18 and the alignment plate 34, as shown in FIGS. 3 and 4, the sheet retraction portion 18c of the endless conveyance belt 18 is within the length range of the alignment plate 34 in the conveyance direction. positioned. The alignment plate 34 moves and shifts the sheet S in the width direction after the edge of the sheet S reaches the sheet S leading edge regulating piece 29b by the endless conveying belt 18, but the sheet S and the sheet retraction portion 18c are aligned during this alignment. Since the contact state is established, if the sheet retracting portion 18c is positioned outside the alignment plate 34, a force for rotating the sheet S around the sheet retracting portion 18c acts to prevent the alignment from being performed correctly. In addition, by disposing the sheet retracting portion 18c in the alignment plate 34, the entire length of the apparatus main body device 2 in the conveying direction can be shortened and made compact.
The aligning plate 34 extends from the position of the sheet feeding portion 18c of the endless conveying belt 18 to the discharge roller 26. This is a sheet on which the sheet is placed across the processing tray 29 and the stacking tray 5. This is because both the bent portion and the position of the sheet feeding portion 18c of the endless conveying belt 18 are aligned.
[0050]
Next, the sheet retainers 31 and 32 arranged on the sheet placing portion 29a will be described with reference to FIGS.
[0051]
As described above, the sheets S placed on the processing tray 29 are sequentially fed and placed by the endless transport belt 18 along the third transport path P3. At this time, the sheet S is conveyed while being pressed against the sheet placement portion 29a by the first sheet presser 31 and the second sheet presser 32 that are rotatably attached to the support member 40 above the processing tray 29, and is processed. Even after the edge of the sheet S reaches the sheet leading edge regulating piece 29b of the tray 29, the sheet S is curled and placed with good alignment without disturbing the subsequent sheet S, and post-processing such as stapling is performed. I am doing so.
[0052]
That is, the first sheet presser 31 has a base end portion 31a that enters the support member 40 and is rotatably attached to the support shaft 40a of the support member 40, and a front end portion 31b of the first sheet presser 31 is a sheet front end regulating piece 29b of the processing tray. It hangs down at a position close to and in contact with the sheet placing portion 29a. Further, the front end portion 31b of the first sheet presser 31 is positioned so as to partially overlap the sheet front end regulating piece 29b of the processing tray. This overlap is to prevent the edge of the sheet S from passing between the leading end portion 31b and the sheet leading end regulating piece 29b.
[0053]
Next, the second sheet presser 32 is rotatably attached to the second support shaft 40c of the support piece 40b whose base end portion 32a is attached to the support member 40, and its distal end portion 32b is endless transport belt 18. It hangs down from the streak toward the sheet placing table 29a.
[0054]
Further, as shown in FIG. 5, the second sheet presser 32 maintains a distance h from the sheet placing portion 29a when the stopper portion 32c comes into contact with the restricting portion 40d provided on the support piece 40b. Is located. Accordingly, in the second sheet presser, the tip end portion 32b does not come into contact with the sheet S unless the stacked placement thickness of the sheets S on the sheet placement portion 29a is equal to or more than h.
[0055]
As described above, the distal end portion 32b of the second sheet presser 32 is separated from the sheet placement portion 29a because when the number of sheets S is small, resistance and damage to the sheets S are reduced, and a predetermined number (distance) h) or more, or when an upward curl exceeding the distance h occurs on the sheet S, the sheet S is contacted and pressed.
[0056]
Accordingly, when the number of sheets S to be placed on the sheet placement portion 29a is small or the curl is small, the sheet S is first pressed only by the first sheet presser 31, and the number of sheets S placed increases or a large curl occurs. When it occurs, the sheet S is also pressed by the second sheet presser 32.
[0057]
Further, when the sheet S is largely curled like the sheet S indicated by the one-dot chain line in FIG. 5, the leading end portion 32 b of the second sheet presser 32 comes into contact with and engages with the rear portion 31 c of the first sheet presser 31. It is like. This is because when the curl of a predetermined amount or more occurs in the sheet S, the weight of the first sheet presser 31 is applied to the leading end portion 32b of the second sheet presser 32, and this curl is quickly eliminated.
[0058]
By the way, the second sheet presser 32 having the leading end portion 32b separated from the sheet placing portion 29a is positioned upstream of the first sheet presser 31 in the loading direction when the sheet S is generally inserted into the processing tray 29. According to this embodiment, when the number of loaded sheets S is small, the sheet S is pressed only by the first sheet presser 31 in the vicinity of the leading edge regulating piece 29b, and when the number of loaded sheets S increases, the first sheet presser 31 is increased. At the same time, the second sheet presser 32 also performs the pressing operation of the sheet S, and the pressing force on the sheet can be increased by increasing the number of sheets S carried in, so that the sheet stacking and accumulating performance can be improved.
[0059]
Further, as shown in FIG. 6, the first sheet presser 31 and the second sheet presser 32 are arranged in a row in the width direction of the sheet S, and one end of the sheet placed on the sheet placement unit 29 a. I'm trying to hold a lot of sides. Accordingly, post-processing such as binding by the staple unit 3 can be performed on the end portion of the sheet in a state where the sheets are correctly aligned.
[0060]
In the above-described embodiment, the leading end portion 31b of the first sheet presser 31 is in a state where the sheet S is not placed on the sheet placement portion 29a and is in contact with the sheet placement portion 29a. However, in this case, the front end of the first sheet presser 31 may be at a distance smaller than the distance h between the front end part 32b of the second sheet presser 32 and the sheet mount part 29a. What is necessary is just to set the part 31b and the sheet | seat mounting part 29a.
[0061]
In addition, the first sheet presser 31 and the second sheet presser 32 are arranged in two rows in the sheet conveyance direction, but this may be three rows and four rows, and from the point that the pressing force on the sheet S is changed, it is the same row. You may line up.
[0062]
Further, as shown in FIG. 7, the second sheet presser 32 may be omitted, and a coil spring 40 f may be interposed between the support member 40 and the first sheet presser 31. One end of the coil spring 40 f is positioned on the spring pin 40 e provided on the support member 40, and the spring contact portion 40 g on the other end is positioned on the back side of the first sheet presser 31. Therefore, when the number of sheets S is small, the elastic force of the coil spring 40f does not act, and the elastic force of the coil springs 40f is gradually increased as the number of sheets S is increased. The force for pressing the sheet S may be increased.
[0063]
The sheet S placed on the processing tray 29 is bound by the staple unit 3, and the staple unit 3 of the present embodiment is configured such that the sheet placement portion 29 a of the processing tray 29 is shown in FIGS. 1 and 4. Is inclined at substantially the same angle as that of the side frame 2a. The staple unit includes a head portion 3a for driving a staple needle into the front end portion of the sheet S from the main body frame 2 toward a sheet placement portion 29a located therein, and an anvil for bending the staple needle driven by the head portion 3a. Part 3b. In addition, a replaceable cartridge 3c that houses a needle is provided on the back side that is the outside of the main body frame 2.
[0064]
The stapler unit 3 is for driving the staples from the upper surface side of the sheet on the sheet placing portion 29a. However, the stapler needle is driven from the lower surface side of the sheet S with the head portion 3a and the anvil portion 3b turned upside down. You may comprise as follows.
[0065]
Next, referring to FIG. 3, the rotation unit 24 located above the sheet discharge port side of the processing tray 29 will be described. As shown in the plan view of FIG. 8, the rotating unit 24 includes a paddle 23, a paddle rotating shaft 22 that rotates the paddle 23, a paddle driving belt 22 a that transmits driving to the paddle rotating shaft 22, and a paddle A paddle drive roller 21 that drives the drive belt 22a and a driven discharge roller 25 that is positioned at the discharge port 10 and discharges the sheet S in cooperation with the discharge roller 26 on the main body frame 2 side are provided. The paddle drive roller 21 is rotationally driven by a paddle drive roller shaft 21a that is driven and rotated by a paddle drive transmission gear 54 that is a part of the drive transmission system 4 provided in the main body side frame 2a. Further, the rotation unit 24 swings up and down between a position close to the paper discharge roller 26 and a position away from the paper discharge roller 26 with the paddle drive roller shaft 21 a as an axis fulcrum. This up and down swinging motion is performed by engaging a lift unit 64 with a lift pin 64 b protruding from a lift lever 64 provided in the drive transmission system 4.
[0066]
The rotation unit 24 is provided at the shaft fulcrum of the paddle drive roller 21a, and is always discharged by a rotation unit spring 24b having one end in contact with the main body frame 2 and the other end in contact with the frame of the rotation unit 24. It is urged to the lower side. The rotating unit 24 is controlled to swing up and down by the lift lever 64 that moves against the biasing force.
[0067]
The main body device 2 performs the “through-pass mode” in which the sheet S is directly discharged from the first conveyance path P1 to the stacking tray 5 via the second conveyance path P2, and the third conveyance of the sheet S from the second conveyance path P2. A switchback conveyance along the path P3 is performed, and a plurality of sheets are placed and aligned on the processing tray 29. After the stapling unit 3 performs a binding process, a “staple mode” for discharging the bundle to the stacking tray and a branch from the first conveyance path P1 And the “escape mode” for discharging the special sheet S to the escape tray 6 along the fourth conveyance path P4.
[0068]
The conveyance drive roller 15, the endless conveyance belt 18, the discharge roller 26, the paddle 23, the rotation unit 24, the second discharge roller 28, and the like disposed in the first conveyance path P1 to the fourth conveyance path P4 are driven. The system that performs this will be described below.
[0069]
As shown in FIGS. 9 and 10, the drive transmission system 4 of the present embodiment includes one drive motor 43 and an output pulley that rotates in the counterclockwise direction provided on the output shaft 43 a of the one drive motor 43. 44, a drive pulley 45 provided on the rotation shaft 15a of the conveyance drive roller 15 disposed on the receiving port 10 side, a drive pulley 47 provided on the rotation shaft 28a of the second discharge roller 28, and the endless conveyance belt 18 A drive pulley 46 provided on the rotary shaft 19 a of the drive roller 19 that rotates, a rotation belt 48 that transmits the drive from the output pulley to the drive pulleys 45, 46, 47, and a rotation that is coaxial with the drive pulley 46. A large-diameter timing gear 55 connected via a driven transmission gear 53 meshed with a transmission gear 51 provided on the shaft 19a and a rotary shaft 26a of the discharge roller 26 are provided with a timing. A transmission gear 56b connected to the gear 55 via an intermediate gear 56a, a paddle drive shaft 21a that rotatably supports the rotation unit 24 and that rotationally drives the paddle drive roller 21, and a driven transmission gear 52. A paddle transmission gear 54 provided with a lock plate 54c on the outer periphery connected to a transmission gear 51 coaxial with the drive pulley 46, a paddle drive belt 22a connecting the paddle rotation shaft 2 supporting the paddle drive roller 21 and the paddle 23, A cam 65 provided on the timing gear 55 and a lift lever 64 that engages with the rotating unit 24 by a pin 64b and swings the rotating unit 24 up and down by the rotation of the cam 65 are included.
[0070]
In the figure, reference numerals 49 and 50 denote tension rollers for applying tension to the rotating belt 48.
When the sheet S is fed from the receiving port 7 of the apparatus main body 2 and the leading edge of the sheet S is detected by the entrance sensor 11 and the apparatus is in an operating state, the conveyance driving motor 43 is activated and the driving pulley 45 is connected by the rotating belt 48. The conveyance drive roller 15, the second discharge roller 28 connected to the drive pulley 47, and the endless belt drive roller 19 that drives the endless conveyance belt 18 connected to the drive pulley 46 are moved forward (downstream in the conveyance direction). ) Continue to rotate in the direction.
[0071]
By the way, when the processing of the sheet S is the “through-pass mode”, the timing gear 55 is rotated without rotating the paddle 23, and the lift lever 64 is moved downward by the rotation. The unit 24 also moves to the discharge roller 26 side and comes into pressure contact with the driven discharge roller 25 in the rotation unit 24. At the same time, the timing gear 55 rotates the discharge roller 26 via the intermediate gear 56a and the transmission gear 56b, and discharges the sheets S to the stacking tray 5 one by one along the second transport path P2.
[0072]
On the other hand, in the “staple mode”, when the trailing edge of the sheet S passes through the endless belt driving roller 19 and the driven roller 17, the paddle 23 is moved in the direction opposite to the sheet conveying direction (the direction opposite to the endless belt driving roller 19). The sheet S is rotated and sent to the processing tray 29 from the second conveyance path P2 along the third conveyance path P3. When the edge of the sheet S reaches the leading edge regulating piece 29b of the processing tray 29, the alignment plate 34 is moved to press the sheet S against the main body side frame 2a. This operation is repeated until a predetermined number of sheets S are stacked, and then the staple unit 3 is operated to perform the staple operation of the sheet bundle on the processing tray 29a. After this post-processing is performed, the timing gear 55 is rotated, and when the elevating lever 64 is moved downward in the figure by this rotation, the rotating unit 24 also moves to the discharge roller 26 side and is driven in the rotating unit 24. The discharge roller 26 is brought into pressure contact with the sheet bundle. At the same time, the timing gear 55 rotates the discharge roller 26 via the intermediate gear 56 a and the transmission gear 56 b to discharge the sheet bundle to the stacking tray 5.
[0073]
Here, drive transmission for selectively driving the paddle 23 will be described.
The lock plate 54c that rotates integrally with the paddle transmission gear 54 that is connected to the paddle drive roller shaft 21a that drives the paddle 23 is normally engaged with a lock claw 57 that can be reciprocally displaced by a solenoid 57b, and stops rotating. In the state, the driven transmission gear 52 is idled by the missing tooth portion 54 b provided in the paddle transmission gear 54. When the engagement between the lock plate 54c and the lock claw 57 is released by driving the solenoid, the driven gear 54 is rotated by the tension of the spring 54d provided on the lock plate 54c, and the driven gear 54 is rotated with this rotation. And the driven transmission gear 52 mesh with each other, and the paddle transmission gear 54 rotates. This rotation stops once the lock plate 54c is engaged with the lock claw 57 in one rotation.
[0074]
In other words, in a state where the lock plate 54c is locked to the lock claw 57, the drive from the driven transmission gear 52 is performed because the chipped portion 54b faces the transmission driven gear 52. 54 does not rotate, and the paddle transmission gear 54 and the paddle 23 connected to the paddle transmission gear 54 are not rotated unless the lock pawl 57 is released from the lock plate 54c.
[0075]
Accordingly, in the “through-pass mode”, the paddle 23 is stopped without releasing the locking between the lock plate 54c and the lock pawl 57, the rotating unit 24 is lowered, and the sheet S is discharged to the stacking tray 5. In the “steple mode”, when the trailing edge of the sheet S passes through the endless belt driving roller 19 and the driven roller 17, the lock claw 57 is released from the lock plate 54 c and the paddle 23 is rotated to rotate the sheet S into the processing tray. 29 can be sent.
[0076]
Next, the timing gear 55 that operates the lifting lever 64 that uses the discharge roller 26 and the rotation unit 24 to move up and down will be described.
[0077]
The timing gear 55 is engaged with a lock claw 59 that is normally reciprocally displaceable by a solenoid 59a and stops the rotation of the timing gear 55. The claw to be locked provided on one surface (surface of FIG. 9) of the timing gear 55. 60, a weight 61 that rotates the timing gear 55 counterclockwise when the engagement between the lock claw 59 and the locked claw 60 is released, and a missing tooth 62 that idles the driven transmission gear 53 and the intermediate gear 56a. , 63 and the timing gear 55 for rotating the rotation unit 24, engages with the tip 64a of the lift lever 64 provided on the other surface (the back surface in FIG. 9), and reciprocates the lift lever 64 along the axial direction. And a cam portion 65. The lift lever 64 always urges the tip 64a in the direction of elastic contact with the cam portion 65 by a spring 66. In the initial state, the tip 64a and the cam portion 65 are engaged with the stopper pin 67 and the long hole 68. Are separated.
[0078]
Next, a post-processing example of the sheet S will be described based on the operation state explanatory diagram of the timing drive gear in FIGS. 11 and 12. As described above, the processing mode of the sheet S includes “steple mode”, “through-pass mode”, and “escape mode”, and the feeding method of the sheet S is different. Will be described.
[0079]
This “steple mode” is a case where stapling is performed as a post-processing, and the number of documents processed by the image forming apparatus main body G is counted at the time of image reading, and the stapling is performed based on the count number and the number of bundles created. In this mode, binding is performed, and the bound sheet bundle is stacked.
[0080]
That is, when the first sheet S in a set is supplied to the receiving port 7, the sheet entrance sensor 11 provided between the receiving port 7 and the conveying roller 15 detects the sheet. Based on the detection result of the sensor, the drive motor 43 starts driving, and the conveyance roller 15, the discharge roller 28, and the endless conveyance belt drive roller 19 rotate via the rotating belt 48 in conjunction with this drive.
[0081]
At this time, the driven transmission gear 52 also rotates. However, the driven gear 54 is not transmitted because the notch teeth 54b face each other, and is in a rotation stopped state. Further, as shown in FIG. 11A, the driven transmission gear 53 also rotates, but the missing tooth portion 62 of the timing gear 55 faces the driven transmission gear 53 and the lock claw 59 and the locking piece 60 are engaged. Thus, the timing gear 55 and the intermediate gear 56a are in a rotation stopped state.
[0082]
Further, the sheet S is conveyed along the first conveyance path P1 in the conveyance guide 8 toward the step by the cooperation of the driven roller 14 and the conveyance driving roller 15 and the cooperation of the driven roller 17 and the endless conveyance belt 18, and the sheet entrance When the sensor 11 detects the trailing edge of the sheet S in the conveying direction and a predetermined time has elapsed, the leading edge of the sheet S is positioned on the stacking tray 5 from the discharge port 10 and the trailing edge of the sheet S is the driven roller 17 and the endless conveying belt 18. Is directed toward the third transport path P3 by the dropping portion 18b of the endless transport belt 18.
[0083]
In this state, in order to permit the rotation of the paddle 23, the solenoid 57b is actuated to release the engagement between the lock plate 54c of the paddle transmission gear 54 and the lock claw 57, and the driven gear 54 starts to rotate by the spring 54d. In conjunction with this rotation, the paddle transmission 54 and the driven transmission gear 52 mesh with each other to rotate the driven gear 54 provided on the paddle drive roller shaft 19a, thereby rotating the paddle 23.
[0084]
The paddle 23 returns the sheet S in the direction opposite to the conveyance direction so far, and sends the sheet S to the sheet placement portion 29 a and the endless conveyance belt 18, and the side edge of the sheet S is the leading edge of the processing sheet 29. It abuts on the restricting piece 29b.
[0085]
Thereafter, the aligning plate driving motor 36 is driven to move the aligning plate 34, and the sheet S is brought into contact with the main body side frame 2a to which the staple unit 3 at a position facing the moving direction of the aligning plate 34 is attached. Thus, the alignment operation of the sheet S is performed.
Then, each operation described above is performed for each conveyance of each sheet S, and when a predetermined number of sheets are stacked, the staple unit 3 is driven to execute staple binding on the sheet S.
[0086]
When this staple binding is executed, the timing gear 55 is allowed to rotate, so that the timing solenoid 59a is actuated to engage the locking claw 59 and the locking piece 60 of the timing gear 55 as shown in FIG. The combination is released and the timing gear 55 is rotated counterclockwise by the gravity of the weight 61.
[0087]
By this rotation, the driven transmission gear 53 comes out of the missing tooth 62 and meshes with the timing gear 55, and the timing gear 55 starts to rotate in earnest upon receiving the drive from the driven transmission gear 53.
[0088]
Further, as shown in FIG. 11C, the tip 64a of the elevating lever 64 positioned on the back side of the timing gear 55 is in elastic contact with the cam portion 65 of the timing gear 55, and the cam 66 has an upward urging force for the spring 66 in the figure. Against this, the elevating lever 64 starts to move downward in the figure. As the elevating lever 64 moves downward, the elevating pin 64b engaged with the slit 24c of the rotating unit 24 also descends, so that the rotating unit 24 also starts to move downward in the figure. (In FIG. 11 and FIG. 12, the slit 24c and the lift pin 64b of the rotating unit are located on the back side of the lift lever 24. However, in FIG. 11 and FIG. .)
[0089]
After the rotation unit 24 starts to move downward, the intermediate gear 56a comes out of the missing tooth 63 of the timing gear 55 and meshes with the timing gear 55, and the intermediate gear 56a and the transmission gear 56b start to rotate. 26 also starts rotating.
[0090]
Next, as shown in FIG. 12A, when the tip 64a of the lift lever 64 comes into elastic contact with the outermost peripheral surface of the cam portion 65 that is substantially equal to the radius of the timing gear 55, the tips of the discharge roller 26 and the rotating unit 24 are obtained. The bundle of sheets S after being stapled is discharged to the stacking tray 5 by niping with the driven discharge roller 25 on the side. The completion of the discharge of the sheet S is detected by the sheet presence / absence sensor 30a when the sensor lever 30 located at the front end of the processing tray 29 shown in FIGS.
[0091]
When the discharge of the bundle of sheets S after stapling to the stacking tray 5 is completed, the elastic contact between the tip 64a of the elevating lever 64 and the cam portion 65 is released as shown in FIG. Starts rotating in the upward return direction and the driven discharge roller 25 is separated from the discharge roller 26, and then the missing tooth portions 62 and 63 of the timing gear 55 are driven and transmitted to the driven transmission gear 53 and the discharge roller 26. It moves to a position where it resists the gear 56a and returns to the state of FIG.
[0092]
Next, the “through-pass mode” will be described.
This mode is a mode in which the sheets S discharged from the image forming apparatus main body G are directly stacked on the stacking tray 5 via the first transport path P1 and the second transport path P2, and the stapling process is not performed. It is suitable for stacking a large amount of sheets S. The difference in operation between this mode and the “steple mode” described above is that the paddle 23 is not always rotated, and that the timing gear 55 starts rotating at an early stage according to the sheet conveyance timing. It is.
[0093]
That is, when the sheet S is supplied to the receiving port 7, the sheet entrance sensor 11 provided between the receiving port 7 and the conveyance roller 15 detects the sheet. Based on the detection result of this sensor, the drive motor 43 starts driving, and the conveyance roller 15, the second discharge roller 28, and the endless conveyance belt drive roller 19 rotate via the rotating belt 48 in conjunction with this drive. . At this time, as shown in FIG. 11A, the driven transmission gear 53 also rotates. However, the chipped portion 62 of the timing gear 55 faces the driven transmission gear 53 and the lock claw 59 and the locking piece 60 are connected. As a result, the timing gear 55 and the intermediate gear 56a are stopped.
[0094]
After the sheet entrance sensor 11 detects the leading edge of the sheet S, the timing solenoid 59a is actuated as shown in FIG. 11B to allow the timing gear 55 to rotate with a slight delay. The engagement of the gear 55 with the locking piece 60 is released, and the timing gear 55 is rotated counterclockwise by the gravity of the weight 61.
[0095]
By this rotation, the driven transmission gear 53 comes out of the missing tooth 62 and meshes with the timing gear 55, and the timing gear 55 starts to rotate in earnest upon receiving the drive from the driven transmission gear 53. Subsequent operations are the same as those in FIGS. 11C to 12A and 12B in the “steple mode”. Therefore, the rotating unit 24 moves up and down each time the sheet S is carried into the main body device 2 and discharges the sheet S to the stacking tray 5. The completion of the discharge of the sheet S is detected by the sheet presence / absence sensor 30a when the sensor lever 30 located at the front end of the processing tray 29 shown in FIGS.
[0096]
In order to prevent the paddle 23 from rotating, the solenoid 57b is not operated during the execution of the “through-pass mode”, and the lock plate 54c of the paddle transmission gear 54 and the lock claw 57 are engaged.
[0097]
Finally, the “escape mode” is a mode in which a special sheet having an irregular size or the like is discharged to the escape tray 6, and the rotary flapper 16 is rotated counterclockwise from the state of FIGS. 2 and 3 from the first transport path P1. And the sheet S is conveyed to the fourth conveying path P4, and the sheet S is discharged to the escape tray 6 by the second discharge roller 28.
[0098]
In this case, the flapper 16 is rotated and positioned so as to guide the sheet S to the fourth conveyance path P4 by setting the “escape mode” in advance. In this state, when the sheet S is supplied from the receiving port 7, the sheet entrance sensor 11 detects the sheet, and the drive motor 43 starts driving. As a result, as described in the other modes, the conveyance roller 15 and the second discharge roller 28 are driven and rotated, and the sheet S is discharged to the escape tray 6.
[0099]
Since the rotation of the paddle 23 and the timing gear 55 is unnecessary, the solenoid 57a that allows the paddle 23 to rotate and the solenoid 59a that allows the rotation of the timing gear 55 do not operate.
[0100]
The sheet S is discharged from the sheet discharge port 10 of the main body apparatus 2 by the operation as described above. The stacking tray 5 for stacking and stacking the discharged sheets S will be described below.
[0101]
As shown in FIGS. 13 (A) and 13 (B), the stacking tray 5 can be moved up and down through a base 69 having a mounting portion 69a that can be attached to and detached from the main unit 2 and a base 69 via a lift control unit 70. The sheet storage portion 71 held by the sheet storage portion, the support bracket 72 fixed to the lower surface of the sheet storage portion 71, and the support bracket are fixed to the upper surface portion of the movable gear 74.
[0102]
The elevation control unit 70 includes an arcuate fixed gear 73 fixed to the base 69, an arcuate movable gear 74 fixed to the support bracket 72, and a planetary gear 75 that meshes with and displaces the gears 73 and 74. The gears 73 and 74 and the planetary gear 75 are connected to each other to provide a shift arm 76 that fixes the relative distance between them, and the upper surface of the base 69 and the bottom surface of the support bracket 72. And a coil spring 77 for urging the spring.
[0103]
Two coil springs 77 are provided across the gears 73 and 74 and the planetary gear 75, and the sheet storage portion 71 is displaced downward according to the weight of the sheets S sequentially stacked on the upper surface of the sheet storage portion 71. The spring constant is set so that the next sheet S can be sequentially stacked on the upper surface of the previous sheet S at a substantially constant height.
[0104]
In addition, when the sheet storage portion 71, which is a sheet support surface, is displaced downward against the bias of the coil spring 77, the movable gears according to changes in the meshing positions of the gears 73 and 74 and the planetary gear 75. The upper surface of the sheet storage portion 71 attached to the upper surface of 74 via the support bracket 72 descends from the upper position in FIG. 13A as the sheet S accumulation amount increases, and is substantially parallel to the lower limit position in FIG. 13B. Move in the state. Therefore, the angle formed between the upper surface of the sheet storage unit 71 and the sheet regulating surface 2c that regulates the edge of the stacked sheets provided in front of the main body device 2 is not substantially changed and is always in a substantially constant state. 71 descends as the sheet accumulation amount increases, and the height difference between the accumulated sheet upper surface and the discharge roller 26 can be set to a substantially constant distance.
[0105]
Further, the upper surface of the sheet storage portion 71 is provided so as to be gradually increased from the position of the sheet regulating surface 2c of the main body device 2 toward the upstream side in the sheet discharging direction so that the accumulated sheets slide down due to its own weight. In addition, the inclination angle is set so that the inclination angle in the vicinity of the sheet regulating surface 2c is different from the inclination angle upstream of the discharge direction.
[0106]
That is, the angle formed between the sheet discharge direction extension line SP defined by the discharge roller 26 and the discharge driven roller and the upper surface of the sheet storage portion 71 is a first support surface 71a having a relatively small angle α, and the angle α. The upper surface support portion of the sheet storage portion 71 is constituted by the second support surface 71b on the sheet regulating surface side set at a larger angle β. Then, the bent portion (angle changing portion to the first support surface 71 a and the second support surface 71 b) 71 c where the angle α and the angle β change is used to support the sheet discharge direction extension line SP and the upper surface of the sheet storage portion 71. It is set closer to the sheet regulating surface 2c than the position where the surface intersects.
[0107]
Therefore, the height difference between the sheet regulating surface 2c and the discharge roller 26 can be set large, and even if the rear end (edge on the sheet regulating surface 2 side) of the sheet S accumulated on the sheet storage portion is curled upward in the drawing. The state in which the leading edge of the sheet S to be discharged subsequently comes into contact with the trailing edge of the already stacked sheets can be reduced, and the leading edge of the discharged sheet S is curled and wound downward. Can be avoided.
[0108]
According to the experiment, when a copy sheet that is normally used in this type of apparatus is used, the angle α formed between the sheet discharge direction extension line SP and the upper surface of the sheet storage portion 71 is about 15 degrees to 23 degrees. It has been found that the angle β should be 25 degrees or more, which is larger than this angle. However, these angles are changed depending on the thickness and material of the sheet to be used, and are not particularly limited to these numerical values of the angles. In short, it is only necessary that the angle β is set larger than the angle α.
[0109]
In the illustrated example, the second support surface 71b is continuously inclined through the first support surface 71a and the bent portion 71c. However, the first support surface 71a and the second support surface 71b are stepped. It may be connected, or it may be a circular arc surface whose angle gradually changes. The point is that the shape may be such that the height difference between the discharge port 10 and the second support surface 71b is larger than when the upper surface of the first support surface 71a is simply extended to the sheet regulating surface 2c side.
[0110]
Further, the apparatus according to the embodiment may place the sheet so as to straddle the processing tray 29 and the sheet storage unit 71, but the sheet on the sheet storage unit side even when the minimum size sheet is mounted. Since the tip is set so as to be located upstream of the bent portion 71c in the discharge direction, in this case, problems due to upper curl, lower curl and the like can be solved.
[0111]
Moreover, the notch part 71d is provided in the staple part side edge part of the 2nd support surface 71b so that FIG. 1 may be seen. This notch portion 71d is a notch for preventing the staple needle portion from rising up significantly even if the sheet bundle into which the staple needle is driven is accumulated and stacked.
[0112]
Further, as already described with reference to FIGS. 2 and 3, the sheet pressing lever 78 that presses the rear end (the edge of the sheet regulating surface 2 c side) of the sheet S from above the second support surface 71 b of the sheet storage portion 71 is provided with a discharge lever. The sheet S is located below the outlet 10 and protrudes and protrudes from the sheet regulating surface 2c side. Even if the sheet is greatly curled on the second support surface, the sheet storage unit 71 is surely placed. It can be accumulated on the surface.
[0113]
The sheet pressing lever 78 rotates about the sheet pressing lever rotation shaft 81 as an axis fulcrum. When the sheet pressing lever 78 is pressing a sheet, the end of the lever is detected by the sheet stacking amount detection sensor 85. If the sensor 85 detects the end of the presser lever 78, it outputs a processing stop signal to the image forming apparatus main body G, assuming that it is positioned at the lower limit position of the sheet storage portion 71.
[0114]
Here, the stacking operation of the sheets S discharged from the main body device 2 will be described with reference to FIGS.
[0115]
First, in the state shown in FIG. 14A, the first discharged sheet S1 is placed on the surface of the sheet storage portion 71, and the edge of the sheet S1 is pressed by the sheet pressing lever 78 on the second sheet support surface 71b. Then, the subsequent discharge sheet S <b> 2 is conveyed along the second conveyance path P <b> 2 and is being discharged through the discharge path by the discharge roller 26. The sheet S2 is discharged on the sheet discharge direction extension line SP. The sheet discharge direction extension line SP intersects the first sheet support surface of the sheet storage portion 71, and this intersection angle is a relatively small angle α. Is set. Therefore, even if the leading edge of the sheet S2 is curled downward, the angle is small, so that the leading edge of the sheet S2 is discharged along the first support surface 71a without being curvedly conveyed to the second sheet supporting surface side. Guided and guided downstream in the direction.
[0116]
Further, the sheet S1 that has been accumulated first is not moved by the sheet S2 because its rear end is pressed against the second support surface 71b by the sheet pressing lever 78.
[0117]
FIG. 14B shows a state in which the trailing edge of the sheet S2 has passed the sensor lever 30, and after a lapse of a predetermined time from the passing signal, the trailing edge of the sheet S2 is discharged from the discharge roller 26. It starts to fall toward the second support surface 71b. At substantially the same time as the discharge, the presser lever solenoid 83 shown in FIG. 2 is operated, and the sheet presser lever 78 is retracted inside the sheet regulating surface 2c as shown in FIG. 14B.
[0118]
After the retraction, the sheet S2 is falling toward the second support surface 71b as shown in FIG. 15A, but the lever solenoid 83 releases the operation with a delay of the drop time. . By this release, the sheet pressing lever 78 is moved to the second support surface side in the direction of the arrow by the return spring 84 to be in the state of FIG. 15B, and the rear end of the sheet S of the sheet S2 (the edge of the sheet regulating surface 2c side) ).
[0119]
As described above, since the angle β formed by the second support surface on the sheet regulating surface 2c side is set larger than the angle α formed by the extension line of the sheet S in the discharge direction and the first support surface, the discharge roller 26 It is possible to set a large difference in height between the second support surface and the second support surface. Further, since the second support surface is pressed from above, jamming of the stacking sheet is eliminated, and stacking performance can be improved.
[0120]
Further, since the operation similar to that for single sheet feeding is performed when the sheets S are discharged, the stackability of the sheet bundle can be improved also in this case. Further, in the stacking tray 5, when the stacking amount of the sheet S increases, the coil spring 77 is compressed, and the uppermost surface of the sheet is maintained at a substantially constant height.
Further, since the sheets are shifted by the alignment plate in the sheet width direction in a state where the sheets are straddling the stacking tray 5 and the processing tray 29, the sheets in the stacking tray 5 are pressed by the sheet pressing lever 78. The alignment state is not disturbed.
[0121]
In the above description of the embodiment, the sheet pressing lever 78 that is moved by the solenoid is provided as the sheet pressing means. However, as shown in FIG. 16, the pressing paddle roller 86 to which an elastic piece made of rubber or the like is attached is used. Depending on the discharge timing, the paddle may be driven and rotated by a motor (not shown) as appropriate, and the paddle may be caused to appear and disappear from the sheet regulating surface 2c. As shown in FIG. 17, the base end portion of the sheet pressing lever 87 is attached to a cam plate 88 that is rotated by a motor (not shown) and the fixed pin 89 fitted into the slit of the sheet pressing lever 87 is linked. As an alternative, the sheet may be pressed.
[0122]
That is, any means may be used as long as the sheet S is retracted only when the sheet S is discharged and dropped from the sheet discharge roller 26 and the sheet S is pressed.
The above description and FIGS. 1 to 17 are descriptions of the first type embodiment. Next, the second type embodiment will be described with reference to FIGS. 18 to 24. In the figure, the same parts as those of the first type are denoted by the same reference numerals, and description thereof is omitted.
Differences between the second type device and the first type device will be schematically described with reference to FIG.
[0123]
First, the escape tray 6 that accommodates a special sheet or the like located above the stacking tray 5 and the fourth transport path P4 leading to the escape tray 6 are eliminated. Accordingly, special sheets and the like are discharged in advance on the image forming apparatus side, and the finisher apparatus 1 as a sheet stacking apparatus is miniaturized.
[0124]
Second, the first type apparatus is in a state where the sheet placement portion side (18c) of the endless conveyance belt 18 for carrying the sheet S into the processing tray 29 along the third conveyance path P3 is in a free state. In the two-type device, the sheet placement portion side (18c) is also supported by a driven pulley.
[0125]
Third, the coil storage 77 is used to move the sheet storage unit 71 of the stacking tray 5 up and down, and this motor is also used to detect the top surface of the sheets stacked and stacked in the sheet storage unit 71. The sheet storage unit 71 is moved up and down by this signal. Further, a sheet flapper 130 is provided on the same axis as the driven discharge roller 25 of the rotating unit 24 so that the sheet discharged from the discharge roller 26 quickly falls into the sheet storage portion.
[0126]
Next, the above points will be described individually.
[0127]
The second type apparatus shown in FIGS. 18 and 19 includes a feeding belt unit 100 that spans an endless conveyance belt 18 as a sheet transfer unit that loads the sheet S into the processing tray 29 along the third conveyance path P3. Yes. The feeding belt unit 100 will be described with reference to FIG. 20 as well. A driving pulley 101 that is attached to the belt driving shaft 19a and rotates together with the driving shaft, and a position on the sheet placement surface 29a side with a predetermined distance from the driving pulley 101. The driven support pulley 102, the support plate 104 provided on both sides of each pulley for maintaining the distance between the drive pulley 101 and the driven support pulley 102, and the drive pulley 101 and the driven support pulley 102. And an endless conveyor belt 18. The support plate 104 rotatably supports the rotation shaft 103 of the driven support pulley 102.
[0128]
Therefore, when the belt drive shaft 19a is driven to rotate, the drive pulley 101 fixed to the belt drive shaft 19a also rotates, and the endless transport belt 18 also moves while rotating the driven support pulley 102.
[0129]
The support plate 104 has an inverted U-shaped attachment portion 106. Since this attachment portion is not fixed to the belt drive shaft 19a, the support plate 104 having the driven support pulley 102 can swing and swing around the belt drive shaft 19a. Further, the support plate 104 is provided with a weight balance 105 on the opposite side of the driven support pulley 102 as shown in FIG. The weight ballast 105 is for bringing the sheet retracting portion 18c of the endless conveying belt 18 on the driven support pulley 102 side into contact with the sheet S with a substantially constant contact force.
[0130]
When the retraction unit 100 having the above configuration is employed, when the number of sheets stacked on the processing tray 29 increases, the sheet retraction portion 18c that is a contact portion with the uppermost sheet of the endless conveyance belt 18 is lifted by the thickness of the sheet S. It is done. That is, the support plate 104 swings around the belt drive shaft 19a. This swinging direction is opposite to the rotational direction A of the belt drive shaft 19a.
[0131]
Since the endless transport belt 18 is backed up by the driven support pulley 102, the endless transport belt 18 swings according to the number of sheets on the sheet placement portion 29a of the processing tray 29, but the number of placed sheets on the processing tray 29 increases. However, the contact area with respect to the sheet S does not change. That is, the conveyance force does not change or become too strong depending on the number of sheets S stacked. Therefore, even if the number of sheets to be placed on the sheet placement portion 29a increases, the sheet S that has abutted against the sheet leading edge regulating piece 29b is not further pressed to buckle the sheet S.
[0132]
Further, the sheet retracting portion 18c of the endless transport belt 18 is disposed at a position overlapping with the alignment plate 34, and is backed up by the driven support pulley 102, similarly to the first type endless transport belt 18. Even when the sheet S is moved in the width direction by the alignment plate 34, the sheets S can be aligned with high accuracy.
[0133]
Although the retraction belt unit 100 is provided with the weight balance 105, the pressing force of the endless conveyance belt 18 to the sheet S can be adjusted by adjusting the rotational moment due to the weight balance 105.
[0134]
However, when the weight on the support plate 104 side is small, the weight balance 105 may not be necessary. Further, instead of the weight balance 105, the pressing force may be adjusted by a spring member or the like.
[0135]
Further, as shown in FIG. 21, the structure of the support plate 104 of the retraction belt unit 100 is simplified, and the driven support pulley 107 is rotatably supported by the wire-like support arm 108, and is opposite to the driven support pulley 107. The reverse U-shaped swing end on the side may be suspended from the belt drive roller shaft 19a.
[0136]
Next, the second type stacking tray 5 will be described with reference to FIG.
[0137]
The stacking tray 5 uses a motor unit 120 including a motor as an elevating mechanism of the sheet storage unit 71. The motor unit 120 is attached to a shift arm 76 that supports the movable gear 74 and the planetary gear 75, and the motor drive shaft 121 from the motor unit 120 is connected to the planetary gear 75. When the motor rotates the motor drive shaft 121 in the clockwise direction, the sheet storage portion 71 rises, and when the motor rotates in the counterclockwise direction, the sheet storage portion 71 descends. Accordingly, the paper surface level of the uppermost sheet stacked and stacked in the sheet storage unit 71 is detected, this signal is sent to the motor unit 120, and the motor is controlled in forward and reverse directions, so that the paper surface level can be kept constant more accurately. It becomes.
[0138]
Here, as shown in FIG. 23, the sheet level detection mechanism described above is configured such that a detection flag 124 provided integrally with a sheet pressing lever 78 that rotates about a shaft fulcrum 81 is provided by transmission type sensors 125a and 125b. Do by detecting. As shown in the figure, the detection flag 124 has a first flag part 124a and a second flag part 124b, and a notch part 124c that does not react to the sensor is provided between the flags.
[0139]
The state of FIG. 23 shows the position where the sheet pressing lever properly presses the sheet S. At this time, the first sensor 125a is blocked by the first flag portion 124a and is “ON”. The second sensor 125b is not detected by the second flag unit 124b and is in the “OFF” state. This state is a position where the sheet storage portion 71 of the stacking tray 5 is appropriately set. From this state, when the sheets S are sequentially discharged to the sheet storage portion 71, the sheet pressing lever 78 reciprocates between the two-dot chain line position and the solid line position in the drawing for each discharge. Each time the sheet S is placed in the sheet storage unit, the detection flag 124 moves in the clockwise direction, the second flag unit 124b is detected by the second sensor 125b and is turned "ON", and one of the first flag units 124a. Is also detected by the first sensor 125a and is turned on. As described above, when both the first sensor 125 a and the second sensor 125 b are “ON”, a signal for lowering the sheet storage portion 71 is output to the stacking tray 5. With this signal, the motor unit 120 rotates the motor drive shaft 121 counterclockwise to lower the sheet storage portion 71 by a predetermined amount.
[0140]
In this way, the uppermost surface of the stacked sheets on the sheet storage unit 71 is always positioned within a certain height range.
[0141]
By the way, the sheet storage unit 71 does not move up and down every time a normal sheet is discharged, and moves down when the uppermost surface of the stacked sheets reaches a predetermined height or more. It eliminates the complexity of operating each time.
[0142]
When the cutout portion 124c is positioned at the first sensor 125a, the first sensor 125a is “OFF”, and the second sensor 125b is also “OFF”, it is assumed that the sheet storage portion 71 is at a position below the predetermined height. When the first sensor 125a is “OFF” and the second sensor “ON”, it is determined that the sheet pressing lever 78 is retracted to the sheet regulating surface 2c side. When the sheet storage unit 71 is located at the lower limit position and both the first sensor 125a and the second sensor 125b are “ON”, it is determined that the sheets in the sheet storage unit 71 are full, and the sheets are stacked. Stop the stack operation.
[0143]
The above is the configuration for detecting the paper surface level of the stacking tray 5 and the like. However, in order to reliably stack sheets on this stacking tray, this type 2 apparatus is held by a rotating unit 24 as shown in FIG. A rotatable sheet flapper 130 is provided on the support shaft 131 of the driven discharge roller 25 to be driven. The sheet flapper 130 moves up and down as the sheet is discharged, so that the rear end of the sheet S is reliably dropped into the sheet storage unit.
[0144]
The operation of the seat flapper 130 will be described with reference to FIG. The action and operation of the sheet pressing lever 78 for pressing the sheet on the sheet storage portion 71 are the same as those described with reference to FIGS. 14 and 15, so that the sheet pressing lever 78 is discharged in cooperation with the sheet pressing lever 78 here. The sheet S will be described focusing on the sheet flapper 130 that drops the sheet S into the sheet storage unit 71.
[0145]
FIG. 24A shows a state in which the rotation unit 24 is positioned at the lowered position and the sheet S2 is discharged on the sheet discharge direction extension line SP by the discharge roller 26 and the discharge driven roller 25. In this state, the sheet flapper 130 is simply suspended from the support shaft 131 of the driven discharge roller 25, so that the sheet is seated by the sheet nip between the discharge roller 26 and the driven discharge roller 25. It is pushed up and discharged. This state continues until the trailing edge of the sheet S2 is out of the sheet nip between the discharge roller 26 and the driven discharge roller 25.
[0146]
When the rear end of the sheet S2 is removed from the sheet nip between the discharge roller 26 and the driven discharge roller 25, the rear end of the sheet S is pushed down by the weight of the sheet flapper 130 as shown in FIG. Fall along. Simultaneously with this fall, the sheet pressing lever 78 rotates clockwise in the direction of the arrow shown in the figure, and presses the rear end of the sheet S2 onto the sheet storage portion 71. Therefore, even if the trailing edge of the sheet S is greatly curled upward on the discharge roller side, the sheet flapper 130 is curled by the downward rotation due to its own weight and collides with the leading edge of the sheet S to be subsequently discharged. This eliminates problems such as jamming.
[0147]
Note that the positional relationship between the sheet pressing lever 78 and the sheet flapper 130 in the sheet width direction (crossing direction with the sheet conveying direction) is that the sheet pressing lever 78 has three positions (see FIG. 1). A plurality of sheet flappers (two in this embodiment) are arranged between the sheet flapper to avoid collision between the sheet pressing lever 78 and the sheet flapper 130. The sheet flapper 130 of this embodiment is configured to push down the rear end of the sheet S by its own weight rotation. However, the movement of the sheet flapper 130 is driven by a driving unit such as a solenoid in accordance with the discharge timing of the sheet S. You may make it drive up and down.
[0148]
As described above, according to the present invention, when stacking discharged sheets, unnecessary contact between the stacked sheets and subsequently discharged sheets, or stacking while curling is performed. , Can be prevented from being placed.
[0149]
In addition, since the trailing edge of the sheet is pressed on the second sheet placing surface having a deeper angle than the first sheet placing surface, the rear end of the sheet is greatly curled toward the sheet discharge port side to block the discharge port, It is possible to prevent the subsequent sheet from being discharged and jamming. Further, since the sheet pressing unit moves from the back side of the sheet edge regulating member below the sheet discharging unit, the pressing unit does not interfere with the discharge of the subsequent sheet. In addition, since the loaded sheet can be pressed for a relatively long time, it is possible to restrict the loaded sheet from being pushed and moved by discharging the subsequent sheet, and the consistency of the stacked sheets is lost. There are few things.
In particular, since the trailing edge of the sheet is pressed on the second sheet placement surface having a deeper angle than the first sheet placement surface, the rear end of the sheet is greatly curled toward the discharge port side to block the discharge port, It is possible to prevent the subsequent sheet from being discharged and jamming. Further, since the sheet pressing unit moves from the back side of the sheet edge regulating member below the sheet discharging unit, the pressing unit does not interfere with the discharge of the subsequent sheet. In addition, since the loaded sheet can be pressed for a relatively long time, it is possible to restrict the loaded sheet from being pushed and moved by discharging the subsequent sheet, and the consistency of the stacked sheets is lost. There are few things. In addition, it is possible to provide a sheet storage device that is small and light as the entire device.
[0150]
Although the invention has been described in some detail with reference to embodiments thereof, the description of the preferred embodiments has been altered in terms of construction details, so that combinations and arrangements of components are intended to be within the spirit of the invention as claimed below. It does not prevent various modifications without departing from the scope.
[0151]
[Brief description of the drawings]
FIG. 1 is a schematic perspective view in which a part of a first type sheet storage apparatus according to an embodiment of the present invention is omitted.
FIG. 2 is a front sectional view schematically showing an internal mechanism in the apparatus of FIG. 1;
FIG. 3 is a partially enlarged view of FIG. 2;
4 is a schematic perspective view showing a part of a temporary sheet stacking tray in the apparatus of FIG. 1. FIG.
5 is a front sectional view schematically showing sheet pressing means on a temporary sheet stacking tray in the apparatus of FIG. 1;
6 is a schematic perspective view illustrating a sheet pressing unit on the sheet stacking tray of FIG.
7 is a schematic front sectional view showing another embodiment of the sheet pressing means of FIG. 5. FIG.
8 is a plan view showing a schematic configuration of a rotation unit in the apparatus of FIG. 1. FIG.
FIG. 9 is a front sectional view schematically showing a drive transmission system in the apparatus of FIG. 1;
10 is a schematic perspective view showing a part of the drive transmission system of FIG. 9;
11 is an operation state explanatory diagram (1) showing an operation state of the drive transmission system of FIG. 9; FIG.
12 is an operation state explanatory diagram (2) showing an operation state of the drive transmission system of FIG. 9; FIG.
FIG. 13 is a front sectional view schematically showing a stacking tray.
FIG. 14 is an operation state explanatory diagram (1) schematically showing a stacking state of sheets stacked on the stacking tray.
FIG. 15 is an operation state explanatory diagram (2) schematically showing a stacking state of sheets stacked on the stacking tray.
16 is a conceptual diagram schematically showing another embodiment of a presser lever for pressing sheets on the stacking tray of FIG. 2; FIG.
17 is a conceptual diagram schematically showing another embodiment of a presser lever for pressing sheets on the stacking tray of FIG. 2; FIG.
18 is a front cross-sectional view schematically showing an internal mechanism of a second type sheet storage device which is another embodiment of FIG. 1; FIG.
19 is a perspective view schematically showing the internal structure of the temporary loading tray with a part of the apparatus shown in FIG. 13 omitted. FIG.
20 is a perspective view schematically showing a feeding belt unit portion of FIG. 18. FIG.
FIG. 21 is a perspective view schematically showing another embodiment of the feeding bell and unit of FIG. 20;
22 is a front sectional view schematically showing a stacking tray attached to FIG. 18. FIG.
23 is a partial cross-sectional view schematically showing a mechanism for detecting the position of a presser lever that presses a sheet onto the stacking tray of the apparatus shown in FIG.
FIG. 24 is an operation state explanatory diagram schematically showing a stacking state of sheets stacked on the stacking tray.
[Explanation of symbols]
G Image forming apparatus
SP sheet discharge direction
1 Finisher device (sheet storage device)
2 Main unit
2c Storage sheet abutment surface (sheet edge regulation means)
5 Stack tray
11 Seat entrance sensor
17 Followed roller
18 Endless conveyor belt (ring-shaped sheet transfer means)
18a Sheet drawer
18b Sheet drop part
18c Sheet retraction part
19 Endless belt drive roller
19a Endless belt drive roller shaft
20 processing tray unit (temporary loading tray unit)
25 Followed discharge roller
26 Discharge roller
26a Discharge roller drive shaft
27 Followed roller
29 Processing tray (temporary loading tray)
29a Sheet placement unit
29b Sheet tip regulating piece (sheet regulating means)
30 Sensor lever
30a Sheet presence / absence detection sensor
31 First sheet presser (first sheet presser)
31a First sheet presser base end
31b First sheet presser tip (sheet contact part)
31c 1st sheet presser rear part
32 Second sheet presser (second sheet presser)
32a Second sheet presser base end
32b Second sheet presser tip
32c Second sheet presser stopper
33 Alignment unit
34 Alignment plate (Alignment means)
39 Rack Gear
40 Support member
40a Support shaft
40b Support piece
40c second support shaft
40d Regulatory Department
40e Spring pin
40g Spring contact part
40f coil spring
70 Elevation controller
71 Sheet storage (sheet support surface)
71a First sheet support surface
71b Second sheet support surface
71c Bent part (angle changing part)
71d Notch
72 Support bracket
73 Fixed gear
74 Movable gear
75 planetary gear
76 Shift arm
77 Coil spring
78 Sheet holding lever (sheet holding means)
81 Seat holding lever rotation axis
82 Connecting lever
83 Presser lever solenoid
84 Return spring
86 Presser paddle roller
87 Link lever
88 cam plate
89 Fixing pin
100 Retraction belt unit (sheet transfer means)
101 Drive pulley
102 Support pulley
103 Support shaft
104 Support plate
105 Weight balance
106 Mounting part
120 Motor unit
121 Motor drive shaft

Claims (3)

A discharge means for discharging the sheet from the discharge port;
A sheet placement surface on which the sheet is placed so as to be inclined toward the downstream side in the discharge direction of the sheet by the discharge means;
A first sheet placement surface for placing the sheet at a first angle formed by the sheet placed on the sheet placement surface and the sheet placed on the sheet placement surface;
An angle changing unit for changing the angle of the sheet placement surface upstream of the position where the first sheet placement surface and the sheet discharged by the discharge means intersect, upstream of the discharge direction;
A second sheet placement surface for placing the sheet rear end portion upstream of the discharge direction of the sheet and having an angle larger than the first angle on the upstream side in the discharge direction from the angle changing unit;
A sheet edge regulating member provided below the discharge means for regulating the movement of the trailing edge of the sheet at the end of the second sheet placement surface, and a retreat position and a retraction position retracted to the back side of the sheet edge regulating member. A sheet pressing means movable between a pressing position for pressing a rear end side of a sheet to be paper pressed against the second sheet placement surface;
Drive means disposed on the back side of the sheet edge regulating member that reciprocates the sheet pressing means between the retracted position and the pressing position below the discharge means each time the sheet is discharged by the discharge means. When,
A sheet flapper means for moving the sheet discharged from the discharging means and dropping the rear end of the discharged sheet toward the second sheet placement surface above the discharging means;
A plurality of the sheet pressing means and the sheet flapper means are provided at intervals in a direction intersecting with the sheet discharge direction, and the sheet storing means is arranged so that the sheet flapper means operates between the strips of the sheet pressing means. apparatus. When the sheet pressing unit moves to a pressing position for pressing the sheet on the second sheet placing surface, the position of the sheet holding unit is detected to detect the amount of the sheet placed on the sheet placing surface. The sheet storage device according to claim 1, further comprising a detection sensor for performing the operation. The sheet storage device according to claim 1, further comprising: a sheet trailing end detection unit positioned upstream of the discharge unit that operates the driving unit of the sheet pressing unit.

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