JP6988677B2 - Paper loading device and image forming system - Google Patents

Description

The present invention relates to a paper loading device for loading paper and an image forming system.

Conventionally, an image forming system including an image forming apparatus for forming an image on paper and a paper loading device for loading the paper on which an image is formed by the image forming apparatus has been proposed.

In order to improve the processing accuracy of the post-processing device that performs post-processing such as staples, punches, and binding, and to facilitate the paper unloading by the user, the paper loading device loads the paper with the same inclination. It is required to be loaded in the section.

As a technique for correcting the inclination of the paper, for example, there is a technique described in Patent Document 1. Patent Document 1 describes a technique for correcting the inclination of paper during transportation of paper. Further, in recent years, after correcting the inclination of the paper, the paper is held by the paper holding unit and loaded on the loading unit.

Japanese Unexamined Patent Publication No. 2017-208628

However, when the paper is held by the paper holding portion after the inclination of the paper is corrected, the transport of the paper is temporarily stopped, so that there is a problem that the productivity is lowered.

In view of the above-mentioned conventional problems, the present invention provides a paper loading device and an image forming system capable of suppressing a decrease in productivity and correcting the inclination of paper for loading. With the goal.

In order to solve the above problems and achieve the object of the present invention, the paper loading device of the present invention controls a paper loading unit on which paper is loaded, a paper detection unit, a pair of correction rollers, and a paper holding unit. It has a department.
The paper detection unit is arranged on the upstream side of the paper loading unit in the paper transport direction, and detects the conveyed paper. The pair of correction rollers are arranged on the upstream side of the paper loading portion in the transport direction to transport the paper and correct the inclination of the paper. The paper holding unit approaches the paper whose inclination has been corrected by the pair of correction rollers from the upstream side in the transport direction, holds the paper in a state where the paper is conveyed by the pair of correction rollers, and loads the paper on the paper loading unit. do. The control unit controls the pair of correction rollers and the paper holding unit based on the detection information detected by the paper detection unit.
The control unit controls the paper transport speed in the pair of correction rollers based on the detection information detected by the paper detection unit, and the transport direction in the paper holding unit based on the transport speed of the pair of correction rollers after the paper tilt correction. Control the speed of movement to.

Further, the image forming system of the present invention includes an image forming apparatus for forming an image on paper and a paper loading device for conveying paper from the image forming apparatus. The above-mentioned paper loading device is applied as the paper loading device.

According to the paper loading device and the image forming system having the above configuration, it is possible to suppress a decrease in productivity and to correct the inclination of the paper for loading.

It is a schematic block diagram of the image formation system which concerns on embodiment of this invention. It is a schematic block diagram which shows the paper loading apparatus which concerns on embodiment of this invention. It is a perspective view which shows the paper loading mechanism of the paper loading apparatus which concerns on embodiment of this invention. It is a top view which shows the paper loading mechanism of the paper loading apparatus which concerns on embodiment of this invention. It is a top view which shows the correction roller of the paper loading apparatus which concerns on embodiment of this invention. It is a block diagram which shows the structure of the control system of the image formation system which concerns on embodiment of this invention. It is explanatory drawing which shows the state which the paper was conveyed to the paper detection part of the paper loading apparatus which concerns on embodiment of this invention. It is a time chart which shows the operation example of the paper loading apparatus which concerns on embodiment of this invention. It is a flowchart which shows the operation example of the paper loading apparatus which concerns on embodiment of this invention. It is explanatory drawing which shows the loading operation to the paper loading part in the paper loading apparatus which concerns on embodiment of this invention. It is explanatory drawing which shows the loading operation to the paper loading part in the paper loading apparatus which concerns on embodiment of this invention.

Hereinafter, embodiments for implementing the paper loading device and the image forming system of the present invention will be described with reference to FIGS. 1 to 11. The common members in each figure are designated by the same reference numerals. Moreover, the present invention is not limited to the following forms.

1. 1. Embodiment 1-1. Configuration of Image Formation System First, the overall configuration of the image formation system according to the embodiment of the present invention (hereinafter referred to as “this example”) will be described. FIG. 1 is a schematic configuration diagram of the image forming system 1 of this example.

As shown in FIG. 1, the image forming system 1 includes an image forming device 10, a paper feeding device 20, and a paper loading device 30. The image forming system 1 is arranged in the order of the paper feeding device 20, the image forming device 10, and the paper loading device 30 from the upstream side of the paper transport path, and is connected in series. The image forming system 1 is capable of transporting paper between the devices and communicating with each other. The image forming system 1 of this example is not limited to the configuration shown in FIG. 1, and is not limited to the configuration shown in FIG. A paper processing device that performs processing such as stapling, punching, and binding may be arranged.

The paper feed device 20 includes a plurality of (three in this example) paper feed trays 21 and can store a large amount of paper. Then, the paper feed device 20 feeds the paper stored in the paper feed tray 21 to the image forming apparatus 10.

The image forming apparatus 10 forms an image on the fed paper. The image forming apparatus 10 includes a plurality of paper feed trays 10a, a transport path 10b, an image forming section 17, a fixing section 10c, an inverted transport path 10d, and an operation display section 14. The operation display unit 14 is installed on the upper part of the image forming apparatus 10. The operation display unit 14 is configured such that a display panel and a touch panel (operation unit) are overlapped with each other, and can be operated by an operator and displayed above.

The plurality of paper feed trays 10a are installed in the lower part of the image forming apparatus 10. Paper fed from any of the plurality of paper feed trays 10a or the paper feed device 20 is conveyed to the transport path 10b. An image forming portion 17 is provided in the middle of the transport path 10b.

The image forming unit 17 includes, for example, an image forming unit of a plurality of colors (cyan, magenta, yellow, black, etc.), and can form a color toner image on paper. A fixing portion 10c on which the paper on which the toner image is formed is conveyed is arranged on the downstream side (simply referred to as “downstream side”) of the image forming unit 17 in the paper conveying direction.

The fixing unit 10c fixes the toner image transferred to the surface side of the paper to the paper by pressurizing and heating the paper to be conveyed. The paper that has been fixed by the fixing unit 10c is conveyed to the paper loading device 30 by the transport path 10b or is conveyed to the reverse transfer path 10d.

An inverted transport path 10d that branches on the downstream side of the fixing portion 10c and joins the transport path 10b on the upstream side of the image forming portion 17 is connected to the transport path 10b. The reversing transfer path 10d is provided with a reversing portion for reversing the paper. Paper whose front and back or front and back are inverted by the reversing portion is conveyed to the transport path 10b on the upstream side of the image forming portion 17 or the transport path 10b on the downstream side of the fixing portion 10c through the reverse transport path 10d. Then, the paper discharged from the transport path 10b of the image forming apparatus 10 is conveyed to the paper loading device 30.

1-2. Configuration Example of Paper Loading Device 30 Next, the configuration of the paper loading device 30 will be described with reference to FIGS. 2 to 4.
FIG. 2 is a schematic configuration diagram showing a paper loading device 30.
Hereinafter, the direction in which the paper is conveyed from the image forming apparatus 10 is defined as the conveying direction X, and the direction orthogonal to the conveying direction X and also orthogonal to the vertical direction is defined as the width direction Y. Then, the direction orthogonal to the transport direction X and the width direction Y is defined as the vertical direction Z.

As shown in FIGS. 1 and 2, the paper loading device 30 includes a paper detecting unit 34, a plurality of transport rollers 35, a paper loading mechanism 37, a paper loading portion 38, and a transport path 39. There is. The transport path 39 transports the paper conveyed from the image forming apparatus 10 to the paper loading mechanism 37 and the paper loading unit 38. Further, a plurality of transport rollers 35 and a paper detection unit 34 are arranged in the transport path 39.

The paper detection unit 34 has a first tilt detection sensor 34a and a second tilt detection sensor 34b (see FIG. 6). The first tilt detection sensor 34a and the second tilt detection sensor 34b are arranged on the upstream side in the transport direction X with respect to the correction rollers 51A and 51B of the paper loading mechanism 37 described later. Further, the first tilt detection sensor 34a and the second tilt detection sensor 34b are arranged at intervals in the width direction Y (see FIG. 7). Then, the first tilt detection sensor 34a and the second tilt detection sensor 34b detect the tip of the conveyed paper S in the conveying direction X.

Further, the paper detection unit 34 is arranged between the transport roller 35 arranged at the most downstream of the transport direction X in the plurality of transport rollers 35 and the pair of correction rollers 51A and 51B provided in the paper loading mechanism 37 described later. To.

In this example, an example in which the paper detection unit 34 is arranged on the upstream side of the transport direction X with respect to the correction rollers 51A and 51B has been described, but the present invention is not limited to this, and the paper detection unit 34 is arranged on the correction roller 51A. , 51B may be arranged on the downstream side of the transport direction X. Further, the paper detection unit 34 is not limited to the example of detecting the front end of the transport direction X in the conveyed paper S, and may detect the rear end of the transport direction X in the paper S.

[Paper loading section]
The paper loading unit 38 has a loading tray 38a and an elevating mechanism (not shown) that moves the loading tray 38a up and down in the vertical direction Z. The paper S conveyed by the paper loading mechanism 37 is loaded on the loading tray 38a. A paper loading mechanism 37 is arranged on the upstream side of the paper loading unit 38 in the transport direction X.

[Paper loading mechanism]
FIG. 3 is a perspective view showing the paper loading mechanism 37, and FIG. 4 is a plan view showing the paper loading mechanism 37.
As shown in FIGS. 3 and 4, the paper loading mechanism 37 includes a loading / transporting unit 41, a housing 42, and a widthwise moving mechanism 43. The housing 42 is formed in a hollow rectangular parallelepiped shape. The loading and unloading unit 41 is housed in the housing 42 via the widthwise moving mechanism 43. The housing 42 has an end portion on the downstream side in the transport direction X of the paper S loaded on the paper loading portion 38, that is, a contact surface 42a with which the rear end abuts. The contact surface 42a faces the paper loading portion 38. Further, the contact surface 42a is formed with an opening facing the correction rollers 51A and 51B and the paper holding portions 52 and 52 provided in the loading and transporting unit 41 described later.

The width direction moving mechanism 43 supports the load transfer unit 41 on the housing 42 so as to be movable in the width direction Y. The width direction moving mechanism 43 has a guide shaft 43a and a moving driving unit 43b. Both ends of the guide shaft 43a in the width direction Y are fixed to the housing 42. The guide shaft 43a penetrates the load transfer unit 41 along the width direction Y and supports the load transfer unit 41 so as to be movable in the width direction Y. Then, when the movement drive unit 43b is driven, the load transfer unit 41 moves in the width direction Y along the guide shaft 43a.

[Loading and transporting unit]
The load transfer unit 41 has a pair of correction rollers 51A and 51B, two paper holding units 52 and 52, and two roller driving units 53A and 53B (see FIG. 5). The pair of correction rollers 51A and 51B are arranged at the corners of the upper end portion of the loading and transporting unit 41 in the vertical direction Z and the end portion on the downstream side in the transporting direction X. The pair of correction rollers 51A and 51B are arranged immediately before the upstream side of the transport direction X in the paper loading section 38. Further, no other rollers are arranged on the downstream side of the transport direction X from the pair of correction rollers 51A and 51B, and the pair of correction rollers 51A and 51B are arranged on the most downstream side on the transport path 39. It is a transport roller.

As described above, the first tilt detection sensor 34a and the second tilt detection sensor 34b constituting the paper detection unit 34 are arranged on the upstream side of the pair of correction rollers 51A and 51B in the transport direction X (FIG. 2). As described above, the paper detection unit 34 is arranged between the transfer roller 35 arranged at the most downstream of the transfer direction X in the plurality of transfer rollers 35 and the pair of correction rollers 51A and 51B. That is, no other transfer roller 35 is arranged between the pair of correction rollers 51A and 51B and the first tilt detection sensor 34a and the second tilt detection sensor 34b. Further, the pair of correction rollers 51A and 51B each have a driven roller 51c facing each other in the vertical direction Z.

FIG. 5 is a plan view showing the correction rollers 51A and 51B.
The first correction roller 51A and the second correction roller 51B are arranged at intervals in the width direction Y. The first correction roller 51A is connected to the drive shaft of the first roller drive unit 53A via the first drive belt 54A. The first correction roller 51A is rotationally driven by the first roller drive unit 53A. Further, the second correction roller 51B is connected to the drive shaft of the second roller drive unit 53B via the second drive belt 54B. The second correction roller 51B is rotationally driven by the second roller drive unit 53B.

Further, the first roller drive unit 53A and the second roller drive unit 53B are connected to a CPU 31 (see FIG. 6) showing an example of a control unit described later, and are individually controlled. Therefore, the rotation speeds of the first correction roller 51A and the second correction roller 51B, that is, the so-called paper transport speed, are configured to be individually controllable. Then, the CPU 31 corrects the inclination of the conveyed paper S by controlling the conveying speeds of the first correction roller 51A and the second correction roller 51B.

[Paper holder]
As shown in FIGS. 3 and 4, the two paper holding portions 52, 52 are arranged outside the pair of correction rollers 51A, 51B in the width direction Y. Further, the two paper holding portions 52 and 52 have the same configuration, respectively. The paper holding portion 52 has a gripper member 61 and a gripper moving mechanism 62.

The gripper member 61 has a lower gripper 81 and an upper gripper 82. The upper gripper 82 is rotatably supported by the lower gripper 81 via a rotation shaft 85. The end of the upper gripper 82 on the downstream side in the transport direction X approaches and separates from the lower gripper 81. Then, the end of the upper gripper 82 approaches the lower gripper 81 to hold the conveyed paper S. The lower gripper 81 is movably supported by the gripper moving mechanism 62.

The gripper moving mechanism 62 includes a gripper drive unit 71 (see FIG. 6), a drive roller, a plurality of rollers, and a drive belt 74 formed in an endless manner. The drive belt 74 is wound around a drive roller and a plurality of rollers. Then, when the gripper drive unit 71 is driven, the drive belt 74 rotates along the drive roller and the plurality of rollers.

Further, the gripper member 61 connected to the drive belt 74 moves in the transport direction X and the vertical direction Z with the rotational operation of the drive belt 74. By moving the gripper member 61 in the vertical direction Z, the gripper member 61 can move from below the vertical direction Z of the transport path 39 through which the paper S passes to the transport path 39.

Further, the paper holding portions 52 and 52 for holding the paper S and the correction rollers 51A and 51B for correcting the inclination of the paper S are provided on one member of the loading and unloading unit 41. Further, as described above, the loading / transporting unit 41 is movably supported in the width direction Y by the width direction moving mechanism 43. As a result, the paper holding portions 52 and 52 and the correction rollers 51A and 51B can be simultaneously moved in the width direction Y.

In this example, an example in which the two paper holding portions 52 and 52 are arranged outside the correction rollers 51A and 51B in the width direction Y has been described, but the present invention is not limited thereto. The two paper holding portions 52, 52 may be arranged between the first correction roller 51A and the second correction roller 51B in the width direction Y.

1-3. Configuration Example of Control System Next, a configuration example of the control system of the image forming system 1 will be described with reference to FIG.
FIG. 6 is a block diagram showing a configuration of a control system of each device included in the image forming system 1.

As shown in FIG. 6, in the image forming system 1, each device is connected to the client terminal 50 via the network N. For example, a personal computer is applied to the client terminal 50. The client terminal 50 generates image data for image formation by a document creation or image formation application based on a user's input operation. Further, the client terminal 50 has a function of generating an image forming job including image forming setting information (also referred to as “job ticket”) and image data and outputting the image forming job to the image forming apparatus 10.

The image forming apparatus 10 receives the image forming job output from the client terminal 50 via the network N, forms an image on paper based on the image forming setting and the image forming data of the image forming job, and outputs the image (hereinafter,). , "Image formation processing"). The image forming apparatus 10 may be a multifunction device (MFP: Multi-Function Peripheral) having a plurality of types of functions (image forming function, copying function, scanning function, etc.).

The image forming apparatus 10 includes a CPU 11, a memory 12, an auxiliary storage device 13, an operation display unit 14, a submitted data processing unit 15, a RIP processing unit 16, an image forming unit 17, and a communication I / F 18 that constitute a control unit. Each part is connected to each other so as to be able to communicate with each other via a system bus.

The CPU 11 (Central Processing Unit) is a central processing unit that controls the operation of each part of the image forming apparatus 10 and performs arithmetic processing. The CPU 11 reads the program code of the software that realizes each function according to the present embodiment from the auxiliary storage device 13 and executes it. The image forming apparatus 10 may be provided with a processing apparatus such as an MPU instead of the CPU 11.

The memory 12 is a main storage device, and variables, parameters, and the like generated during arithmetic processing are temporarily written in the memory 12. For example, a RAM (Random Access Memory) or the like is applied to the memory 12.

The auxiliary storage device 13 is a storage device that plays an auxiliary role of the memory 12. The auxiliary storage device 13 usually has a mechanism capable of storing data for a long time. In the auxiliary storage device 13, in addition to the OS and various parameters, a program for operating the image forming device 10 is recorded.

The operation display unit 14 is configured by stacking a touch panel, which is an operation unit, on a flat panel display, which is a display unit. The operation display unit 14 generates an operation signal according to the content of the operation input from the user, and supplies the generated operation signal to the CPU 11. Further, the operation display unit 14 displays the processing result of the CPU 11.

The submitted data processing unit 15 analyzes the image forming job input to the image forming apparatus 10 and processes the submitted image forming data. Each image formation data processed by the submitted data processing unit 15 is supplied to the RIP processing unit 16.

The RIP processing unit 16 reflects the image formation setting in the image formation data, converts it into a language (PDL: Page Description Language) that can be identified by the image formation device 10, and outputs it (RIP processing). Languages that can be identified by the image forming apparatus 10 include PCL, PostScript, and the like.

The image forming unit 17 forms an image on paper based on the RIP-processed image forming data output from the RIP processing unit 16. The image forming unit 17 is configured as a printer engine.

For the communication I / F18, for example, a NIC (Network Interface Card) or the like is used, and various data can be transmitted / received between the devices via the network N.

A controller including a trafficking data processing unit 15 and a RIP processing unit 16 may be connected to the network N. Then, the image forming data processed by the submitted data processing unit 15 and the RIP processing unit are input to the image forming apparatus 10 and the paper loading apparatus 30, respectively.

The paper loading device 30 receives image forming data from the image forming apparatus 10 and determines the size and basis weight of the paper to be conveyed, and the presence or absence of post-processing such as staples, punches, and binding.

The paper loading device 30 includes a CPU 31, a memory 32, an auxiliary storage device 33, a paper detection unit 34, a communication I / F 36, a paper loading mechanism 37, and the like. Each part is connected to each other so as to be able to communicate with each other via a system bus.

The CPU 31 showing an example of the control unit is a central processing unit that controls the operation of each unit of the paper loading device 30 and performs arithmetic processing. The CPU 31 reads out the program code of the software that realizes each function according to the present embodiment from the auxiliary storage device 33 and executes it. The paper loading device 30 may be provided with a processing device such as an MPU instead of the CPU 31.

The memory 32 is a main storage device, and variables, parameters, and the like generated during arithmetic processing are temporarily written in the memory 32. For example, a RAM (Random Access Memory) or the like is applied to the memory 32.

The auxiliary storage device 33 is a storage device that plays an auxiliary role of the memory 32. The auxiliary storage device 33 usually has a mechanism capable of storing data for a long time. In addition to the OS and various parameters, the auxiliary storage device 33 records a program for operating the paper loading device 30.

The paper detection unit 34 has a first tilt detection sensor 34a and a second tilt detection sensor 34b. Then, the first tilt detection sensor 34a and the second tilt detection sensor 34b detect the tip of the paper S transported to the transport path 39. Then, the first tilt detection sensor 34a and the second tilt detection sensor 34b output the detected detection information to the CPU 31. The CPU 31 detects the tilt of the conveyed paper S from the timing when the first tilt detection sensor 34a and the second tilt detection sensor 34b detect the tip of the paper S.

The paper loading mechanism 37 has a first roller drive unit 53A that rotationally drives the first correction roller 51A, a second roller drive unit 53B that rotationally drives the second correction roller 51B, and a paper holding unit 52. .. The first roller drive unit 53A rotationally drives the first correction roller 51A based on the drive signal from the CPU 31, and the second roller drive unit 53B rotationally drives the second correction roller 51B based on the drive signal from the CPU 31. Let me.

The paper holding unit 52 drives the gripper drive 71 unit of the gripper moving mechanism 62 based on the drive signal from the CPU 31. As a result, the gripper member 61 of the paper holding portion 52 performs a holding operation of the paper S, a loading operation of the paper, and the like.

For the communication I / F 36, for example, a NIC (Network Interface Card) or the like is used, and various data can be transmitted / received between the devices via the network N.

2. 2. Operation Example of Paper Loading Device Next, an example of the tilt correction operation and loading operation of the paper S by the paper loading device 30 having the above-described configuration will be described with reference to FIGS. 7 to 11.
FIG. 7 is an explanatory diagram showing a state in which the paper S is conveyed to the first tilt detection sensor 34a and the second tilt detection sensor 34b, which are the paper detection units 34. 8 is a time chart showing the operation of the paper loading device 30, and FIG. 9 is a flowchart showing the operation of the paper loading device 30. 10 and 11 are explanatory views showing a loading operation on the paper loading unit 38.

First, as shown in FIG. 9, the paper S is started to pass through the transport path 39 of the paper loading device 30. Then, as shown in FIG. 7, it is determined whether or not the first tilt detection sensor 34a has detected the tip of the paper S (step S11). In the process of step S11, when the CPU 31 determines that the first tilt detection sensor 34a has detected the tip of the paper S (YES determination in step S11), the CPU 31 has the second tilt detection sensor 34b to detect the tip of the paper S. It is determined whether or not it has been detected (step S12).

Further, in the process of step S11, when the CPU 31 determines that the first tilt detection sensor 34a has not detected the tip of the paper S (NO determination in step S11), the CPU 31 has the second tilt detection sensor 34b for the paper. It is determined whether or not the tip of S has been detected (step S13). In the process of step S13, when the CPU 31 determines that the second tilt detection sensor 34b has detected the tip of the paper S (YES determination in step S13), the CPU 31 has the first tilt detection sensor 34a press the tip of the paper S. It is determined whether or not it has been detected (step S14).

If the CPU 31 determines in the process of step S13 that the second tilt detection sensor 34b has not detected the tip of the paper S (NO determination in step S13), the CPU 31 returns to the process of step S11.

In the process of step S12, when the CPU 31 determines that the second tilt detection sensor 34b has detected the tip of the paper S (YES determination in step S12), the first tilt detection sensor 34a side in the width direction Y of the paper S is conveyed. It can be seen that it is tilted to the downstream side of the direction X. _{Then, the CPU 31 calculates a time difference t 1} (see FIG. 8) which is a difference value between the time when the first tilt detection sensor 34a detects the paper S and the time when the second tilt detection sensor 34b detects the paper S (see FIG. 8). Step S15). CPU31 calculates the inclination of the sheet S from the computed time difference _{t 1.}

Further, in the process of step S14, when the CPU 31 determines that the first tilt detection sensor 34a has detected the tip of the paper S (YES determination in step S14), the second tilt detection sensor 34b in the width direction Y of the paper S It can be seen that the side is tilted to the downstream side of the transport direction X. Then, the CPU 31 calculates a time difference, which is a difference value of the time from the detection of the paper S by the second tilt detection sensor 34b to the detection of the paper S by the first tilt detection sensor 34a (step S20).

Further, as shown in FIG. 8, the rotation speed of the first correction roller 51A and the second correction roller 51B, that is, the transport speed of the paper S, is determined by either the first tilt detection sensor 34a or the second tilt detection sensor 34b. It is set to a speed V ₂ until it detects a S.

When the paper S is detected by the first tilt detection sensor 34a in the process of step S11, the CPU 31 controls the first roller drive unit 53A and the second roller drive unit 53B, depending on the size of the paper S and the paper passing interval of the paper S. Paper S is passed only in the pre-correction adjustment area 101 (see FIG. 8) (step S16). Further, when the paper S is detected by the second tilt detection sensor 34b in step S13, the CPU 31 controls the first roller drive unit 53A and the second roller drive unit 53B, and passes the paper S only in the pre-correction adjustment area 101. (Step S21).

When the paper S is passed only in the pre-correction adjustment area 101 by the process of step S16, the CPU 31 controls the first roller drive unit 53A to reduce the rotation speed of the first correction roller 51A, that is, the deceleration of the transport speed of the paper S. Start (step S17). As a result, as shown in FIG. 8, the transport speed of the paper S by the first correction roller 51A is decelerated _{from the speed V 2} to the speed V ₁ via the deceleration region 102.

Incidentally, when the conveying speed of the sheet S by the first correction roller 51A is decelerated to the velocity _{V 1,} CPU 31 maintains the transport speed of the first correction roller 51A to the state of the speed _{V 1.} Then, as shown in FIG. 8, the first correction roller 51A is driven at the _{speed V 1 by the time difference t 1 calculated in step S15.} The region driven by this speed V ₁ is the uncorrected low speed region 104 of the first correction roller 51A.

The processing is passed only sheet S before correction adjusting region 101 by a step S16, further by a time difference _{t 1} calculated in step S15, thereby passed the sheet S (step S18). In the process of step S18, as shown in FIG. 8, the second correction roller 51B is a high speed region 103 in which the conveying speed is fast velocity V ₂ state than the speed V _1. In the high speed region 103 by the second correction roller 51B, the first correction roller 51A is the deceleration region 102. The inclination of the paper S is corrected by the speed difference between the transport speeds of the first correction roller 51A and the second correction roller 51B.

Then, when the time difference t ₁ in the process of step S18 elapses, that is, when the high speed region 103 of the second correction roller 51B elapses, the CPU 31 controls the second roller drive unit 53B and the rotation speed of the second correction roller 51B. That is, deceleration of the transport speed of the paper S is started (step S19). As a result, as shown in FIG. 8, the transport speed of the paper S by the second correction roller 51B is decelerated _{from the speed V 2} to the speed V ₁ via the deceleration region 102.

Further, when the paper S is passed only in the pre-correction adjustment area 101 by the process of step S21, the CPU 31 controls the second roller drive unit 53B, and the rotation speed of the second correction roller 51B, that is, the transport speed of the paper S. Deceleration is started (step S22). As a result, the transport speed of the paper S by the second correction roller 51B is decelerated _{from the speed V 2} to the speed V _1.

The processing is passed only sheet S before correction adjusting region 101 by a step S21, further by a time difference _{t 1} calculated in step S20, thereby passed the sheet S (step S23). In the process of step S23, the transport speed of the paper S by the first correction roller 51A is maintained at a speed V _{2 higher than the speed V 1.} As a result, the inclination of the paper S is corrected.

Then, when the time difference t ₁ in the process of step S23 elapses, the CPU 31 controls the first roller drive unit 53A and starts deceleration of the rotation speed of the first correction roller 51A, that is, the transfer speed of the paper S (step). S24). As a result, the transport speed of the paper S by the first correction roller 51A is reduced _{from the speed V 2} to the speed V _1.

In the processing of step S19 or step S24 and the first correction roller 51A when the conveying speed of the second correction roller 51B is decelerated to the velocity _{V 1,} CPU 31 causes the fed sheet S only preliminary correction region 106. The maximum amount of tilt correction of the paper S is from the pre-correction adjustment area 101 to the preliminary correction area 106.

When the process of step S19 or step S24 is completed, CPU 31 is a conveying speed of the first correction roller 51A and the second correction roller 51B is controlled by the state of the speed _{V 1,} to fed the paper S by the correction after adjusting region 105 (Step S25).

Then, CPU 31, when a predetermined time _{t 4} either from the detection of the sheet S in the first tilt detection sensor 34a and the second tilt detection sensor 34b has elapsed, controls the gripper driving portion 71, the gripper member 61 Movement, that is, acceleration is started (step S27). Then, as shown in FIG. 8, the moving speed of the conveying direction X in the gripper member 61 is accelerated to the speed V _2. As a result, the gripper member 61 approaches the paper S conveyed by the first correction roller 51A and the second correction roller 51B from the rear side of the transfer direction X, that is, from the upstream side.

Further, when the corrected low speed region 107 shown in FIG. 8 elapses, the CPU 31 controls the first roller drive unit 53A and the second roller drive unit 53B to reduce the transfer speed of the first correction roller 51A and the second correction roller 51B. Accelerate from V ₁ to V ₂ (step S28).

Next, as shown in FIG. 10B, the gripper member 61 catches up with the paper S conveyed by the first correction roller 51A and the second correction roller 51B. Then, the gripper member 61 rotates the upper gripper 82 and holds the end portion of the paper S by the upper gripper 82 and the lower gripper 81 (step S29).

Next, as shown in FIGS. 11A and 11B, the CPU 31 controls the gripper moving mechanism 62 to move the gripper member 61 downward in the vertical direction Z, and conveys the paper S to the paper loading unit 38. Paper S is loaded on the loading tray 38a.

Here, as shown in FIG. 8, the first correction roller 51A and the second correction roller 51B convey the paper S _{at the speed V 1} in the corrected low speed region 107 which is conveyed at the _{speed V 1 after the corrected adjustment region 105 has elapsed.} To transport. Then, when the corrected low speed region 107 elapses, the first correction roller 51A and the second correction roller 51B are accelerated _{from the speed V 1} to the speed V ₂ via the acceleration region 108.

Further, the gripper member 61, through the gripper side acceleration region 110, the moving speed of the conveying direction X is accelerated to a speed V ₂ from the stop state (0). Then, _{when accelerated to the speed V 2} , the gripper member 61 moves along the transport direction X at _{the speed V 2.} The regions that move at this speed V ₂ are the gripper-side high-speed regions 111 and 120.

Here, the integrated value of the corrected low-speed region 107 and the integrated value of the acceleration region 108, that is, the sum of the distances for transporting the paper S in the first correction roller 51A and the second correction roller 51B is the gripper shown in FIG. It matches the sum of the integrated values (moving distance in the transport direction X) of the gripper side acceleration region 110 and the first gripper side high speed region 111 in the member 61. Further, the moving speed of the gripper member 61 is the integral of the second gripper side high-speed region 120 to the value obtained by adding the integrated value (moving distance in the transport direction X) of the gripper side acceleration region 110 and the first gripper side high-speed region 111. It is set from the value obtained by adding the value.

Here, as shown in FIG. 10A, the standby position of the gripper member 61 is located behind the paper S to be conveyed. Therefore, in order for the gripper member 61 to catch up with the conveyed paper S, it is necessary to consider the standby position of the gripper member 61 and the distance to the paper S when the gripper member 61 starts moving. The integrated value of the second gripper side high-speed region 120 is a value set in consideration of the distance between the gripper member 61 and the paper S, and is a value indicating the amount of movement of the gripper member 61 to catch up with the paper S. be.

That is, the CPU 31 sets the moving speed of the gripper member 61 in the transport direction X based on the transport speed of the first correction roller 51A and the second correction roller 51B after the correction operation is completed.

As a result, the paper S can be held by the gripper member 61 without stopping the transport of the paper S in the first correction roller 51A and the second correction roller 51B. As a result, since the transport operation of the paper S does not stop, it is possible to suppress a decrease in productivity.

The moving speed of the conveying direction X when the gripper member 61 holds the sheet S is set to the same speed V ₂ and the conveying speed V ₂ for conveying the sheet S in the first correction roller 51A and the second correction roller 51B Has been done. As a result, it is possible to prevent wrinkles from being generated on the paper S due to the speed difference when the gripper member 61 holds the paper S.

Further, the sheet stacking apparatus 30 of the present embodiment, as shown in the process of step 28, and the conveying speed of the sheet S is again accelerated to the speed V ₂ of the first correction roller 51A and the second correction roller 51B after the correction .. As a result, the transport speed of the paper S can be increased, and the productivity can be improved. The transport speed of the paper S in the corrected first correction roller 51A and the second correction roller 51B is not limited to the example of accelerating to the speed V2, and the corrected first correction roller 51A and the second correction roller are not limited to the example. The transport speed of the paper S in 51B does not have to be accelerated.

In the above-mentioned example, an example in which the pre-correction adjustment area 101 and the post-correction adjustment area 105 are provided in step S16, step S21, and step S25 has been described, but the present invention is not limited to this, and the pre-correction adjustment area is not limited thereto. 101, the corrected adjustment area 105 may not be provided. Then, an example has been described in which either moves the gripper member 61 after a predetermined time t ₄ has passed from the detection of the sheet S in the first tilt detection sensor 34a and the second tilt detection sensor 34b, to Not limited. The timing for starting the movement of the gripper member 61, the inclination of the paper first inclination detection sensor 34a and the second tilt detection sensor 34b detects, i.e. may be varied according to the time difference t ₁ of the detection.

For example, the gripper member 61 is started to move after the tilt correction of the paper S by the first correction roller 51A and the second correction roller 51B is completed without providing the corrected adjustment area 105 and the preliminary correction area 106. In the example shown in FIG. 8, the movement of the gripper member 61 may be started after the deceleration region 102 of the second correction roller 51B is completed.

In the above, examples of embodiments of the paper loading device and the image forming system have been described, including their effects. However, the paper loading device and the image forming system of the present invention are not limited to the above-described embodiment, and various modifications can be made without departing from the gist of the invention described in the claims. be.

In the above-described embodiment, a color image is formed by using four sets of image forming units, but the image forming apparatus according to the present invention forms a monochromatic image by using one image forming unit. It may be configured. Further, the image forming apparatus is not limited to a copying machine, but may be a printer, a facsimile, or a multifunction device having a plurality of functions.

Further, in the above-described embodiment, the example in which the paper loading mechanism 37 is controlled by the CPU 31 of the paper loading device 30 has been described, but the present invention is not limited to this, and for example, the CPU 11 of the image forming apparatus 10 has been used. The paper loading mechanism 37 may be controlled.

Although words such as "parallel" and "orthogonal" are used in the present specification, these do not mean only strict "parallel" and "orthogonal", but include "parallel" and "orthogonal". Further, it may be in a "substantially parallel" or "substantially orthogonal" state within a range in which the function can be exhibited.

1 ... Image forming system, 10 ... Image forming device, 11 ... CPU (control unit), 30 ... Paper loading device, 31 ... CPU (control unit), 34 ... Paper detection unit, 34a ... First tilt detection sensor, 34b ... 2nd tilt detection sensor, 35 ... transport roller, 37 ... paper loading mechanism, 38 ... paper loading section, 38a ... loading tray, 39 ... transport path, 41 ... loading transport unit, 42 ... housing, 42a ... contact surface, 51A ... 1st correction roller, 51B ... 2nd correction roller, 52 ... Paper holding unit, 53A ... 1st roller drive unit, 53B ... 2nd roller drive unit, 61 ... Gripper member, 62 ... Gripper moving mechanism, 6, 74 … Drive belt, 75… Guide rail, 77… Connecting member, 81… Lower gripper, 82… Upper gripper

Claims (7)

The paper loading section where the paper is loaded and the paper loading section
A paper detection unit that is arranged on the upstream side of the paper loading unit in the transport direction of the paper and detects the transported paper, and a paper detection unit.
A pair of correction rollers arranged on the upstream side of the paper loading portion in the transport direction, transporting the paper, and correcting the inclination of the paper.
The paper is approached from the upstream side in the transport direction with respect to the paper whose inclination has been corrected by the pair of correction rollers, and the paper is held in a state where the paper is conveyed by the pair of correction rollers to hold the paper loading unit. The paper holder to be loaded on the
A control unit for controlling the pair of correction rollers and the paper holding unit based on the detection information detected by the paper detecting unit is provided.
The control unit controls the transport speed of the paper in the pair of correction rollers based on the detection information detected by the paper detection unit, and is based on the transport speed of the pair of correction rollers after the tilt correction of the paper. A paper loading device that controls the moving speed of the paper holding unit in the transport direction. The paper loading device according to claim 1, wherein the control unit starts the movement of the paper holding unit in the transport direction based on the timing at which the paper detecting unit detects the paper. The paper detection unit includes a first tilt detection sensor and a second tilt detection sensor arranged at intervals in a width direction orthogonal to the paper transport direction.
The control unit calculates the difference between the time when the first tilt detection sensor detects the paper and the time when the second tilt detection sensor detects the paper, and the pair of correction rollers are based on the calculated time difference. The paper loading device according to claim 1 or 2, which controls the transport speed of the above. The control unit sets the integrated value of the transport speeds of the pair of correction rollers after the paper tilt correction as the distance from the standby position of the paper holding unit to the paper when the paper holding unit starts moving. The paper loading device according to any one of claims 1 to 3, wherein the moving speed of the paper holding unit is set from the added value. One of claims 1 to 4, wherein the control unit controls the moving speed of the paper holding unit and the transport speed of the pair of correction rollers to the same speed when the paper holding unit holds the paper. The paper loading device described in. The control unit decelerates the pair of correction rollers based on the detection information detected by the paper detection unit, and accelerates the pair of correction rollers after correcting the inclination of the paper. Any one of claims 1 to 5. The paper loading device described in. An image forming device that forms an image on paper,
A paper loading device for transporting the paper from the image forming apparatus is provided.
The paper loading device is an image forming system to which the paper loading device according to any one of claims 1 to 6 is applied.

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