Intermediate conveyance device, post-processing device, and image forming system

Abstract

To enhance productivity.SOLUTION: A relay conveyance device that relays a plurality of recording media to a post-processing device that performs post-processing on the plurality of recording media includes: a first reversion part that reverses a first recording medium among the plurality of recording media conveyed from a preceding device; a second reversion part for reversing a second recording medium different from the first recording medium; and a confluence conveyance part that overlaps the first recording medium reversed by the first reversion part and the second recording medium reversed by the second reversion part and conveys them to the post-processing device.SELECTED DRAWING: Figure 25

Description

[Technical field]

[0001] The present invention relates to an intermediary conveyance device, a post-processing device, and an image forming system. [Background technology]

[0002] There is known a post-processing device that performs a predetermined post-processing after forming an image on a sheet-like recording medium. There is also known a relay conveying device (sometimes called a "relay machine") that relays the recording medium when conveying it from the image forming device to the post-processing device. There is also known an image forming system that operates by linking these.

[0003] For example, in an intermediate transport section (i.e., a relay machine) provided between the image forming section of an image forming device and a post-processing section that performs post-processing, a technology is known in which two transport paths are provided to invert the front and back of the paper in order to perform binding processing after image formation, and the paper is inverted and transported on each transport path (see, for example, Patent Document 1). Summary of the Invention [Problem to be solved by the invention]

[0004] The technology disclosed in Patent Document 1 aims to suppress a decrease in productivity in post-processing such as binding. However, in the conventional technology, recording media are transported one by one. This causes a problem of low productivity.

[0005] An object of the present invention is to improve productivity by conveying two or more recording media in a stacked state. [Means for solving the problem]

[0006] In order to solve the above problems, according to one aspect of the present invention, an intermediary conveyance device that relays a plurality of recording media to a post-processing device that performs post-processing on the plurality of recording media comprises: a first reversing unit that reverses a first recording medium among the plurality of recording media conveyed from a previous device; A second reversing unit that reverses a second recording medium separate from the first recording medium; The recording medium is inverted by the first inversion unit and the second recording medium is inverted by the second inversion unit. The recording medium is then stacked on top of the first recording medium and the second recording medium is then inverted by the second inversion unit. The recording medium is then conveyed to the post-processing device. Effect of the Invention

[0007] According to the present invention, productivity can be improved. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a diagram illustrating an example of the overall configuration of an image forming system. [Diagram 2] FIG. 1 illustrates an example of an image forming apparatus. [Diagram 3] FIG. 13 is a diagram illustrating an example of the overall process. [Figure 4] FIG. 13 is a diagram showing an example in which a first recording medium is transported to a first path. [Diagram 5] FIG. 13 is a diagram showing an example in which a second recording medium is transported to a second path. [Figure 6] FIG. 2 is a diagram showing an example of a state in which a first recording medium and a second recording medium are stored. [Figure 7] FIG. 13 is a diagram showing an example of conveying the sheets in a stacked manner. [Figure 8] FIG. 13 is a diagram illustrating an example of post-processing. [Figure 9] FIG. 11 is a diagram (part 1) showing an example of performing multiple binding processes. [Figure 10] FIG. 2 is a diagram (part 2) showing an example of performing multiple binding processes; [Figure 11] FIG. 11 is a diagram (part 3) showing an example of performing multiple binding processes; [Figure 12] FIG. 1 is a diagram (part 1) showing a first comparative example. [Figure 13] FIG. 2 is a diagram (part 2) showing the first comparative example. [Figure 14] FIG. 11 is a diagram illustrating a second comparative example. [Figure 15] FIG. 1 is a diagram (part 1) for explaining an example of matching. [Figure 16]FIG. 2 is a diagram (part 2) for explaining an example of matching. [Figure 17] FIG. 3 is a diagram (part 3) for explaining an example of matching. [Figure 18] This is a diagram (part 1) explaining an example where consistency is difficult. [Figure 19] FIG. 2 is a diagram (part 2) for explaining an example in which consistency is difficult. [Figure 20] This is a diagram (part 3) explaining an example where consistency is difficult. [Figure 21] 11A and 11B are diagrams illustrating an example of aligning recording media using a pair of conveying rollers. [Figure 22] FIG. 11 is a diagram illustrating an example of a third route. [Diagram 23] FIG. 2 is a diagram illustrating an example of a hardware configuration of an image forming system. [Figure 24] FIG. 13 is a diagram showing an example of an operation screen. [Diagram 25] FIG. 2 is a diagram illustrating an example of a functional configuration. [Figure 26] FIG. 13 is a diagram illustrating an example of the overall configuration of an image forming system according to a second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, specific examples will be described with reference to the accompanying drawings. Note that the embodiment is not limited to the specific examples described below.

[0010] [First embodiment]

[0011] [Example of overall configuration of image forming system] 1 is a diagram showing an example of the overall configuration of an image forming system. For example, an image forming system 100 is configured by connecting an image forming device 1000, a relay device 1001, and a post-processing device 1002. The following will be described using an example in which the recording medium is paper. The following will also be described using an example in which the relay conveying device is the relay device 1001.

[0012] 2 is a diagram showing an example of an image forming apparatus 1000. For example, the image forming apparatus 1000 has the following configuration.

[0013] The image forming apparatus 1000 includes a paper feed cassette 41 that stores paper. As shown in the figure, there may be a plurality of paper feed cassettes 41. Paper is conveyed from the paper feed cassette 41.

[0014] Each paper feed cassette 41 is provided with a separation roller 42 and a friction pad 43. The separation roller 42 and the friction pad 43 separate and transport the paper one by one. Next, the paper is transported by a pair of paper feed rollers 49.

[0015] A pair of paper feed rollers 49 transports the paper to the image forming unit.

[0016] The paper may be fed from manual feed tray 47. When the paper is placed on manual feed tray 47, pickup roller pair 46 transports the paper. Pickup roller pair 46 also transports the paper to the image forming unit.

[0017] The image forming unit 23 forms an image on a sheet of paper. For example, when forming a color image by an inkjet method, the image forming unit 23 ejects ink of Y (yellow), M (magenta), C (cyan), and B (black) onto the sheet of paper to form the image.

[0018] The image forming apparatus 1000 includes a cartridge loading section 35. For example, the cartridge loading section 35 includes ink cartridges 34B, 34C, 34M, and 34Y.

[0019] The ink cartridges 34B, 34C, 34M, and 34Y are connected to, for example, a supply pump. When the supply pump is driven, ink is supplied from the ink cartridges 34B, 34C, 34M, and 34Y to the image forming unit 23. The ink cartridges 34B, 34C, 34M, and 34Y are detachable mechanisms.

[0020] When the paper is transported to a position facing the image forming unit 23, the image forming unit 23 forms an image on the paper. After the image is formed, the paper is transported by the paper discharge roller pairs 75, 76, and 77. For example, the paper discharge roller pairs 75, 76, and 77 are roller pairs. The paper discharge roller pairs 75, 76, and 77 transport the paper to the paper discharge tray 7.

[0021] The paper may be transported to a relay device, etc. In the figure, when the paper is discharged to the left from the image forming apparatus 1000, it is transported to the relay device.

[0022] For example, a switching claw or the like is provided on the path along which the recording medium is transported by the pairs of paper discharge rollers 75, 76, and 77. The switching claw switches the destination of the paper.

[0023] In the case of double-sided printing, after an image is formed on one side of the paper, the paper is transported to path 5. For example, a separation claw 51 is provided. Then, the separation claw 51 switches the destination of the paper so that the paper is transported to path 5.

[0024] On the path 5, conveying roller pairs 52, 53, 54, and 55 are provided. The conveying roller pairs 52, 53, 54, and 55 convey the paper. In this manner, when the paper is conveyed by the conveying roller pairs 52, 53, 54, and 55, the paper is turned over. In this manner, the image forming unit 23 forms an image on the other side as well.

[0025] The image forming apparatus 1000 may include a reading device 11 and the like. The image forming apparatus 1000 may also include an automatic conveying device 12 and the like.

[0026] The reading device 11 reads an image formed on a sheet of paper. Specifically, the reading device 11 reads the image with a Charge Coupled Device (CCD) or the like. For example, the image thus read is formed on a sheet of paper by the image forming unit 23.

[0027] It should be noted that the image forming apparatus 1000 is not limited to the apparatus shown in the drawing. That is, the image forming apparatus 1000 may be configured to include other apparatuses, or may be an apparatus that forms images using other methods.

[0028] With the above-mentioned configuration, the image forming apparatus 1000 forms an image on a sheet of paper. After the image forming apparatus 1000 forms an image on the sheet of paper, the sheet of paper is transported to a relay device 1001.

[0029] The repeater 1001 has, for example, two paths. Hereinafter, a path formed by combining an eleventh path 1011 and a twelfth path 1012, which are mainly located on the lower side in the figure, will be referred to as a "first path."

[0030] On the other hand, in the figure, a route formed by combining a 21st route 1021 and a 22nd route 1022 mainly located on the upper side is referred to as a "second route."

[0031] The first path and the second path are not limited to the shapes and lengths shown in the drawings. Therefore, the first path and the second path may have shapes other than those shown in the drawings as long as they can be stored and turned over. In addition, the paths may be other than those shown in the drawings.

[0032] Specifically, it is desirable that the first path and the second path are long enough to accommodate A3 size (i.e., 420 mm in the longitudinal direction), DLT (double letter) size (i.e., 432 mm in the longitudinal direction), and irregular size (i.e., 457.2 mm), etc.

[0033] However, the first path and the second path may be long enough to accommodate a size larger than the above, i.e., so-called long paper (e.g., about 700 mm in the longitudinal direction), etc. Below, an example of a configuration assuming a typical cut paper size will be described.

[0034] A plurality of recording media are transported from the image forming apparatus 1000 to the relay device 1001. Hereinafter, among the plurality of recording media, a recording medium transported to the first path is referred to as a "first recording medium." On the other hand, among the plurality of recording media, a recording medium transported to the second path is referred to as a "second recording medium." For example, the plurality of recording media are transported alternately to the first path and the second path.

[0035] In addition, it is preferable that the relay device 1001 includes a drying device, for example, as shown in the figure. Hereinafter, the drying device installed on the first path is referred to as a "first drying device 1031." Meanwhile, the drying device installed on the second path is referred to as a "second drying device 1032."

[0036] The first drying device 1031 is composed of, for example, a first fan 1033 and a second fan 1034. Specifically, the first fan 1033 and the second fan 1034 are disposed, for example, facing each other with the first path in between.

[0037] Therefore, the first fan 1033 and the second fan 1034 blow air heated by a heater or the like onto the first recording medium housed in the first path. In this manner, the first drying device 1031 dries the first recording medium that is reversed or stopped in the first path.

[0038] The second drying device 1032 has, for example, the same configuration as the first drying device 1031. Specifically, the second drying device 1032 includes a third fan 1035, a fourth fan 1036, and the like.

[0039] Note that each drying device does not have to have the same configuration. That is, each drying device may have a different hardware configuration, etc., as long as it can dry the recording medium. For example, the positions, numbers, types, etc. of the first fan 1033, the second fan 1034, the third fan 1035, and the fourth fan 1036 may be different from the example shown in the figure.

[0040] Furthermore, the image forming system can adjust how much the recording medium is dried depending on the time the recording medium is stored in the first path or the second path. Specifically, when the image forming system wants to dry the recording medium more, the recording medium can be dried more by stopping the recording medium in the first path or the second path for a longer period of time.

[0041] As described above, if a drying device or the like is provided, the relay device 1001 can dry the recording medium at the same time as inverting the recording medium. Therefore, the image forming system can dry the recording medium without reducing productivity. Furthermore, by drying the recording medium, the image forming system 100 can easily prepare multiple recording media.

[0042] In addition, it is preferable that the repeater 1001 includes a sensor, for example, as shown in the figure. Hereinafter, the sensor installed on the first path is referred to as a "first sensor 1041." Meanwhile, the sensor installed on the second path is referred to as a "second sensor 1042."

[0043] The first sensor 1041 detects whether a first recording medium is present on the first path. Similarly, the second sensor 1042 detects whether a second recording medium is present on the second path. For example, the first sensor 1041 and the second sensor 1042 are optical sensors or touch sensors.

[0044] It should be noted that the sensor may be other than the first sensor 1041 and the second sensor 1042.

[0045] As described above, when a sensor or the like is provided, the repeater 1001 can detect, for example, the timing at which the recording medium passes the installation position of the sensor. Therefore, the repeater 1001 can adjust, for example, the timing at which the recording medium is conveyed based on the detection result of the sensor.

[0046] Moreover, the relay device 1001 desirably includes a pair of conveying rollers, for example, a first conveying roller 1051 and a second conveying roller 1052, as shown in the figure.

[0047] Specifically, the pair of conveying rollers sandwiches and conveys the recording medium. The pair of conveying rollers is, for example, a combination of a first conveying roller 1051 and a second conveying roller 1052.

[0048] For example, when a first recording medium passes through the 12th path 1012 and a second recording medium passes through the 22nd path 1022, the first recording medium and the second recording medium join and overlap. Hereinafter, a set of recording media in which the first recording medium and the second recording medium are overlapped is referred to as a "recording medium set."

[0049] In addition, when the conveying speed of the first recording medium and the conveying speed of the second recording medium are matched and the timing at which the leading ends of the recording media join is aligned using the first sensor 1041 and the second sensor 1042, the relay device 1001 can align the recording media with high precision. Furthermore, when aligned in this manner, the relay device 1001 can align the recording media without stopping the conveyance of the recording media, thereby further improving productivity.

[0050] When setting the recording medium, the first conveying roller 1051 and the second conveying roller 1052 stop rotating when the recording medium is joined. Then, the conveying unit conveys the recording medium so that it hits the pair of conveying rollers. For example, the recording medium is hit to the extent that its leading edge is bent. In this way, the conveying unit controls the rotation of the pair of conveying rollers and controls the conveying of the recording medium to the pair of conveying rollers in a stopped state.

[0051] In this way, when the recording media are butted against each other, the leading ends of the two recording media tend to become aligned. Therefore, when the recording media are butted against each other, a recording media set in which the two recording media are aligned can be created.

[0052] The relay device 1001 may align the recording media with a device other than the pair of conveying rollers.

[0053] The details of aligning the recording medium using the pair of conveying rollers will be described later.

[0054] The post-processing device 1002 includes, for example, pairs of conveying rollers 52, 53, 54, and 55. The pairs of conveying rollers 52, 53, 54, and 55 convey the paper in the same manner as in the image forming device 1000.

[0055] The post-processing device 1002 includes a diverter 81. The diverter 81 is driven in a mode that is set in advance by a user's operation, for example. For example, the diverter 81 operates as follows for each mode.

[0056] In the case of a mode in which post-processing is not performed, the branch claw 81 switches so that the destination of the paper is the first discharge tray 71.

[0057] In the sort mode, post-processing such as sorting of the sheets is performed. For example, in the sort mode, a plurality of sheets are conveyed by the conveying roller pair 54 or the like in a direction perpendicular to the conveying direction (hereinafter referred to as the "orthogonal direction") so that each sheet is shifted by a predetermined amount. Then, the sheets are conveyed to the second discharge tray 72.

[0058] In the binding processing mode, the binding device 90 performs post-processing such as stapling the sheets. First, the sheets are accumulated in the internal tray 61. Next, the sheets are transported from the internal tray 61 to the end fence 66 by the tapping roller, the auxiliary roller, and the like. Then, multiple sheets are abutted against the end fence 66, so that the edges are aligned.

[0059] Furthermore, a side fence 68 (also called a jogger fence or the like) pinches a plurality of sheets of paper in the internal tray 61. In this manner, the side fence 68 aligns the plurality of sheets of paper in the orthogonal direction.

[0060] The binding device 90 may have a plurality of devices, such as a first binding device 91 and a second binding device 92. After a process of binding a plurality of sheets of paper is performed by either one of the first binding device 91 and the second binding device 92, the sheets of paper are transported from the discharge port 50b to the second discharge tray 72 by the discharge claws 67 or the like.

[0061] In the saddle stitching mode, first, the multiple sheets of paper are stapled at their centers. After the staples are stapled, the multiple sheets of paper are folded at their centers. For example, the folding is performed by a paper folding plate 86 or the like. After the saddle stitching is performed, the multiple sheets of paper are transported to the third discharge tray 73 by the transport roller pair 59.

[0062] For example, post-processing is performed by the post-processing device 1002 as described above.

[0063] [Overall processing example] 3 is a diagram showing an example of overall processing, for example, the image forming system performs the overall processing as shown in the figure.

[0064] In step S0301, the image forming system performs image formation on a plurality of recording media by the image forming apparatus.

[0065] In step S0302, the image forming system determines whether the recording medium is the first recording medium or the second recording medium.

[0066] For example, the image forming system alternately determines a plurality of recording media as the first recording medium or the second recording medium.

[0067] Specifically, the image forming system determines the first recording medium as the first recording medium, the image forming system determines the second recording medium as the second recording medium, and the image forming system determines the third recording medium as the first recording medium.

[0068] In this manner, the image forming system regards, for example, the odd-numbered recording media among the multiple recording media as first recording media, and the even-numbered recording media as second recording media.

[0069] Next, if it is the first recording medium (step S0302: "first recording medium"), the image forming system proceeds to step S0303. On the other hand, if it is the second recording medium (step S0302: "second recording medium"), the image forming system proceeds to step S0304.

[0070] In step S0303, the image forming system causes the first reversing unit to invert the first recording medium.

[0071] In step S0304, the image forming system causes the second reversing unit to invert the second recording medium.

[0072] In step S0305, the image forming system conveys the recording medium set by the junction conveyance section.

[0073] In step S0306, the image forming system performs post-processing.

[0074] Steps S0303 to S0306 are, for example, the following processes.

[0075] FIG. 4 is a diagram showing an example of conveying the first recording medium to the first path. An example will be described in which the first sheet is P1 and the second recording medium is the second sheet P2.

[0076] In step S0301, the image forming system performs image formation on the first sheet P1 and then the second sheet P2. Therefore, the image formation on the first sheet P1 is completed earlier than that on the second sheet P2, and the first sheet P1 is transported to the relay device 1001 prior to the second sheet P2.

[0077] Thereafter, in step S0302, the image forming system determines that the first sheet P1 is the first recording medium, and determines that the second sheet P2 is the second recording medium.

[0078] In step S0303, the image forming system performs, for example, the following process. First, the image forming system transports the first sheet P1 to the eleventh path 1011. In this way, the image forming system stores the first sheet P1 in the first path.

[0079] Fig. 5 is a diagram showing an example of conveying the second recording medium to the second path. Fig. 5 differs from Fig. 4 in that the first sheet P1 is stored in the first path and image formation on the second sheet P2 is completed.

[0080] 5, the image forming system detects the first sheet P1 on the first path by the first sensor 1041. In this manner, the image forming system knows that the first sheet P1 has passed the installation position of the first sensor 1041 on the first path.

[0081] Then, when the image forming system detects the first sheet P1, it further transports the first sheet P1 and then stops transporting it.

[0082] Next, in step S0304, the image forming system performs, for example, the following process. First, the image forming system transports the second sheet P2 to the twenty-first path 1021. In this manner, the image forming system stores the second sheet P2 in the second path.

[0083] When the first sheet P1 and the second sheet P2 are stored in this manner, the image forming system is in the following state.

[0084] Fig. 6 is a diagram showing an example of a state in which a first recording medium and a second recording medium are stored. In Fig. 6, compared to Fig. 5, the first sheet P1 continues to be stopped. On the other hand, Fig. 6 differs in that the image forming system stores the second sheet P2 in the second path.

[0085] 6, the image forming system detects the second sheet P2 on the second path by the second sensor 1042. In this manner, the image forming system knows that the second sheet P2 has passed the installation position of the second sensor 1042 on the second path.

[0086] Then, when the image forming system detects the second sheet P2, the system further transports the second sheet P2 and then stops the transport.

[0087] As described above, the image forming system stores the first sheet P1 and the second sheet P2, and then transports the first sheet P1 and the second sheet P2 in a timely manner. In this way, the first sheet P1 and the second sheet P2 are as follows.

[0088] Fig. 7 is a diagram showing an example of conveying sheets in an overlapping state. Specifically, Fig. 7 is a diagram showing an example of conveying sheets in an overlapping state, in which the first sheet P1 and the second sheet P2 stored in Fig. 6 are conveyed in an overlapping state.

[0089] The image forming system, for example, transports the first sheet P1 to the twelfth path 1012 from the state shown in Fig. 6. Similarly, the image forming system, for example, transports the second sheet P2 to the twelfth path 1022 from the state shown in Fig. 6. By transporting the first sheet P1 and the second sheet P2 at such timing, the image forming system can stack the first sheet P1 and the second sheet P2 to form the recording medium set P12.

[0090] As shown in Figure 6, if the distance from the position where the first sheet P1 and the second sheet P2 are stopped to the position where the first sheet P1 and the second sheet P2 meet and overlap is the same, the image forming system can align multiple sheets by transporting the first sheet P1 and the second sheet P2 at the same time from the state shown in Figure 6.

[0091] On the other hand, in FIG. 6, if the positions at which the first sheet P1 and the second sheet P2 are stopped are different, it is desirable for the image forming system to adjust the timing of transporting the first sheet P1 and the second sheet P2, etc.

[0092] As shown in Fig. 7, the relay device 1001 stacks a first sheet P1 and a second sheet P2 as a plurality of recording media and conveys them as a recording medium set. The first sheet P1 or the second sheet P2 alone is often weak in rigidity. Therefore, by forming the recording medium set, it is possible to prevent problems such as bending of either or both of the first sheet P1 or the second sheet P2 during post-processing performed in the subsequent stage.

[0093] For example, if the image forming apparatus is an inkjet printer, the first sheet P1 and the second sheet P2 tend to become recording media that contain a lot of moisture after image formation, etc. In such a state, the recording media tend to bend easily. If an alignment process is performed on such recording media, it is expected that it will be difficult to align the edges of each recording medium.

[0094] On the other hand, according to this embodiment, the first sheet P1 and the second sheet P2 are transported in an overlapping state, so that the sheet P1 and the second sheet P2 can be subjected to post-processing in a state of increased rigidity. Therefore, the productivity of inkjet printers and the like can be particularly improved.

[0095] Furthermore, when the recording medium contains a lot of moisture due to image formation by an inkjet printer or the like, the recording medium is likely to bend. When the recording medium is transported one by one and aligned, the recording medium is likely to bend, and alignment accuracy is likely to decrease. In contrast, when two or more recording media are transported in a stack, as in this embodiment, the recording media are less likely to bend compared to when the recording media are transported one by one. Therefore, it is easy for the relay device or the like to align the recording media.

[0096] Next, in step S0305, the image forming system conveys the recording medium set P12 to the post-processing device, and performs post-processing, for example, as follows.

[0097] 8 is a diagram showing an example of post-processing. Hereinafter, a case will be described in which a binding process mode is set in advance and the image forming system performs binding process, which is an example of post-processing.

[0098] The image forming system performs a binding process on the recording medium set P12. As shown in the figure, the image forming system conveys the first sheet P1 and the second sheet P2 in a stacked state in the recording medium set P12.

[0099] When performing the binding process, the image forming system may align the recording medium set P12.

[0100] After performing the binding process and the like in this manner, the image forming system ejects the recording medium set P12.

[0101] As described above, some or all of the processes in the overall process may be performed in parallel.

[0102] After the overall process as described above has been performed, the image forming system can perform, for example, binding processing as follows.

[0103] Fig. 9 is a diagram (part 1) showing an example of performing multiple binding processes. First, by performing the processes shown in Fig. 4 to Fig. 8, the image forming system can create the first recording medium set by stacking the eleventh sheet P101 and the twenty-first sheet P201. When this recording medium set is conveyed to the post-processing device, the image forming system performs post-processing on the recording medium set at the following positions.

[0104] FIG. 10 is a diagram (part 2) showing an example in which the binding process is performed multiple times.

[0105] Hereinafter, the first recording medium (the second first recording medium in the figure) following the 11th sheet P101 and the 21st sheet P201 will be referred to as the 12th sheet P102. Also, the second recording medium (the second second recording medium in the figure) following the 11th sheet P101 and the 21st sheet P201 will be referred to as the 22nd sheet P202.

[0106] Furthermore, the first recording medium (the third first recording medium in the figure) next to the twelfth sheet P102 is the thirteenth sheet P103. Also, the second recording medium (the third second recording medium in the figure) next to the twenty-second sheet P202 is the twenty-third sheet P203.

[0107] While performing post-processing on the recording medium set of the 11th sheet P101 and the 21st sheet P201, the image forming system processes the 12th sheet P102, the 22nd sheet P202, the 13th sheet P103, and the 23rd sheet P203, for example, as follows.

[0108] FIG. 11 is a diagram (part 3) showing an example in which the binding process is performed multiple times.

[0109] As shown in FIGS. 10 and 11, the image forming system conveys a first recording medium and a second recording medium in an overlapping manner.

[0110] In this way, since multiple recording media are conveyed together, there is enough time to convey the recording media to the positions of the 12th sheet P102 and the 22nd sheet P202 in Fig. 11. Therefore, the image forming system can perform processing of downstream recording media without stopping. Therefore, the image forming system can improve productivity.

[0111] [First Comparative Example] In the first comparative example, the recording media are not stacked, but are conveyed one by one, for example, as follows.

[0112] FIG. 12 is a diagram (part 1) showing a first comparative example.

[0113] FIG. 13 is a diagram (part 2) showing the first comparative example.

[0114] Specifically, as shown in FIGS. 12 and 13, in the first comparative example, the sheets P501 to P506 are transported one by one.

[0115] 12, first, the sheet P501 arrives at the binding processing device 90. Next, the sheet P502 arrives at the binding processing device 90. In this way, in the first comparative example, the sheets merge at the binding processing device 90. After this merging, the binding processing device 90 performs the first binding process.

[0116] In the first comparative example, while sheets P501 and P502 are being bound and discharged, sheets P503 and after are stopped and waited at a position as shown in FIG. 13, or are conveyed with a wider space between the sheets. This tends to reduce productivity.

[0117] [Second Comparative Example] 14 is a diagram showing a second comparative example. Hereinafter, the second comparative example will be described with reference to FIG. 1 of JP 2020-100477 A. The second comparative example is an example in which an intermediate unit 3 and a recording unit 2 are connected to construct an image forming system.

[0118] In the second comparative example, the intermediate unit 3 receives the medium in the direction of the first arrow A1, and then switches the medium back in the direction of the second arrow A2. Also, in the second comparative example, the intermediate unit 3 receives the medium in the direction of the third arrow B1, and then switches the medium back in the direction of the fourth arrow B2.

[0119] In this way, when reversing the signal using a repeater or the like, the repeater must secure a path for reversing the signal, and therefore the device tends to become larger in size in order to secure the path.

[0120] On the other hand, if the image forming apparatus is configured to invert the sheet, the relay device or the like does not need a path for inversion.

[0121] In the second comparative example, while the medium is reversed in the directions of the first arrow A1 and the second arrow A2, the medium is reversed in the directions of the third arrow B1 and the fourth arrow B2, and the medium is transported alternately along the two routes.

[0122] The binding unit aligns the transported media and then performs the binding process. In the comparative example, the operation of aligning the media is performed each time a medium is transported. Therefore, in order to ensure time to perform the operation of aligning the media, the medium is transported with a sufficient interval between it and the next medium.

[0123] Furthermore, since it takes additional time to perform the binding process or the discharge process after the operation of aligning the media, the media are transported with an interval between them.

[0124] Thus, the second comparative example may take a long time and have low productivity.

[0125] [Example of matching] It is preferable that the image forming system is configured to align the first recording medium and the second recording medium in a post-processing device or the like.

[0126] 15 is a diagram (part 1) for explaining an example of alignment. Below, as shown in the figure, an example will be explained in which alignment is performed at the end fence 66. However, alignment may be performed at a location other than the end fence 66. For example, alignment may be achieved by pressing the recording medium against the end fence.

[0127] Also, in this example, the recording medium set is in a state in which the second sheet P2 (the recording medium at the top in the figure) protrudes from the first sheet P1 (the recording medium at the bottom in the figure) (in the figure, this means that the second sheet P2 is shifted to the upper left relative to the first sheet P1).

[0128] When the recording medium set is conveyed in the state shown in FIG. 15, the image forming system aligns the two recording media, and after the alignment, performs a binding process.

[0129] 15, the image forming system transports the recording medium set in the lower right direction in the figure by the auxiliary roller 93. When transported in this manner, the recording medium set is in the following state.

[0130] Fig. 16 is a diagram (part 2) for explaining an example of alignment. Fig. 16 differs from Fig. 15 in that the recording medium set is conveyed by the auxiliary roller 93 and moves to the lower right in the diagram.

[0131] When the recording medium set is transported by the auxiliary rollers 93 from the state shown in Fig. 15, the first sheet P1 hits the end fence 66 before the second sheet P2, as shown in Fig. 16. From this state, the image forming system further transports the recording medium set by the auxiliary rollers 93. When transported in this manner, the recording medium set is in the following state.

[0132] Fig. 17 is a diagram (part 3) for explaining an example of alignment. Fig. 17 differs in that the second sheet P2 is further conveyed to the lower left in the figure by the auxiliary roller 93, and the two recording media that make up the recording medium set are nearly aligned.

[0133] 16, the first sheet P1 is in a state where it has butted up against the end fence 66. Therefore, it is difficult for the first sheet P1 to move any further. On the other hand, the second sheet P2 is still in a state where it can move. Therefore, by using the auxiliary roller 93 to transport the second sheet P2, the image forming system can move the second sheet P2 and align the first sheet P1 and the second sheet P2.

[0134] Moreover, it is preferable that the recording medium set is transported in a state in which the second paper P2 can be moved and aligned, for example, as shown in FIG.

[0135] For example, in the following situation, the image forming system may have difficulty in aligning the first recording medium and the second recording medium.

[0136] Fig. 18 is a diagram (part 1) for explaining an example in which alignment is difficult. Compared to Fig. 15, Fig. 18 is the opposite of Fig. 15, in that the first sheet P1 protrudes from the second sheet P2 (in the figure, this refers to a state in which the first sheet P1 is shifted to the upper left relative to the second sheet P2).

[0137] Hereinafter, as in the case of FIGS. 15 to 17, the case where alignment is performed by the auxiliary roller 93 will be described as an example.

[0138] 19 is a diagram (part 2) for explaining an example in which alignment is difficult. When the sheets are conveyed by the auxiliary roller 93 from the state shown in FIG. 18, the second sheet P2 hits the end fence 66 before the first sheet P1, which is the opposite of the case shown in FIG.

[0139] 20 is a diagram (part 3) for explaining an example in which alignment is difficult. As shown in the figure, the auxiliary roller 93 transmits a conveying force to the second sheet P2, so it may be difficult for the auxiliary roller 93 to convey the first sheet P1 that is below the second sheet P2. As a result, the first sheet P1 and the second sheet P2 may not be aligned.

[0140] Therefore, it is preferable that the image forming system transports the recording medium set in a state where alignment can be easily performed. In other words, it is preferable that the image forming system transports the recording medium set in a state where the two recording media can be aligned by moving them with the auxiliary roller 93. Specifically, as shown in Fig. 15, it is preferable that the image forming system overlaps the recording media by shifting the second paper P2, which is easier to move, by a predetermined amount.

[0141] In this way, the image forming system can align the recording media with high precision, as shown in FIG.

[0142] For example, the image forming system adjusts the timing of conveying the first recording medium or the second recording medium, etc., to convey the recording medium so as to achieve the positional relationship shown in Fig. 15. Specifically, the image forming system adjusts the time from when the sensor detects the recording medium to when conveyance of the recording medium begins, etc.

[0143] On the other hand, the image forming system adjusts the position at which the first recording medium or the second recording medium is conveyed and stopped, etc., to convey the recording media so as to achieve the positional relationship shown in Fig. 15. Specifically, the image forming system adjusts the timing at which the recording medium conveyance starts to be conveyed to be the same, and conveys one of the recording media a longer or shorter distance. In this way, by adjusting the conveying distance, the image forming system can convey the recording media so as to achieve the positional relationship shown in Fig. 15.

[0144] In this manner, the image forming system aligns the recording media whose positional relationship and the like have been adjusted.

[0145] [Example of aligning recording media using a pair of conveyor rollers] 21 is a diagram showing an example of aligning recording media using a pair of conveying rollers. In the following, an example of the first recording medium is the 61st sheet of paper P601, and an example of the second recording medium is the 62nd sheet of paper P602.

[0146] The pair of conveying rollers is, for example, a first conveying roller 1051 and a second conveying roller 1052. That is, the pair of conveying rollers is a so-called nip roller that sandwiches and conveys the recording medium.

[0147] As shown in the drawing, the 61st sheet P601 and the 62nd sheet P602 are conveyed from the first path and the second path, and then merge together. Then, the conveying roller pair stops at the point where the sheets merge.

[0148] After stopping the pair of conveying rollers, the image forming system butts the 61st sheet of paper P601 and the 62nd sheet of paper P602 together. In this way, the image forming system can align the leading edges of the 61st sheet of paper P601 and the 62nd sheet of paper P602.

[0149] It is preferable that the image forming system strikes the 61st sheet P601 and the 62nd sheet P602 with enough strength to bend them. Specifically, based on the viewpoint of correcting skew, it is preferable that the image forming system bends the 61st sheet P601 and the 62nd sheet P602 by about 3 mm from the leading edge. However, the amount of bending differs depending on the conditions of the recording medium. Therefore, it is preferable that the amount of bending can be set.

[0150] [Example of the third route] 22 is a diagram showing an example of the third path. For example, the third path is a straight path 1030 as shown in the figure. It is desirable for the repeater 1001 to be provided with a third path such as the straight path 1030.

[0151] For example, the third path is used to transport the recording medium to the post-processing device 1002 while maintaining the first and second sides of the recording medium at the time of ejection from the image forming device 1000. In other words, the third path is a transport path used when it is not necessary to invert the recording medium in the relay device 1001 before ejecting it to the post-processing device 1002.

[0152] Specifically, when copying the same image to a plurality of recording media, it is sufficient to eject the recording media to the post-processing device 1002 while maintaining the state of the recording media received in the relay device 1001. For example, such a case is defined as a "condition where reversal is not required."

[0153] That is, when the relay device 1001 transports the recording medium through the third path, the recording medium is transported while maintaining the first and second sides at the time when the image formation is completed.

[0154] Under conditions where reversal is not required, the relay device 1001 can transport the sheet over a shorter distance by using the straight path 1030. Therefore, the productivity of the image forming system can be improved.

[0155] [Hardware configuration example] 23 is a diagram showing an example of the hardware configuration of the image forming system 100. For example, the image forming system 100 performs control using the following hardware configuration.

[0156] For example, in the image forming system 100, when a start key provided on the image forming apparatus 1000 is pressed, the post-processing apparatus 1002 acquires a mode and the like from the image forming apparatus 1000, etc. Also, the post-processing apparatus 1002 may acquire information on a recording medium and information on a process to be executed from the image forming apparatus 1000, etc.

[0157] The modes are, for example, a sorting mode, a binding mode, and a saddle stitching mode. However, the modes may also include other modes such as a mode in which binding is performed using staples, or a mode in which the recording medium is shifted. Specifically, the modes may also include a punching mode. For example, the punching mode is performed by the punching unit 56 in FIG. 1.

[0158] The control is performed, for example, by a control device included in the post-processing device 1002. In the following, an example in which the control device is a central processing unit (hereinafter referred to as "CPU 150") will be described. However, the control device that performs the control may be provided in a device other than the post-processing device 1002.

[0159] For example, the CPU 150 controls a DC motor 152, a stepping motor 154, a sensor 156, and the like provided in the image forming system 100. The DC motor 152, the stepping motor 154, and the sensor 156 are controlled via, for example, a first motor driver 151, a second motor driver 153, and a driver 155, and the like.

[0160] The DC motor 152 and the stepping motor 154 are examples of actuators, and therefore the DC motor 152 and the stepping motor 154 perform, for example, transport of a recording medium.

[0161] The sensor 156 detects the recording medium.

[0162] The hardware configuration is not limited to the configuration shown in the figure, and the hardware configuration may be a configuration using control devices, storage devices, arithmetic units, actuators, sensors, mechanisms, etc. other than those shown in the figure.

[0163] 24 is a diagram showing an example of an operation screen. For example, the image forming system displays an operation screen for a user to input parameters to be used for adjustment. First, the image forming system displays a first operation screen 701, etc. For example, when the user presses "shift amount" on the first operation screen 701, the user can set the shift amount for overlapping the recording media on a second screen 702, etc.

[0164] The image forming system can grasp, based on the set value of the amount of misalignment, how much the recording media should be misaligned when they are to be stacked.

[0165] The operation screen may also be capable of setting a mode, or whether or not to abut the pair of transport rollers, etc. Using such an operation screen, the user can switch between processes such as abutting the pair of transport rollers.

[0166] [Example of functional configuration] 25 is a diagram showing an example of a functional configuration of the image forming system 100. For example, the image forming system 100 is configured by connecting an image forming apparatus 1000, a relay device 1001, and a post-processing device 1002 as shown in the figure.

[0167] For example, the image forming apparatus 1000 includes an image forming section 100F1, etc. The relay device 1001 includes a first reversing section 100F2, a second reversing section 100F3, and a conveying section 100F4, etc. The post-processing device 1002 includes a post-processing section 100F5, etc.

[0168] Moreover, the first reversing unit 100F2 preferably further includes a first path 100F6, a first detection unit 100F7, and a first drying unit 100F8, etc. Similarly, the second reversing unit 100F3 preferably further includes a second path 100F9, a second detection unit 100F10, and a second drying unit 100F11, etc.

[0169] Furthermore, it is preferable that the repeater 1001 further includes a third path 100F12, and an adjustment unit 100F13, etc. Also, it is preferable that the post-processing device 1002 further includes a matching unit 100F14, etc. Below, a description will be given taking the functional configuration shown in the figure as an example.

[0170] The image forming section 100F1 performs an image forming procedure for forming images on a plurality of recording media. For example, the image forming section 100F1 is realized by the image forming unit 23 and the like.

[0171] The first reversing section 100F2 performs a first reversing procedure for reversing the first recording medium.

[0172] The second reversing section 100F3 performs a second reversing procedure for reversing the second recording medium.

[0173] The first detection unit 100F7 performs a first detection procedure to detect the first recording medium stored in the first path 100F6. For example, the first detection unit 100F7 is realized by a first sensor 1041 or the like.

[0174] The second detection unit 100F10 performs a second detection procedure to detect the second recording medium stored in the second path 100F9. For example, the second detection unit 100F10 is realized by a second sensor 1042 or the like.

[0175] The first drying unit 100F8 performs a first drying procedure for drying the first recording medium. For example, the first drying unit 100F8 is realized by a first fan 1033, a second fan 1034, and the like.

[0176] The second drying section 100F11 performs a second drying procedure for drying the second recording medium. For example, the second drying section 100F11 is realized by a third fan 1035, a fourth fan 1036, and the like.

[0177] The third path 100F12 is a path used for conveying the first and second sides of the first and second recording media while maintaining them.

[0178] The adjustment unit 100F13 performs an adjustment procedure to adjust the timing of conveying either the first recording medium or the second recording medium, or the position at which the recording medium is conveyed and stopped. For example, the adjustment unit 100F13 is realized by the CPU 150 or the like.

[0179] The alignment unit 100F14 performs an alignment procedure for aligning the first recording medium and the second recording medium. For example, the alignment unit 100F14 is realized by an auxiliary roller 93 or the like.

[0180] The conveying unit 100F4 performs a conveying procedure for conveying the recording medium set. For example, the conveying unit 100F4 is realized by a DC motor 152 or the like.

[0181] The post-processing unit 100F5 performs a post-processing procedure for performing post-processing on the recording medium set. For example, the post-processing unit 100F5 is realized by the binding device 90 or the like.

[0182] As described above, when two or more recording media are conveyed in a stacked state, the recording media are less likely to bend.

[0183] A recording medium is easily bent due to its thin thickness, moisture content, material, etc. That is, the rigidity of the recording medium may decrease due to moisture, etc. In this way, when a recording medium is easily bent, if an attempt is made to align the recording medium, the recording medium will bend, and it is often difficult to align the recording medium. That is, when a recording medium is easily bent, the recording medium will often buckle even with a weak force.

[0184] For example, even if a member such as a side fence is used to align the recording media, if the recording media is prone to bending, it is often difficult to align the recording media, and therefore the alignment accuracy is likely to deteriorate.

[0185] Therefore, multiple recording media are stacked. When multiple recording media are stacked in this way to form a recording media set, the recording media are less likely to bend compared to when there is only one recording media. Therefore, even if the recording media contains moisture or the like, the recording media are less likely to bend, making it easier to align the recording media.

[0186] Furthermore, if the recording medium is easy to align, defects in the process of aligning the recording medium can be reduced. Furthermore, if the recording medium is difficult to bend, the recording medium can be aligned with high accuracy using members used for aligning the recording medium, such as side fences.

[0187] When performing post-processing such as binding, if the recording media are transported one by one, there is a risk of waiting for the next recording media to be fed while the recording media are stacked and aligned, which can lead to a decrease in productivity, such as by increasing the spacing between recording media.

[0188] On the other hand, when multiple recording media are stacked to form a recording media set, the image forming system only needs to align the recording media in the time it takes to convey two sheets when performing post-processing such as binding, etc. Therefore, the image forming system can process the next recording medium without leaving an interval between them.

[0189] Similarly, when performing binding processing or discharging, the recording media are conveyed in a stacked manner, which allows for more time for processing. In this way, the interval between the next recording media can be narrowed, so the image forming system can improve the productivity of the binding processing, etc.

[0190] [Second embodiment] The image forming system may have the following configuration, for example.

[0191] 26 is a diagram showing an example of the overall configuration of an image forming system according to the second embodiment. For example, the image forming system 120 may have the following configuration.

[0192] Specifically, in the second embodiment, the image forming system 120 includes an image forming apparatus 2000 and a post-processing apparatus 2001.

[0193] That is, compared to the first embodiment, the image forming system 120 is different in that it does not have a relay device.

[0194] In this way, the post-processing device 2001 may be integrated with the relay device. With this configuration, the image forming system 120 can be made compact.

[0195] [Other embodiments] The control method described above may be realized, for example, by a program. That is, the control method is a method executed by a computer by causing an arithmetic unit, a storage unit, an input unit, an output unit, and a control unit to cooperate with each other and operate based on the program. The program may be written in a storage unit or a storage medium, etc., and distributed, or distributed via a telecommunication line, etc.

[0196] Each of the devices described above does not have to be a single device, that is, each device may be a system made up of multiple devices.

[0197] The image forming apparatus may be, for example, a commercial printing machine (such as a large electrophotographic printer or an inkjet printer).

[0198] The recording medium is, for example, paper (also called "plain paper"). However, the recording medium may be coated paper other than paper, label paper, overhead projector sheet, film, or flexible thin plate. The recording medium may also be roll paper.

[0199] In other words, the material of the recording medium may be a material to which ink droplets or paint such as toner can adhere, can adhere temporarily, adhere and stick, or adhere and penetrate.

[0200] Specifically, the recording medium may be a recording medium such as paper, film, or cloth, an electronic board, an electronic component such as a piezoelectric element (also referred to as a "piezoelectric member"), a powder layer (also referred to as a "powder layer"), an organ model, or a test cell, etc.

[0201] Thus, the material of the recording medium may be any material to which paint can be attached, such as paper, thread, fiber, cloth, leather, metal, plastic, glass, wood, ceramics, or a combination of these.

[0202] The present invention is not limited to the above-described embodiments, and various modifications are possible without departing from the technical gist of the present invention. The present invention covers all technical matters included in the technical ideas described in the claims. The above-described embodiments are preferred examples, but a person skilled in the art can realize various modifications from the disclosed contents. Such modifications are also included in the technical scope described in the claims. [Explanation of symbols]

[0203] 68: Side fence 100: Image forming system 100F1: Image forming section 100F10: Second detection unit 100F11: 2nd drying section 100F12: Route 3 100F13: Adjustment section 100F14: Matching part 100F2: First inversion section 100F3: Second reversal section 100F4: Transport section 100F5: Post-processing section 100F6: Route 1 100F7: First detection unit 100F8: 1st drying section 100F9: 2nd route 120: Image forming system 1000: Image forming device 1001: Repeater 1002: Post-processing device 1011: Route 11 1012: Route 12 1021: Route 21 1022: Route 22 1030: Straight line 1031: 1st drying device 1032:Second drying device 1033: First Fan 1034: Second Fan 1035: 3rd Fan 1036: 4th Fan 1041: First sensor 1042: Second sensor 1051: First conveyor roller 1052: Second conveyor roller 2000: Image forming equipment 2001: Aftertreatment device P1: First page P101: 11th page P102: 12th page P103: 13th page P12: Recording media set P2: Second sheet P201: Page 21 P202: Page 22 P203: Page 23 P601: 61st form P602: Paper 62 [Prior art documents] [Patent documents]

[0204] [Patent Document 1] JP 2020-100477 A

Claims

1. A relay conveyance device that relays a plurality of recording media to a post-processing device that performs post-processing on the plurality of recording media, a first reversing unit that reverses a first recording medium among the plurality of recording media conveyed from a previous device; a second reversing unit that reverses a second recording medium separate from the first recording medium; a joining conveying section that overlaps the leading ends of the first recording medium inverted by the first inversion section and the second recording medium inverted by the second inversion section and conveys them to the post-processing device; Intermediate transport equipment.

2. a pair of rollers for conveying the first recording medium and the second recording medium by sandwiching them; After the roller pair is stopped, a conveying section that abuts the first recording medium and the second recording medium against the pair of rollers and aligns the first recording medium and the second recording medium. The relay transport device according to claim 1 .

3. A recording medium conveying apparatus comprising: a pair of rollers for conveying the first recording medium and the second recording medium by sandwiching them; After the first recording medium is stopped at the first reversing section and the second recording medium is stopped at the second reversing section, restarting the conveyance of the first recording medium and the second recording medium toward the pair of rollers; The pair of rollers overlap the leading ends of the first recording medium and the second recording medium. The relay transport device according to claim 1.

4. The first inversion portion is The first recording medium is stored in a first path; a first detection unit that detects the first recording medium stored in the first path, The second inversion portion is The second recording medium is stored in a second path; a second detection unit that detects the second recording medium stored in the second path; The relay transport device according to claim 1 .

5. An adjustment unit is provided that adjusts the timing of conveying the first recording medium or the second recording medium, or the position at which the first recording medium or the second recording medium is conveyed and stopped. The relay transport device according to claim 1 .

6. The first inversion portion is a first drying unit that dries the first recording medium; The second inversion portion is A second drying unit is provided for drying the second recording medium. The relay transport device according to claim 1 .

7. a third path for conveying the first recording medium and the second recording medium while maintaining the first surface and the second surface of the first recording medium and the second recording medium; The relay transport device according to claim 1 .

8. A post-processing device comprising the relay conveying device according to any one of claims 1 to 7.

9. an image forming apparatus for forming images on a plurality of recording media; a relay device that conveys the plurality of recording media discharged from the image forming apparatus; a post-processing device for performing post-processing on the recording media discharged from the relay device, 1. An image forming system, comprising: The image forming system, wherein the relay device is the relay transport device according to claim 1 .

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