Aftertreatment Device

Abstract

To provide a post-processing device that can reduce the risk that an image recorded on a medium may be damaged.SOLUTION: A post-processing device comprises: a first ejection part 23 that ejects a medium 17 recorded by a recording part that performs recording by ejecting liquid; a processing tray 24 on which the medium 17 ejected by the first ejection part 23 is placed; an end part alignment part 30, provided in the processing tray 24, which aligns an end part of the medium 17; a conveyance part 31 that conveys the medium 17 to the end part alignment part 30 while contacting an upper surface of the medium 17 placed on the processing tray 24; a position changing part 32 that changes a relative position of the conveyance part 31 with respect to the processing tray 24; a control part 38 that controls the position changing part 32 so that pressure for the conveyance part 31 to press the medium 17 is changed; and a post-processing part 33 that performs post-processing to the medium 17 on the processing tray 24. The control part 38 changes the pressure on the basis of processing information concerning processing that is performed to the medium 17.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a post-processing device. [Background technology]

[0002] For example, as disclosed in Patent Document 1, there is a post-processing device that performs post-processing on sheets, which are an example of a medium on which an image is formed. The post-processing device includes a processing tray on which sheets are stacked, a transport unit that transports the sheets on the processing tray, and a trailing edge regulating member, which is an example of an edge alignment unit. The transport unit aligns the sheets by abutting them against the trailing edge regulating member. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2015-30602 A Summary of the Invention [Problem to be solved by the invention]

[0004] The conveying section of Patent Document 1 may press the sheet with a large pressure when it comes into contact with the upper surface of the sheet, and in this case, depending on the state of the sheet, there is a risk that the conveying section may damage the image. [Means for solving the problem]

[0005] A post-processing device that solves the above problem comprises a discharge unit that discharges a medium recorded by a recording unit that records by ejecting liquid, a processing tray that loads the medium discharged by the discharge unit, an end alignment unit provided on the processing tray that aligns the end of the medium, a transport unit that contacts the top surface of the medium placed on the processing tray and transports the medium to the end alignment unit, a position change unit that changes the relative position of the transport unit with respect to the processing tray, a control unit that changes the pressure with which the transport unit presses the medium by controlling the position change unit, and a post-processing unit that performs post-processing on the medium on the processing tray, and the control unit changes the pressure based on processing information related to the processing to be performed on the medium. [Brief description of the drawings]

[0006] [Figure 1] FIG. 1 is a perspective view showing a first embodiment of a recording system including a post-processing device. [Diagram 2] FIG. [Diagram 3] 4 is a flowchart showing a matching routine according to the first embodiment. [Figure 4] 10 is a flowchart showing a matching routine according to a second embodiment. [Diagram 5] 13 is a flowchart showing a matching routine according to a third embodiment. [Figure 6] 13 is a flowchart showing a matching routine according to a fourth embodiment. [Figure 7] 13 is a flowchart showing a matching routine according to the fifth embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0007] (First embodiment) [System of Record] A first embodiment of a recording system including a post-processing device will be described below with reference to the drawings.

[0008] In the drawings, the recording system 11 is assumed to be placed on a horizontal plane, with the direction of gravity indicated by the Z axis, and directions along the horizontal plane indicated by the X and Y axes. The X, Y, and Z axes are perpendicular to one another. In the following description, the direction parallel to the X axis is also referred to as the width direction X, the direction parallel to the Y axis is also referred to as the transport direction Y, and the direction parallel to the Z axis is also referred to as the vertical direction Z.

[0009] 1, the recording system 11 includes a recording device 12, an intermediate device 13, a post-processing device 14, and a folding device 15, which are arranged side by side in the transport direction Y. The recording device 12, the intermediate device 13, the post-processing device 14, and the folding device 15 are arranged adjacent to one another.

[0010] The recording device 12 is, for example, an inkjet printer that records an image by ejecting ink, which is an example of a liquid, onto the medium 17. The image is formed by the liquid attached to the medium 17. The image includes photographs, patterns, characters, symbols, marks, lines, tables, and the like.

[0011] The recording device 12 may include an operation unit 18, such as a touch panel, for operating the recording device 12 and the recording system 11, and a medium storage unit 19 capable of storing the media 17 in a stacked state. The recording device 12 may include multiple medium storage units 19.

[0012] The recording device 12 includes a recording unit 21 that performs recording by ejecting liquid. The recording unit 21 performs recording on the media 17 sent out one by one from the medium storage unit 19. The recording unit 21 in this embodiment is a line type that is provided across the width direction X of the medium 17. The recording unit 21 may also be configured as a serial type that performs recording while moving in the width direction X of the medium 17.

[0013] Recording device 12 can perform single-sided recording, which records on only one side of medium 17, and double-sided recording, which records on both sides of medium 17. When performing single-sided recording, recording device 12 records on the front side of medium 17 and then sends medium 17 to intermediate device 13. When performing double-sided recording, recording device 12 records on the front side of medium 17, then turns medium 17 over and returns it to recording section 21, where it records on the back side of medium 17. Recording device 12 sends medium 17 with recording on both sides recorded to intermediate device 13.

[0014] The intermediate device 13 sends the medium 17, which has been recorded on one or both sides, to the post-processing device 14. When performing center folding processing on the recorded medium 17, in which the medium 17 is folded in half, the post-processing device 14 sends the medium 17 to the center folding device 15. The center folding device 15 may perform a center stitching process on the medium 17, in which the medium 17 is stapled in the center.

[0015] [Post-processing device] 2, post-processing device 14 includes a first discharge unit 23, which is an example of a discharge unit that discharges medium 17 recorded by recording unit 21, and a processing tray 24 that stacks medium 17 discharged by first discharge unit 23. Post-processing device 14 may also include a second discharge unit 25 that discharges medium 17 stacked on processing tray 24, and a stacking tray 26 that stacks medium 17 discharged by second discharge unit 25.

[0016] Each of first discharge unit 23 and second discharge unit 25 may be configured with a pair of rollers. First discharge unit 23 and second discharge unit 25 rotate with medium 17 sandwiched between them to discharge medium 17.

[0017] In this embodiment, the aligned medium 17 placed on the processing tray 24 is referred to as the first medium 17a, the unaligned medium 17 discharged by the first discharge section 23 is referred to as the second medium 17b, and the medium 17 placed on the stacking tray 26 is referred to as the third medium 17c. The first discharge section 23 discharges the second medium 17b in the first discharge direction D1. The second discharge section 25 discharges the first medium 17a in the second discharge direction D2.

[0018] The processing tray 24 is located downstream of the first discharge section 23 in the first discharge direction D1, and at least a portion of it is located below the first discharge section 23 in the vertical direction Z. Therefore, the processing tray 24 receives the second medium 17b that is discharged by the first discharge section 23 and falls. The second medium 17b becomes the first medium 17a by being aligned on the processing tray 24. In other words, the second medium 17b discharged from the first discharge section 23 is stacked on the processing tray 24 and aligned, and is considered to be the first medium 17a.

[0019] The stacking tray 26 is located downstream of the second discharge section 25 in the second discharge direction D2, and at least a portion of the stacking tray 26 is located below the second discharge section 25 in the vertical direction Z. Therefore, the stacking tray 26 receives the first medium 17a that is discharged by the second discharge section 25 and falls. When the first medium 17a is stacked on the stacking tray 26, it is regarded as the third medium 17c.

[0020] Post-processing device 14 may include a detection unit 28 capable of detecting second medium 17b, and a paddle 29 provided downstream in first discharge direction D1 from first discharge unit 23. Post-processing device 14 includes an end alignment unit 30 provided in processing tray 24, and a transport unit 31 that transports medium 17 to end alignment unit 30. Post-processing device 14 includes a position change unit 32 that changes the relative position of transport unit 31 with respect to processing tray 24, and a post-processing unit 33 that performs post-processing on medium 17 on processing tray 24.

[0021] The paddle 29 is located above the processing tray 24. The paddle 29 has a rotating shaft 35 and at least one blade 36. The paddle 29 in this embodiment has three blades 36. The blade 36 is, for example, a plate-like member having elasticity. The blade 36 rotates integrally with the rotating shaft 35.

[0022] The conveying unit 31 may be configured, for example, by a knurled belt. A knurled belt is a belt having an uneven surface, and the frictional force between the belt and a contacting object is higher than that of a belt having a flat surface.

[0023] The position changer 32 moves at least one of the processing tray 24 and the transport unit 31. In this embodiment, the position changer 32 moves the transport unit 31 to a waiting position WP indicated by a solid line in FIG. 2 and a transport position TP indicated by a two-dot chain line.

[0024] The standby position WP is a position where the transport unit 31 is away from the processing tray 24, the first medium 17a loaded on the processing tray 24, and the second medium 17b fed by the paddle 29. The transport position TP is a position where the transport unit 31 comes into contact with the second medium 17b. The transport unit 31 positioned at the transport position TP sandwiches the first medium 17a and the second medium 17b between itself and the processing tray 24. When the first medium 17a is not loaded on the processing tray 24, the transport unit 31 sandwiches the second medium 17b between itself and the processing tray 24. Therefore, the transport position TP changes depending on the thickness of the medium 17 loaded on the processing tray 24.

[0025] The transport unit 31, located at the transport position TP, rotates counterclockwise in FIG. 2 to transport the second medium 17b in the alignment direction D3. The alignment direction D3 is a direction parallel to the surface on which the processing tray 24 stacks the first medium 17a. The end alignment unit 30 is located at the downstream end of the processing tray 24 in the alignment direction D3. The transport unit 31 aligns the second medium 17b by abutting it against the end alignment unit 30.

[0026] In other words, the end alignment section 30 aligns the end of the second medium 17b transported by the transport section 31. Alignment in this embodiment means bringing the downstream end of the second medium 17b in the alignment direction D3 into contact with the end alignment section 30. When the first medium 17a is placed on the processing tray 24, the end of the first medium 17a and the end of the second medium 17b are aligned by aligning the second medium 17b. Since the second medium 17b is regarded as the first medium 17a after being aligned, multiple first media 17a are stacked on the processing tray 24 with their downstream ends aligned in the alignment direction D3.

[0027] The post-processing device 14 of this embodiment performs a staple process on the first medium 17a. The staple process is a process of binding multiple sheets of the first medium 17a with staples. The post-processing device 14 may also perform a punch process, a shift process, and the like. The punch process is a process of making holes in one or multiple sheets of the first medium 17a. The shift process is a process of discharging the first medium 17a onto the stacking tray 26 in sets and discharging each set at a different position.

[0028] The post-processing device 14 includes a control unit 38. The control unit 38 may comprehensively control the driving of each mechanism in the post-processing device 14 and control various operations executed by the post-processing device 14. The control unit 38 may be configured as a circuit including: α: one or more processors that execute various processes according to a computer program; β: one or more dedicated hardware circuits, such as application specific integrated circuits, that execute at least a part of the various processes; or γ: a combination thereof. The processor includes a CPU and memory, such as a RAM and a ROM, and the memory stores program code or instructions configured to cause the CPU to execute processes. The memory, i.e., computer-readable medium, includes any readable medium that can be accessed by a general-purpose or dedicated computer.

[0029] [Pressure to hold down the second medium] The control unit 38 controls the position change unit 32 to change the pressure with which the conveying unit 31 presses the medium 17. For example, the control unit 38 may change the pressure with which the conveying unit 31 presses the medium 17 by changing the time during which the position change unit 32 transmits power to the conveying unit 31. Specifically, when the position change unit 32 transmits power to the conveying unit 31 located at the standby position WP, the conveying unit 31 moves to the conveying position TP and comes into contact with the second medium 17b, and the movement is restricted. Therefore, when the conveying unit 31 located at the conveying position TP is further pushed toward the processing tray 24, the pressure with which the conveying unit 31 presses the second medium 17b increases. Therefore, when the number and type of the first medium 17a loaded on the processing tray 24 are the same, by lengthening the time during which the position change unit 32 transmits power to the conveying unit 31, the pressure with which the first medium 17a and the second medium 17b are pressed can be increased compared to when the time for transmitting power is short.

[0030] The control unit 38 changes the pressure with which the medium 17 is pressed, based on processing information related to the processing performed on the medium 17. The processing information may include a transport time from when the recording unit 21 records on the second medium 17b to when the first discharge unit 23 discharges the second medium 17b. The transport time is the time required for the transport process of transporting the second medium 17b to the first discharge unit 23 after recording on the second medium 17b is completed. The transport unit 31 presses the second medium 17b with a pressure based on the transport time, and aligns the second medium 17b.

[0031] [Matching routine of the first embodiment] Next, the matching routine will be described with reference to the flowchart shown in Fig. 3. This matching routine is executed when a command for recording with post-processing is input.

[0032] 3, in step S101, the control unit 38 acquires processing information. That is, the control unit 38 acquires the transport time included in the processing information. In step S102, the control unit 38 compares the transport time with a transport threshold. The transport threshold is set in advance based on, for example, experimental results. If the transport time is shorter than the transport threshold, step S102 becomes YES, and the control unit 38 transitions the process to step S103. In step S103, the control unit 38 moves the transport unit 31 to the transport position TP and sets the pressure with which the transport unit 31 presses the second medium 17b to a first pressure that is smaller than the second pressure.

[0033] In step S102, if the transport time is equal to or greater than the transport threshold, step S102 becomes NO, and the control unit 38 transitions the process to step S104. In step S104, the control unit 38 moves the transport unit 31 to the transport position TP, and sets the pressure with which the transport unit 31 presses the second medium 17b to a second pressure greater than the first pressure.

[0034] In step S105, the control unit 38 aligns the second medium 17b by rotating the transport unit 31. The second medium 17b becomes the first medium 17a by being aligned. In step S106, the control unit 38 determines whether the number of first media 17a stacked on the processing tray 24 has reached the processing number, which is the unit number of sheets for post-processing. If the number of stacked sheets is insufficient for the processing number, step S106 becomes NO, and the control unit 38 proceeds to step S101. In step S101, the control unit 38 obtains the transport time for the next second medium 17b.

[0035] When the number of stacked sheets reaches the number of sheets to be processed, step S106 becomes YES, and control unit 38 transitions the process to step S107. In step S107, control unit 38 causes post-processing unit 33 to perform post-processing on the multiple first media 17a on processing tray 24. In step S108, control unit 38 sends the multiple post-processed first media 17a from processing tray 24 to stacking tray 26. As a result, the number of first media 17a stacked on processing tray 24 becomes zero.

[0036] In step S109, the control unit 38 determines whether or not recording has ended. If there is a second medium 17b that has not been discharged from the first discharge unit 23, step S109 becomes NO, and the control unit 38 transitions the process to step S101. If all of the recorded media 17 have been sent to the stacking tray 26, step S109 becomes YES, and the control unit 38 ends the alignment routine.

[0037] [Operation of the first embodiment] 2, while the first discharge unit 23 discharges the second medium 17b, the control unit 38 may stop the paddle 29 in the stopped position shown in Fig. 2. At this time, the control unit 38 may position the transport unit 31 at the transport position TP. The transport unit 31 positioned at the transport position TP sandwiches the first medium 17a between itself and the processing tray 24. This reduces the risk of the aligned first medium 17a being disturbed.

[0038] When the paddle 29 is in the stopped position, the blade 36 is positioned above the position between the pair of rollers from which the first discharge unit 23 discharges the second medium 17b. Therefore, the second medium 17b discharged from the first discharge unit 23 enters between the blade 36 and the processing tray 24.

[0039] When the rear end of second medium 17b in the first discharge direction D1 passes first discharge unit 23, control unit 38 moves transport unit 31 to standby position WP and rotates paddle 29 in the counterclockwise direction in Fig. 2. For example, control unit 38 may determine that second medium 17b has passed first discharge unit 23 when detection unit 28 changes from a state in which it detects second medium 17b to a state in which it does not detect second medium 17b. The rotating paddle 29 sends second medium 17b between transport unit 31, which is located at standby position WP, and processing tray 24.

[0040] Next, the control unit 38 controls the position change unit 32 to move the transport unit 31 to the transport position TP. The transport unit 31, located at the transport position TP, comes into contact with the upper surface of the second medium 17b placed on the processing tray 24. At this time, the control unit 38 changes the pressure with which the transport unit 31 presses the second medium 17b based on the transport time. The transport time is the time it takes to transport the recorded second medium 17b, and is also the time it takes for the liquid that adheres to the medium 17b to evaporate as a result of recording. In other words, when the transport time is short, the image recorded on the second medium 17b is not as dry as when the transport time is long, and the image is more susceptible to damage.

[0041] When the transport time is shorter than the transport threshold, the control unit 38 reduces the pressure applied to the second medium 17b compared to when the transport time is equal to or greater than the transport threshold. Specifically, when the transport time is shorter than the transport threshold, the control unit 38 sets the pressure applied to the second medium 17b to a first pressure that is smaller than the second pressure. When the transport time is equal to or greater than the transport threshold, the control unit 38 sets the pressure applied to the second medium 17b to a second pressure that is larger than the first pressure.

[0042] The control unit 38 aligns the second medium 17b by rotating the transport unit 31 located at the transport position TP. In this embodiment, the medium 17 before alignment is referred to as the second medium 17b, and the medium 17 after alignment is referred to as the first medium 17a. Therefore, the aligned first medium 17a is loaded on the processing tray 24.

[0043] If the number of first media 17a stacked on the processing tray 24 is less than the number of media to be processed, which is the unit of post-processing, the control unit 38 waits until the first discharge unit 23 discharges the next second medium 17b.

[0044] When the number of stacked sheets reaches the processing number, the control unit 38 causes the post-processing device 14 to perform post-processing. The post-processing device 33 of this embodiment staples the multiple first media 17a stacked on the processing tray 24. The control unit 38 controls the second discharge unit 25 to discharge the stack of first media 17a on the processing tray 24 to the stacking tray 26.

[0045] [Effects of the first embodiment] The effects of this embodiment will be described. (1) The control unit 38 changes the pressure with which the transport unit 31 presses the second medium 17b based on processing information related to the processing performed on the second medium 17b. Therefore, the transport unit 31 can press the second medium 17b with a pressure that matches the state of the second medium 17b, and the risk of damaging the image recorded on the second medium 17b can be reduced.

[0046] (2) The image recorded on the medium 17 dries while being transported. Therefore, if the transport time is short, the second medium 17b may be discharged from the first discharge unit 23 with the image in an insufficiently dried state. An insufficiently dried image is more susceptible to damage than an image that is sufficiently dried. When the transport time is shorter than the transport threshold, the control unit 38 reduces the pressure applied to the second medium 17b compared to when the transport time is equal to or greater than the transport threshold. In other words, the post-processing device 14 can press the second medium 17b with a pressure that matches the dryness, thereby reducing the risk of damaging the image recorded on the second medium 17b.

[0047] (3) When the transport time is equal to or longer than the threshold time, the image dries faster and is less susceptible to damage than when the transport time is shorter than the threshold time. When the transport time is equal to or longer than the transport threshold time, the control unit 38 controls the transport unit 31 to apply a second pressure that is greater than the first pressure with which the second medium 17b is pressed. Therefore, when the transport time is equal to or longer than the threshold time, the second medium 17b can be transported efficiently.

[0048] Second embodiment Next, a second embodiment of the post-processing device will be described with reference to the drawings. The second embodiment differs from the first embodiment in the alignment routine. Since the second embodiment is otherwise almost the same as the first embodiment, the same components are denoted by the same reference numerals and will not be described again.

[0049] The processing information of this embodiment includes the recording density in the recording process performed by the recording unit 21 on the medium 17. The recording density is the ratio of the area on which an image is recorded to the area of ​​the medium 17. In other words, it is the ratio of the number of dots of ink actually deposited to the maximum number of dots of ink that can be deposited on the medium 17. The processing information may include the recording densities of the upper and lower surfaces of each medium 17 individually, or may include a value calculated from the recording density.

[0050] The processing information of this embodiment includes the sum of a first recording density of the top surface of a first medium 17a placed on the processing tray 24 and a second recording density of the bottom surface of a second medium 17b discharged to the processing tray 24 by the first discharge unit 23 following the first medium 17a. When multiple first media 17a are stacked on the processing tray 24, the first recording density is the recording density of the top surface of the uppermost first medium 17a. The processing information may also include a third recording density of the top surface of the second medium 17b.

[0051] 2, the second medium 17b is transported in the alignment direction D3 with its lower surface in contact with the upper surface of the first medium 17a. Therefore, when the sum of the first and second recording densities is large, the second medium 17b is less likely to slip relative to the first medium 17a than when the sum is small. Since the transport unit 31 presses the upper surface of the second medium 17b, when the third recording density is high, the upper surface of the second medium 17b is more likely to be scratched than when the third recording density is low.

[0052] [Pressure to hold down the second medium] The position changer 32 of this embodiment can change the pressure with which the transport unit 31 presses the second medium 17b to a plurality of levels. Specifically, the transport unit 31 can press the second medium 17b with a first pressure, a second pressure, a third pressure, and a fourth pressure. The first pressure is smaller than the second pressure. The second pressure is larger than the first pressure and smaller than the third pressure. The third pressure is larger than the second pressure and smaller than the fourth pressure. The fourth pressure is larger than the third pressure. That is, of the first to fourth pressures, the first pressure is the smallest and the fourth pressure is the largest.

[0053] [Time to align secondary media] The control unit 38 may change the alignment time for conveying the second medium 17b by rotating the conveying unit 31. The control unit 38 of this embodiment can set the alignment time to a first alignment time, a second alignment time, a third alignment time, and a fourth alignment time. The first alignment time is longer than the second alignment time. The second alignment time is shorter than the first alignment time and is equal to or longer than the third alignment time. The third alignment time is equal to or shorter than the second alignment time and longer than the fourth alignment time. The fourth alignment time is shorter than the third alignment time. That is, of the first conveying time to the fourth alignment time, the first alignment time is the longest and the fourth alignment time is the shortest. The second alignment time and the third alignment time may be the same length.

[0054] [Matching routine of the second embodiment] Next, the matching routine will be described with reference to the flowchart shown in Fig. 4. This matching routine is executed when a command for recording with post-processing is input.

[0055] 4, in step S201, the control unit 38 acquires processing information. That is, the control unit 38 acquires the sum of the first and second recording densities, and the third recording density, which are included in the processing information.

[0056] In step S202, the control unit 38 compares the sum of the first and second recording densities with a sum threshold. The sum threshold is set in advance based on, for example, experimental results. If the sum is equal to or greater than the sum threshold, step S202 becomes YES, and the control unit 38 shifts the process to step S203. If the sum is lower than the sum threshold, step S202 becomes NO, and the control unit 38 shifts the process to step S204.

[0057] The control unit 38 performs the same process in steps S203 and S204. Specifically, in steps S203 and S204, the control unit 38 compares the third recording density with a density threshold value. The density threshold value is set in advance based on, for example, experimental results.

[0058] If the sum of the first and second recording densities is equal to or greater than the total threshold and the third recording density is equal to or greater than the density threshold, then steps S202 and S203 are YES. In step S205, the control unit 38 moves the transport unit 31 to the transport position TP and causes the transport unit 31 to press the second medium 17b with a first pressure. In step S206, the control unit 38 rotates the transport unit 31 for a first alignment time to align the second medium 17b.

[0059] If the sum of the first and second recording densities is equal to or greater than the total threshold value and the third recording density is lower than the density threshold value, step S202 becomes YES and step S203 becomes NO. In step S207, the control unit 38 moves the conveying unit 31 to the conveying position TP and causes the conveying unit 31 to press the second medium 17b with a second pressure. In step S208, the control unit 38 rotates the conveying unit 31 for a second alignment time to align the second medium 17b.

[0060] If the sum of the first and second recording densities is lower than the total threshold value and the third recording density is equal to or greater than the density threshold value, step S202 becomes NO and step S204 becomes YES. In step S209, the control unit 38 moves the transport unit 31 to the transport position TP and causes the transport unit 31 to press the second medium 17b with a third pressure. In step S210, the control unit 38 rotates the transport unit 31 for a third alignment time to align the second medium 17b.

[0061] If the sum of the first and second recording densities is lower than the total threshold value and the third recording density is lower than the density threshold value, steps S202 and S204 are NO. In step S211, the control unit 38 moves the transport unit 31 to the transport position TP and causes the transport unit 31 to press the second medium 17b with a fourth pressure. In step S212, the control unit 38 rotates the transport unit 31 for a fourth alignment time to align the second medium 17b.

[0062] Steps S213 to S216 are the same as steps S106 to S109 shown in FIG. 3, and therefore a description thereof will be omitted. If step S213 is NO or step S216 is NO, the control unit 38 shifts the process to step S201. In step S201, the control unit 38 acquires the total value of the first and second recording densities, and the third recording density. That is, the control unit 38 reacquires the third recording density of the upper surface of the previous second medium 17b as the first recording density of the next first medium 17a, and newly acquires the second recording density of the lower surface of the next second medium 17b and the third recording density of the upper surface of the next second medium 17b. The control unit 38 sums the new first recording density and second recording density to acquire a total value.

[0063] [Operation of the second embodiment] The operation of this embodiment will be described. The timing at which the control unit 38 rotates the paddle 29 and the timing at which the transport unit 31 moves are the same as those in the first embodiment, and therefore a description thereof will be omitted.

[0064] The control unit 38 changes the pressure with which the conveying unit 31 presses the second medium 17b when aligning the second medium 17b and the time taken for the alignment based on the first recording density, the second recording density, and the third recording density.

[0065] When the sum of the first and second recording densities is equal to or greater than the total threshold, the control unit 38 applies less pressure to the second medium 17b than when the sum is less than the total threshold. When the third recording density is equal to or greater than the density threshold, the control unit 38 extends the alignment time for aligning the second medium 17b than when the third recording density is less than the density threshold.

[0066] Specifically, in a first case where the sum of the first and second recording densities is equal to or greater than the total threshold value and the third recording density is equal to or greater than the density threshold value, the control unit 38 sets the pressure pressing the second medium 17b to the first pressure. In this first case, the control unit 38 sets the alignment time during which the conveying unit 31 conveys the second medium 17b to the first alignment time, which is longer than the second alignment time.

[0067] In a second case where the sum of the first and second recording densities is equal to or greater than the total threshold value and the third recording density is lower than the density threshold value, the control unit 38 sets the pressure pressing the second medium 17b to the second pressure. In this second case, the control unit 38 sets the alignment time during which the conveying unit 31 conveys the second medium 17b to the second alignment time.

[0068] In a third case where the sum of the first and second recording densities is lower than the total threshold value and the third recording density is equal to or greater than the density threshold value, the control unit 38 sets the pressure pressing the second medium 17b to a third pressure. In this third case, the control unit 38 sets the alignment time during which the conveying unit 31 conveys the second medium 17b to a third alignment time.

[0069] In a fourth case where the sum of the first and second recording densities is lower than the total threshold value and the third recording density is lower than the density threshold value, the control unit 38 sets the pressure pressing the second medium 17b to a fourth pressure. In this fourth case, the control unit 38 sets the alignment time during which the conveying unit 31 conveys the second medium 17b to the fourth alignment time.

[0070] [Effects of the second embodiment] The effects of this embodiment will be described. (4) The slipperiness of the second medium 17b relative to the first medium 17a varies depending on the recording density of the surfaces in contact with each other. Specifically, when the sum of the first and second recording densities is large, the first and second mediums 17a and 17b are less likely to slip and the image is more likely to be scratched than when the sum is small. In this regard, when the sum of the first and second recording densities is equal to or greater than the total threshold, the control unit 38 reduces the pressure applied to the medium 17 compared to when the sum is less than the total threshold. This reduces the risk of scratching the image recorded on the medium 17.

[0071] (5) The transport unit 31 transports the second medium 17b by contacting the upper surface of the second medium 17b discharged by the discharge unit. Therefore, the transport unit 31 is more likely to damage the image when the third recording density is high than when the third recording density is low. In this regard, when the third recording density is equal to or higher than the density threshold, the control unit 38 reduces the pressure applied to the second medium 17b compared to when the third recording density is lower than the density threshold. Therefore, the risk of damaging the image recorded on the second medium 17b can be reduced.

[0072] (6) The transport unit 31 transports and aligns the second medium 17b. When the alignment time during which the transport unit 31 transports the second medium 17b is long, alignment is higher than when it is short. However, when the alignment time is long, there is a higher risk of damaging the image. In the first case, the second medium 17b is transported for a first alignment time that is longer than the second alignment time. The first pressure that presses the second medium 17b in the first case is smaller than the second pressure that presses the second medium 17b in the second case. Therefore, by using a small pressure and a long alignment time, it is possible to improve alignment while suppressing damage to the image.

[0073] (7) The third pressure that presses the second medium 17b in the third case is smaller than the fourth pressure that presses the second medium 17b in the fourth case. Therefore, in the third case, the image is less likely to be damaged than in the fourth case. In the third case, the second medium 17b is transported for a third alignment time that is longer than the fourth alignment time. Therefore, the post-processing device 14 can increase alignment while suppressing damage to the image.

[0074] Third embodiment Next, a third embodiment of the post-processing device will be described with reference to the drawings. The third embodiment differs from the first and second embodiments in the alignment routine. Since the third embodiment is otherwise almost the same as the first and second embodiments, the same components are denoted by the same reference numerals and a duplicated description will be omitted.

[0075] 2, the post-processing unit 33 can execute a first process or a second process on the first medium 17a. In this embodiment, the first process is a staple process. In this embodiment, the second process is a shift process.

[0076] The processing information of this embodiment includes post-processing information related to processing performed by post-processing unit 33 on first medium 17a. That is, the post-processing information indicates whether a first processing or a second processing is to be performed on first medium 17a. The processing information may include a third recording density of the top surface of second medium 17b discharged to processing tray 24 by first discharge unit 23.

[0077] [Matching routine of the third embodiment] Next, the matching routine will be described with reference to the flowchart shown in Fig. 5. This matching routine is executed when a command for recording with post-processing is input.

[0078] 5, in step S301, the control unit 38 acquires processing information. That is, the control unit 38 acquires post-processing information and a third recording density included in the processing information. In step S302, the control unit 38 determines whether the acquired post-processing information causes the first processing or the second processing to be executed.

[0079] If the post-processing information is for executing the first process, step S302 becomes YES, and the control unit 38 shifts the process to step S303. If the post-processing information is for executing the second process, step S302 becomes NO, and the control unit 38 shifts the process to step S311.

[0080] Steps S303 to S307 are the same as steps S203, S205, S207, S206, and S213 shown in FIG. 4, and therefore the description thereof will be omitted. In step S308, the control unit 38 causes the post-processing unit 33 to execute a first process.

[0081] Steps S309 and S310 are the same as steps S215 and S216 shown in FIG. 4, and therefore a description thereof will be omitted. Steps S311 to S315 are the same as steps S204, S209, S211, S208, and S213 shown in FIG. 4, and therefore the description thereof will be omitted.

[0082] In step S316, the control unit 38 causes the post-processing unit 33 to execute the second process. If steps S307, S310, and S315 are NO, the control unit 38 transitions the process to step S301. In step S301, the control unit 38 acquires post-processing information and a third recording density. That is, the control unit 38 acquires information on the post-processing to be performed on the next second medium 17b and the third recording density of the upper surface of the next second medium 17b.

[0083] [Operation of the third embodiment] The operation of this embodiment will be described. The timing at which the control unit 38 rotates the paddle 29 and the timing at which the transport unit 31 moves are the same as those in the first embodiment, and therefore a description thereof will be omitted.

[0084] The stapling process, which is the first process of this embodiment, is a process of binding a plurality of first media 17a with staples. When performing the first process, the plurality of first media 17a are bound by staples, and therefore the first media 17a cannot be realigned after processing. Therefore, high alignment is required for the first media 17a to be stapled.

[0085] The shift process, which is the second process of this embodiment, is a process of shifting the position of a stack of first media 17a corresponding to the number of sheets to be processed for each stack. For example, the post-processing unit 33 shifts every other stack of first media 17a in the width direction X. The second discharge unit 25 discharges the first media 17a in the second discharge direction D2 while keeping the stack in the position shifted by the post-processing unit 33. When the first media 17a are placed on the stacking tray 26, they become third media 17c. On the stacking tray 26, stacks of third media 17c at the reference position and stacks of third media 17c at a position shifted from the reference position in the width direction X are stacked alternately.

[0086] In the shift process, the first media 17a constituting the stack are stacked on the stacking tray 26 without being constrained, and become the third media 17c. The third media 17c can be realigned. Therefore, the alignment required for the first media 17a to be shifted is lower than that required for the staple process.

[0087] When the first process is executed, the control unit 38 reduces the pressure applied to the second medium 17b compared to when the second process is executed, and lengthens the alignment time during which the transport unit 31 transports the medium 17. When the third recording density is equal to or greater than the density threshold, the control unit 38 reduces the pressure applied to the second medium 17b by the transport unit 31 compared to when the third recording density is lower than the density threshold.

[0088] Specifically, when the post-processing unit 33 performs the first processing and the third recording density is equal to or greater than the density threshold value, the control unit 38 controls the pressure applied to the second medium 17b to be the first pressure which is smaller than the second pressure.

[0089] When the post-processing unit 33 performs the first process and the third recording density is lower than the density threshold value, the control unit 38 controls the pressure applied to the second medium 17b to be a second pressure that is greater than the first pressure.

[0090] When the post-processing unit 33 performs the second process and the third recording density is equal to or greater than the density threshold value, the control unit 38 controls the pressure applied to the second medium 17b to be a third pressure that is smaller than the fourth pressure.

[0091] When the post-processing unit 33 performs the second process and the third recording density is lower than the density threshold value, the control unit 38 causes the pressure pressing the second medium 17b to be a fourth pressure that is greater than the third pressure.

[0092] The control unit 38 rotates the transport unit 31, which presses the second medium 17b with a set pressure, for a time that matches the processing performed by the post-processing unit 33. That is, when the post-processing unit 33 performs the first processing, the control unit 38 transports the second medium 17b in the alignment direction D3 for the first alignment time. When the post-processing unit 33 performs the second processing, the control unit 38 transports the second medium 17b in the alignment direction D3 for the second alignment time. The first transport time is longer than the second transport time. Therefore, the first medium 17a that is subjected to the first processing is aligned more precisely than the second medium 17b that is subjected to the second processing.

[0093] [Effects of the third embodiment] The effects of this embodiment will be described. (8) When the first process is performed, the control unit 38 reduces the pressure applied to the second medium 17b compared to when the second process is performed, and lengthens the alignment time during which the transport unit 31 transports the second medium 17b. The level of alignment varies depending on the length of the alignment time. Specifically, a long alignment time provides higher alignment than a short alignment time. When the first process is performed, the pressure applied to the second medium 17b is reduced compared to when the second process is performed. Therefore, even if the time required to transport the second medium 17b is long, damage to the image can be suppressed.

[0094] (9) When the third recording density is equal to or greater than the density threshold, the control unit 38 applies less pressure to the second medium 17b than when the third recording density is less than the density threshold. This reduces the risk of damaging the image recorded on the second medium 17b.

[0095] (Fourth embodiment) Next, a fourth embodiment of the post-processing device will be described with reference to the drawings. The fourth embodiment differs from the first to third embodiments in the alignment routine. Since the fourth embodiment is otherwise almost the same as the first to third embodiments, the same components are denoted by the same reference numerals and a duplicated description will be omitted.

[0096] The processing information of this embodiment includes humidity information related to humidity. For example, the humidity information is the ratio of the amount of water vapor contained in the air to the amount of saturated water vapor. The amount of saturated water vapor changes depending on the temperature. Therefore, the processing information may include temperature information related to the temperature of the environment in which the post-processing device 14 is installed. When the temperature is high, the amount of saturated water vapor is greater than when the temperature is low. When the humidity is high, the amount of water vapor is greater than when the humidity is low. Therefore, when the temperature and humidity are high, the amount of water vapor contained in the air is greater than when the temperature and humidity are low.

[0097] The post-processing device 14 may include a measuring device (not shown) capable of measuring at least one of temperature and humidity. The measuring device may be provided separately from the post-processing device 14. The temperature information and humidity information may be input by operating the operation unit 18. The control unit 38 may obtain the temperature information and humidity information from the measuring device, the operation unit 18, and an external device such as a server.

[0098] [Matching routine of the fourth embodiment] Next, the matching routine will be described with reference to the flowchart shown in Fig. 6. This matching routine is executed when a command for recording with post-processing is input.

[0099] In step S401, the control unit 38 acquires processing information, that is, the control unit 38 acquires temperature information and humidity information. In step S402, the control unit 38 compares the temperature with the temperature threshold. The temperature threshold is set in advance based on, for example, experimental results. If the temperature is equal to or higher than the temperature threshold, step S402 becomes YES, and the control unit 38 shifts the process to step S403. If the temperature is lower than the temperature threshold, step S402 becomes NO, and the control unit 38 shifts the process to step S404.

[0100] The control unit 38 performs the same process in steps S403 and S404. Specifically, in steps S403 and S404, the control unit 38 compares the humidity with a humidity threshold value. The humidity threshold value is set in advance based on, for example, experimental results.

[0101] If the temperature is equal to or higher than the temperature threshold and the humidity is equal to or higher than the humidity threshold, then steps S402 and S403 are YES. In step S405, the control unit 38 sets the pressure with which the conveyance unit 31 presses the second medium 17b to the first pressure.

[0102] If the temperature is equal to or higher than the temperature threshold and the humidity is lower than the humidity threshold, step S402 becomes YES and step S403 becomes NO. In step S406, the control unit 38 sets the pressure with which the conveying unit 31 presses the second medium 17b to a second pressure.

[0103] If the temperature is lower than the temperature threshold and the humidity is equal to or higher than the humidity threshold, step S402 becomes NO and step S404 becomes YES. In step S407, the control unit 38 sets the pressure with which the conveying unit 31 presses the second medium 17b to a third pressure.

[0104] If the temperature is lower than the temperature threshold and the humidity is lower than the humidity threshold, the results in steps S402 and S404 are NO. In step S408, the control unit 38 sets the pressure with which the transport unit 31 presses the second medium 17b to a fourth pressure.

[0105] In step S409, the control unit 38 controls the position change unit 32 to move the transport unit 31 to the transport position TP. That is, the transport unit 31 presses the second medium 17b with the pressure set in steps S405 to S408. Steps S410 to S414 are the same as steps S105 to S109 shown in FIG. 3, and therefore description thereof will be omitted.

[0106] If step S411 or step S414 is NO, the control unit 38 transitions the process to step S409. In step S409, the control unit 38 moves the conveying unit 31 to the conveying position TP so that the conveying unit 31 presses the next second medium 17b with the set pressure.

[0107] [Operation of the fourth embodiment] The operation of this embodiment will be described. The timing at which the control unit 38 rotates the paddle 29 and the timing at which the transport unit 31 moves are the same as those in the first embodiment, and therefore a description thereof will be omitted.

[0108] For example, if the medium 17 is hygroscopic, the medium 17 absorbs water vapor in the air. When the amount of water vapor in the air is high, the medium 17 absorbs more water vapor than when the amount of water vapor is low. When the medium 17 is wet from absorbing water vapor, liquid that adheres to the medium 17 during recording tends to remain on the surface. In other words, liquid is less likely to penetrate the medium 17. If the transport unit 31 comes into contact with the medium 17 when the surface is wet with liquid, the image is likely to be scratched. In other words, when the amount of water vapor in the air is high and the medium 17 is wet, the image is more likely to be scratched than when the amount of water vapor is low and the medium 17 is dry.

[0109] The control unit 38 reduces the pressure applied to the second medium 17b when the humidity is equal to or higher than the humidity threshold value, compared to when the humidity is lower than the humidity threshold value. The control unit 38 may reduce the pressure applied to the second medium 17b when the air temperature is equal to or higher than the air temperature threshold value, compared to when the air temperature is lower than the air temperature threshold value. The control unit 38 may change the pressure applied by the conveying unit 31 to the second medium 17b when aligning the second medium 17b, based on the air temperature and humidity at which the post-processing device 14 is installed.

[0110] When the temperature is equal to or higher than the temperature threshold and the humidity is equal to or higher than the humidity threshold, the control unit 38 controls the pressure applied to the second medium 17b to be the first pressure. The first pressure is the smallest of the first to fourth pressures.

[0111] When the temperature is equal to or higher than the temperature threshold and the humidity is lower than the humidity threshold, the control unit 38 controls the pressure applied to the second medium 17b to be the second pressure. The second pressure is greater than the first pressure and less than the third pressure.

[0112] When the temperature is lower than the temperature threshold and the humidity is equal to or higher than the humidity threshold, the control unit 38 controls the pressure applied to the second medium 17b to be the third pressure. The third pressure is greater than the second pressure and less than the fourth pressure.

[0113] When the temperature is lower than the temperature threshold and the humidity is lower than the humidity threshold, the control unit 38 controls the pressure applied to the second medium 17b to be the fourth pressure. The fourth pressure is the largest among the first pressure to the fourth pressure.

[0114] [Effects of the fourth embodiment] The effects of this embodiment will be described. (10) In the case of a moisture-absorbing medium 17, the medium may absorb water vapor in the air, making it difficult for liquid attached by recording to penetrate. In other words, when there is a large amount of water vapor in the air, the liquid is less likely to penetrate than when there is a small amount of water vapor, and the image is more likely to be damaged. In this regard, when the humidity is equal to or higher than the humidity threshold, the control unit 38 reduces the force pressing down on the second medium 17b compared to when the humidity is lower than the humidity threshold. This reduces the risk of damaging the image recorded on the second medium 17b.

[0115] Fifth embodiment Next, a fifth embodiment of the post-processing device will be described with reference to the drawings. The fifth embodiment differs from the first to fourth embodiments in the alignment routine. Since the fifth embodiment is otherwise almost the same as the first to fourth embodiments, the same components are denoted by the same reference numerals and a duplicated description will be omitted.

[0116] The processing information of this embodiment includes recording surface information regarding the recorded surface of the medium 17. The recording surface information indicates whether recording has been performed on both sides of the medium 17 or on one side, and if recording has been performed on one side, which side it has been recorded on.

[0117] [Matching routine of the fifth embodiment] Next, the matching routine will be described with reference to the flowchart shown in Fig. 7. This matching routine is executed when a command for recording with post-processing is input.

[0118] 7, in step S501, the control unit 38 acquires processing information. That is, the control unit 38 acquires recording surface information included in the processing information. In step S502, the control unit 38 determines whether or not recording has been performed on the top surface of the second medium 17b discharged from the first discharge unit 23. If recording has been performed on both sides of the second medium 17b, or if the second medium 17b with recording on one side is discharged with the recorded side facing up, step S502 becomes YES, and the control unit 38 proceeds to step S503.

[0119] If the second medium 17b, which has been recorded on one side, is discharged with the recorded side facing down, step S502 becomes NO, and the control unit 38 moves the process to step S504. Steps S503 to S509 are the same as steps S103 to S109 shown in FIG. 3, and therefore the description thereof will be omitted.

[0120] [Operation of the fifth embodiment] The operation of this embodiment will be described. The timing at which the control unit 38 rotates the paddle 29 and the timing at which the transport unit 31 moves are the same as those in the first embodiment, and therefore a description thereof will be omitted.

[0121] The control unit 38 changes the pressure with which the transport unit 31 presses the second medium 17b when aligning the second medium 17b depending on whether the top surface of the second medium 17b pressed by the transport unit 31 is a recorded surface or not. If the top surface of the second medium 17b pressed by the transport unit 31 is a recorded surface, the image is more likely to be scratched than if the top surface is not a recorded surface. Therefore, the control unit 38 reduces the pressure with which the transport unit 31 presses the second medium 17b when the top surface is a recorded surface.

[0122] Specifically, when recording has been performed on the upper surface of the second medium 17b that the transport unit 31 contacts, the control unit 38 controls the pressure pressing the second medium 17b to a first pressure that is smaller than the second pressure. When recording has not been performed on the upper surface of the second medium 17b that the transport unit 31 contacts, the control unit 38 controls the pressure pressing the second medium 17b to a second pressure that is larger than the first pressure.

[0123] [Effects of the fifth embodiment] The effects of this embodiment will be described. (11) The transport unit 31 transports the second medium 17b in contact with the upper surface of the second medium 17b. Therefore, when recording is performed on the upper surface of the second medium 17b, the recorded image is easily scratched. In this regard, when recording is performed on the upper surface of the second medium 17b, the control unit 38 reduces the pressure with which the second medium 17b is pressed when recording is performed on the upper surface of the second medium 17b compared to when recording is not performed on the upper surface of the second medium 17b. In other words, the post-processing device 14 can press the second medium 17b with a pressure according to the second medium 17b on which recording is performed, and can reduce the risk of scratching the image recorded on the second medium 17b.

[0124] This embodiment can be modified as follows: This embodiment and the following modifications can be combined with each other to the extent that there is no technical contradiction. The processing information may include thickness information regarding the thickness of medium 17. The thickness information may be a numerical value indicating the degree of thickness of medium 17, or may be the basis weight of medium 17. When medium 17 is thick, control unit 38 may apply less pressure to press second medium 17b than when medium 17 is thin.

[0125] The processing information may include size information regarding the size of the medium 17. The size information may be at least one of the vertical and horizontal dimensions of the medium 17, or may be a standard size such as A4 or A3. The control unit 38 may change the pressure with which the second medium 17b is pressed depending on the size. For example, the control unit 38 may apply less pressure to the medium 17 when the size of the medium 17 is small than when the size of the medium 17 is large. A medium 17 with a small size is more easily transported by the transport unit 31 than a medium 17 with a large size. Therefore, a medium 17 with a small size can be transported even with a smaller pressure.

[0126] The processing information may include resolution information regarding the resolution of the image to be recorded. When the resolution is high, the size of the droplets discharged by the recording unit 21 is smaller and the number of droplets discharged is greater than when the resolution is low. Therefore, when the resolution is high, the recording time required for recording is longer, and the transport time can be lengthened according to the recording time. Therefore, when the resolution is low and the transport time is short, the pressure pressing the second medium 17b may be smaller than when the resolution is high and the transport time is long.

[0127] The processing information may include water vapor amount information regarding the amount of water vapor in the air. The water vapor amount is the amount of water vapor per unit volume. When the amount of water vapor in the air is equal to or greater than the water vapor threshold, the control unit 38 may reduce the pressure applied to the second medium 17b compared to when the amount of water vapor is lower than the water vapor threshold. The control unit 38 may calculate the amount of water vapor from the humidity. The control unit 38 may calculate the amount of water vapor from the temperature and the humidity. The water vapor threshold may be a value calculated from the humidity threshold and the temperature threshold.

[0128] In the third embodiment, the post-processing unit 33 may perform a punching process as the first process and a shifting process as the second process. The post-processing unit 33 may perform a stapling process as the first process and a punching process as the second process.

[0129] In the third embodiment, the processing information does not have to include the third recording density. The control unit 38 may change the pressure with which the second medium 17b is pressed based on the post-processing information. In the second to fourth embodiments, the second pressure and the third pressure may be the same.

[0130] In the second to fourth embodiments, the first pressure and the third pressure may be the same. The second pressure and the fourth pressure may be the same. In the second embodiment, the control unit 38 may set the alignment time during which the transport unit 31 transports the second medium 17b regardless of the recording density of the first medium 17a and the second medium 17b.

[0131] In the second embodiment, the processing information may include a first recording density and a second recording density. The control unit 38 may calculate the sum of the first recording density and the second recording density during the process of executing the matching routine.

[0132] In the second embodiment, the processing information does not have to include the third recording density. The control unit 38 may change the pressure with which the second medium 17b is pressed based on the sum of the first recording density and the second recording density.

[0133] The liquid can be selected arbitrarily as long as it can be attached to the medium 17 and record on the medium 17. For example, the ink includes a material in which particles of a functional material made of solid matter such as a pigment or metal particles are dissolved, dispersed or mixed in a solvent, and includes various compositions such as water-based ink, oil-based ink, gel ink, and hot melt ink.

[0134] The technical ideas and effects obtained from the above-described embodiment and modified examples will be described below. (A) The post-processing device includes a discharge unit that discharges a medium recorded by a recording unit that records by ejecting a liquid, a processing tray that loads the medium discharged by the discharge unit, an end alignment unit provided on the processing tray that aligns an end of the medium, a transport unit that contacts the top surface of the medium placed on the processing tray and transports the medium to the end alignment unit, a position change unit that changes the relative position of the transport unit with respect to the processing tray, a control unit that controls the position change unit to change the pressure with which the transport unit presses the medium, and a post-processing unit that performs post-processing on the medium on the processing tray, and the control unit changes the pressure based on processing information related to the processing to be performed on the medium.

[0135] According to this configuration, the control unit changes the pressure with which the transport unit presses the medium based on the processing information related to the processing performed on the medium, so that the transport unit can press the medium with a pressure that matches the condition of the medium, reducing the risk of damaging the image recorded on the medium.

[0136] (B) In a post-processing device, the processing information includes a transport time from when the recording unit records on the medium to when the discharge unit discharges the medium, and the control unit causes the pressure to be a first pressure when the transport time is shorter than a transport threshold, and causes the pressure to be a second pressure when the transport time is equal to or greater than the transport threshold, the first pressure being smaller than the second pressure.

[0137] The image recorded on the medium dries while being transported. Therefore, if the transport time is short, the medium may be discharged from the discharge section with the image in an insufficiently dried state. An insufficiently dried image is more susceptible to damage than an image that is sufficiently dried. With this configuration, when the transport time is shorter than the transport threshold, the control unit reduces the pressure applied to press the medium compared to when the transport time is equal to or greater than the transport threshold. In other words, the post-processing device can press the medium with a pressure that matches the dryness, reducing the risk of damaging the image recorded on the medium.

[0138] (C) In a post-processing device, the processing information includes a sum of a first recording density of an upper surface of a first medium placed on the processing tray and a second recording density of a lower surface of a second medium discharged to the processing tray by the discharge unit following the first medium, and the control unit may reduce the pressure when the sum is equal to or greater than a sum threshold value compared to when the sum is lower than the sum threshold value.

[0139] The slipperiness of the second medium relative to the first medium varies depending on the recording density of the surfaces that contact each other. Specifically, when the sum of the first and second recording densities is large, the first and second media are less likely to slip and the image is more likely to be scratched than when the sum is small. In this regard, with this configuration, when the sum of the first and second recording densities is equal to or greater than the total threshold, the control unit applies less pressure to press the medium than when the sum is less than the total threshold. This reduces the risk of scratching the image recorded on the medium.

[0140] (D) In ​​the post-processing device, the processing information further includes a third recording density of the upper surface of the second medium, and the control unit causes the pressure to be a first pressure in a first case in which the sum value is greater than or equal to the sum threshold value and the third recording density is greater than or equal to a density threshold value, and causes the pressure to be a second pressure in a second case in which the sum value is greater than or equal to the sum threshold value and the third recording density is lower than the density threshold value, and the first pressure may be smaller than the second pressure.

[0141] The conveying unit conveys the second medium by contacting the upper surface of the second medium discharged by the discharge unit. Therefore, when the third recording density is high, the conveying unit is more likely to damage the image than when the third recording density is low. In this respect, according to this configuration, when the third recording density is equal to or higher than the density threshold, the control unit applies less pressure to press the medium than when the third recording density is lower than the density threshold. Therefore, the risk of damaging the image recorded on the medium can be reduced.

[0142] (E) In the post-processing device, the processing information may further include a third recording density of the upper surface of the second medium, and the control unit may set the pressure to a third pressure in a third case where the sum is lower than the total threshold value and the third recording density is equal to or higher than the density threshold value, and set the pressure to a fourth pressure in a fourth case where the sum is lower than the total threshold value and the third recording density is lower than the density threshold value, the third pressure being smaller than the fourth pressure. With this configuration, it is possible to achieve the same effect as the post-processing device described above.

[0143] (F) In the post-processing device, the control unit may set the alignment time for the transport unit to transport the second medium to a first alignment time in the first case and to a second alignment time in the second case, the first alignment time being longer than the second alignment time.

[0144] The transport unit transports and aligns the medium. When the alignment time during which the transport unit transports the medium is long, alignment is higher than when it is short. However, when the alignment time is long, there is a higher risk of damaging the image. With this configuration, in the first case, the second medium is transported for a first alignment time that is longer than the second alignment time. The first pressure that holds the second medium in the first case is smaller than the second pressure that holds the second medium in the second case. Therefore, by using a small pressure and a long alignment time, it is possible to increase alignment while suppressing damage to the image.

[0145] (G) In the post-processing device, the control unit may set the alignment time for the transport unit to transport the second medium to a third alignment time in the third case and to a fourth alignment time in the fourth case, the third alignment time being longer than the fourth alignment time.

[0146] The third pressure pressing the second medium in the third case is smaller than the fourth pressure pressing the second medium in the fourth case. Therefore, in the third case, the image is less likely to be damaged than in the fourth case. With this configuration, in the third case, the second medium is transported for the third alignment time that is longer than the fourth alignment time. Therefore, the post-processing device can increase alignment while suppressing damage to the image.

[0147] (H) In the post-processing device, the post-processing unit is capable of performing a first process or a second process on the medium, the processing information includes post-processing information regarding the processing performed by the post-processing unit on the medium, and when the first process is executed, the control unit may reduce the pressure compared to when the second process is executed, and may lengthen the alignment time for the transport unit to transport the medium.

[0148] According to this configuration, when the first process is performed, the control unit reduces the pressure applied to the medium compared to when the second process is performed, and lengthens the alignment time during which the transport unit transports the medium. The level of alignment varies depending on the length of the alignment time. Specifically, when the alignment time is long, the alignment is higher than when the alignment time is short. When the first process is performed, the pressure applied to the medium is reduced compared to when the second process is performed. Therefore, even when the time required to transport the medium is long, damage to the image can be suppressed.

[0149] (I) In a post-processing device, the processing information further includes a recording density of the top surface of the medium discharged to the processing tray by the discharge unit, and the control unit causes the pressure to be a first pressure when the post-processing unit performs the first processing and the recording density is equal to or greater than a density threshold, and causes the pressure to be a second pressure when the post-processing unit performs the first processing and the recording density is lower than the density threshold, and the first pressure may be smaller than the second pressure.

[0150] According to this configuration, when the recording density is equal to or higher than the density threshold, the control unit applies less pressure to the medium than when the recording density is lower than the density threshold, thereby reducing the risk of damaging the image recorded on the medium.

[0151] (J) In the post-processing device, the processing information may further include a recording density of the upper surface of the medium discharged to the processing tray by the discharge unit, and the control unit may set the pressure to a third pressure when the post-processing unit performs the second processing and the recording density is equal to or greater than a density threshold, and set the pressure to a fourth pressure when the post-processing unit performs the second processing and the recording density is lower than the density threshold, the third pressure being smaller than the fourth pressure. With this configuration, it is possible to achieve the same effect as the post-processing device described above.

[0152] (K) In the post-processing device, the processing information may include humidity information regarding humidity, and the control unit may reduce the pressure when the humidity is equal to or greater than a humidity threshold value compared to when the humidity is lower than the humidity threshold value.

[0153] In the case of a hygroscopic medium, the medium may absorb water vapor in the air, making it difficult for the liquid attached by recording to penetrate. In other words, when there is a large amount of water vapor in the air, the liquid is less likely to penetrate than when there is a small amount of water vapor, and the image is more likely to be damaged. In this regard, with this configuration, when the humidity is equal to or higher than the humidity threshold, the control unit reduces the force pressing down on the medium compared to when the humidity is lower than the humidity threshold. Therefore, the risk of damaging the image recorded on the medium can be reduced.

[0154] (L) In a post-processing device, the processing information includes recording surface information regarding the recorded surface of the medium, and the control unit causes the pressure to be a first pressure when recording has been performed on the top surface of the medium that the transport unit contacts, and causes the pressure to be a second pressure when recording has not been performed on the top surface of the medium that the transport unit contacts, the first pressure being smaller than the second pressure.

[0155] The transport unit transports the medium by contacting the upper surface of the medium. Therefore, when recording is performed on the upper surface of the medium, the recorded image is easily scratched. In this regard, according to this configuration, when recording is performed on the upper surface of the medium, the control unit applies less pressure to press the medium than when recording is not performed on the upper surface of the medium. In other words, the post-processing device can press the medium with a pressure that corresponds to the medium on which recording is performed, and the risk of scratching the image recorded on the medium can be reduced. [Explanation of symbols]

[0156] 11...recording system, 12...recording device, 13...intermediate device, 14...post-processing device, 15...center folding device, 17...medium, 17a...first medium, 17b...second medium, 17c...third medium, 18...operation unit, 19...medium storage unit, 21...recording unit, 23...first discharge unit which is an example of a discharge unit, 24...processing tray, 25...second discharge unit, 26...loading tray, 28...detection unit, 29...paddle, 30...end alignment unit, 31...conveying unit, 32...position change unit, 33...post-processing unit, 35...rotating shaft, 36...blade, 38...control unit, D1...first discharge direction, D2...second discharge direction, D3...alignment direction, TP...conveying position, WP...waiting position, X...width direction, Y...conveying direction, Z...vertical direction.

Claims

1. a discharge unit that discharges a medium recorded by a recording unit that performs recording by discharging a liquid; a processing tray that holds the medium discharged by the discharge unit; an edge alignment portion provided on the processing tray and configured to align an edge of the medium; a transport section that contacts an upper surface of the medium placed on the processing tray and transports the medium to the edge alignment section; a position changing unit that changes a relative position of the transport unit with respect to the processing tray; a control unit that controls the position change unit to change the pressure with which the transport unit presses the medium; a post-processing section for performing post-processing on the medium on the processing tray; Equipped with The control unit changes the pressure based on processing information related to a processing performed on the medium, the processing information includes a transport time from when the recording unit records on the medium to when the discharge unit discharges the medium, The control unit is if the delivery time is less than a delivery threshold, causing the pressure to be a first pressure; if the transport time is equal to or greater than the transport threshold, causing the pressure to be a second pressure; The post-treatment device, wherein the first pressure is smaller than the second pressure.

2. a discharge unit that discharges a medium recorded by a recording unit that performs recording by discharging a liquid; a processing tray that holds the medium discharged by the discharge unit; an edge alignment portion provided on the processing tray and configured to align an edge of the medium; a transport section that contacts an upper surface of the medium placed on the processing tray and transports the medium to the edge alignment section; a position changing unit that changes a relative position of the transport unit with respect to the processing tray; a control unit that controls the position change unit to change the pressure with which the transport unit presses the medium; a post-processing section for performing post-processing on the medium on the processing tray; Equipped with The control unit changes the pressure based on processing information related to a processing performed on the medium, the processing information includes a sum of a first recording density of an upper surface of a first medium placed on the processing tray and a second recording density of a lower surface of a second medium discharged to the processing tray by the discharge unit following the first medium, The post-processing device according to claim 1, wherein the control unit reduces the pressure when the total value is equal to or greater than a total threshold value, compared to when the total value is lower than the total threshold value.

3. the processing information further includes a third recording density of the upper surface of the second medium; The control unit is In a first case where the sum is equal to or greater than the sum threshold value and the third recording density is equal to or greater than a density threshold value, the pressure is set to a first pressure; In a second case where the sum is equal to or greater than the sum threshold value and the third recording density is lower than the density threshold value, the pressure is made to be a second pressure; The post-treatment device according to claim 2 , wherein the first pressure is smaller than the second pressure.

4. the processing information further includes a third recording density of the upper surface of the second medium; The control unit is in a third case where the sum is less than the sum threshold value and the third recording density is equal to or greater than a density threshold value, the pressure is made to be a third pressure; in a fourth case where the sum is lower than the sum threshold value and the third recording density is lower than the density threshold value, the pressure is made to be a fourth pressure; 4. The post-treatment device according to claim 2, wherein the third pressure is smaller than the fourth pressure.

5. The control unit is configured to set a matching time during which the transport unit transports the second medium. In the first case, a first matching time is set; In the second case, a second matching time is set; 4. The post-processing device according to claim 3, wherein the first matching time is longer than the second matching time.

6. The control unit is configured to set a matching time during which the transport unit transports the second medium. In the third case, a third matching time is set; In the fourth case, a fourth matching time is set; The post-processing device according to claim 4 , wherein the third matching time is longer than the fourth matching time.

7. a discharge unit that discharges a medium recorded by a recording unit that performs recording by discharging a liquid; a processing tray that holds the medium discharged by the discharge unit; an edge alignment portion provided on the processing tray and configured to align an edge of the medium; a transport section that contacts an upper surface of the medium placed on the processing tray and transports the medium to the edge alignment section; a position changing unit that changes a relative position of the transport unit with respect to the processing tray; a control unit that controls the position change unit to change the pressure with which the transport unit presses the medium; a post-processing section for performing post-processing on the medium on the processing tray; Equipped with The control unit changes the pressure based on processing information related to a processing performed on the medium, the post-processing unit is capable of executing a first process or a second process on the medium; the processing information includes post-processing information regarding processing performed by the post-processing unit on the medium, The control unit, when executing the first process, reduces the pressure more than when executing the second process, and lengthens the alignment time for the transport unit to transport the medium.

8. the processing information further includes a recording density of an upper surface of the medium discharged to the processing tray by the discharge unit; The control unit is When the post-processing unit performs the first process and the recording density is equal to or greater than a density threshold value, the pressure is set to a first pressure; When the post-processing section performs the first process and the recording density is lower than the density threshold value, the pressure is set to a second pressure; The post-treatment device according to claim 7 , wherein the first pressure is less than the second pressure.

9. the processing information further includes a recording density of an upper surface of the medium discharged to the processing tray by the discharge unit; The control unit is When the post-processing unit performs the second process and the recording density is equal to or greater than a density threshold value, the pressure is set to a third pressure; When the post-processing unit performs the second process and the recording density is lower than the density threshold value, the pressure is set to a fourth pressure; 9. The post-treatment device according to claim 7, wherein the third pressure is smaller than the fourth pressure.

10. a discharge unit that discharges a medium recorded by a recording unit that performs recording by discharging a liquid; a processing tray that holds the medium discharged by the discharge unit; an edge alignment portion provided on the processing tray and configured to align an edge of the medium; a transport section that contacts an upper surface of the medium placed on the processing tray and transports the medium to the edge alignment section; a position changing unit that changes a relative position of the transport unit with respect to the processing tray; a control unit that controls the position change unit to change the pressure with which the transport unit presses the medium; a post-processing section for performing post-processing on the medium on the processing tray; Equipped with The control unit changes the pressure based on processing information related to a processing performed on the medium, the processing information includes humidity information relating to humidity; The post-processing device, wherein the control unit reduces the pressure when the humidity is equal to or higher than a humidity threshold value, compared to when the humidity is lower than the humidity threshold value.

11. a discharge unit that discharges a medium recorded by a recording unit that performs recording by discharging a liquid; a processing tray that holds the medium discharged by the discharge unit; an edge alignment portion provided on the processing tray and configured to align an edge of the medium; a transport section that contacts an upper surface of the medium placed on the processing tray and transports the medium to the edge alignment section; a position changing unit that changes a relative position of the transport unit with respect to the processing tray; a control unit that controls the position change unit to change the pressure with which the transport unit presses the medium; a post-processing section for performing post-processing on the medium on the processing tray; Equipped with The control unit changes the pressure based on processing information related to a processing performed on the medium, the processing information includes recording surface information relating to a recorded surface of the medium; The control unit is When recording has been performed on the upper surface of the medium that the transport unit contacts, the pressure is set to a first pressure; When no recording is being performed on the top surface of the medium that the transport unit contacts, the pressure is set to a second pressure; The post-treatment device, wherein the first pressure is smaller than the second pressure.

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