Aftertreatment Device

Abstract

To provide a post-processing device that can reduce the risk that a medium may be buckled.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 air blowing part 32 that blows air to the medium 17 placed on the processing tray 24; a control part 38 that controls the air blowing part 32; and a post-processing part 33 that performs post-processing to the medium 17 on the processing tray 24. The control part 38 changes air volumes of air blowing 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 paper, which is an example of a medium on which an image is formed. The post-processing device includes a stacker, which is an example of a processing tray on which paper is stacked, a stopper, which is an example of an edge alignment unit, and an air blowing unit that blows air toward the stacker. The air blowing unit forms a layer of air between the sheets of paper, making it easier for the sheets to move. The sheets are aligned as they fall and hit the stopper. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2012-140202 A Summary of the Invention [Problem to be solved by the invention]

[0004] The curl of the medium may change depending on the image formed on the medium, and the flexibility of the medium may change, so there is a risk that the medium may buckle depending on the state of the medium stacked on the processing tray. [Means for solving the problem]

[0005] A post-processing device that solves the above problems includes 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, a blower unit that blows air onto the medium loaded on the processing tray, a control unit that controls the blower unit, and a post-processing unit that performs post-processing on the medium on the processing tray, and the control unit changes the volume of the air blown based on processing information related to the processing performed on the medium.

[0006] A post-processing device that solves the above problem includes a first discharge unit that discharges a medium recorded by a recording unit that performs recording by ejecting liquid, a processing tray that loads the medium discharged by the first discharge unit, a post-processing unit that performs post-processing on the medium on the processing tray, a second discharge unit that discharges the medium loaded on the processing tray, an air blowing unit that blows air at the medium discharged by the second discharge unit, a control unit that controls the air blowing unit, and a loading tray that loads the medium discharged by the second discharge unit, and the control unit changes the volume of the air blown based on processing information related to the processing performed on the medium. [Brief description of the drawings]

[0007] [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 first discharge subroutine executed in the matching routine. [Diagram 5] 10 is a flowchart showing a second discharge subroutine executed in the matching routine. [Figure 6] 10 is a flowchart showing a first discharge subroutine in the second embodiment. [Figure 7] 13 is a flowchart showing a first discharge subroutine according to a third embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] (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.

[0009] 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.

[0010] 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.

[0011] 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.

[0012] 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.

[0013] 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.

[0014] 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.

[0015] 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.

[0016] [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.

[0017] 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.

[0018] 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 loaded on the stacking tray 26 is referred to as the third medium 17c. The second medium 17b is the medium 17 that is discharged to the processing tray 24 by the first discharge section 23 following the top first medium 17a among the multiple first media 17a loaded on the processing tray 24. 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.

[0019] 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.

[0020] 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. The first medium 17a placed on the processing tray 24 receives the first medium 17a that is discharged by the second discharge section 25 and falls. The first medium 17a is considered to be the third medium 17c by being stacked on the stacking tray 26.

[0021] Post-processing device 14 may include a detection unit 28 capable of detecting second medium 17b, a paddle 29 provided downstream of first discharge unit 23 in first discharge direction D1, 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 an air blower unit 32 that blows air to media 17 loaded on processing tray 24, and a post-processing unit 33 that performs post-processing on media 17 on processing tray 24.

[0022] 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.

[0023] 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.

[0024] The transport unit 31 is provided so as to be movable relatively to the processing tray 24. The transport unit 31 in this embodiment is movable between a transport position TP indicated by a two-dot chain line in Fig. 2 and a standby position WP indicated by a solid line in Fig. 2.

[0025] The transport position TP is a position where the transport unit 31 transports the second medium 17b. The transport unit 31 located at the transport position TP contacts the second medium 17b and sandwiches the first medium 17a and the second medium 17b between itself and the processing tray 24. When the first medium 17a is not placed on the processing tray 24, the transport unit 31 sandwiches the second medium 17b between itself and the processing tray 24.

[0026] 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.

[0027] 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.

[0028] The standby position WP is a position farther from the processing tray 24 than the transport position TP. The standby position WP is a position above the transport position TP. The transport unit 31 located at the standby position WP moves away from the first medium 17a and releases the constraint on the first medium 17a.

[0029] 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.

[0030] 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.

[0031] The control unit 38 changes the volume of air blown by controlling the air blowing unit 32. Specifically, the control unit 38 changes the volume of air blown based on processing information related to the processing performed on the medium 17.

[0032] [Processing information] The processing information may include 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 density of the upper and lower surfaces of each medium 17 individually, or may include a value calculated from the recording density.

[0033] The processing information may include at least one of a first upper-surface recording density of the upper surface of the first medium 17a, a first lower-surface recording density of the lower surface of the first medium 17a, a second upper-surface recording density of the upper surface of the second medium 17b, a second lower-surface recording density of the lower surface of the second medium 17b, a third upper-surface recording density of the upper surface of the third medium 17c, and a third lower-surface recording density of the lower surface of the third medium 17c. The processing information may include a value calculated from these recording densities.

[0034] For example, the processing information may include a first total value that is the sum of the first upper-surface recording density and the second lower-surface recording density. When multiple first media 17a are stacked on the processing tray 24, the first total value is the sum of the first upper-surface recording density of the top first medium 17a and the second lower-surface recording density of the second medium 17b that is discharged next to the first medium 17a.

[0035] The processing information may include a third total value that is the sum of the third upper-surface recording density and the first lower-surface recording density. When multiple third media 17c are stacked on stacking tray 26 and first discharge section 23 discharges multiple first media 17a collectively, the third total value is the sum of the third upper-surface recording density of the top third medium 17c and the first lower-surface recording density of the bottom first medium 17a.

[0036] In this embodiment, the first ejection section 23 ejects the second medium 17b, which has been recorded on only one side, with the recorded side facing down. The second ejection section 25 ejects the first medium 17a with the recorded side facing down. Therefore, the first medium 17a, the second medium 17b, and the third medium 17c, which have been recorded on one side, have a recorded side on the bottom side and an unrecorded side on the top side. The medium 17 which has been recorded on one side has a first top-side recording density, a second top-side recording density, and a third top-side recording density of 0%.

[0037] The processing information may include the number of first media 17a to be discharged collectively by second discharge unit 25. Post-processing unit 33 of the present embodiment performs post-processing on the number of first media 17a stacked on processing tray 24, and discharges the number of first media 17a that have been post-processed collectively to second discharge unit 25. Therefore, the number of first media 17a is an example of information related to post-processing performed on first media 17a.

[0038] The processing information may include a first 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 first transport time is the time required for a transport process to transport the recorded second medium 17b to the first discharge unit 23.

[0039] The processing information may include a second transport time from when the recording unit 21 records on the first medium 17a to when the second discharge unit 25 discharges the first medium 17a. In this embodiment, the second transport time is the time from when recording on the lowest first medium 17a among the multiple first media 17a stacked on the processing tray 24 is completed to when the second discharge unit 25 collectively discharges the multiple first media 17a including this first medium 17a. In other words, the second transport time is the time required for a series of processes to transport the recorded second medium 17b to the first discharge unit 23, discharge it from the first discharge unit 23, align and post-process it, and then discharge it from the second discharge unit 25.

[0040] The processing information may include 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.

[0041] 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.

[0042] [Matching routine] The alignment routine will be described with reference to the flowchart shown in Fig. 3. This alignment routine is executed when a command for recording with post-processing is input. The second conveyance threshold value used for comparison in the alignment routine is set in advance based on, for example, experimental results.

[0043] In step S101, the control unit 38 acquires processing information. That is, the control unit 38 acquires the second upper surface recording density, the second lower surface recording density, the first total value, the third total value, the number of sheets loaded, the humidity, the temperature, the first transport time, and the second transport time included in the processing information.

[0044] In step S102, the control unit 38 executes the first discharge subroutine shown in Fig. 4. In step S103, the control unit 38 aligns the second medium 17b by rotating the conveying unit 31. 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.

[0045] In step S104, 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 to be post-processed. If the number of stacked sheets has reached the processing number, step S104 becomes YES, and the control unit 38 transitions to step S105. In step S105, the control unit 38 causes the post-processing unit 33 to perform post-processing on the multiple first media 17a on the processing tray 24. In step S106, the control unit 38 executes the second discharge subroutine shown in FIG. 5.

[0046] In step S107, 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 S107 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 S107 becomes YES, and the control unit 38 ends the alignment routine.

[0047] In step S104, if the number of stacked sheets is insufficient for the number of sheets to be processed, step S104 becomes NO, and control unit 38 shifts the process to step S108. In step S108, control unit 38 compares the first transport time with the second transport threshold. If the first transport time is equal to or greater than the second transport threshold, step S108 becomes YES, and control unit 38 shifts the process to step S109. In step S109, control unit 38 causes blower 32 to blow air.

[0048] In step S108, if the first transport time is shorter than the second transport threshold, step S108 becomes NO, and the control unit 38 moves the process to step S101. In step S101, the control unit 38 acquires processing information. That is, the control unit 38 reacquires the second upper-surface recording density and the second lower-surface recording density of the previous second medium 17b as the first upper-surface recording density and the second lower-surface recording density of the next first medium 17a.

[0049] [First discharge subroutine] The first discharge subroutine will be described with reference to the flowchart shown in Fig. 4. The first total threshold, the first transport threshold, the temperature threshold, and the humidity threshold used for comparison in the first discharge subroutine are set in advance based on, for example, experimental results.

[0050] In step S201, the control unit 38 compares a first total value, which is the total of the first upper surface recording density and the second lower surface recording density, with a first total threshold value. If the first total value is lower than the first total threshold value, step S201 becomes YES, and the control unit 38 proceeds to step S202. In step S202, the control unit 38 controls the blower unit 32 to blow air at a first air volume.

[0051] In step S201, if the first total value is equal to or greater than the first total threshold, step S201 becomes NO, and the control unit 38 transitions the process to step S203. In step S203, the control unit 38 compares the first transport time with the first transport threshold. The first transport threshold is shorter than the second transport threshold. If the first transport time is equal to or less than the first transport threshold, step S203 becomes YES, and the control unit 38 transitions the process to step S204. In step S204, the control unit 38 controls the blower 32 to blow air at a second amount of air that is greater than the first amount.

[0052] In step S203, if the first transport time is longer than the first transport threshold, step S203 becomes NO, and the control unit 38 transitions the process to step S205. In step S205, the control unit 38 compares the air temperature with the air temperature threshold. If the air temperature is equal to or higher than the air temperature threshold, step S205 becomes YES, and the control unit 38 transitions the process to step S206. If the air temperature is lower than the air temperature threshold, step S205 becomes NO, and the control unit 38 transitions the process to step S207.

[0053] The control unit 38 performs the same process in steps S206 and S207. Specifically, in steps S206 and S207, the control unit 38 compares the humidity with a humidity threshold value.

[0054] If the temperature is equal to or higher than the temperature threshold value and the humidity is equal to or higher than the humidity threshold value, the determinations in steps S205 and S206 are YES, and the control unit 38 transitions the process to step S204.

[0055] If the temperature is equal to or higher than the temperature threshold and the humidity is lower than the humidity threshold, step S205 becomes YES and step S206 becomes NO. The control unit 38 proceeds to step S208. In step S208, the control unit 38 controls the blower 32 to blow air at a third amount of air. The third amount is greater than the first amount and less than the second amount.

[0056] If the temperature is lower than the temperature threshold and the humidity is equal to or higher than the humidity threshold, step S205 becomes NO and step S207 becomes YES. The control unit 38 shifts the process to step S208.

[0057] If the temperature is lower than the temperature threshold and the humidity is lower than the humidity threshold, the results in steps S205 and S207 are NO, and the control unit 38 transitions the process to step S202. In step S202, step S204, or step S208, the control unit 38 controls the blower 32 to blow air at the set air volume, and then ends the first discharge subroutine.

[0058] [Second discharge subroutine] The second discharge subroutine will be described with reference to the flowchart shown in Fig. 5. The third total threshold, number threshold, third transport threshold, temperature threshold, and humidity threshold used for comparison in the second discharge subroutine are set in advance based on, for example, experimental results. The temperature threshold and humidity threshold may be set separately for the first discharge subroutine and the second discharge subroutine, or the same threshold may be used.

[0059] In step S301, the control unit 38 compares a third total value, which is the total of the third upper-surface recording density and the first lower-surface recording density, with a third total threshold value. If the third total value is lower than the third total threshold value, step S301 becomes YES, and the control unit 38 proceeds to step S302.

[0060] In step S302, the control unit 38 compares the number of first media 17a stacked on the processing tray 24 with the number threshold. If the number of stacked sheets is less than the number threshold, step S302 becomes YES, and the control unit 38 proceeds to step S303. In step S303, the control unit 38 controls the blower 32 to blow air at a first amount of air. If the number of stacked sheets is equal to or greater than the number threshold, step S302 becomes NO, and the control unit 38 proceeds to step S305.

[0061] In step S301, if the third total value is equal to or greater than the third total threshold, step S301 becomes NO, and the control unit 38 transitions the process to step S304. In step S304, the control unit 38 compares the second transport time with the third transport threshold. The third transport threshold is longer than the first transport threshold and the second transport threshold. If the second transport time is equal to or less than the third transport threshold, step S304 becomes YES, and the control unit 38 transitions the process to step S305. In step S305, the control unit 38 controls the blower 32 to blow air at a second amount of air that is greater than the first amount.

[0062] In step S304, if the second transport time is longer than the third transport threshold, step S304 becomes NO, and the control unit 38 transitions the process to step S306. Steps S306 to S309 are the same as steps S205 to S208 shown in FIG. 4, and therefore the description thereof will be omitted.

[0063] [Operation of the first embodiment] As shown in Fig. 2, while the first discharge unit 23 is discharging 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 causes the blower 32 to blow air at a volume that matches the state of the first medium 17a and the second medium 17b.

[0064] Specifically, when a first sum of the first upper-surface recording density on the upper surface of the first medium 17a and the second lower-surface recording density on the lower surface of the second medium 17b is lower than a first sum threshold, the control unit 38 sets the air volume to a first amount. When the first sum is equal to or greater than the first sum threshold, the control unit 38 sets the air volume to a second amount that is greater than the first amount.

[0065] The control unit 38 may change the amount of air blowing depending on the first transport time from when the recording unit 21 records on the second medium 17b to when the first discharge unit 23 discharges the recorded second medium 17b. If the first transport time is long, the first medium 17a and the second medium 17b may be dried until the second medium 17b is discharged, and the frictional force between the first medium 17a and the second medium 17b may decrease. Therefore, when the first transport time is equal to or less than the first transport threshold, the control unit 38 may blow air at the second amount, and when the first transport time is longer than the first transport threshold, the control unit 38 may blow air at the first amount or the third amount. The third amount is greater than the first amount and less than the second amount. In other words, when the first transport time is equal to or less than the first transport threshold, the control unit 38 may increase the amount of air blowing compared to when the first transport time is longer than the first transport threshold.

[0066] 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, and therefore is less likely to dry.

[0067] The control unit 38 may increase the air volume 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 increase the air volume 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 air volume that the blower 32 blows when discharging the second medium 17b from the first discharge unit 23, based on the air temperature and humidity of the environment in which the post-processing device 14 is installed.

[0068] 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 causes the blower 32 to blow air at a second amount which is the maximum air volume. When the temperature is equal to or higher than the temperature threshold and the humidity is lower than the humidity threshold, or 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 causes the blower 32 to blow air at a third amount which is less than the second amount. When the temperature is lower than the temperature threshold and the humidity is lower than the humidity threshold, the control unit 38 causes the blower 32 to blow air at a first amount which is less than the third amount.

[0069] When the first discharge unit 23 discharges the second medium 17b, 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. Therefore, even if the aligned first medium 17a is exposed to wind, it is possible to promote drying of the first medium 17a while suppressing disturbance of the first medium 17a.

[0070] 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.

[0071] For example, when the detection unit 28 changes from a state in which it detects the second medium 17b to a state in which it does not detect the second medium 17b, the control unit 38 may determine that the second medium 17b has passed the first discharge unit 23. When the rear end of the second medium 17b in the first discharge direction D1 passes the first discharge unit 23, the control unit 38 controls the blower 32 to stop blowing air.

[0072] The control unit 38 moves the transport unit 31 to the standby position WP and rotates the paddle 29 in the counterclockwise direction in Fig. 2. The rotating paddle 29 sends the second medium 17b between the transport unit 31 located at the standby position WP and the processing tray 24.

[0073] Next, the control unit 38 moves the transport unit 31 to the transport position TP. The transport unit 31 located at the transport position TP contacts the upper surface of the second medium 17b placed on the processing tray 24. 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.

[0074] 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.

[0075] When the first transport time of the next second medium 17b is estimated to be equal to or longer than the second transport threshold, the control unit 38 may cause the blower 32 to blow air before the second medium 17b is transported to the first discharge unit 23. The air volume at this time may be, for example, the second volume. When the detector 28 detects the leading end of the second medium 17b, the control unit 38 may adjust the air volume to match the state of the first medium 17a and the second medium 17b. Therefore, the control unit 38 may cause the blower 32 to blow air until the first transport time has elapsed and the second medium 17b is discharged from the first discharge unit 23.

[0076] When the number of loaded 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 loaded 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. At this time, the blower unit 32 blows air onto the media 17 discharged by the second discharge unit 25. The control unit 38 causes the blower unit 32 to blow air at a volume that matches the state of the first media 17a and the third medium 17c.

[0077] Specifically, when a third sum of the third upper-surface recording density on the upper surface of the third medium 17c and the first lower-surface recording density on the lower surface of the first medium 17a is lower than a third sum threshold, the control unit 38 sets the airflow to the first amount. The first amount when the first medium 17a is discharged from the second discharge unit 25 may be the same as or different from the first amount when the second medium 17b is discharged from the first discharge unit 23.

[0078] When the third total value is equal to or greater than the third total threshold value, the control unit 38 sets the air volume to a second volume that is greater than the first volume. The second volume at which the first medium 17a is discharged from the second discharge unit 25 may be the same as or different from the second volume at which the second medium 17b is discharged from the first discharge unit 23.

[0079] The control unit 38 may change the amount of air blown depending on the number of first media 17a stacked on the processing tray 24. The second discharge unit 25 of this embodiment discharges multiple first media 17a that have been post-processed together. Therefore, the number of first media 17a discharged by the second discharge unit 25 is equal to the number of first media 17a to be post-processed by the post-processing unit 33. The control unit 38 may increase the amount of air blown when the number of stacked sheets is equal to or greater than the number threshold, compared to when the number of stacked sheets is less than the number threshold. For example, when the number of stacked sheets is less than the number threshold, the control unit 38 causes the blower unit 32 to blow air at a first amount. When the number of stacked sheets is equal to or greater than the number threshold, the control unit 38 causes the blower unit 32 to blow air at a second amount greater than the first amount. The blower unit 32 blows air against the upper surface of the topmost first medium 17a among the multiple first media 17a, thereby suppressing the bulging of the multiple first media 17a.

[0080] The control unit 38 may change the amount of airflow depending on a second transport time from when the recording unit 21 records on the lowest first medium 17a among the multiple first media 17a until when the second discharge unit 25 discharges this first medium 17a. When the second transport time is equal to or less than the third transport threshold, the control unit 38 may increase the amount of airflow compared to when the third transport time is longer than the third transport threshold.

[0081] If the second transport time is long, the third medium 17c may be dried before the first medium 17a is discharged, and the frictional force between the first medium 17a and the third medium 17c may decrease. Therefore, the control unit 38 may blow air at the second amount when the second transport time is equal to or less than the third transport threshold, and may blow air at the first amount or the third amount when the second transport time is longer than the third transport threshold. The third amount is greater than the first amount and less than the second amount. The third amount when the first medium 17a is discharged from the second discharge unit 25 may be the same as or different from the third amount when the second medium 17b is discharged from the first discharge unit 23.

[0082] The control unit 38 may change the amount of air blown in accordance with the temperature and humidity when discharging the first medium 17a from the second discharge unit 25, similarly to when discharging the second medium 17b from the first discharge unit 23. The control unit 38 may increase the amount of air blown 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 increase the amount of air blown when the temperature is equal to or higher than the temperature threshold value, compared to when the temperature is lower than the temperature threshold value.

[0083] [Effects of the first embodiment] (1) Control unit 38 changes the volume of air blown by blower 32 to medium 17 based on processing information related to processing performed on medium 17. As a result, blower 32 can blow air to medium 17 at a volume that matches the state of medium 17, reducing the risk of medium 17 buckling.

[0084] (2) The frictional force between the first medium 17a and the second medium 17b varies depending on the recording density of the surfaces in contact with each other. Specifically, the frictional force between the first medium 17a and the second medium 17b is larger when the first total value of the first upper surface recording density of the first medium 17a and the second lower surface recording density of the second medium 17b is high than when the first total value is low. When the frictional force is large, the second medium 17b is less likely to slip relative to the first medium 17a than when the frictional force is small, and the second medium 17b is more likely to buckle. In this regard, when the first total value of the first upper surface recording density and the second lower surface recording density is equal to or greater than the first total threshold, the control unit 38 increases the air volume compared to when the first total value is lower than the first total threshold. Therefore, the second medium 17b is more likely to move relative to the first medium 17a, and the risk of the second medium 17b buckling can be reduced.

[0085] (3) Moisture-absorbed medium 17 is more likely to bend than dry medium 17. Medium 17 is more likely to absorb water vapor when the humidity is high than when the humidity is low. In this regard, the processing information includes humidity information. Control unit 38 can change the air volume based on the humidity, and can blow air at a volume that takes into account the effect of water vapor in the air.

[0086] (4) The image recorded on the medium 17 dries while being transported. Therefore, if the first transport time is short, the medium 17 may be discharged from the first discharge unit 23 with the image not sufficiently dried. The processing information includes the first transport time. The control unit 38 can change the air volume based on the first transport time, and can blow air at a volume that takes into account the dryness of the medium 17.

[0087] (5) The first medium 17a is loaded on the processing tray 24. Therefore, when the first discharge unit 23 discharges the subsequent second medium 17b, the first medium 17a is loaded on the processing tray 24. The control unit 38 causes the blower 32 to blow air when it is estimated that the first transport time is equal to or longer than the second transport threshold. That is, the blower 32 causes the blower 32 to blow air to the previous first medium 17a loaded on the processing tray 24 before the subsequent second medium 17b is discharged from the first discharge unit 23. Therefore, the blower 32 can promote drying of the first medium 17a loaded on the processing tray 24.

[0088] (6) The frictional force between the first medium 17a and the third medium 17c varies depending on the recording density of the surfaces in contact with each other. Specifically, the frictional force between the first medium 17a and the third medium 17c is larger when the third total value of the first lower surface recording density of the first medium 17a and the third upper surface recording density of the third medium 17c is high than when the third total value is low. When the frictional force is large, the first medium 17a is less likely to slip against the third medium 17c than when the frictional force is small, and the first medium 17a is more likely to buckle. In this regard, when the third total value of the first lower surface recording density and the third upper surface recording density is equal to or greater than the third total threshold, the control unit 38 increases the air volume compared to when the third total value is lower than the third total threshold. Therefore, the first medium 17a is more likely to move relative to the third medium 17c, and the risk of the first medium 17a buckling can be reduced.

[0089] (7) A large number of first media 17a stacked on processing tray 24 and discharged by second discharge unit 25 are more likely to buckle than a small number of first media 17a. The processing information includes the number of first media 17a. Control unit 38 can cause blower unit 32 to blow air at a volume that matches the state of first media 17a stacked on processing tray 24.

[0090] (8) When the second discharge section 25 discharges the first medium 17a, the third medium 17c discharged from the second discharge section 25 is loaded on the stacking tray 26. The third medium 17c loaded on the stacking tray 26 is dried while the next first medium 17a is being discharged. Therefore, if the second transport time until the next first medium 17a is discharged is short, the next first medium 17a may be discharged in a state in which the previous third medium 17c is not sufficiently dried. If the drying is insufficient, the subsequent first medium 17a does not slide easily against the previous third medium 17c, and the subsequent medium 17 is likely to buckle. In this regard, when the second transport time is equal to or less than the third transport threshold, the control section 38 increases the air volume compared to when the second transport time is longer than the third transport threshold. Therefore, the first medium 17a is more likely to move, and the risk of the first medium 17a buckling can be reduced.

[0091] Second embodiment Next, a second embodiment of the post-treatment device will be described with reference to the drawings. In the second embodiment, the first discharge subroutine is different from that in the first embodiment. In other respects, the second embodiment is almost the same as the first embodiment, so that the same components are denoted by the same reference numerals and a duplicated description will be omitted.

[0092] [Processing information] The processing information may include a density difference that is the difference between a second upper-surface recording density on the upper surface of the second medium 17b and a second lower-surface recording density on the lower surface of the second medium 17b.

[0093] [First Discharge Subroutine of the Second Embodiment] Next, the first discharge subroutine will be described with reference to the flowchart shown in Fig. 6. The concentration difference threshold value used for comparison in the first discharge routine is set in advance based on, for example, experimental results.

[0094] This first discharge routine is executed in step S102 of the matching routine shown in Fig. 3. In the second embodiment, the control unit 38 also acquires the concentration difference as the processing information in step S101 of the matching routine.

[0095] As shown in FIG. 6, in step S401, the control unit 38 compares a density difference, which is the difference between the second upper-surface recording density of the second medium 17b and the second lower-surface recording density of the lower surface of the second medium 17b, with a density difference threshold.

[0096] If the density difference is equal to or greater than the density difference threshold, step S401 becomes YES, and the control unit 38 proceeds to step S402. In step S402, the control unit 38 compares the second upper-surface recording density and the second lower-surface recording density of the second medium 17b. If the second upper-surface recording density is equal to or less than the second lower-surface recording density, step S402 becomes YES, and the control unit 38 proceeds to step S403. In step S403, the control unit 38 controls the blower 32 to blow air at the first amount of air.

[0097] If the second upper surface recording density is higher than the second lower surface recording density, step S402 becomes NO, and the control unit 38 moves the process to step S406. In step S406, the control unit 38 controls the blower 32 to blow air at a second amount that is greater than the first amount.

[0098] In step S401, if the density difference is less than the density difference threshold, step S401 becomes NO, and the control unit 38 transitions the process to step S404. In step S404, the control unit 38 compares a first total value, which is the total of the first upper-surface recording density of the upper surface of the first medium 17a and the second lower-surface recording density of the lower surface of the second medium 17b, with the first total threshold. If the first total value is less than the first total threshold, step S404 becomes NO, and the control unit 38 transitions the process to step S403.

[0099] If the first total value is equal to or greater than the first total threshold value, step S404 becomes YES, and the control unit 38 transitions the process to step S405. Steps S405 to S410 are the same as steps S203 to S208 shown in FIG. 4, and therefore the description thereof will be omitted.

[0100] [Operation of the second embodiment] The control unit 38 changes the amount of air sent by the blower 32 when the first ejection unit 23 ejects the second medium 17b in accordance with the recording density of the second medium 17b.

[0101] The control unit 38 sets the airflow to the first amount when the second lower-surface recording density on the lower surface of the second medium 17b is higher than the second upper-surface recording density on the upper surface of the second medium 17b by at least a density difference threshold. That is, the control unit 38 sets the airflow to the first amount when the density difference between the second upper-surface recording density on the upper surface of the second medium 17b and the second lower-surface recording density on the lower surface of the second medium 17b is at least a density difference threshold and the second upper-surface recording density is at most the second lower-surface recording density.

[0102] When the second upper-surface recording density is higher than the second lower-surface recording density by the density difference threshold or more, the control unit 38 sets the air volume to a second volume that is higher than the first volume. That is, when the density difference between the second upper-surface recording density and the second lower-surface recording density is equal to or greater than the density difference threshold and the second upper-surface recording density is higher than the second lower-surface recording density, the control unit 38 sets the air volume to the second volume.

[0103] When the density difference between the second upper-surface recording density and the second lower-surface recording density is lower than the density difference threshold, the control unit 38 adjusts the air volume according to a first total value, which is the total of the first upper-surface recording density on the upper surface of the first medium 17a and the second lower-surface recording density on the lower surface of the second medium 17b. When the first total value is lower than the first total threshold, the control unit 38 sets the air volume to the first volume. When the first total value is equal to or greater than the first total threshold, the control unit 38 sets the air volume to the second volume.

[0104] [Effects of the second embodiment] (9) When the second lower-surface recording density is higher than the second upper-surface recording density by the density difference threshold or more, the second medium 17b is likely to curl upward. When the second upper-surface recording density is higher than the second lower-surface recording density by the density difference threshold or more, the second medium 17b is likely to curl drooping. When the second upper-surface recording density is higher than the second lower-surface recording density by the density threshold or more, the control unit 38 increases the air volume. Therefore, the second medium 17b curling drooping can be supported by the wind, and the risk of the second medium 17b hitting the first medium 17a and buckling can be reduced.

[0105] (10) When the density difference between the second upper surface recording density and the second lower surface recording density is lower than the density difference threshold, the second medium 17b is less likely to curl than when the density difference is equal to or higher than the density difference threshold. However, when the first total value of the first upper surface recording density and the second lower surface recording density is high, the frictional force between the first medium 17a and the second medium 17b is greater than when the first total value is low. In this regard, even when the density difference between the second upper surface recording density and the second lower surface recording density is lower than the density difference threshold, the control unit 38 increases the air volume when the first total value of the first upper surface recording density and the second lower surface recording density is equal to or higher than the first total threshold. Therefore, the second medium 17b is more likely to move relative to the first medium 17a, and the risk of the second medium 17b buckling can be reduced.

[0106] Third embodiment Next, a third embodiment of the post-processing device will be described with reference to the drawings. In the third embodiment, a part of the first discharge subroutine is different from that of the first and second embodiments. In other respects, the third embodiment is almost the same as the first embodiment, so that the same components are denoted by the same reference numerals and a duplicated description will be omitted.

[0107] [Processing information] The processing information may include a second sum that is the sum of a second upper surface recording density on the upper surface of the second medium 17b and a second lower surface recording density on the lower surface of the second medium 17b.

[0108] [First Discharge Subroutine of the Third Embodiment] Next, the first discharge subroutine will be described with reference to the flowchart shown in Fig. 7. The second total threshold value used for comparison in the first discharge routine is set in advance based on, for example, experimental results.

[0109] This first discharge routine is executed in step S102 of the matching routine shown in Fig. 3. In the third embodiment, the control unit 38 also acquires a second total value as processing information in step S101 of the matching routine.

[0110] As shown in FIG. 7, steps S501 to S503 are the same as steps S401 to S403 shown in FIG. 6, and therefore the description thereof will be omitted. In step S504, the control unit 38 compares a second total value, which is the total of the second upper-surface recording density of the upper surface of the second medium 17b and the second lower-surface recording density of the lower surface of the second medium 17b, with a second total threshold value. If the second total value is less than the second total threshold value, step S504 becomes NO, and the control unit 38 proceeds to step S503.

[0111] If the second total value is equal to or greater than the second total threshold value, step S504 becomes YES, and the control unit 38 transitions the process to step S505. Steps S505 to S510 are the same as steps S203 to S208 shown in FIG. 4, and therefore the description thereof will be omitted.

[0112] [Operation of the third embodiment] The control unit 38 changes the amount of air sent by the blower 32 when the first ejection unit 23 ejects the second medium 17b in accordance with the recording density of the second medium 17b.

[0113] When the density difference between the second upper-surface recording density and the second lower-surface recording density is lower than the density difference threshold, the control unit 38 adjusts the air volume according to a second total value, which is the total of the second upper-surface recording density on the upper surface of the second medium 17b and the second lower-surface recording density on the lower surface of the second medium 17b. When the second total value is lower than the second total threshold, the control unit 38 sets the air volume to the first volume. When the second total value is equal to or greater than the second total threshold, the control unit 38 sets the air volume to the second volume.

[0114] [Effects of the third embodiment] (11) When the second total value of the second upper-surface recording density and the second lower-surface recording density is high, the second medium 17b is more likely to sag than when the second total value is low. In this regard, the control unit 38 sets the second amount when the second total value is equal to or greater than the second total threshold value, even if the density difference between the second upper-surface recording density and the second lower-surface recording density is equal to or less than the density difference threshold value. Therefore, the sagging second medium 17b can be supported by the wind, and the risk of the second medium 17b hitting the first medium 17a and buckling can be reduced.

[0115] 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. Control unit 38 may increase the airflow when medium 17 is thin compared to when medium 17 is thick.

[0116] The processing information may include the grain direction of the medium 17. The grain direction is the orientation of the fibers that make up the medium 17. When the grain direction and the first discharge direction D1 do not align, the control unit 38 may increase the airflow compared to when the grain direction and the first discharge direction D1 align.

[0117] The processing information may include size information regarding the size of the medium 17. The size information may be at least one of the length and width of the medium 17, or may be a standard size such as A4 or A3. The control unit 38 may change the air volume depending on the size. For example, the control unit 38 may increase the air volume when the size of the medium 17 is large compared to when the size is small.

[0118] 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 air volume may be increased compared to when the resolution is high and the transport time is long.

[0119] 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 increase the airflow rate 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.

[0120] The control unit 38 may change the air volume based on at least one of the first top surface recording density, the first bottom surface recording density, the second top surface recording density, the second bottom surface recording density, the third top surface recording density, the third bottom surface recording density, the number of sheets loaded, the humidity, the temperature, the first transport time, and the second transport time.

[0121] When adjusting the change amount based on humidity, the control unit 38 does not need to take the temperature into consideration. The control unit 38 may store a plurality of humidity threshold values. The control unit 38 may store a plurality of air temperature threshold values.

[0122] After aligning the second medium 17b, the control unit 38 may cause the blower 32 to start blowing air regardless of the first transport time of the next second medium 17b. After moving the transport unit 31, which is located at the standby position WP, to the transport position TP, the control unit 38 may cause the blower 32 to start blowing air regardless of the first transport time of the next second medium 17b. In other words, the control unit 38 may blow air to the second medium 17b to be aligned. The control unit 38 may adjust the air volume at the timing when the next second medium 17b is transported to the first discharge unit 23, or may stop blowing air once before the next second medium 17b is transported to the first discharge unit 23.

[0123] 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.

[0124] 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 section that discharges a medium recorded by a recording section that performs recording by ejecting liquid, a processing tray that loads the medium discharged by the discharge section, a blower section that blows air onto the medium loaded on the processing tray, a control section that controls the blower section, and a post-processing section that performs post-processing on the medium on the processing tray, and the control section changes the volume of the air blown based on processing information related to the processing performed on the medium.

[0125] According to this configuration, the control unit changes the volume of air blown by the blower to the medium based on the processing information related to the processing to be performed on the medium, so that the blower can blow air to the medium at a volume that matches the state of the medium, thereby reducing the risk of the medium buckling.

[0126] (B) In a post-processing device, the processing information includes a first sum of a first upper surface recording density of the upper surface of a first medium placed on the processing tray and a second lower surface recording density of the lower surface of a second medium discharged to the processing tray by the discharge unit following the first medium, and the control unit may set the air volume to a first amount when the first sum is lower than a first sum threshold, and set the air volume to a second amount greater than the first amount when the first sum is equal to or greater than the first sum threshold.

[0127] The frictional force between the first medium and the second medium varies depending on the recording density of the surfaces in contact with each other. Specifically, the frictional force between the first medium and the second medium is larger when the first total value of the first upper surface recording density of the first medium and the second lower surface recording density of the second medium is high than when the first total value is low. When the frictional force is large, the second medium is less likely to slip relative to the first medium and the second medium is more likely to buckle than when the frictional force is small. In this respect, according to this configuration, when the first total value of the first upper surface recording density and the second lower surface recording density is equal to or greater than the first total threshold, the control unit increases the air volume compared to when the first total value is lower than the first total threshold. Therefore, the second medium is more likely to move relative to the first medium, and the risk of the second medium buckling can be reduced.

[0128] (C) In a post-processing device, the processing information includes a second upper surface recording density of the upper surface of the second medium discharged by the discharge unit and a second lower surface recording density of the lower surface of the second medium, and the control unit may set the air volume to a first amount when the second lower surface recording density is higher than the second upper surface recording density by more than a density difference threshold, and set the air volume to a second amount greater than the first amount when the second upper surface recording density is higher than the second lower surface recording density by more than the density difference threshold.

[0129] When the second lower-surface recording density is higher than the second upper-surface recording density by at least the density difference threshold, the second medium is likely to curl in a lifting manner. When the second upper-surface recording density is higher than the second lower-surface recording density by at least the density difference threshold, the second medium is likely to curl in a drooping manner. With this configuration, the control unit increases the air volume when the second upper-surface recording density is higher than the second lower-surface recording density by at least the density threshold. Therefore, the second medium that curls in a drooping manner can be supported by the air, reducing the risk of the second medium hitting the first medium and buckling.

[0130] (D) In ​​a post-processing device, the processing information includes a first sum of a first upper-surface recording density of an upper surface of a first medium placed on the processing tray and the second lower-surface recording density, and the control unit may set the air volume to the second amount when a difference between the second upper-surface recording density and the second lower-surface recording density is lower than the density difference threshold and the first sum is equal to or greater than the first sum threshold.

[0131] When the difference between the second upper-surface recording density and the second lower-surface recording density is lower than the density difference threshold, the second medium is less likely to curl than when the difference is equal to or higher than the density difference threshold. However, when the first total value of the first upper-surface recording density and the second lower-surface recording density is high, the frictional force between the first medium and the second medium is higher than when the first total value is low. In this respect, with this configuration, the control unit increases the air volume when the first total value of the first upper-surface recording density and the second lower-surface recording density is equal to or higher than the first total threshold, even when the difference between the second upper-surface recording density and the second lower-surface recording density is lower than the density difference threshold. Therefore, the second medium is more likely to move relative to the first medium, and the risk of the second medium buckling can be reduced.

[0132] (E) In a post-processing device, the processing information includes a second sum of the second upper surface recording density and the second lower surface recording density, and the control unit may set the air volume to the first amount when the difference between the second upper surface recording density and the second lower surface recording density is lower than the density difference threshold and the second sum is lower than the second sum threshold, and may set the air volume to the second amount when the difference between the second upper surface recording density and the second lower surface recording density is lower than the density difference threshold and the second sum is equal to or greater than the second sum threshold.

[0133] The second medium is more likely to sag when the second total value of the second upper-surface recording density and the second lower-surface recording density is high than when the second total value is low. In this respect, with this configuration, the control unit sets the second amount when the second total value is equal to or greater than the second total threshold, even if the difference between the second upper-surface recording density and the second lower-surface recording density is equal to or less than the density difference threshold. Therefore, the sagging second medium can be supported by the wind, reducing the risk of the second medium hitting the first medium and buckling.

[0134] (F) In the post-processing device, the processing information may include humidity information regarding humidity, and the control unit may increase the air volume 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.

[0135] A hygroscopic medium is more likely to bend than a dry medium. When the humidity is high, the medium is more likely to absorb water vapor than when the humidity is low. In this regard, according to this configuration, the processing information includes humidity information. The control unit can change the air volume based on the humidity, and can blow air at a volume that takes into account the effect of water vapor in the air.

[0136] (G) In a post-processing device, the processing information includes a first transport time from when the recording unit records on the medium to when the discharge unit discharges the medium, and the control unit may increase the air volume when the first transport time is equal to or less than a first transport threshold value compared to when the first transport time is longer than the first transport threshold value.

[0137] The image recorded on the medium dries while being transported. Therefore, if the first transport time is short, the medium may be discharged from the discharge section with the image not sufficiently dried. According to this configuration, the processing information includes the first transport time. The control section can change the air volume based on the first transport time, and can blow air at a volume that takes into account the dryness state of the medium.

[0138] (H) In a post-processing device, the processing information includes a first transport time from when the recording unit records on the medium to when the discharge unit discharges the medium, and when the control unit estimates that the first transport time is equal to or longer than a second transport threshold, the control unit may cause the blower unit to blow air until the first transport time has elapsed and the medium has been discharged from the discharge unit.

[0139] Media are loaded on the processing tray. Therefore, when the discharge unit discharges a subsequent medium, the previous medium is loaded on the processing tray. According to this configuration, the control unit causes the blower unit to blow air when it is estimated that the first transport time is equal to or greater than the second transport threshold. That is, the blower unit causes the blower unit to blow air on the previous medium loaded on the processing tray before the subsequent medium is discharged from the discharge unit. Therefore, the blower unit can promote drying of the media loaded on the processing tray.

[0140] (I) A post-processing device includes a first discharge unit that discharges a medium recorded by a recording unit that performs recording by discharging a liquid, a processing tray that loads the medium discharged by the first discharge unit, a post-processing unit that performs post-processing on the medium on the processing tray, a second discharge unit that discharges the medium loaded on the processing tray, an air blowing unit that blows air onto the medium discharged by the second discharge unit, a control unit that controls the air blowing unit, and a loading tray that loads the medium discharged by the second discharge unit, and the control unit changes the volume of the air blown based on processing information related to the processing performed on the medium. This configuration can achieve the same effects as the above-mentioned post-processing device.

[0141] (J) In a post-processing device, the processing information includes a third sum of a third upper surface recording density of the upper surface of a third medium loaded on the loading tray and a first lower surface recording density of the lower surface of a first medium discharged by the second discharge section, and the control section may set the air volume to a first amount when the third sum is lower than a third sum threshold, and set the air volume to a second amount greater than the first amount when the third sum is equal to or greater than the third sum threshold.

[0142] The frictional force between the first medium and the third medium varies depending on the recording density of the surfaces in contact with each other. Specifically, the frictional force between the first medium and the third medium is larger when the third total value of the first lower surface recording density of the first medium and the third upper surface recording density of the third medium is high than when the third total value is low. When the frictional force is large, the first medium is less likely to slip relative to the third medium than when the frictional force is small, and the first medium is more likely to buckle. In this respect, according to this configuration, when the third total value of the first lower surface recording density and the third upper surface recording density is equal to or greater than the third total threshold, the control unit increases the air volume compared to when the third total value is lower than the third total threshold. Therefore, the first medium is more likely to move relative to the third medium, and the risk of the first medium buckling can be reduced.

[0143] (K) In a post-processing device, the processing information may include the number of sheets of the first medium to be discharged by the second discharge section, and the control section may increase the air volume when the number is equal to or greater than a number threshold value compared to when the number is less than the number threshold value.

[0144] A large number of first media loaded on the processing tray and discharged by the second discharge unit are more likely to buckle than a small number of first media. With this configuration, the processing information includes the number of first media. The control unit can cause the blower to blow air at a volume that matches the state of the first media loaded on the processing tray.

[0145] (L) In the post-processing device, the processing information may include humidity information related to humidity, and the control unit may increase the airflow 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. With this configuration, it is possible to achieve the same effects as the post-processing device described above.

[0146] (M) In a post-processing device, the processing information includes a second transport time from when the recording unit records on the medium to when the second discharge unit discharges the medium, and the control unit may increase the air volume when the second transport time is equal to or less than a third transport threshold value compared to when the second transport time is longer than the third transport threshold value.

[0147] When the second discharge unit discharges a medium, the stacking tray is loaded with media that was previously discharged from the second discharge unit. The media loaded on the stacking tray are dried while the next medium is being discharged. Therefore, if the second transport time until the next medium is discharged is short, the next medium may be discharged while the previous medium is not sufficiently dried. If the drying is insufficient, the subsequent medium does not slide easily relative to the previous medium, and the subsequent medium is likely to buckle. In this regard, according to this configuration, when the second transport time is equal to or less than the third transport threshold, the control unit increases the air volume compared to when the second transport time is longer than the third transport threshold. Therefore, the medium is easier to move, and the risk of the medium buckling can be reduced. [Explanation of symbols]

[0148] 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...blowing 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; a blower that blows air onto the media before they are loaded onto the processing tray; A control unit that controls the air blower; a post-processing section for performing post-processing on the medium on the processing tray; Equipped with The control unit changes the volume of the air blown based on a first upper surface recording density of the upper surface of a first medium placed on the processing tray and a second lower surface recording density of the lower surface of a second medium discharged to the processing tray by the discharge unit following the first medium.

2. The control unit: When a first sum of the first upper surface recording density and the second lower surface recording density is lower than a first sum threshold, the air volume is set to a first volume; The post-processing device according to claim 1 , wherein, when the first total value is equal to or greater than the first total threshold value, the air volume is set to a second volume that is greater than the first volume.

3. 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; a blower that blows air onto the media before they are loaded onto the processing tray; A control unit that controls the air blower; a post-processing section for performing post-processing on the medium on the processing tray; Equipped with The control unit changes the volume of the air blown based on a second upper surface recording density of the upper surface of the second medium discharged by the discharge unit and a second lower surface recording density of the lower surface of the second medium.

4. The control unit: When the second lower surface recording density is higher than the second upper surface recording density by a density difference threshold or more, the air volume is set to a first volume; 4. The post-processing device according to claim 3, wherein the air volume is set to a second volume greater than the first volume when the second upper surface recording density is higher than the second lower surface recording density by the density difference threshold or more.

5. The post-processing device described in Claim 4, characterized in that the control unit sets the air volume to the second amount when the difference between the second upper surface recording density and the second lower surface recording density is lower than the density difference threshold and a first total value of the first upper surface recording density of the upper surface of the first medium placed on the processing tray and the second lower surface recording density is equal to or greater than a first total threshold.

6. The control unit: when a difference between the second upper surface recording density and the second lower surface recording density is lower than the density difference threshold and a second sum of the second upper surface recording density and the second lower surface recording density is lower than a second sum threshold, the air volume is set to the first volume; 5. The post-processing device according to claim 4, wherein when the difference between the second upper surface recording density and the second lower surface recording density is lower than the density difference threshold and the second total value is equal to or greater than the second total threshold, the air volume is set to the second volume.

7. A post-processing device as described in any one of claims 1 to 6, characterized in that the control unit increases the air volume 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.

8. A post-processing device as described in any one of claims 1 to 7, characterized in that the control unit increases the air volume when a first transport time from when the recording unit records on the medium to when the discharge unit discharges the medium is equal to or shorter than a first transport threshold value, compared to when the first transport time is longer than the first transport threshold value.

9. A post-processing device as described in any one of claims 1 to 8, characterized in that when the control unit estimates that a first transport time from when the recording unit records on the medium to when the discharge unit discharges the medium is longer than a second transport threshold, the control unit causes the blowing unit to blow air until the first transport time has elapsed and the medium is discharged from the discharge unit.

10. a first 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 first discharge unit; a post-processing section for performing post-processing on the medium on the processing tray; a second discharge unit that discharges the medium stacked on the processing tray; a blower that blows air to the medium before it is discharged by the second discharge unit; A control unit that controls the air blower; a stacking tray that stacks the medium discharged by the second discharge unit; Equipped with The control unit changes the volume of the air blown based on a third upper surface recording density of the upper surface of a third medium loaded on the loading tray and a first lower surface recording density of the lower surface of a first medium discharged by the second discharge unit.

11. The control unit: When a third sum of the third upper surface recording density and the first lower surface recording density is lower than a third sum threshold, the air volume is set to a first volume; The post-processing device according to claim 10 , wherein, when the third total value is equal to or greater than the third total threshold value, the air volume is set to a second volume that is greater than the first volume.

12. A post-processing device as described in claim 10 or claim 11, characterized in that the control unit increases the air volume when the number of sheets of the first medium discharged by the second discharge unit is equal to or greater than a number threshold value, compared to when the number is less than the number threshold value.

13. A post-processing device as described in any one of claims 10 to 12, characterized in that the control unit increases the air volume 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.

14. A post-processing device as described in any one of claims 10 to 13, characterized in that the control unit increases the air volume when a second transport time from when the recording unit records on the medium to when the second discharge unit discharges the medium is equal to or less than a third transport threshold value, compared to when the second transport time is longer than the third transport threshold value.

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