Aftertreatment Device

Abstract

To provide a post-processing device capable of reducing possibilities of damaging an image recorded in a medium.SOLUTION: A post-processing device comprises: a first discharge part 23 for discharging a medium 17 recorded by a recording part; a processing tray 24 on which the medium 17 is loaded; an end part alignment part 30 for aligning an end part of the medium 17; a transportation part 31 coming into contact with an upper surface of the medium 17 placed on the processing tray 24 to transport the medium 17 to the end part alignment part 30; a position change part 32 for changing a relative position of the transportation part 31 to the processing tray 24; a control part 38 for controlling the position change part 32; and a post-processing part 33 for performing post-processing on the medium 17 on the processing tray 24. The position change part 32 can move the transportation part 31 to a transportation position TP for transporting the medium 17 and a waiting position WP apart from the processing tray 24 than the transportation position TP. The control part 38 changes the waiting position WP based on processing information related to processing performed to the medium 17. The processing information includes information related to processing performed to a first medium 17a.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 sheet processing device that is an example of a post-processing device that performs post-processing on a sheet that is an example of a medium on which an image is formed. The sheet processing device includes a discharge roller that is an example of a discharge section, a processing tray on which the discharged sheets are stacked, a knurled belt that is an example of a conveying section that conveys the sheets on the processing tray, and a sheet end regulating member that is an example of an end alignment section.

[0003] The knurled belt receives the sheet at a standby position away from the sheet, and conveys the received sheet by rotating at an operating position, which is an example of a conveying position where the knurled belt contacts the sheet. The knurled belt conveys the sheet and aligns the sheet by abutting it against a sheet edge regulating member.

[0004] A sheet on which an image is formed may curl. If the curled sheet hits the knurled belt located at the standby position, the image formed on the sheet may be damaged. For this reason, the sheet processing apparatus changes the standby position of the knurled belt according to the amount of curl of the sheet discharged by the discharge roller. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2020-90375 A Summary of the Invention [Problem to be solved by the invention]

[0006] Media may be loaded onto the processing tray in a curled state. When a second medium discharged from the discharge section is placed on top of a first medium loaded onto the processing tray, the curl of the first medium may affect the second medium. In other words, if the first medium is curled, even if the second medium is not curled itself, it may deform to fit the first medium and hit the transport section, causing damage to the image. [Means for solving the problem]

[0007] A post-processing device that solves the above problem 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, 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 controls the position change unit, and a post-processing unit that performs post-processing on the medium on the processing tray, wherein the position change unit is capable of moving the transport unit to a transport position where the medium is transported and a waiting position that is farther from the processing tray than the transport position, and the control unit changes the waiting position based on processing information related to the processing to be performed on the medium, and the processing information includes information related to the processing to be performed on the first medium, between a first medium that has been aligned and a second medium that has not yet been aligned. [Brief description of the drawings]

[0008] [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 recording surface adjustment subroutine executed in the alignment routine. [Diagram 5] 11 is a flowchart showing a sheet number adjustment subroutine executed in the alignment routine. [Figure 6] 10 is a flowchart showing a humidity adjustment subroutine executed in the matching routine. [Figure 7] 11 is a flowchart showing an elapsed time adjustment subroutine executed in the consistency routine. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] (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.

[0010] 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.

[0011] 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.

[0012] 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.

[0013] 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.

[0014] 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.

[0015] 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.

[0016] 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.

[0017] [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.

[0018] 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.

[0019] 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.

[0020] 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.

[0021] 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.

[0022] 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.

[0023] 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.

[0024] 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.

[0025] 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. The position changer 32 can move the transport unit 31 to 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.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] The control unit 38 changes the standby position WP by controlling the position change unit 32. Specifically, the control unit 38 changes the standby position WP based on processing information related to the processing performed on the medium 17.

[0033] [Processing information] The processing information includes information on processing to be performed on at least the first medium 17a out of the aligned first medium 17a and the unaligned second medium 17b.

[0034] 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.

[0035] The processing information may include a first recording density of the first medium 17a and a second recording density of the second medium 17b. The first recording density and the second recording density may include recording densities of the upper and lower surfaces, respectively. That is, the first recording density may include an upper surface recording density of the upper surface of the first medium 17a and a lower surface recording density of the lower surface of the first medium 17a. The second recording density may include an upper surface recording density of the upper surface of the second medium 17b and a lower surface recording density of the lower surface of the second medium 17b.

[0036] In this embodiment, the first ejection unit 23 ejects the second medium 17b, which is recorded only on one side, with the recorded side facing down. Therefore, the lower side of the first medium 17a and the second medium 17b, which are recorded on one side, is the recorded side, and the upper side is the unrecorded side. The upper surface recording density of the upper surface of the first medium 17a and the second medium 17b, which are recorded on one side, is 0%.

[0037] The processing information may include the number of first media 17a loaded on the processing tray 24. The post-processing unit 33 of this embodiment performs post-processing on the processing number of first media 17a loaded on the processing tray 24. Therefore, the number of first media 17a is an example of information related to the post-processing performed on the first media 17a.

[0038] The processing information may include the elapsed time since the recording unit 21 recorded on the first medium 17a. In other words, the elapsed time is the time required for the recorded medium 17 to go through a series of processes of being transported to the post-processing device 14, discharged from the first discharge unit 23 as the second medium 17b, and aligned to become the first medium 17a. The elapsed time in this embodiment is the time that has elapsed since recording was made on the uppermost first medium 17a among the multiple first media 17a stacked on the processing tray 24.

[0039] 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.

[0040] 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.

[0041] [Matching routine] 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. The second concentration threshold used for comparison in the matching routine is set in advance based on, for example, experimental results.

[0042] In step S101, the control unit 38 acquires processing information. That is, the control unit 38 acquires the first recording density, the second recording density, the number of sheets loaded, the humidity, the temperature, and the elapsed time included in the processing information.

[0043] In step S102, the control unit 38 resets the change amount of the standby position WP to zero. In step S103, the control unit 38 compares the second recording density with a second density threshold. The second recording density includes the top surface recording density of the second medium 17b and the bottom surface recording density of the second medium 17b. In step S103, the control unit 38 compares the larger of the top surface recording density and the bottom surface recording density as the second recording density with the second density threshold.

[0044] In step S103, if the second recording density is greater than the second density threshold, step S103 becomes NO, and the control unit 38 proceeds to step S104. In step S104, the control unit 38 sets the change amount of the standby position WP to the maximum value, and proceeds to step S109.

[0045] In step S103, if the second recording density is equal to or lower than the second density threshold, step S103 becomes YES, and the control unit 38 transitions the process to step S105. In step S105, the control unit 38 executes the recording surface adjustment subroutine shown in FIG. 4. In step S106, the control unit 38 executes the number of sheets adjustment subroutine shown in FIG. 5. In step S107, the control unit 38 executes the humidity adjustment subroutine shown in FIG. 6. In step S108, the control unit 38 executes the elapsed time adjustment subroutine shown in FIG. 7.

[0046] In step S109, 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 S110, the control unit 38 judges 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 is insufficient for the processing number, step S110 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 top surface recording density of the previous second medium 17b as the top surface recording density of the next first medium 17a, and reacquires the bottom surface recording density of the previous second medium 17b as the bottom surface recording density of the next first medium 17a.

[0047] When the number of stacked sheets reaches the number of sheets to be processed, step S110 becomes YES, and control unit 38 transitions the process to step S111. In step S111, control unit 38 causes post-processing unit 33 to perform post-processing on the multiple first media 17a on processing tray 24. In step S112, 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.

[0048] In step S113, 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 S113 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 S113 becomes YES, and the control unit 38 ends the alignment routine.

[0049] [Recording surface adjustment subroutine] The recording surface adjustment subroutine will be described with reference to the flowchart shown in Fig. 4. The first density threshold and density difference threshold used for comparison in the recording surface adjustment subroutine are set in advance based on, for example, experimental results.

[0050] In step S201, the control unit 38 determines whether the uppermost first medium 17a among the first media 17a stacked on the processing tray 24 is one that has been recorded on one side or one that has been recorded on both sides. If it is one-sided, step S201 becomes YES, and the control unit 38 proceeds to step S202.

[0051] In step S202, the control unit 38 compares the first recording density with the first density threshold. Specifically, the control unit 38 compares the higher of the upper surface recording density and the lower surface recording density of the first medium 17a as the first recording density with the first density threshold. In the case of single-sided recording, the upper surface recording density is 0%, so the control unit 38 compares the lower surface recording density with the first density threshold.

[0052] If the first recording density is equal to or greater than the first density threshold, step S202 becomes YES, and the control unit 38 proceeds to step S203. In step S203, the control unit 38 adds the first recording surface adjustment value to the change amount. If the first recording density is less than the first density threshold, step S202 becomes NO, and the control unit 38 ends the process.

[0053] In step S201, if the first medium 17a is double-sided, the result of step S201 becomes NO, and the control unit 38 proceeds to step S204. In step S204, the control unit 38 compares the density difference, which is the difference between the upper surface recording density and the lower surface recording density of the first medium 17a, with a density difference threshold.

[0054] If the density difference is less than the density difference threshold, step S204 becomes NO, and the control unit 38 proceeds to step S202. If the density difference is equal to or greater than the density difference threshold, step S204 becomes YES, and the control unit 38 proceeds to step S205. In step S205, the control unit 38 compares the lower surface recording density and the upper surface recording density of the first medium 17a.

[0055] If the lower surface recording density is higher than the upper surface recording density, step S205 becomes YES, and the control unit 38 moves the process to step S206. In step S206, the control unit 38 adds the second recording surface adjustment value to the change amount and ends the process. The second recording surface adjustment value may be equal to or smaller than the first recording surface adjustment value.

[0056] If the lower surface recording density is equal to or lower than the upper surface recording density, step S205 becomes NO, and the control unit 38 moves the process to step S207. In step S207, the control unit 38 adds the third recording surface adjustment value to the change amount, and ends the process. The third recording surface adjustment value may be equal to or lower than the second recording surface adjustment value.

[0057] [Quantity adjustment subroutine] The number of sheets adjustment subroutine will be described with reference to the flowchart shown in Fig. 5. The stacking threshold and the number of sheets density thresholds used for comparison in the number of sheets adjustment subroutine are set in advance based on, for example, experimental results. The first recording density is the higher of the upper surface recording density and the lower surface recording density of the first medium 17a.

[0058] In step S301, the control unit 38 compares the number of first media 17a stacked on the processing tray 24 with the stacking threshold. If the number of stacked sheets is equal to or less than the stacking threshold, step S301 becomes YES, and the control unit 38 proceeds to step S302. In step S302, the control unit 38 compares the first recording density with the first sheet number density threshold.

[0059] If the first recording density is lower than the first sheet number density threshold, step S302 becomes NO, and the control unit 38 ends the process. If the first recording density is equal to or greater than the first sheet number density threshold, step S302 becomes YES, and the control unit 38 proceeds to step S303. In step S303, the control unit 38 adds the first sheet number adjustment value to the change amount.

[0060] In step S304, the control unit 38 compares the first recording density with the second number-of-sheets density threshold. If the first recording density is lower than the second number-of-sheets density threshold, step S304 becomes NO, and the control unit 38 ends the process. If the first recording density is equal to or greater than the second number-of-sheets density threshold, step S304 becomes YES, and the control unit 38 moves the process to step S305. In step S305, the control unit 38 adds the second number-of-sheets adjustment value to the change amount, and ends the process.

[0061] In step S301, if the number of stacked sheets is greater than the stacking threshold, step S301 becomes NO, and the control unit 38 moves the process to step S306. In step S306, the control unit 38 compares the first recording density with a third sheet number density threshold.

[0062] If the first recording density is lower than the third sheet number density threshold, step S306 becomes NO, and the control unit 38 ends the process. If the first recording density is equal to or greater than the third sheet number density threshold, step S306 becomes YES, and the control unit 38 proceeds to step S307. In step S307, the control unit 38 adds the third sheet number adjustment value to the change amount.

[0063] In step S308, the control unit 38 compares the first recording density with the fourth sheet number density threshold. If the first recording density is lower than the fourth sheet number density threshold, step S308 becomes NO, and the control unit 38 ends the process. If the first recording density is equal to or greater than the fourth sheet number density threshold, step S308 becomes YES, and the control unit 38 proceeds to step S309. In step S309, the control unit 38 adds the fourth sheet number adjustment value to the change amount.

[0064] [Humidity adjustment subroutine] The humidity adjustment subroutine will be described with reference to the flowchart shown in Fig. 6. The temperature threshold value and humidity threshold value used for comparison in the humidity adjustment subroutine are set in advance based on, for example, experimental results.

[0065] In step S401, the control unit 38 compares the temperature with the temperature threshold. If the temperature is equal to or higher than the temperature threshold, step S401 becomes YES, and the control unit 38 proceeds to step S402. If the temperature is lower than the temperature threshold, step S401 becomes NO, and the control unit 38 proceeds to step S405.

[0066] The control unit 38 performs the same process in steps S402 and S405. Specifically, the control unit 38 compares the humidity with the humidity threshold value. 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 S401 and S402 are YES. In step S403, the control unit 38 adds the first humidity adjustment value to the change amount.

[0067] If the temperature is equal to or higher than the temperature threshold and the humidity is lower than the humidity threshold, step S401 becomes YES and step S402 becomes NO. In step S404, the control unit 38 adds the second humidity adjustment value to the change amount.

[0068] If the temperature is lower than the temperature threshold and the humidity is equal to or higher than the humidity threshold, step S401 becomes NO and step S405 becomes YES. In step S406, the control unit 38 adds the third humidity adjustment value to the change amount. If the temperature is lower than the temperature threshold and the humidity is lower than the humidity threshold, step S401 and step S405 become NO, and the control unit 38 ends the process.

[0069] [Elapsed time adjustment subroutine] The elapsed time adjustment subroutine will now be described with reference to the flowchart shown in Fig. 7. The time threshold used for comparison in the elapsed time adjustment subroutine is set in advance based on, for example, experimental results.

[0070] In step S501, the control unit 38 compares the elapsed time with the time threshold. If the elapsed time is equal to or greater than the time threshold, step S501 becomes YES, and the control unit 38 ends the process. If the elapsed time is shorter than the time threshold, step S501 becomes NO, and the control unit 38 moves the process to step S502. In step S502, the control unit 38 adds a time adjustment value to the change amount.

[0071] [Standby position adjustment] 2, the control unit 38 changes the standby position WP by adjusting the amount of change relative to the reference position. In this embodiment, the distance between the transport unit 31 and the processing tray 24 refers to the distance from the lower end of the transport unit 31 to the processing tray 24 in the vertical direction Z. The distance between the transport unit 31 located at the reference position and the processing tray 24 is, for example, 10 mm. The maximum amount of change is, for example, 70 mm.

[0072] [Second medium] When the second recording density of the second medium 17b discharged from the first discharge unit 23 is greater than the second density threshold, the control unit 38 sets the change amount to the maximum value. When the second medium 17b is a single-sided medium, the lower surface recording density of the recorded surface, that is, the second recording density. When the second medium 17b is a double-sided medium, the larger of the upper surface recording density and the lower surface recording density, becomes the second recording density. The second density threshold is a value that is preset and stored in the control unit 38, and is, for example, 70%.

[0073] [Table 1] As shown in Table 1, when the second recording density is greater than 70%, the control unit 38 sets the change amount to 70 mm. When the second recording density is 70% or less, the control unit 38 sets the change amount to 0 mm. In other words, when the second recording density is equal to or less than the second density threshold, the control unit 38 increases the distance between the standby position WP and the processing tray 24 based on the first recording density of the first medium 17a, not the second recording density of the second medium 17b.

[0074] [Recording surface of the first medium] When the first medium 17a is single-sided, and when the upper surface recording density and the lower surface recording density of the double-sided first medium 17a are smaller than the density difference threshold, the control unit 38 compares the first recording density with the first density threshold.

[0075] When the first medium 17a is a single-sided recording medium, the lower surface recording density of the lower surface, which is the recorded surface, becomes the first recording density. When the first medium 17a is a double-sided recording medium, the larger of the upper surface recording density and the lower surface recording density becomes the first recording density. The first density threshold and the density difference threshold are values ​​that are set in advance and stored in the control unit 38. The first density difference threshold is, for example, 70%. The density difference threshold is, for example, 20%. When the first recording density is equal to or greater than the first density threshold, the control unit 38 increases the distance between the standby position WP and the processing tray 24 compared to when the first recording density is lower than the first density threshold. That is, when the first recording density is equal to or greater than the first density threshold, the control unit 38 increases the change amount of the standby position WP relative to the reference position compared to when the first recording density is lower than the first threshold.

[0076] [Table 2] As shown in Table 2, when the first recording density is 70% or more, the control unit 38 adds the first recording surface adjustment value, for example, 3 mm, to the change amount. When the first recording density is less than 70%, the control unit 38 sets the change amount to 0 mm.

[0077] When the first medium 17a is double-sided and the upper surface recording density and the lower surface recording density of the first medium 17a are equal to or greater than the density difference threshold, the control unit 38 compares the upper surface recording density and the lower surface recording density of the first medium 17a. When the lower surface recording density is higher than the upper surface recording density by the density difference threshold or more, the control unit 38 increases the distance between the standby position WP and the processing tray 24. In other words, the control unit 38 increases the amount of change when the lower surface recording density is higher than the upper surface recording density by the density difference threshold or more than when the lower surface recording density is lower than the upper surface recording density.

[0078] [Table 3] As shown in Table 3, if the lower surface recording density is greater than the upper surface recording density, the control unit 38 adds the second recording surface adjustment value of 2 mm to the change amount. If the lower surface recording density is less than the upper surface recording density, the control unit 38 adds the third recording surface adjustment value of 1 mm to the change amount.

[0079] [Number of sheets in the first media] The control unit 38 adjusts the change amount based on the number of first media 17a stacked on the processing tray 24. The control unit 38 stores a preset stacking threshold, four number density thresholds, and four number adjustment values. The stacking threshold in this embodiment is, for example, 30 sheets. The four number adjustment values ​​may be the same value or different values. All four number adjustment values ​​in this embodiment are 20 mm.

[0080] In this embodiment, the sheet number density threshold to be compared with the first recording density is changed according to the number of stacked sheets. That is, when the number of stacked sheets is equal to or less than the stacking threshold, the control unit 38 compares the first recording density with the first sheet number density threshold and the second sheet number density threshold. When the number of stacked sheets is greater than the stacking threshold, the control unit 38 compares the first recording density with the third sheet number density threshold and the fourth sheet number density threshold.

[0081] The first sheet number concentration threshold is lower than the second sheet number concentration threshold. The third sheet number concentration threshold is lower than the first sheet number concentration threshold. The fourth sheet number concentration threshold may be higher than the first sheet number concentration threshold and lower than the second sheet number concentration threshold. In this embodiment, the first sheet number concentration threshold is 30%, the second sheet number concentration threshold is 70%, the third sheet number concentration threshold is 20 percent, and the fourth sheet number concentration threshold is 60%.

[0082] [Table 4] Table 4 shows the case where the number of loaded sheets is equal to or less than the loading threshold, that is, the case where the number of loaded sheets is 1 to 30.

[0083] When the first recording density is 70% or more, the control unit 38 adds the first number adjustment value of 20 mm and the second number adjustment value of 20 mm to the change amount. That is, the control unit 38 adds 40 mm to the change amount.

[0084] When the first recording density is equal to or greater than 30% and less than 70%, the control unit 38 adds 20 mm, which is the first number adjustment value. When the first recording density is less than 30%, the control unit 38 sets the change amount to 0 mm.

[0085] [Table 5] Table 5 shows the case where the number of loaded sheets is greater than the loading threshold, i.e., 31 or more sheets.

[0086] When the first recording density is 60% or more, the control unit 38 adds the third number adjustment value of 20 mm and the fourth number adjustment value of 20 mm to the change amount. That is, the control unit 38 adds 40 mm to the change amount.

[0087] When the first recording density is equal to or greater than 20% and less than 60%, the control unit 38 adds 20 mm, which is the third number adjustment value. When the first recording density is less than 20%, the control unit 38 sets the change amount to 0 mm.

[0088] [Humidity and Temperature] The control unit 38 adjusts the amount of change based on the temperature and humidity. The control unit 38 stores a preset temperature threshold, humidity threshold, and multiple humidity adjustment values. In this embodiment, the temperature threshold is 20°C, and the humidity threshold is 45%. When the humidity is equal to or higher than the humidity threshold, the control unit 38 increases the distance between the standby position WP and the processing tray 24. In other words, when the humidity is equal to or higher than the humidity threshold, the control unit 38 increases the amount of change compared to when the humidity is below the humidity threshold.

[0089] [Table 6] As shown in Table 6, when the temperature is 20°C or higher and the humidity is 45% or higher, the control unit 38 adds a first humidity adjustment value, for example, 3mm, to the change amount. When the temperature is 20°C or higher and the humidity is less than 45%, the control unit 38 adds a second temperature adjustment value, for example, 2mm, which is smaller than the first humidity adjustment value, to the change amount.

[0090] When the temperature is less than 20°C and the humidity is 45% or more, the control unit 38 adds a third humidity adjustment value smaller than the second humidity adjustment value, for example, 1 mm, to the change amount. When the temperature is less than 20°C and the humidity is less than 45%, the control unit 38 sets the change amount to 0 mm.

[0091] [Elapsed Time] The control unit 38 adjusts the amount of change based on the elapsed time since recording on the first medium 17a. The control unit 38 stores a preset time threshold and a time adjustment value. In this embodiment, the time threshold is one minute. When the elapsed time is shorter than the time threshold, the control unit 38 increases the distance between the standby position WP and the processing tray 24. In other words, when the elapsed time is shorter than the time threshold, the control unit 38 increases the amount of change compared to when the elapsed time is equal to or greater than the time threshold.

[0092] [Table 7] As shown in Table 7, if the elapsed time is 1 minute or more, the control unit 38 sets the change amount to 0 mm. If the elapsed time is less than 1 minute, the control unit 38 adds a time adjustment value, for example 1 mm, to the change amount.

[0093] [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.

[0094] 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.

[0095] 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 it, 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 position change unit 32 to move the transport unit 31 to the standby position WP. The standby position WP at this time is a position that is away from the processing tray 24 by the calculated change amount with respect to the reference position.

[0096] For example, when the second recording density of the second medium 17b is less than the second density threshold, the first recording density of the first medium 17a recorded on one side is equal to or greater than the first density threshold, the number of sheets stacked on the processing tray 24 is equal to or less than the stacking threshold, the temperature is equal to or greater than the temperature threshold, the humidity is equal to or greater than the humidity threshold, and the elapsed time is less than one minute, the change amount is 47 mm. That is, the change amount is a value obtained by adding the first recording surface adjustment value of 3 mm, the first number adjustment value of 20 mm, the second number adjustment value of 20 mm, the first temperature adjustment value of 3 mm, and the time adjustment value of 1 mm. Therefore, the transport unit 31 located at the standby position WP is located at a position 47 mm away from the reference position 10 mm away from the processing tray 24, and 57 mm away from the processing tray 24.

[0097] 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.

[0098] 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 positioned at the transport position TP comes into contact with the upper surface of the second medium 17b placed on the processing tray 24.

[0099] 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.

[0100] 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.

[0101] 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.

[0102] The effects of this embodiment will be described. (1) The magnitude of curl of the first medium 17a loaded on the processing tray 24 changes depending on the processing of the first medium 17a. The control unit 38 changes the standby position WP of the transport unit 31 based on processing information related to the processing performed on the first medium 17a. In other words, the control unit 38 can cause the transport unit 31 to wait at a standby position WP that takes into consideration the effect that the curl of the aligned first medium 17a loaded on the processing tray 24 will have on the second medium 17b that is aligned following the first medium 17a. This reduces the risk of the medium 17 hitting the transport unit 31 positioned at the standby position WP and damaging the image recorded on the medium 17.

[0103] (2) When the recording density is high, the curl of the medium 17 is more likely to occur than when the recording density is low. In this regard, when the first recording density of the first medium 17a is equal to or higher than the first density threshold, the control unit 38 increases the distance between the standby position WP and the processing tray 24 compared to when the first recording density is lower than the first density threshold. In other words, by moving the standby position WP away from the processing tray 24, it is possible to reduce the risk that the second medium 17b discharged onto the first medium 17a will hit the transport unit 31 located at the standby position WP, even if the first medium 17a is curled.

[0104] (3) When the difference between the upper surface recording density and the lower surface recording density is large, the first medium 17a is more likely to curl than when the difference is small. The manner in which the first medium 17a curls depends on whether the upper surface recording density or the lower surface recording density is higher. For example, when the lower surface recording density is lower than the upper surface recording density, the first medium 17a is more likely to curl with the center portion rising. When the lower surface recording density is higher than the upper surface recording density, the first medium 17a is more likely to curl with the end portion rising. The curl with the center portion rising is less likely to be large due to the weight of the first medium 17a, whereas the curl with the end portion rising is more likely to be large than the curl with the center portion rising. In this regard, when the lower surface recording density is higher than the upper surface recording density by the density difference threshold or more, the control unit 38 increases the distance between the standby position WP and the processing tray 24. Therefore, even when the first medium 17a is more likely to curl, the risk of the second medium 17b discharged onto the first medium 17a hitting the transport unit 31 located at the standby position WP can be reduced.

[0105] (4) When the recording density is low, curling is less likely to occur. However, when the curl of the first medium 17a is large, even if the curl of the second medium 17b is small, there is a risk that the second medium 17b will hit the transport unit 31. In this regard, the control unit 38 changes the standby position WP based on the first recording density, even if the second recording density is equal to or lower than the second density threshold. Therefore, it is possible to reduce the risk that the second medium 17b will hit the transport unit 31 located at the standby position WP.

[0106] (5) The second medium 17b discharged from the first discharge unit 23 is placed on top of the first medium 17a stacked on the processing tray 24. Therefore, the number of first media 17a affects the position of the second medium 17b relative to the processing tray 24. The control unit 38 changes the standby position WP based on the number of first media 17a. Therefore, the transport unit 31 can be made to wait at the standby position WP that takes into account the position of the second medium 17b placed on the first medium 17a.

[0107] (6) In the case of medium 17 that absorbs moisture, water vapor in the air is absorbed by medium 17, which may cause medium 17 to swell and wave. When medium 17 swells and waves, the distance between medium 17 and conveying unit 31 becomes shorter. When the humidity is high, medium 17 is more likely to absorb water vapor than when the humidity is low. In this regard, the processing information includes humidity information. Control unit 38 can change standby position WP based on the humidity, and can cause conveying unit 31 to wait at a standby position WP that takes into account the effect of water vapor in the air.

[0108] (7) Recorded medium 17 may dry over time, causing curling to converge. Control unit 38 changes standby position WP based on the time elapsed since recording unit 21 recorded on first medium 17a. In other words, conveyance unit 31 can be made to wait at standby position WP that takes into account the passage of time.

[0109] 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 set the loading threshold value smaller or the number adjustment value larger than when medium 17 is thin.

[0110] The processing information may include resolution information regarding the resolution of the image to be recorded. When the resolution is high, the size of 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, the control unit 38 may increase the amount of change in the standby position WP when the resolution is low and the transport time is short compared to when the resolution is high and the transport time is long.

[0111] 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 amount of change of the standby position WP 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 humidity. The control unit 38 may calculate the amount of water vapor from air temperature and humidity. The water vapor threshold may be a value calculated from the humidity threshold and the air temperature threshold.

[0112] The control unit 38 may control the position changing unit 32 to change the standby position WP based on at least one of the first recording density, the number of stacked sheets, humidity, temperature, and elapsed time. The control unit 38 may store multiple time adjustment values. For example, the control unit 38 may add a first time adjustment value to the amount of change when the elapsed time is equal to or greater than the time threshold, and may add a second time adjustment value larger than the first time adjustment value to the amount of change when the elapsed time is shorter than the time threshold. The control unit 38 may store multiple time thresholds and change the amount of change in multiple stages.

[0113] 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.

[0114] The control unit 38 may change the standby position WP based on information related to the process performed on the first medium 17a, regardless of the second recording density of the second medium 17b. The second recording density of the second medium 17b may be the sum of the recording density of the top surface of the second medium 17b and the recording density of the bottom surface of the second medium 17b. The second recording density may be an average of the recording density of the top surface of the second medium 17b and the recording density of the bottom surface of the second medium 17b, or may be one of the two that is determined in advance.

[0115] The first recording density of the first medium 17a may be the sum of the recording density of the top surface of the first medium 17a and the recording density of the bottom surface of the first medium 17a. The first recording density may be an average of the recording density of the top surface of the first medium 17a and the recording density of the bottom surface of the first medium 17a, or may be one of the two that is determined in advance.

[0116] The first recording density used for comparison in the matching routine may be an average of the first recording densities of the multiple first media 17a loaded on the processing tray 24. The control unit 38 may change the standby position WP regardless of whether the bottom surface recording density or the top surface recording density of the first medium 17a is higher. The control unit 38 may change the standby position WP by a larger amount when the top surface recording density is higher than the bottom surface recording density than when the top surface recording density is lower than the bottom surface recording density.

[0117] The first recording density includes an upper surface recording density on the upper surface of the first medium 17a and a lower surface recording density on the lower surface of the first medium 17a, and the control unit 38 may increase the distance between the waiting position WP and the processing tray 24 when the density difference between the lower surface recording density and the upper surface recording density is equal to or greater than a density difference threshold.

[0118] The first recording density includes an upper surface recording density on the upper surface of the first medium 17a and a lower surface recording density on the lower surface of the first medium 17a, and the control unit 38 may increase the distance between the waiting position WP and the processing tray 24 when the upper surface recording density is higher than the lower surface recording density by more than the density difference threshold value.

[0119] When calculating the first recording density, the recording area of ​​the medium 17 may be divided into a plurality of areas, and only a portion of the areas may be used. Specifically, the first recording density of the area where the first medium 17a and the conveying unit 31 face each other may be calculated and used. The area where the first medium 17a and the conveying unit 31 face each other may be a peripheral area including the position where the first medium 17a and the conveying unit 31 face each other. The peripheral area here may be an area including the position where the first medium 17a and the conveying unit 31 face each other, and may be an area that extends a predetermined distance from the downstream end of the first medium 17a in the alignment direction D3 toward the second discharge direction D2. Then, the waiting position WP of the conveying unit 31 may be changed based on the first recording density calculated here.

[0120] The technical ideas and effects obtained from the above-described embodiment and modified examples will be described below. (A) A post-processing device includes a discharge unit that discharges a medium recorded by a recording unit that performs recording 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, and a post-processing unit that performs post-processing on the medium on the processing tray, wherein the position change unit is capable of moving the transport unit to a transport position where the medium is transported and a waiting position that is farther from the processing tray than the transport position, and the control unit changes the waiting position based on processing information regarding the processing to be performed on the medium, and the processing information includes information regarding the processing to be performed on the first medium, between a first medium that has been aligned and a second medium that has not yet been aligned.

[0121] The magnitude of the curl of the first medium loaded on the processing tray changes depending on the processing of the first medium. According to this configuration, the control unit changes the standby position of the transport unit based on processing information related to the processing performed on the first medium. In other words, the control unit can cause the transport unit to wait at a standby position that takes into consideration the effect that the curl of the aligned first medium loaded on the processing tray will have on the second medium that is aligned following the first medium. This reduces the risk of the medium hitting the transport unit located at the standby position and damaging the image recorded on the medium.

[0122] (B) In the post-processing device, the processing information may include a first recording density of the first medium, and the control unit may increase the distance between the standby position and the processing tray when the first recording density is equal to or greater than a first density threshold, compared to when the first recording density is lower than the first density threshold.

[0123] When the recording density is high, the medium is more likely to curl than when the recording density is low. In this regard, with this configuration, when the first recording density of the first medium is equal to or higher than the first density threshold, the control unit increases the distance between the standby position and the processing tray compared to when the first recording density is lower than the first density threshold. In other words, by moving the standby position away from the processing tray, it is possible to reduce the risk that the second medium discharged onto the first medium will hit the transport unit located at the standby position, even if the first medium is curled.

[0124] (C) In the post-processing device, the first recording density includes an upper surface recording density of an upper surface of the first medium and a lower surface recording density of a lower surface of the first medium, and the control unit may increase the distance between the standby position and the processing tray when a density difference between the lower surface recording density and the upper surface recording density is equal to or greater than a density difference threshold.

[0125] The first medium is more likely to curl when the difference between the upper surface recording density and the lower surface recording density is large than when the difference is small. With this configuration, the control unit increases the distance between the standby position and the processing tray when the density difference between the lower surface recording density and the upper surface recording density is greater than or equal to the density difference threshold. Therefore, even when the first medium is more likely to curl, it is possible to reduce the risk that the second medium discharged onto the first medium will hit the transport unit located at the standby position.

[0126] (D) In ​​the post-processing device, the control unit may increase the distance between the standby position and the processing tray when the lower surface recording density is higher than the upper surface recording density by a density difference threshold or more.

[0127] The manner of curling varies depending on whether the upper surface recording density or the lower surface recording density is higher. For example, when the lower surface recording density is lower than the upper surface recording density, the first medium is likely to curl with the center portion rising. When the lower surface recording density is higher than the upper surface recording density, the first medium is likely to curl with the end portion rising. The curl with the center portion rising is unlikely to become large due to the weight of the first medium, whereas the curl with the end portion rising is more likely to become large than the curl with the center portion rising. In this respect, according to this configuration, when the lower surface recording density is higher than the upper surface recording density by the density difference threshold or more, the control unit increases the distance between the standby position and the processing tray. Therefore, even when the first medium is likely to curl large, the risk of the second medium discharged on top of the first medium hitting the transport unit located at the standby position can be reduced.

[0128] (E) In the post-processing device, the processing information may include a second recording density of the second medium, and the control unit may increase the distance between the standby position and the processing tray based on the first recording density when the second recording density is equal to or less than a second density threshold.

[0129] When the recording density is low, the curl is less likely to become large. However, when the curl of the first medium is large, there is a risk that the second medium will hit the transport section even if the curl of the second medium is small. In this regard, with this configuration, the control unit changes the standby position based on the first recording density even if the second recording density is equal to or lower than the second density threshold. Therefore, it is possible to reduce the risk that the second medium will hit the transport section located at the standby position.

[0130] (F) In the post-processing device, the processing information may include humidity information regarding humidity, and the control unit may increase a distance between the standby position and the processing tray when the humidity is equal to or greater than a humidity threshold value.

[0131] In the case of a hygroscopic medium, water vapor in the air is absorbed by the medium, which may cause the medium to swell and wave. When the medium swells and waves, the distance between the medium and the transport unit becomes shorter. 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 standby position based on the humidity, and can cause the transport unit to wait at a standby position that takes into account the effect of water vapor in the air.

[0132] (G) In the post-processing device, the processing information may include an elapsed time since the recording unit recorded on the first medium, and the control unit may increase the distance between the standby position and the processing tray when the elapsed time is shorter than a time threshold value.

[0133] The recorded medium may dry over time, causing the curl to converge. With this configuration, the control unit changes the standby position based on the elapsed time since the recording unit recorded on the first medium. In other words, the transport unit can be made to wait at a standby position that takes the passage of time into consideration. [Explanation of symbols]

[0134] 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; a post-processing section for performing post-processing on the medium on the processing tray; Equipped with the position changing unit is capable of moving the transport unit between a transport position where the medium is transported and a standby position that is farther away from the processing tray than the transport position; The control unit changes the standby position based on processing information related to a process performed on the medium, the processing information includes a first recording density of the first medium as information on a processing performed on the first medium, which is the uppermost of the aligned first medium and the unaligned second medium; the first recording density includes an upper surface recording density of an upper surface of the first medium and a lower surface recording density of a lower surface of the first medium, The post-processing device, wherein the control unit increases a distance between the standby position and the processing tray when a density difference between the lower surface recording density and the upper surface recording density is equal to or greater than a density difference threshold value.

2. The post-processing device described in Claim 1, characterized in that when the concentration difference is less than the concentration difference threshold and the first recording concentration is equal to or greater than the first concentration threshold, the control unit increases the distance between the waiting position and the processing tray compared to when the first recording concentration is lower than the first concentration threshold.

3. The post-processing device according to claim 1 or claim 2, characterized in that when the density difference is equal to or greater than the density difference threshold and the lower surface recording density is higher than the upper surface recording density by equal to or greater than the density difference threshold, the control unit increases the distance between the waiting position and the processing tray compared to when the lower surface recording density is lower than the upper surface recording density.

4. the processing information includes a second recording density of the second medium, 4 . The post-processing device according to claim 3 , wherein the control unit increases the distance between the standby position and the processing tray based on the first recording density when the second recording density is equal to or lower than a second density threshold value.

5. A post-processing device as described in any one of claims 1 to 4, characterized in that the control unit increases the distance between the waiting position and the processing tray when the humidity is equal to or higher than a humidity threshold value.

6. A post-processing device as described in any one of claims 1 to 5, characterized in that the control unit increases the distance between the standby position and the processing tray when the elapsed time since the recording unit recorded on the first medium is shorter than a time threshold value.

Images