Medium conveying device, recording device, recording system, and method for controlling medium conveying device

Abstract

The invention provides a medium transport device, a recording device, a recording system, and a method for controlling the medium transport device, which can improve the transport performance of a medium. The medium transport device includes a transport unit that transports a medium, and a control unit that controls the transport unit. The transport unit includes a first transport unit that transports the medium, and a second transport unit that transports the medium downstream of the first transport unit. The control unit selects, on the basis of the difference between the reference arrival time and the arrival time at which the medium arrives at a predetermined position downstream of the first transport unit, the transport speed of the medium by the second transport unit from a plurality of predetermined correction transport speeds. On the basis of the difference and the selected correction conveyance speed, the control unit calculates a correction conveyance time at which the medium is conveyed at the correction conveyance speed.

Description

Technical Field

[0001] This invention relates to a media conveying device, a recording device, a recording system, and a control method for the media conveying device. Background Technology

[0002] For example, as disclosed in Patent Document 1, a media conveying device adjusts the conveying speed of subsequent media based on the difference between the arrival time of a preceding medium at a predetermined position and a reference arrival time. This allows for increased throughput by targeting subsequent media.

[0003] However, in such media conveying devices, calculating the corrected conveying speed becomes complex. Therefore, there is a possibility that the media may not be conveyed smoothly. Thus, a technology to improve the media conveying performance is desired.

[0004] Patent Document 1: Japanese Patent Application Publication No. 2021-187588 Summary of the Invention A media conveying apparatus for solving the above-mentioned problems includes: a conveying unit for conveying a medium; and a control unit for controlling the conveying unit. The conveying unit has a first conveying unit for conveying the medium and a second conveying unit for conveying the medium downstream of the first conveying unit. The control unit selects a conveying speed of the medium implemented by the second conveying unit from a variety of pre-defined corrected conveying speeds based on the difference between the arrival time of the medium at a predetermined position downstream of the first conveying unit and a reference arrival time. Furthermore, the control unit calculates a corrected conveying time for conveying the medium at the corrected conveying speed based on the difference and the selected corrected conveying speed.

[0005] A recording apparatus for solving the above-mentioned problems includes: a conveying unit for conveying a medium; a recording unit for recording the medium conveyed by the conveying unit; and a control unit for controlling the conveying unit and the recording unit. The conveying unit has a first conveying unit for conveying the medium and a second conveying unit for conveying the medium downstream of the first conveying unit. The control unit selects a conveying speed of the medium implemented by the second conveying unit from a variety of pre-defined corrected conveying speeds based on the difference between the arrival time of the medium at a predetermined position downstream of the first conveying unit and a reference arrival time. Furthermore, the control unit calculates a corrected conveying time for conveying the medium at the corrected conveying speed based on the difference and the selected corrected conveying speed.

[0006] A recording system for solving the above-mentioned problems includes: a conveying unit for conveying a medium; a recording unit for recording the medium conveyed by the conveying unit; a post-processing unit for post-processing the medium recorded by the recording unit; and a control unit for controlling the conveying unit, the recording unit, and the post-processing unit. The conveying unit has a first conveying unit for conveying the medium and a second conveying unit for conveying the medium downstream of the first conveying unit. The control unit selects a conveying speed of the medium implemented by the second conveying unit from a variety of pre-defined corrected conveying speeds based on the difference between the arrival time of the medium at a predetermined position downstream of the first conveying unit and a reference arrival time. Furthermore, the control unit calculates a corrected conveying time for conveying the medium at the corrected conveying speed based on the difference and the selected corrected conveying speed.

[0007] In the control method of the medium conveying device for solving the above-mentioned problems, the medium conveying device includes a first conveying section for conveying the medium and a second conveying section for conveying the medium downstream of the first conveying section. The control method of the medium conveying device includes the following processing: selecting a medium conveying speed implemented by the second conveying section from a variety of pre-defined corrected conveying speeds based on the difference between the arrival time of the medium at a predetermined position downstream of the first conveying section and a reference arrival time; and calculating a corrected conveying time for conveying the medium at the corrected conveying speed based on the difference and the selected corrected conveying speed. Attached Figure Description

[0008] Figure 1 This is a schematic diagram illustrating the recording apparatus of the first embodiment.

[0009] Figure 2 This is a schematic diagram illustrating the control contents of the second drive unit in the first embodiment.

[0010] Figure 3 This is a schematic diagram illustrating the control contents of the second drive unit in the first embodiment.

[0011] Figure 4 This is a schematic diagram illustrating the control contents of the second drive unit in the first embodiment.

[0012] Figure 5 This is a schematic diagram illustrating the control contents of the second drive unit in the first embodiment.

[0013] Figure 6 This is a schematic diagram illustrating the relationship between the difference between the arrival time and the reference arrival time in the first embodiment and the corrected conveying speed.

[0014] Figure 7This is a flowchart illustrating the data transmission control processing of the first embodiment.

[0015] Figure 8 This is a schematic diagram illustrating the recording system of the second embodiment.

[0016] Figure 9 This is a schematic diagram illustrating the recording device according to the third embodiment.

[0017] Figure 10 This is a schematic diagram illustrating the control contents of the second drive unit in the third embodiment.

[0018] Figure 11 This is a schematic diagram illustrating the control contents of the first drive unit in the third embodiment. Detailed Implementation

[0019] First Implementation Method Hereinafter, an embodiment of a recording apparatus equipped with a media transport device and a control method for the media transport device will be described with reference to the accompanying drawings. In the following description, the structure in which the recording apparatus is placed on a horizontal surface will be explained.

[0020] Structure of recording device 11 like Figure 1 As shown, the recording device 11 is configured to record images on the medium 99. The recording device 11 could also be, for example, an inkjet printer that records images by ejecting ink, an example of a liquid, onto the medium 99.

[0021] The recording device 11 may also include a media storage unit 12. The recording device 11 may also include multiple media storage units 12. The media storage unit 12 is capable of storing media 99. The media storage unit 12 is capable of storing multiple media 99 in a stacked state. The media storage unit 12 may also be a tray capable of holding one or more media 99.

[0022] The recording apparatus 11 includes a media transport device 13. The media transport device 13 is configured to transport a medium 99 for recording images. The media transport device 13 includes a transport section 14. The transport section 14 is configured to transport the medium 99. The transport section 14 transports the medium 99 along a transport path 15 in a transport direction D. The transport path 15 is the path through which the medium 99 is transported. The transport direction D is the direction in which the medium 99 is transported. In the accompanying drawings, the transport path 15 is represented by a dashed line. In this embodiment, upstream refers to the upstream direction of the transport direction D, and downstream refers to the downstream direction of the transport direction D.

[0023] The recording device 11 includes a recording unit 16. The recording unit 16 is configured to record images on the medium 99. The recording unit 16 is configured to record on the medium 99 being transported by the transport unit 14. The recording unit 16 can also record on the medium 99 by spraying liquid onto the medium 99. The recording unit 16 is located along the transport path 15.

[0024] Although the recording unit 16 is a line head type, it can also be a serial head type. The line head type allows liquid to be ejected uniformly into the medium 99 along the crossing direction by a head extending in the crossing direction intersecting with the transport direction D. The serial head type allows liquid to be ejected into the medium 99 while the head moves along the crossing direction.

[0025] The recording device 11 includes a control unit 17. The control unit 17 provides comprehensive control over the recording device 11. The control unit 17 controls various actions performed using the recording device 11. The control unit 17 controls the transport unit 14 and the recording unit 16.

[0026] The control unit 17 can be configured as a circuit, which includes: α: one or more processors that execute various processes according to a computer program; β: one or more dedicated hardware circuits that execute at least a portion of the various processes; or γ: a combination thereof. The hardware circuit is, for example, an application-specific integrated circuit (ASIC). The processor includes memories such as a CPU (Central Processing Unit), RAM (Random Access Memory), and ROM (Read-Only Memory), which store program code or instructions configured to cause the CPU to perform processes. Memory, i.e., computer-readable media, includes all readable media that can be accessed by a general-purpose or special-purpose computer.

[0027] The media transport device 13 may also include a control unit 17. The control unit 17 may not control the recording device 11, but may comprehensively control the media transport device 13. The control unit 17 may also control various actions performed using the media transport device 13.

[0028] The conveying unit 14 includes a first conveying unit 21 and a second conveying unit 22. That is, the recording device 11 and the media conveying device 13 both include a first conveying unit 21 and a second conveying unit 22. The conveying unit 14 may also include a third conveying unit 23 and a discharge conveying unit 24. That is, the recording device 11 and the media conveying device 13 may also include a third conveying unit 23 and a discharge conveying unit 24.

[0029] The first conveying unit 21, the second conveying unit 22, the third conveying unit 23, and the discharge conveying unit 24 are disposed along the conveying path 15. The first conveying unit 21, the second conveying unit 22, the third conveying unit 23, and the discharge conveying unit 24 are arranged sequentially along the conveying path 15 from upstream to downstream.

[0030] The first conveying unit 21 is positioned upstream of the recording unit 16. The second conveying unit 22 is positioned upstream of the recording unit 16. The third conveying unit 23 is positioned spanning both the upstream position and the position opposite to the recording unit 16. In other words, the recording unit 16 records the medium 99 conveyed through the third conveying unit 23. The discharge conveying unit 24 is positioned downstream of the recording unit 16.

[0031] The first conveying unit 21 is located at the upstream end of the conveying path 15. The first conveying unit 21 is configured to convey the medium 99. The first conveying unit 21 is configured to convey the uppermost sheet of medium 99 stored in the medium storage unit 12. The first conveying unit 21 is a feeding unit that feeds the medium 99 stored in the medium storage unit 12. The first conveying unit 21 is configured to convey the medium 99 from the medium storage unit 12 to the second conveying unit 22.

[0032] The first conveying unit 21 includes a feed roller 30 and a first conveying drive unit 31. The feed roller 30 feeds the medium 99 by rotating. The feed roller 30 is arranged in contact with the uppermost sheet of medium 99 loaded on the medium receiving unit 12. The feed roller 30 feeds the medium 99 sheet by sheet from the medium receiving unit 12.

[0033] The first conveying drive unit 31 is connected to the feed roller 30. The first conveying drive unit 31 is a drive source for rotating the feed roller 30. The first conveying drive unit 31 may also be an electric motor. The first conveying drive unit 31 is driven based on a drive signal from the control unit 17, thereby causing the feed roller 30 to rotate.

[0034] The second conveying section 22 is located downstream of the first conveying section 21. The second conveying section 22 is configured to convey the medium 99. The second conveying section 22 is configured to convey the medium 99 from the first conveying section 21 to the third conveying section 23.

[0035] The second conveying unit 22 includes a first roller pair 32, a second roller pair 33, and a second conveying drive unit 34. The second roller pair 33 is located downstream of the first roller pair 32. The first roller pair 32 and the second roller pair 33 convey the medium 99 by rotating.

[0036] The second conveying drive unit 34 is connected to the first roller pair 32. The second conveying drive unit 34 is also connected to the second roller pair 33. The second conveying drive unit 34 is a drive source for rotating the first roller pair 32 and the second roller pair 33. The second conveying drive unit 34 may also be an electric motor. The second conveying drive unit 34 is driven based on a drive signal from the control unit 17, thereby causing the first roller pair 32 and the second roller pair 33 to rotate.

[0037] The third conveying section 23 is located downstream of the second conveying section 22. The third conveying section 23 is configured to convey the medium 99. The third conveying section 23 is configured to convey the medium 99 from the second conveying section 22 to the discharge conveying section 24.

[0038] The third conveying unit 23 has a pair of alignment rollers 35 and a third conveying drive unit 36. That is, the recording device 11 and the media conveying device 13 both have a pair of alignment rollers 35 and a third conveying drive unit 36.

[0039] The alignment roller pair 35 is positioned downstream of the second conveying section 22. The alignment roller pair 35 is contacted by the medium 99 conveyed by the second conveying section 22. The alignment roller pair 35 is configured to correct the slant of the medium 99. The alignment roller pair 35 conveys the medium 99 by rotating.

[0040] The third conveying drive unit 36 ​​is connected to the alignment roller pair 35. The third conveying drive unit 36 ​​is a drive source for rotating the alignment roller pair 35. The third conveying drive unit 36 ​​may also be an electric motor. The third conveying drive unit 36 ​​is driven based on a drive signal from the control unit 17, thereby rotating the alignment roller pair 35.

[0041] The third conveying unit 23 includes a medium support unit 37. The medium support unit 37 is provided at a position along the conveying path 15. The medium support unit 37 is configured to convey the medium 99 while supporting it. The medium support unit 37 is provided at a position opposite the recording unit 16 across the conveying path 15.

[0042] The media support unit 37 may also include a seamless conveyor belt 38 and a pair of pulleys 39. The conveyor belt 38 is mounted on the pair of pulleys 39. The conveyor belt 38 is positioned opposite the recording unit 16 across the conveying path 15. The conveyor belt 38 supports a portion of the media 99 in a flat state. The conveyor belt 38 conveys the media 99 along the conveying path 15 by rotating while adsorbing the media 99. One pulley 39 rotates by a driving force from a belt drive unit (not shown). Thus, the conveyor belt 38 conveys the media 99 along the conveying path 15.

[0043] The media support 37 is rotatable about a pulley 39. The media support 37 is configured such that, by rotating about the pulley 39, it can move between a support position (indicated by a solid line) and a retracted position (indicated by a double-dotted line). The support position is the position where the media 99 is supported and opposed to the recording unit 16. The retracted position is the position where it is separated from the recording unit 16. By moving the media support 37 to the retracted position, maintenance of the recording unit 16, performed by a maintenance device (not shown), is carried out.

[0044] The discharge conveying unit 24 is located downstream of the third conveying unit 23. The discharge conveying unit 24 is configured to convey the medium 99. The discharge conveying unit 24 is configured to convey the medium 99 from the third conveying unit 23 to the outside of the recording device 11.

[0045] The discharge conveying unit 24 includes a discharge roller pair 40. The discharge roller pair 40 conveys the medium 99 by rotating. The discharge roller pair 40 rotates by a driving force from a discharge drive unit (not shown). The discharge drive unit may also be an electric motor.

[0046] The media delivery device 13 includes a first media detection unit 41 and a second media detection unit 42. In other words, the recording device 11 includes a first media detection unit 41 and a second media detection unit 42. The first media detection unit 41 and the second media detection unit 42 can be either physical sensors or optical sensors.

[0047] The first medium detection unit 41 is disposed along the conveying path 15. The first medium detection unit 41 is disposed downstream of the first conveying unit 21. The first medium detection unit 41 is disposed downstream of the first roller pair 32. The first medium detection unit 41 is disposed upstream of the second roller pair 33. In other words, the first medium detection unit 41 is disposed between the first roller pair 32 and the second roller pair 33 along the conveying path 15.

[0048] The first medium detection unit 41 is configured to detect the medium 99 being conveyed along the conveying path 15. Specifically, the first medium detection unit 41 is configured to detect the leading edge of the medium 99. That is, the first medium detection unit 41 detects when the medium 99 is being conveyed through the second conveying unit 22. Hereinafter, the position where the first medium detection unit 41 can detect the medium 99 will be referred to as a predetermined position. The predetermined position can be considered as a position downstream of the first conveying unit 21. The timing at which the first medium detection unit 41 detects the leading edge of the medium 99 will be referred to as a first detection timing.

[0049] The second medium detection unit 42 is disposed along the conveying path 15. The second medium detection unit 42 is disposed downstream of the second conveying unit 22. The second medium detection unit 42 is disposed upstream of the alignment roller pair 35. Alternatively, the second medium detection unit 42 may be disposed upstream of the alignment roller pair 35 by only a small distance.

[0050] The second medium detection unit 42 is configured to detect the medium 99 being conveyed along the conveying path 15. Specifically, the second medium detection unit 42 is configured to detect the leading edge of the medium 99. The second medium detection unit 42 may also be configured to detect the leading edge of the medium 99 that is abutting against the alignment roller pair 35. Hereinafter, the position where the second medium detection unit 42 can detect the medium 99 will be referred to as the detection position. The timing at which the second medium detection unit 42 detects the leading edge of the medium 99 will be referred to as the second detection timing.

[0051] Control functions of the second conveyor unit 22 Here, refer to Figures 2 to 6 The control functions of the second conveying unit 22 will now be explained.

[0052] like Figure 2 As shown, the conveying speed implemented by the second conveying unit 22 is controlled for each medium 99 conveyed along the conveying path 15. The conveying speed implemented by the second conveying unit 22 is controlled according to each control period of the conveyed medium 99.

[0053] The control period includes a first acceleration period T1, a normal conveying period T2, a second acceleration period T3, a corrective conveying period T4, a first deceleration period T5, an approach conveying period T6, and a second deceleration period T7.

[0054] The first acceleration period T1 is the period during which the conveying speed implemented by the second conveying unit 22 is accelerated from 0 to the normal conveying speed v0. The normal conveying period T2 is the period during which the medium 99 is conveyed at the normal conveying speed v0.

[0055] The normal transport speed v0 is the transport speed when receiving medium 99 from the first transport section 21. The normal transport speed v0 is a speed greater than or equal to the transport speed of medium 99 transported through the first transport section 21. The normal transport speed v0 is equal to the transport speed of medium 99 transported through the third transport section 23. In particular, the normal transport speed v0 is equal to the transport speed of medium 99 transported through the media support section 37. That is, the normal transport speed v0 is equal to the transport speed when recording medium 99. Thus, the normal transport speed v0 can be considered the standard transport speed in the recording device 11 and the media transport device 13.

[0056] The second acceleration period T3 is the period during which the conveying speed implemented by the second conveying unit 22 is accelerated to the corrected conveying speed. The corrected conveying period T4 is the period during which the medium 99 is conveyed at the corrected conveying speed. Figure 2 In this case, the conveying speed is corrected to the base speed v1.

[0057] The modified conveying speed is faster than the normal conveying speed v0. Therefore, the conveying speed implemented by the second conveying unit 22 can be increased. This, in turn, increases the throughput of the conveyed medium 99.

[0058] The corrected conveyor speed includes multiple speeds. The corrected conveyor speed can be selected from any of these speeds. The corrected conveyor speed includes... Figure 2 as well as Figure 3 The reference speed v1 shown Figure 4 The high speed v2 shown and Figure 5 The low speed v3 is shown. The reference speed v1 is the speed used as the basis for the corrected conveyor speed. The reference speed v1 is based on the reference arrival time described later. The high speed v2 is faster than the reference speed v1. The low speed v3 is slower than the reference speed v1. The low speed v3 is equal to the contact conveyor speed v3 described later.

[0059] Thus, the reference speed v1, high speed v2, and low speed v3 are faster than the normal conveying speed v0. That is, the reference speed v1, high speed v2, and low speed v3 are faster than the conveying speed implemented by the first conveying unit 21. In other words, the normal conveying speed v0 is slower than the modified conveying speed. The normal conveying speed v0 is slower than the low speed v3 and the contact conveying speed v3.

[0060] The first deceleration period T5 is the period during which the conveying speed implemented by the second conveying unit 22 is reduced from the corrected conveying speed to the contact conveying speed v3. The contact conveying period T6 is the period during which the medium 99 is conveyed at the contact conveying speed v3. The second deceleration period T7 is the period during which the conveying speed implemented by the second conveying unit 22 is reduced from the contact conveying speed v3 to 0.

[0061] The contact conveying speed v3 is the conveying speed at which the medium 99 contacts the alignment roller pair 35 in the second conveying section 22. The contact conveying speed v3 is slower than the reference speed v1 and the high speed v2. The contact conveying speed v3 is equal to the low speed v3.

[0062] During the second deceleration period T7, timing is included for the alignment roller pair 35 to begin re-conveying the medium 99 that is abutted against the alignment roller pair 35. The alignment roller pair 35 conveys the medium 99 at a normal conveying speed v0.

[0063] With the rotation of the positioning roller pair 35 stopped, the second conveying unit 22 brings the medium 99 against the positioning roller pair 35 at an abutting conveying speed v3, causing deflection on the medium 99. During the second deceleration period T7, the deflection on the medium 99 is eliminated by reducing the conveying speed implemented by the second conveying unit 22 from the abutting conveying speed v3 to 0. Although in Figures 2 to 5 The illustration following the timing of symbol T19 is omitted, but the conveying speed implemented by the second conveying unit 22 is accelerated from 0 to the normal conveying speed v0 until the deflection caused by the medium 99 is completely eliminated. By accelerating the conveying speed of the second conveying unit 22 from 0 to the normal conveying speed v0 before the deflection caused by the medium 99 is completely eliminated, it is possible to prevent the second conveying unit 22 from becoming a conveying load. In addition, when multiple sheets of medium 99 are continuously conveyed, the period during which the conveying speed implemented by the second conveying unit 22 is accelerated from 0 to the normal conveying speed v0 before the deflection caused by the medium 99 is completely eliminated corresponds to the first acceleration period T1 for the subsequent medium 99.

[0064] like Figures 2 to 5 As shown, the corrected conveying speed and corrected conveying time are controlled based on the arrival time of the medium 99 at the predetermined position, detected by the first medium detection unit 41. The arrival time is the time from the start of conveying the medium 99 until the medium 99 reaches the predetermined position. That is, the arrival time is the time from the start of conveying the medium 99 by the first conveying unit 21 until the medium 99 reaches the predetermined position. The corrected conveying time is the time for conveying the medium 99 at the corrected conveying speed.

[0065] A reference arrival time is pre-stored in the memory. The reference arrival time is the time that serves as the basis for the arrival time. The reference arrival time is defined as the normal transport period T2. Specifically, the reference arrival time is... Figures 2 to 5 The timing of symbol T12 is shown.

[0066] The corrected conveyor speed and corrected conveyor time are controlled based on the difference between the arrival time and the reference arrival time. Specifically, the difference between the arrival time and the reference arrival time becomes... Figure 3 The second difference Δt2 shown Figure 4 The third difference Δt3 shown, and Figure 5 The fourth difference Δt4 is shown. Figure 2 In this context, the difference between the arrival time and the reference arrival time is 0. Hereinafter, the difference between the arrival time and the reference arrival time will be expressed only as a difference.

[0067] The difference is the value obtained by subtracting the reference arrival time from the arrival time. If the arrival time is longer than the reference arrival time, the difference is a positive value. If the arrival time is shorter than the reference arrival time, the difference is a negative value. Therefore, Figure 3 The second difference Δt2 shown and Figure 4 The third difference Δt3 shown is a positive value. Figure 5 The fourth difference Δt4 shown is a negative value.

[0068] like Figure 6 As shown, the difference is assigned to a difference range. A difference range contains multiple ranges. A difference range may also include a first range, a second range, and a third range.

[0069] The first range is the range where the difference is less than the first threshold and greater than the second threshold. The second range is the range where the difference is above the first threshold. The third range is the range where the difference is below the second threshold. The first threshold is greater than the second threshold. Alternatively, the first threshold can be set to a positive value and the second threshold to a negative value.

[0070] When the differential is included in the first range, a reference speed v1 is selected as the corrected conveying speed. When the differential is included in the second range, a high speed v2 is selected as the corrected conveying speed. When the differential is included in the third range, a low speed v3 is selected as the corrected conveying speed.

[0071] The corrected transport time is controlled to reduce the difference and transport the medium 99 to the third transport unit 23 at an appropriate timing. Preferably, the corrected transport time is controlled to eliminate the difference and transport the medium 99 to the third transport unit 23 at an appropriate timing. Specifically, the corrected transport time is controlled such that the leading edge of the medium 99 is detected by the second medium detection unit 42 at a predetermined second detection timing based on the difference. The second detection timing is... Figures 2 to 5 The timing is indicated by the symbol T17.

[0072] like Figures 2 to 5 As shown, in this embodiment, during the first acceleration period T1 and the second deceleration period T7, the conveying speed of the medium 99 implemented by the second conveying unit 22 is controlled in the same manner, regardless of differential control. In this embodiment, at the timing indicated by the symbol T17, the conveying speed of the medium 99 implemented by the second conveying unit 22 is controlled in the same manner, regardless of differential control, so that the leading edge of the medium 99 is detected at the detection position by the second conveying unit 22.

[0073] Data transmission control processing Next, refer to Figure 7The transmission data control processing will now be explained. The transmission data control processing is executed by the control unit 17 according to each predetermined cycle.

[0074] like Figure 7 As shown, in step S10, the control unit 17 determines whether the tip of the medium 99 is detected at a predetermined position based on the detection signal from the first medium detection unit 41. If the control unit 17 determines that the tip of the medium 99 is not detected at the predetermined position, the data transmission control process ends. If the control unit 17 determines that the tip of the medium 99 is detected at the predetermined position, the process is transferred to step S11.

[0075] In step S11, the control unit 17 performs an arrival time calculation process. In this process, the control unit 17 calculates the arrival time as the time elapsed since the start of transporting the medium 99. Thus, the control unit 17 can calculate the arrival time from the start of transporting the medium 99 until the medium 99 reaches a predetermined position. The control unit 17 stores the arrival time in its memory.

[0076] In step S12, the control unit 17 performs a differential calculation process. In this process, the control unit 17 reads the reference arrival time, which is pre-stored in the memory. The control unit 17 calculates the difference between the calculated arrival time and the reference arrival time. Thus, the control unit 17 can calculate the difference between the arrival time of the medium 99 at the predetermined position and the reference arrival time. The control unit 17 stores the difference in the memory.

[0077] In step S13, the control unit 17 performs a difference determination process. In this process, the control unit 17 determines a difference range that includes the difference calculated in step S12 by referring to a difference range that is pre-stored in the memory.

[0078] Specifically, if the difference is less than a first threshold and greater than a second threshold, the control unit 17 determines that the difference is included in a first range. If the difference is above the first threshold, the control unit 17 determines that the difference is included in a second range. If the difference is below the second threshold, the control unit 17 determines that the difference is included in a third range.

[0079] In step S14, the control unit 17 performs a corrected conveying speed selection process. In this process, the control unit 17 selects a corrected conveying speed from a variety of corrected conveying speeds that corresponds to a differential range containing the differential.

[0080] Specifically, when the differential is included in the first range, the control unit 17 selects a reference speed v1 from a variety of corrected conveying speeds. When the differential is included in the second range, the control unit 17 selects a high speed v2 from a variety of corrected conveying speeds. When the differential is included in the third range, the control unit 17 selects a low speed v3 from a variety of corrected conveying speeds.

[0081] Thus, the control unit 17 selects the conveying speed of the medium 99 implemented by the second conveying unit 22 from a variety of pre-defined modified conveying speeds based on the difference between the arrival time of the medium 99 to the predetermined position and the reference arrival time.

[0082] In step S15, the control unit 17 performs a transport time calculation process. In this process, the control unit 17 calculates the corrected transport time based on the difference calculated in step S12 and the corrected transport speed selected in step S14, in a manner that makes the second detection timing of the second medium detection unit 42 a predetermined time.

[0083] In detail, the control unit 17 calculates the adjustment target time based on the difference calculated in step S12. The adjustment target time is the time from the actual arrival time at the predetermined position to the arrival time at the detection position.

[0084] The control unit 17 calculates the normal conveying time, the corrected conveying time, and the arrival conveying time based on the difference calculated in step S12, the corrected conveying speed selected in step S14, and the calculated adjustment target time. The normal conveying time is the conveying time for conveying the medium 99 at the normal conveying speed v0. The arrival conveying time is the conveying time for conveying the medium 99 at the arrival conveying speed v3.

[0085] In particular, when the corrected conveying speed is not low speed v3, the control unit 17 also calculates the normal conveying time, the corrected conveying time, and the arrival conveying time based on the second acceleration period T3 and the first deceleration period T5.

[0086] The control unit 17 calculates the normal transport time, the corrected transport time, and the arrival transport time by transporting the medium 99 from the predetermined position to the detection position from the actual arrival time to the predetermined second detection time. The control unit 17 calculates the normal transport time, the corrected transport time, and the arrival transport time by using the total value of the normal transport time, the corrected transport time, the arrival transport time, the time of the second acceleration period T3, and the time of the first deceleration period T5 as the adjustment target time.

[0087] The memory stores the time corresponding to the speed before and after acceleration for the second acceleration period T3. The memory stores the time corresponding to the speed before and after acceleration for the first deceleration period T5. The memory stores the distance traveled by the transport medium 99 during the second acceleration period T3, corresponding to the speed before and after acceleration. The memory stores the distance traveled by the transport medium 99 during the first deceleration period T5, corresponding to the speed before and after deceleration.

[0088] When the corrected conveying speed is set to a low speed v3, the control unit 17 also calculates the normal conveying time, the corrected conveying time, and the arrival conveying time based on the second acceleration period T3. In this case, the corrected conveying time becomes the conveying time at the arrival conveying speed v3.

[0089] The control unit 17 calculates the normal transport time and the arrival transport time in a manner that the medium 99 is transported from the predetermined position to the detection position from the actual arrival time to the predetermined second detection time. The arrival transport time includes the correction transport time. The control unit 17 calculates the normal transport time and the arrival transport time in a manner that makes the sum of the normal transport time, the arrival transport time, and the time during the second acceleration period T3 the adjustment target time.

[0090] The memory stores the time corresponding to the speed before acceleration and the speed after acceleration during the second acceleration period T3. Similarly, the memory stores the distance traveled by the transport medium 99 during the second acceleration period T3, corresponding to the speed before acceleration and the speed after acceleration.

[0091] The control unit 17 calculates the normal conveying period T2, the second acceleration period T3, the corrected conveying period T4, the first deceleration period T5, and the arrival conveying period T6 based on the calculated normal conveying time, the corrected conveying time, and the arrival conveying time. In particular, when the corrected conveying speed is a low speed v3, the control unit 17 calculates the normal conveying period T2, the second acceleration period T3, and the arrival conveying period T6 based on the calculated normal conveying time and the arrival conveying time.

[0092] The control unit 17 can also determine the normal transport time, the corrected transport time, and the arrival transport time based on a lower limit of the normal transport time. The lower limit of the normal transport time is defined as the continuous transport of the medium 99 at the normal transport speed v0 from the start of the normal transport period T2 until after the reference arrival time. The lower limit of the normal transport time can also be a time longer than the time until the transport of the preceding medium 99 carried out by the second transport unit 22 is completed. Thus, the control unit 17 can transport the preceding medium 99 and the subsequent medium 99 at the normal transport speed v0 via the second transport unit 22 until the transport of the preceding medium 99 carried out by the second transport unit 22 is completed.

[0093] In step S16, the control unit 17 performs a corrected transport data setting process. In this process, the control unit 17 generates corrected transport data for enabling the second transport unit 22 to transport the medium 99, based on the corrected transport speed selected in step S14 and the various transport times and periods determined in step S15. The control unit 17 sets the generated corrected transport data in its memory.

[0094] Conveyor control processing Next, the transport control process will be explained. The transport control process is executed by the control unit 17 at the start of transport of medium 99.

[0095] In this process, when the transport of the medium 99 has started, the control unit 17 controls the first transport unit 21 to supply the medium 99 from the medium receiving unit 12. When the transport of the medium 99 has started, the control unit 17 controls the second transport unit 22 based on transport data stored in the memory. When the transport of the medium 99 has started, the control unit 17 begins counting for calculating arrival times.

[0096] The transport data includes normal transport data and modified transport data. Normal transport data is transport data in which the medium 99 is transported without modified transport speed. Normal transport data can also be transport data in which the medium 99 is transported at normal transport speed v0 and then at approach transport speed v3. Normal transport data can also be transport data including a first acceleration period T1, a normal transport period T2, a second acceleration period T3, an approach transport period T6, and a second deceleration period T7.

[0097] When the transport of the medium 99 has started, the control unit 17 controls the second transport unit 22 based on normal transport data. After performing transport data control processing and setting the corrected transport data in the memory, the control unit 17 transports the medium 99 based on the corrected transport data instead of the normal transport data.

[0098] Therefore, for each sheet of medium 99 to be transported on the transport path 15, the control unit 17 sequentially changes the transport speed implemented by the second transport unit 22 to the normal transport speed v0, the modified transport speed, and the contact transport speed v3. In particular, based on the modified transport data, when the modified transport speed is a low speed v3, since the low speed v3 is equal to the contact transport speed v3, the control unit 17 sequentially changes the transport speed implemented by the second transport unit 22 to the normal transport speed v0 and the contact transport speed v3.

[0099] Thus, the control unit 17 controls the second conveying unit 22 to convey the medium 99 at a normal conveying speed v0 during the normal conveying period T2, not during the corrected conveying period T4. The control unit 17 also controls the second conveying unit 22 to convey the medium 99 at a corrected conveying speed during the corrected conveying period T4 based on the corrected conveying time. Finally, the control unit 17 controls the second conveying unit 22 to convey the medium 99 at an approach conveying speed v3 during the contact conveying period T6.

[0100] In particular, when multiple media 99, including the preceding medium 99 and the subsequent medium 99, are conveyed along the conveying path 15, the normal conveying period T2 includes the period during which the rear end of the preceding medium 99 is conveyed by the second conveying unit 22 and the conveying of the subsequent medium 99 begins. Thus, during the normal conveying period T2, the second conveying unit 22 conveys both the preceding medium 99 and the subsequent medium 99.

[0101] During the normal transport period T2, the transport of the preceding medium 99 carried out by the second transport unit 22 is completed. That is, the transport of the preceding medium 99 carried out by the second transport unit 22 is completed before the correction transport period T4. Thus, during the correction transport period T4, after the second transport unit 22 has completed the transport of the preceding medium 99, it transports the subsequent medium 99.

[0102] Therefore, the control unit 17 controls the transport of the preceding medium 99 at a normal transport speed v0 during the period when the second transport unit 22 is transporting the rear end of the preceding medium 99. The control unit 17 also controls the transport of the following medium 99 at a modified transport speed after the transport of the preceding medium 99 by the second transport unit 22 has been completed.

[0103] When the control unit 17 changes the conveying speed of the second conveying unit 22, it controls the second conveying unit 22 by implementing a curved acceleration and deceleration method. That is, the control unit 17 does not implement trapezoidal drive or triangular drive as linear acceleration and deceleration, but implements curved drive as curved acceleration and deceleration. The rate of change of acceleration and deceleration in the curved drive is not constant, but is implemented by changing the rate of change of acceleration and deceleration.

[0104] In this situation, the control unit 17 controls the second conveying unit 22 by reading the acceleration conveying mode from the memory and implementing a curved acceleration. The control unit 17 also controls the second conveying unit 22 by reading the deceleration conveying mode from the memory and implementing a curved deceleration.

[0105] The accelerated conveying mode includes a conveying mode for accelerating the conveying speed implemented by the second conveying unit 22 from 0 to the normal conveying speed v0. The accelerated conveying mode includes a conveying mode for accelerating the conveying speed implemented by the second conveying unit 22 from the normal conveying speed v0 to a reference speed v1. The accelerated conveying mode includes a conveying mode for accelerating the conveying speed implemented by the second conveying unit 22 from the normal conveying speed v0 to a high speed v2. The accelerated conveying mode includes a conveying mode for accelerating the conveying speed implemented by the second conveying unit 22 from the normal conveying speed v0 to a low speed v3.

[0106] The deceleration conveying mode includes a conveying mode for reducing the conveying speed implemented by the second conveying unit 22 from the reference speed v1 to the approach conveying speed v3. The deceleration conveying mode includes a conveying mode for reducing the conveying speed implemented by the second conveying unit 22 from the high speed v2 to the approach conveying speed v3. The deceleration conveying mode includes a conveying mode for reducing the conveying speed implemented by the second conveying unit 22 from the approach conveying speed v3 to 0.

[0107] Thus, by controlling the conveyor by selecting any one of several modified conveying speeds, the number of acceleration / deceleration conveying modes can be reduced. This, in turn, suppresses the increase in memory storage capacity.

[0108] Specific examples of the control content of the second conveyor unit 22 Next, refer to Figures 2 to 5 Here is a specific example of the control content of the second conveying unit 22.

[0109] like Figure 2As shown, when the transport of medium 99 begins at the timing indicated by symbol T10, it becomes the first acceleration period T1, and the transport speed implemented by the second transport unit 22 accelerates from 0 to the normal transport speed v0. In this case, a curved acceleration is implemented. At the timing indicated by symbol T11, it becomes the normal transport period T2, and the transport speed implemented by the second transport unit 22 is maintained at the normal transport speed v0.

[0110] When the leading edge of the medium 99 is detected by the first medium detection unit 41 at the timing indicated by symbol T12, the arrival time from the start of the medium 99's transport becomes the reference arrival time. At this time, the difference becomes 0. Therefore, a reference speed v1 is selected from multiple corrected transport speeds, and then a first time t1 is determined as the corrected transport time. Based on the corrected transport time, the start timing of the second acceleration period T3, the start timing of the corrected transport period T4, and the start timing of the first deceleration period T5 are determined.

[0111] During the second acceleration period T3, indicated by symbol T13, the conveying speed implemented by the second conveying unit 22 accelerates from the normal conveying speed v0 to the reference speed v1. In this case, a curved acceleration is implemented. During the corrective conveying period T4, indicated by symbol T14, the conveying speed implemented by the second conveying unit 22 is maintained at the reference speed v1.

[0112] At the timing indicated by symbol T15, a first time t1 elapses from the timing indicated by symbol T14, which becomes the first deceleration period T5, and the conveying speed implemented by the second conveying unit 22 decelerates from the reference speed v1 to the contact conveying speed v3. In this case, a curved deceleration is implemented. At the timing indicated by symbol T16, the contact conveying period T6 occurs, and the conveying speed implemented by the second conveying unit 22 is maintained at the contact conveying speed v3. Thus, at the fixed timing indicated by symbol T17, the leading edge of the medium 99 is detected by the second medium detection unit 42.

[0113] During the second deceleration period T7, as indicated by symbol T18, the conveying speed implemented by the second conveying unit 22 decreases from the contact conveying speed v3 to 0. In this case, a curved deceleration is performed. At the time indicated by symbol T19, the conveying speed implemented by the second conveying unit 22 becomes 0.

[0114] like Figure 3As shown, after the reference arrival time is established, the leading edge of the medium 99 is sometimes detected by the first medium detection unit 41 at the timing indicated by symbol T22. At this time, the difference becomes the second difference Δt2. The second difference Δt2 is included in the first range. Thus, after selecting the reference speed v1 from multiple corrected transport speeds, the second time t2 is determined as the corrected transport time. The second time t2 is longer than the first time t1.

[0115] During the second acceleration period T3, indicated by symbol T23, the conveying speed implemented by the second conveying unit 22 accelerates from the normal conveying speed v0 to the reference speed v1. In this case, a curved acceleration is implemented. During the correction conveying period T4, indicated by symbol T24, the conveying speed implemented by the second conveying unit 22 is maintained at the reference speed v1.

[0116] At the timing indicated by symbol T15, a second time t2 elapses from the timing indicated by symbol T24, which becomes the first deceleration period T5, and the conveying speed implemented by the second conveying unit 22 decelerates from the reference speed v1 to the approach conveying speed v3. In this case, the leading edge of the medium 99 is also detected by the second medium detection unit 42 at the fixed timing indicated by symbol T17.

[0117] like Figure 4 As shown, after the reference arrival time is established, the leading edge of the medium 99 is sometimes detected by the first medium detection unit 41 at the timing indicated by symbol T32. At this time, the difference becomes the third difference Δt3. The third difference Δt3 is included in the second range. Thus, after selecting the high speed v2 from multiple corrected transport speeds, the third time t3 is determined as the corrected transport time.

[0118] During the second acceleration period T3, indicated by symbol T33, the conveying speed implemented by the second conveying unit 22 accelerates from the normal conveying speed v0 to a high speed v2. In this case, a curved acceleration is implemented. During the corrective conveying period T4, indicated by symbol T34, the conveying speed implemented by the second conveying unit 22 is maintained at the high speed v2.

[0119] At the timing indicated by symbol T35, a third time t3 elapses from the timing indicated by symbol T34, marking the first deceleration period T5. During this period, the conveying speed implemented by the second conveying unit 22 decelerates from the high speed v2 to the contact conveying speed v3. In this case, a curved deceleration is implemented. At the timing indicated by symbol T36, the contact conveying period T6 occurs, and the conveying speed implemented by the second conveying unit 22 is maintained at the contact conveying speed v3. In this case, the leading edge of the medium 99 is also detected by the second medium detection unit 42 at the fixed timing indicated by symbol T17.

[0120] like Figure 5 As shown, before becoming the reference arrival time, the leading edge of the medium 99 is sometimes detected by the first medium detection unit 41 at the timing indicated by symbol T42. At this time, the difference becomes the fourth difference Δt4. The fourth difference Δt4 is included in the third range. Thus, after selecting the low speed v3 from multiple corrective conveying speeds, the fourth time t4 is determined as the total time of the corrective conveying time and the arrival conveying time. The arrival conveying time is the time for conveying the medium 99 at the arrival conveying speed v3.

[0121] During the second acceleration period T3, indicated by symbol T43, the conveying speed implemented by the second conveying unit 22 accelerates from the normal conveying speed v0 to a low speed v3. That is, it accelerates from the normal conveying speed v0 to the contact conveying speed v3. In this case, a curved acceleration is implemented. During the contact conveying period T6, indicated by symbol T44, the conveying speed implemented by the second conveying unit 22 is maintained at the contact conveying speed v3. The contact conveying period T6 includes a correction conveying period T4. In this case, the leading edge of the medium 99 is also detected by the second medium detection unit 42 at the fixed timing indicated by symbol T17.

[0122] The function and effects of the first implementation method The function and effects of the first embodiment will be explained.

[0123] (1-1) The control unit 17 selects the conveying speed of the medium 99 implemented by the second conveying unit 22 from a variety of pre-defined corrected conveying speeds based on the difference between the arrival time of the medium 99 at the predetermined position and the reference arrival time. The control unit 17 calculates the corrected conveying time of the medium 99 at the corrected conveying speed based on the difference and the selected corrected conveying speed. According to this structure, acceleration and deceleration corresponding to the selected corrected conveying speed can be smoothly implemented, and by adjusting the corrected conveying speed, the medium 99 can be conveyed at an appropriate timing. In particular, even if there is a deviation in the conveying time of the medium 99 implemented by the first conveying unit 21, the medium 99 can be conveyed at an appropriate timing, and the feeding timing of the medium 99 implemented by the first conveying unit 21 can have a degree of freedom. Therefore, when correcting the conveying speed, the complexity of the calculation of the corrected conveying speed can be suppressed. Therefore, the conveying performance of the medium 99 can be improved. In this way, by improving the conveying performance of the medium 99, the medium 99 can be recorded at an appropriate timing.

[0124] In addition, the medium 99, which has reached a predetermined position, can be conveyed using a differentially corrected conveying speed. Therefore, the conveying performance of the medium 99 can be improved.

[0125] (1-2) The corrected conveying speed includes a reference speed v1 based on the reference arrival time, a high speed v2 which is faster than the reference speed v1, and a low speed v3 which is slower than the reference speed v1. According to this structure, the corrected conveying speed can be controlled not only as the reference speed v1 based on the reference arrival time, but also as the high speed v2 which is faster than the reference speed v1, and the low speed v3 which is slower than the reference speed v1. Thus, by making the corrected conveying speed diverse, the conveying speed of the medium 99 can be corrected in both cases where the medium 99 arrives at the predetermined position early and cases where the medium 99 arrives at the predetermined position late. Therefore, the conveying performance of the medium 99 can be improved.

[0126] (1-3) During the normal transport period T2, the control unit 17 causes the second transport unit 22 to transport the medium 99 at the normal transport speed v0. During the modified transport period T4, the control unit 17 causes the second transport unit 22 to transport the medium 99 at a modified transport speed. According to this structure, the transport speed implemented by the second transport unit 22 can be different during the modified transport period T4 and the normal transport period T2. Thus, by diversifying the transport speed, the transport speed of the medium 99 can be modified. Therefore, the transport performance of the medium 99 can be improved.

[0127] (1-4) The normal conveying speed v0 is equal to the conveying speed of the medium 99 conveyed through the third conveying unit 23. During the period when the preceding medium 99 is conveyed through the second conveying unit 22, the control unit 17 causes the second conveying unit 22 to convey the preceding medium 99 and the subsequent medium 99 at the normal conveying speed v0. After the conveying of the preceding medium 99 carried out by the second conveying unit 22 is completed, the control unit 17 causes the second conveying unit 22 to convey the subsequent medium 99 at a modified conveying speed. According to this structure, during the period when the preceding medium 99 is conveyed through the second conveying unit 22, the second conveying unit 22 can convey the preceding medium 99 and the subsequent medium 99 at the same normal conveying speed v0 as the third conveying unit 23. As a result, the preceding medium 99 between the second conveying unit 22 and the third conveying unit 23 can be conveyed smoothly. In particular, a structure is adopted in which the recording unit 16 records the medium 99 conveyed through the third conveying unit 23. Therefore, by smoothly conveying the preceding medium 99 between the second conveying unit 22 and the third conveying unit 23, the recording accuracy can be improved. Furthermore, after the preceding medium 99 conveyed by the second conveying unit 22 is completed, the second conveying unit 22 can convey subsequent media 99 at a corrected conveying speed. Thus, subsequent media 99 can be conveyed at a corrected conveying speed via the second conveying unit 22. Therefore, the conveying performance of the medium 99 can be improved.

[0128] (1-5) The normal conveying speed v0 is slower than the corrected conveying speed. According to this structure, after the initial conveying of the medium 99 by the second conveying unit 22 is completed, the second conveying unit 22 can convey subsequent media 99 at a corrected conveying speed that is faster than the normal conveying speed v0. Therefore, the conveying speed of subsequent media 99 can be accelerated by the second conveying unit 22. This increases the throughput of the medium 99. Thus, the conveying performance of the medium 99 can be improved.

[0129] (1-6) The first conveying section 21 is a feeding section for feeding the medium 99 housed in the medium receiving section 12. Normally, the conveying speed v0 is a speed greater than or equal to the conveying speed of the first conveying section 21. According to this structure, the medium 99 can be fed at an appropriate conveying speed, and even if the conveying speed implemented by the first conveying section 21 is slowed down, the conveying speed can be increased by the second conveying section 22. Therefore, the conveying speed of the medium 99 can be increased by the second conveying section 22. Thus, the throughput of the medium 99 can be increased. Therefore, the conveying performance of the medium 99 can be improved. Furthermore, the situation where the medium 99 conveyed by the first conveying section 21 catches up with the medium 99 conveyed by the second conveying section 22 can be suppressed.

[0130] (1-7) The normal conveying speed v0 is slower than the contact conveying speed v3 and the low speed v3. The control unit 17 sequentially changes the conveying speed implemented by the second conveying unit 22 to the normal conveying speed v0, the modified conveying speed, and the contact conveying speed v3. According to this structure, the medium 99 can be contacted with the alignment roller pair 35 at an appropriate conveying speed. In addition, by sequentially changing the conveying speed implemented by the second conveying unit 22 to the normal conveying speed v0, the modified conveying speed, and the contact conveying speed v3, the medium 99 can be conveyed at a conveying speed corresponding to the situation. Therefore, the conveying performance of the medium 99 can be improved.

[0131] (1-8) The reference speed v1 is faster than the conveying speed of the first conveying unit 21. According to this structure, even if the conveying speed implemented by the first conveying unit 21 is slowed down, the conveying speed can be increased by the second conveying unit 22. Therefore, the conveying speed of the medium 99 can be increased by the second conveying unit 22. This increases the throughput of the medium 99. Thus, the conveying performance of the medium 99 can be improved.

[0132] (1-9) The low speed v3 is equal to the contact conveying speed v3. With this structure, the medium 99 can contact the alignment roller pair 35 at an appropriate conveying speed. Furthermore, by setting the modified conveying speed implemented by the second conveying unit 22 to a low speed v3 equal to the contact conveying speed v3, the number of times the conveying speed is changed can be reduced. Therefore, the conveying performance of the medium 99 can be improved.

[0133] (1-10) The control unit 17 controls the second conveying unit 22 by implementing a curved acceleration and deceleration method. According to this structure, the medium 99 can be conveyed by implementing a curved acceleration and deceleration method. Therefore, the conveying performance of the medium 99 can be improved.

[0134] Second Implementation Method Next, the second embodiment will be described. In the following description, for structures that are the same as those in the previously described embodiments, repeated descriptions will be omitted or simplified, and for structures that are different from those in the previously described embodiments, descriptions will be provided.

[0135] like Figure 8 As shown, in the second embodiment, a media transport device 13 may also be used in the recording system 10. The recording system 10 includes a recording device 11, an intermediate device 18, and a post-processing device 19. That is, the recording system 10 includes a media transport device 13.

[0136] The intermediate device 18 is a device for conveying the medium 99, which has been recorded by the recording unit 16, from the recording device 11 to the post-processing device 19. The intermediate device 18 may also flip the medium 99 and convey it to the post-processing device 19.

[0137] The post-processing apparatus 19 is an apparatus for performing post-processing on the medium 99 that has been recorded by the recording unit 16. The post-processing apparatus 19 is equivalent to an example of a post-processing unit. Although the post-processing apparatus 19 can also be controlled by the control unit 17 of the recording device 11, it can also be controlled by the control unit of the post-processing apparatus 19. In such a case, the recording system 10 only needs to have at least one control unit, or it can have a control unit in both the recording device 11 and the post-processing apparatus 19.

[0138] Post-processing can include binding, but in addition to binding, it can also include punching, folding, shifting, and bundling. Binding is the process of binding multiple sheets of media 99 together and then ejecting them. Punching is the process of punching one or more sheets of media 99 and then ejecting them. Folding is the process of folding the media 99 back and then ejecting them. Shifting is the process of adjusting the position of each sheet of media 99 and then ejecting them. Bundling is the process of ejecting multiple sheets of media 99 as a bundle without adjusting their position, and also the process of ejecting a single sheet of media 99 without adjusting its position.

[0139] The function and effects of the second embodiment The function and effects of the second embodiment will be explained.

[0140] (2-1) The recording system 10 includes a post-processing device 19 for post-processing the medium 99 that has been recorded by the recording unit 16. According to this structure, by improving the transport performance of the medium 99, post-processing of the medium 99 can be performed at an appropriate time.

[0141] Third Implementation Method Next, the third embodiment will be described. In the third embodiment, the transport path 15 is longer than that in the first embodiment.

[0142] Structure of recording device 11 like Figure 9As shown, in the third embodiment, the conveying unit 14 may also include a feeding unit 60 and a first conveying unit 51. That is, the recording device 11 and the media conveying device 13 may also include a feeding unit 60 and a first conveying unit 51. The feeding unit 60 is the first conveying unit 21 in the first embodiment and the second embodiment. The feeding unit 60 includes a feeding drive unit 61 and a feeding roller 62. The feeding drive unit 61 is the first conveying drive unit 31 in the first embodiment and the second embodiment. The feeding roller 62 is the feeding roller 30 in the first embodiment and the second embodiment.

[0143] The first conveying unit 51 may also be configured to convey the medium 99 fed from the feeding unit 60 to the second conveying unit 22. The first conveying unit 51 may not be located at the upstream end of the conveying path 15. In this case, the first conveying unit 51 is located downstream of the feeding unit 60 along the conveying path 15.

[0144] The first conveying unit 51 includes a first upstream roller pair 52, a second upstream roller pair 53, and a first conveying drive unit 54. The second upstream roller pair 53 is located downstream of the first upstream roller pair 52. The first conveying drive unit 54 is connected to the first upstream roller pair 52 and the second upstream roller pair 53. The first conveying drive unit 54 is a drive source for rotating the first upstream roller pair 52 and the second upstream roller pair 53. The first conveying drive unit 54 may also be an electric motor.

[0145] The first conveying drive unit 54 is driven based on a drive signal from the control unit 17, thereby rotating the first upstream roller pair 52 and the second upstream roller pair 53. The first conveying drive unit 54 rotates the first upstream roller pair 52 and the second upstream roller pair 53 in a manner that conveys the medium 99 in the conveying direction D.

[0146] The first upstream roller pair 52 may also include a switching unit 55. The second upstream roller pair 53 may also include a switching unit 55. That is, the first conveying unit 51 may also include a switching unit 55. The switching unit 55 may, for example, be a one-way clutch.

[0147] The switching unit 55 allows the first upstream roller pair 52 to rotate in the direction of conveying the medium 99 to the second conveying unit 22. The switching unit 55 also allows the second upstream roller pair 53 to rotate in the direction of conveying the medium 99 to the second conveying unit 22.

[0148] The switching unit 55 can switch between a driving state and a driven state. Specifically, the driving state is a state in which the first upstream roller pair 52 and the second upstream roller pair 53 are rotated by the driving force transmitted from the first conveying drive unit 54. That is, the driving state is a state in which the first upstream roller pair 52 and the second upstream roller pair 53 rotate at a speed controlled by the control unit 17. The driven state is a state in which the rollers are driven by friction with the medium 99 conveyed by the second conveying unit 22 without being driven by the first conveying drive unit 54. That is, the driven state is a state in which the rollers are driven to rotate by the medium 99.

[0149] The first upstream roller pair 52, via the switching section 55, suppresses rotation in the direction opposite to the direction of conveying the medium 99 to the second conveying section 22. The second upstream roller pair 53, via the switching section 55, also suppresses rotation in the direction opposite to the direction of conveying the medium 99 to the second conveying section 22.

[0150] Control contents of the first conveyor unit 51 and the second conveyor unit 22 In the third embodiment, the correction of the conveying speed includes Figure 10 The reference speed v4 shown is Figure 10 The high speed v5 is shown. The reference speed v4 is slower than the normal conveyor speed v0. The reference speed v4 is slower than the contact conveyor speed v3. The high speed v5 is faster than the normal conveyor speed v0. The high speed v5 is faster than the contact conveyor speed v3.

[0151] Next, refer to Figure 10 and Figure 11 Here are specific examples of the control contents of the first conveying unit 51 and the second conveying unit 22. Figure 10 This is a specific example of the control content of the second transport unit 22. Figure 11 This is a specific example of the control content of the first conveying unit 51.

[0152] like Figure 10 As shown, when the conveying of medium 99 by the feed unit 60 and the first conveying unit 51 begins at the timing indicated by symbol T70, the second conveying unit 22 begins conveying medium 99 at the timing indicated by symbol T50. Thereafter, the conveying speed implemented by the second conveying unit 22 is gradually increased, and at the timing indicated by symbol T51, the conveying speed implemented by the second conveying unit 22 is maintained at the normal conveying speed v0.

[0153] When the leading edge of medium 99 is detected by the first medium detection unit 41 at the timing indicated by the symbol T52, which serves as the reference arrival time, the difference between the arrival time and the reference arrival time becomes 0. Therefore, a reference speed v4 is selected from multiple corrected transport speeds, and then a fifth time t5 is determined as the corrected transport time. The timing for starting the adjustment of the transport speed can also be determined based on the corrected transport time.

[0154] At the timing indicated by symbol T53, the conveying speed implemented by the second conveying unit 22 is decelerated in a conveying curve manner, and at the timing indicated by symbol T54, the conveying speed implemented by the second conveying unit 22 is maintained at the reference speed v4.

[0155] At the timing indicated by symbol T55, when a fifth time t5 has elapsed since the timing indicated by symbol T54, the conveying speed implemented by the second conveying unit 22 is accelerated in a curved manner, and maintained at the contact conveying speed v3 at the timing indicated by symbol T56. Thus, the leading edge of the medium 99 is detected by the second medium detection unit 42 at the fixed timing indicated by symbol T57. At the timing indicated by symbol T58, the conveying speed implemented by the second conveying unit 22 is decelerated in a curved manner, and at the timing indicated by symbol T59, the conveying speed implemented by the second conveying unit 22 becomes 0.

[0156] like Figure 11 As shown, when the feeding of medium 99 by the feeding unit 60 begins at the timing indicated by symbol T70, the first conveying unit 51 begins conveying medium 99 at the timing indicated by symbol T71. Thereafter, the conveying speed implemented by the first conveying unit 51 is gradually increased, and then maintained at a normal conveying speed v0 at the timing indicated by symbol T71. The normal conveying speed v0 is an example of a predetermined conveying speed.

[0157] When a reference speed v4 is selected as the corrected conveying speed for the second conveying unit 22, the control unit 17 controls the conveying speed of the first conveying unit 51 in a curved manner at the timing indicated by symbol T72, and maintains the conveying speed of the first conveying unit 51 at the reference speed v4 at the timing indicated by symbol T73. The control unit 17 drives the first conveying unit 51 at the reference speed v4 for a seventh time t7. The seventh time t7 can also be a value used when the first conveying unit 51 is driven at the corrected conveying speed.

[0158] At the timing indicated by symbol T74, when the seventh time t7 has elapsed since the timing indicated by symbol T73, the control unit 17 causes the conveying speed of the first conveying unit 51 to decrease in a curve-like manner, and at the timing indicated by symbol T75, the conveying speed of the first conveying unit 51 is set to 0.

[0159] In this case, the driving force generated by the first conveying drive unit 54 is not transmitted to the first upstream roller pair 52 and the second upstream roller pair 53, thereby the conveying speed of the first conveying unit 51 becomes 0. On the other hand, the first upstream roller pair 52 and the second upstream roller pair 53 themselves become driven and rotate driven by the medium 99 conveyed by the second conveying unit 22. Thus, although the conveying speed of the first conveying unit 51 may sometimes be inconsistent with the rotational speed of the first conveying unit 51 due to the medium 99 conveyed by the second conveying unit 22, it is in principle consistent with the rotational speed of the first conveying unit 51.

[0160] On the other hand, such as Figure 10 As shown, after the reference arrival time is established, when the leading edge of the medium 99 is detected by the first medium detection unit 41 at the timing indicated by symbol T62, the difference between the arrival time and the reference arrival time becomes the fifth difference Δt5. In this case, after selecting the high speed v5 from multiple corrected transport speeds, the sixth time t6 is determined as the corrected transport time. The sixth time t6 can also be longer than the fifth time t5.

[0161] At the timing indicated by symbol T63, the conveying speed implemented by the second conveying unit 22 is accelerated in a curved manner, and at the timing indicated by symbol T64, the conveying speed implemented by the second conveying unit 22 is maintained at a high speed v5.

[0162] At the timing indicated by symbol T65, when the sixth time t6 has elapsed since the timing indicated by symbol T64, the conveying speed implemented by the second conveying unit 22 is decelerated in a curved manner, and is maintained at the contact conveying speed v3 at the timing indicated by symbol T66.

[0163] like Figure 11 As shown, when a high speed v5 is selected as the modified conveying speed of the second conveying unit 22, the control unit 17 causes the first conveying unit 51 to be driven at the normal conveying speed v0 for an eighth time t8 at the timing indicated by symbol T72. The eighth time t8 can also be a value used when the first conveying unit 51 is driven at a predetermined conveying speed.

[0164] At the timing indicated by symbol T74, when the eighth time t8 has elapsed since the timing indicated by symbol T72, the control unit 17 causes the drive speed of the first conveying unit 51 to decrease in a cyclic manner, and at the timing indicated by symbol T75, the drive speed of the first conveying unit 51 is set to 0.

[0165] Thus, after the medium 99 reaches the predetermined position, the control unit 17, while correcting the conveying speed to the reference speed v4, causes the first conveying unit 51 to rotate at the reference speed v4. In other words, the control unit 17, when correcting a conveying speed that is slower than the normal conveying speed v0, causes the first conveying unit 51 to rotate at the reference speed v4.

[0166] After the medium 99 reaches the predetermined position, the control unit 17, with the corrected conveying speed set to a high speed v5, causes the first conveying unit 51 to rotate at the normal conveying speed v0. In other words, when the control unit 17 corrects the conveying speed to a level higher than the normal conveying speed v0, the first conveying unit 51 rotates at the normal conveying speed v0.

[0167] In the third embodiment, Figure 11 The symbol T72 shown indicates the timing and Figure 10 The timing indicated by the symbols T53 and T63 is earlier. Figure 11 The symbol T73 indicates the timing and Figure 10 The timing indicated by symbols T54 and T64 is earlier than that shown, and is also... Figure 10 The timing indicated by symbols T53 and T63 is earlier. Thus, the change in the conveying speed of the first conveying unit 51 is performed before the change in the conveying speed of the second conveying unit 22. In other words, the control unit 17 changes the conveying speed of the second conveying unit 22 after changing the conveying speed of the first conveying unit 51.

[0168] The role and effects of the third implementation method The function and effects of the third embodiment will be explained.

[0169] (3-1) After the medium 99 reaches the predetermined position, the control unit 17, with the conveying speed corrected to a high speed v5, causes the first conveying unit 51 to rotate at a normal conveying speed v0. After the medium 99 reaches the predetermined position, the control unit 17, with the conveying speed corrected to a reference speed v4, causes the first conveying unit 51 to rotate at a reference speed v4.

[0170] According to this structure, when the corrected conveying speed of the second conveying unit 22 is slower than the normal conveying speed v0 in the first conveying unit 51, the control unit 17 can control the conveying speed of the first conveying unit 51 to a reference speed v4, which serves as the corrected conveying speed of the second conveying unit 22. Therefore, the first conveying unit 51 can prevent the rear end of the medium 99 from being conveyed relative to the second conveying unit 22 at a speed faster than the front end of the medium 99. Thus, the first conveying unit 51 can convey the medium 99 to the second conveying unit 22 at an appropriate speed. Therefore, the conveying performance of the medium 99 can be improved.

[0171] (3-2) After changing the conveying speed of the first conveying unit 51, the control unit 17 changes the conveying speed of the second conveying unit 22. According to this structure, the control unit 17 can change the conveying speed of the second conveying unit 22 based on the conveying speed of the first conveying unit 51. Therefore, the first conveying unit 51 can suppress the situation where the rear end of the medium 99 is conveyed to the second conveying unit 22 at a speed faster than the front end of the medium 99. Thus, the conveying performance of the medium 99 can be improved.

[0172] Change Example This embodiment can be implemented by modification as follows. This embodiment and the following modifications can be combined with each other within the scope of technical inconsistency.

[0173] In the second embodiment, the intermediate device 18 may also perform post-processing of the medium 99. The recording device 11 may also perform post-processing of the medium 99. Post-processing may also be a process of flipping and conveying the medium 99. Although post-processing may be a process of flipping and conveying the medium 99, it may also be, for example, a binding process, a perforation process, a folding process, a shifting process, or a bundling and stacking process.

[0174] The control unit 17 can also correct the conveying speed implemented by the second conveying unit 22 when the difference exceeds or falls below the allowable range. The control unit 17 can also select a high speed v2 as the corrected conveying speed implemented by the second conveying unit 22 when the difference exceeds the allowable range. The control unit 17 can also select a reference speed v1 as the corrected conveying speed implemented by the second conveying unit 22 when the difference exceeds the allowable range, and calculate the corrected conveying time. The control unit 17 can also select a low speed v3 as the corrected conveying speed of the second conveying unit 22 when the difference is below the allowable range. The control unit 17 can also select a reference speed v1 as the corrected conveying speed implemented by the second conveying unit 22 when the difference is below the permissible range, and calculate the corrected conveying time. The control unit 17 can also select a reference speed v1 as the corrected conveying speed implemented by the second conveying unit 22 when the difference is within the allowable range, and set the corrected conveying time to a fixed time. The allowable range can also be a first range. The allowable range can also be included in the first range.

[0175] • Control unit 17 may also choose not to use low speed v3 as the corrective conveying speed implemented by second conveying unit 22 when the difference becomes a negative value. In other words, control unit 17 may also choose high speed v2 as the corrective conveying speed implemented by second conveying unit 22 when the difference becomes a positive value.

[0176] • Control unit 17 may also choose not to select high speed v2 as the corrective conveying speed implemented by second conveying unit 22 when the difference becomes a positive value. In other words, control unit 17 may also choose low speed v3 as the corrective conveying speed implemented by second conveying unit 22 when the difference becomes a negative value.

[0177] • The conveying speed of the medium 99 carried by the alignment roller pair 35 may differ from the conveying speed of the medium 99 carried by the medium support portion 37. Generally, the conveying speed v0 may be equal to the conveying speed of the medium 99 carried by the alignment roller pair 35 or the conveying speed of the medium 99 carried by the medium support portion 37.

[0178] • Control unit 17 can also control the third transport unit 23 to temporarily stop the transport of the medium 99 performed by the third transport unit 23 before recording the medium 99. Control unit 17 can also control the third transport unit 23 to continuously transport the medium 99 performed by the third transport unit 23.

[0179] The low speed v3 can be faster than the contact conveyor speed v3. The low speed v3 can also be slower than the contact conveyor speed v3. The low speed v3 can also be faster than the normal conveyor speed v0, and slower than the contact conveyor speed v3. The low speed v3 can also be equal to the normal conveyor speed v0. The contact conveyor speed v3 can also be equal to the normal conveyor speed v0.

[0180] • The modified conveyor speed can also include two or more conveyor speeds. The modified conveyor speed can also include two or more high speeds that are faster than the base speed. The modified conveyor speed can also include two or more low speeds that are slower than the base speed.

[0181] • The control unit 17 can also select different speeds as a correction speed based on the conveying conditions. The conveying conditions may include, for example, the dimensions of the medium 99, such as its length in the conveying direction D. The conveying conditions may also include the type of medium 99, such as plain paper or thick paper. The conveying conditions may also include the position of the medium storage unit 12 of the multiple medium storage units 12. That is, the conveying conditions may also include the distance from the first conveying unit 21 to a predetermined position.

[0182] • The conveying speed v0 can be faster than the conveying speed of the medium 99 carried out by the first conveying unit 21, or it can be equal to the conveying speed of the medium 99 carried out by the first conveying unit 21, or it can be slower than the conveying speed of the medium 99 carried out by the first conveying unit 21.

[0183] · Figure 2 The modified transmission data shown is predefined as the normal transmission data, such as Figures 3 to 5 As shown, the control unit 17 can also generate corrected transport data when the difference is not 0, and control the second transport unit 22 based on the corrected transport data.

[0184] • The control unit 17 can also perform arbitrary processing to determine the corrected conveying time based on the differential and corrected conveying time. For example, if the reference speed v1 is determined as the corrected conveying speed, the control unit 17 can also perform processing based on the differential and corrected conveying time. Figure 2 The corrected conveying time is determined by the first time t1, the difference, and the corrected conveying speed. Specifically, the control unit 17 determines the corrected conveying distance based on the difference. The corrected conveying distance is... Figure 2The conveying data shown indicates the conveying distance required for the front end of medium 99 to reach the detection position at a predetermined second detection time. Control unit 17 calculates the time used to correct to the first time t1 based on the corrected conveying distance and corrected conveying speed. Therefore, control unit 17 can also calculate the corrected conveying time based on the first time t1 and the time used to correct to the first time t1.

[0185] The second conveying drive unit 34 may also include a drive source for rotating the first roller pair 32 and a drive source for rotating the second roller pair 33. The second conveying drive unit 34 may also be a drive source for rotating at least one of the first roller pairs 32. The second conveying drive unit 34 may also be a drive source for rotating at least one of the second roller pairs 33.

[0186] The first conveying unit 21 may include a separating roller pair in addition to the feed roller 30. The second conveying unit 22 may include a third roller pair in addition to the first roller pair 32 and the second roller pair 33. The second conveying unit 22 may also include the first roller pair 32 but not the second roller pair 33.

[0187] • The first conveying unit 21 may not be the feeding unit that conveys the medium 99 from the medium receiving unit 12. The first conveying unit 21 may also be configured to convey the medium 99 conveyed from the feeding unit. That is, the first conveying unit 21 may not be located at the upstream end of the conveying path 15. In this way, although the arrival time is the time when the tip of the medium 99 reaches the predetermined position based on the start of the conveying of the medium 99, it may also be the time when the tip of the medium 99 reaches the predetermined position after passing through the first conveying unit 21.

[0188] • The predetermined position can be downstream of the first conveying section 21, or it can be upstream of the first roller pair 32. The detection position can be a predetermined position downstream of the second conveying section 22, or it can detect the position of the front end of the medium 99 without using the second medium detection section 42.

[0189] The alignment roller pair 35 may also be provided between the second conveying section 22 and the third conveying section 23. In this case, the third conveying section 23 may not have the alignment roller pair 35. That is, the second conveying section 22, the alignment roller pair 35 and the third conveying section 23 may be provided sequentially from upstream to downstream.

[0190] The second media detection unit 42 may not be positioned upstream of the alignment roller pair 35 by a small distance. The media conveying device 13 may also not have the alignment roller pair 35. In this case, the second media detection unit 42 may also be positioned upstream of the third conveying unit 23.

[0191] The third conveying unit 23 may also be located downstream of the recording unit 16. The second conveying unit 22 may also be located downstream of the recording unit 16. The first conveying unit 21 may also be located downstream of the recording unit 16.

[0192] • The conveying unit 14 may also include a fourth conveying unit (not shown). The fourth conveying unit may also be provided between the first conveying unit 21 and the second conveying unit 22. The fourth conveying unit may also be provided between the second conveying unit 22 and the third conveying unit 23.

[0193] In the third embodiment, the first upstream roller pair 52 may have one of the rollers having a switching part 55, or both rollers may have a switching part 55. The second upstream roller pair 53 may have one of the rollers having a switching part 55, or both rollers may have a switching part 55. The first upstream roller pair 52 may also not have a switching part 55. The second upstream roller pair 53 may also not have a switching part 55.

[0194] In the third embodiment, the first roller pair 32 may also include a switching section 55. In the third embodiment, the second roller pair 33 may also include a switching section 55. The first roller pair 32 may have one roller in the pair with the switching section 55, or both rollers may have the switching section 55. The second roller pair 33 may have one roller in the pair with the switching section 55, or both rollers may have the switching section 55.

[0195] In the third embodiment, from Figure 11 The conveying speed implemented by the first conveying unit 51, starting from symbol T72, can also be a speed faster than the normal conveying speed v0. For example, after the medium 99 reaches the predetermined position, the control unit 17 can, if the conveying speed is corrected to a high speed v5, cause the first conveying unit 51 to convey at a speed faster than the normal conveying speed v0 but lower than the high speed v5, if the conveying speed is corrected to a high speed v5, after the medium 99 reaches the predetermined position.

[0196] In the third embodiment, from Figure 11 The conveying speed implemented by the first conveying unit 51, starting from symbol T71, can also be a slower speed compared to the normal conveying speed v0. In other words, the predetermined conveying speed can also be a slower speed compared to the normal conveying speed v0. From Figure 11The conveying speed implemented by the first conveying unit 51, starting from symbol T71, can also be a speed that is faster than the normal conveying speed v0. In other words, the predetermined conveying speed can also be a speed that is faster than the normal conveying speed v0.

[0197] In the third embodiment, the first transport drive unit 54 and the second transport drive unit 34 can be controlled either via the same control board or via different control boards. Even when the first transport drive unit 54 and the second transport drive unit 34 are controlled via different control boards, smooth transport of the medium 99 is possible even if an error due to delay occurs between the control timing of the first transport drive unit 54 and the control timing of the second transport drive unit 34. In the third embodiment, the first transport unit 51 can also be controlled by a different control unit than the second transport unit 22. That is, the recording apparatus 11 and the media transport apparatus 13 can also have multiple control units.

[0198] In the third embodiment, the control unit 17 may also change the conveying speed of the second conveying unit 22 when changing the conveying speed of the first conveying unit 51. Alternatively, the control unit 17 may change the conveying speed of the first conveying unit 51 after changing the conveying speed of the second conveying unit 22.

[0199] In the third embodiment, the recording device 11 may also include two or more media receiving sections 12. A portion of these media receiving sections 12 may be configured to directly convey the media 99 to the second conveying section 22 without passing through the first conveying section 51. In this case, the recording device 11 and the media conveying device 13 may also include a number of feed sections 60 corresponding to the number of media receiving sections 12.

[0200] In the third embodiment, the recording device 11 and the media conveying device 13 may also have two or more first conveying units 51. The recording device 11 and the media conveying device 13 may have two or more first conveying units 51 for one media receiving unit 12, or they may each have one or more first conveying units 51 for two or more media receiving units 12.

[0201] • Medium 99 can also be paper, resin film or sheet, resin and metal composite film, laminated film, fabric, non-woven fabric, metal foil, metal film, ceramic sheet, and clothing, etc.

[0202] • The liquid can be arbitrarily selected as long as it is a substance that can be recorded on the medium 99 by adhering to it. For example, inks also include substances formed by dissolving, dispersing or mixing particles of functional materials such as pigments or metal particles in a solvent, including various compositions such as water-based inks, oil-based inks, gel inks, and hot melt inks.

[0203] • The recording device 11 can also be a landscape printer. A landscape printer is a printer whose carriage can move in both the X and Y axes. The recording device 11 is not limited to an inkjet printer; it can also be a dot-matrix printer. The recording device 11 can also be a laser printer.

[0204] The media transport device 13 can be used in the intermediate device 18 in addition to the recording device 11. The media transport device 13 can also be used in the post-processing device 19. The media transport device 13 can also be used in the image reading device.

[0205] The phrase "at least one" as used in this specification refers to one or more desired options. As an example, "at least one" as used in this specification means, if the number of options is two, either only one option or both options. As another example, "at least one" as used in this specification means, if the number of options is three or more, either only one option or a combination of two or more arbitrary options.

[0206] Postscript The following describes the technical concept and its effects derived from the above-described embodiments and modifications. These technical concepts and their effects can be combined with each other without technical contradiction.

[0207] [1] A medium conveying device includes: a conveying section for conveying a medium; and a control section for controlling the conveying section, the conveying section having a first conveying section for conveying the medium and a second conveying section for conveying the medium downstream of the first conveying section, the control section selecting a medium conveying speed implemented by the second conveying section from a variety of predetermined corrected conveying speeds based on the difference between the arrival time of the medium at a predetermined position downstream of the first conveying section and a reference arrival time, and calculating a corrected conveying time for conveying the medium at the corrected conveying speed based on the difference and the selected corrected conveying speed.

[0208] According to this structure, the conveying speed of the medium implemented by the second conveying unit can be selected from a variety of pre-defined corrected conveying speeds based on the difference between the arrival time of the medium at the predetermined position and the reference arrival time. Then, the corrected conveying time for conveying the medium at the corrected conveying speed can be calculated based on the difference and the corrected conveying speed. Therefore, acceleration and deceleration corresponding to the selected corrected conveying speed can be smoothly implemented, and by adjusting the corrected conveying speed, the medium can be conveyed at an appropriate timing. Thus, the complexity of calculating the corrected conveying speed can be suppressed when correcting the conveying speed. Therefore, the conveying performance of the medium can be improved.

[0209] In addition, it can transport media that have reached a predetermined location at a modified transport speed based on the difference between the arrival time and the reference arrival time. Therefore, the transport performance of the media can be improved.

[0210] [2] In the above-mentioned medium conveying device, the modified conveying speed may also be configured to include a reference speed based on the reference arrival time, a high speed that is faster than the reference speed, and a low speed that is slower than the reference speed.

[0211] According to this structure, the corrected conveying speed can be controlled to be a high speed, which is faster than a reference speed based on a reference arrival time, and a low speed, which is slower than a reference speed based on a reference arrival time. Thus, by diversifying the corrected conveying speed, the conveying speed of the medium can be corrected in both cases where the medium arrives at the predetermined position early and cases where the medium arrives at the predetermined position late. Therefore, the conveying performance of the medium can be improved.

[0212] [3] In the above-described medium conveying device, the control unit may also be configured to convey the medium at the modified conveying speed during the modified conveying period based on the modified conveying time, and to convey the medium at the normal conveying speed during the normal conveying period when the modified conveying period is not the modified conveying period.

[0213] This structure allows for different conveying speeds during the modified conveying period and the normal conveying period. By diversifying the conveying speed, the conveying speed of the medium can be modified, thereby improving the conveying performance of the medium.

[0214] [4] In the above-described medium conveying device, the conveying unit may also be configured such that the conveying unit further includes a third conveying unit, which conveys the medium downstream of the second conveying unit, and the normal conveying speed is equal to the conveying speed of the medium conveyed through the third conveying unit. When the control unit causes the second conveying unit to convey multiple media, including the preceding medium and the following medium, during the period when the preceding medium is conveyed through the second conveying unit to the rear end, the second conveying unit conveys the preceding medium and the following medium at the normal conveying speed, and after the conveying of the preceding medium carried out by the second conveying unit is completed, the second conveying unit conveys the following medium at the corrected conveying speed unit.

[0215] According to this structure, during the period when the preceding medium 99 is conveyed through the second conveying unit, the second conveying unit can convey both the preceding and subsequent media at the same normal conveying speed as the third conveying unit. This allows for smooth conveying of the preceding medium between the second and third conveying units. Furthermore, after the conveying of the preceding medium by the second conveying unit is completed, the second conveying unit can convey the subsequent medium at a modified conveying speed. This allows for the conveying of the subsequent medium at a modified conveying speed via the second conveying unit. Therefore, the conveying performance of the medium can be improved.

[0216] [5] In the above-mentioned medium conveying device, the normal conveying speed may also be slower than the modified conveying speed.

[0217] According to this structure, after the initial medium transported by the second transport unit is completed, the second transport unit can transport subsequent media at a modified transport speed that is faster than the normal transport speed. Therefore, the transport speed of subsequent media can be accelerated by the second transport unit. Consequently, the transport performance of the media can be improved.

[0218] [6] In the above-described medium conveying device, the first conveying unit may be configured as a feeding unit that feeds the medium stored in the medium storage unit, and the normal conveying speed is a speed above the conveying speed of the feeding unit.

[0219] According to this structure, the medium can be fed at an appropriate conveying speed, and even if the conveying speed implemented by the feeding section is slowed down, the conveying speed can be accelerated by the second conveying section. Therefore, the conveying speed of the medium can be increased by the second conveying section. Thus, the conveying performance of the medium can be improved.

[0220] [7] In the above-described medium conveying device, the conveying unit may also be provided with a pair of alignment rollers, which are disposed downstream of the second conveying unit and are contacted by the medium conveyed by the second conveying unit. The normal conveying speed is slower than the contact conveying speed when the second conveying unit contacts the medium on the alignment rollers and the low speed. The control unit sequentially changes the conveying speed implemented by the second conveying unit to the normal conveying speed, the modified conveying speed, and the contact conveying speed.

[0221] This structure allows the medium to come into contact with the alignment rollers at an appropriate conveying speed. Furthermore, by sequentially changing the conveying speed implemented by the second conveying unit to the normal conveying speed, the modified conveying speed, and the contact conveying speed, the medium can be conveyed at a speed appropriate to the situation. Therefore, the conveying performance of the medium can be improved.

[0222] [8] In the above-mentioned medium conveying device, the first conveying unit may be configured as a feeding unit that feeds the medium stored in the medium storage unit, and the reference speed is faster than the conveying speed of the feeding unit.

[0223] According to this structure, even if the conveying speed implemented by the feeding section is slowed down, the conveying speed can be increased by the second conveying section. Therefore, the conveying speed of the medium can be increased by the second conveying section, thereby improving the conveying performance of the medium.

[0224] [9] In the above-described medium conveying device, the conveying section may also be provided with a pair of alignment rollers, which are disposed downstream of the second conveying section and are contacted by the medium conveyed by the second conveying section, wherein the low speed is equal to the contact conveying speed when the second conveying section contacts the medium on the pair of alignment rollers.

[0225] This structure allows the medium to come into contact with the alignment rollers at an appropriate conveying speed. Furthermore, by setting the corrective conveying speed implemented by the second conveying unit to a low speed equal to the contact conveying speed, the number of times the conveying speed needs to be changed can be reduced. Therefore, the conveying performance of the medium can be improved.

[0226]

[10] In the above-mentioned medium conveying device, the control unit may also control the second conveying unit by implementing a curved acceleration and deceleration method.

[0227] This structure allows for the transport of media using a curved acceleration and deceleration method. Therefore, the transport performance of the media can be improved.

[0228]

[11] In the above-described medium conveying device, the conveying section may also be provided with a pair of alignment rollers, which are disposed downstream of the second conveying section and are contacted by the medium conveyed by the second conveying section. The first conveying section is a feeding section that feeds the medium stored in the medium storage section.

[0229] This structure allows for the feeding of the medium at an appropriate conveying speed, and enables the medium to contact the aligning rollers at the appropriate conveying speed. Therefore, the conveying performance of the medium can be improved.

[0230]

[12] In the above-described medium conveying device, the first conveying unit may be configured to have a switching unit that can switch between a drive state in which the medium rotates at a speed controlled by the control unit and a driven state in which the medium rotates. After the medium reaches the predetermined position, the control unit causes the first conveying unit to rotate at the predetermined conveying speed if the corrected conveying speed is higher than the predetermined conveying speed, and causes the first conveying unit to rotate at the corrected conveying speed if the corrected conveying speed is slower than the predetermined conveying speed.

[0231] According to this structure, when the corrected conveying speed of the second conveying unit is slower than the conveying speed of the first conveying unit, the control unit can control the conveying speed of the first conveying unit to be the corrected conveying speed of the second conveying unit. Therefore, the first conveying unit can convey the medium to the second conveying unit at an appropriate speed. Thus, the conveying performance of the medium can be improved.

[0232]

[13] In the above-described medium conveying device, the first conveying unit may also be configured such that it has a switching unit capable of switching between a drive state in which it rotates at a speed controlled by the control unit and a driven state in which it rotates following the medium. After the medium reaches the predetermined position, the control unit causes the first conveying unit to rotate at a predetermined conveying speed if the corrected conveying speed is higher than the normal conveying speed, and causes the first conveying unit to rotate at the corrected conveying speed if the corrected conveying speed is slower than the normal conveying speed. According to this configuration, the same effect as in

[12] can be achieved.

[0233]

[14] In the above-described medium conveying device, the control unit may also change the conveying speed of the second conveying unit after changing the conveying speed of the first conveying unit. According to this structure, the control unit can change the conveying speed of the second conveying unit based on the conveying speed of the first conveying unit. Therefore, the conveying performance of the medium can be improved.

[0234]

[15] The recording device includes: a conveying unit for conveying a medium; a recording unit for recording the medium conveyed by the conveying unit; and a control unit for controlling the conveying unit and the recording unit. The conveying unit has a first conveying unit for conveying the medium and a second conveying unit for conveying the medium downstream of the first conveying unit. The control unit selects a conveying speed of the medium implemented by the second conveying unit from a variety of predetermined corrected conveying speeds based on the difference between the arrival time of the medium at a predetermined position downstream of the first conveying unit and a reference arrival time. The control unit calculates a corrected conveying time for conveying the medium at the corrected conveying speed based on the difference and the selected corrected conveying speed.

[0235] According to this structure, the same effect as [1] can be achieved. In addition, by improving the transport performance of the medium, it is possible to record the medium at appropriate timing.

[0236]

[16] In the above-described recording apparatus, the conveying unit may also be configured such that the conveying unit further comprises a third conveying unit, which conveys the medium downstream of the second conveying unit, and the recording unit performs recording on the medium conveyed by the third conveying unit. According to this structure, the same effect as in

[15] can be achieved.

[0237]

[17] The recording system includes: a conveying unit for conveying a medium; a recording unit for recording the medium conveyed by the conveying unit; a post-processing unit for post-processing the medium recorded by the recording unit; and a control unit for controlling the conveying unit, the recording unit, and the post-processing unit. The conveying unit has a first conveying unit for conveying the medium and a second conveying unit for conveying the medium downstream of the first conveying unit. The control unit selects a conveying speed of the medium implemented by the second conveying unit from a variety of predefined corrected conveying speeds based on the difference between the arrival time of the medium at a predetermined position downstream of the first conveying unit and a reference arrival time. The control unit calculates a corrected conveying time for conveying the medium at the corrected conveying speed based on the difference and the selected corrected conveying speed.

[0238] According to this structure, the same effect as [1] can be achieved. In addition, by improving the transport performance of the medium, it is possible to record after the medium is applied at an appropriate time.

[0239]

[18] In a control method for a media conveying device, the media conveying device includes a first conveying section for conveying media and a second conveying section for conveying media downstream of the first conveying section. The control method for the media conveying device includes the following process: selecting a media conveying speed implemented by the second conveying section from a variety of pre-defined corrected conveying speeds based on the difference between the arrival time of the media at a predetermined position downstream of the first conveying section and a reference arrival time; and calculating a corrected conveying time for conveying the media at the corrected conveying speed based on the difference and the selected corrected conveying speed. According to this structure, the same effect as [1] can be achieved.

[0240] Symbol Explanation 10…Recording system; 11…Recording device; 12…Media receiving unit; 13…Media conveying device; 14…Conveying unit; 15…Conveying path; 16…Recording unit; 17…Control unit; 18…Intermediate device; 19…Post-processing device; 21…First conveying unit; 22…Second conveying unit; 23…Third conveying unit; 24…Discharge conveying unit; 30…Feeding roller; 31…First conveying drive unit; 32…First roller pair; 33…Second roller pair; 34…Second conveying drive unit; 35…Alignment roller pair; 36…Third conveying drive unit; 37…Media support unit; 38…Conveyor belt; 39…Pulley; 40…Discharge roller pair; 41…First media detection unit; 42…Second media detection unit; 51…First conveying unit; 52…First upstream roller pair; 53…Second upstream roller pair; 54…First conveying drive unit Section; 55… Switching section; 60… Feeding section; 61… Feeding drive section; 62… Feeding roller; 99… Medium; D… Conveying direction; t1… First time; t2… Second time; t3… Third time; t4… Fourth time; t5… Fifth time; t6… Sixth time; t7… Seventh time; t8… Eighth time; T1… First acceleration period; T2… Normal conveying period; T3… Second acceleration period; T4… Correction conveying period; T5… First deceleration period; T6… Contact conveying period; T7… Second deceleration period; Δt2… Second differential; Δt3… Third differential; Δt4… Fourth differential; Δt5… Fifth differential; v0… Normal conveying speed; v1… Reference speed; v2… High speed; v3… Low speed; v3… Contact conveying speed; v4… Reference speed; v5… High speed.

Claims

1. A medium conveying device, characterized in that, have: The conveying unit is responsible for transporting the medium. The control unit controls the conveying unit. The conveying unit includes a first conveying unit for conveying the medium, and a second conveying unit for conveying the medium downstream of the first conveying unit. The control unit selects the medium conveying speed implemented by the second conveying unit from a variety of pre-defined corrected conveying speeds based on the difference between the arrival time of the medium at a predetermined position downstream of the first conveying unit and the reference arrival time, and calculates the corrected conveying time for conveying the medium at the corrected conveying speed based on the difference and the selected corrected conveying speed.

2. The medium conveying device as described in claim 1, characterized in that, The modified conveying speed includes a base speed based on the base arrival time, a high speed that is faster than the base speed, and a low speed that is slower than the base speed.

3. The medium conveying device as described in claim 2, characterized in that, The control unit causes the second conveying unit to convey the medium at the corrected conveying speed during a corrected conveying period based on the corrected conveying time, and causes the second conveying unit to convey the medium at the normal conveying speed during a normal conveying period other than the corrected conveying period.

4. The medium conveying device as described in claim 3, characterized in that, The conveying unit further includes a third conveying unit, which conveys the medium downstream of the second conveying unit. The normal conveying speed is equal to the conveying speed of the medium conveyed through the third conveying section. When the control unit causes the second conveying unit to convey multiple media, including a preceding medium and a subsequent medium, during the period when the preceding medium is conveyed through the second conveying unit to the rear end, the second conveying unit conveys the preceding medium and the subsequent medium at the normal conveying speed, and after the conveying of the preceding medium by the second conveying unit is completed, the second conveying unit conveys the subsequent medium at the modified conveying speed.

5. The medium conveying device as described in claim 4, characterized in that, The normal conveying speed is slower compared to the modified conveying speed.

6. The medium conveying device according to any one of claims 3 to 5, characterized in that, The first conveying unit is a feeding unit that feeds the medium stored in the medium receiving unit. The normal conveying speed is a speed that is higher than or equal to the conveying speed of the feeder.

7. The medium conveying device according to any one of claims 3 to 5, characterized in that, The conveying section also includes a pair of alignment rollers, which are positioned downstream of the second conveying section and are abutted by the medium conveyed by the second conveying section. The normal conveying speed is slower compared to the contact conveying speed when the second conveying section abuts the medium against the alignment rollers and the low speed. The control unit sequentially changes the conveying speed implemented by the second conveying unit to the normal conveying speed, the modified conveying speed, and the contact conveying speed.

8. The medium conveying device according to any one of claims 2 to 5, characterized in that, The first conveying unit is a feeding unit that feeds the medium stored in the medium receiving unit. The reference speed is faster than the conveying speed of the feed unit.

9. The medium conveying device according to any one of claims 2 to 5, characterized in that, The conveying section also includes a pair of alignment rollers, which are positioned downstream of the second conveying section and are abutted by the medium conveyed by the second conveying section. The low speed is equal to the contact conveying speed when the second conveying section contacts the medium against the alignment rollers.

10. The medium conveying device according to any one of claims 1 to 5, characterized in that, The control unit controls the second conveying unit by implementing a curved acceleration and deceleration method.

11. The medium conveying device according to any one of claims 1 to 5, characterized in that, The conveying section also includes a pair of alignment rollers, which are positioned downstream of the second conveying section and are abutted by the medium conveyed by the second conveying section. The first conveying unit is a feeding unit that feeds the medium stored in the medium storage unit.

12. The medium conveying device according to any one of claims 1 to 5, characterized in that, The first conveying unit has a switching unit that can switch between a driving state, in which the conveying unit rotates at a speed controlled by the control unit, and a driven state, in which the conveying unit rotates following the medium. After the medium reaches the predetermined position, the control unit rotates the first conveying unit at the predetermined conveying speed if the corrected conveying speed is above the predetermined conveying speed, and rotates the first conveying unit at the corrected conveying speed if the corrected conveying speed is slower than the predetermined conveying speed.

13. The medium conveying device according to any one of claims 3 to 5, characterized in that, The first conveying unit has a switching unit that can switch between a driving state, in which the conveying unit rotates at a speed controlled by the control unit, and a driven state, in which the conveying unit rotates following the medium. After the medium reaches the predetermined position, the control unit rotates the first conveying unit at a predetermined conveying speed if the corrected conveying speed is higher than the normal conveying speed, and rotates the first conveying unit at the corrected conveying speed if the corrected conveying speed is slower than the normal conveying speed.

14. The medium conveying device as described in claim 12, characterized in that, After changing the conveying speed of the first conveying unit, the control unit changes the conveying speed of the second conveying unit.

15. A recording device, characterized in that, have: The conveying unit is responsible for transporting the medium. A recording unit that records the medium being transported through the conveying unit; The control unit controls the conveying unit and the recording unit. The conveying unit includes a first conveying unit for conveying the medium, and a second conveying unit for conveying the medium downstream of the first conveying unit. The control unit selects the medium conveying speed implemented by the second conveying unit from a variety of pre-defined corrected conveying speeds based on the difference between the arrival time of the medium at a predetermined position downstream of the first conveying unit and the reference arrival time, and calculates the corrected conveying time for conveying the medium at the corrected conveying speed based on the difference and the selected corrected conveying speed.

16. The recording apparatus as claimed in claim 15, characterized in that, The conveying unit further includes a third conveying unit, which conveys the medium downstream of the second conveying unit. The recording unit performs recording on the medium being transported through the third transport unit.

17. A recording system, characterized in that, have: The conveying unit is responsible for transporting the medium. A recording unit that records the medium being transported through the conveying unit; The post-processing unit performs post-processing on the medium that has been recorded by the recording unit; The control unit controls the conveying unit, the recording unit, and the post-processing unit. The conveying unit includes a first conveying unit for conveying the medium, and a second conveying unit for conveying the medium downstream of the first conveying unit. The control unit selects the medium conveying speed implemented by the second conveying unit from a variety of pre-defined corrected conveying speeds based on the difference between the arrival time of the medium at a predetermined position downstream of the first conveying unit and the reference arrival time, and calculates the corrected conveying time for conveying the medium at the corrected conveying speed based on the difference and the selected corrected conveying speed.

18. A control method for a medium conveying device, characterized in that, The medium conveying device includes a first conveying section for conveying the medium and a second conveying section for conveying the medium downstream of the first conveying section. The control method for the medium conveying device includes the following processing: Based on the difference between the arrival time of the medium at a predetermined downstream position compared to the first conveying unit and the reference arrival time, the conveying speed of the medium implemented by the second conveying unit is selected from a variety of pre-defined modified conveying speeds. and Based on the difference and the selected corrected conveying speed, the corrected conveying time for conveying the medium at the corrected conveying speed is calculated.

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