WO2023188389A1 - Dispositif d'éjection de support, procédé de commande, et programme de commande - Google Patents

Dispositif d'éjection de support, procédé de commande, et programme de commande Download PDF

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Publication number
WO2023188389A1
WO2023188389A1 PCT/JP2022/016875 JP2022016875W WO2023188389A1 WO 2023188389 A1 WO2023188389 A1 WO 2023188389A1 JP 2022016875 W JP2022016875 W JP 2022016875W WO 2023188389 A1 WO2023188389 A1 WO 2023188389A1
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WO
WIPO (PCT)
Prior art keywords
medium
ejection
sensor
control unit
roller
Prior art date
Application number
PCT/JP2022/016875
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English (en)
Japanese (ja)
Inventor
修一 森川
喜一郎 下坂
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株式会社Pfu
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Publication date
Application filed by 株式会社Pfu filed Critical 株式会社Pfu
Priority to PCT/JP2022/016875 priority Critical patent/WO2023188389A1/fr
Publication of WO2023188389A1 publication Critical patent/WO2023188389A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H29/00—Delivering or advancing articles from machines; Advancing articles to or into piles
    • B65H29/20—Delivering or advancing articles from machines; Advancing articles to or into piles by contact with rotating friction members, e.g. rollers, brushes, or cylinders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H7/00—Controlling article feeding, separating, pile-advancing, or associated apparatus, to take account of incorrect feeding, absence of articles, or presence of faulty articles
    • B65H7/02—Controlling article feeding, separating, pile-advancing, or associated apparatus, to take account of incorrect feeding, absence of articles, or presence of faulty articles by feelers or detectors
    • B65H7/06—Controlling article feeding, separating, pile-advancing, or associated apparatus, to take account of incorrect feeding, absence of articles, or presence of faulty articles by feelers or detectors responsive to presence of faulty articles or incorrect separation or feed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H9/00—Registering, e.g. orientating, articles; Devices therefor

Definitions

  • the present disclosure relates to a medium ejection device, a control method, and a control program.
  • a media ejecting device such as a scanner sequentially conveys a plurality of media, images them, and ejects them onto an ejection table.
  • a media ejecting device when a skew of the media occurs, the media ejected to the ejecting stand are not aligned, and the user has to align the media.
  • a load is applied to the media, which may cause damage to the media.
  • An image reading means for reading the image of the sheet being fed, an ejected sheet loading means for placing the sheet, and a plurality of individually controllable ejectors located upstream of the ejected sheet placing means.
  • An image reading device having a paper roller is disclosed (see Patent Document 1). This image reading device detects the amount of skew of the sheet, and moves a plurality of paper ejection rollers at different speeds to correct the amount of skew of the sheet based on the detected amount of skew. Rotate with .
  • a sheet skew correction conveyance device includes a skew detection sensor and a side edge detection sensor that detect skew of a sheet to be conveyed, and a skew roller that can correct the skew of a sheet while conveying the sheet. It has been disclosed (see Patent Document 2).
  • This sheet skew correction conveyance device causes the skew roller to correct the skew based on the skew detected by the skew detection sensor, and then causes the skew roller to perform the skew correction based on the skew detected by the side edge detection sensor. Take corrective action.
  • a media discharge device is required to discharge the medium well.
  • the purpose of the medium ejecting device, control method, and control program according to the embodiment is to enable the medium to be ejected well.
  • a medium ejection device includes: an imaging section; a plurality of ejection rollers disposed at intervals in a direction perpendicular to the medium ejection direction downstream of the imaging section in a medium ejection direction; and an imaging section.
  • a plurality of detection sensors are arranged at intervals in a direction perpendicular to the medium ejection direction between the plurality of ejection rollers and a plurality of ejection rollers, and the peripheral speeds of the plurality of ejection rollers are made different from each other.
  • control unit that performs skew correction of the medium by conveying the medium, and the control unit is configured to perform skew correction of the medium by conveying the medium after the rear end of the medium passes one of the plurality of detection sensors; If the elapsed time until passing the detection sensor is less than or equal to the first threshold, skew correction is performed, and if the elapsed time is greater than the first threshold, skew correction is not performed.
  • a control method is a method for controlling a medium ejecting device, in which a plurality of The method includes performing skew correction of the medium by conveying the medium imaged by the imaging unit while changing the circumferential speed of the ejection roller of the image pickup unit. From the time it passes one detection sensor to the time it passes the other detection sensor among the plurality of detection sensors arranged at intervals in the direction orthogonal to the media ejection direction between the unit and the plurality of ejection rollers. If the elapsed time is less than or equal to the first threshold, skew correction is performed, and if the elapsed time is greater than the first threshold, skew correction is not performed.
  • control program includes: an imaging section; a plurality of ejection rollers disposed downstream of the imaging section in the medium ejection direction at intervals in a direction perpendicular to the medium ejection direction; A control program for a medium ejection device having a plurality of detection sensors arranged at intervals in a direction perpendicular to a medium ejection direction between a plurality of ejection rollers and a plurality of ejection rollers, the control program
  • the medium discharging device is caused to perform skew correction of the medium by conveying the medium imaged by the imaging unit with different values from each other, and in performing the skew correction, the rear end of the medium is and the plurality of ejection rollers, from the time when it passes through one of the plurality of detection sensors arranged at intervals in the direction perpendicular to the medium ejection direction until it passes through the other detection sensor. If the elapsed time is less than or equal to the first threshold, skew correction is performed
  • the medium ejecting device, the control method, and the control program can eject the medium favorably.
  • FIG. 1 is a perspective view showing a medium ejecting device 100 according to an embodiment.
  • FIG. 2 is a diagram for explaining a conveyance path inside the medium ejecting device 100.
  • FIG. FIG. 3 is a schematic diagram for explaining the arrangement position of each medium sensor.
  • 1 is a block diagram showing a schematic configuration of a medium ejecting device 100.
  • FIG. 2 is a diagram showing a schematic configuration of a storage device 140 and a processing circuit 150.
  • FIG. 3 is a flowchart illustrating an example of the operation of a medium reading process.
  • 3 is a flowchart illustrating an example of the operation of a medium reading process.
  • FIG. 3 is a schematic diagram showing an example of a partial image N.
  • FIG. 1 is a perspective view showing a medium ejecting device 100 according to an embodiment.
  • FIG. 2 is a diagram for explaining a conveyance path inside the medium ejecting device 100.
  • FIG. FIG. 3 is a schematic diagram for
  • FIG. 7 is a flowchart illustrating a part of the operation of another medium reading process.
  • 7 is a flowchart illustrating a part of the operation of another medium reading process.
  • FIG. 3 is a schematic diagram for explaining skew correction of a medium.
  • 7 is a flowchart illustrating a part of the operation of another medium reading process.
  • FIG. 3 is a schematic diagram for explaining another medium ejecting device 200.
  • FIG. 7 is a flowchart showing another example of the operation of the medium reading process.
  • 3 is a flowchart illustrating an example of the operation of detection processing.
  • FIG. 3 is a schematic diagram for explaining the state of a medium to be discharged.
  • FIG. 3 is a schematic diagram for explaining the state of a medium to be discharged.
  • FIG. 3 is a schematic diagram for explaining the state of a medium to be discharged. 3 is a diagram showing a schematic configuration of another processing circuit 350.
  • FIG. 1 is a perspective view showing a medium ejection device 100 configured as an image scanner.
  • the medium ejecting device 100 conveys a medium, which is a document, images it, and ejects it.
  • the medium is paper, cardboard, card, booklet, passport, etc.
  • the medium ejecting device 100 may be a facsimile, a copying machine, a multifunction peripheral (MFP), or the like.
  • arrow A1 indicates the medium discharge direction
  • arrow A2 indicates the width direction perpendicular to the medium discharge direction
  • arrow A3 indicates the height direction perpendicular to the medium transport path.
  • upstream refers to the upstream side in the medium discharge direction A1
  • downstream refers to the downstream side in the medium discharge direction A1.
  • the medium ejecting device 100 includes a lower housing 101, an upper housing 102, a mounting table 103, an ejecting table 104, an operating device 105, a display device 106, and the like.
  • the upper casing 102 is disposed at a position covering the upper surface of the medium ejecting device 100, and is engaged with the lower casing 101 by a hinge so that it can be opened and closed when a medium becomes clogged or when cleaning the inside of the medium ejecting device 100. There is.
  • the mounting table 103 engages with the lower casing 101 and places the medium to be fed and transported.
  • the ejection table 104 engages with the upper housing 102 and places the ejected medium thereon. Note that the ejection table 104 may be engaged with the lower housing 101.
  • the operating device 105 includes an input device such as a button and an interface circuit that obtains a signal from the input device, receives an input operation by a user, and outputs an operation signal according to the input operation by the user.
  • the display device 106 has a display including a liquid crystal, an organic EL (Electro-Luminescence), etc., and an interface circuit that outputs image data to the display, and displays the image data on the display.
  • FIG. 2 is a diagram for explaining the transport path inside the medium ejecting device 100.
  • the conveyance path inside the medium discharge device 100 includes a first medium sensor 111, a feeding roller 112, a separating roller 113, a second medium sensor 114, a third medium sensor 115, a fourth medium sensor 116, a first conveying roller 117, and a first medium sensor 114. It has two conveyance rollers 118, an imaging device 119, a fifth medium sensor 120, a first discharge roller 121, a second discharge roller 122, and the like.
  • each of the feeding roller 112, separation roller 113, first conveyance roller 117, second conveyance roller 118, first discharge roller 121 and/or second discharge roller 122 is not limited to one, and may be plural. good.
  • the plurality of feed rollers 112, separation rollers 113, first conveyance rollers 117, second conveyance rollers 118, first discharge rollers 121 and/or second discharge rollers 122 each have a width perpendicular to the medium discharge direction A1. They are arranged side by side at intervals in direction A2.
  • the upper surface of the lower casing 101 forms a lower guide 107a for the medium transport path
  • the lower surface of the upper casing 102 forms an upper guide 107b for the medium transport path.
  • the medium conveyance path differs between the surface of the medium and the medium before conveyance, when the medium is placed on the loading table 103, and after the medium is discharged, when the medium is placed on the discharge table 104. It has a so-called straight path mechanism in which the vertical positional relationship of the back surface does not change. Since the medium conveyance path has a straight path mechanism, the medium discharge device 100 is formed compactly.
  • the first medium sensor 111 is arranged upstream of the feeding roller 112 and separation roller 113.
  • the first medium sensor 111 includes a contact detection sensor and detects whether a medium is placed on the mounting table 103.
  • the first medium sensor 111 generates and outputs a first medium signal whose signal value changes depending on whether a medium is placed on the mounting table 103 or not.
  • the first medium sensor 111 is not limited to a contact detection sensor, and any other sensor capable of detecting the presence or absence of a medium, such as a photodetection sensor, may be used as the first medium sensor 111.
  • the feeding roller 112 is provided in the lower housing 101 and sequentially feeds the medium placed on the mounting table 103 from the bottom.
  • Separation roller 113 is provided in upper housing 102 and is disposed opposite to feeding roller 112 . Note that the feeding roller 112 is provided in the upper housing 102 and the separation roller 113 is provided in the lower housing 101. good.
  • the first conveyance roller 117 and the second conveyance roller 118 are arranged downstream of the feeding roller 112 and facing each other.
  • the first conveyance roller 117 and the second conveyance roller 118 convey the medium fed by the feed roller 112 and the separation roller 113 to the imaging device 119.
  • the imaging device 119 is an example of an imaging section, and includes a first imaging device 119a and a second imaging device 119b that are arranged to face each other across a medium transport path.
  • the first imaging device 119a has a first imaging sensor 119c that is an equal-magnification optical system type CIS (Contact Image Sensor) that has CMOS (Complementary Metal Oxide Semiconductor) imaging elements arranged linearly in the main scanning direction.
  • the first imaging sensor 119c images the surface of the medium at the first imaging position P1.
  • the first imaging position P1 is an example of a first position
  • the surface of the medium is an example of a first surface.
  • the first imaging device 119a also includes a lens that forms an image on the imaging device, and an A/D converter that amplifies the electrical signal output from the imaging device and performs analog/digital (A/D) conversion.
  • the first imaging device 119a images the area facing the first imaging sensor 119c on the surface of the medium being conveyed at regular intervals, sequentially generates input images, and outputs the input images. That is, the number of pixels in the vertical direction (sub-scanning direction) of the input image is one, and the number of pixels in the horizontal direction (main-scanning direction) is plural.
  • the second imaging device 119b has a second imaging sensor 119d that is a CIS of the same magnification optical system type and has CMOS imaging elements arranged linearly in the main scanning direction.
  • the second imaging sensor 119d images the back surface of the medium at a second imaging position P2 downstream from the first imaging position P1 in the medium ejection direction A1.
  • the second imaging position P2 is an example of a second position
  • the back surface of the medium is an example of a second surface.
  • the second imaging position P2 downstream of the first imaging position P1 is an example of an imaging position by the imaging device 119.
  • the second imaging device 119b includes a lens that forms an image on the imaging device, and an A/D converter that amplifies the electrical signal output from the imaging device and performs analog/digital (A/D) conversion.
  • the second imaging device 119b images the area facing the second imaging sensor 119d on the surface of the medium being conveyed at regular intervals, sequentially generates input images, and outputs the input images.
  • the medium ejecting device 100 may have only one of the first imaging device 119a and the second imaging device 119b arranged to read only one side of the medium.
  • a line sensor based on a CIS of an equal-magnification optical system type including an image sensor based on a CCD (Charge Coupled Device) may be used as the first image sensor 119c and/or the second image sensor 119d.
  • a reduction optical system type line sensor including a CMOS or CCD image sensor may be used as the first image sensor 119c and/or the second image sensor 119d.
  • the second imaging sensor 119d images the back side of the medium at the first imaging position P1
  • the first imaging sensor 119c images the front side of the medium at a second imaging position P2 downstream from the first imaging position P1.
  • the first image sensor 119c and the second image sensor 119d may be arranged like this.
  • the back surface of the medium is an example of the first surface
  • the front surface of the medium is an example of the second surface.
  • the first discharge roller 121 and the second discharge roller 122 are arranged facing each other downstream from the imaging device 119 in the medium discharge direction A1.
  • the first discharge roller 121 and the second discharge roller 122 discharge the medium conveyed by the first conveyance roller 117 and the second conveyance roller 118 and imaged by the imaging device 119 onto the discharge table 104 .
  • the first discharge roller 121 and/or the second discharge roller 122 are examples of discharge rollers.
  • the first discharge roller 121 and/or the second discharge roller 122 may be collectively referred to as a discharge roller.
  • the medium placed on the mounting table 103 is moved between the lower guide 107a and the upper guide 107b in the medium ejection direction A1 by the feeding roller 112 rotating in the direction of arrow A4 in FIG. 2, that is, in the medium feeding direction. transported towards.
  • the separation roller 113 rotates in the direction of arrow A5, that is, in the opposite direction to the medium feeding direction, when conveying the medium. Due to the action of the feeding roller 112 and separation roller 113, when a plurality of media are placed on the mounting table 103, only the medium that is in contact with the feeding roller 112 among the media placed on the mounting table 103 is removed. are separated. This restricts the conveyance of media other than the separated media (prevention of double feeding).
  • the medium is fed between the first conveyance roller 117 and the second conveyance roller 118 while being guided by the lower guide 107a and the upper guide 107b.
  • the medium is fed between the first imaging device 119a and the second imaging device 119b by rotation of the first transport roller 117 and the second transport roller 118 in the directions of arrows A6 and A7, respectively.
  • the medium read by the imaging device 119 is ejected onto the ejection table 104 by rotating the first ejection roller 121 and the second ejection roller 122 in the directions of arrows A8 and A9, respectively.
  • the discharge table 104 loads the medium discharged by the first discharge roller 121 and the second discharge roller 122.
  • FIG. 3 is a schematic diagram for explaining the arrangement positions of each roller and each medium sensor.
  • FIG. 3 is a schematic diagram of the lower casing 101 in an open state viewed from the conveyance path side.
  • two feed rollers 112, two separation rollers 113, two first conveyance rollers 117, two second conveyance rollers 118, two first discharge rollers 121, and two second discharge rollers 122 are arranged.
  • the second medium sensor 114 and the third medium sensor 115 are examples of a plurality of second sensors.
  • the second medium sensor 114 and the third medium sensor 115 are located downstream of the feeding roller 112 and separation roller 113 in the medium discharge direction A1 and upstream of the imaging device 119, and in the width direction A2 perpendicular to the medium discharge direction. They are placed side by side with space between them.
  • the second medium sensor 114 and the third medium sensor 115 are configured such that the distance W in the width direction A2 between the second medium sensor 114 and the third medium sensor 115 is less than the minimum width of the medium supported by the medium discharge device 100. will be placed in In the example shown in FIG.
  • the second medium sensor 114 and the third medium sensor 115 are arranged upstream of the first conveyance roller 117 and the second conveyance roller 118. Note that the second medium sensor 114 and the third medium sensor 115 may be arranged downstream of the first conveyance roller 117 and the second conveyance roller 118. The second medium sensor 114 and the third medium sensor 115 detect the leading and trailing ends of the medium conveyed to the positions.
  • the second medium sensor 114 includes a light emitter and a light receiver provided on one side with respect to the medium transport path, and a light guide member provided at a position facing the light emitter and the light receiver across the medium transport path.
  • the light guide member is a light guide tube such as a U-shaped prism.
  • the light emitting device is an LED (Light Emitting Diode) or the like, and emits light toward the conveyance path.
  • the light receiver is a photodiode or the like, and receives the light emitted by the light emitter and guided by the light guide member.
  • the light receiver When a medium exists at a position facing the second medium sensor 114, the light emitted from the light emitter is blocked by the medium, so the light receiver does not detect the light emitted from the light emitter.
  • the light receiver generates and outputs a second medium signal whose signal value changes depending on whether the medium is present at the position of the second medium sensor 114 or not, based on the intensity of the light it receives.
  • the second medium signal is an example of an output signal from the second medium sensor 114.
  • the third medium sensor 115 includes a light emitter and a light receiver provided on one side of the medium transport path, and a third medium sensor 115 provided at a position facing the light emitter and light receiver across the medium transport path.
  • a light guide member is included.
  • the light guide member is a light guide tube such as a U-shaped prism.
  • the light emitter is an LED or the like, and emits light toward the conveyance path.
  • the light receiver is a photodiode or the like, and receives the light emitted by the light emitter and guided by the light guide member.
  • the light receiver generates and outputs a third medium signal whose signal value changes depending on whether the medium is present at the position of the third medium sensor 115 or not, based on the intensity of the light it receives.
  • the third medium signal is an example of an output signal from the third medium sensor 115.
  • the fourth medium sensor 116 is arranged downstream of the feeding roller 112 and separation roller 113 and upstream of the imaging device 119 in the medium discharge direction A1. Further, the fourth medium sensor 116 is disposed at the center in the width direction A2 perpendicular to the medium discharge direction, particularly between the two first conveyance rollers 117 and between the two second conveyance rollers 118. . In the example shown in FIG. 3, the fourth medium sensor 116 is arranged downstream of the second medium sensor 114 and third medium sensor 115 and upstream of the first conveyance roller 117 and second conveyance roller 118.
  • the fourth medium sensor 116 is disposed at the same position as the second medium sensor 114 and the third medium sensor 115, or on the upstream side of the second medium sensor 114 and the third medium sensor 115, in the medium discharge direction A1. Good too. Further, the fourth medium sensor 116 may be arranged downstream of the first conveyance roller 117 and the second conveyance roller 118. The fourth medium sensor 116 detects the leading edge and trailing edge of the medium conveyed to that position.
  • the fourth medium sensor 116 includes a light emitter and a light receiver provided on one side with respect to the medium transport path, and a light guide member provided at a position facing the light emitter and the light receiver across the medium transport path.
  • the light guide member is a light guide tube such as a U-shaped prism.
  • the light emitter is an LED or the like, and emits light toward the conveyance path.
  • the light receiver is a photodiode or the like, and receives the light emitted by the light emitter and guided by the light guide member.
  • the light receiver generates and outputs a fourth medium signal whose signal value changes depending on whether the medium is present or absent at the position of the fourth medium sensor 116, based on the intensity of the received light.
  • the fifth medium sensor 120 is an example of a sensor, and is arranged between the imaging device 119 and the first and second ejection rollers 121 and 122. That is, the fifth medium sensor 120 is arranged downstream of the imaging device 119 and upstream of the first discharge roller 121 and the second discharge roller 122 in the medium discharge direction A1. Further, the fifth medium sensor 120 is disposed at the center in the width direction A2 perpendicular to the medium discharge direction, particularly between the two first discharge rollers 121 and between the two second discharge rollers 122. . The fifth medium sensor 120 detects the leading edge and trailing edge of the medium conveyed to that position.
  • the fifth medium sensor 120 includes a light emitter and a light receiver provided on one side with respect to the medium transport path, and a light guide member provided at a position facing the light emitter and the light receiver across the medium transport path.
  • the light guide member is a light guide tube such as a U-shaped prism.
  • the light emitter is an LED or the like, and emits light toward the conveyance path.
  • the light receiver is a photodiode or the like, and receives the light emitted by the light emitter and guided by the light guide member.
  • the light receiver generates and outputs a fifth medium signal whose signal value changes depending on whether the medium is present at the position of the fifth medium sensor 120 or not, based on the intensity of the light it receives.
  • the second medium sensor 114 the third medium sensor 115, the fourth medium sensor 116, and/or the fifth medium sensor 120
  • a reflective member such as a mirror may be used instead of the light guiding member.
  • the light emitter and the light receiver are provided at positions facing each other across the conveyance path. Good too.
  • the second medium sensor 114, the third medium sensor 115, the fourth medium sensor 116, and/or the fifth medium sensor 120 generate a predetermined current when the medium is in contact with the medium or when the medium is not in contact with the medium. The presence of the medium may be detected by a contact detection sensor or the like.
  • FIG. 4 is a block diagram showing a schematic configuration of the medium ejecting device 100.
  • the medium ejection device 100 further includes a motor 131, an interface device 132, a storage device 140, a processing circuit 150, and the like.
  • the motor 131 has one or more motors, and operates the feeding roller 112 , separation roller 113 , first conveyance roller 117 , second conveyance roller 118 , first discharge roller 121 , and 2. Rotate the discharge roller 122 to convey the medium.
  • one of the first conveyance roller 117 and the second conveyance roller 118 may be a driven roller that rotates following the other roller.
  • one of the first discharge roller 121 and the second discharge roller 122 may be a driven roller that rotates following the other roller.
  • the interface device 132 has an interface circuit similar to a serial bus such as a USB, and is electrically connected to an information processing device (for example, a personal computer, a mobile information terminal, etc.) (not shown) to transmit input images and various information. Send and receive.
  • an information processing device for example, a personal computer, a mobile information terminal, etc.
  • a communication unit having an antenna for transmitting and receiving wireless signals and a wireless communication interface device for transmitting and receiving signals through a wireless communication line according to a predetermined communication protocol may be used.
  • the predetermined communication protocol is, for example, a wireless LAN (Local Area Network).
  • the communication unit may include a wired communication interface device for transmitting and receiving signals through a wired communication line according to a communication protocol such as a wired LAN.
  • the storage device 140 includes a memory device such as a RAM (Random Access Memory) or a ROM (Read Only Memory), a fixed disk device such as a hard disk, or a portable storage device such as a flexible disk or an optical disk. Further, the storage device 140 stores computer programs, databases, tables, etc. used for various processes of the medium ejecting device 100.
  • the computer program may be installed in the storage device 140 from a computer-readable portable recording medium using a known setup program or the like.
  • the portable recording medium is, for example, a CD-ROM (compact disc read only memory), a DVD-ROM (digital versatile disc read only memory), or the like.
  • the processing circuit 150 operates based on a program stored in the storage device 140 in advance.
  • the processing circuit is, for example, a CPU (Central Processing Unit).
  • a DSP digital signal processor
  • an LSI large scale integration
  • an ASIC application specific integrated circuit
  • an FPGA field-programmable gate array
  • the processing circuit 150 includes an operating device 105, a display device 106, a first medium sensor 111, a second medium sensor 114, a third medium sensor 115, a fourth medium sensor 116, an imaging device 119, a fifth medium sensor 120, a motor 131, It is connected to the interface device 132, storage device 140, etc., and controls each of these parts.
  • the processing circuit 150 performs drive control of the motor 131, imaging control of the imaging device 119, etc., acquires an input image from the imaging device 119, generates a medium image, and transmits it to the information processing device via the interface device 132.
  • the processing circuit 150 detects the amount of inclination of the medium based on the input image, and when a part of the rear end of the medium passes the position of the fifth medium sensor 120, the processing circuit 150 detects the amount of inclination of the medium based on the amount of inclination. It is determined whether the entire edge has passed through the imaging position of the imaging device 119.
  • the processing circuit 150 controls the first discharge roller 121 and/or the second discharge roller 122 based on the determination result.
  • FIG. 5 is a diagram showing a schematic configuration of the storage device 140 and the processing circuit 150.
  • the storage device 140 stores a control program 141, a detection program 142, a determination program 143, a skew determination program 144, and the like.
  • Each of these programs is a functional module implemented by software running on a processor.
  • the processing circuit 150 reads each program stored in the storage device 140 and operates according to each read program. Thereby, the processing circuit 150 functions as a control section 151, a detection section 152, a determination section 153, and a skew determination section 154.
  • 6 and 7 are flowcharts showing an example of the operation of the medium reading process of the medium ejecting device 100.
  • a user inputs an instruction to read a medium using the operating device 105 or the information processing device, and the control unit 151 receives an operation signal instructing to read the medium from the operating device 105 or the interface device 132. (Step S101).
  • control unit 151 acquires a first medium signal from the first medium sensor 111, and determines whether or not a medium is placed on the mounting table 103 based on the acquired first medium signal (step S102). If no medium is placed on the mounting table 103, the control unit 151 ends the series of steps.
  • control unit 151 drives the motor 131.
  • the control unit 151 rotates the feeding roller 112, separation roller 113, first conveyance roller 117, second conveyance roller 118, first discharge roller 121, and/or second discharge roller 122 to convey the medium (step S103).
  • control unit 151 waits until the leading edge of the transported medium passes the position of the fourth medium sensor 116 (step S104).
  • the control unit 151 periodically acquires the fourth medium signal from the fourth medium sensor 116, and changes the signal value of the fourth medium signal from a value indicating that the medium is not present to a value indicating that the medium is present. When this happens, it is determined that the leading edge of the medium has passed the position of the fourth medium sensor 116.
  • the control unit 151 causes the imaging device 119 to start imaging the medium (step S105). Thereafter, the control unit 151 acquires the input image from the imaging device 119 at regular intervals (every time the imaging device 119 generates an input image) and stores it in the storage device 140.
  • the control unit 151 waits until a part of the rear end of the transported medium passes through the first imaging position P1 of the first imaging sensor 119c arranged upstream of the second imaging sensor 119d (Ste S106).
  • the control unit 151 periodically acquires the fourth medium signal from the fourth medium sensor 116, and changes the signal value of the fourth medium signal from a value indicating that the medium is present to a value indicating that the medium is not present.
  • it is determined that the rear end of the medium has passed the position of the fourth medium sensor 116.
  • the control unit 151 determines that a portion of the rear end of the medium has passed the first imaging position P1 when a first predetermined time has elapsed since the rear end of the medium passed the position of the fourth medium sensor 116.
  • the first predetermined time is set to a value obtained by adding or subtracting a margin from the time required for the medium to move from the fourth medium sensor 116 to the first imaging position P1. Note that the control unit 151 may determine that a portion of the rear end of the medium has passed the first imaging position P1 when a predetermined time has elapsed since the feeding of the medium was started.
  • control unit 151 When a portion of the rear end of the medium passes through the first imaging position P1, the control unit 151 generates a partial image by combining the input images acquired from the first imaging device 119a up to now (step S107).
  • FIG. 8 is a schematic diagram showing an example of the partial image N.
  • the partial image N shown in FIG. 8 includes the medium M1 that was conveyed at an angle. However, since the medium M1 is tilted, a part of the rear end of the medium M1 is not included in the partial image N. Since the partial image N is used to calculate the tilt angle (tilt amount) ⁇ of the medium M1, the partial image N does not need to include the entire rear end of the medium M1.
  • the control unit 151 generates the partial image N at a time when only a portion of the trailing edge of the medium M1 is included, so that the medium ejecting device 100 can detect the tilt amount ⁇ of the medium at an early stage.
  • the detection unit 152 detects the tilt amount ⁇ of the medium from the partial image N (step S108). That is, the detection unit 152 detects the tilt amount ⁇ of the medium based on the input image captured by the first image sensor 119c whose imaging position is upstream of the second image sensor 119d. Thereby, the detection unit 152 can detect the amount of inclination of the medium at an earlier stage.
  • the detection unit 152 sequentially detects the vertical direction of each pixel in each vertical line for each vertical line extending in the vertical direction (sub-scanning direction).
  • the absolute value of the difference between the gradation values of pixels on both sides (hereinafter referred to as an adjacent difference value) is calculated.
  • the predetermined range R is set to a range (for example, a range within 1000 pixels) that definitely includes the rear end of the medium.
  • the detection unit 152 detects pixels whose adjacent difference values exceed the gradation threshold in each vertical line as edge pixels.
  • the gradation value is a brightness value, a color value (R value, G value, or B value), or the like.
  • the gradation threshold is set, for example, to a difference in brightness value (for example, 20) that allows a person to visually distinguish a difference in brightness on an image.
  • the detection unit 152 detects the lowest edge pixel in each vertical line as a lower edge pixel.
  • the detection unit 152 may calculate the absolute value of the difference between the tone values of two pixels separated by a predetermined distance from each pixel in the horizontal or vertical direction as the adjacent difference value. Further, the detection unit 152 may detect edge pixels by comparing the tone value of each pixel with a threshold value. For example, the detection unit 152 detects that the gradation value of a specific pixel is less than a threshold value, and that the gradation value of a pixel adjacent to the specific pixel in the horizontal or vertical direction or a pixel separated by a predetermined distance is equal to or greater than the threshold value. If so, that specific pixel is detected as an edge pixel.
  • the detection unit 152 detects a straight line (line segment) from the lower edge pixel as the lower edge of the medium using the least squares method.
  • the detection unit 152 may detect straight lines using Hough transform.
  • the detection unit 152 may detect the straight line with the longest length in the horizontal direction (main scanning direction) as the lower side of the medium.
  • a straight line C1 and a straight line C2 are detected from the lower edge pixel, and the straight line C2 having a longer length in the horizontal direction (main scanning direction) is detected as the lower side of the medium.
  • the detection unit 152 detects the angle ⁇ between the detected straight line (lower side of the medium) and the horizontal direction as the amount of inclination of the medium.
  • the detection unit 152 detects the amount of positional deviation in the medium discharge direction A1 between the end position B1 on the side where the progress is delayed at the rear end of the medium and the position B2 facing the fifth medium sensor 120. is estimated (step S109).
  • the detection unit 152 Based on the inclination of the lower end of the medium, the detection unit 152 identifies the end on the side where progress is delayed among the left end and right end on the rear end of the medium.
  • the detection unit 152 detects, within the partial image, a lower end line extending in the horizontal direction (main scanning direction) located at the lowest position of the partial image N in the vertical direction (sub-scanning direction), in the same manner as in the process of step S109. , an end edge pixel B3 corresponding to the identified end is detected.
  • the detection unit 152 calculates adjacent difference values in order from the identified end side within the lower end line, and detects the pixel whose adjacent difference value first exceeds the gradation threshold as an end edge pixel B3.
  • the detection unit 152 calculates the horizontal distance (horizontal distance) x between the detected end edge pixel B3 and the pixel B4 corresponding to the fifth medium sensor 120 within the lower end line. Within the lower end line, the horizontal position of the pixel B4 corresponding to the fifth medium sensor 120 is based on the positional relationship between the first imaging position P1 of the first imaging sensor 119c and the arrangement position of the fifth medium sensor 120. , set in advance. Next, the detection unit 152 determines the end position B1 of the trailing end of the medium on the side where the progress is delayed and the fifth medium sensor based on the horizontal distance x and the tilt amount ⁇ using the following approximate equation (1). 120 and the opposing position B2 on the partial image is calculated (estimated). y ⁇ x ⁇ tan ⁇ (1)
  • the detection unit 152 determines the end position B1 of the rear end of the medium on the side where the progress is delayed, which corresponds to the positional deviation amount y on the partial image, and the fifth medium sensor 120.
  • the amount of positional deviation in the medium ejection direction A1 in real space between the opposing position B2 and the opposing position B2 is calculated.
  • the determination unit 153 waits until a portion of the rear end of the transported medium passes the position of the fifth medium sensor 120 (step S201).
  • the determining unit 153 periodically acquires a fifth medium signal from the fifth medium sensor 120, and changes the signal value of the fifth medium signal from a value indicating that a medium is present to a value indicating that a medium is not present. At this time, it is determined that a portion of the rear end of the medium has passed the position of the fifth medium sensor 120.
  • the determination unit 153 determines that when a portion of the rear end of the medium passes the position of the fifth medium sensor 120, the entire rear end of the medium is located in the imaging device based on the amount of inclination ⁇ of the medium detected by the detection unit 152. It is determined whether or not the vehicle has passed through the imaging position according to No. 119 (step S202).
  • the determining unit 153 determines, as the imaging position by the imaging device 119, a second imaging position P2 of the second imaging sensor 119d, which is located downstream of the first imaging position P1 of the first imaging sensor 119c, where the entire rear end of the medium is located. Determine whether it has passed. Thereby, the determining unit 153 can determine whether the entire rear end of the medium has passed through both the imaging position by the first imaging sensor 119c and the imaging position by the second imaging sensor 119d.
  • the determination unit 153 determines the position in the medium discharge direction A1 between the end position B1 of the trailing edge of the medium on the side where the progress is delayed and the position B2 facing the fifth medium sensor 120, which is detected by the detection unit 152. It is determined whether the amount of deviation is less than a predetermined distance L1.
  • the predetermined distance L1 is between the position of the fifth medium sensor 120 in the medium ejection direction A1 and the second imaging position P2 of the second imaging sensor 119d located downstream of the first imaging position P1 of the first imaging sensor 119c. (see Figure 3). That is, the determination unit 153 determines whether the end of the medium on the side where the trailing end is delayed has passed the second imaging position P2.
  • the determination unit 153 determines that the entire rear end of the medium has passed through the second imaging position P2 of the second imaging sensor 119d, and It is determined that the object is passing through the imaging position. On the other hand, if the displacement amount of the rear end of the medium is equal to or greater than the predetermined distance L1, the determination unit 153 determines that the entire rear end of the medium has not passed through the second imaging position P2 of the second image sensor 119d, and the image is It is determined that the object has not passed through the imaging position by the device 119.
  • the control unit 151 changes the rotational speed of the ejection roller.
  • the discharge roller is controlled to do so (step S203). Even if a change is made to the movement of the medium after the entire trailing edge of the medium has passed the imaging position by the imaging device 119, no effect will occur on the medium included in the medium image in which the medium is imaged.
  • the control unit 151 prevents distortion of the medium from occurring within the medium image by appropriately changing the rotational speed of the ejection roller.
  • the control unit 151 controls the discharge Decrease the rotation speed of the rollers. Thereby, the control unit 151 can increase the transport speed of the medium until the medium is imaged, and reduce the transport speed only during ejection. Therefore, the control unit 151 can reduce the total time required for the medium reading process while suppressing the occurrence of scattering of the media due to vigorous ejection.
  • the control unit 151 controls the rotational speed of the ejection roller.
  • the discharge roller is controlled so as not to change (step S204). If a change is made to the movement of the medium when the entire trailing edge of the medium has not passed the imaging position by the imaging device 119, the medium included in the medium image in which the medium is imaged will be affected. When the entire rear end of the medium has passed through the imaging position by the imaging device 119, the control unit 151 suppresses the occurrence of distortion of the medium in the medium image by not changing the rotational speed of each discharge roller. can.
  • control unit 151 controls the first discharge roller 121 and/or the second discharge roller 122 based on the determination result by the determination unit 153. Thereby, the control unit 151 can image the medium well and eject the medium well.
  • the control unit 151 waits until the entire rear end of the medium passes through the imaging position by the imaging device 119 (step S205).
  • the control unit 151 determines that the entire rear end of the medium has passed the imaging position by the imaging device 119 when a second predetermined time period has elapsed since the rear end of the medium passed the position of the fifth medium sensor 120 .
  • the second predetermined time is set to a margin time that takes into account the amount of tilt of the medium that the medium discharge device 100 allows. Note that if the determination unit 153 determines in step S202 that the entire trailing edge of the medium has passed the imaging position by the imaging device 119, the controller 151 determines that the entire trailing edge of the medium has already been captured by the imaging device 119. It is determined that the object is passing through the position.
  • control unit 151 generates a medium image from the imaging device 119 by combining the input images acquired from the imaging device 119 up to now, and transmits the generated medium image to the information processing device via the interface device 132. By doing so, it is output (step S206).
  • a media image is an example of an image based on an input image.
  • control unit 151 determines whether or not any medium remains on the mounting table 103 based on the first medium signal received from the first medium sensor 111 (step S207). If the medium remains on the mounting table 103, the control unit 151 returns the process to step S104 and repeats the processes of steps S104 to S109 and S201 to S207.
  • control unit 151 stops the motor 131. As a result, the control unit 151 stops the feeding roller 112, separation roller 113, first conveyance roller 117, second conveyance roller 118, first discharge roller 121, and second discharge roller 122 (step S208), and Finish the step.
  • the control unit 151 controls It is also possible to determine that a media jam has occurred and execute abnormality processing. As abnormality processing, the control unit 151 stops the motor 131 and removes the medium by the feeding roller 112, separation roller 113, first conveyance roller 117, second conveyance roller 118, first discharge roller 121, and second discharge roller 122. Stop transporting and discharging. Furthermore, as abnormality processing, the control unit 151 may display information indicating that a media jam has occurred on the display device 106 or notify the user by transmitting the information to the information processing device via the interface device 132. good.
  • the medium discharge device 100 determines whether the entire rear end of the medium has passed the imaging position based on the amount of inclination of the medium. If the object has passed the imaging position, the discharge speed is reduced. As a result, the medium ejecting device 100 is able to image the medium well and eject it well.
  • the medium ejecting device 100 can easily determine whether or not the ejection speed can be changed, and can image the medium well while suppressing an increase in the processing load in the medium reading process. It became possible to eject it. Further, the medium ejecting device 100 has a compact housing with a straight path mechanism, and is now able to image the medium well and eject the medium well.
  • FIG. 9 is a flowchart illustrating a part of the operation of the medium reading process of the medium ejecting device according to another embodiment.
  • the flowchart shown in FIG. 9 is executed instead of the flowchart shown in FIG.
  • the processes in steps S301 to S302, S307 to S308, and S311 to S312 in FIG. 9 are the same as the processes in steps S201 to S202, S205 to S206, and S207 to S208 in FIG. 7, and therefore the description thereof will be omitted.
  • steps S303 to S306 and S309 to S310 will be explained.
  • step S302 If it is determined in step S302 that the entire rear end of the medium has passed the imaging position when a part of the rear end of the medium passes the fifth medium sensor 120, the control unit 151 controls the rotation of the ejection roller.
  • the discharge roller is controlled to change the speed (step S303).
  • the control unit 151 reduces the rotational speed of the discharge roller similarly to the process in step S203.
  • the control unit 151 sets the image processing flag to OFF (step S304).
  • the image processing flag is a flag indicating whether or not image processing is to be performed on the input image.
  • control unit 151 also controls the rotation of the ejection roller.
  • the discharge roller is controlled to change the speed (step S305).
  • the control unit 151 reduces the rotational speed of the discharge roller similarly to the process in step S303.
  • control unit 151 sets the image processing flag to ON (step S306).
  • step S309 the control unit 151 determines whether the image processing flag is set to ON or OFF (Step S309). If the image processing flag is set to OFF, the control unit 151 moves the process to step S311 without executing any particular process.
  • the control unit 151 executes image processing on the medium image (step S310). Thereby, the control unit 151 can correct the distortion of the medium that occurs in the medium image while changing the conveyance speed of the medium during medium imaging. Therefore, the control unit 151 can suppress the scattering of the medium on the ejection table 104 and appropriately correct the distortion of the medium occurring within the medium image to obtain a good medium image.
  • the control unit 151 executes thinning processing on the medium image.
  • the control unit 151 uses known interpolation processing such as nearest neighbor interpolation, bilinear interpolation, bicubic interpolation, etc. to perform thinning processing in the sub-scanning direction on the area imaged in the medium image after changing the speed.
  • step S305 since the conveyance speed of the medium has decreased, the interval between each position in the medium imaged by the imaging device 119 becomes shorter. Therefore, within the medium image, the medium is imaged in a state where it is elongated in the vertical direction (sub-scanning direction).
  • the control unit 151 performs thinning processing so that the number of pixels in the sub-scanning direction of the area imaged after changing the speed in the medium image matches the number of pixels in the sub-scanning direction when the speed is not changed. Thereby, the control unit 151 can appropriately correct the elongation of the medium that occurs within the medium image, and can obtain a good medium image.
  • the control unit 151 controls the ejection roller. Image processing is performed on the media image while controlling the ejection roller to change its rotational speed. If it is determined that the entire trailing edge of the medium has passed through the imaging position when a portion of the trailing edge of the medium passes the fifth medium sensor 120, the control unit 151 reduces the rotational speed of the ejection roller. The thinning process is performed on the medium image while Thereby, even if the medium is conveyed at an angle, the control unit 151 can properly image the medium and discharge it properly.
  • the medium ejecting device 100 can eject the medium well while imaging the medium well even when the rotational speed of the ejecting roller is reduced when the entire trailing edge of the medium has not passed the imaging position. It became possible to do so.
  • FIG. 10 is a flowchart illustrating a part of the operation of the medium reading process of the medium ejection device according to yet another embodiment.
  • the flowchart shown in FIG. 10 is executed instead of the flowchart shown in FIG.
  • the processing in steps S402 to S403 and S406 to S409 in FIG. 10 is the same as the processing in steps S201 to S202 and S205 to S208 in FIG. 7, and therefore the description thereof will be omitted. Below, only the processing of steps S401 and S404 to S405 will be explained.
  • a plurality of first discharge rollers 121 and a plurality of second discharge rollers 122 are provided, and are arranged side by side at intervals in the width direction A2.
  • the plurality of first ejection rollers 121 and/or the plurality of second ejection rollers 122 are provided to rotate independently and eject the medium.
  • the plurality of first ejection rollers 121 and/or the plurality of second ejection rollers 122 are provided to be driven by respective separate motors.
  • the skew determination unit 154 determines whether or not a skew of the medium has occurred based on the amount of inclination ⁇ of the medium detected by the detection unit 152 (step S401). For example, the skew determination unit 154 determines that skew of the medium has occurred when the tilt amount ⁇ is equal to or greater than the tilt threshold, and determines that no skew of the medium has occurred when the tilt amount ⁇ is less than the tilt threshold. do.
  • the inclination threshold value is preset by prior experiments to the minimum value of the inclination amount (for example, 3°) at which a jam of the medium will occur if the inclination of the medium is not corrected.
  • step S406 If the skew determination unit 154 determines that no skew of the medium has occurred, the process proceeds to step S406 without executing the processes of steps S402 to S405. On the other hand, if the skew determining unit 154 determines that a skew of the medium has occurred, the process proceeds to step S402.
  • step S403 If it is determined in step S403 that the entire rear end of the medium has passed the imaging position when a part of the rear end of the medium passes the fifth medium sensor 120, the control unit 151 controls the rotation of the ejection roller.
  • the discharge roller is controlled to change the speed (step S404).
  • the control unit 151 controls the ejection roller to correct the skew (tilt) of the medium.
  • the control unit 151 causes the plurality of first ejection rollers 121 to have different circumferential speeds, and/or the plurality of second ejection rollers 122 to have different circumferential speeds. Correct the tilt of the media.
  • the control unit 151 sets each circumferential speed so that the circumferential speed of the ejecting roller located on the side where the medium is delayed is greater than the circumferential speed of the ejecting roller located on the leading side.
  • FIG. 11 is a schematic diagram for explaining skew correction of the medium.
  • FIG. 11 is a schematic diagram of the lower casing 101 in which the medium M2 is conveyed at an angle, viewed from the conveyance path side.
  • the medium M2 is tilted so that the left end of the rear end leads and the right end lags behind.
  • the control unit 151 sets each circumferential speed so that the circumferential speed of the first ejection roller 121 on the right side is higher than the circumferential speed of the first ejection roller 121 on the left side.
  • control unit 151 sets the circumferential speed of the ejection roller located on the side where the medium is lagging at a speed higher (faster) than the reference speed, and sets the circumferential speed of the ejection roller located on the side where the medium is ahead. Set to standard speed. Note that the control unit 151 sets the circumferential speed of the ejection roller located on the side where the progress of the medium is delayed to the reference speed, and sets the circumferential speed of the ejection roller located on the side where the medium is ahead to be lower (slower than the reference speed). ) speed may be set.
  • control unit 151 sets the circumferential speed of the ejection roller located on the side where the progress of the medium is delayed to a speed higher (faster) than the reference speed, and sets the circumferential speed of the ejection roller located on the side where the medium is ahead.
  • the speed may be set lower (slower) than the reference speed.
  • the control unit 151 returns the circumferential speed of each discharge roller to the reference speed after a predetermined period of time has elapsed since the start of the correction of the skew of the medium.
  • the amount of displacement Y of the rear end of the medium M2 in the medium ejection direction A1 at the center positions D1 and D2 of the two ejection rollers in the width direction A2 is as follows. It is calculated by equation (2).
  • Y X ⁇ tan ⁇ (2)
  • X is the distance between the center positions D1 and D2 of the two discharge rollers in the width direction A2.
  • ⁇ is the inclination angle (inclination amount) of the rear end of the medium M2.
  • the circumferential speed v2 of the ejection roller on the lagging side In order to cause the rear end of the medium on the lagging side to reach the center position of the ejection roller on the lagging side in the medium ejection direction A1 after a predetermined time t, the circumferential speed v2 of the ejection roller on the lagging side must be , needs to be set as shown in equation (3) below.
  • v2 (L2+Y/2)/t (3)
  • L2 is the distance between the fifth medium sensor 120 and the center position of the discharge roller in the medium discharge direction A1.
  • the medium ejection device 100 sets the circumferential speed v2 of the ejection roller on the lagging side and the circumferential speed v1 of the ejection roller on the leading side so as to satisfy the following equation (5). , the skew of the medium can be appropriately corrected.
  • v1/v2 (L2-Y/2)/(L2+Y/2) (5)
  • control unit 151 corrects the skew of the medium. No (step S405).
  • control unit 151 controls whether the entire rear end of the medium passes through the imaging position when a portion of the rear end of the medium passes the fifth medium sensor 120 in a state where it is determined that skew of the medium has occurred. If it is determined that the media is skewed, the ejection roller is controlled to correct the skew of the medium. On the other hand, the control unit 151 controls whether the entire rear end of the medium passes through the imaging position when a portion of the rear end of the medium passes the fifth medium sensor 120 in a state where it is determined that skew of the medium has occurred. If it is determined that the media is not skewed, the media skew is not corrected. Thereby, even if the medium is conveyed at an angle, the control unit 151 can properly image the medium and discharge it properly.
  • step S404 the control unit 151 completes the correction of the skew of the medium before the ejection roller reaches the center position in the medium ejection direction A1, and then reduces the rotational speed of the ejection roller.
  • the control unit 151 corrects the skew of the medium until it reaches the center position between the fifth medium sensor 120 and the center position of the ejection roller in the medium ejection direction A1, and then reduces the rotational speed of the ejection roller. .
  • the circumferential speed v2 of the discharging roller on the lagging side and the circumferential velocity v1 of the discharging roller on the leading side are calculated by the following formula (6) instead of the above formulas (3) and (4). ), (7).
  • v2 (L2/2+Y/2)/t (6)
  • v1 (L2/2-Y/2)/t (7)
  • the skew determination unit 154 determines that if the positional deviation amount Y is less than the distance L1 between the position of the fifth medium sensor 120 and the second imaging position P2 of the second imaging sensor 119d, skew of the medium has occurred. It may be determined that the In that case, the control unit 151 does not correct the skew of the medium if the positional deviation amount Y is less than the distance L1.
  • the control unit 151 may perform image processing on the medium image while correcting the skew of the medium. In that case, in step S404, the control unit 151 sets the image processing flag to OFF. On the other hand, in step S405, the control unit 151 sets the image processing flag to ON while correcting the skew of the medium in the same manner as in the process of step S404. In step S407, if the image processing flag is set to ON, the control unit 151 performs image processing on the medium image. Using a known image processing technique, the control unit 151 performs a conversion process on a region of the medium image captured after changing the speed so that the medium included in the medium image becomes a rectangle.
  • the medium ejecting device 100 performs skew correction if the entire rear end of the medium has passed the imaging position when part of the rear end of the medium has passed a predetermined position. . In this case as well, the medium ejection device 100 was able to image the medium well and eject it well.
  • FIG. 12 is a flowchart illustrating a part of the operation of the medium reading process of the medium ejection device according to yet another embodiment.
  • the flowchart shown in FIG. 12 is executed instead of the flowchart shown in FIG.
  • the processing in steps S501 to S505 in FIG. 12 is the same as the processing in steps S101 to S105 in FIG. 6, so a description thereof will be omitted. Below, only the processing of steps S506 to S508 will be explained.
  • step S506 the control unit 151 waits until the rear end of the transported medium passes both the position of the second medium sensor 114 and the position of the third medium sensor 115 (step S506).
  • the control unit 151 periodically acquires a second medium signal from the second medium sensor 114, and changes the signal value of the second medium signal from a value indicating that a medium is present to a value indicating that a medium is not present. When this occurs, it is determined that the rear end of the medium has passed the position of the second medium sensor 114.
  • the control unit 151 periodically acquires a third medium signal from the third medium sensor 115, and changes the signal value of the third medium signal from a value indicating that a medium is present to a value indicating that a medium is not present. When the value changes to the value, it is determined that the rear end of the medium has passed the position of the third medium sensor 115.
  • the detection unit 152 determines the amount of inclination ⁇ of the medium based on the timing when the rear end of the transported medium passes the position of the second medium sensor 114 and the timing when the position of the third medium sensor 115 passes. is detected (step S507).
  • Y2 is the distance that the rear end of the medium moves from passing one of the positions of the second medium sensor 114 and the third medium sensor 115 to passing the other.
  • the distance Y2 is calculated by multiplying the time elapsed from when the rear end of the medium passes one of the positions of the second medium sensor 114 and the third medium sensor 115 until it passes the other by the transport speed of the medium. It is calculated by W is the distance in the width direction A2 between the second medium sensor 114 and the third medium sensor 115.
  • the detection unit 152 detects the tilt amount ⁇ of the medium based on the second medium signal from the second medium sensor 114 and the third medium signal from the third medium sensor 115.
  • the detection unit 152 can detect the amount of inclination of the medium earlier.
  • the detection unit 152 detects the amount of positional deviation in the medium discharge direction A1 between the end position B1 on the side where the progress is delayed at the rear end of the medium and the position B2 facing the fifth medium sensor 120. is estimated (step S508).
  • the detection unit 152 detects the rear end of the medium between the left end and the right end of the medium based on the timing when the rear end of the medium passes the position of the second medium sensor 114 and the timing when the rear end of the medium passes the position of the third medium sensor 115. Identify the end where progress is slowing.
  • the detection unit 152 calculates adjacent difference values in order from the identified edge side in the latest input image, and selects the pixel whose adjacent difference value first exceeds the gradation threshold as the edge corresponding to the identified edge. Detected as an edge pixel.
  • the detection unit 152 calculates the horizontal distance between the detected end edge pixel and the pixel corresponding to the fifth medium sensor 120 in the input image.
  • the horizontal position of the pixel corresponding to the fifth medium sensor 120 is based on the positional relationship between the first imaging position P1 of the first imaging sensor 119c and the arrangement position of the fifth medium sensor 120. Set in advance.
  • the detection unit 152 detects, based on the resolution of the input image, the position of the rear end of the medium on the side where the progress is delayed and the position facing the fifth medium sensor 120, which corresponds to the horizontal distance on the input image.
  • the distance x' in the width direction A2 in real space between the two is calculated.
  • the detection unit 152 determines the end position B1 of the trailing end of the medium on the side where the progress is delayed based on the distance x' and the tilt amount ⁇ using the following approximate equation (10), and the fifth medium sensor 120 and the opposing position B2 on the partial image is calculated (estimated). y' ⁇ x' ⁇ tan ⁇ (10)
  • the medium discharge device 100 arranges a large number of medium sensors side by side along the width direction A2, and detects the rear end of the medium being conveyed in the width direction A2 based on the medium detection signal from each medium sensor. May be specified.
  • the medium ejecting device 100 sets the rear end of the medium to be conveyed at a position where the end of the medium in the width direction A2 passes when the medium of the maximum size supported by the medium ejecting device 100 is conveyed without tilting. It may be regarded as the end of the width direction A2.
  • the medium ejection device 100 detects the amount of inclination of the medium based on the second medium signal from the second medium sensor 114 and the third medium signal from the third medium sensor 115. It has now become possible to properly image and discharge the liquid.
  • FIG. 13 is a schematic diagram for explaining a medium discharge device 200 according to another embodiment.
  • FIG. 13 is a schematic diagram of the lower housing 101 in an open state viewed from the conveyance path side.
  • the medium discharge device 200 has each part that the medium discharge device 100 has. However, the medium discharge device 200 includes a plurality of fifth medium sensors 220 instead of the fifth medium sensor 120.
  • the plurality of fifth medium sensors 220 are an example of the plurality of detection sensors.
  • the plurality of fifth medium sensors 220 are arranged between the imaging device 119 and the first and second ejection rollers 121 and 122, that is, on the downstream side of the imaging device 119 in the medium ejection direction A1 and between the first and second ejection rollers 121 and 122. It is arranged upstream of the discharge roller 122. Further, the plurality of fifth medium sensors 220 are arranged side by side at intervals in the width direction A2 perpendicular to the medium discharge direction. In particular, the plurality of fifth medium sensors 220 are arranged between the two first discharge rollers 121 and between the two second discharge rollers 122 in the width direction A2 perpendicular to the medium discharge direction. Each of the plurality of fifth medium sensors 220 has the same configuration and function as the fifth medium sensor 120.
  • the medium ejecting device 200 executes the medium reading process shown in FIG. 6 or 12, and FIG. 7, FIG. 9, or FIG. However, in step S201 of FIG. 7, step S301 of FIG. 9, or step S402 of FIG. Wait until you have passed one position.
  • the determination unit 153 determines that the entire rear end of the medium is detected in step S202, step S302, or step S403. is passing through the imaging position by the imaging device 119.
  • the medium discharging device 200 can remove the entire rear end of the medium earlier than when only one fifth medium sensor 120 is used. It can be determined whether or not the image is passing through the imaging position by the imaging device 119. Therefore, the medium ejection device 200 can start changing the medium ejection speed or correcting the skew of the medium at an earlier timing, and can eject the medium better.
  • FIG. 13 shows an example in which the medium M3 is conveyed in an inclined manner such that the left end of the trailing end leads and the right end lags behind.
  • the fifth medium sensor 220 placed on the left side detects the rear end of the medium before the fifth medium sensor 220 placed on the right side.
  • the control unit 151 determines that the end on the side of the fifth medium sensor 220 that detected the rear end of the medium first is in front, and the end on the opposite side is behind.
  • control unit 151 sets the circumferential speed of the ejection roller located on the side where the medium is lagging at a speed higher (faster) than the reference speed, and sets the circumferential speed of the ejection roller located on the side where the medium is ahead. Set to standard speed. Note that the control unit 151 sets the circumferential speed of the ejection roller located on the side where the progress of the medium is delayed to the reference speed, and sets the circumferential speed of the ejection roller located on the side where the medium is ahead to be lower (slower than the reference speed). ) speed may be set.
  • control unit 151 sets the circumferential speed of the ejection roller located on the side where the progress of the medium is delayed to a speed higher (faster) than the reference speed, and sets the circumferential speed of the ejection roller located on the side where the medium is ahead.
  • the speed may be set lower (slower) than the reference speed.
  • the control unit 151 returns the circumferential speed of each discharge roller to the reference speed after a predetermined period of time has elapsed since the start of the correction of the skew of the medium.
  • the circumferential speed v1 of the preceding side ejection roller is required. needs to be set as shown in equation (12) below.
  • v1 (L2-Ya)/t (12)
  • L2 is the distance between the fifth medium sensor 220 and the center position of the discharge roller in the medium discharge direction A1.
  • Xb is the distance in the width direction A2 between the center position D2 in the width direction A2 of the discharge roller arranged on the delayed side and the arrangement position of the fifth medium sensor 220 that detected the trailing edge of the medium. It is.
  • the medium ejecting device 100 sets the circumferential speed v2 of the ejecting roller on the lagging side and the circumferential speed v1 of the ejecting roller on the leading side so as to satisfy the following equation (15). , the skew of the medium can be appropriately corrected.
  • v1/v2 (L2-Ya)/(L2+Yb) (15)
  • the medium ejecting device 200 executes the medium reading process shown in FIG. and the amount of positional deviation may be detected.
  • step S506 the control unit 151 waits until the rear end of the transported medium passes both positions of the plurality of fifth medium sensors 220.
  • the control unit 151 periodically acquires a fifth medium signal from each fifth medium sensor 220, and changes the signal value of each fifth medium signal from a value indicating that a medium is present to a value indicating that a medium is not present. , it is determined that the rear end of the medium has passed the position of each fifth medium sensor 220.
  • step S507 the detection unit 152 detects the tilt amount ⁇ of the medium based on the timing at which the rear end of the transported medium passes the position of each fifth medium sensor 220.
  • the detection unit 152 calculates the tilt amount ⁇ of the medium using the following equation (16).
  • ⁇ tan -1 (Y3/W2) (16)
  • Y3 is the distance that the rear end of the medium moves from passing the position of one fifth medium sensor 220 to passing the position of another fifth medium sensor 220.
  • the distance Y3 is calculated by multiplying the time elapsed from when the trailing edge of the medium passes the position of one fifth medium sensor 220 until it passes the position of another fifth medium sensor 220 by the transport speed of the medium.
  • W2 is the distance in the width direction A2 between the two fifth medium sensors 220.
  • step S508 the detection unit 152 detects a positional deviation in the medium ejection direction A1 between the end position B1 on the side where the progress is delayed at the rear end of the medium and the position B2 facing the fifth medium sensor 220. Estimate the amount.
  • the detection unit 152 detects, based on the timing when the rear end of the medium passes the position of each fifth medium sensor 220, the left end and the right end of the medium, whichever is slower in advancing at the rear end of the medium. Identify.
  • the detection unit 152 detects end edge pixels in the latest input image as described with reference to FIG. Note that if the trailing edge of the medium has already passed the imaging position and no edge edge pixels are detected in the latest input image, the detection unit 152 detects the edge edge pixels of each generated input image. Detect end edge pixels from the selected input image in the newest order until the end edge pixels are detected.
  • the detection unit 152 determines, based on the distance x′ and the inclination amount ⁇ , the end position B1 of the rear end of the medium on the side where the progress is delayed, and the position facing the fifth medium sensor 220, using the above-mentioned approximation formula (10).
  • the vertical positional shift amount y' on the partial image between the position B2 and the position B2 is calculated (estimated).
  • the medium discharge device 100 arranges a large number of fifth medium sensors 220 side by side along the width direction A2, and detects the rear end of the medium being conveyed based on the fifth medium signal from each fifth medium sensor 220.
  • the end portion in the width direction A2 may be specified.
  • the medium ejection device 200 includes a plurality of fifth medium sensors 220, it is now possible to image the medium well and eject the medium well.
  • FIG. 14 is a flowchart showing another example of the operation of the medium reading process of the medium ejecting device 200.
  • the medium reading process shown in FIG. 14 is executed instead of the medium reading process shown in FIG. 6 or 12, and FIG. 7, FIG. 9, or FIG.
  • the processing in steps S601 to S605 in FIG. 14 is similar to the processing in steps S101 to S105 in FIG. 6, and the processing in steps S606 to S609 in FIG. 14 is similar to the processing in steps S205 to S208 in FIG.
  • FIG. 15 is a flowchart illustrating an example of the operation of the detection process of the medium ejecting device 200.
  • FIG. 15 An example of the operation of the detection process of the medium ejecting device 200 will be described with reference to the flowchart shown in FIG. 15. Note that the operation flow described below is mainly executed by the processing circuit 150 in cooperation with each element of the medium ejecting device 100 based on a program stored in the storage device 140 in advance.
  • the medium reading process shown in FIG. 15 is executed every time one medium is transported when the medium reading process shown in FIG. 14 is executed.
  • control unit 151 waits until the rear end of the transported medium passes the position of one of the plurality of fifth medium sensors 220 (step S701).
  • control unit 151 stores in the storage device 140 the passing time at which the rear end of the transported medium passed the position of one of the fifth medium sensors 220 (step S702).
  • the control unit 151 executes a first correction process (step S703).
  • the control unit 151 executes skew correction of the medium by conveying the medium imaged by the imaging device 119 while making the circumferential speeds of the plurality of discharge rollers different from each other.
  • the control unit 151 causes the plurality of first ejection rollers 121 to have different circumferential speeds, and/or the plurality of second ejection rollers 122 to have different circumferential speeds, thereby discharging the medium. Perform skew correction.
  • the control unit 151 determines that the circumferential velocity of the discharge roller disposed on the side of the fifth medium sensor 220 that has not detected the trailing edge of the medium among the plurality of discharge rollers is the same as that of the fifth medium sensor 220 that has detected the trailing edge of the medium.
  • Each circumferential speed is set to be higher than the circumferential speed of the discharging roller disposed on the side. That is, the control unit 151 sets each circumferential speed so that the circumferential speed of the ejecting roller located on the side where the medium is lagging is higher than the circumferential speed of the ejecting roller located on the leading side. .
  • the control unit 151 sets the speed ratio of the circumferential speeds of the plurality of discharge rollers to a fixed value (for example, 2:1).
  • control unit 151 sets the circumferential speed of the ejection roller located on the side where the progress of the medium is delayed to a speed higher than the reference speed (for example, twice the speed), and Set the circumferential speed of the reference speed.
  • control unit 151 sets the circumferential speed of the ejection roller located on the side where the progress of the medium is delayed to the reference speed, and sets the circumferential speed of the ejection roller located on the side where the medium is ahead to a speed lower than the reference speed ( For example, it may be set to 1/2 the speed.
  • control unit 151 sets the circumferential speed of the discharge roller located on the side where the progress of the medium is delayed to a speed higher than the reference speed (for example, 3/2 times the speed), and sets the peripheral speed of the discharge roller located on the side where the medium is ahead.
  • the circumferential speed of the discharge roller may be set to a speed lower than the reference speed (for example, 3/4 times the speed).
  • control unit 151 waits until the rear end of the transported medium passes the position of the other fifth medium sensor 220 of the plurality of fifth medium sensors 220 (step S704).
  • control unit 151 controls the position of the other fifth medium sensor 220 .
  • the elapsed time until passing the position is calculated (step S705).
  • the control unit 151 calculates the time from the passing time stored in the storage device 140 in step S702 to the current time as the elapsed time.
  • the control unit 151 determines whether the calculated elapsed time is less than or equal to the first threshold (step S706).
  • the first threshold value is within the range of elapsed time calculated when the rear end of the medium passes the positions of both fifth medium sensors 220 and overlaps the ejection roller disposed on the preceding side. Set.
  • the first threshold value is the elapsed time calculated when the rear end of the medium passes the positions of both fifth medium sensors 220 and is located at the center position of the ejection roller disposed on the preceding side. is set to
  • the control unit 151 stops the first correction process and does not perform skew correction of the medium thereafter (step S707).
  • the control unit 151 changes the circumferential speeds of the plurality of discharge rollers to the same speed to convey the medium. If the elapsed time is greater than the first threshold, the trailing edge of the medium has already passed the position of the discharge roller disposed on the preceding side, and there is a high possibility that the inclination of the medium will not be improved thereafter. In this case, by not performing skew correction on the medium, the control unit 151 can suppress damage to the medium due to force (load) being applied to the medium in the width direction A2.
  • the control unit 151 may further determine whether the elapsed time is greater than a third threshold that is greater than the first threshold.
  • the third threshold value is within the range of elapsed time calculated when the rear end of the medium passes the positions of both fifth medium sensors 220 and overlaps the ejection roller disposed on the preceding side. Set.
  • the third threshold value is determined based on the point at which the trailing edge of the medium passes through the positions of both the fifth medium sensors 220 and the end of the ejection roller on the side of the ejection roller disposed on the preceding side that is delayed in progress. It is set to the elapsed time calculated when the medium is located at the center position in the medium ejection direction A1 above.
  • the control unit 151 determines that the inclination of the medium is extremely large and that a medium conveyance abnormality has occurred, and executes abnormality processing. As abnormality processing, the control unit 151 stops the motor 131 and stops discharging the medium. Further, as abnormality processing, the control unit 151 notifies the user by displaying information indicating that a medium transport abnormality has occurred on the display device 106 or transmitting it to the information processing device via the interface device 132. Good too. On the other hand, if the elapsed time is less than or equal to the third threshold, the control unit 151 causes the medium to be ejected without performing the skew correction of the medium. Thereby, the medium ejection device 200 can more reliably suppress the occurrence of damage to the medium or notify the user of a warning when the inclination of the medium is too large.
  • the control unit 151 determines whether or not the elapsed time is less than or equal to a second threshold, which is smaller than the first threshold (step S708).
  • the second threshold value is determined such that when the rear end of the medium passes the positions of both fifth medium sensors 220, the center of rotation of the rear end of the medium is aligned with the discharge roller disposed on the preceding side in the medium discharge direction A1. It is set within the range of elapsed time calculated in the case of overlap.
  • the second threshold value is determined when the rotation center of the rear end of the medium is located on the preceding side when viewed from the width direction A2 when the rear end of the medium passes the positions of both fifth medium sensors 220. It is set within the range of the elapsed time calculated when the time overlaps with the discharge roller. For example, the second threshold value is determined when the rotation center of the rear end of the medium is disposed on the preceding side in the medium discharge direction A1 when the rear end of the medium passes the positions of both fifth medium sensors 220. It is set to the elapsed time calculated when the roller is located at the center position.
  • the control unit 151 executes the second correction process (step S709).
  • the control unit 151 conveys the medium imaged by the imaging device 119 while making the circumferential speeds of the plurality of ejection rollers different from each other, thereby reducing the skew of the medium.
  • Perform correction For example, the control unit 151 executes the same correction process as the first correction process as the second correction process. That is, the control unit 151 continues the first correction process.
  • control unit 151 sets each circumferential speed so that the circumferential speed of the ejecting roller located on the side where the medium is lagging is higher than the circumferential speed of the ejecting roller located on the leading side. do.
  • the control unit 151 sets the speed ratio of the circumferential speeds of the plurality of discharge rollers to a fixed value.
  • the control unit 151 can eliminate the tilt of the medium and eject the medium favorably.
  • the control unit 151 executes the third correction process (step S710).
  • the control unit 151 conveys the medium imaged by the imaging device 119 while making the circumferential speeds of the plurality of ejection rollers different from each other, thereby reducing the skew of the medium. Perform correction.
  • the control unit 151 executes a correction process that is different from the first correction process, particularly a correction process that corrects the inclination of the medium to a greater degree than the first correction process.
  • control unit 151 sets each circumferential speed so that the circumferential speed of the ejecting roller located on the side where the medium is delayed is higher than the circumferential speed of the ejecting roller located on the preceding side.
  • the control unit 151 sets the speed ratio of the circumferential speeds of the plurality of discharge rollers to a variable value, particularly to a variable value depending on the elapsed time.
  • the control unit 151 sets the speed ratio of the circumferential speeds of the plurality of discharge rollers so that the longer the elapsed time, the greater the speed difference between the discharge rollers.
  • control unit 151 controls the control unit 151 so that the longer the elapsed time, the smaller the speed ratio of the circumferential speed of the ejection roller located on the preceding side to the circumferential speed of the ejection roller located on the side where the progress of the medium is delayed. , the speed ratio of the circumferential speeds of the plurality of discharge rollers is set.
  • the control unit 151 can further eliminate the inclination of the medium and eject the medium favorably.
  • the control unit 151 controls multiple The speed ratio of the circumferential speed of the discharge roller is set based on the elapsed time. Thereby, the control unit 151 can appropriately correct the inclination of the medium according to the current degree of inclination of the medium, and can eject the medium favorably.
  • control unit 151 waits until the ejection of the medium is completed (step S711), and ends the series of steps.
  • the control unit 151 determines that the ejection of the medium is completed when a third predetermined period of time has elapsed since the rear end of the transported medium passed both positions of the plurality of fifth medium sensors 220.
  • the third predetermined time is set to a value obtained by adding a margin to the time required for the medium to move from the fifth medium sensor 220 to the position of the first discharge roller 121.
  • FIGS. 16 and 17 are schematic diagrams for explaining the state of the medium to be discharged.
  • FIGS. 16 and 17 are schematic diagrams of a part of the lower housing 101 in an open state, viewed from the conveyance path side.
  • a straight line E1 indicates an extension line of the rear end of the medium when the rear end of the preceding side passes one (left) fifth medium sensor 220
  • a straight line E2 indicates a line in which the trailing edge of the medium is delayed. It shows an extension line of the rear end of the medium when the rear end of the side passing through the fifth medium sensor 220 on the other side.
  • the rotation center R0 of the rear end of the medium is located on a straight line E extending along the medium discharge direction A1.
  • the straight line E is separated by a distance W4 from the center position D1 of the first ejection roller 121 on the preceding side (left side) to the side opposite to the first ejection roller 121 on the side that is delayed (on the right side). position.
  • Z1 moves the point R1 on the center position D1 of the first discharge roller 121 on the preceding side of the rear end of the medium located on the straight line E1 to the same position as the rotation center R0 in the medium discharge direction A1.
  • Z2 is the distance in the medium discharge direction A1 between the point R2 and the point R0. That is, Z2 is a point R2 on the center position D2 of the first ejection roller 121 on the side where the progress is delayed at the rear end of the medium located on the straight line E1, to the same position as the rotation center R0 in the medium ejection direction A1. This is the distance to move up to.
  • the inclination ⁇ 1 of the rear end of the medium (straight line E1) when the trailing end on the preceding side passes one of the fifth medium sensors 220 is calculated by the following equation (20).
  • ⁇ 1 tan -1 (Z0/W5) (20)
  • Z0 is the distance in the medium discharge direction A1 between the fifth medium sensor 220 and the rotation center R0.
  • W5 is the distance in the width direction A2 between the fifth medium sensor 220 on the preceding side and the rotation center R0, and is calculated by the following equation (21).
  • W5 W4+(W3-W2)/2 (21)
  • the inclination ⁇ 2 of the rear end of the medium (straight line E2) when the rear end of the side whose progress is delayed passes the other fifth medium sensor 220 is calculated by the following equation (22).
  • ⁇ 2 tan -1 (Z0/W6) (22)
  • W6 is the distance in the width direction A2 between the fifth medium sensor 220 on the side where the progress is delayed and the rotation center R0, and is calculated by the following equation (23).
  • W6 W4+(W3+W2)/2 (23)
  • T T1-T2 (24)
  • T1 is the time from when the trailing end of the preceding side passes one of the fifth medium sensors 220 until the skew correction is completed.
  • T2 is the time from when the rear end on the side that is delayed in progress passes the other fifth medium sensor 220 until the skew correction is completed.
  • T1 ⁇ u1 Z1 (25)
  • Z1:Z0 W4:W5 (26) That is, the distance Z1 has a linear relationship with the distance Z0 in the medium discharge direction A1 between the fifth medium sensor 220 and the rotation center R0.
  • T2 ⁇ u2 Z4
  • Z4 is a point R4 on the center position D2 of the first ejection roller 121 on the side where the progress is delayed at the rear end of the medium located on the straight line E2, which is the same as the rotation center R0 in the medium ejection direction A1. This is the distance to move to the desired position.
  • the following equation (28) holds true for the distance Z4.
  • Z4:Z0 (W3+W4):W6 (28) That is, the distance Z4 has a linear relationship with the distance Z0 in the medium discharge direction A1 between the fifth medium sensor 220 and the rotation center R0.
  • the elapsed time T during which the rear end of the medium passes the two fifth medium sensors 220 is the distance in the medium discharge direction A1 between the fifth medium sensor 220 and the rotation center R0. It has a proportional relationship with Z0. Further, the distance Z0 in the medium discharge direction A1 between the fifth medium sensor 220 and the rotation center R0 is uniquely calculated from the elapsed time T during which the rear end of the preceding side passes the two fifth medium sensors 220. be done.
  • the second threshold value is such that, for example, when the rear end of the medium passes the positions of both fifth medium sensors 220, the center of rotation of the rear end of the medium is shifted to the preceding side in the medium discharge direction A1. It is set to the elapsed time calculated when the discharge roller is located at the center position of the disposed discharge rollers. That is, the second threshold value is such that the distance Z0 between the fifth medium sensor 220 and the center of rotation R0 in the medium discharge direction A1 is equal to the distance L2 between the fifth medium sensor 220 and the center position of the discharge roller in the medium discharge direction A1. It is set to the elapsed time T when it matches.
  • the rotation center R0 of the rear end of the medium When the elapsed time T is less than or equal to the second threshold value, the rotation center R0 of the rear end of the medium is located upstream from the center position of the ejection roller, as shown in FIG. 16, and the speed ratio of the ejection roller is at the current setting. If it remains as it is, it is likely that the ejection roller will completely eliminate the media skew. On the other hand, when the elapsed time is greater than the second threshold, the rotation center R0 of the rear end of the medium is located downstream of the center position of the discharge roller, as shown in FIG.
  • the medium ejecting device 100 appropriately corrects the skew of the medium according to the current inclination of the medium by changing the method of correcting the skew of the medium depending on whether the elapsed time T is less than or equal to the second threshold value. This can be corrected and the medium can be properly ejected.
  • the inclinations ⁇ 1 and ⁇ 2 of the rear end of the medium when the rear end of the medium passes each of the fifth medium sensors 220 are calculated from the distance Z0 calculated from the elapsed time T using the above equations (20) and (22).
  • FIG. 18(A) shows the relationship between the elapsed time T during which the rear end of the medium passes the two fifth medium sensors 220 and the distance Z0 in the medium discharge direction A1 between the fifth medium sensor 220 and the rotation center R0.
  • This is an example of a graph 1800 showing a relationship.
  • the horizontal axis indicates the elapsed time T [sec]
  • the vertical axis indicates the distance Z0 [mm].
  • the distance W2 between the two fifth medium sensors 220 is 45 [mm]
  • the distance W3 between the center positions D1 and D2 of the two discharge rollers is 70 [mm]
  • each An example will be shown in which the circumferential speeds u1 and u2 of the discharge rollers are 200 and 400 [mm/sec].
  • the elapsed time T during which the rear end of the medium passes the two fifth medium sensors 220 and the distance Z0 in the medium discharge direction A1 between the fifth medium sensor 220 and the rotation center R0 are have a proportional relationship.
  • the medium discharge device 100 can correctly identify the rotational center position of the rear end of the medium from the elapsed time T during which the rear end of the medium passes the two fifth medium sensors 220. Since the medium discharge device 100 can easily and accurately calculate the elapsed time T during which the rear end of the medium passes through the two fifth medium sensors 220, the rotation center position of the rear end of the medium can be easily and accurately determined. be able to. From the graph 1800, when the distance L2 in the medium ejection direction A1 between the fifth medium sensor 220 and the center position of the ejection roller is 8 [mm], the second threshold value is set to 0.012 [sec]. It is preferable.
  • FIG. 18(B) is a graph showing the relationship between the elapsed time T during which the rear end of the medium passes the two fifth medium sensors 220 and the time from the start of skew correction to the completion of skew correction. This is an example of 1810.
  • FIG. 18(B) shows an example with the same conditions as FIG. 18(A). Note that FIG. 18(B) is an example in which the circumferential speeds u1 and u2 of each discharge roller are continuously set to 200 and 400 [mm/sec] and skew correction is executed regardless of the length of the elapsed time T. shows.
  • the medium ejecting device 100 can correctly specify the time until the skew correction is completed from the elapsed time T during which the rear end of the medium passes the two fifth medium sensors 220. Since the medium ejecting device 100 can easily and accurately calculate the elapsed time T during which the rear end of the medium passes the two fifth medium sensors 220, the time until the skew correction is completed can be easily and accurately determined. be able to.
  • FIG. 19(A) is an example of a graph 1900 showing the relationship between the elapsed time T during which the rear end of the medium passes the two fifth medium sensors 220 and the inclination ⁇ 1 of the medium before performing skew correction. be.
  • FIG. 19(A) the horizontal axis indicates the elapsed time T [sec] during which the rear end of the medium passes the two fifth medium sensors 220, and the vertical axis indicates the inclination ⁇ 1 of the medium before performing skew correction. Indicates [deg].
  • FIG. 19(A) shows an example with the same conditions as FIG. 18(A). As shown in graph 1900, there is a proportional relationship between the elapsed time T during which the rear end of the medium passes the two fifth medium sensors 220 and the inclination ⁇ 1 of the medium before performing skew correction.
  • the medium discharge device 100 can correctly identify the inclination ⁇ 1 of the medium before performing the skew correction from the elapsed time T during which the rear end of the medium passes the two fifth medium sensors 220. Since the medium discharge device 100 can easily and accurately calculate the elapsed time T during which the rear end of the medium passes the two fifth medium sensors 220, the medium ejection device 100 can easily and accurately calculate the inclination ⁇ 1 of the medium before performing skew correction. can be specified.
  • FIG. 19B shows a graph 1900 showing the relationship between the inclination ⁇ 0 corrected until the rear end of the medium passes both fifth medium sensors 220 and the inclination ⁇ 1 of the medium before performing skew correction. This is an example.
  • FIG. 19(B) the horizontal axis represents the tilt ⁇ 0 [deg] that is corrected until the rear end of the medium passes both fifth medium sensors 220, and the vertical axis represents the slope of the medium before performing the skew correction.
  • the slope ⁇ 1 [deg] is shown.
  • FIG. 19(B) shows an example with the same conditions as FIG. 18(A). As shown in the graph 1910, there is a proportional relationship between the tilt ⁇ 0 that is corrected until the rear end of the medium passes both of the fifth medium sensors 220 and the tilt ⁇ 1 of the medium before performing the skew correction.
  • FIG. 20(A) shows the elapsed time T during which the trailing edge of the medium passes the two fifth medium sensors 220 and the inclination that is corrected by the time the trailing edge of the medium passes both the fifth medium sensors 220. It is an example of a graph 2000 showing the relationship with ⁇ 0.
  • FIG. 20(A) the horizontal axis indicates the elapsed time T [sec] during which the rear end of the medium passes through the two fifth medium sensors 220, and the vertical axis indicates the elapsed time T [sec] during which the rear end of the medium passes through the two fifth medium sensors 220.
  • the slope ⁇ 0 [deg] that is corrected until passing 220 is shown.
  • FIG. 20(A) shows an example with the same conditions as FIG. 18(A). As shown in the graph 2000, the elapsed time T during which the trailing edge of the medium passes the two fifth medium sensors 220 and the tilt that is corrected by the time the trailing edge of the medium passes both the fifth medium sensors 220. It has a proportional relationship with ⁇ 0.
  • the medium discharge device 100 is corrected from the elapsed time T during which the trailing edge of the medium passes the two fifth medium sensors 220 until the trailing edge of the medium passes both the fifth medium sensors 220.
  • the slope ⁇ 0 can be correctly specified. Since the medium discharging device 100 can easily and accurately calculate the elapsed time T during which the rear end of the medium passes the two fifth medium sensors 220, the rear end of the medium passes both the fifth medium sensors 220.
  • the inclination ⁇ 0 corrected up to this point can be easily and accurately specified.
  • the medium discharge device 100 determines the inclination of the medium when the rear end of the medium passes both of the fifth medium sensors 220 based on the elapsed time T during which the rear end of the medium passes the two fifth medium sensors 220. ⁇ 2 can be correctly specified.
  • the medium discharge device 100 can easily and accurately calculate the elapsed time T during which the rear end of the medium passes through the two fifth medium sensors 220, it is possible to easily and accurately calculate the elapsed time T during which the rear end of the medium passes through both the fifth medium sensors 220.
  • the inclination ⁇ 2 of the medium at the time can be easily and accurately specified.
  • Z6 is between a point R4 on the center position D2 in the width direction A2 of the first ejection roller 121 on the side where the progress is delayed on the straight line E2 and the center position of the first ejection roller 121 in the medium ejection direction A1. is the distance.
  • Z5:Z6 (W4-Z7):(W3+W4-Z7) (31)
  • Z7 is the distance between the point R5 and the straight line E in the width direction A2.
  • Z7 is calculated by the following equation (32), focusing on a right triangle whose hypotenuse is a line segment connecting point R5 and original rotation center R0.
  • Z7 (Z0-L2)/tan( ⁇ 2) (32)
  • the speed ratio of the circumferential speeds of the plurality of discharge rollers is set not to a fixed value but to a variable value according to the skew amount ( ⁇ 2) of the medium.
  • the ejection roller completely eliminates the skew of the media and allows the media to be ejected well.
  • FIG. 20(B) is an example of a graph 2010 showing the relationship between the elapsed time T during which the rear end of the medium passes the two fifth medium sensors 220 and the speed ratio of the circumferential speeds of the plurality of discharge rollers. .
  • the horizontal axis indicates the elapsed time T [sec]
  • the vertical axis indicates the speed ratio of the circumferential speeds of the plurality of first discharge rollers 121 (the speed of the first discharge roller 121 on the side where the progress is delayed).
  • the ratio of the speed u1 of the first discharge roller 121 on the preceding side to u2) is shown.
  • FIG. 20(B) shows an example with the same conditions as FIG. 18(A).
  • the speed ratio is smaller than 1 and becomes smaller as the elapsed time T increases. Therefore, as the elapsed time T during which the rear end of the medium passes through the two fifth medium sensors 220 increases, the speed difference between the plurality of first discharge rollers 121 increases, and the inclination of the medium is rapidly corrected.
  • the first threshold value is calculated, for example, when the rear end of the medium is located at the center position of the ejection roller disposed on the preceding side at the time when it passes the positions of both fifth medium sensors 220. set to the elapsed time. That is, the first threshold value is set to the elapsed time T when the point R5, which is the new rotation center, is located at the center position of the first discharge roller 121 on the preceding side. In other words, the first threshold value is such that the distance Z7 in the width direction A2 between the new rotation center point R5 and the straight line E is equal to The elapsed time T is set to match the distance W4 in the width direction A2 between.
  • the medium ejecting device 100 can suppress damage to the medium due to force (load) being applied to the medium in the width direction A2.
  • the third threshold value is determined, for example, when the rear end of the medium passes through the positions of both fifth medium sensors 220, the end of the ejection roller side of the ejection roller disposed on the preceding side that is delayed in progress. It is set to the elapsed time calculated when the medium is located at the center position in the medium ejection direction A1 on the section. That is, the third threshold value is determined when the point R5, which is the new center of rotation, is located at the end of the center side of the first ejection roller 121 on the preceding side (on the side of the first ejection roller 121 on the side where progress is delayed). The elapsed time T is set for the case.
  • the third threshold value is such that the distance Z7 in the width direction A2 between the new rotation center point R5 and the straight line E is in line with the central end of the first discharge roller 121 on the preceding side in the width direction A2.
  • the elapsed time T is set to match the distance between E and E in the width direction A2. If the elapsed time is greater than the third threshold, the medium is likely to be extremely tilted. In this case, the medium ejection device 200 can more reliably suppress the occurrence of damage to the medium or notify the user of a warning by executing the abnormality process.
  • FIG. 21 shows the elapsed time T during which the trailing edge of the medium passes the two fifth medium sensors 220, and the distance between point R5 and straight line E at the time when the trailing edge of the medium passes both fifth medium sensors 220. It is an example of the graph 2100 which shows the relationship with the distance Z7 in the width direction A2.
  • FIG. 21 shows an example with the same conditions as FIG. 18(A). Further, FIG. 21 shows an example in which the width of each discharge roller is 20 [mm]. As shown in the graph 2100, the longer the elapsed time T during which the trailing edge of the medium passes the two fifth medium sensors 220, the larger the distance Z7 becomes.
  • the elapsed time T is when the distance Z7 matches the distance W4 (70 [mm]) between the center position in the width direction A2 of the first discharge roller 121 on the preceding side and the straight line E. It is 0.026 [sec].
  • the medium ejecting device 200 does not perform skew correction on the medium if the elapsed time T is greater than 0.026 [sec].
  • the elapsed time T in this case is 0.032 [sec].
  • the medium ejecting device 200 executes abnormality processing when the elapsed time T is greater than 0.032 [sec].
  • the rear end of the medium passes through one of the plurality of fifth medium sensors 220 and then passes through the other fifth medium sensor 220. Based on the elapsed time until then, it is determined whether or not to perform skew correction.
  • the medium ejecting device 200 can easily determine whether or not to perform skew correction. It is now possible to suppress an increase in processing load in media reading processing. Further, the medium ejecting device 200 has a compact housing with a straight path mechanism, and can appropriately correct the skew of the medium. In particular, the medium ejection device 200 is capable of appropriately correcting the skew of the medium even when the distance between the fifth medium sensor 220, which is disposed downstream of the imaging device 119, and the first ejection roller 121 is small. It has become possible.
  • the control unit 151 controls the speed ratio of the circumferential speeds of the plurality of ejection rollers so that the skew occurs when the medium is ejected from the plurality of ejection rollers. It is also possible to perform skew correction of the medium by setting it so that it does not occur. In this case, in step S710 of FIG. 15, the control unit 151 performs a third correction process to adjust the speed ratio of the circumferential speeds of the plurality of ejection rollers so that the skew is not eliminated when the medium is ejected from the plurality of ejection rollers. to perform media skew correction.
  • control unit 151 does not change the speed ratio of the circumferential speeds of the plurality of discharge rollers from the speed ratio in the first correction process. Instead, the control unit 151 stops correcting the skew of the medium at the timing when the skew of the medium cannot be corrected while the medium is being ejected.
  • the control unit 151 calculates a point R3 on the center position D1 in the width direction A2 of the first ejection roller 121 on the preceding side on the straight line E2 and the medium ejection direction of the first ejection roller 121 using the following equation (33). A distance Z5 from the center position of A1 is calculated (see FIG. 17).
  • the control unit 151 executes the skew correction of the medium for a period of time obtained by dividing the distance Z5 by the speed u1 of the first discharge roller 121 on the preceding side, and then stops the skew correction of the medium.
  • Z5 (W4-Z7) ⁇ tan( ⁇ 2) (33)
  • control unit 151 calculates a point R4 on the center position D2 in the width direction A2 of the first ejection roller 121 on the side where the progress is delayed on the straight line E2, and the first ejection roller 121 and the center position in the medium discharge direction A1 is calculated (see FIG. 17).
  • the control unit 151 executes the skew correction of the medium for a period of time obtained by dividing the distance Z5 by the speed u2 of the first discharge roller 121 on the side where the progress is delayed, and then stops the skew correction of the medium.
  • Z6 (W3+W4-Z7) ⁇ tan( ⁇ 2) (34)
  • the medium ejection device 100 can correct the skew of the medium as much as possible while suppressing the occurrence of wrinkles due to load on the medium, and can satisfactorily eject the medium.
  • the control unit 151 sets the speed ratio of the circumferential speeds of the plurality of ejection rollers so that the skew is eliminated when the medium is ejected from the plurality of ejection rollers. to perform media skew correction.
  • the control unit 151 sets the speed ratio of the circumferential speeds of the plurality of discharge rollers to a fixed value as described above as the second correction process.
  • the control unit 151 may set the speed ratio of the circumferential speeds of the plurality of discharge rollers to a variable value according to the elapsed time, as in the original third correction process. .
  • the medium ejecting device 200 can reliably correct the skew of the medium and eject the medium favorably.
  • the control unit 151 continues to correct the skew of the medium until the skew of the medium is resolved, and if the elapsed time is greater than the second threshold, the control unit 151 continues correcting the skew of the medium until the skew of the medium is resolved. Finish correcting the media skew before it is resolved. Thereby, the medium discharge device 200 can appropriately correct the skew of the medium while suppressing the occurrence of wrinkles in the medium.
  • control unit 151 may stop the skew correction of the medium when the elapsed time is less than or equal to the second threshold.
  • the control unit 151 considers that the skew of the medium has been sufficiently resolved, stops the first correction process, and does not perform skew correction of the medium. This prevents a load from being applied to the medium due to a change in the speed of the discharge roller during medium discharge. Therefore, the medium ejecting device 100 can suppress the occurrence of wrinkles due to load on the medium, and can efficiently eject the medium.
  • step S703 the process in step S703 is omitted, and the control unit 151 does not need to correct the skew of the medium until the trailing edge of the medium passes both of the plurality of fifth medium sensors 220.
  • FIG. 22 is a schematic diagram for explaining the state of the ejected medium when the process of step S703 is omitted.
  • FIG. 22 is a schematic diagram of a portion of the lower casing 101 in an open state, viewed from the conveyance path side.
  • a straight line E2 indicates an extension of the rear end of the medium when the rear end of the medium passes both of the fifth medium sensors 220.
  • Straight line E is set at the same position as straight line E shown in FIG.
  • the straight line E is set at the position in the width direction A2 of the rotation center R0 of the rear end of the medium when the circumferential speeds of the plurality of discharge rollers are set to have the speed ratio set in the second correction process in step S709. be done.
  • the inclination ⁇ 2 of the rear end of the medium (straight line E2) when the rear end of the medium passes both of the fifth medium sensors 220 is calculated by the following equation (35).
  • ⁇ 2 tan -1 (Z8/W2) (35)
  • W2 is the distance between the two fifth medium sensors 220.
  • Z8 indicates that the rear end of the medium passes the position of the fifth medium sensor 220 on the leading side and the position of the fifth medium sensor 220 on the side where the progress is delayed. This is the distance traveled in the medium discharge direction A1 at the position of the fifth medium sensor 220.
  • the distance Z8 is calculated by the following equation (36).
  • Z8 u2 ⁇ T (36)
  • u2 is the speed of each first discharge roller 121.
  • T is the time from when the trailing edge of the leading side passes one fifth medium sensor 220 until the trailing edge of the side that is delayed passes the other fifth medium sensor 220.
  • the distance Z0 in the medium discharge direction A1 between the fifth medium sensor 220 and the rotation center R0 is calculated by the following equation (37).
  • Z0 W6 ⁇ tan( ⁇ 2) (37)
  • W6 is the distance in the width direction A2 between the fifth medium sensor 220 on the side where the progress is delayed and the rotation center R0, and is calculated by the above equation (23).
  • the elapsed time T during which the rear end of the medium passes the two fifth medium sensors 220 is the distance in the medium discharge direction A1 between the fifth medium sensor 220 and the rotation center R0. It has a proportional relationship with Z0. Further, the distance Z0 in the medium discharge direction A1 between the fifth medium sensor 220 and the rotation center R0 is uniquely calculated from the elapsed time T during which the rear end of the preceding side passes the two fifth medium sensors 220. be done.
  • the first threshold, the second threshold, the third threshold, and the speed ratio of each first discharge roller 121 in the third correction process are the first threshold, the second threshold, and the third It is set in the same way as the threshold value and speed ratio.
  • FIG. 23 is a diagram showing a schematic configuration of a processing circuit 350 in a medium ejecting device according to another embodiment.
  • the processing circuit 350 is used instead of the processing circuit 150 of the medium ejecting device 100, and executes a medium reading process etc. instead of the processing circuit 150.
  • the processing circuit 350 includes a control circuit 351, a detection circuit 352, a determination circuit 353, a skew determination circuit 354, and the like. Note that each of these units may be configured with an independent integrated circuit, microprocessor, firmware, or the like.
  • the control circuit 351 is an example of a control section and has the same functions as the control section 151.
  • the control circuit 351 receives an operation signal from the operating device 105 or the interface device 132, a first medium signal from the first medium sensor 111, a fourth medium signal from the fourth medium sensor 116, and a fifth medium signal from the fifth medium sensor 220. Receive a signal.
  • the control circuit 351 controls the motor 131 based on each piece of information received, and also acquires an input image from the imaging device 119 and stores it in the storage device 140.
  • the control circuit 351 generates a partial image from the input image and stores it in the storage device 140, and also generates a medium image from the input image and outputs it to the interface device 132.
  • the control circuit 351 also reads out the determination result of whether the entire rear end of the medium has passed the imaging position and/or the determination result of the skew of the medium from the storage device 140, and ejects the medium based on the read determination result.
  • the motor 131 is controlled to control the roller.
  • the detection circuit 352 is an example of a detection section and has the same function as the detection section 152. Detection circuit 352 receives a second medium signal from second medium sensor 114 , a third medium signal from third medium sensor 115 , a fourth medium signal from fourth medium sensor 116 , and receives a partial image from storage device 140 . Or read the input image. The detection circuit 352 detects the amount of inclination and positional deviation of the medium from each piece of acquired information, and stores the detection results in the storage device 140.
  • the determination circuit 353 is an example of a determination unit and has the same function as the determination unit 153.
  • the determination circuit 353 receives the fifth medium signal from the fifth medium sensor 220 and reads out the detection results of the amount of inclination and positional deviation of the medium from the storage device 140.
  • the determination circuit 353 determines whether the entire trailing edge of the medium has passed through the imaging position based on each piece of acquired information, and stores the determination result in the storage device 140.
  • the skew determination circuit 354 is an example of a skew determination section, and has the same function as the skew determination section 154.
  • the skew determination circuit 354 reads the detection results of the amount of inclination and positional deviation of the medium from the storage device 140, determines whether or not skew of the medium has occurred based on the read detection results, and stores the determination result. The information is stored in the device 140.
  • the medium ejecting device is able to image the medium well and eject the medium well.

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Abstract

L'invention concerne un dispositif d'éjection de support, un procédé de commande et un programme de commande permettant d'éjecter correctement un support. Le dispositif d'éjection de support comprend : une unité de formation d'images ; une pluralité de rouleaux d'éjection disposés sur le côté aval de l'unité de formation d'images dans la direction d'éjection de support, à intervalles dans une direction perpendiculaire à la direction d'éjection de support ; une pluralité de capteurs de détection disposés entre l'unité de formation d'images et la pluralité de rouleaux d'éjection, à intervalles dans une direction perpendiculaire à la direction d'éjection de support ; et une unité de commande qui transporte un support capturé par l'unité de formation d'images au moyen de la pluralité de rouleaux d'éjection présentant des vitesses périphériques différentes les uns des autres pour exécuter une correction d'inclinaison du support. L'unité de commande exécute la correction d'inclinaison si le temps écoulé entre le passage de l'extrémité arrière du support par un capteur parmi la pluralité de capteurs de détection et le passage par un autre capteur de détection est inférieur ou égal à un premier seuil, et n'exécute pas la correction d'inclinaison si le temps écoulé est supérieur au premier seuil.
PCT/JP2022/016875 2022-03-31 2022-03-31 Dispositif d'éjection de support, procédé de commande, et programme de commande WO2023188389A1 (fr)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011071763A (ja) * 2009-09-25 2011-04-07 Canon Inc 画像処理装置、画像処理装置の制御方法及びプログラム
JP2017197320A (ja) * 2016-04-26 2017-11-02 パナソニックＩｐマネジメント株式会社 画像読取装置、斜行補正制御方法および斜行補正制御プログラム

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011071763A (ja) * 2009-09-25 2011-04-07 Canon Inc 画像処理装置、画像処理装置の制御方法及びプログラム
JP2017197320A (ja) * 2016-04-26 2017-11-02 パナソニックＩｐマネジメント株式会社 画像読取装置、斜行補正制御方法および斜行補正制御プログラム

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