JP7459596B2 - MEDIUM CONVEYING DEVICE AND IMAGE FORMING SYSTEM - Google Patents

Description

The present invention relates to a media conveying device and an image forming system.

Image forming apparatuses such as printing machines and copying machines are equipped with a medium transport device that transports a medium such as recording paper to a predetermined position.

As a technology related to a media transport device, a technology has been disclosed in which multiple analog sensors (contact sensors) are used to detect the curling tendency of the media, and the blowing position and blowing angle of the air flow that separates multiple media are changed depending on the degree of the curling tendency (Patent Document 1).

In the configuration of conventional technology that uses multiple contact sensors to detect shape abnormalities, it is necessary to provide space for arranging multiple sensors in the medium conveyance path, which reduces the degree of freedom in design. be.

The present invention has been made in consideration of the above-mentioned problems, and aims to provide a medium conveying device and an image forming device that can detect shape abnormalities of the medium with high accuracy without compromising design freedom.

In order to solve the above-mentioned problems and achieve the objects, a medium transport device that is one form of the present invention includes a storage section that stores a medium, an imaging section that images the medium stored in the storage section, and an imaging section. an analysis unit that generates measurement point information indicating the positional relationship of a plurality of measurement points set on the medium based on the imaging data acquired by the imaging data; a detection unit that detects a shape abnormality of the medium based on the measurement point information; The measurement points include a center point corresponding to the center of a first side perpendicular to the transport direction of the medium, which is a point on a side of the medium, and a center point corresponding to a center of a first side perpendicular to the conveyance direction of the medium, and a point on both ends of the first side. and an end point corresponding to one end, and the measurement point information includes a height difference between the center point and the end point .

The present invention makes it possible to detect shape abnormalities in media with high accuracy without compromising design freedom.

FIG. 1 is a perspective view that illustrates an example of an external configuration of a medium conveying device according to an embodiment. FIG. 2 is a top view schematically showing an example of the external configuration of the medium transport device according to the embodiment. FIG. 3 is a block diagram illustrating an example of a functional configuration of the ECU according to the embodiment. FIG. 4 is a perspective view illustrating an example of a state in which a normal-shaped medium is accommodated in the tray unit in the embodiment. FIG. 5 is a perspective view showing an example of a tray unit in which a medium with an abnormal shape is accommodated in the embodiment. FIG. 6 is a perspective view showing an example of a state in which parallel downward curvature has occurred in the medium according to the embodiment. FIG. 7 is a perspective view showing an example of a state in which parallel upward warping occurs in the medium according to the embodiment. FIG. 8 is a perspective view showing an example of a state in which the medium according to the embodiment has orthogonal downward curvature. FIG. 9 is a perspective view showing an example of a state in which orthogonal upward warping occurs in the medium according to the embodiment. FIG. 10 is a top view showing an example of a situation in which the orientation of the imaging device is changed when using a medium of a larger size than usual in the embodiment. FIG. 11 is a perspective view showing an example of a situation in which the imaging range of the imaging device is changed when a medium of a larger size than usual is used in the embodiment. FIG. 12 is a top view showing an example of a state in which a parallel position deviation occurs in the medium according to the embodiment. FIG. 13 is a top view showing an example of a state in which orthogonal positional deviation has occurred in the medium according to the embodiment. FIG. 14 is a flowchart illustrating an example of a processing flow when detecting a shape abnormality by the medium conveyance device according to the embodiment. FIG. 15 is a schematic diagram illustrating an example of the configuration of an image forming system according to an embodiment. FIG. 16 is a block diagram showing an example of the configuration of an image forming system according to the embodiment.

Embodiments of the present invention will be described in detail below with reference to the drawings.

<External configuration of media transport device>
FIG. 1 is a perspective view schematically showing an example of the external configuration of a medium transport device 1 according to an embodiment. FIG. 2 is a top view schematically showing an example of the external configuration of the medium transport device 1 according to the embodiment.

The medium transport device 1 includes a tray unit 11 (accommodating section), a transport unit 12, a front blower 13 (first blower), a side blower 14 (second blower), an imaging device 15 (imaging section), and an ECU. (Electronic Control Unit) 16 (control section).

The tray unit 11 is a unit that accommodates the medium 10. The medium 10 according to this embodiment is a printing paper on which an image is formed in an image forming apparatus. The tray unit 11 includes a mounting table 20, a side fence 21, an end fence 22, and a regulating plate 23 (see FIG. 2).

The loading platform 20 is a member on which a stack of media 10 is placed, and is displaced up and down by the driving force of an electric motor or the like. The side fence 21 is a member that regulates the media 10 placed on the loading platform 20 from shifting in a direction perpendicular to the transport direction 31, and is displaced by the driving force of an electric motor or the like according to the size of the media 10. The end fence 22 is a member that regulates the media 10 placed on the loading platform 20 from shifting in the opposite direction to the transport direction 31, and is displaced by the driving force of an electric motor or the like according to the size of the media 10. The regulating plate 23 is a member that regulates the media 10 placed on the loading platform 20 from shifting in the transport direction 31, and is fixed. As shown in FIG. 2, the regulating plate 23 is composed of a member divided into two, and the center of the front end side 10A (first side) of the media 10 placed on the loading platform 20 is exposed.

The transport unit 12 is a unit that transports the medium 10 in the tray unit 11 to a predetermined location. The transport unit 12 has an adsorption belt 25, a bridging roller 26, and a suction device 27.

The suction belt 25 is an endless member having a plurality of holes, and is wound around two bridging rollers 26 . At least one of the bridging rollers 26 is rotated by the driving force of an electric motor or the like. The suction device 27 is a device that generates airflow by the action of a fan or the like, and generates a pressure that causes the uppermost medium 10 placed on the mounting table 20 to be attracted to the suction belt 25 through holes formed in the suction belt 25. to occur.

The front blower 13 is installed inside a case member 29 arranged between the tray unit 11 and the transport unit 12. The front blower 13 generates front air 35 (first air flow) that travels in the opposite direction to the transport direction 31 of the media 10 in the space above the stack of media 10 placed on the mounting table 20. The front air 35 acts to lift the topmost media 10.

The side blower device 14 is installed inside both side fences 21. The side blower device 14 blows side air 36 (second air flow) that travels in a direction perpendicular to the transport direction 31 of the medium 10 on a horizontal plane into the space above the bundle of mediums 10 placed on the mounting table 20. generate. The side air 36 functions to levitate the uppermost medium 10 and to separate the uppermost medium 10 from the other media 10.

The imaging device 15 is a device that captures an image of the medium 10 placed on the mounting table 20 (contained in the tray unit 11). The imaging device 15 generates imaging data that indicates the state of the medium 10 on the mounting table 20. The imaging device 15 is installed so that the imaging range includes the front edge 10A (first edge) of the medium 10 placed on the mounting table 20 and the side edge 10B (second edge) of the medium 10 (edge perpendicular to edge 10A). The imaging device 15 according to this embodiment is installed so that the viewpoint (center of the imaging range) corresponds to the center of edge 10A, as shown in FIG. 2.

The ECU 16 is an arithmetic processing device that controls the medium conveying device 1, and is a processor including, for example, a CPU (Central Processing Unit), a RAM (Random Access Memory), a ROM (Read Only Memory), an ASIC (Application Specific Integrated Circuit), a communication I/F (Interface), etc. The ECU 16 in this embodiment performs processing to detect abnormalities in the medium 10 (shape abnormalities, position abnormalities, etc., which will be described later) based on the imaging data acquired from the imaging device 15, and processing to deal with the detected abnormalities, etc.

<Functional configuration>
FIG. 3 is a block diagram showing an example of the functional configuration of the ECU 16 according to the embodiment. The ECU 16 includes an analysis section 101, a detection section 102, and a control section 103. These functional units 101 to 103 are constructed by cooperation of programs stored in the CPU, RAM, ROM, ASIC, ROM, etc. included in the ECU 16.

The analysis unit 101 analyzes the imaging data acquired by the imaging device 15 and acquires (generates) information indicating the state of the medium 10. The analysis unit 101 according to this embodiment has a measurement point information acquisition unit 111 and a position information acquisition unit 112.

The measurement point information acquisition unit 111 acquires (generates) measurement point information indicating the positional relationship of multiple measurement points set on the medium 10 based on the imaging data. The measurement points may be, for example, points on the sides of the medium 10 (e.g., sides 10A, 10B, etc.).

The position information acquisition unit 112 acquires (generates) position information regarding the position of the medium 10 within the tray unit 11 based on the imaging data. The position information may be information indicating, for example, the positional relationship between the medium 10 placed on the placement table 20 and the side fence 21, the positional relationship between the medium 10 and the end fence 22, the positional relationship between the medium 10 and the regulating plate 23, etc.

The detection unit 102 detects an abnormality regarding the medium 10 based on the analysis result by the analysis unit 101. The detection unit 102 according to this embodiment includes a shape abnormality detection unit 121 and a position abnormality detection unit 122.

The shape abnormality detection unit 121 detects a shape abnormality of the medium 10 based on the measurement point information acquired by the measurement point information acquisition unit 111.

The positional abnormality detection unit 122 detects positional abnormalities of the medium 10 within the tray unit 11 based on the positional information acquired by the positional information acquisition unit 112.

The control unit 103 controls the medium transport device 1 based on the detection result by the detection unit 102. The control unit 103 according to this embodiment includes an air blowing control unit 131, an imaging control unit 132, and an output control unit 133.

When the shape abnormality detection unit 121 detects that the medium 10 has a shape abnormality, the air blowing control unit 131 controls either or both of the front air blowing device 13 and the side air blowing device 14 so that the air volume is different from that in normal times when no shape abnormality is detected (so that the effect of the shape abnormality is reduced).

The imaging control unit 132 adjusts the imaging range of the imaging device 15 according to the size of the medium 10 accommodated in the tray unit 11. The imaging control unit 132 changes the imaging range to include the plurality of measurement points, for example, depending on the size of the medium 10.

The output control unit 133 controls a predetermined output device such as a display or a speaker based on the detection result by the detection unit 102. The output control unit 133 performs, for example, processing for outputting images, sounds, etc. to make the user aware that a shape abnormality or positional abnormality has been detected.

<Measurement point settings>
FIG. 4 is a perspective view showing an example of a state in which a normally shaped medium 10 is accommodated in the tray unit 11 in the embodiment. In FIG. 4, three measurement points A to C are illustrated.

Measurement point A (middle point) is a point corresponding to the center of side 10A on the front end side of medium 10. Measurement point B (end point) is a point corresponding to one of the two ends of side 10A (the end closer to imaging device 15). Measurement point C (midpoint) is a point corresponding to the middle part a predetermined distance X away from measurement point B on one side 10B (the side closer to imaging device 15) of the two sides (orthogonal to side 10A) on the side of medium 10. It is preferable that the predetermined distance X is less than half the length of side 10B. The imaging range 41 of imaging device 15 is set to include these measurement points A to C.

In FIG. 4, distance L1 and distance L2 are illustrated as measurement point information indicating the positional relationship between measurement points A to C. The distance L1 is a value corresponding to the height difference between the measurement point A and the measurement point B by the imaging device 15. The distance L2 is a value corresponding to the height difference between measurement point B and measurement point C. In the example shown in FIG. 4, the distance L2 in the medium 10 having a normal shape is 0 or approximately 0.

FIG. 5 is a perspective view showing an example of a state in which the tray unit 11 accommodates the medium 10 with an abnormal shape in the embodiment. FIG. 5 exemplifies a state in which the side portions of the medium 10 have an abnormal shape (downward warpage) in which they are warped vertically downward from the center portion.

A distance L1' indicating the height difference between the measurement point A and the measurement point B when the shape is abnormal shown in FIG. 5 is larger than the distance L1 during the normal state shown in FIG. 4. Further, the distance L2' indicating the height difference between the measurement point B and the measurement point C when the shape is abnormal shown in FIG. 5 is larger than the distance L2 during the normal state shown in FIG. 4. Such fluctuations in the distances L1 and L2 occur not only when downward warpage occurs as shown in FIG. It also occurs when other shape abnormalities occur. Therefore, by monitoring changes in the distances L1 and L2, abnormalities in the shape of the medium 10 can be detected.

<Relationship between shape abnormality and airflow control>
When a shape abnormality of the medium 10 is detected, the air blowing control unit 131 controls either or both of the front air blowing device 13 and the side air blowing device 14 so that the air volume is different from normal (so as to reduce the impact of the shape abnormality).

FIG. 6 is a perspective view showing an example of a state in which parallel downward curvature has occurred in the medium 10 according to the embodiment. Parallel downward warping is a state in which the sides (side 10A and sides parallel to this) perpendicular to the conveyance direction 31 of the medium 10 are warped vertically downward from the central part. When such a shape abnormality occurs, the air blow control unit 131 increases the volume of the front air 35 from the front blower device 13 compared to the normal state when no shape abnormality occurs. As a result, the raised central portion of the medium 10 can be suppressed to bring the shape of the medium 10 closer to a normal state, and the possibility of problems occurring during conveyance of the medium 10 can be reduced.

FIG. 7 is a perspective view showing an example of a state in which parallel upward curvature has occurred in the medium 10 according to the embodiment. The parallel upward warp is a state in which the side portions of the medium 10 perpendicular to the conveyance direction 31 are warped upward in the vertical direction from the center portion. When such a shape abnormality occurs, the air blowing control unit 131 makes the air volume of the front air 35 from the front blower device 13 smaller than in a normal state when no shape abnormality occurs. Thereby, it is possible to suppress the curling up of the side portion perpendicular to the conveyance direction 31 of the medium 10, and it is possible to reduce the possibility that a problem will occur when the medium 10 is conveyed.

Figure 8 is a perspective view showing an example of a state in which orthogonal downward warping has occurred in the medium 10 according to the embodiment. Orthogonal downward warping is a state in which the sides of the medium 10 parallel to the transport direction 31 (side 10B and the sides parallel to it) are warped vertically downward from the center. When such a shape abnormality occurs, the airflow control unit 131 increases the amount of side air 36 from the side blower 14 to a larger amount than normal when no shape abnormality has occurred. This makes it possible to suppress the protruding center portion of the medium 10 and bring the shape of the medium 10 closer to a normal state, thereby reducing the possibility of malfunctions occurring when the medium 10 is transported.

FIG. 9 is a perspective view showing an example of a state in which the medium 10 according to the embodiment is warped orthogonally upward. The orthogonal upward warpage is a state in which the side portions of the medium 10 parallel to the conveyance direction 31 are warped upward in the vertical direction from the center portion. When such a shape abnormality occurs, the air blowing control unit 131 makes the air volume of the side air 36 from the side blower device 14 smaller than in a normal state when no shape abnormality occurs. Thereby, it is possible to suppress the curling up of the side portions of the medium 10 parallel to the conveyance direction 31, and it is possible to reduce the possibility that a problem will occur when the medium 10 is conveyed.

<Adjusting the imaging range>
In order to obtain measurement point information (distances L1', L2', etc.) indicating the positional relationship between the plurality of measurement points A to C, it is necessary to image the plurality of measurement points A to C using the imaging device 15. However, if the size of the medium 10 is large or if the imaging range 41 of the imaging device 15 is narrow, it may not be possible to include all the necessary measurement points A to C within the imaging range 41. In such a case, the imaging control unit 132 changes the imaging range 41 of the imaging device 15 so that a plurality of necessary measurement points A to C can be imaged.

Figure 10 is a top view showing an example of a situation in which the orientation of the imaging device 15 is changed when a medium 10 of a larger size than normal is used in the embodiment. Figure 11 is a perspective view showing an example of a situation in which the imaging range 41 of the imaging device 15 is changed when a medium 10 of a larger size than normal is used in the embodiment. The normal situation is, for example, when a medium 10 of a standard size (e.g., A4 size, etc.) is stored in the tray unit 11. The situation illustrated in Figures 10 and 11 is when a medium 10 of a larger size than the standard (e.g., A3 size, B4 size, etc.) is stored in the tray unit 11. The left side view of Figure 10 corresponds to the left side view of Figure 11, and the right side view of Figure 10 corresponds to the right side view of Figure 11.

The left side of FIG. 10 shows the orientation (position) of the imaging device 15 in normal operation, and the left side of FIG. 11 shows the imaging range 41 in normal operation. As shown in the left side of FIG. 10 and the left side of FIG. 11, the orientation of the imaging device 15 in normal operation is such that the viewpoint of the imaging device 15 (the center of the imaging range 41) coincides with measurement point A. As shown in the left side of FIG. 11, the imaging range 41 at this time includes measurement points A and B but does not include measurement point C. In such a case, the imaging control unit 132 changes the orientation of the imaging device 15 so that the viewpoint coincides with measurement point B, as shown in the right side of FIG. 10 and the right side of FIG. 11. As a result, the imaging range 41 includes all of measurement points A to C.

By adjusting the imaging range 41 of the imaging device 15 according to the size of the medium 10 as described above, imaging data including all necessary measurement points can be obtained even if the size of the medium 10 is changed.

<Detection of position anomalies>
By referring to the imaging data, not only the shape abnormality as described above, but also positional abnormality of the medium 10 within the tray unit 11 can be detected.

Figure 12 is a top view showing an example of a state in which a parallel positional deviation occurs in the medium 10 according to the embodiment. A parallel positional deviation is a state in which the medium 10 (a stack of media 10) is shifted in a direction parallel to the transport direction 31, and Figure 12 shows an example in which the medium 10 is separated from the regulating plate 23. In such a case, the position information acquisition unit 112 acquires position information including the space S1 between the front end side 10A of the medium 10 and the regulating plate 23 based on the imaging data, and the positional abnormality detection unit 122 detects the occurrence of a positional abnormality based on the space S1.

FIG. 13 is a top view showing an example of a state where orthogonal positional deviation has occurred in the medium 10 according to the embodiment. Orthogonal positional deviation is a state in which the medium 10 is shifted in a direction perpendicular to the conveyance direction 31 on a horizontal plane, and FIG. 13 illustrates a state in which the medium 10 is spaced apart from the side fence 21. In such a case, the position information acquisition unit 112 acquires position information including the distances S2 and S3 between the side side of the medium 10 (side 10B and sides parallel to this) and the side fence 21 based on the imaging data. However, the positional abnormality detection unit 122 detects the occurrence of a positional abnormality based on the intervals S2 and S3.

<Processing flow when detecting shape abnormality>
14 is a flow chart showing an example of a process flow when detecting a shape abnormality by the medium conveying device 1 according to the embodiment. When the mounting table 20 rises (S101) and stops at a predetermined position (S102), the measurement point information acquisition unit 111 measures the distances L1' and L2' (see FIG. 5) based on the imaging data acquired by the imaging device 15 (S103). The shape abnormality detection unit 121 judges whether |L1'-L1| and |L2'-L2| are equal to or less than a threshold (S104). If |L1'-L1| and |L2'-L2| are equal to or less than a threshold (S104: YES), it is judged that a shape abnormality has not occurred, and this flow ends.

If |L1'-L1| or |L2'-L2| is not below the threshold value (S104: NO), the air blow control unit 131 performs air blow control (see FIGS. 6 to 9, etc.) corresponding to the type of shape abnormality ( S105), the output control unit 133 outputs abnormality occurrence information indicating the state of the medium 10 (S106).

<Examples of using the media transport device>
15 is a schematic diagram showing an example of the configuration of an image forming system 201 according to an embodiment. The image forming system 201 includes an image forming device 211 as an image forming means for forming an image on a sheet, and a medium conveying device 1 for feeding a medium to the image forming device 211. The medium conveying device 1 is provided on a side of the image forming device 211 main body.

FIG. 16 is a block diagram showing an example of the configuration of the image forming system 201 according to the embodiment. The image forming system 201 includes a medium transport device 1, an image forming device 211, and a control device 212. The control device 212 may be built into the medium transport device 1 or the image forming device 211.

The image forming device 211 is a mechanism that forms an image on the medium 10 conveyed by the medium conveyance device 1, and may be, for example, a mechanism using an electrophotographic process, a mechanism using an inkjet method, or the like. The control device 212 may be an electronic control unit that controls the entire image forming system 201, or may be a unit that is incorporated into the medium transport device 1 and controls each mechanism of the medium transport device 1, such as a CPU. , RAM, ROM, ASIC, communication I/F, and the like.

The control by the ECU 16 as described above is realized by a program that controls the CPU. The program may be provided by being pre-installed in, for example, a ROM, an auxiliary storage device, or the like. The program may also be provided by being recorded in an installable or executable file format on a computer-readable recording medium such as a CD-ROM (Compact Disc Read Only Memory), a flexible disk (FD), a CD-R (Compact Disk-Recordable), or a DVD (Digital Versatile Disc). The program may also be provided by being stored on a computer connected to a network such as the Internet and downloaded via the network. The program may also be provided or distributed via a network such as the Internet.

According to the embodiment described above, it is possible to detect abnormalities in the shape of the medium 10 based on the imaging data acquired by the imaging device 15, and it is not necessary to arrange a plurality of contact sensors etc. to detect the shape of the medium 10. It disappears. This makes it possible to detect irregularities in the shape of the medium with high precision without sacrificing the degree of freedom in design.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and the components in the above embodiments include those that can be easily conceived by a person skilled in the art, and those that are substantially the same. , and so-called equivalent ranges. Furthermore, various omissions, substitutions, changes, and combinations of constituent elements can be made without departing from the gist of the embodiments described above.

1 medium conveying device 10 medium 10A side (first side)
Side 10B (second side)
11 Tray unit (storage section)
12 Transport unit 13 Front blower device (first blower section)
14 Side blower device (second blower section)
15 Imaging device (imaging section)
16 ECU
20 Placement table 21 Side fence 22 End fence 23 Regulating plate 25 Suction belt 26 Bridging roller 27 Suction device 29 Case member 31 Conveying direction 35 Front air (first air flow)
36 Side Air (Second Air Flow)
41 Imaging range 101 Analysis unit 102 Detection unit 103 Control unit 111 Measurement point information acquisition unit 112 Position information acquisition unit 121 Shape abnormality detection unit 122 Position abnormality detection unit 131 Air flow control unit 132 Imaging control unit 133 Output control unit 201 Image forming system 211 Image forming device 212 Control device A Measurement point (center point)
B Measurement point (end point)
C Measurement point (midpoint)

Japanese Patent Application Publication No. 2007-45630

Claims (12)

a storage section that stores the medium;
an imaging unit that captures an image of the medium accommodated in the accommodation unit;
an analysis unit that generates measurement point information indicating a positional relationship between a plurality of measurement points set on the medium based on the imaging data acquired by the imaging unit;
a detection unit that detects a shape abnormality of the medium based on the measurement point information;
Equipped with
The measurement points include a center point corresponding to the center of a first side perpendicular to the transport direction of the medium, which is a point on a side of the medium, and one end of both ends of the first side. and an end point corresponding to the part,
The measurement point information includes a height difference between the center point and the end points,
Media transport device. the measurement point further includes a midpoint on a second side parallel to a transport direction of the medium, the midpoint being a predetermined distance away from an end point corresponding to one of both ends of the second side,
The measurement point information further includes a height difference between an end point corresponding to one of both ends of the second side and the midpoint.
The media transport device of claim 1 . a blowing unit that generates an air flow so that the medium located at the uppermost position among the plurality of mediums accommodated in the storage unit floats;
an air blowing control unit that controls the air blowing unit so that when the abnormal shape is detected, the air volume is different from that when the abnormal shape is not detected;
The medium transport device according to claim 1 or 2, further comprising: a storage section that stores the medium;
an imaging unit that captures an image of the medium accommodated in the accommodation unit;
an analysis unit that generates measurement point information indicating a positional relationship between a plurality of measurement points set on the medium based on the imaging data acquired by the imaging unit;
a detection unit that detects a shape abnormality of the medium based on the measurement point information;
a blowing unit that generates an air flow so that the medium located at the uppermost position among the plurality of mediums accommodated in the storage unit floats;
an air blowing control unit that controls the air blowing unit so that when the abnormal shape is detected, the air volume is different from that when the abnormal shape is not detected;
A media transport device comprising: The measurement point is a point on a side of the medium,
The medium transport device according to claim 4 . the measurement points include a center point corresponding to a center of a first side perpendicular to a transport direction of the medium and an end point corresponding to one of both end portions of the first side,
The measurement point information includes an elevation difference between the center point and the end point.
The medium transport device of claim 5 . the blower unit includes a first blower unit that generates a first air flow along a transport direction of the medium,
the air blowing control unit controls the first air blowing unit so that the volume of the first air flow is larger than normal when the side portion of the medium perpendicular to the transport direction is warped vertically downward so as to become lower from the center toward the end portion, and controls the first air blowing unit so that the volume of the first air flow is smaller than normal when the side portion of the medium perpendicular to the transport direction is warped vertically upward so as to become higher from the center toward the end portion.
The medium transport device according to any one of claims 4 to 6 . The blowing section includes a second blowing section that generates a second air flow along a direction perpendicular to the transport direction of the medium on a horizontal plane,
The air blowing control unit controls the air volume of the second air flow when the medium is curved vertically downward such that the side portions parallel to the conveyance direction become lower from the center portion toward the end portions. The second blowing section is controlled so that the medium is larger than the normal state, and the medium is warped vertically upward so that the sides parallel to the conveyance direction become higher from the center toward the ends. In some cases, controlling the second air blower so that the air volume of the second air flow is smaller than normal;
The medium transport device according to any one of claims 4 to 7 . an imaging control unit that changes the imaging range so that the imaging range of the imaging unit includes the plurality of measurement points according to the size of the medium;
The medium transport device according to any one of claims 1 to 8 , further comprising: a light emitting unit that illuminates the medium accommodated in the accommodation unit;
The medium transport device according to any one of claims 1 to 9 , further comprising: The analysis unit generates position information regarding a position of the medium within the storage unit based on the imaging data,
The detection unit detects an abnormal position of the medium in the storage unit based on the position information.
The medium transport device according to any one of claims 1 to 10 . An image forming system that forms an image on a medium conveyed by the medium conveyance device according to any one of claims 1 to 11 .

Images