JP2017226544A - Medium suction device, image formation system and medium inspection system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a novel structure capable of inhibiting warpage of a medium in a transportation width direction in sucking the medium with a suction part.SOLUTION: A medium suction device 100 includes a first suction part 120C and a second suction part 120A that face a medium 101 to be transported and are aligned when being viewed from a transportation direction A of a medium. The medium suction device starts a suction operation of the first suction part 120C and then starts a suction operation of the second suction part 120A.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a medium suction device, an image forming system, and a medium inspection system.

In a medium suction device that sucks and supplies a medium to an image forming system such as a copying machine or a printer, or an inspection device, the uppermost medium among a plurality of media placed on the placement portion is sucked and sucked. In this state, an air adsorption method is known in which the sheet is conveyed in the conveying direction by the conveying means.
As the air suction type medium suction device, it has a plurality of suction parts arranged side by side along the medium transport direction, and the timing to operate the suction part by operating sequentially from the last suction part in the medium transport direction There has been proposed one that adjusts the pressure and sucks the medium (for example, Patent Documents 1-3).

In the configuration of Patent Document 1, the timing of sucking the medium is adjusted by operating a plurality of suction units. However, since the arrangement of the suction unit is in the medium transport direction, the medium is sucked and sucked. It is difficult to suppress the bending in the width direction that intersects the conveyance direction of the medium.
An object of the present invention is to suppress the bending of the medium in the width direction when the medium is adsorbed by the suction unit.

  The supply device according to the present invention includes a first suction unit and a second suction unit that face a medium to be transported and are arranged side by side as viewed from the medium transport direction. The second suction unit starts the suction operation after the operation is started.

  ADVANTAGE OF THE INVENTION According to this invention, the bending of the medium in the conveyance width direction at the time of adsorb | sucking a medium with a some suction part can be suppressed.

The figure which shows typically the structure of the medium suction apparatus which concerns on embodiment of this invention. The figure explaining arrangement | positioning of the suction part with which a medium suction apparatus is provided. The figure explaining arrangement | positioning and a structure of a suction part. The figure explaining another form of a suction part. The figure explaining the structure of the conventional medium suction apparatus. The figure explaining the structure of the conventional medium suction apparatus. The figure explaining operation | movement of the conventional medium suction apparatus. The figure explaining the structure of the 1st Embodiment of this invention. The figure explaining operation | movement of the 1st Embodiment of this invention. The figure explaining operation | movement of the 1st Embodiment of this invention. The figure explaining operation | movement of the 1st Embodiment of this invention. The figure explaining the bending of the conveyance direction which generate | occur | produces in a medium. The figure explaining the bending of the width direction which generate | occur | produces in a medium. The figure explaining the structure of the 2nd Embodiment of this invention. The figure explaining operation | movement of the 2nd Embodiment of this invention. The figure explaining operation | movement of the 2nd Embodiment of this invention. The figure explaining operation | movement of the 2nd Embodiment of this invention. The figure explaining the structure of the modification of the 2nd Embodiment of this invention. The figure explaining operation | movement of the modification of the 2nd Embodiment of this invention. The figure explaining operation | movement of the modification of the 2nd Embodiment of this invention. The block diagram which shows the structure of the control system of the medium suction apparatus which concerns on this invention. The flowchart which shows the control content which concerns on the 3rd Embodiment of this invention. The block diagram which shows the structure of the control system which concerns on the 4th Embodiment of this invention. The flowchart which shows the control content which concerns on the 4th Embodiment of this invention. The perspective view explaining another form of a suction part. The figure explaining operation | movement of the attraction | suction part shown in FIG. 1 is a diagram schematically showing an embodiment of an image forming system according to the present invention. The figure which shows typically one form of the medium test | inspection system which concerns on this invention. The figure which shows typically one form of the medium test | inspection system which concerns on this invention. The figure which shows typically one form of the medium test | inspection system which concerns on this invention. The figure explaining another form of arrangement | positioning of a suction part. The figure explaining another form of arrangement | positioning of a suction part.

Hereinafter, embodiments according to the present invention will be described with reference to the drawings. In the embodiment, components having the same functions and configurations are denoted by the same reference numerals, and redundant description is omitted as appropriate. The drawings may be partially omitted to facilitate understanding of some configurations.
In the air suction type medium suction device, the suction part starts sucking from the state where there is a gap between the suction surface and the top surface of the medium, and sucks the medium. When a part of the medium (for example, both end sides) is first sucked, the portion sucked later (the portion between the first sucked portion) may bend.
Therefore, in the medium suction device according to the present embodiment, a plurality of suction units are arranged in the transport width direction intersecting with the medium transport direction, and suction is started from the center portion in the transport width direction, thereby attracting from the center portion of the medium. It is adsorbed on the surface, and the both end portions which are the end portions in the conveyance width direction are not adsorbed first, and the occurrence of bending is suppressed. That is, after having the first suction part and the second suction part facing the medium to be transported and arranged side by side as viewed from the transport direction of the medium, and after the first suction part starts the suction operation, The second suction unit started the suction operation. For this reason, in the medium suction device using the air feeding method, it is possible to suppress bending in the transport vertical direction, which is the transport width direction when the medium is adsorbed.

(First embodiment)
A configuration of the medium suction device 100 according to the present embodiment will be described.
As shown in FIG. 1, the medium suction device 100 includes a placement unit 110 on which a sheet-like medium 101 is stacked, a plurality of suction units 120A, 120B, and 120C, a transport unit 130, and a blower unit as a separation unit. 150 is provided in the housing.
The loading unit 110 is for loading a plurality of media 101 and includes a lifting tray 111 that is lifted and lowered by a lifting mechanism in accordance with the number of stacked sheets (remaining amount).
The transport unit 130 transports the medium 101 in the medium transport direction indicated by the arrow A, and transports the medium 101 to another system positioned in the transport direction A. The conveying unit 130 includes a conveying belt 131 that adsorbs and conveys the medium 101 by a suction force that is a negative pressure generated by the suction units 120 </ b> A, 120 </ b> B, and 120 </ b> C, and a belt driving motor as a belt driving source that rotates the conveying belt 131. 132 and the like. A large number of small-diameter holes are formed in the conveyor belt 131 so that the air flow AW generated by the suction portions 120A, 120B, and 120C can pass therethrough. The conveyor belt 131 is stretched and supported by at least two rollers 133 and 134, and one of the rollers is rotationally driven by the belt drive motor 132, so that the conveyor belt 131 rotates in the clockwise direction in FIG. In this embodiment, the roller 133 is rotationally driven by the belt drive motor 132.
The transport unit 130 sucks the uppermost medium 101 sucked upward by the suction units 120A, 120B, and 120C by the suction surface 131A of the transport belt 131 facing the medium 101, and the belt driving motor 132 is driven. Thus, the medium 101 adsorbed on the adsorption surface 131A is conveyed in the conveyance direction A while being adsorbed.

As shown in FIG. 1, the air blower 150 is configured so that the medium 101 on the end side of the object to be conveyed is aligned with the timing at which the uppermost medium 101 in the placement unit 110 is sucked by the suction units 120A, 120B, and 120C. The air flow FW that is the separation air is blown out to the front end portion 101d in the medium conveying direction (hereinafter referred to as “front end portion”). The air blowing unit 150 blows an air flow FW toward the tip 101d of the uppermost transported object 101, so that the airflow FW is placed between the uppermost transported object 101 and the medium 101 positioned below the uppermost transported object 101. Is caused to float toward the conveying means 130.
As shown in FIG. 1, the air blowing unit 150 includes a blower fan 151 that is rotationally driven by a fan drive motor 155 as a drive unit, a blower duct 152 that communicates with the blower fan 151 at one end, and communicates with the other end of the blower duct 152. The blower nozzle 153 and the like are provided. The blower unit 150 takes in the outside air from the opening of the blower fan 151 and is ejected from the blower nozzle 153 as the airflow FW through the blower duct 152 when the blower fan 151 is rotationally driven. Then, the air flow FW is blown toward the top end 101d of the uppermost medium 101 (and the medium 101 overlapping thereunder), so that the uppermost medium 101 is moved downward by the positive pressure of the air flow FW. Will be lifted up. The suction parts 120A, 120B, and 120C are arranged above the tip 101d side of the transported object 101, and suction by the suction parts 120A, 120B, and 120C is performed, so that the uppermost transported object 101 is transported. Adsorption is promoted toward the adsorption surface 131 </ b> A of the 130 conveyance belts 131.

  As shown in FIG. 1, the blower unit 150 is provided with an electric shutter mechanism 156 that opens and closes the blower duct 152 or the blower nozzle 153. The shutter mechanism 156 is opened and closed by a fan shutter drive unit 172. The air blowing unit 150 is configured such that the air flow FW is blown out from the air blowing nozzle 153 when the fan shutter driving unit 172 is turned on / off while the fan driving motor 155 is in an operating state. Of course, the air flow FW may be blown toward the front end 101d of the medium 101 by turning on / off the fan drive motor 155 without providing the shutter mechanism 156 and the fan shutter drive unit 172. In this case, there is a time lag until the blower fan 151 starts rotating and the air flow rate necessary for separating the medium 101 is generated. For this reason, it is preferable to adjust the timing at which the air flow FW is blown by opening and closing the shutter mechanism 156 by the fan shutter driving unit 172.

The suction units 120A, 120B, and 120C are arranged close to each other in the width direction W that intersects the transport direction A, as shown in FIG. 2 above the medium 101 stacked on the placement unit 110. The width direction W is also the conveyance width direction. The suction units 120A to 120C have the same configuration, and as shown in FIG. 3, suction chambers 121A, 121B, 121C, suction ducts 122A, 122B, 122C, suction blades 123A, 123B, which serve as chambers through which a gas such as air passes, 123C, suction driving means 124A to 124C as negative pressure generating means for making the chamber part negative pressure are provided. The suction units 120A to 120C operate the suction driving means 124A to 124C to rotate the suction blades 123A, 123B, and 123C, thereby generating a negative pressure in the suction chambers 121A to 121C (hereinafter referred to as “chamber method”). ”). The suction units 120A to 120C suck the uppermost medium 101 of the stacked medium 101 with a negative pressure that generates a negative pressure in the suction chambers 121A to 121C.
As shown in FIG. 1, the suction chambers 121 to 121 </ b> C are installed inside the conveyance unit 130, and an opening formed at the bottom of the suction chambers 121 </ b> C to 121 </ b> C is a lower space through a large number of small-diameter holes formed in the conveyance belt 131. It is formed so as to communicate with. The suction chambers 121A to 121C are connected to suction blades 123A to 123C and suction drive means 124A to 124C via ducts 122A to 122C.

In the suction units 120A to 120C, the suction blades 123A to 123C are rotated by the suction drive units 124A to 124C, thereby sucking air from below the transport unit 130 and sucking the sucked air into the suction chambers 121A to 121C and the suction duct 122A. To 122C, suction blades 123A to 123C, and suction drive means 124A to 124C are discharged to the outside of the suction units 120A to 120C. As the negative pressure generating means, a compressor or the like may be used instead of the combination of the suction blades 123A to 123C and the suction driving means 124A to 124C.
The suction units 120A to 120C are provided with electric shutter mechanisms 126A, 126B, and 126C as control valves that adjust the negative pressure by opening and closing the suction ducts 122A to 122C or the suction chambers 121A to 121C. The shutter mechanisms 126A, 126B, and 126C are opened and closed by shutter driving units 127A, 127B, and 127C. In the suction units 120A to 120C, the suction force by the air flow AW acts on the medium 101 when the shutter drive units 127A to 127C are operated in the opening direction while the suction drive units 124A to 124C are in the operating state. That is, in the present embodiment, the shutter mechanisms 126A to 126C arranged in the suction ducts 122A to 122C connected to the suction chambers 121A to 121C and the suction blades 123A to 123C reduce the area of both the suction ducts 122A to 122C. Even if the suction driving means 124A to 124C are always operating, the pressure in the suction chambers 121A to 121C can be adjusted by adjusting the shutter mechanisms 126A to 126C. Yes. That is, the shutter mechanisms 126A, 126B, and 126C function as control valves that open and close the suction ducts 122A to 122C so as to adjust the negative pressure inside the suction chambers 121A to 121C.

  As the configuration of each suction unit, a suction force may be applied to the medium 101 by turning on / off the suction drive units 124A to 124C without providing the shutter mechanisms 126A to 126C and the shutter drive units 127A to 127C. In this case, there is a time lag until the suction force (negative pressure) for sucking the medium 101 is generated after the suction blades 123A to 123C start rotating. Therefore, it is preferable to adjust the timing at which the suction force is applied by turning on / off the shutter mechanisms 126A to 126C by the shutter driving units 127A to 127C while the suction driving units 124A to 124C are driven in order to cope with high speed.

  The suction units 120A to 120C are not limited to those shown in FIG. For example, the suction part 120D shown in FIG. 4 has a configuration without the suction ducts 122A to 122C with respect to the suction parts 120A to 120C shown in FIG. In the case of this suction part 120D, the suction blades 123A to 123C are rotated by the suction drive means 124A to 124C, whereby air is sucked from below the suction blades 123A to 124C in FIG. 4 and discharged upward in FIG. A negative pressure can be generated in the suction chambers 121 </ b> A to 121 </ b> C to suck the medium 101.

Here, a conventional configuration will be described. In the conventional configuration, as described in Patent Document 1, a plurality of suction portions arranged side by side in the transport direction A, and a plurality of suction units in the width direction W as shown in FIGS. 5A, 5B, and 5C. There is one in which the suction unit 120 is arranged side by side. The mechanical configuration of the suction unit 120 is the same as the configuration of the suction units 120A to 120C. As the operation of the suction unit 120, one suction unit 120 is released by one control valve, or shutter mechanisms 126A to 126C which are a plurality of control valves of the plurality of suction units 120 as shown in FIGS. 5A, 5B, and 5C. At the same time, the medium 101 is sucked up to the suction surface 131A of the transport belt 131.
In such a configuration, the orientation of the medium 101 is not determined, and the end portions (both ends) 101a and 101b on the both sides of the conveyed object 101 positioned in the width direction W may be first attracted to the attracting surface 131A. In this case, the central portion 101c of the medium 101 is bent. The occurrence of such bending not only causes wrinkles, but also can cause jamming on the conveyance guide during conveyance.

Therefore, in the suction units 120A, 120B, and 120C according to the present embodiment, the order of operation in the width direction W of the suction unit is defined to suppress the generation of wrinkles due to the occurrence of bending. That is, as shown in FIGS. 6A, 6B, 6C, and 6D, the plurality of suction portions 120A, 120B, and 120C according to the present embodiment include shutter mechanisms 126A, 126B, and 126C that can operate independently. ing. For this reason, as shown in FIG. 6A, after the suction driving means 124A to 124C are operated and the suction blades 123A to 123C are rotated, first, as shown in FIG. The suction mechanism 122C of the suction part 120C located above the central part 101c located between 101a and 101b is operated to release the suction duct 122C and start the suction to the central part 101c. Then, only the central portion 101c of the conveyed object 101 is first sucked to the suction surface 131A, and the end portions 101a and 101b on both sides are not sucked. Thereafter, as shown in FIGS. 6C and 6D, the suction mechanisms 122A and 126B of the suction portions 120A and 120B located above the end portions 101a and 101b on both sides are operated to release the suction ducts 122A and 122B. Adsorption to the end portions 101a and 101b of the first is started. Then, since the center portion 101c has already been sucked, the medium 101 is gradually sucked from the center portion 101c toward the end portions 101a and 101b.
In this way, since the end portions 101a and 101b on both sides of the medium 101 are simultaneously sucked by being sucked from the central portion 101c, the occurrence of bending is suppressed, and the suction surface 131A of the transport belt 131 is free from wrinkles. Can be adsorbed. In this embodiment, the description has been made on the assumption that there are three units of the suction unit. However, even when there are four or more units, the suction is gradually performed from the central portion 101c of the medium 101 toward the end portions 101a and 101b on both sides. Thus, the bending of the medium 101 in the width direction W can be suppressed and suction can be performed without wrinkles.

  In the present embodiment, the suction part 120C corresponds to the first suction part, the suction part 120A corresponds to the second suction part, and the suction part 120B corresponds to the third suction part. When viewed from the conveyance direction A (that is, from the viewpoint of FIG. 6), the suction unit 120B (third suction unit) has a suction unit 120A (second suction unit) with respect to the suction unit 120C (first suction unit). Part) and arranged side by side.

  When sucking a sheet, which is one of the sheet-like media 101, a suction operation is started from the suction unit 120C (first suction unit), and the suction unit 120A (second suction unit) and the suction unit 120B (third suction unit). At the same time start the suction operation.

  Note that the suction unit 120A (second suction unit) and the suction unit 120B (third suction unit) may not start at the same time, and the suction unit 120A (second suction unit) performs the suction operation. After that, the suction unit 120B (third suction unit) may start the suction operation.

  It should be noted that when the paper (sheet-like medium 101) is conveyed, the bending that occurs in the paper (sheet-like medium 101) extends in the conveying direction A as shown in FIG. 7A (deflection A1), and FIG. As shown in FIG. 2, the main part is broadly divided into ones (bending W1) extending in a direction (width direction W) orthogonal to the conveyance direction A.

  The bending W1 extending in the direction (paper width direction W) perpendicular to the conveyance direction A shown in FIG. 7B occurs substantially parallel to the rotation axis of the conveyance roller 133 (or the conveyance belt). Therefore, for example, the deflection W1 can be extended by controlling the drive timings of the plurality of transport rollers, so that even if the deflection W1 occurs, it can be removed to some extent.

  On the other hand, since the deflection A1 extending in the transport direction A shown in FIG. 7A is orthogonal to the rotation axis of the transport roller 133, it is extremely difficult to stretch the bend a during the transport. Then, the paper (medium 101) having the deflection A1 is pressed by the transport roller 133 or the transport belt, thereby causing wrinkles and causing a jam or the like.

  An object of the present invention is to suppress the bending A1 (that is, the bending that is difficult to remove in a post process). In the present invention, the suction means is arranged in the direction orthogonal to the conveyance direction of the paper (medium 101) (that is, the paper width direction W), thereby suppressing the occurrence of the bending A1.

  In Patent Document 1, the suction unit is arranged in the sheet conveyance direction A and the sheet is sucked by the suction unit. However, since the start order of the suction unit in the sheet width direction W is not controlled, the bending a is suppressed. Can not do it.

  On the other hand, since the suction means of the present application are arranged in the width direction W of the paper (medium 101) and the start order of the suction means in the width direction W is controlled, the deflection A1 can be suppressed.

  In Patent Document 1, the suction range of the suction means is long in the longitudinal direction of the paper. When the suction range is long, there are many “bending margins” of the paper, and there is also concern about uneven suction of the suction means, so that the bending is likely to occur.

  On the other hand, since the suction means of the present application are arranged in the width direction W of the paper (that is, the short direction of the paper), there is little “bending margin” of the paper (medium 101), and the suction unevenness of the suction means is also small. It is difficult for bending to occur.

(Second Embodiment)
In the first embodiment, suction by the suction unit 120C positioned above the central portion 101c of the medium 101 is first performed, and then the suction portions 120A and 120B positioned above both ends 101a and 101b of the medium 101. By carrying out the adsorption by means of, the bending in the width direction W was suppressed and the generation of wrinkles was prevented. On the other hand, in the present embodiment, as shown in FIGS. 8A, 8B, 8C, and 8D, the suction portions 120A, 120B, from the end portion 101a to the end portion 101b, or from the end portion 101b to the end portion 101a, 120C is operated.
In the present embodiment, the description of the operation order of the suction unit is continued as the suction units 120A, 120C, and 120B. The operation of the suction units 120A, 120B, and 120C here refers to the shutter mechanisms 126A, 126B, and 126C that are control valves after the suction driving means 124A to 124C are driven to rotate the suction blades 123A to 123C, respectively. That is, the shutter driving units 127A, 127B, and 127C are operated so as to move in a direction (opening direction) in which the suction ducts 122A, 122B, and 122C are released.

That is, as shown in FIG. 8A, after the suction driving means 124A to 124C are driven and the suction blades 123A to 123C are rotated, the shutter driving unit 127A is operated to operate the shutter mechanism as shown in FIG. 8B. The suction duct 122A is released by 126A and the suction to the end portion 101a is started. Then, the medium 101 is in a state where only one end portion 101a is adsorbed, and thereafter, as shown in FIGS. 8C and 8D, the shutter drive units 127C and 127B gradually move from the end portion 101a toward the other end portion 101b. And the suction ducts 122C and 122B are released by the shutter mechanisms 126C and 126B to start the suction. Then, since the suction of the one end 101a to the suction surface 131A has already been completed, the medium 101 is gradually suctioned from the one end 101a toward the other end 101b to the suction surface 131A. .
In this manner, the end portions 101a and 101b on both sides of the medium 101 are simultaneously adsorbed and bent by being adsorbed from one end portion 101a of the medium 101 positioned in the width direction W toward the other end portion 101b. Can be suppressed, and the medium 101 can be adsorbed without wrinkles.

  In the present embodiment, the suction part 120A corresponds to the first suction part, the suction part 120C corresponds to the second suction part, and the suction part 120B corresponds to the third suction part. Then, when viewed from the transport direction A (that is, from the viewpoint of FIGS. 8A to 8D), the suction unit 120B (third suction unit) has a suction unit 120A (second suction unit) with respect to the suction unit 120C (second suction unit). 1 suction part) and arranged on the opposite side.

  When suctioning the medium 101 such as paper, the suction operation is started from the suction unit 120A (first suction unit), and then the suction unit 120C (second suction unit) starts the suction operation, and then the suction unit 120B ( The third suction unit) starts the suction operation.

  In the second embodiment, an example has been described in which three suction units 120A, 120B, and 120C are linearly arranged in the transport width direction W as the suction unit, but as shown in FIGS. 9A, 9B, and 9C. In addition, for example, two suction units 120A and 120B may be used. In this case, after the suction driving means 124A and 124B are driven in FIG. 9A and the suction blades 123A and 123B are rotated, the shutter driving unit 127A is operated and suction is performed by the shutter mechanism 126A as shown in FIG. 9B. The duct 122A is released and the suction to the end portion 101a is started. Then, for example, after a predetermined time has elapsed, as shown in FIG. 9C, the shutter drive unit 127B is operated to release the suction duct 122B by the shutter mechanism 126B, and the suction to the end portion 101b is started. Here, “after a predetermined time has elapsed” means that at least the time until the end portion 101a is attracted to the suction surface 131A, more preferably, about 1/3 to 1/2 of the conveyance width direction W of the medium 101 is on the suction surface 131A. It is after a lapse of time until it is conveyed. The predetermined time is obtained in advance by experiments or the like, the time from when the shutter drive unit 127A is operated is measured by, for example, a timer, and the measurement result is compared with the predetermined time by, for example, the control unit, etc. This can be realized by controlling the operation timing of 127B.

  According to such a configuration, the both sides of the medium 101 are attracted to the suction surface of the transport belt 131 from one end 101a of the medium 101 positioned in the transport width direction W toward the other end 101b. It is possible to prevent the end portions 101a and 101b from being simultaneously sucked and bend, and the medium 101 can be sucked without wrinkles.

  In an embodiment with two such suction units, the suction unit 120A corresponds to the first suction unit, and the suction unit 120B corresponds to the second suction unit. When viewed from the transport direction A (that is, from the viewpoint of FIG. 7), the suction unit 120A (first suction unit) and the suction unit 120B (second suction unit) are arranged side by side.

  When the sheet is sucked, the suction operation starts from the suction unit 120A (first suction unit), and then the suction unit 120B (second suction unit) starts the suction operation.

(Third embodiment)
In the present embodiment, the operation timing of the plurality of suction units 120 </ b> A, 120 </ b> B, and 120 </ b> C is controlled using the control unit 200 according to the type of the medium 101. In the present embodiment, the type of the medium 101 is the thickness X of the medium 101, and the basis weight (g / m 2) of the medium 101 is used as a guide here.
Here, the contents of the third embodiment and the configuration of the control unit 200 of the medium suction device 100 will be described. Note that the control unit 200 is not applied only to the third embodiment, and can also be used in other embodiments to control the operation of each suction unit.

  In the present embodiment, the control unit 200 controls the operation timings of the plurality of suction units 120A, 120B, and 120C according to the thickness X of the medium 101. Specifically, when the thickness X of the medium 101 is a predetermined value X1 or more (predetermined value or more), the control unit 200 performs a plurality of suction operations more than when the thickness X of the medium 101 is less than the predetermined value X1. Control is performed so that the difference in the operation timing of the parts becomes small. That is, as the suction part, the suction parts 120A, 120B, and 120C similar to those in the first embodiment are used. As in the first embodiment, the suction part 120C is operated first, and then the suction parts 120A and 120B are turned on. Let us assume the case of simultaneous operation. In this case, the order of the suction unit 120C that operates first and the suction units 120A and 120B that operate after that are the same regardless of the thickness X of the medium 101 in the first embodiment. However, in this embodiment, when the time from the suction unit 120C to the operation of the suction units 120A and 120B is the operation interval time, the operation interval time is configured to change according to the thickness X of the medium 101. Yes. Hereinafter, the contents of this control will be described mainly with reference to FIGS.

FIG. 10 is a block diagram showing the configuration of the control system of the medium suction device 100 according to the present invention, and FIG. 11 is a flowchart showing the control contents according to the third embodiment.
In FIG. 10, the control unit 200 includes a computer including a CPU 201, a RAM 202, a ROM 203, and a timer 204. An operation panel 160 configured with a touch panel as an input unit for inputting various information and a thickness detection sensor 161 for detecting the thickness X of the conveyed object 101 are connected to the input side of the control unit 200 via signal lines. Has been. On the operation panel 160, a thickness information input unit 162 for inputting information on the thickness X and a thickness selection unit 163 for selecting the thickness X of the medium 101 are displayed as switches. In this embodiment, the information on the thickness X of the medium 101 is selected by the thickness X information detected by the thickness detection sensor 161, the thickness X information input from the thickness information input unit 162, and the thickness selection unit 163. Thickness X information can be used. The thickness detection sensor 161, the thickness information input unit 162, and the thickness selection unit 163 may be any one and may not be all provided.

  At the output side of the control unit 200, suction drive units 124A to 124C, shutter drive units 127A to 127C, a belt drive motor 132, a fan drive motor 155, and a fan shutter drive unit 172 are connected via signal lines. The operations of the suction drive means 124A to 124C, the shutter drive units 127A to 127C, the belt drive motor 132, the fan drive motor 155, and the fan shutter drive unit 172 are turned on / off according to the operation timing stored in the ROM 203 of the control unit 200. Be controlled. The ROM 203 of the control unit 200 stores a predetermined value X1 for determining the thickness X in advance. This predetermined value X1 may be arbitrarily changed. In the ROM 203 of the control unit 200, times Ta and Tb are stored in advance as operation interval times. Times Ta and Tb are set such that Ta> Tb.

FIG. 11 shows a flowchart of control of the suction units 120A, 120B, and 120C by the control unit 200 of the medium suction device 100 according to the third embodiment. In the present embodiment, the description will be continued assuming that the suction driving means 124A to 124C are already operating.
In step ST1, the control unit 200 acquires the thickness X information (basis weight) of the medium 101 from the thickness detection sensor 161, the thickness information input unit 162, or the thickness selection unit 163, and proceeds to step ST2.
In step ST2, the control unit 200 compares the thickness X with a predetermined value X1 (for example, basis weight 70 g / m2), and determines whether or not the thickness X of the medium 101 is greater than or equal to the predetermined value X1. Of course, it is not essential to convert the thickness X into the basis weight. When the thickness X of the medium 101 is equal to or greater than the predetermined value X1, the control unit 200 proceeds to step ST3, starts the suction operation by the suction unit 120C disposed at the center, and proceeds to step ST4. In step ST3, the shutter drive unit 127C is operated, the suction duct 122C is released by the shutter mechanism 126C, and the suction operation to the central portion 101c of the medium 101 is performed.
In step ST4, the control unit 200 measures the elapsed time T after the operation of the shutter drive unit 127C by the timer 204. When the elapsed time T becomes the time Tb in step ST5, the control unit 200 proceeds to step ST6. In step ST6, the control unit 200 operates the shutter driving units 127A and 127B to release the suction ducts 122A and 122B by the shutter mechanisms 126A and 126B, and the end portions 101a and 101b by the suction units 120A and 120B located at the ends. The suction operation is started and the process proceeds to step ST11.

On the other hand, when the thickness X of the medium 101 is not greater than or equal to the predetermined value X1 (less than the predetermined value) in step ST2, the control unit 200 proceeds to step ST7 and performs an adsorption operation by the suction unit 120C disposed in the center portion. Start and proceed to step ST8. In step ST7, the shutter drive unit 127C is operated, the suction duct 122C is released by the shutter mechanism 126C, and the suction operation to the central portion 101c of the medium 101 is performed.
In step ST8, the control unit 200 measures the elapsed time T after the operation of the shutter drive unit 127C by the timer 204. When the elapsed time T becomes the time Ta in step ST9, the control unit 200 proceeds to step ST10. In step ST10, the control unit 200 operates the shutter driving units 127A and 127B to release the suction ducts 122A and 122B by the shutter mechanisms 126A and 126B, and the suction units 120A and 120B located at the end portions with respect to the end portions 101a and 101b. The suction operation is started and the process proceeds to step ST11.
When the thickness X of the medium 101 is less than the predetermined size X1, the control unit 200 determines the operation timing of the suction unit 120C and the suction units 120A and 120B as compared with the case where the thickness X of the medium 101 is equal to or larger than the predetermined size X1. Control to increase the difference. In this embodiment, (0 [msec] ≦ Tb <Ta). When Tb is set to 0 second, the suction ducts 122A to 122C are simultaneously released by all the shutter mechanisms 126A to 126C of the suction units 120A to 120C.
In other words, when the thickness X of the medium 101 is greater than or equal to the predetermined value X1, the control unit 200 causes the suction unit 120C and the suction unit 120A to be more than when the thickness X of the medium 100 is less than the predetermined value X1. , 120B is controlled so as to reduce the difference in operation timing.
The basis weight 70 g / m2 described as the predetermined value X1 of the thickness X of the medium 101 is an example, and is not limited to this basis weight.

  In step ST11, the control unit 200 determines completion of suction of the medium 101 on the suction surface 131A of the transport belt 131 from, for example, an elapsed time since the operation of the sensor or shutter mechanisms 126A and 126B, and then transports in step ST12. The belt drive motor 132 of the means 130 is operated to start the belt conveyance of the medium 101 by the conveyance belt 131, and this control is finished.

  As described above, the thickness X of the medium 101 is acquired, and the operation timing of the transport unit 120C and the suction units 120A and 120B (shutter mechanisms 126A and 126B) is changed according to the acquired thickness X information (basis weight). Thus, the optimum suction operation according to the thickness X of the medium 101 is obtained. That is, when the medium 101 is made of a low-strength material such as thin paper, bending in the width direction W is likely to occur. Therefore, the time difference between the suction unit 120C to be operated first and the suction units 120A and 120B to be operated thereafter is bent. Generation of wrinkles due to bending can be suppressed by providing an interval to the extent that generation of the wrinkles can be suppressed.

  On the other hand, when the medium 101 is a strong material such as thick paper, since the bending in the width direction W is difficult to occur, the time difference between the suction unit 120C to be operated first and the suction units 120A and 120B to be operated thereafter is It can be made shorter than in the case of thin paper. In some cases, the plurality of suction units 120A to 120C may be operated simultaneously. If the operation time of the suction unit is shortened in this way, the time from when the medium 101 is quickly lifted to the suction surface 131A of the transport belt 131 and sucked and started to be transported can be shortened compared to the case of thin paper. This is advantageous in terms of productivity. That is, since the thick medium 101 is stiff, it is difficult for bending to occur, and priority can be given to suction force and productivity. Therefore, suction may be started by simultaneously operating the suction units 120A to 120C.

  That is, the control unit 200 starts the suction operation of the plurality of suction units (120A, 120B, 120C) when the thickness of the medium 101 is less than the predetermined value, compared to when the thickness of the medium 101 is equal to or greater than the predetermined value. Control to increase the time interval. Thereby, generation | occurrence | production of a wrinkle can be suppressed.

  Note that the control unit 200 may acquire the basis weight information directly without acquiring the thickness X of the medium 101, and control each suction unit. That is, the control unit 200 starts the suction operations of the plurality of suction units (120A, 120B, 120C) when the basis weight of the medium 101 is less than the predetermined value, compared to when the basis weight of the medium 101 is equal to or greater than the predetermined value. Control to increase the time interval. Thereby, generation | occurrence | production of a wrinkle can be suppressed.

(Fourth embodiment)
In the present embodiment, the operation timing of the plurality of suction units 120 </ b> A, 120 </ b> B, 120 is controlled using the control unit 200 according to the size of the medium 101. In the present embodiment, the size of the conveyed object 101 is, for example, a size based on the JIS standard.
On the input side of the control unit 200A according to the present embodiment, as shown in FIG. 12, an operation panel 160 and a size detection sensor 165 that detects the size of the medium 101 instead of the thickness detection sensor 161 are connected via signal lines. It is connected. On the operation panel 160, a size information input unit 166 for inputting size S information and a size selection unit 167 for selecting the size S of the medium 101 are displayed as switches. In the present embodiment, the size S information of the medium 101 includes the size S information detected by the size detection sensor 165, the size S information input from the size information input unit 166, and the size S information selected by the size selection unit 167. Can be used. Any one of the size detection sensor 165, the size information input unit 166, and the size selection unit 167 may be provided, and not all of them may be provided.

  At the output side of the control unit 200A, suction driving means 124A to 124C, shutter driving units 127A to 127C, a belt driving motor 132, a fan driving motor 155, and a fan shutter driving unit 172 are connected via signal lines. The operations of these suction drive means 124A to 124C, shutter drive units 127A to 127C, belt drive motor 132, fan drive motor 155, and fan shutter drive unit 172 are turned on / off according to the operation timing stored in the ROM 203 of the control unit 200A. Be controlled. The ROM 203 of the control unit 200 stores a predetermined size S1 for determining the size S in advance. The predetermined size S1 may be arbitrarily changed. In the ROM 203 of the control unit 200A, times Tc and Td are stored in advance as operation interval times. Times Tc and Td are set as Tc <Td.

FIG. 13 is a flowchart illustrating the control content of the suction units 120A, 120B, and 120C by the control unit 200A of the medium suction device 100 according to the fourth embodiment. In the present embodiment, the description will be continued assuming that the suction driving means 124A to 124C are already operating.
In step ST21, the control unit 200A acquires the size S information of the medium 101 from the size detection sensor 165, the size information input unit 166, or the size selection unit 167, and proceeds to step ST22.
In step ST22, the control unit 200A compares the size S with the predetermined size S1, and determines whether the size S of the medium 101 is equal to or larger than the predetermined size S1. When the size S of the medium 101 is equal to or larger than the predetermined size S1, the control unit 200A proceeds to step ST23, starts the suction operation by the suction unit 120C disposed at the center, and proceeds to step ST24. In step ST23, the shutter driving unit 127C is operated, the suction duct 122C is released by the shutter mechanism 126C, and the suction of the medium 101 to the central portion 101c is started.
In step ST24, the control unit 200A measures the elapsed time T after the operation of the shutter driving unit 127C by the timer 204. When the elapsed time T becomes the time Td in step ST25, the control unit 200A proceeds to step ST26. In step ST26, the control unit 200A operates the shutter driving units 127A and 127B to release the suction ducts 122A and 122B by the shutter mechanisms 126A and 126B, and the end portions 101a and 101b by the suction units 120A and 120B located at the end portions. Adsorption is started and the process proceeds to step ST31.

On the other hand, if the size S of the medium 101 is not equal to or larger than the predetermined size S1 (more than the predetermined size) (less than the predetermined size) (less than the predetermined size) in Step ST22, the control unit 200A proceeds to Step ST27 and proceeds to Step ST27. The suction operation is started and the process proceeds to step ST28. In step ST27, the shutter drive unit 127C is operated, the suction duct 122C is released by the shutter mechanism 126C, and the suction operation to the central portion 101c of the medium 101 is performed.
In step ST28, the control unit 200A measures the elapsed time T after the operation of the shutter drive unit 127C by the timer 204. When the elapsed time T becomes the time Tc in step ST29, the control unit 200A proceeds to step ST30. In step ST30, the control unit 200A operates the shutter driving units 127A and 127B to release the suction ducts 122A and 122B by the shutter mechanisms 126A and 126B, and the suction units 120A and 120B located at the end portions with respect to the end portions 101a and 101b. The suction operation is started and the process proceeds to step ST31.
That is, when the size S of the medium 101 is greater than or equal to the predetermined size S1, the control unit 200A determines the operation timing of the suction unit 120C and the suction units 120A and 120B as compared with the case where the size S of the medium 101 is less than the predetermined size S1. Control to increase the difference. That is, (0 [msec] ≦ Tc <Td). When Tc is 0 second, the suction ducts 122A to 122C are simultaneously released by all the shutter mechanisms 126A to 126C of the suction units 120A to 120C.
In other words, when the size S of the medium 101 is less than the predetermined size S1, the control unit 200A causes the suction unit 120C and the suction units 120A and 120B to be larger than when the size S of the medium 101 is equal to or larger than the predetermined size S1. The control is performed so that the difference in the operation timing is reduced.

  In step ST31, the control unit 200A determines completion of suction of the medium 101 on the suction surface 131A of the transport belt 131 from, for example, an elapsed time after the operation of the sensors or shutter mechanisms 126A and 126B, and then transports in step ST32. The belt drive motor 132 of the means 130 is operated to start the belt conveyance of the medium 101 by the conveyance belt 131, and this control is finished.

As described above, the size S information of the medium 101 is acquired, and the size of the medium 101 is changed by changing the operation timing of the suction unit 120C and the suction units 120A and 120B (shutter mechanisms 126A and 126B) according to the acquired size S information. The optimum suction operation according to S is performed.
When the medium 101 is, for example, a large size equal to or larger than JIS standard B2 size, bending in the width direction W is likely to occur. Therefore, the time difference between the suction unit 120C that is activated first and the suction units 120A and 120B that are activated thereafter is deflection. Generation of wrinkles due to bending can be suppressed by providing an interval to the extent that generation of the wrinkles can be suppressed.

  On the other hand, when the medium 101 is smaller than JIS standard B2 size, for example, smaller than JIS standard A3 size, since bending in the width direction W is difficult to occur, the suction unit 120C to be operated first, and the suction to be operated thereafter The time difference between the parts 120A and 120B can be made shorter than that in the case of a large size. In some cases, the plurality of suction units 120A to 120C may be operated simultaneously. When the operation time is shortened in this way, the time from when the medium 101 is quickly lifted to the suction surface 131A of the transport belt 131 and sucked and started to be transported can be shortened compared to the case of a large size. , It is advantageous to productivity. Note that the B2 size described as the size of the medium 101 is an example, and is not limited to this size.

  That is, when the size of the medium 101 is greater than or equal to the predetermined value, the control unit 200A determines the start timing of the suction operations of the plurality of suction units (120A, 120B, and 120C) more than when the size of the medium 101 is less than the predetermined value. Control to increase the interval. Thereby, generation | occurrence | production of a wrinkle can be suppressed.

  In the third embodiment and the fourth embodiment, the operation timing of the plurality of suction units 120A, 120B, and 120C is controlled based on the thickness X and the size S of the medium 101. However, the parameters used for the control In addition to these, materials (for example, resin sheets such as paper and prepreg, plate-like members, etc.) may be used as the type of medium 101. In this case, the operation timing of the plurality of suction units 120A, 120B, and 120C may be controlled in accordance with the type of the conveyed object 101. For example, in the case where the material such as prepreg has high rigidity and is difficult to bend in the width direction W, the plurality of suction portions 120A, 120B, and 120C are operated simultaneously, or a time difference is provided, but an operation time difference is compared with a sheet or the like. Set to a smaller value. On the other hand, when transporting a sheet, the time from the operation of the first suction unit 120C to the operation of the next suction unit 120A, 120B is set longer than when the prepreg is sucked and transported, so that the suction transport can be performed quickly. In addition, it can be sucked and conveyed without wrinkles.

  In the first to fourth embodiments, the plurality of suction units 120A, 120B, and 120C are individually provided with suction blades 123A to 123C and suction drive means 124A to 124C. It is not limited. For example, as shown in FIGS. 14 and 15, a suction section 120E configured such that one suction blade 123 as one negative pressure generating means and suction driving means 124 are connected to suction ducts 122A to 122C, respectively.

(Fifth embodiment)
In this embodiment, as shown in FIG. 16, any one of the medium suction devices 100 described in the first to fourth embodiments is applied to an image forming system. The image forming system 400 includes an image forming unit 401 that forms an image on, for example, paper P (medium) as a medium, a medium suction device 100, and a transport unit that transports the paper P sucked by the medium suction device 100. A plurality of roller pairs 416 are provided. As the image forming unit 401, an electrostatic latent image is formed on each image carrier 411 by a plurality of process cartridge units 412 including a drum-shaped image carrier 411, and toner as a developer is applied to the electrostatic latent image. The toner image is attached and developed as a toner image. The developed toner image is transferred to a sheet P by a transfer unit 413, and the toner image is fixed on the sheet P by a fixing unit 414 and stacked on a discharge tray 415. An image forming unit.
The image forming unit 401 may be an ink jet type image forming unit that forms an image by ejecting ink from the ink head onto the paper P as a medium instead of the electrophotographic method.
In any type of image forming unit, the uppermost sheet P stacked on the loading unit 110 is sucked and conveyed from the medium suction device 100 by the suction units 120A, 120B, and 120C. Separability of the paper P can be secured, paper jam and double feeding due to carry-forward can be prevented, and the separation time can be shortened, so that it is possible to shorten the printing time and cope with high-speed paper feeding. Therefore, it is possible to construct a highly productive image forming system 400 corresponding to a large format.

(Sixth embodiment)
In this embodiment, as shown in FIGS. 17A, 17B, and 17C, any one of the medium suction devices 100 described in the first to fourth embodiments is applied to a medium inspection system. The medium inspection system 500 includes an inspection device 501 as an inspection unit that inspects, for example, a prepreg sheet PS as a medium, a medium suction device that feeds the prepreg sheet PS to the inspection device 501, and a control unit 505. For example, a medium suction device 100 is provided.

  In any of the embodiments, the arrangement of the suction portions can be changed as appropriate. For example, when the suction unit is arranged as shown in FIGS. 18A and 18B, the suction units are arranged side by side when viewed from the conveyance direction A as shown in FIG. Therefore, an effect equivalent to that of the above-described embodiment can be exhibited.

The medium inspection system 500 includes a sheet conveying unit 502 that conveys the prepreg sheet PS below the inspection apparatus 501. The sheet conveying unit 502 constitutes a conveying device that conveys the prepreg sheet PS that is a medium sucked by the medium suction device 100. The prepreg sheet PS separated and fed by the medium suction device 100 is moved below the inspection device 501 by the sheet conveying unit 502 as shown in FIG. 17A. The inspection apparatus 501 detects the surface damage and size of the prepreg sheet PS by performing line scan and image information, and detects the surface state while conveying the prepreg sheet PS by the sheet conveying means 502. .
The medium inspection system 500 includes a suction device 503 on the downstream side of the inspection apparatus 501 in the conveyance direction and above the sheet conveyance unit 502. As shown in FIGS. 17B and 17C, the suction device 503 sucks the prepreg sheet PS1 in which the surface defect is detected by the inspection device 501. The medium inspection system 500 includes a stacking device 504 on the downstream side of the sheet conveying unit 502 in the conveying direction. The stacking device 504 discharges and stacks prepreg sheets PS that have no surface defects, that is, that are not sucked by the suction device 503 among the prepreg sheets PS transported by the sheet transporting unit 502.

  Note that the prepreg is uniformly impregnated with a thermosetting resin such as epoxy mixed with an additive such as a curing agent or an adhesive material into a fibrous reinforcing material such as glass cloth or carbon fiber, and heated or dried. It is a reinforced plastic molding material in a semi-cured state. It refers to a sheet-like material mainly made by impregnating carbon fiber with resin.

As shown in FIG. 17A, an inspection device 501, a drive motor 506 as a drive source of the sheet conveying unit 502, and a suction drive source 507 of the suction device 503 are connected to the control unit 505 via signal lines. . The control unit 505 has a function of determining a non-defective product and a defective product from image information transmitted from the inspection apparatus 501. When the prepreg sheet PS detected by the inspection device 501 is a defective product (PS1), the control unit 505 operates the suction drive source 507 of the suction device 503 to cause the suction force to act on the sheet conveying unit 502. For this reason, the prepreg sheet PS1 determined to be defective is removed from the sheet conveying means 502 by the suction device 503.
As described above, the uppermost one of the stacked prepreg sheets PS is sucked from the medium suction device 100 by the suction units 120A, 120B, and 120C and conveyed, so that the prepreg sheet PS can be separated. In addition to preventing jamming and double-feeding of prepreg sheet PS due to carry-in, the separation time can be shortened, so the inspection time of prepreg sheet PS can be shortened and high-speed conveyance can be supported, and productivity Can be constructed.

  Some prepreg sheets have a thickness as thin as 0.02 mm to 0.2 mm, and there is a sufficient possibility that bending and wrinkling will occur. In particular, when the sheet size (area) is large, the “bending margin” increases, so that the occurrence of bending becomes more remarkable.

The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the specific embodiments, and the present invention described in the claims is not specifically limited by the above description. Various modifications and changes are possible within the scope of the gist of the invention.
For example, the medium 101 according to the present embodiment is not limited to a sheet P made of resin such as a sheet P as a sheet or a prepreg sheet PS, and may be a recording sheet, a recording sheet, a film, a cloth, or the like. Of course. Also in this embodiment, the medium 101 includes all the conveyed items that can be sucked in the form of a sheet such as paper, recording medium, OHP, prepreg, and copper foil.
In addition, the plurality of suction units 120A, 120B, and 120C have been described as being arranged linearly (in a straight line) in the width direction W, but the suction units 120A and 120B, the suction unit 120A, and the suction unit 120B that are located at the ends are described. Even if the suction part 120C disposed between the two is offset with respect to the transport direction A, the same effect as that of the embodiment can be obtained by controlling at the operation timing described in the above embodiment. be able to.

  Further, “conveying” includes not only the act of moving the sheet (medium 101) by the conveying belt 131 but also the act of moving the sheet by simply sucking the sheet by the suction unit 120.

  The effects described in the embodiments of the present invention are only the most preferable effects resulting from the present invention, and the effects of the present invention are limited to those described in the embodiments of the present invention. is not.

  As the image forming system, for example, the configuration described in Patent Document 3 (corresponding US application: US8449071) can be used. In addition to the ink jet method, a known technique such as an electrophotographic method can be used.

100 Medium suction device 101 Medium 101a, 101b End (both ends) of medium
101c Central part of medium 110 Placement part 120A Suction part 120B Suction part 120C Suction part 121A, 121B, 121C Suction chamber part (chamber part)
124A, 124B, 124C Negative pressure generating means (suction drive means)
126A, 126B, 126C Control valve (shutter mechanism)
DESCRIPTION OF SYMBOLS 130 Conveyance means 200, 200A Control part 400 Image forming system 401 Image forming part 416 Conveyance means 500 Medium inspection system 501 Inspection part 502 Conveyance apparatus A Medium conveyance direction P Medium (paper)
PS medium (prepreg)
S Medium size S1 Predetermined size X Medium thickness X1 Predetermined thickness W W Conveyance width direction

JP 2014-205574 A JP 2010-023378 A US8449071

Claims (11)

It has a first suction part and a second suction part that face the medium to be transported and are arranged side by side when viewed from the transport direction of the medium,
The medium suction device, wherein the second suction unit starts the suction operation after the first suction unit starts the suction operation. A third suction part arranged side by side opposite to the first suction part with respect to the second suction part as seen from the transport direction;
The medium suction device according to claim 1, wherein the third suction unit starts a suction operation after the second suction unit starts a suction operation. A third suction part arranged side by side opposite to the second suction part with respect to the first suction part as seen from the transport direction;
The medium suction device according to claim 1, wherein the third suction unit starts a suction operation after the second suction unit starts a suction operation. A third suction part arranged side by side opposite to the second suction part with respect to the first suction part as seen from the transport direction;
The medium suction device according to claim 1, wherein the second suction unit and the third suction unit simultaneously start a suction operation. The medium suction device according to any one of claims 1 to 4, further comprising a control unit that controls a start timing of the suction operation of the plurality of suction units according to a type of the medium. The medium type is the thickness of the medium;
In the control unit, when the thickness of the medium is less than a predetermined value, the interval between the start timings of the suction operations of the plurality of suction units becomes larger than when the thickness of the medium is equal to or greater than a predetermined value. The medium suction device according to claim 5, wherein the medium suction device is controlled as follows. The type of the medium is the basis weight of the medium,
In the control unit, when the basis weight of the medium is less than a predetermined value, the interval between the start timings of the suction operations of the plurality of suction units is larger than when the basis weight of the medium is a predetermined value or more. The medium suction device according to claim 5, wherein the medium suction device is controlled as follows. The type of medium is the size of the medium;
The control unit is configured such that when the size of the medium is equal to or larger than a predetermined size, the interval between the start timings of the suction operations of the plurality of suction units is larger than when the size of the medium is less than the predetermined size. The medium suction device according to claim 5, wherein the medium suction device is controlled. The suction part is
A chamber part through which gas passes;
A negative pressure generating means for making the chamber part into a negative pressure;
The medium suction device according to claim 1, further comprising a control valve that adjusts the negative pressure. A medium suction device according to any one of claims 1 to 9,
Transport means for transporting the medium sucked by the medium suction device;
An image forming system comprising: an image forming unit that forms an image on the medium transported by the transport unit. A medium suction device according to any one of claims 1 to 9,
A transport device for transporting the medium sucked by the medium suction device;
An inspection unit that inspects the medium conveyed by the conveyance device.

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