JP2019182653A - Medium processing device, post-processing device, medium conveyance device - Google Patents

Abstract

To provide a medium processing device and a post-processing device capable of stacking mediums on a stacker in a state where deformation of the medium is suppressed.SOLUTION: The medium processing device comprises: a suction mechanism 38 for sucking a medium 12 recorded by a recording head by a conveyance belt 29; a rotating mechanism 37 for rotating the conveyance belt 29; an intermediate stacker 32 for stacking the medium 12 conveyed by the conveyance belt 29; and a change mechanism 51 for changing a movable area MA. The rotating mechanism 37 rotates the conveyance belt 29, sucking the medium 12, in a first rotational direction A1 to convey the medium 12 in a first conveyance direction Y1, and then rotates the conveyance belt 29 in a second rotational direction A2 to convey the medium 12 in a second conveyance direction Y2 and stack it on the intermediate stacker 32. The change mechanism 51 makes the movable area MA when the medium 12 is conveyed in the second conveyance direction Y2 narrower compared with the case where the medium 12 is conveyed in the first conveyance direction Y1.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a medium processing apparatus that processes a medium, a post-processing apparatus provided in the medium processing apparatus, and a medium transport apparatus.

  As an example of the post-processing apparatus, there is an integrated apparatus described in Patent Document 1. The stacking apparatus includes a suction conveyor that sucks and transports a lithographic printing plate, which is an example of a medium, from above. In the suction conveyor, the lithographic printing plate conveyed by suction is dropped from above and accumulated on a stacking table as an example of a stacker.

JP 2008-266020 A

  When a medium recorded by a printing apparatus that discharges and records a liquid is stacked on a stacker using the technique described in Patent Document 1, a problem unique to a medium recorded by a printing apparatus that uses liquid occurs. In particular, it is known that a medium on which an aqueous liquid recording material adheres curls. An example of an aqueous liquid recording material is aqueous ink.

  The medium may curl even if it absorbs moisture in the air. For example, even when the medium wound in a roll is unwound and conveyed, the medium may be curled by the curl. The medium may curl due to the shape of the transport path or the end being pushed.

  When trying to stack the curled medium on the stacker, there is a possibility that the medium cannot be properly stacked on the stacker. In other words, when the subsequent medium is stacked on the medium previously stacked on the stacker, the subsequent medium is curled, so that the end in the transport direction of the subsequent medium is transported while hitting the preceding medium. May be. As a result, the end is positioned between the preceding medium and the succeeding medium. Specifically, one end in the transport direction of the succeeding medium is curled toward the other end. There was a risk of being stacked on the stacker.

  A medium processing apparatus that solves the above problems includes a processing unit that performs processing on a medium, an adsorption mechanism that adsorbs the medium processed by the processing unit to an annular conveyance belt, and the conveyance belt in the first rotation direction and the medium. A rotation mechanism that rotates in a second rotation direction opposite to the first rotation direction, a stacker that stacks the medium conveyed by the conveyance belt, and the medium can be displaced between the conveyance belt and the stacker. A change mechanism that changes a region to be formed, wherein the suction mechanism sucks a second surface of the medium opposite to the first surface on the stacker side, and the rotation mechanism sucks the medium. The conveyance belt is rotated in the first rotation direction to convey the medium in the first conveyance direction, and then the conveyance belt is rotated in the second rotation direction to convey the medium in the second conveyance direction. Is stacked on the stacker Te, the change mechanism, said area when conveying the medium to the second conveying direction, is narrower than when conveying the medium in the first transport direction.

  A post-processing apparatus that solves the above problem includes an adsorption mechanism that adsorbs a discharged medium to an annular conveyance belt, and rotates the conveyance belt in a first rotation direction and a second rotation direction opposite to the first rotation direction. A rotating mechanism for stacking, an intermediate stacker for stacking the medium transported by the transport belt, a post-processing mechanism for performing post-processing on the medium stacked on the intermediate stacker, and the medium fed from the intermediate stacker. A stacking discharge stacker; and a changing mechanism for changing a region in which the medium can be displaced between the transport belt and the intermediate stacker, wherein the suction mechanism is a first on the intermediate stacker side of the medium. The second surface opposite to the surface is sucked, and the rotating mechanism rotates the transport belt sucking the medium in the first rotation direction. After transporting the recording medium in the first transport direction, the transport belt is rotated in the second rotation direction so that the medium is transported in the second transport direction and stacked on the intermediate stacker. Is narrower than when the medium is transported in the first transport direction.

  A medium conveying apparatus that solves the above problems includes an adsorption mechanism that adsorbs a discharged medium to an annular conveyance belt, and rotates the conveyance belt in a first rotation direction and a second rotation direction opposite to the first rotation direction. A rotating mechanism for stacking, a stacker for stacking the medium transported by the transport belt, and a change mechanism for changing a region in which the medium can be displaced between the transport belt and the stacker, and The mechanism sucks a second surface of the medium opposite to the first surface on the stacker side, and the rotating mechanism rotates the transport belt that sucks the medium in the first rotation direction to rotate the medium. And then transporting the medium in the second transport direction and stacking the stacker on the stacker, and rotating the transport belt in the first transport direction. , The region at the time of conveying the medium to the second conveying direction, is narrower than when conveying the medium in the first transport direction.

The schematic side view of 1st Embodiment of a medium processing apparatus provided with a post-processing apparatus. The schematic side view of the medium conveying apparatus with which a post-processing apparatus is provided. The schematic bottom view of a conveyance belt. The block diagram which shows the electric constitution of a medium processing apparatus. FIG. 3 is a schematic side view of a medium conveying device that adsorbs a medium to a conveying belt. FIG. 3 is a schematic side view of a medium transport device that transports an adsorbed medium in a first transport direction. FIG. 6 is a schematic side view of the medium transport device when the rotation direction of the transport belt is switched. The schematic side view of the medium conveying apparatus which conveys a medium in a 2nd conveyance direction. FIG. 3 is a schematic side view of a medium transport device that stacks a plurality of media. The schematic side view of 2nd Embodiment of a medium conveying apparatus. FIG. 3 is a schematic side view of a medium conveying device that adsorbs a medium to a conveying belt. FIG. 3 is a schematic side view of a medium transport device that transports an adsorbed medium in a first transport direction. FIG. 6 is a schematic side view of the medium transport device when the rotation direction of the transport belt is switched. The schematic side view of the medium conveying apparatus which conveys a medium in a 2nd conveyance direction. The schematic side view of 3rd Embodiment of a medium conveying apparatus. The F16-F16 line | wire arrow schematic end view in FIG. FIG. 6 is a schematic end view showing a state where the alignment member is located at the alignment position. The schematic side view of the medium conveying apparatus which conveys a medium in a 2nd conveyance direction. FIG. 6 is a schematic end view showing a state where the alignment member is located at the alignment position. FIG. 6 is a schematic end view showing a state where the alignment member is located at a retracted position. FIG. 6 is a schematic end view showing a state where the alignment member is located at the alignment position. The schematic side view of 4th Embodiment of a medium conveying apparatus. The perspective view of a change mechanism. FIG. 3 is a schematic side view of a medium conveying device that adsorbs a medium to a conveying belt. FIG. 3 is a schematic side view of a medium transport device that transports an adsorbed medium in a first transport direction. FIG. 6 is a schematic side view of the medium transport device when the rotation direction of the transport belt is switched. The schematic side view of the medium conveying apparatus which conveys a medium in a 2nd conveyance direction. FIG. 3 is a schematic side view of a medium transport device that stacks a plurality of media.

(First embodiment)
Hereinafter, a first embodiment of a medium processing apparatus, a post-processing apparatus, and a medium conveying apparatus will be described with reference to the drawings. The medium processing apparatus is, for example, an ink jet printer that ejects ink, which is an example of a liquid, onto a medium such as paper and records characters and images on the medium.

  As shown in FIG. 1, the medium processing apparatus 11 includes a printing apparatus 13 that performs preprocessing that is an example of processing on the medium 12, a postprocessing apparatus 14 that performs postprocessing on the preprocessed medium 12, and the printing apparatus 13. And an intermediate device 15 located between the post-processing device 14. The preprocessing is a recording process for recording characters and images on the medium 12. The post-processing is processing that accompanies the recording processing, and the post-processing device 14 of the present embodiment performs a stapler processing for binding a plurality of recorded media 12 with staples.

  The medium processing apparatus 11 is provided with a conveyance path 17 indicated by a two-dot chain line in FIG. 1 continuing from the printing apparatus 13 to the post-processing apparatus 14 via the intermediate apparatus 15. The medium processing apparatus 11 includes at least one transport roller pair 19 that transports the medium 12 along the transport path 17 by driving the transport motor 18. The transport roller pair 19 in the intermediate device 15 and the post-processing device 14 may include a transport motor 18 in each device. Further, the printing device 13, the intermediate device 15, and the post-processing device 14 may include a plurality of transport motors 18. By doing so, the operations of the plurality of transport roller pairs 19 in the printing device 13, the intermediate device 15, and the post-processing device 14 can be efficiently controlled.

  In the drawing, assuming that the medium processing apparatus 11 is placed on a horizontal plane, the direction of gravity is indicated by the Z axis, and directions along the plane intersecting the Z axis are indicated by the X axis and the Y axis. The X axis, the Y axis, and the Z axis are preferably orthogonal to each other, and the X axis and the Y axis are along the horizontal plane. In the following description, the X-axis direction is also referred to as the width direction X, the Z-axis direction is also referred to as the vertical direction Z, and the direction perpendicular to the width direction X and along the transfer path 17 is also referred to as the first transfer direction Y1. The first transport direction Y1 is a direction in which the transport roller pair 19 transports the medium 12, and is a direction from the upstream printing apparatus 13 toward the downstream post-processing apparatus 14.

  The printing apparatus 13 is detachably provided with a cassette 21 that can accommodate the medium 12 in a stacked state. A plurality of cassettes 21 may be detachably provided in the printing apparatus 13. The printing apparatus 13 includes a pickup roller 22 that sends out the uppermost medium 12 among the media 12 stored in the cassette 21, and a separation roller 23 that separates the medium 12 sent out by the pickup roller 22 one by one. .

  The printing apparatus 13 includes a support unit 25 that is provided at a position along the conveyance path 17 and supports the medium 12, and a processing unit that performs recording processing by discharging liquid from the nozzle 26 to the medium 12 supported by the support unit 25. A recording head 27 as an example. The recording head 27 is provided at a position facing the support portion 25 with the conveyance path 17 interposed therebetween. The recording head 27 may be a so-called line head that can simultaneously discharge liquid in the width direction X, or a so-called serial head that discharges liquid while moving in the width direction X.

  The printing apparatus 13 includes, as a part of the transport path 17, a discharge path 101 through which the medium 12 is discharged, a switchback path 102 through which the medium 12 is switched back and a reverse path 103 through which the attitude of the medium 12 is reversed. Prepare. The discharge path 101 is a path through which the medium 12 recorded by the recording head 27 is discharged toward the discharge unit 104. The discharge unit 104 is located above the printing apparatus 13. The medium 12 conveyed through the discharge path 101 is placed on the discharge unit 104.

  The switchback path 102 and the reverse path 103 are paths through which the medium 12 to be printed on both sides is conveyed. The switchback path 102 extends along the discharge path 101. The reverse path 103 extends from the switchback path 102. The inversion path 103 extends from the downstream of the recording head 27 toward the upstream of the recording head 27 so as to pass above the recording head 27.

  When performing duplex printing, the medium 12 printed on one side is first conveyed to the switchback path 102. Next, the medium 12 is transported back in the switch back path 102. That is, the medium 12 is conveyed in the reverse direction in the switchback path 102. Next, the medium 12 is conveyed from the switchback path 102 to the reverse path 103.

  When the medium 12 is conveyed through the switchback path 102 and the reverse path 103, the medium 12 is reversed from a posture in which one printed surface faces upward to a posture downward. The medium 12 conveyed through the reverse path 103 is recorded again by the recording head 27. At this time, the medium 12 is printed on the surface opposite to the surface already printed. In this way, the printing apparatus 13 performs double-sided printing on the medium 12. The printing device 13 conveys the printed medium 12 toward the discharge unit 104 or the intermediate device 15.

  As a part of the transport path 17, the intermediate device 15 includes an introduction path 201, a first switchback path 202, a second switchback path 203, a first merge path 204, a second merge path 205, and a derivation path 206. With. The introduction path 201 is a path through which the medium 12 is introduced from the printing apparatus 13. The first switchback path 202 and the second switchback path 203 are paths that extend from the introduction path 201 and through which the medium 12 is switched back. The first switchback path 202 and the second switchback path 203 extend so as to branch from the introduction path 201.

  The first joining path 204 is a path extending from the first switchback path 202. The second joining path 205 is a path extending from the second switchback path 203. The derivation path 206 is a path that extends from the first merging path 204 and the second merging path 205 and that leads the medium 12 toward the post-processing device 14. The first merge path 204 and the second merge path 205 merge at the derivation path 206.

  The medium 12 transported from the printing device 13 to the intermediate device 15 is transported through the introduction path 201. The medium 12 transported through the introduction path 201 is transported to either the first switchback path 202 or the second switchback path 203. The medium 12 transported along the introduction path 201 is provided with a first switchback path 202 and a second switchback by a flap or the like provided at a location where the introduction path 201 branches to the first switchback path 202 and the second switchback path 203. The route 203 is sorted.

  The medium 12 transported to the first switchback path 202 is switchback transported in the first switchback path 202. When the medium 12 is switched back in the first switchback path 202, the medium 12 is transported to the first merge path 204. The medium 12 conveyed through the first merge path 204 is conveyed to the derivation path 206.

  The medium 12 transported from the introduction path 201 to the second switchback path 203 is switchback transported in the second switchback path 203. When the medium 12 is switched back in the second switchback path 203, the medium 12 is transported to the second merging path 205. The medium 12 conveyed through the second merging path 205 is conveyed to the derivation path 206.

  The medium 12 transported through the intermediate device 15 is switchback transported in the first switchback path 202 or the second switchback path 203. Therefore, the medium 12 transported by the intermediate device 15 is reversed so that the surface printed immediately before in the printing device 13 changes from a posture facing upward to a posture facing downward. As a result, the medium 12 led out to the post-processing device 14 is in a posture in which the surface printed immediately before in the printing device 13 faces downward. By transporting the medium 12 to the intermediate device 15, the drying time of the medium 12 from which the liquid has been discharged is ensured. By ensuring the drying time of the medium 12, it is possible to suppress the transfer of the liquid ejected to the medium 12, curling of the medium 12 due to the moisture of the ejected liquid, and the like.

Next, an embodiment of the post-processing device 14 will be described.
As shown in FIG. 1, the post-processing device 14 includes a medium transport device 28. The medium transport device 28 includes a transport mechanism 30 that sucks and transports the medium 12 to the transport belt 29. The medium transport device 28 may include a detection unit 31 that detects the medium 12 positioned upstream of the transport mechanism 30 in the first transport direction Y1. The medium transport device 28 includes an intermediate stacker 32 that is an example of a stacker that stacks the media 12 transported by the transport belt 29. The post-processing device 14 includes a post-processing mechanism 33 that performs post-processing on the medium 12 stacked on the intermediate stacker 32, and a discharge stacker 34 that stacks the medium 12 sent from the intermediate stacker 32.

  As shown in FIG. 2, the intermediate stacker 32 includes an alignment unit 36 that aligns the rear end 12r that is the upstream end of the stacked media 12 in the first transport direction Y1. The intermediate stacker 32 is provided obliquely so that the end on the alignment portion 36 side is located below the vertical direction Z with respect to the opposite end.

  The transport mechanism 30 is provided at a position above the intermediate stacker 32 in the vertical direction Z so that the intermediate stacker 32 and the transport belt 29 face each other. The conveyance mechanism 30 includes a rotation mechanism 37 that rotates the conveyance belt 29 and an adsorption mechanism 38 that adsorbs the medium 12 that has been recorded by the recording head 27 and discharged from the intermediate device 15 to the annular conveyance belt 29.

  The rotation mechanism 37 includes a belt motor 40 that rotates the conveyor belt 29, a drive pulley 41 that rotates by driving the belt motor 40, and a driven pulley 42 that is rotatable about an axis parallel to the axis of the drive pulley 41. Prepare. The rotation mechanism 37 of the present embodiment includes two driven pulleys 42. The conveyor belt 29 is stretched around the drive pulley 41 and the driven pulley 42 in a triangular ring shape. The conveyor belt 29 rotates around the outer sides of the driving pulley 41 and the driven pulley 42 by driving the belt motor 40. Specifically, the rotation mechanism 37 rotates the conveyor belt 29 in the first rotation direction A1 by driving the belt motor 40 to rotate forward. The rotation mechanism 37 rotates the belt motor 40 in the reverse direction to rotate the transport belt 29 in the second rotation direction A2 opposite to the first rotation direction A1.

  The suction mechanism 38 includes a conveyance belt 29, a box-like suction part 45 having a suction chamber 44, and a fan 47 that sucks the suction chamber 44 through a duct 46. The outer surface of the conveyance belt 29 is an adsorption surface 29 a that adsorbs the medium 12. The suction part 45 is provided in a state in contact with an inner surface 29 b that is an inner surface of the transport belt 29 so that a part of the suction chamber 44 is covered with the transport belt 29.

  As shown in FIG. 3, a plurality of conveyor belts 29 may be arranged in a row in the width direction X around the driving pulley 41 and the driven pulley 42. The transport belt 29 is formed with a large number of holes 49 penetrating the transport belt 29 so as to open to the suction surface 29a and the inner surface 29b.

  As shown in FIG. 2 and FIG. 3, the suction mechanism 38 creates a negative pressure in the suction chamber 44 as the fan 47 is driven, and passes through the hole 49 communicating with the suction chamber 44 to the suction surface 29 a of the transport belt 29. To adsorb. That is, the adsorption mechanism 38 adsorbs the medium 12 to the conveyance belt 29 by a suction method that sucks air from the holes 49 formed in the conveyance belt 29.

  As shown in FIG. 2, the transport mechanism 30 adsorbs the medium 12 to the transport belt 29, and rotates the transport belt 29 in this state, so that the medium 12 is moved in the region between the transport belt 29 and the intermediate stacker 32. Transport. Specifically, the rotation mechanism 37 conveys the medium 12 in the first conveyance direction Y1 by rotating the conveyance belt 29 that adsorbs the medium 12 in the first rotation direction A1. The rotation mechanism 37 conveys the medium 12 in the second conveyance direction Y2 opposite to the first conveyance direction Y1 by rotating the conveyance belt 29 that adsorbs the medium 12 in the second rotation direction A2. The rotation mechanism 37 transports the medium 12 in the first transport direction Y1, then transports the medium 12 in the second transport direction Y2 and stacks it on the intermediate stacker 32.

  As shown in FIG. 2, the medium transport device 28 includes a changing mechanism 51 that changes the size of the movable region MA that is an example of a region in which the medium 12 can be displaced between the transport belt 29 and the intermediate stacker 32. The post-processing device 14 includes a pair of alignment members 52 that align the medium 12 stacked on the intermediate stacker 32 in the width direction X, and a moving mechanism 53 that moves the alignment member 52 in the width direction X. FIG. 2 illustrates one of the pair of alignment members 52.

  The change mechanism 51 includes a movable guide 56 that can rotate around a guide shaft 55 and a guide motor 57 that rotates the guide shaft 55. The movable guide 56 is driven by a guide motor 57 into a first guide position indicated by a solid line in FIG. 2 and a second guide position indicated by a two-dot chain line in FIG. 2 that is closer to the intermediate stacker 32 than the first guide position. It is provided to be movable.

  The guide shaft 55 is provided at a position inside the transport belt 29 so as to extend in the width direction X. The movable guide 56 positioned at the first guide position is positioned farther from the intermediate stacker 32 than the conveyor belt 29, and is positioned above the portion where the hole 49 communicating with the suction chamber 44 is formed on the suction surface 29a. To do. When the movable guide 56 is positioned at the first guide position, the region between the conveyor belt 29 and the intermediate stacker 32 becomes the movable region MA.

  A part of the movable guide 56 located at the second guide position is located closer to the intermediate stacker 32 than the conveyor belt 29 and intersects the suction surface 29a when viewed in the width direction X. When the movable guide 56 is positioned at the second guide position, the movable area MA is narrowed by the movable guide 56, and an area between the movable guide 56 and the intermediate stacker 32 becomes a part of the movable area MA.

  When the movable guide 56 is positioned at the first guide position, the distal end 56a of the movable guide 56 that is separated from the guide shaft 55 is positioned downstream of the guide shaft 55 in the second transport direction Y2. The movable guide 56 located at the first guide position is rotated so that the tip 56a is lowered and moved to the second guide position. Therefore, the movable area MA when the movable guide 56 is located at the second guide position is narrower in the downstream in the second transport direction Y2 than the movable area MA when the movable guide 56 is located at the first guide position.

  The pair of alignment members 52 are provided with an interval in the width direction X. The alignment member 52 is formed with a notch 59 that avoids contact with the movable guide 56 located at the second guide position and allows the movable guide 56 to move in the operation of the alignment member 52 aligning the medium 12. Yes. When the movable guide 56 is located at the second guide position, the movable guide 56 can move while avoiding the alignment member 52 via the notch 59. The alignment member 52 has an alignment surface 60 that is an example of a first guide surface that contacts the end of the medium 12 in the width direction X and aligns the medium 12. The moving mechanism 53 adjusts the pair of alignment members 52 to the size of the medium 12 stacked on the intermediate stacker 32 so that the alignment surface 60 of the alignment member 52 and the end of the medium 12 in the width direction X come into contact with each other. To move. That is, the pair of alignment members 52 moves relative to each other in the width direction X.

  The notch 59 is located at a position where the first end 59a that is the upstream end in the second transport direction Y2 and the second end 59b that is the downstream end are different in the vertical direction Z. Specifically, the first end 59 a is located above the second end 59 b in the vertical direction Z and close to the transport belt 29. The first end 59a and the second end 59b are located above the distal end 56a of the movable guide 56 located at the second guide position indicated by a two-dot chain line in FIG. Located below Z. Therefore, the movable guide 56 located at the second guide position intersects the first imaginary line L1 connecting the first end 59a and the second end 59b.

  The alignment member 52 includes a protrusion 61 that is positioned above the vertical direction Z with respect to the second imaginary line L2 that extends a straight line along the suction surface 29a downstream in the first transport direction Y1. The protrusion 61 constitutes a part of the alignment surface 60. The protruding portion 61 is positioned above the notch 59 in the vertical direction Z. The protruding portion 61 is arranged in the first conveying direction Y1 with the driving pulley 41 with the conveying belt 29 interposed therebetween.

  Even if the medium 12 is deformed at a position between the conveyance belt 29 and the intermediate stacker 32 and the medium 12 cannot contact the alignment member 52 and cannot be aligned, the conveyance belt 29 is not in the second virtual state. Since it protrudes to a position above the line L2 in the vertical direction Z, the medium 12 can be reliably brought into contact with the protruding portion 61, and alignment is possible.

Next, the electrical configuration of the medium processing apparatus 11 will be described.
As shown in FIG. 4, the medium processing apparatus 11 includes a control unit 62 that comprehensively controls driving of each mechanism in the medium processing apparatus 11. The control unit 62 includes a processing circuit including a computer and a memory, for example. The control unit 62 controls various operations executed by the medium processing apparatus 11 according to a program stored in the memory. The control unit 62 includes a time measuring unit 63 that measures time. The control unit 62 is connected to the detection unit 31 so as to receive a signal. The control unit 62 transmits signals to the transport motor 18, the recording head 27, the post-processing mechanism 33, the belt motor 40, the fan 47, the changing mechanism 51, and the moving mechanism 53 to control the operation of each mechanism.

Next, the operation of the medium processing apparatus 11 will be described.
As shown in FIG. 2, when the medium 12 is transported in the first transport direction Y1 by the transport roller pair 19, the control unit 62 positions the movable guide 56 at the first guide position indicated by the solid line in FIG. Then, the fan 47 is driven and the belt motor 40 is driven to rotate in the forward direction to rotate the conveyor belt 29 in the first rotation direction A1.

  As illustrated in FIG. 5, when the medium 12 is transported to the transport belt 29, the suction mechanism 38 sucks the upper surface 12 b that is an example of the second surface of the medium 12. The upper surface 12b of the medium 12 is a surface opposite to the lower surface 12a, which is an example of the first surface of the medium 12 on the intermediate stacker 32 side.

  When the medium 12 is attracted to the suction surface 29a and transported in the first transport direction Y1 by the transport belt 29 rotating in the first rotation direction A1, the movable guide 56 is located at the first guide position above the suction surface 29a. Located in. Therefore, the medium 12 is transported in the first transport direction Y <b> 1 in a state where it is not in contact with the movable guide 56 or along the movable guide 56.

  As shown in FIG. 6, when the detecting unit 31 detects the trailing end 12r of the medium 12, the control unit 62 moves the movable guide 56 to the second guide position after a predetermined time has elapsed, and drives the belt motor 40 in the reverse direction. To do. That is, when the rear end 12r is detected in the state where the belt motor 40 is driven in the normal rotation, the control unit 62 continues to drive the belt motor 40 in the normal rotation for a predetermined time to rotate the transport belt 29 in the first rotation direction A1. Let When a predetermined time elapses after the trailing end 12r is detected, the controller 62 temporarily stops driving the belt motor 40, and then continuously rotates the belt motor 40 to rotate the transport belt 29 in the second rotation direction A2. Let

  The predetermined time is a time required for the rear end 12r of the medium 12 to leave the movable guide 56. The predetermined time is obtained by dividing the distance along the transport path 17 from the detection unit 31 to the position where the movable guide 56 positioned at the second guide position and the suction surface 29a of the transport belt 29 intersect each other by the speed at which the medium 12 is transported. It is almost equal to the quotient. When the predetermined direction has elapsed and the rotation direction of the conveyor belt 29 is changed from the first rotation direction A1 to the second rotation direction A2, the medium 12 has the rear end 12r of the guide shaft of the movable guide 56 in the first conveyance direction Y1. Temporarily stopped in a state of being located downstream of 55.

  As shown in FIG. 7, the control unit 62 moves the movable guide 56 to the second guide position while the conveyance of the medium 12 is stopped, and conveys the movable guide 56 in the state where the movable guide 56 is located at the second guide position. The belt 29 is rotated in the second rotation direction A2. That is, the changing mechanism 51 determines the size of the movable area MA on the downstream side in the second transport direction Y2 when transporting the medium 12 in the second transport direction Y2, and the transport mechanism MA when transporting the medium 12 in the first transport direction Y1. Compared to narrow.

  As shown in FIG. 8, when the transport belt 29 rotates in the second rotation direction A2, the medium 12 is transported in the second transport direction Y2. The movable guide 56 positioned at the second guide position contacts the upper surface 12b of the medium 12 conveyed in the second conveyance direction Y2, and peels the medium 12 from the suction surface 29a. The medium 12 peeled from the suction surface 29 a by the movable guide 56 is positioned with the rear end 12 r hitting the alignment portion 36 and stacked on the intermediate stacker 32 positioned below the conveyor belt 29.

  In this way, when the conveyance belt 29 rotates in the second rotation direction A2 and the medium 12 is conveyed in the second conveyance direction Y2, the medium 12 is conveyed while adsorbing a part of the medium 12 by the conveyance belt 29. A state occurs in which the intermediate stacker 32 is separated from each other. As a result, for example, the chance of the lower surface 12a of the subsequent medium 12 touching the upper surface 12b of the preceding medium 12 already stacked on the intermediate stacker 32 can be reduced.

  In particular, in an ink jet printer using water-based ink, when a liquid such as ink is attached to the medium 12, the resistance when the medium 12 is slid is increased. Therefore, when stacking the succeeding medium 12 on the intermediate stacker 32, if the time for contacting the lower surface 12a of the succeeding medium 12 with the upper surface 12b of the preceding medium 12 is long, the preceding medium 12 and the succeeding medium 12 Due to the sliding resistance, the trailing end 12r of the succeeding medium 12 may not properly hit the alignment portion 36, and the succeeding medium 12 may not be properly stacked on the intermediate stacker 32.

  However, by adsorbing the medium 12 to the conveyor belt 29, the lower surface 12a of the subsequent medium 12 can be less likely to come into contact with the upper surface 12b of the preceding medium 12 already stacked on the intermediate stacker 32. The medium 12 can be appropriately stacked on the intermediate stacker 32.

  As shown in FIG. 9, the second guide position of the movable guide 56 is preferably changed according to the number of media 12 stacked on the intermediate stacker 32. The control unit 62 may control the second guide position of the movable guide 56 so as to change according to the number of media 12 stacked on the intermediate stacker 32. When the number of media 12 stacked on the intermediate stacker 32 is smaller than the threshold number, the control unit 62 of the present embodiment positions the movable guide 56 at the second guide position indicated by the two-dot chain line in FIG. When the number of media 12 stacked on the stacker 32 is equal to or greater than the threshold number, the movable guide 56 is positioned at the second guide position indicated by the solid line in FIG. Therefore, when the number of media 12 is large, the distance between the movable guide 56 positioned at the second guide position and the intermediate stacker 32 is set so that the movable guide 56 positioned at the second guide position and the intermediate stacker 32 when the number of media 12 is small. It is larger than the interval with 32.

  When the medium 12 is stacked on the intermediate stacker 32, the area between the medium 12 stacked on the intermediate stacker 32 and the conveyor belt 29, and between the medium 12 stacked on the intermediate stacker 32 and the movable guide 56. The area becomes the movable area MA.

  When a predetermined number of media 12 are stacked on the intermediate stacker 32, the post-processing mechanism 33 performs post-processing on the media 12. The predetermined number to be post-processed is the number of copies per unit when the medium 12 is post-processed. The control unit 62 drives a delivery mechanism (not shown) to send the medium 12 stacked on the intermediate stacker 32 from the intermediate stacker 32 in the first transport direction Y1. The medium 12 sent out from the intermediate stacker 32 is stacked on the discharge stacker 34.

According to the above embodiment, the following effects can be obtained.
(1-1) The medium 12 separated from the conveyance belt 29 is deformed in the movable area MA. Therefore, there is a possibility that the medium 12 is greatly deformed as the movable area MA is wider. In that respect, the change mechanism 51 has a movable area MA between the transport belt 29 and the intermediate stacker 32 when transporting the medium 12 in the second transport direction Y2 compared to transporting the medium 12 in the first transport direction Y1. Narrow. Therefore, the medium 12 conveyed in the second conveying direction Y2 can be prevented from being greatly deformed away from the conveying belt 29, and the medium 12 can be stacked on the intermediate stacker 32 while the deformation of the medium 12 is suppressed.

  (1-2) When the movable guide 56 is positioned at the second guide position closer to the intermediate stacker 32 than the first guide position, the movable guide 56 contacts the upper surface 12b of the medium 12. Therefore, the medium 12 can be peeled off from the transport belt 29 by the movable guide 56 positioned at the second guide position, and the movable area MA can be narrowed.

  (1-3) The second guide position of the movable guide 56 changes according to the number of media 12 stacked on the intermediate stacker 32. Therefore, the relationship between the movable guide 56 positioned at the second guide position and the medium 12 stacked on the intermediate stacker 32 can be appropriately maintained.

  (1-4) The second guide position of the movable guide 56 is controlled by the control unit 62 so as to change according to the number of media 12 stacked on the intermediate stacker 32. Therefore, the possibility that the movable guide 56 contacts the medium 12 stacked on the intermediate stacker 32 can be reduced.

  (1-5) A notch 59 is formed in the pair of alignment members 52 included in the intermediate stacker 32. Therefore, the possibility that the movable guide 56 positioned at the second guide position interferes with the alignment member 52 can be reduced.

  (1-6) The suction mechanism 38 sucks the medium 12 to the transport belt 29 by a suction method. Therefore, the possibility that the medium 12 is damaged can be reduced as compared with the case where the medium 12 is conveyed by an adhesive belt, for example.

  (1-7) The frictional resistance when the media 12 to which the liquid is adhered is overlapped by the recording process is larger than the frictional resistance when the media 12 to which the liquid is not adhered is overlapped. Therefore, if the recording medium 12 is stacked so as to slide on the recording medium 12 that has been previously recorded, the medium 12 may not be aligned. In that respect, the transport mechanism 30 is positioned above the intermediate stacker 32 in the vertical direction Z, and stacks the medium 12 on the intermediate stacker 32 so as to drop the medium 12 from above. Therefore, even when the recording-processed medium 12 having a large frictional resistance is stacked on the intermediate stacker 32, the medium 12 can be aligned and stacked.

(Second Embodiment)
Next, a second embodiment of the medium processing apparatus, the post-processing apparatus, and the medium conveying apparatus will be described with reference to the drawings. In the second embodiment, the configuration of the changing mechanism is different from that in the first embodiment. And since it is substantially the same as 1st Embodiment in another point, the overlapping description is abbreviate | omitted by attaching | subjecting the same code | symbol about the same structure.

  As shown in FIG. 10, the post-processing device 14 includes a medium transport device 28. The medium transport device 28 includes a separation flap 65 that peels the medium 12 transported in the second transport direction Y2 from the transport belt 29, and a biasing member 66 such as a torsion spring that biases the separation flap 65. The post-processing device 14 may include a plurality of separation flaps 65 that are arranged at intervals in the width direction X. The separation flap 65 has a flap upper surface 65a and a flap lower surface 65b.

  Among the plurality of separation flaps 65, the separation flap 65 sandwiched between the pair of conveyance belts 29 acts in common with all the mediums 12 to be conveyed so as to separate the medium 12 from the conveyance belt 29. On the other hand, among the plurality of separation flaps 65, the separation flap 65 that is not sandwiched between the pair of conveyance belts 29 conveys the medium 12 with at least the pair of separation flaps 65 coming into contact with the side end portions of the medium 12. It acts to separate from the belt 29. In this way, even when the media 12 having different sizes is transported, it can be appropriately separated from the transport belt 29. Therefore, the position of the separation flap 65 that is not sandwiched between the pair of transport belts 29 is preferably determined according to a plurality of standard sizes of the medium 12 that is supposed to be transported.

  The separation flap 65 swings about the flap shaft 67 and is provided so that the posture can be changed. The separation flap 65 is movable to a first flap position indicated by a solid line in FIG. 10 and a second flap position indicated by a two-dot chain line in FIG. The urging member 66 urges the separation flap 65 toward the first flap position. When the separation flap 65 is located at the first flap position, the flap upper surface 65a and the flap lower surface 65b intersect the suction surface 29a of the transport belt 29 when viewed from the width direction X. When the separation flap 65 is located at the first flap position, the angle formed by the flap upper surface 65a and the suction surface 29a is an acute angle, and the angle formed by the flap lower surface 65b and the suction surface 29a is an obtuse angle.

  The change mechanism 69 provided in the medium transport device 28 of the present embodiment includes a transport mechanism 30 and a flap shaft 67 centering on the drive pulley 41 located on the most downstream side in the first transport direction Y1 of the drive pulley 41 and the driven pulley 42. Rotate. That is, the changing mechanism 69 changes the size of the movable area MA that is an area sandwiched between the conveyor belt 29 and the intermediate stacker 32 by moving the conveyor belt 29 relative to the intermediate stacker 32.

  The conveyor belt 29 is movably provided at a first belt position shown in FIG. 10 and a second belt position shown in FIG. 13 closer to the intermediate stacker 32 than the first belt position. The size of the movable area MA on the downstream side in the second transport direction Y2 when the transport mechanism 30 is located at the second belt position is narrower than when the transport mechanism 30 is located at the first belt position.

Next, the operation of the medium processing apparatus 11 will be described.
As shown in FIG. 10, when the medium 12 is transported in the first transport direction Y1 by the transport roller pair 19, the control unit 62 drives the fan 47 with the transport belt 29 positioned at the first belt position. At the same time, the belt motor 40 is driven forward to rotate the transport belt 29 in the first rotation direction A1.

  As shown in FIG. 11, when the medium 12 is transported to the transport belt 29, the suction mechanism 38 sucks the upper surface 12 b of the medium 12. The conveyance belt 29 that rotates in the first rotation direction A1 conveys the adsorbed medium 12 in the first conveyance direction Y1. When the medium 12 is conveyed to the separation flap 65, the front end 12 f of the medium 12 contacts the flap upper surface 65 a and pushes the separation flap 65. Accordingly, the separation flap 65 rotates against the urging force of the urging member 66 and moves to the second flap position indicated by the two-dot chain line in FIG.

  As shown in FIG. 12, at least a part of the flap upper surface 65 a comes into contact with the lower surface 12 a of the medium 12 when the medium 12 conveyed in the first conveyance direction Y <b> 1 passes through the separation flap 65. The medium 12 is pressed against the transport belt 29 by the separation flap 65 biased by the biasing member 66 and is transported while being sandwiched between the separation flap 65 and the transport belt 29.

  When the detection unit 31 detects the rear end 12r of the medium 12, the control unit 62 drives the belt motor 40 in the reverse direction after a predetermined time has elapsed. That is, when the rear end 12r is detected in the state where the belt motor 40 is driven in the normal rotation, the control unit 62 continues to drive the belt motor 40 in the normal rotation for a predetermined time to rotate the transport belt 29 in the first rotation direction A1. Let When a predetermined time elapses after the trailing end 12r is detected, the controller 62 temporarily stops driving the belt motor 40, and then continuously rotates the belt motor 40 to rotate the transport belt 29 in the second rotation direction A2. Let

  The predetermined time is a time required for the rear end 12r of the medium 12 to pass through the separation flap 65. The predetermined time is substantially equal to the quotient obtained by dividing the distance along the transport path 17 from the detection unit 31 to the tip of the separation flap 65 by the speed at which the medium 12 is transported.

  As shown in FIG. 13, when the rotation direction of the conveyor belt 29 is changed from the first rotation direction A1 to the second rotation direction A2 after a predetermined time has elapsed, the rear end 12r of the medium 12 has the first conveyance direction Y1. Is temporarily stopped in a state of being located downstream of the separation flap 65. When the medium 12 moves away from the separation flap 65, the separation flap 65 returns to the first flap position by the urging force of the urging member 66. That is, the separation flap 65 is located at the first flap position when the rotation direction of the transport belt 29 is switched from the first rotation direction A1 to the second rotation direction A2.

  The control unit 62 drives the changing mechanism 69 while the rotation of the conveyor belt 29 is temporarily stopped, moves the conveyor belt 29 to the second belt position, and rotates the conveyor belt 29 located at the second belt position to the second rotation. Rotate in direction A2. That is, when the medium 12 is transported in the first transport direction Y1, the changing mechanism 69 positions the transport belt 29 at the first belt position, and when the medium 12 is transported in the second transport direction Y2, the change belt 69 is placed in the middle. Close to the stacker 32 and positioned at the second belt position.

  As shown in FIG. 14, when the transport belt 29 rotates in the second rotation direction A2, the medium 12 is transported in the second transport direction Y2. At this time, the separation flap 65 is located at the first flap position, and at least a part of the flap lower surface 65b is in contact with the upper surface 12b of the medium 12 conveyed in the second conveyance direction Y2, and the medium 12 is separated from the suction surface 29a. Remove. The medium 12 peeled off from the suction surface 29 a by the separation flap 65 is positioned with the rear end 12 r abutting against the alignment portion 36 and stacked on the intermediate stacker 32 positioned on the lower side of the transport belt 29. When a predetermined number of media 12 are stacked on the intermediate stacker 32, the post-processing mechanism 33 performs post-processing on the media 12. The predetermined number to be post-processed is the number of copies per unit when the medium 12 is post-processed.

According to the second embodiment, the following effects can be obtained in addition to the effects of the first embodiment.
(2-1) The change mechanism 69 positions the transport belt 29 at the first belt position when transporting the medium 12 in the first transport direction Y1, and changes the transport belt 29 when transporting the medium 12 in the second transport direction Y2. Is positioned at the second belt position closer to the intermediate stacker 32 than the first belt position. Therefore, the movable area MA can be narrowed by the transport belt 29, and the medium 12 can be stacked on the intermediate stacker 32 with the transport belt 29 approaching the intermediate stacker 32, so that the medium 12 can be stacked quickly.

(Third embodiment)
Next, a third embodiment of the medium processing apparatus, the post-processing apparatus, and the medium conveying apparatus will be described with reference to the drawings. The third embodiment is different from the first and second embodiments in the configuration of the changing mechanism. And since it is the same as 1st Embodiment and 2nd Embodiment in another point, the overlapping description is abbreviate | omitted by attaching | subjecting the same code | symbol about the same structure.

  As illustrated in FIG. 15, the post-processing device 14 includes a blower 71 that blows air toward the medium 12. The pair of alignment members 52 includes a region guide 72 that is an example of a second guide surface provided at a position closer to the conveying belt 29 than the alignment surface 60. The area guide 72 can be opposed to the lower surface 12 a of the medium 12 that is attracted to and transported by the transport belt 29.

  As shown in FIG. 16, the region guide 72 is formed in a bowl shape so as to extend from a position above the alignment surface 60 of the alignment member 52 toward the other alignment member 52. Therefore, in the width direction X, the distance between the pair of region guides 72 is narrower than the distance between the pair of alignment surfaces 60.

  In the medium transport device 28 of the present embodiment, the moving mechanism 53, which is an example of a changing mechanism, moves the alignment member 52 in the width direction X, thereby changing the size of the movable area MA. The moving mechanism 53 moves the pair of alignment members 52 to a retracted position indicated by a solid line in FIG. 16 and an alignment position indicated by a two-dot chain line in FIG. In the width direction X, the interval between the pair of alignment members 52 positioned at the alignment position is narrower than the interval between the pair of alignment members 52 positioned at the retracted position.

  In the width direction X, the distance between the pair of alignment surfaces 60 when the pair of alignment members 52 are positioned at the alignment position is greater than the distance between the pair of alignment surfaces 60 when the pair of alignment members 52 are positioned at the retracted position. Is also narrow and substantially the same as the width of the medium 12. The distance between the region guides 72 in the width direction X when the pair of alignment members 52 is positioned at the alignment position is narrower than the width of the medium 12. The distance in the width direction X between the pair of region guides 72 when the pair of alignment members 52 is located at the retracted position is wider than the width of the medium 12.

Next, the operation of the medium processing apparatus 11 will be described.
As shown in FIGS. 15 and 16, the moving mechanism 53 moves the pair of alignment members 52 to the retracted position when the transport belt 29 rotates in the first rotation direction A1 and transports the medium 12 in the first transport direction Y1. Position. At this time, the area between the conveyor belt 29 and the intermediate stacker 32 becomes the movable area MA.

  When the detection unit 31 detects the rear end 12r of the medium 12, the control unit 62 temporarily stops driving the belt motor 40 after a predetermined time has elapsed after the detection of the rear end 12r, and then continuously drives the belt motor 40 in the reverse direction. Then, the conveyor belt 29 is rotated in the second rotation direction A2.

  As shown in FIG. 17, the moving mechanism 53 positions the alignment member 52 at the alignment position in a state where the rotation of the conveyor belt 29 is temporarily stopped. Thereby, the lower surface 12a of the medium 12 and the area guide 72 are opposed to each other, and an area between the conveyance belt 29 and the area guide 72 becomes a movable area MA. When the transport belt 29 rotates in the second rotation direction A2 and transports the medium 12 in the second transport direction Y2, the moving mechanism 53 positions the pair of alignment members 52 at the alignment positions.

  As shown in FIG. 18, when the transport belt 29 rotates in the second rotation direction A <b> 2, the medium 12 is transported in the second transport direction Y <b> 2 and peeled off from the transport belt 29 by the separation flap 65. The area guide 72 is in contact with the lower surface 12 a of the medium 12 peeled off from the conveyance belt 29 and guides the medium 12.

  The blowing unit 71 blows air toward the lower surface 12a of the medium 12 when the conveying belt 29 conveys the medium 12 in the second conveying direction Y2. The medium 12 on which the wind is blown from below is pressed against the upper side of the conveying belt 29 or a guide member (not shown) by the wind pressure, and is conveyed in a state where deformation such as curling is suppressed. When the rear end 12r of the medium 12 hits the alignment unit 36 and the medium 12 is positioned, the control unit 62 stops driving the belt motor 40 and stops driving the air blowing unit 71.

As shown in FIG. 19, the medium 12 peeled off from the transport belt 29 is supported by the area guide 72.
As shown in FIG. 20, when the next medium 12 is conveyed by the conveyance roller pair 19 and the detection unit 31 detects the front end 12 f of the next medium 12, the control unit 62 drives the belt motor 40 to rotate forward and conveys it. The belt 29 is rotated in the first rotation direction A1, and the pair of alignment members 52 are positioned at the retracted position. As a result, the medium 12 previously supported by the area guide 72 is stacked on the intermediate stacker 32 so as to be dropped from the area guide 72.

  As shown in FIG. 21, when the detection unit 31 detects the rear end 12r of the subsequent medium 12, the control unit 62 drives the moving mechanism 53 to move the pair of alignment members 52 to the alignment position. The alignment member 52 aligns the medium 12 stacked on the intermediate stacker 32 in the width direction X. The controller 62 temporarily stops the driving of the belt motor 40 after a predetermined time has elapsed after the trailing end 12r is detected, and then continuously rotates the belt motor 40 to rotate the transport belt 29 in the second rotational direction A2. The subsequent medium 12 is stacked on the intermediate stacker 32 in the same manner as the previous medium 12. When a predetermined number of media 12 are stacked on the intermediate stacker 32, the post-processing mechanism 33 performs post-processing on the media 12. The predetermined number to be post-processed is the number of copies per unit when the medium 12 is post-processed.

According to the said 3rd Embodiment, in addition to the effect of the said 1st Embodiment and 2nd Embodiment, the following effects can be acquired.
(3-1) In the width direction X, the distance between the pair of region guides 72 is narrower than the distance between the pair of alignment surfaces 60. Therefore, when the next medium 12 is transported in the second transport direction Y2 in a state where the alignment surface 60 and the end of the medium 12 are in contact with each other and the alignment member 52 aligns the medium 12, the next medium 12 is the region guide. 72 to guide. Since the area guide 72 is positioned closer to the conveying belt 29 than the alignment surface 60, the movable area MA of the medium 12 can be narrowed by the area guide 72.

(3-2) A blower 71 that blows air toward the lower surface 12a of the medium 12 is provided. Therefore, the behavior of the medium 12 that is separated from the transport belt 29 can be stabilized.
(Fourth embodiment)
Next, a fourth embodiment of the medium processing apparatus, the post-processing apparatus, and the medium conveying apparatus will be described with reference to the drawings. In addition, this 4th Embodiment differs in the structure of a change mechanism from the case of 1st Embodiment-3rd Embodiment. And since it is substantially the same as 1st Embodiment-3rd Embodiment in another point, the overlapping description is abbreviate | omitted by attaching | subjecting the same code | symbol about the same structure.

  As shown in FIG. 22, the change mechanism 51 includes a movable guide 56 that can rotate around a guide shaft 55 and a guide motor 57 that rotates the guide shaft 55. The movable guide 56 is inserted into the guide shaft 55 and is provided so as to rotate with respect to the guide shaft 55.

  The changing mechanism 51 includes a moving member 74 that can move together with the movable guide 56, and a coil spring 75 provided between the movable guide 56 and the moving member 74. The moving member 74 is fixed to the guide shaft 55 by a screw 76. The moving member 74 rotates integrally with the guide shaft 55 around the guide shaft 55. The movable guide 56 is located between the moving member 74 and the intermediate stacker 32.

  The coil spring 75 pushes the movable guide 56 away from the moving member 74. The movable guide 56 has an engaging portion 56 b that engages with the moving member 74. The moving member 74 has a restricting portion 74a located at a position below the engaging portion 56b in the vertical direction Z and between the engaging portion 56b and the intermediate stacker 32. The restricting portion 74 a engages with the engaging portion 56 b and restricts the movement of the movable guide 56 relative to the moving member 74 in the direction away from the moving member 74.

  As shown in FIG. 23, the changing mechanism 51 may include a lever 78 fixed to the guide shaft 55, a cam 79 that presses the lever 78, and a tension spring 80 that presses the lever 78 against the cam 79. . The cam 79 is, for example, an eccentric cam having a substantially disk shape and having a shaft inserted at a position different from the center. The cam 79 rotates by driving the guide motor 57 and pushes the lever 78 against the force of the tension spring 80.

  When the cam 79 presses the lever 78, the guide shaft 55 and the moving member 74 rotate in the clockwise direction in FIG. The movable guide 56 pushed against the moving member 74 by the coil spring 75 rotates around the guide shaft 55 together with the moving member 74 in a state where the engaging portion 56b is engaged with the restricting portion 74a. That is, the movable guide 56 moves from the first guide position shown in FIG. 22 to the second guide position shown in FIG.

  When the cam 79 releases the pressing of the lever 78, the lever 78 returns to the original position by the force of the tension spring 80. The guide shaft 55 and the moving member 74 rotate counterclockwise in FIG. The movable guide 56 with which the engaging portion 56b engages with the restricting portion 74a moves from the second guide position to the first guide position so that the engaging portion 56b is pushed up by the restricting portion 74a.

Next, the operation of the medium processing apparatus 11 will be described.
As shown in FIG. 22, when the medium 12 is transported in the first transport direction Y1 by the transport roller pair 19, the controller 62 keeps the movable guide 56 at the first guide position shown in FIG. 47 is driven, and the belt motor 40 is driven forward to rotate the conveyor belt 29 in the first rotation direction A1.

  As shown in FIG. 24, when the medium 12 is transported to the transport belt 29, the suction mechanism 38 sucks the upper surface 12b of the medium 12. When the medium 12 is attracted to the suction surface 29a and transported in the first transport direction Y1 by the transport belt 29 rotating in the first rotation direction A1, the movable guide 56 is further away from the intermediate stacker 32 than the suction surface 29a. Located at the first guide position. Therefore, the medium 12 is transported in the first transport direction Y <b> 1 in a state where it is not in contact with the movable guide 56 or along the movable guide 56.

  As shown in FIG. 25, when the detection unit 31 detects the trailing end 12r of the medium 12, the control unit 62 drives the belt motor 40 to rotate forward for a predetermined time, and then temporarily stops driving the belt motor 40.

  As shown in FIG. 26, when the rotation of the transport belt 29 stops, the medium 12 has the rear end 12r positioned downstream of the guide shaft 55 in the first transport direction Y1. The control unit 62 moves the movable guide 56 to the second guide position while the conveyance of the medium 12 is stopped. When the movable guide 56 is located at the second guide position, the size of the movable area MA becomes narrower than when the movable guide 56 is located at the first guide position.

  The movable guide 56 positioned at the first guide position rotates so as to move the tip 56a positioned downstream of the guide shaft 55 in the second transport direction Y2 to the second guide position. Therefore, the movable area MA when the movable guide 56 is located at the second guide position is narrower in the downstream in the second transport direction Y2 than the movable area MA when the movable guide 56 is located at the first guide position.

  As shown in FIG. 27, the control unit 62 rotates the transport belt 29 in the second rotation direction A2 with the movable guide 56 positioned at the second guide position. When the transport belt 29 rotates in the second rotation direction A2, the medium 12 is transported in the second transport direction Y2. The movable guide 56 positioned at the second guide position contacts the upper surface 12b of the medium 12 conveyed in the second conveyance direction Y2, and peels the medium 12 from the suction surface 29a. The medium 12 peeled from the suction surface 29 a by the movable guide 56 is positioned by the rear end 12 r hitting the alignment portion 36 and stacked on the intermediate stacker 32 positioned below the transport belt 29.

  The control unit 62 may keep the movable area MA in a narrow state by positioning the movable guide 56 at the second guide position until the detection unit 31 detects the next medium 12. By narrowing the movable area MA, it is possible to reduce the possibility that the medium 12 is curled while being stacked on the intermediate stacker 32.

  When the medium 12 is not stacked on the intermediate stacker 32, the minimum distance between the movable guide 56 positioned at the second guide position and the intermediate stacker 32 is smaller than the thickness of the medium 12 that can be stacked on the intermediate stacker 32. Therefore, when the thickness of the medium 12 stacked on the intermediate stacker 32 is equal to or greater than the minimum distance between the movable guide 56 and the intermediate stacker 32, the movable guide 56 positioned at the second guide position is not the medium 12 stacked on the intermediate stacker 32. To touch.

  As shown in FIG. 28, when the medium 12 is stacked on the intermediate stacker 32, the area between the medium 12 stacked on the intermediate stacker 32 and the conveyor belt 29, and the medium 12 stacked on the intermediate stacker 32 A region between the movable guide 56 is a movable region MA.

  When the thickness of the medium 12 stacked on the intermediate stacker 32 is equal to or greater than the minimum distance between the movable guide 56 and the intermediate stacker 32, the position where the movable guide 56 contacts the medium 12 stacked on the intermediate stacker 32 is the movable guide 56. The second guide position.

  A portion of the movable guide 56 that contacts the medium 12 is located between the moving member 74 and the intermediate stacker 32. Therefore, when the movable guide 56 and the moving member 74 move so as to approach the intermediate stacker 32 from the first guide position, the movable guide 56 contacts the medium 12 stacked on the intermediate stacker 32 before the moving member 74. When the movable guide 56 that moves from the first guide position to the second guide position contacts the medium 12 stacked on the intermediate stacker 32, the movable guide 56 stops moving at the position in contact with the medium 12.

  The moving member 74 is movable relative to the movable guide 56. The coil spring 75 contracts to allow the moving member 74 to move relative to the movable guide 56. The moving member 74 moves so that the restricting portion 74a moves away from the engaging portion 56b and approaches the intermediate stacker 32.

  The second guide position of the movable guide 56 changes according to the number of media 12 stacked on the intermediate stacker 32. Even when the number of the media 12 stacked on the intermediate stacker 32 changes, the position of the moving member 74 when the movable guide 56 is positioned at the second guide position does not change, and the second guide position of the movable guide 56, The interval between the engaging portion 56b and the restricting portion 74a changes.

  When the medium 12 transported in the second transport direction Y2 comes into contact with the movable guide 56 located at the second guide position, the movable guide 56 is pushed by the medium 12 and moves away from the intermediate stacker 32. That is, the medium 12 transported in the second transport direction Y2 passes between the previously stacked medium 12 and the movable guide 56 so as to push up the movable guide 56, and is stacked on the intermediate stacker 32. .

According to the above embodiment, the following effects can be obtained.
(4-1) The movable guide 56 located at the second guide position can contact the medium 12 stacked on the intermediate stacker 32 and is pushed by the medium 12 conveyed in the second conveyance direction Y2 to be in the intermediate stacker 32. Move away from. Therefore, the second guide position is a position where the movable guide 56 contacts the medium 12 stacked on the intermediate stacker 32, and the second guide position is automatically changed according to the number of media 12 stacked on the intermediate stacker 32. Can be made.

  You may change the said embodiment like the example of a change shown below. You may combine the said embodiment and the following modified example arbitrarily. The configurations included in the following modification examples may be arbitrarily combined.

  The post-processing device 14 may be configured without the urging member 66. For example, the separation flap 65 may be provided with a weight at a position opposite to the side contacting the medium 12 with respect to the flap shaft 67, and the separation flap 65 located at the second flap position may be returned to the first flap position by its own weight. Good. The post-processing device 14 may include a drive source that moves the separation flap 65, such as a solenoid that moves the separation flap 65 and a motor that rotates the flap shaft 67.

  The post-processing device 14 may include a roller that sandwiches the medium 12 between the conveyance belt 29 and rotates following the conveyance of the medium 12. If this roller is a toothed roller having irregularities formed on its peripheral surface, the risk of liquid adhering to the lower surface 12a of the medium 12 printed on both sides being transferred to the roller can be reduced.

  The post-processing device 14 may include a presser that holds the medium 12 stacked on the intermediate stacker 32. The presser is composed of, for example, a plate-like elastic member provided rotatably and a weight provided displaceably. The presser presses the medium 12 stacked on the intermediate stacker 32 when the transport belt 29 rotates in the first rotation direction A1, and moves away from the medium 12 when the transport belt 29 rotates in the second rotation direction A2. Move to.

  The post-processing mechanism 33 includes a punching process for making a hole in the medium 12 as a post-process, a shift process for shifting the medium 12 by discharging it in units, a cutting process for cutting the medium 12, a signature process for folding the medium 12, and a medium 12 Arbitrary processing such as bookbinding processing or collation processing may be performed.

  The adsorption mechanism 38 may adsorb the medium 12 to the conveyance belt 29 by an electrostatic adsorption method that charges the medium 12 and the conveyance belt 29. When the suction mechanism 38 sucks the medium 12 to the transport belt 29 by the electrostatic suction method, the possibility of the medium 12 being damaged can be reduced as compared with the case where the medium 12 is transported by an adhesive belt, for example.

  -In 1st Embodiment and 2nd Embodiment, the post-processing mechanism 33 may be provided with the ventilation part 71. FIG. In 3rd Embodiment, the post-processing mechanism 33 is good also as a structure which is not provided with the ventilation part 71. FIG.

In the first embodiment, the post-processing device 14 may be configured without the moving mechanism 53. That is, the alignment member 52 may not be moved in the width direction X.
In the first embodiment, the alignment member 52 may be configured such that the notch 59 is not formed.

In the first embodiment, the post-processing device 14 may not include the alignment member 52.
In the second embodiment, the post-processing device 14 may include the alignment member 52. The alignment member 52 may be formed with a notch that allows the transport belt 29 to move.

In the first embodiment, the movable guide 56 may be positioned at three or more second guide positions.
In the first embodiment, the second guide position need not be changed. The movable guide 56 may be located at the same second guide position regardless of the number of media 12 stacked on the intermediate stacker 32.

  In the fourth embodiment, the changing mechanism 51 may not include the coil spring 75. The movable guide 56 located at the second guide position may press the medium 12 stacked on the intermediate stacker 32 by its own weight.

  In the fourth embodiment, the moving member 74 may be configured not to include the restricting portion 74a, and the movable guide 56 may be configured not to include the engaging portion 56b. For example, one end of the coil spring 75 may be connected to the moving member 74, the other end of the coil spring 75 may be connected to the movable guide 56, and the moving member 74 may be held so that the movable guide 56 is suspended by the coil spring 75. The change mechanism 51 may connect the moving member 74 and the movable guide 56 with a deformable deformable member different from the coil spring 75.

  The change mechanisms 51 and 69 and the moving mechanism 53 are movable between the transport belt 29 and the intermediate stacker 32 when the medium 12 is transported in the first transport direction Y1 and when transported in the second transport direction Y2. The size of the area MA may be changed over the entire second transport direction Y2, or the upstream size in the second transport direction Y2 may be changed.

  The change mechanisms 51 and 69 may change the movable area MA while the conveyance belt 29 is rotating and the medium 12 is being conveyed. For example, the changing mechanism 51 moves the movable guide after the rear end 12r of the medium 12 transported in the first transport direction Y1 passes through the portion of the suction surface 29a that intersects the movable guide 56 located at the second guide position. 56 may be moved from the first guide position to the second guide position. The change mechanism 51 may move the movable guide 56 from the first guide position to the second guide position while the medium 12 is being transported in the second transport direction Y2. The change mechanism 69 moves the transport belt 29 from the first belt position to the second position while the medium 12 having the rear end 12r sucked on the suction surface 29a is being transported in the first transport direction Y1 or the second transport direction Y2. It may be moved to the belt position.

The medium processing device 11 may be a device that integrally includes the function of the intermediate device 15, the function of the post-processing device 14, and the function of the printing device 13.
The medium processing apparatus 11 may be an apparatus that includes the function of the intermediate apparatus 15 and the function of the post-processing apparatus 14 and the printing apparatus 13.

  The medium processing device 11 may be configured not to include the intermediate device 15 and the post-processing device 14, and may include a transport mechanism 30 and a stacker that stacks the media 12 transported by the transport mechanism 30 in the printing device 13. . The medium processing apparatus 11 may be configured not to include the post-processing mechanism 33. The medium processing apparatus 11 transports the medium 12 recorded by the recording head 27 in the first transport direction Y1 and the second transport direction Y2 by the transport mechanism 30 so that the rear ends 12r of the medium 12 are aligned. You may stack on the stacker with which 13 is provided.

  The liquid can be arbitrarily selected as long as it can be printed on the medium 12 by adhering to the medium 12. The liquid may be in a state in which the substance is in a liquid phase, and is a liquid with high or low viscosity, sol, gel water, other inorganic solvents, organic solvents, solutions, liquid resins, liquid metals. A fluid such as (metal melt) shall be included. Further, not only a liquid as one state of a substance but also a substance in which particles of a functional material made of a solid such as a pigment or a metal particle are dissolved, dispersed or mixed in a solvent is included. A typical example of the liquid is ink. The ink includes general water-based inks and oil-based inks, and various liquid compositions such as gel inks and hot melt inks.

  The medium processing apparatus 11 is an apparatus that prints images such as characters, pictures, and photographs by attaching a liquid such as ink to the medium 12, and may be a serial printer, a lateral printer, a line printer, a page printer, or the like. Good. The printing device 13 may be an offset printing device, a textile printing device, or the like.

  The medium processing apparatus 11 may be a scanner or a copier that includes a reading unit that is an example of a processing unit that reads and processes information recorded on the medium 12. The post-processing device 14 and the medium transport device 28 may transport the medium 12 that has been read by the reading unit and discharged.

  The medium processing apparatus 11 may be a paper manufacturing apparatus including a paper manufacturing unit that is an example of a processing unit that manufactures and processes paper that is an example of a medium. The post-processing device 14 and the medium conveying device 28 may convey the medium that has been produced and discharged by the paper making unit.

Below, the technical idea grasped | ascertained from embodiment mentioned above and the example of a change, and its effect are described.
The medium processing apparatus includes: a processing unit that processes the medium; an adsorption mechanism that adsorbs the medium processed by the processing unit to an annular conveyance belt; and a first rotation direction and the first rotation direction of the conveyance belt. Changes a rotation mechanism that rotates in the opposite second rotation direction, a stacker that stacks the medium conveyed by the conveyor belt, and a region in which the medium can be displaced between the conveyor belt and the stacker. A change mechanism, wherein the suction mechanism sucks a second surface of the medium opposite to the first surface on the stacker side, and the rotation mechanism picks up the transport belt that sucks the medium. The stacker is rotated in one rotation direction to convey the medium in the first conveyance direction, and then the conveyance belt is rotated in the second rotation direction to convey the medium in the second conveyance direction. Is stacked, the change mechanism, said area when conveying the medium to the second conveying direction, is narrower than when conveying the medium in the first transport direction.

  The medium away from the conveyor belt is deformed in an area where the medium can be displaced. Therefore, there is a possibility that the medium is greatly deformed as the area where the medium can be displaced is wider. In this regard, according to this configuration, the change mechanism narrows the region between the transport belt and the stacker when transporting the medium in the second transport direction, compared to transporting the medium in the first transport direction. Therefore, the medium conveyed in the second conveying direction can be prevented from being greatly deformed away from the conveying belt, and the medium can be stacked on the stacker while suppressing the deformation of the medium.

  In the medium processing apparatus, the changing mechanism has a movable guide movable to a first guide position and a second guide position closer to the stacker than the first guide position, and the change mechanism has the second guide position. The movable guide that is positioned may contact the second surface of the medium that is transported in the second transport direction.

  According to this configuration, when the movable guide is positioned at the second guide position that is closer to the stacker than the first guide position, the movable guide contacts the second surface of the medium. Therefore, the medium can be peeled off from the transport belt by the movable guide positioned at the second guide position, and the area where the medium can be displaced can be narrowed.

  In the medium processing apparatus, the second guide position is changed according to the number of the media stacked on the stacker, and the movable position positioned at the second guide position when the number of the stacked media is large. An interval between the guide and the stacker may be larger than an interval between the movable guide and the stacker positioned at the second guide position when the number of stacked media is small.

  According to this configuration, the second guide position of the movable guide changes according to the number of media stacked on the stacker. Therefore, the relationship between the movable guide located at the second guide position and the medium stacked on the stacker can be appropriately maintained.

The medium processing apparatus may include a control unit that controls the second guide position of the movable guide so as to change according to the number of the media stacked on the stacker.
According to this configuration, the second guide position of the movable guide is controlled by the control unit so as to change according to the number of media stacked on the stacker. Therefore, the possibility that the movable guide comes into contact with the medium stacked on the stacker can be reduced.

  In the medium processing apparatus, the movable guide positioned at the second guide position can contact the medium stacked on the stacker, and is pushed by the medium conveyed in the second conveyance direction to be stacked on the stacker. You may move in the direction away from.

  According to this configuration, the movable guide located at the second guide position can come into contact with the medium stacked on the stacker, and is moved by the medium conveyed in the second conveyance direction to move away from the stacker. Therefore, the second guide position is a position where the movable guide comes into contact with the medium stacked on the stacker, and the second guide position can be automatically changed according to the number of media stacked on the stacker.

  The medium processing apparatus further includes a pair of alignment members that align the medium stacked on the stacker in a width direction orthogonal to the first transport direction, and the alignment member aligns the medium with the alignment member. In this operation, a notch that avoids contact with the movable guide located at the second guide position may be formed.

  According to this configuration, the notch is formed in the pair of alignment members of the stacker. Therefore, the possibility that the movable guide located at the second guide position interferes with the alignment member can be reduced.

  In the medium processing apparatus, the transport belt is provided movably between a first belt position and a second belt position closer to the stacker than the first belt position, and the change mechanism is configured to transfer the medium to the medium belt. When transporting in the first transport direction, the transport belt may be positioned at the first belt position, and when transporting the medium in the second transport direction, the transport belt may be positioned at the second belt position. .

  According to this configuration, the changing mechanism positions the transport belt at the first belt position when transporting the medium in the first transport direction, and moves the transport belt from the first belt position when transporting the medium in the second transport direction. Is also positioned at the second belt position close to the stacker. Therefore, the area where the medium can be displaced by the transport belt can be narrowed, and the medium can be stacked on the stacker while the transport belt is close to the stacker, so that the medium can be stacked quickly.

  The medium processing apparatus further includes a pair of alignment members that relatively move in a width direction orthogonal to the first transport direction to align the medium stacked on the stacker, and the alignment member has an end of the medium. A first guide surface to be aligned and a position that is closer to the conveying belt than the first guide surface and guides the first surface side of the medium on the inner side in the width direction than the first guide surface. And a guide surface.

  According to this configuration, in the width direction, the interval between the pair of second guide surfaces is narrower than the interval between the pair of first guide surfaces. Therefore, when the next medium is transported in the second transport direction in a state where the first guide surface and the end of the medium are in contact with each other and the alignment member aligns the medium, the next medium is guided by the second guide surface. The Since the second guide surface is located closer to the conveying belt than the first guide surface, an area where the medium can be displaced can be narrowed by the second guide surface.

The medium processing apparatus may include a blower that blows air toward the first surface of the medium when the medium is transported in the second transport direction.
According to this structure, the ventilation part which ventilates toward the 1st surface of a medium is provided. Therefore, it is possible to stabilize the behavior of the medium away from the conveyance belt.

  In the above-described medium processing apparatus, the suction mechanism may cause the medium to be conveyed to the transport belt by a suction system that sucks air from a hole formed in the transport belt or an electrostatic suction system that charges the medium and the transport belt. It may be adsorbed.

  According to this configuration, the suction mechanism sucks the medium onto the transport belt by the suction method or the electrostatic suction method. Therefore, for example, the possibility that the medium is damaged can be reduced as compared with the case where the medium is conveyed by an adhesive belt.

  The post-processing apparatus includes an adsorption mechanism that adsorbs the discharged medium to an annular conveyance belt, a rotation mechanism that rotates the conveyance belt in a first rotation direction and a second rotation direction opposite to the first rotation direction, An intermediate stacker that stacks the medium transported by the transport belt, a post-processing mechanism that performs post-processing on the medium stacked on the intermediate stacker, and a discharge stacker that stacks the medium sent from the intermediate stacker; A change mechanism that changes a region in which the medium can be displaced between the transport belt and the intermediate stacker, and the suction mechanism is opposite to the first surface of the medium on the intermediate stacker side. The rotation mechanism rotates the conveyance belt that has adsorbed the medium in the first rotation direction to convey the medium in the first direction. The medium is transported in the second transport direction, the medium is transported in the second transport direction and stacked on the intermediate stacker, and the change mechanism is configured to move the medium in the second transport direction. The area when the medium is conveyed is narrower than when the medium is conveyed in the first conveyance direction. According to this configuration, the same effects as those of the medium processing apparatus can be obtained.

  The medium conveyance device includes an adsorption mechanism that adsorbs the discharged medium to an annular conveyance belt, a rotation mechanism that rotates the conveyance belt in a first rotation direction and a second rotation direction opposite to the first rotation direction, A stacker that stacks the medium transported by the transport belt, and a change mechanism that changes a region in which the medium can be displaced between the transport belt and the stacker, and the suction mechanism includes the medium The second surface opposite to the first surface on the stacker side is adsorbed, and the rotating mechanism rotates the conveying belt adsorbing the medium in the first rotating direction to cause the medium to move in the first conveying direction. The transport belt is rotated in the second rotation direction so that the medium is transported in the second transport direction and is stacked on the stacker. Said region when conveyed in the second conveying direction, narrower than when conveying the medium in the first transport direction. According to this configuration, the same effects as those of the medium processing apparatus can be obtained.

  DESCRIPTION OF SYMBOLS 11 ... Medium processing apparatus, 12 ... Medium, 12a ... Lower surface (example of 1st surface), 12b ... Upper surface (example of 2nd surface), 12f ... Front end, 12r ... Rear end, 13 ... Printing device, 14 ... Post-processing Device, 15 ... Intermediate device, 17 ... Conveyance path, 18 ... Conveyance motor, 19 ... Conveyance roller pair, 21 ... Cassette, 22 ... Pickup roller, 23 ... Separation roller, 25 ... Supporting part, 26 ... Nozzle, 27 ... Recording head (An example of a processing unit), 28 ... a medium conveying device, 29 ... a conveying belt, 29a ... an adsorption surface, 29b ... an inner surface, 30 ... a conveying mechanism, 31 ... a detection unit, 32 ... an intermediate stacker (an example of a stacker), 33 ... after Processing mechanism 34 ... Discharge stacker 36 ... Alignment part 37 ... Rotation mechanism 38 ... Suction mechanism 40 ... Belt motor 41 ... Drive pulley 42 ... Pulse driven pulley 44 ... Suction chamber 45 ... Suction , 46 ... duct, 47 ... fan, 49 ... hole, 51 ... changing mechanism, 52 ... alignment member, 53 ... moving mechanism (an example of changing mechanism), 55 ... guide shaft, 56 ... movable guide, 56a ... tip, 56b ... Engagement part, 57 ... guide motor, 59 ... notch, 59a ... first end, 59b ... second end, 60 ... alignment surface (an example of the first guide surface), 61 ... projection part, 62 ... control part, 63 ... Time measuring part, 65 ... Separation flap, 65a ... Flap upper surface, 65b ... Flap lower surface, 66 ... Biasing member, 67 ... Flap shaft, 69 ... Change mechanism, 71 ... Blower part, 72 ... Area guide (of second guide surface) (Example), 74 ... Moving member, 74a ... Restriction part, 75 ... Coil spring, 76 ... Screw, 78 ... Lever, 79 ... Cam, 80 ... Tension spring, A1 ... First rotation direction, A2 ... Second rotation direction, MA ... movable area (example of area), ... width direction, Y1 ... first conveying direction, Y2 ... second conveying direction, Z ... vertical direction.

Claims (12)

A processing unit for processing the medium;
An adsorption mechanism for adsorbing the medium processed by the processing unit to an annular conveyance belt;
A rotation mechanism for rotating the transport belt in a first rotation direction and a second rotation direction opposite to the first rotation direction;
A stacker for stacking the medium transported by the transport belt;
A change mechanism for changing a region in which the medium can be displaced between the transport belt and the stacker;
With
The suction mechanism sucks a second surface of the medium opposite to the first surface on the stacker side,
The rotation mechanism rotates the conveyance belt that has adsorbed the medium in the first rotation direction to convey the medium in the first conveyance direction, and then rotates the conveyance belt in the second rotation direction to rotate the medium. Is transported in the second transport direction and stacked on the stacker,
The medium processing apparatus is characterized in that the change mechanism narrows the area when the medium is transported in the second transport direction as compared to when the medium is transported in the first transport direction. The change mechanism has a movable guide movable to a first guide position and a second guide position closer to the stacker than the first guide position,
The medium processing apparatus according to claim 1, wherein the movable guide positioned at the second guide position contacts the second surface of the medium conveyed in the second conveyance direction. The second guide position changes according to the number of the media stacked on the stacker,
The distance between the movable guide positioned at the second guide position when the number of stacked media is large and the stacker is positioned at the second guide position when the number of stacked media is small. The medium processing apparatus according to claim 2, wherein an interval between the movable guide and the stacker is larger.   The medium processing apparatus according to claim 3, further comprising a control unit configured to control the second guide position of the movable guide so as to change according to the number of the media stacked on the stacker.   The movable guide located at the second guide position can contact the medium stacked on the stacker, and moves in a direction away from the stacker by being pushed by the medium conveyed in the second conveyance direction. The medium processing apparatus according to claim 3. A pair of alignment members that align the medium stacked on the stacker in a width direction perpendicular to the first transport direction;
3. The notch for avoiding contact with the movable guide located at the second guide position in the aligning member for aligning the medium with the aligning member. The medium processing apparatus according to claim 5. The transport belt is provided movably between a first belt position and a second belt position closer to the stacker than the first belt position;
The change mechanism is:
When transporting the medium in the first transport direction, the transport belt is positioned at the first belt position,
The medium processing apparatus according to claim 1, wherein when the medium is transported in the second transport direction, the transport belt is positioned at the second belt position. A pair of alignment members for aligning the medium stacked on the stacker by moving relative to the width direction orthogonal to the first transport direction;
The alignment member is
A first guide surface that aligns the widthwise ends of the medium;
A second guide surface that is positioned closer to the conveyor belt than the first guide surface and guides the first surface side of the medium on the inner side in the width direction than the first guide surface;
The medium processing apparatus according to claim 1, further comprising:   The medium processing apparatus according to claim 8, further comprising a blower that blows air toward the first surface of the medium when the medium is transported in the second transport direction.   The attracting mechanism attracts the medium to the transport belt by a suction system that sucks air from a hole formed in the transport belt or an electrostatic suction system that charges the medium and the transport belt. The medium processing apparatus according to any one of claims 1 to 9. An adsorption mechanism for adsorbing the discharged medium to an annular conveyance belt;
A rotation mechanism for rotating the transport belt in a first rotation direction and a second rotation direction opposite to the first rotation direction;
An intermediate stacker for stacking the medium transported by the transport belt;
A post-processing mechanism for performing post-processing on the medium stacked on the intermediate stacker;
A discharge stacker for stacking the medium sent out from the intermediate stacker;
A change mechanism for changing a region in which the medium can be displaced between the transport belt and the intermediate stacker;
With
The suction mechanism sucks a second surface of the medium opposite to the first surface on the intermediate stacker side,
The rotation mechanism rotates the conveyance belt that has adsorbed the medium in the first rotation direction to convey the medium in the first conveyance direction, and then rotates the conveyance belt in the second rotation direction to rotate the medium. Is transported in the second transport direction and stacked on the intermediate stacker,
The post-processing apparatus is characterized in that the change mechanism narrows the area when the medium is transported in the second transport direction as compared to when the medium is transported in the first transport direction. An adsorption mechanism for adsorbing the discharged medium to an annular conveyance belt;
A rotation mechanism for rotating the transport belt in a first rotation direction and a second rotation direction opposite to the first rotation direction;
A stacker for stacking the medium transported by the transport belt;
A change mechanism for changing a region in which the medium can be displaced between the transport belt and the stacker;
With
The suction mechanism sucks a second surface of the medium opposite to the first surface on the stacker side,
The rotation mechanism rotates the conveyance belt that has adsorbed the medium in the first rotation direction to convey the medium in the first conveyance direction, and then rotates the conveyance belt in the second rotation direction to rotate the medium. Is transported in the second transport direction and stacked on the stacker,
The change mechanism is characterized in that the area when the medium is transported in the second transport direction is narrower than when the medium is transported in the first transport direction.

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