Media conveyance mechanism

Abstract

The present invention provides a medium conveyance mechanism that facilitates the operation of removing a medium when the conveyance of the medium by a conveyance unit disposed above the medium is stopped. An inspection device as an example of the medium conveyance mechanism includes: a first conveyance unit that is disposed above the medium and adsorbs and conveys the medium; a first lifting unit (e.g., a suspension line, a first drive unit, etc.) that raises and lowers the first conveyance unit between a conveyance position for conveying the medium and a standby position above the conveyance position; and a control unit that, when the conveyance of the medium by the first conveyance unit is stopped, controls the first lifting unit to raise the first conveyance unit to the standby position and controls the first conveyance unit to release the adsorption of a part of the medium (e.g., a second medium).

Description

Technical Field

[0001] The present invention relates to a medium conveying mechanism for conveying a medium. Background Art

[0002] Conventionally, an inspection device has been proposed, which includes: a conveying unit disposed above a medium for adsorbing and conveying the medium; and an inspection unit disposed below the medium facing the conveying unit for inspecting the medium, wherein the inspection unit is configured to face the upstream end of the conveying unit to easily remove the medium (for example, refer to Patent Document 1).

[0003] Prior Art Documents

[0004] Patent Documents

[0005] Patent Document 1: Japanese Patent Application Laid-Open No. 2020-032634 Summary of the Invention

[0006] Problems to be Solved by the Invention

[0007] In addition, as described above, when paper jams occur or the like, the conveying unit disposed above the medium stops conveying the medium and rises to an upper standby position from the conveying position to release the paper jam.

[0008] After the conveyance of the medium stops, if the adsorption of the medium is maintained when the conveying unit is in the standby position, in the case of a particularly small medium, the entire surface of the medium is adsorbed to the conveying unit, so that the user cannot find the medium when releasing the paper jam or the like. On the other hand, after the conveyance of the medium stops, if the adsorption of the medium is released when the conveying unit is in the standby position, the medium will fall and the position of the medium will easily become unclear. In these states, the usability for the user is poor and dissatisfaction of the user is likely to occur.

[0009] An object of the present invention is to provide a medium conveying mechanism that can easily perform an operation of removing a medium when the conveyance of the medium by a conveying unit disposed above the medium stops.

[0010] Solutions to the Problems

[0011] In one aspect, the medium conveying mechanism includes: a first conveying unit disposed above the medium for adsorbing and conveying the medium; a first lifting unit for lifting and lowering the first conveying unit between a conveying position for conveying the medium and a standby position above the conveying position; and a control unit that, when the conveyance of the medium by the first conveying unit stops, controls the first lifting unit to lift the first conveying unit to the standby position and controls the first conveying unit to release the adsorption of a part of the medium.

[0012] Effect of the Invention

[0013] According to the above manner, when the conveyance of the medium by the conveyance unit disposed above the medium stops, the operation of removing the medium can be easily performed. Description of the Drawings

[0014] Figure 1 It is a diagram showing the internal structure of a printing system in one embodiment.

[0015] Figure 2 It is a diagram showing the control structure of a part of a printing system in one embodiment.

[0016] Figure 3 It is a rear side perspective view showing an inspection device (conveyance state) according to one embodiment.

[0017] Figure 4 It is a rear side perspective view showing an inspection device (paper jam release state) according to one embodiment.

[0018] Figure 5 It is a front view for explaining the lifting operation (conveyance position) of the first conveyance unit and the second conveyance unit of the inspection device according to one embodiment.

[0019] Figure 6 It is a front view for explaining the lifting operation (standby position) of the first conveyance unit and the second conveyance unit of the inspection device according to one embodiment.

[0020] Figure 7 It is a table showing an example of the ON / OFF state of each fan corresponding to the size of the medium at the time of paper jam release in one embodiment.

[0021] Figure 8A It is a front view (one of them) showing the state of the medium when the first conveyance unit and the second conveyance unit of the inspection device according to one embodiment are in the conveyance position.

[0022] Figure 8B It is a front view (one of them) showing the state of the medium when the first conveyance unit and the second conveyance unit of the inspection device according to one embodiment are in the standby position.

[0023] Figure 9A It is a front view (the other one) showing the state of the medium when the first conveyance unit and the second conveyance unit of the inspection device according to one embodiment are in the conveyance position.

[0024] Figure 9BThis is a front view (part 2) showing the state of the medium when the first conveying unit and the second conveying unit of the inspection device according to one embodiment are in the standby position.

[0025] Figure 10A This is a front view (part 3) showing the state of the medium when the first conveying unit and the second conveying unit of the inspection device according to one embodiment are in the conveying position.

[0026] Figure 10B This is a front view (part 3) showing the state of the medium when the first conveying unit and the second conveying unit of the inspection device according to one embodiment are in the standby position.

[0027] Figure 11A This is a front view (part 4) showing the state of the medium when the first conveying unit and the second conveying unit of the inspection device according to one embodiment are in the conveying position.

[0028] Figure 11B This is a front view (part 4) showing the state of the medium when the first conveying unit and the second conveying unit of the inspection device according to one embodiment are in the standby position.

[0029] Figure 12A This is a front view (part 5) showing the state of the medium when the first conveying unit and the second conveying unit of the inspection device according to one embodiment are in the conveying position.

[0030] Figure 12B This is a front view (part 5) showing the state of the medium when the first conveying unit and the second conveying unit of the inspection device according to one embodiment are in the standby position.

[0031] Figure 13A This is a front view (part 6) showing the state of the medium when the first conveying unit and the second conveying unit of the inspection device according to one embodiment are in the conveying position.

[0032] Figure 13B This is a front view (part 6) showing the state of the medium when the first conveying unit and the second conveying unit of the inspection device according to one embodiment are in the standby position. Detailed Embodiment

[0033] Next, taking the inspection device 1 as an example, a medium conveying mechanism according to one embodiment of the present invention will be described with reference to the accompanying drawings.

[0034] Figure 1 This is a diagram showing the internal structure of the printing system 100 in the present embodiment.

[0035] Figure 2 This is a diagram showing the control structure of a part of the printing system 100.

[0036] In addition, Figure 1 , the following Figures 3 - 6 and Figures 8A - 13B The up-down direction, left-right direction, and front-back direction shown are for ease of explanation only. For example, the up-down direction is the vertical direction, and the left-right direction and front-back direction are the horizontal directions.

[0037] As Figure 1 and Figure 2 shown, the printing system 100 includes a medium supply device 110, a first printing device 120, an intermediate conveyance device 130, a second printing device 140, an inspection device 1, and a medium discharge device 150. Here, the inspection device 1 is an example of a medium conveyance mechanism for conveying the medium M. This medium conveyance mechanism is not limited to the inspection device 1, as long as it conveys the medium M. In addition, the medium M is, for example, paper (cut paper), but may also be other sheet-like media such as a film.

[0038] The medium supply device 110, the first printing device 120, the intermediate conveyance device 130, the second printing device 140, the inspection device 1, and the medium discharge device 150 are arranged in series on the conveyance path (conveyance direction D) of the medium M. In addition, a plurality of the devices among the medium supply device 110, the first printing device 120, the intermediate conveyance device 130, the second printing device 140, the inspection device 1, and the medium discharge device 150 may be integrally arranged in a common housing. For example, the medium discharge device 150 may be arranged as a part of the inspection device 1. In this way, the inspection device 1 integrally having the medium discharge device 150 can be regarded as both an inspection device (medium conveyance mechanism) and an inspection system (medium conveyance system). In addition, the printing system 100 only needs to include at least one printing unit (for example, the first printing unit 122 of the first printing device 120 and the second printing unit 142 of the second printing device 140 described later), and the inspection device 1 (medium conveyance mechanism).

[0039] In Figure 1 , only the first supply path R1, the second supply path R2, the merging path R3, the straight-through path R6, and the housing paths R8 to R11 of the medium M are shown by solid lines, the straight-through path R4 is shown by a dashed line (flipped part) and a solid line, and the circulation paths R5 and R7 are shown by a dashed line (flipped part) and a double-dashed line.

[0040] The medium supply device 110 has a first supply unit 111, a second supply unit 112 arranged below the first supply unit 111, and a plurality of conveyance roller pairs 113 that grip and convey the medium M.

[0041] The first supply unit 111 includes: a stack table 111a that can be lifted and lowered for stacking the medium M; and an adsorption and conveyance unit 111b that adsorbs and conveys the uppermost medium M stacked on the stack table 111a for conveyance. The second supply unit 112 includes: a stack table 112a that can be lifted and lowered for stacking the medium M; and an adsorption and conveyance unit 112b that adsorbs and conveys the uppermost medium M stacked on the stack table 112a for conveyance.

[0042] The first supply path R1 of the medium M supplied from the first supply unit 111 and the second supply path R2 of the medium M supplied from the second supply unit 112 merge at the merge path R3.

[0043] The first printing device 120 includes: a plurality of conveyance roller pairs 121 that clamp and convey the medium M; a first printing unit 122 that prints on the medium M; an adsorption and conveyance unit 123 that is disposed opposite to the first printing unit 122 for adsorbing and conveying the medium M; conveyance path switching units 124, 125 for switching the conveyance path of the medium M; a switchback roller pair 126 that flips the front and back of the medium M; and a discharge tray 127 for placing the medium M that is not conveyed to the intermediate conveyance device 130.

[0044] One of the conveyance path switching units 124 is, for example, a fin-shaped member for switching the conveyance path (merge path R3) of the medium M printed by the first printing unit 122 to a straight-through path R4 leading to the intermediate conveyance device 130 and a circulation path R5 leading to the discharge tray 127 and the switchback roller pair 126.

[0045] The other conveyance path switching unit 125 is, for example, a fin-shaped member for switching the conveyance path of the medium M on the circulation path R5 to a conveyance path leading to the discharge tray 127 and a conveyance path leading to the switchback roller pair 126. In addition, the medium M with its front and back flipped at the switchback roller pair 126 is conveyed back to the first printing unit 122 again.

[0046] The intermediate conveyance device 130 includes a plurality of conveyance roller pairs 131 that clamp and convey the medium M, a switchback roller pair 132 that flips the front and back of the medium M, and a flip housing portion 133 disposed inside the flip path where the switchback roller pair 132 is disposed.

[0047] The structure of the second printing device 140 can be set to be the same as the structure of the first printing device 120. The second printing device 140 includes a plurality of conveyance roller pairs 141, a second printing unit 142, an adsorption and conveyance unit 143, conveyance path switching units 144, 145, a switchback roller pair 146, and a discharge tray 147.

[0048] The conveyance path switching unit 144 on one side is, for example, a fin-shaped member for switching the conveyance path (straight-through path R4) of the medium M printed by the second printing unit 142 to the straight-through path R6 leading to the inspection device 1 and the circulation path R7 leading to the discharge tray 147 and the turning roller pair 146.

[0049] The conveyance path switching unit 145 on the other side is, for example, a fin-shaped member for switching the conveyance path of the medium M on the circulation path R7 to the conveyance path leading to the discharge tray 147 and the conveyance path leading to the turning roller pair 146. In addition, the medium M with its front and back surfaces flipped at the turning roller pair 146 is conveyed again to the second printing unit 142.

[0050] The inspection device 1 will be described in detail later. Here, the first conveyance unit 10, the first inspection unit 20, the second conveyance unit 30, and the second inspection unit 40 will be described.

[0051] The first conveyance unit 10 is disposed above the medium M and is configured to adsorb and convey the medium M. The first conveyance unit 10, for example, includes: a plurality of fans for sucking air (for example, Figure 2 and Figure 4 the downstream front fan 11 and the downstream rear fan 12 shown); and a belt on which a plurality of through holes are formed for the air sucked by these plurality of fans to pass through, and the belt is used to convey the medium M adsorbed by sucking air.

[0052] The first inspection unit 20 is disposed below the first conveyance unit 10 so as to face the first conveyance unit 10 in the vertical direction. The image printed on the lower surface of the medium M being conveyed by the first conveyance unit 10 is inspected. For example, the first inspection unit 20 includes an imaging unit such as a CIS (Contact Image Sensor) that captures the image printed on the medium M. In addition, the first inspection unit 20 is an example of the first processing unit for processing the medium M. As other examples of the first processing unit, there are listed a function printing unit that performs function printing using special ink (invisible ink, MICR (Magnetic ink character recognition) ink, etc.) as an example of processing, a printing unit that performs printing using normal ink (ink of KCMY colors, etc.) as an example of processing, a drying heater that performs drying as an example of processing, and the like.

[0053] The second conveying unit 30 is arranged at a position upstream of the first conveying unit 10 in the conveying direction D, and is arranged on the lower side of the medium M, which is the side opposite to the first conveying unit 10 in the up-and-down direction with respect to the medium M. It can be set that the second conveying unit 30 is formed by turning the first conveying unit 10 upside down. For example, similar to the first conveying unit 10, the second conveying unit 30 has, for example: a plurality of fans for sucking air (for example, Figure 2 and Figure 4 the upstream front fan 31 and the upstream rear fan 32 shown); and a belt, on which a plurality of through holes through which the air sucked by these fans passes are formed, and this belt is used to convey the medium M adsorbed by sucking air.

[0054] The second inspection unit 40 is arranged above the medium M, which is the side opposite to the first inspection unit 20 in the up-and-down direction with respect to the medium M, so as to face the second conveying unit 30 in the up-and-down direction. The second inspection unit 40 inspects the image printed on the upper surface of the medium M being conveyed by the second conveying unit 30. For example, the second inspection unit 40 has an imaging unit such as a CIS that captures the image printed on the medium M. In addition, the second inspection unit 40 is an example of a second processing unit that processes the medium M. As other examples of this second processing unit, similar to the first processing unit, there are listed a function printing unit that performs function printing using special ink as an example of processing, a printing unit that performs printing using normal ink as an example of processing, a drying heater that performs drying as an example of processing, and the like.

[0055] In addition, in the present embodiment, the case where the second conveying unit 30 and the second inspection unit 40 (second processing unit) are arranged upstream of the first conveying unit 10 and the first inspection unit 20 (first processing unit) in the conveying direction D is taken as an example for description, but the second conveying unit 30 and the second inspection unit 40 may also be arranged at a position downstream of the first conveying unit 10 and the first inspection unit 20 in the conveying direction D.

[0056] The images captured by the imaging units of the first inspection unit 20 and the second inspection unit 40 are subjected to image processing by a control unit 91 described later or a control unit (not shown) of the entire printing system 100 to determine whether the image printed on the medium M is normal or abnormal. For example, it is only necessary to determine whether the image is normal or abnormal based on the printing accuracy compared with the original data for printing, whether there are errors in the printed content, etc. In addition, the first inspection unit 20 and the second inspection unit 40 may each have a plurality of imaging units with different imaging methods.

[0057] The medium discharge device 150 includes an introduction unit 151, a first normal storage unit 152, an upper conveyance unit 153, an intermediate conveyance unit 154, a second normal storage unit 155, an abnormal storage unit 156, a plurality of conveyance roller pairs 157, and conveyance path switching units 158 and 159.

[0058] The plurality of conveyance roller pairs 157 grip and convey the medium M in each unit such as the introduction unit 151. A conveyance path switching unit 158 is disposed inside the introduction unit 151.

[0059] The conveyance path switching unit 158 is, for example, a fin-shaped member that switches the straight-through path R6 from the second printing device 140 passing through the inspection device 1 and leading to the introduction unit 151 to a storage path R8 leading to the first normal storage unit 152 and a storage path R9 leading to the second normal storage unit 155 and the abnormal storage unit 156.

[0060] The first normal storage unit 152 and the second normal storage unit 155 store the medium M with normal inspection results. The second normal storage unit 155 is disposed at a position downstream of the first normal storage unit 152 in the conveyance direction D. The first normal storage unit 152 has a liftable placement table 152a for placing the medium M, and the second normal storage unit 155 has a liftable placement table 155a for placing the medium M. In addition, the first normal storage unit 152 and the second normal storage unit 155 convey the medium M to the other when, for example, one of them has stored the medium M up to the storage capacity, or when the medium M is being taken out from one of them, or when the type of the medium M is changed.

[0061] The abnormal storage unit 156 stores the medium M with abnormal inspection results and the medium M that has not been inspected when the conveyance of the medium M has stopped due to paper jam or the like. The abnormal storage unit 156 is disposed above the second normal storage unit 155. A plurality of abnormal storage units 156 may be provided.

[0062] The upper conveyance unit 153 is located above the first normal storage unit 152. A storage path R9 leading to the second normal storage unit 155 and the abnormal storage unit 156 is provided in the upper conveyance unit 153.

[0063] The conveyance path switching unit 159 is, for example, a fin-shaped member disposed at the downstream end in the conveyance direction D inside the upper conveyance unit 153. The conveyance path switching unit 159 switches the storage path R9 leading to the second normal storage unit 155 and the abnormal storage unit 156 to a storage path R10 leading to the second normal storage unit 155 and a storage path R11 leading to the abnormal storage unit 156. In addition, the conveyance path switching unit 159 may be disposed in the intermediate conveyance unit 154.

[0064] The intermediate conveyance unit 154 is disposed between the first normal storage unit 152 and the upper conveyance unit 153 on one hand, and the second normal storage unit 155 and the abnormal storage unit 156 on the other hand. An accommodation path R10 leading to the second normal storage unit 155 and an accommodation path R11 leading to the abnormal storage unit 156 are provided in the intermediate conveyance unit 154.

[0065] Next, the structure of the inspection apparatus 1 will be described.

[0066] Figure 3 FIG. is a rear-side perspective view showing the inspection apparatus 1 (conveying state).

[0067] Figure 4 FIG. is a rear-side perspective view showing the inspection apparatus 1 (paper jam release state).

[0068] In addition, Figure 3 and Figure 4 different from Figure 1 , the following-described Figure 5 , Figure 6 and Figures 8A - 13B , the first conveyance unit 10, the first inspection unit 20, the second conveyance unit 30, and the second inspection unit 40 are shown in detail.

[0069] As Figure 3 shown, the inspection apparatus 1 includes the above-described first conveyance unit 10, first inspection unit 20, second conveyance unit 30, second inspection unit 40, suspension lines 51 to 54, pulling lines 61 to 64, first drive unit 71, power transmission unit 72, drive shafts 73, 74, pulleys 75 to 78, second drive unit 81, power transmission unit 82, drive shaft 83, and pulley 84.

[0070] In addition, although omitted in Figure 3 , as Figure 2 shown, the inspection apparatus 1 includes a control unit 91, a storage unit 92, an interface unit 93, contact switches 97, 98, a lower first position detection sensor S11, a lower second position detection sensor S12, an upper first position detection sensor S21, and an upper second position detection sensor S22.

[0071] In addition, although omitted in Figure 3 , as described later in Figure 5 and Figure 6 shown, the inspection apparatus 1 includes a pulley 85, an upstream guide pair 94, an intermediate guide pair 95, and a downstream guide pair 96.

[0072] Figure 3The suspension lines 51 to 54 shown suspend the first transfer unit 10 and the second transfer unit 30 by connecting one end to, for example, the four corners of the first transfer unit 10 and the other end to, for example, the four corners of the second transfer unit 30. The suspension lines 51 to 54 are an example of a flexible suspension member.

[0073] The pulling lines 61 to 64 are connected to, for example, the four corners of the first transfer unit 10 and pull the first transfer unit 10 downward. The pulling lines 61 to 64 are an example of a flexible pulling member.

[0074] In addition, the suspension member exemplified by the suspension lines 51 to 54 and the pulling member exemplified by the pulling lines 61 to 64 are not limited to being linear, and may be in the form of a belt or the like. Further, the material and the number of strands are not particularly limited.

[0075] The first drive unit 71 is used to drive the suspension lines 51 to 54. The first drive unit 71 is, for example, an actuator such as a motor.

[0076] The power transmission unit 72 transmits the power generated by the first drive unit 71 to the two drive shafts 73 and 74, respectively. In addition, as Figure 3 and Figure 4 shown, the power transmission unit 72 is, for example, a plurality of gears, but may also be, as Figure 5 and Figure 6 shown, a plurality of belts or the like.

[0077] The drive shafts 73 and 74 are arranged above the second inspection unit 40 so as to extend in the front-rear direction. Two of the suspension lines 51 and 53 are hung on one of the drive shafts 73, and the remaining two suspension lines 52 and 54 are hung on the other drive shaft 74.

[0078] The pulleys 75 to 78 are arranged above the connection positions where the suspension lines 51 to 54 are connected to the first transfer unit 10, and the suspension lines 51 to 54 are hung on the pulleys 75 to 78.

[0079] Therefore, the drive shafts 73 and 74 rotate by the power transmitted from the power transmission unit 72, whereby the suspension lines 51 to 54 can lower the first transfer unit 10 to the transfer position P1 where it contacts the first inspection unit 20 and raise the second transfer unit 30 to the transfer position P1 where it contacts the second inspection unit 40, and can raise the first transfer unit 10 to the standby position P2 where it is separated from the first inspection unit 20 and lower the second transfer unit 30 to the standby position P2 where it is separated from the second inspection unit 40, as Figure 3 shown. Figure 4 shown.

[0080] The second drive unit 81 is used to drive the pulling lines 61 to 64. The second drive unit 81 is, for example, an actuator such as a motor.

[0081] The power transmission unit 82 transmits the power generated by the second drive unit 81 to the drive shaft 83. In addition, the power transmission unit 82 has gears, for example, but may also have a belt as shown in Figure 5 and Figure 6 .

[0082] The drive shaft 83 is arranged behind the first inspection unit 20 so as to extend in the left - right direction, and the pulling lines 61 - 64 are hung on the drive shaft 83. In addition, the orientation of the drive shaft 83 can be set to any direction. For example, in Figure 5 and Figure 6 , the drive shaft 83 is shown as extending in the front - rear direction.

[0083] The pulling line 62 connected to the right front part of the first conveying unit 10 is hung on the pulley 84. In addition, in Figure 3 and Figure 4 , the pulley on which the pulling line 61 connected to the left front part of the first conveying unit 10 is hung is not shown, but is, for example, the pulley 85 as shown in Figure 5 and Figure 6 .

[0084] The drive shaft 83 rotates by the power transmitted from the power transmission unit 82, whereby the pulling lines 61 - 64 can lower the first conveying unit 10.

[0085] In addition, since the second drive unit 81 uses the pulling lines 61 - 64 to pull the first conveying unit 10 downward, the second conveying unit 30 connected to the first conveying unit 10 by the suspension lines 51 - 54 can be lifted. Therefore, for example, if the structure of arranging a counterweight in the second conveying unit 30 etc. enables the suspension lines 51 - 54 to move in a state where the drive of the second drive unit 81 is stopped so as to lower the second conveying unit 30 and lift the first conveying unit 10, the first drive unit 71 can be omitted.

[0086] The above - mentioned suspension lines 51 - 54, pulling lines 61 - 64, first drive unit 71, second drive unit 81, etc. function as an example of a first lifting unit that raises and lowers the first conveying unit 10 between the conveying position P1 of the conveying medium M and the standby position above the conveying position P1, and also function as an example of a second lifting unit that raises and lowers the second conveying unit 30 between the conveying position P1 of the conveying medium M and the standby position P2 below the conveying position P1. As the first and second lifting units, it is not limited to using the pulling lines 61 - 64, etc., and for example, it can also be a device that raises and lowers the first conveying unit 10 and the second conveying unit 30 along a guide member, etc.

[0087] Figure 2The control unit 91 shown has a processor (e.g., CPU: Central Processing Unit) that functions as an arithmetic processing device, and controls each part of the inspection device 1 such as the first conveyance unit 10 and the second conveyance unit 30. In addition, a control unit (not shown) of the printing system 100 may also serve as the control unit 91.

[0088] The storage unit 92 has, for example, a read-only semiconductor memory (ROM: Read Only Memory) in which a predetermined control program is pre-recorded, and a semiconductor memory (RAM: Random Access Memory) that can be written to and read from at any time and is used as a working storage area as needed when the processor executes various control programs.

[0089] The interface unit 93 transmits various information to and from external devices. For example, the interface unit 93 sends the inspection results of the medium M to the first printing device 120, the second printing device 140, the medium discharge device 150, etc.

[0090] As Figure 5 and Figure 6 shown, the upstream guide pair 94 is arranged at a position upstream of the second conveyance unit 30 in the conveyance direction D, and is used to guide the medium M.

[0091] The middle guide pair 95 is arranged between the second conveyance unit 30 and the first conveyance unit 10 in the conveyance direction D, and is used to guide the medium M.

[0092] The downstream guide pair 96 is arranged at a position downstream of the first conveyance unit 10 in the conveyance direction D, and is used to guide the medium M.

[0093] The upstream guide pair 94, the middle guide pair 95, and the downstream guide pair 96 are, for example, two upper and lower plates respectively.

[0094] For example, a total of four contact switches 97 are arranged at positions where they can contact the four corners of the second conveyance unit 30 at the conveyance position P1, and the fact that the second conveyance unit 30 is at the conveyance position P1 is detected by contacting the second conveyance unit 30.

[0095] For example, a total of four contact switches 98 are arranged at positions where they can contact the four corners of the first conveyance unit 10 at the conveyance position P1, and the fact that the first conveyance unit 10 is at the conveyance position P1 is detected by contacting the first conveyance unit 10.

[0096] The lower first position detection sensor S11 detects the second conveyance unit 30 at an intermediate position between the conveyance position P1 and the standby position P2.

[0097] The lower second position detection sensor S12 detects Figure 6 the second transfer unit 30 at the standby position P2 shown.

[0098] The upper first position detection sensor S21 detects the first transfer unit 10 at an intermediate position between the transfer position P1 and the standby position P2.

[0099] The upper second position detection sensor S22 detects Figure 6 the first transfer unit 10 at the standby position P2 shown.

[0100] In addition, it is preferable that a plurality of each of the lower first position detection sensor S11, the lower second position detection sensor S12, the upper first position detection sensor S21, and the upper second position detection sensor S22 are arranged at the same height.

[0101] Next, with reference to Figure 5 and Figure 6 the lifting actions of the first transfer unit 10 and the second transfer unit 30 will be described.

[0102] Figure 5 is a front view for explaining the lifting actions (transfer position P1) of the first transfer unit 10 and the second transfer unit 30.

[0103] Figure 6 is a front view for explaining the lifting actions (standby position P2) of the first transfer unit 10 and the second transfer unit 30.

[0104] In addition, in Figure 5 and Figure 6 the suspension line 53 is hidden due to overlapping with the suspension line 51 and is not shown, and the suspension line 54 is hidden due to overlapping with the suspension line 52 and is not shown, but the reference numerals of the suspension lines 53 and 54 are recorded together with the reference numerals of the suspension lines 51 and 52. Similarly, in Figure 5 and Figure 6 the pulling line 63 is hidden due to overlapping with the pulling line 61 and is not shown, and the pulling line 64 is hidden due to overlapping with the pulling line 62 and is not shown, but the reference numerals of the pulling lines 63 and 64 are recorded together with the reference numerals of the pulling lines 61 and 62.

[0105] First, as in Figure 5As shown in the figure, in order to move the first conveying unit 10 and the second conveying unit 30 to the conveying position P1, starting from the state where the lower first position detection sensor S11 detects the upper end of the second conveying unit 30 at the above-mentioned intermediate position and the upper first position detection sensor S21 detects the lower end of the first conveying unit 10 at the above-mentioned intermediate position, the first driving unit 71 drives the suspension lines 51 to 54 by a predetermined amount, thereby lowering the first conveying unit 10 and raising the second conveying unit 30.

[0106] Thus, as Figure 5 shown in the figure, the first conveying unit 10 moves to the conveying position P1 in contact with the first inspection unit 20, and the second conveying unit 30 moves to the conveying position P1 in contact with the second inspection unit 40. By doing so, it is possible to reliably bring the four corners of the first conveying unit 10 into contact with the first inspection unit 20 and the four corners of the second conveying unit 30 into contact with the second inspection unit 40. Here, in the state where the first conveying unit 10 is in contact with the first inspection unit 20 and the second conveying unit 30 is in contact with the second inspection unit 40, it is preferable that the suspension lines 51 to 54 have slack. On the other hand, the pulling lines 61 to 64 pull the first conveying unit 10 downward in order to bring the first conveying unit 10 into contact with the first inspection unit 20, so they do not have slack.

[0107] Next, when separating the first conveying unit 10 and the second conveying unit 30 from the first inspection unit 20 or the second inspection unit 40, first, the control unit 91 controls the second driving unit 81 to unwind the pulling lines 61 to 64 to form slack, and then controls the first driving unit 71 to delay the raising of the first conveying unit 10 using the suspension lines 51 to 54. Thus, the first conveying unit 10 is raised after the pulling lines 61 to 64 are slack.

[0108] As Figure 6 shown in the figure, when the first conveying unit 10 rises in a manner of separating from the first inspection unit 20 and the second conveying unit 30 descends in a manner of separating from the second inspection unit 40, the lower second position detection sensor S12 detects the upper end of the second conveying unit 30, and the upper second position detection sensor S22 detects the lower end of the first conveying unit 10. At this time, the first conveying unit 10 and the second conveying unit 30 are located at the standby position P2 in the case where the medium M is jammed in the inspection device 1. In addition, when returning the first conveying unit 10 and the second conveying unit 30 to the conveying position P1, the first driving unit 71 and the second driving unit 81 can start driving simultaneously.

[0109] Here, when a paper jam occurs during the conveyance of the medium M (during the inspection process), the control unit 91 stops the conveyance of the medium M by the first conveyance unit 10 and the second conveyance unit 30. Further, when the conveyance of the medium M by the first conveyance unit 10 and the second conveyance unit 30 is stopped, in order to ensure a space for releasing the paper jam, the control unit 91 performs the above-described control so that the first conveyance unit 10 rises to the standby position P2 and the second conveyance unit 30 descends to the standby position P2.

[0110] In this way, if the adsorption of the medium M by the downstream front fan 11 and the downstream rear fan 12 of the first conveyance unit 10 is maintained after the first conveyance unit 10 and the second conveyance unit 30 move to the standby position P2, in the case of a particularly small medium M, since the entire surface of the medium M is adsorbed to the first conveyance unit 10, the user will not be able to find the medium M when releasing the paper jam or the like. On the other hand, if the adsorption of the entire medium M is released after the conveyance of the medium M is stopped and when the first conveyance unit 10 is in the standby position P2, the medium M will fall to the side of the first inspection unit 20, and it is likely that the position of the medium M will become unclear.

[0111] Therefore, preferably, after the first conveyance unit 10 and the second conveyance unit 30 move to the standby position P2, as Figure 7 shown, only when the length in the conveyance direction D of the medium M is less than L [mm] (for example, less than 400 mm), the downstream front fan 11 is turned off. Thereby, the adsorption of a part (front side) of the medium M is released, a part of the medium M hangs down, and the medium M can be easily removed. Further, by releasing the adsorption of a part of the medium M after the first conveyance unit 10 and the second conveyance unit 30 move to the standby position P2, compared with the case where the adsorption of a part of the medium M is released before or during the movement, it is possible to prevent the medium M from being caught by the intermediate guide pair 95 or the downstream guide pair 96 and no longer being adsorbed to the first conveyance unit 10.

[0112] On the other hand, when the length in the conveyance direction D of the medium M is L [mm] or more (for example, 400 mm or more), it is preferable to keep all the fans turned on after the first conveyance unit 10 and the second conveyance unit 30 move to the standby position P2. This is because when the length in the conveyance direction D of the medium M is long, it is difficult to adsorb the entire surface of the medium M to the first conveyance unit 10. However, it is also possible to release the adsorption of a part of the medium M regardless of the size of the medium M.

[0113] Further, regarding the upstream front fan 31 and the upstream rear fan 32 of the second conveyance unit 30, it is preferable to keep at least one of them, and desirably both of them, in an operating state to maintain the adsorption of at least a part of the medium M.

[0114] Here, the method for releasing the adsorption of a part of the medium M is not limited to turning off a part of the plurality of fans (the downstream front fan 11). For example, it can also be achieved by weakening the air volume of a part of the fans, or by opening and closing a shutter for cutting off the air suction path. In the case of using a shutter, the number of fans can be only one. In addition, it is not limited to adsorption using suction, and adsorption using electrostatic adsorption can also be performed.

[0115] In addition, in the present embodiment, it is assumed that the user removes the medium M from the front side of the inspection device 1. By turning off the downstream front fan 11, the front part of the medium M droops. However, the rear part of the medium M can also be made to droop by turning off the downstream rear fan 12. In addition, regarding the plurality of fans, it is not limited to the downstream front fan 11 and the downstream rear fan 12 arranged in the front-rear direction, and they can also be arranged in the conveying direction D. In this case, by turning off the fan on the upstream side or the downstream side in the conveying direction D, the upstream end or the downstream end of the medium M can be made to droop. In addition, the number of the plurality of fans is not limited to two, and can also be three or more. In addition, the plurality of fans can be arranged, for example, in a total of 4 positions such as the upstream front part, the upstream rear part, the downstream front part, and the downstream rear part, so as to be arranged in the front-rear direction and the conveying direction D respectively.

[0116] In addition, in the present embodiment, when the conveyance of the medium M by the first conveyance unit 10 stops, the control unit 91 determines the operation (start) and stop (turn off) of the downstream front fan 11 and the downstream rear fan 12 based on the size of the medium M. However, it can also be determined based on the type of the medium M (for example, thickness, material, grammage, etc.). For example, in the case where the medium M is thin paper that is likely to droop, the state where both the downstream front fan 11 and the downstream rear fan 12 are operating can be maintained in the same manner as the medium M having a longer length in the conveying direction D.

[0117] Next, the adsorption states of the medium M having a length less than L [mm] in the conveying direction D (refer to Figures 8A - 10B ) and the medium M having a length of L [mm] or more in the conveying direction D (refer to Figures 11A - 13B ) when the conveyance stops due to paper jam or the like will be described.

[0118] As Figure 8AAs shown, when the first conveying unit 10 and the second conveying unit 30 are at the conveying position P1, most of the first medium M11 is adsorbed by the second conveying unit 30, and the upstream end portion of the first medium M11 in the conveying direction D is guided by the upstream guide pair 94. In addition, most of the second medium M12 is adsorbed by the first conveying unit 10, and the upstream end portion of the second medium M12 in the conveying direction D is guided by the intermediate guide pair 95.

[0119] After that, as Figure 8B shown, when the first conveying unit 10 and the second conveying unit 30 move to the standby position P2, since most of the first medium M11 is adsorbed by the second conveying unit 30 where the upstream front fan 31 and the upstream rear fan 32 are turned on, the first medium M11 disengages from the upstream guide pair 94. In addition, during the movement of the first conveying unit 10 from the conveying position P1 to the standby position P2, since most of the second medium M12 is adsorbed by the first conveying unit 10 where the downstream front fan 11 and the downstream rear fan 12 are turned on, the second medium M12 disengages from the intermediate guide pair 95. Then, after the first conveying unit 10 moves to the standby position P2, only the downstream front fan 11 is turned off, so the front portion of the second medium M12 droops.

[0120] As Figure 9A shown, when the first conveying unit 10 and the second conveying unit 30 are at the conveying position P1, the first medium M21 is located upstream of the second conveying unit 30 in the conveying direction D, and the downstream end portion of the first medium M21 in the conveying direction D is guided by the upstream guide pair 94. In addition, most of the second medium M22 is adsorbed by the second conveying unit 30, and the downstream end portion of the second medium M22 in the conveying direction D is guided by the intermediate guide pair 95. In addition, most of the third medium M23 is adsorbed by the first conveying unit 10, and the downstream end portion of the third medium M23 in the conveying direction D is guided by the downstream guide pair 96.

[0121] After that, as Figure 9BAs shown, when the first conveying unit 10 and the second conveying unit 30 move to the standby position P2, since the first medium M21 is not adsorbed by the second conveying unit 30 and the first conveying unit 10, the first medium M21 is still guided by the upstream guide pair 94 at the downstream end in the conveying direction D. In addition, since most of the second medium M22 is adsorbed by the second conveying unit 30 with the upstream front fan 31 and the upstream rear fan 32 turned on, it disengages from the intermediate guide pair 95. Further, during the movement of the first conveying unit 10 from the conveying position P1 to the standby position P2, since most of the third medium M23 is adsorbed by the first conveying unit 10 with the downstream front fan 11 and the downstream rear fan 12 turned on, the third medium M23 disengages from the downstream guide pair 96. Then, after the first conveying unit 10 moves to the standby position P2, only the downstream front fan 11 is turned off, so the front part of the third medium M23 droops.

[0122] As Figure 10A shown, when the first conveying unit 10 and the second conveying unit 30 are at the conveying position P1, the downstream end in the conveying direction D of the first medium M31 is adsorbed by the second conveying unit 30, and the portion of the first medium M31 downstream of the center in the conveying direction D is guided by the upstream guide pair 94. The upstream end in the conveying direction D of the second medium M32 is adsorbed by the second conveying unit 30, and the downstream end is adsorbed by the first conveying unit 10, but the adsorption area of the first conveying unit 10 is larger than that of the second conveying unit 30. The upstream end in the conveying direction D of the third medium M33 is adsorbed by the first conveying unit 10, but most of the third medium M33 is located downstream of the first conveying unit 10, and the third medium M33 is guided by the downstream guide pair 96.

[0123] After that, as Figure 10BAs shown, when the first conveying unit 10 and the second conveying unit 30 move to the standby position P2, since the downstream end portion in the conveying direction D of the first medium M31 is adsorbed by the second conveying unit 30 with the upstream front fan 31 and the upstream rear fan 32 turned on, the state where the downstream end portion is adsorbed by the second conveying unit 30 is maintained. However, since the upstream portion of the first medium M31 in the conveying direction D is located upstream of the second conveying unit 30 in the conveying direction D, the first medium M31 is guided by the upstream guide member pair 94 while maintaining the state where the downstream end portion is adsorbed by the second conveying unit 30. For the second medium M32, since the adsorption area of the first conveying unit 10 is larger than the adsorption area of the second conveying unit 30, the second medium M32 is adsorbed by the first conveying unit 10, separated from the second conveying unit 30, and disengaged from the intermediate guide member pair 95. Then, after the first conveying unit 10 moves to the standby position P2, only the downstream front fan 11 is turned off, so the front portion of the second medium M32 droops. In addition, when the adsorption area of the second conveying unit 30 is about the same as the adsorption area of the first conveying unit 10, the medium M can also be moved closer to one side of the first conveying unit 10 side and the second conveying unit 30 side by the conveyance of the first conveying unit 10 and the second conveying unit 30, and then the first conveying unit 10 and the second conveying unit 30 are moved to the standby position P2. The upstream end portion of the third medium M33 in the conveying direction D is adsorbed by the first conveying unit 10, but most of the third medium M33 is located downstream of the first conveying unit 10, so the third medium M33 is separated from the first conveying unit 10 and maintained in a state of being guided by the downstream guide member pair 96.

[0124] As Figure 11A shown, when the first conveying unit 10 and the second conveying unit 30 are at the conveying position P1, the upstream end portion of the first medium M41 in the conveying direction D is located upstream of the upstream guide member pair 94 in the conveying direction D, and the downstream end portion is adsorbed by the first conveying unit 10. The central portion of the second medium M42 in the conveying direction D is guided by the downstream guide member pair 96, and the upstream portion is adsorbed by the first conveying unit 10.

[0125] After that, as Figure 11BAs shown, when the first conveying unit 10 and the second conveying unit 30 move to the standby position P2, since the first medium M41 is on the entire second conveying unit 30 where the upstream front fan 31 and the upstream rear fan 32 are turned on, it disengages from the upstream guide pair 94 and the intermediate guide pair 95. However, since the length of the first medium M41 in the conveying direction D is longer than that of the second conveying unit 30, the first medium M41 hangs down on the upstream side and the downstream side of the second conveying unit 30. Approximately half of the second medium M42 in the conveying direction D is adsorbed by the first conveying unit 10 where the downstream front fan 11 and the downstream rear fan 12 are turned on. Therefore, the second medium M42 hangs down while maintaining the state where the upstream side portion is adsorbed by the first conveying unit 10, and is guided by the downstream guide pair 96.

[0126] As Figure 12A shown, when the first conveying unit 10 and the second conveying unit 30 are at the conveying position P1, the downstream end portion of the first medium M51 in the conveying direction D is adsorbed by the second conveying unit 30, but most of it is located upstream of the second conveying unit 30, and the first medium M51 is guided by the upstream guide pair 94. The upstream end portion of the second medium M52 in the conveying direction D is adsorbed by the second conveying unit 30, and the downstream end portion is adsorbed by the first conveying unit 10, but the adsorption area of the first conveying unit 10 is larger than that of the second conveying unit 30. The third medium M53 is located downstream of the first conveying unit 10 in the conveying direction D, and the upstream end portion of the third medium M53 in the conveying direction D is guided by the downstream guide pair 96.

[0127] After that, as Figure 12B shown, when the first conveying unit 10 and the second conveying unit 30 move to the standby position P2, although the downstream end portion of the first medium M51 in the conveying direction D is adsorbed by the second conveying unit 30, most of it is located upstream of the second conveying unit 30. Therefore, the first medium M51 separates from the second conveying unit 30 and remains in the state of being guided by the upstream guide pair 94. For the second medium M52, since the adsorption area of the first conveying unit 10 is larger than that of the second conveying unit 30, the second medium M52 is adsorbed by the first conveying unit 10 and separates from the second conveying unit 30, and disengages from the intermediate guide pair 95. Moreover, the upstream side portion of the second medium M52 hangs down upstream of the first conveying unit 10. Since the third medium M53 is not adsorbed by the second conveying unit 30 and the first conveying unit 10, the upstream end portion of the third medium M53 in the conveying direction D is still guided by the downstream guide pair 96.

[0128] As Figure 13AAs shown, when the first conveying unit 10 and the second conveying unit 30 are at the conveying position P1, the downstream end of the first medium M61 in the conveying direction D is adsorbed to the second conveying unit 30, and the portion downstream of the center in the conveying direction D is guided by the upstream guide pair 94. The upstream end of the second medium M62 in the conveying direction D is adsorbed to the second conveying unit 30, and the downstream end is located downstream of the downstream guide pair 96 in the conveying direction D.

[0129] After that, as Figure 13B shown, when the first conveying unit 10 and the second conveying unit 30 move to the standby position P2, since the downstream end of the first medium M61 in the conveying direction D is adsorbed to the second conveying unit 30 with the upstream front fan 31 and the upstream rear fan 32 turned on, the state where the downstream end is adsorbed to the second conveying unit 30 is maintained. However, since more than half of the upstream portion of the first medium M61 in the conveying direction D is located upstream of the second conveying unit 30 in the conveying direction D, the first medium M61 is guided by the upstream guide pair 94 while maintaining the state where the downstream end is adsorbed to the second conveying unit 30. The upstream end of the second medium M62 in the conveying direction D is adsorbed to the second conveying unit 30, and the downstream end is located downstream of the downstream guide pair 96 in the conveying direction D. However, the second medium M62 is entirely on the first conveying unit 10 with the downstream front fan 11 and the downstream rear fan 12 turned on. Therefore, the second medium M62 disengages from the middle guide pair 95 and the downstream guide pair 96 and hangs down on the upstream side and the downstream side of the first conveying unit 10.

[0130] In the present embodiment described above, as an example of a medium conveying mechanism, the inspection device 1 includes: a first conveying unit 10 disposed above the medium M for adsorbing and conveying the medium M; a first elevating unit (for example, suspension lines 51 to 54, first driving unit 71, etc.) for elevating the first conveying unit 10 between a conveying position P1 for conveying the medium M and a standby position P2 above the conveying position P1; and a control unit 91. When the conveyance of the medium M by the first conveying unit 10 stops, the control unit 91 controls the first elevating unit to raise the first conveying unit 10 to the standby position P2 and controls the first conveying unit 10 to release the adsorption of a part of the medium M (for example, Figure 8B the second medium M12 shown, Figure 9B the third medium M23 shown, and Figure 10B the second medium M32 shown).

[0131] Accordingly, when paper jams or the like occur, even if the conveyance of the medium M by the first conveyance unit 10 is stopped and the first conveyance unit 10 is raised from the conveyance position P1 to the upper standby position P2, a part of the medium M is allowed to droop by releasing the suction of a part of the medium M. Thus, the entire surface of the medium M is no longer adsorbed to the first conveyance unit 10. As a result, it is possible to prevent the user from losing sight of the medium M when clearing a paper jam or the like. In addition, compared with the method of releasing the adsorption of the entire medium M when the first conveyance unit 10 is in the standby position P2 after the conveyance of the medium M is stopped, it is possible to prevent the medium M from falling and making the position of the medium M unclear. Therefore, according to the present embodiment, when the conveyance of the medium M by the first conveyance unit 10 disposed above the medium M is stopped, the operation of removing the medium M can be easily performed. As a result, the usability of the user is improved and the availability is enhanced.

[0132] In addition, in the present embodiment, the first conveyance unit 10 includes a downstream front fan 11 and a downstream rear fan 12 as an example of a plurality of fans for sucking air. The control unit 91 controls the first conveyance unit 10 to release the adsorption of a part of the medium M by operating a part of the plurality of fans (for example, the downstream rear fan 12) and stopping another part of the plurality of fans (for example, the downstream front fan 11).

[0133] Accordingly, by such simple control of stopping a part of the plurality of fans and the existing structure, it is possible to release the adsorption of a part of the medium M and allow a part of the medium M to droop, thereby easily performing the operation of removing the medium M.

[0134] In addition, in the present embodiment, when the conveyance of the medium M by the first conveyance unit 10 is stopped, the control unit 91 determines the operation and stop of the plurality of fans based on at least one of the size (for example, the length in the conveyance direction D) and type of the medium M.

[0135] Accordingly, it is possible not to release the adsorption of a part of the medium M in the case of the medium M that is relatively easy to droop from the first conveyance unit 10, and in the case of the medium M that is relatively difficult to droop from the first conveyance unit 10, a part of the medium M can be reliably drooped by releasing the adsorption of a part of the medium M. Therefore, it is possible to easily perform the operation of removing the medium M by performing simple control only in the case of the medium M that is difficult to droop.

[0136] In addition, in the present embodiment, the inspection device 1 as an example of the medium conveyance mechanism further includes: a second conveyance unit 30, which is disposed at a position upstream (or downstream) of the first conveyance unit 10 in the conveyance direction D of the medium M and below the medium M, and is configured to adsorb and convey the medium M; and a second lifting unit (for example, suspension lines 51 to 54, first drive unit 71, etc.), which lifts and lowers the second conveyance unit 30 between the conveyance position P1 for conveying the medium M and a standby position P2 below the conveyance position P1. When the conveyance of the medium M by the second conveyance unit 30 stops, the control unit 91 controls the second lifting unit to lower the second conveyance unit 30 to the standby position P1, and controls the second conveyance unit 30 to maintain the adsorption of at least a part of the medium M.

[0137] Accordingly, after the conveyance of the medium M stops and the second conveyance unit 30 is lowered to the standby position P2, the state in which the medium M is adsorbed to the second conveyance unit 30 can be maintained. Therefore, it is possible to prevent the medium M from falling around the second conveyance unit 30 and making the position of the medium M unclear. Thus, the operation of removing the medium M can be easily performed.

[0138] In addition, the present invention is not limited to the above-described embodiment itself, and constituent elements can be modified within the scope not departing from the gist thereof at the implementation stage. Further, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the above-described embodiment. For example, all the constituent elements shown in the embodiment can be appropriately combined. Of course, various modifications and applications can be made within the scope not departing from the gist of the invention. Hereinafter, the invention described in the claims of the original application of the present application is appended.

[0139] [Appended Note 1]

[0140] A medium conveyance mechanism, characterized by comprising:

[0141] a first conveyance unit, which is disposed above the medium and configured to adsorb and convey the medium;

[0142] a first lifting unit, which lifts and lowers the first conveyance unit between the conveyance position for conveying the medium and a standby position above the conveyance position; and

[0143] a control unit, when the conveyance of the medium by the first conveyance unit stops, the control unit controls the first lifting unit to raise the first conveyance unit to the standby position, and controls the first conveyance unit to release the adsorption of a part of the medium.

[0144] [Appended Note 2]

[0145] The medium conveying mechanism according to Note 1 is characterized in that:

[0146] The first conveying unit has a plurality of fans for sucking air.

[0147] The control unit controls the first conveying unit to release the adsorption of a part of the medium by operating a part of the plurality of fans and stopping another part of the plurality of fans.

[0148] [Note 3]

[0149] The medium conveying mechanism according to Note 2 is characterized in that:

[0150] When the conveyance of the medium by the first conveying unit stops, the control unit determines the operation and stop of the plurality of fans based on at least one of the size and type of the medium.

[0151] [Note 4]

[0152] The medium conveying mechanism according to any one of Notes 1 to 3 is characterized by further comprising:

[0153] A second conveying unit, which is disposed at a position upstream or downstream of the first conveying unit in the conveying direction of the medium and below the medium, for adsorbing and conveying the medium; and

[0154] A second lifting unit, which lifts the second conveying unit between a conveying position for conveying the medium and a standby position below the conveying position.

[0155] Wherein, when the conveyance of the medium by the second conveying unit stops, the control unit controls the second lifting unit to lower the second conveying unit to the standby position, and controls the second conveying unit to maintain the adsorption of at least a part of the medium.

[0156] Explanation of reference numerals

[0157] 1: Inspection device; 10: First conveying unit; 11: Downstream front fan; 12: Downstream rear fan; 20: First inspection unit; 30: Second conveying unit; 31: Upstream front fan; 32: Upstream rear fan; 40: Second inspection unit; 51 - 54: Suspension lines; 61 - 64: Pulling lines; 71: First driving unit; 72: Power transmission unit; 73, 74: Drive shafts; 75 - 78: Pulleys; 81: Second driving unit; 82: Power transmission unit; 83: Drive shaft; 84, 85: Pulleys; 91: Control unit; 92: Storage unit; 93: Interface unit; 94: Upstream guide pair; 95: Intermediate guide pair; 96: Downstream guide pair; 97, 98: Contact switches; 100: Printing system; 110: Media supply device; 111: First supply unit; 111a: Stacking table; 111b: Adsorption conveying unit; 112: Second supply unit; 112a: Stacking table; 112b: Adsorption conveying unit; 113: Conveying roller pair; 120: First printing device; 121: Conveying roller pair; 122: First printing unit; 123: Adsorption conveying unit; 124, 125: Conveying path switching unit; 126: Steering roller pair; 127: Discharge tray; 130: Intermediate conveying device; 131: Conveying roller pair; 132: Steering roller pair; 133: Inversion housing unit; 140: Second printing device; 141: Conveying roller pair; 142: Second printing unit; 143: Adsorption conveying unit; 144, 145: Conveying path switching unit; 146: Steering roller pair; 147: Discharge tray; 150: Media discharge device; 151: Introduction unit; 152: First normal housing unit; 152a: Placement table; 153: Upper conveying unit; 154: Intermediate conveying unit; 155: Second normal housing unit; 155a: Placement table; 156: Abnormal housing unit; 157: Conveying roller pair; 158, 159: Conveying path switching unit; D: Conveying direction; M: Media; P1: Conveying position; P2: Standby position; R1: First supply path; R2: Second supply path; R3: Confluence path; R4, R6: Straight - through paths; R5, R7: Circulation paths; R8, R9, R10, R11: Housing paths.

Claims

1. A medium conveying mechanism, characterized in that, Comprising: A first conveying unit, which is arranged above the medium and is used for adsorbing and conveying the medium; A first lifting unit, which lifts and lowers the first conveying unit between a conveying position for conveying the medium and a standby position above the conveying position; And A control unit, when the conveying of the medium by the first conveying unit stops, the control unit controls the first lifting unit to lift the first conveying unit to the standby position, and controls the first conveying unit to release the adsorption of a part of the medium while maintaining the conveying stop state of the medium.

2. A medium conveying mechanism, characterized in that, Comprising: A first conveying unit, which is arranged above the medium and is used for adsorbing and conveying the medium; A first lifting unit, which lifts and lowers the first conveying unit between a conveying position for conveying the medium and a standby position above the conveying position; And A control unit, when the conveying of the medium by the first conveying unit stops, the control unit controls the first lifting unit to lift the first conveying unit to the standby position, and controls the first conveying unit to release the adsorption of a part of the medium, The first conveying unit has a plurality of fans for sucking air, The control unit controls the first conveying unit to release the adsorption of a part of the medium by operating a part of the plurality of fans and stopping another part of the plurality of fans.

3. The medium conveying mechanism according to claim 2, wherein When the conveying of the medium by the first conveying unit stops, the control unit determines the operation and stop of the plurality of fans based on at least one of the size and type of the medium.

4. The medium conveying mechanism according to any one of claims 1 to 3, characterized in that, Further comprising: A second conveying unit, which is arranged at a position upstream or downstream of the first conveying unit in the conveying direction of the medium and is arranged below the medium, and is used for adsorbing and conveying the medium; And A second lifting unit, which lifts and lowers the second conveying unit between a conveying position for conveying the medium and a standby position below the conveying position, Wherein, when the conveying of the medium by the second conveying unit stops, the control unit controls the second lifting unit to lower the second conveying unit to the standby position, and controls the second conveying unit to maintain the adsorption of at least a part of the medium.

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