Conveying device

Abstract

The present invention provides a conveying device. If a jam of paper occurs in a downstream conveying section, a control section controls the movement of a steering roller according to the movement status of the steering roller when the jam occurs, so that the paper in the upstream conveying section is discharged from a discharge port, and then controls to stop the conveying of the paper by the conveying section.

Description

Technical Field

[0001] The invention relates to a conveying device for conveying paper. Background Art

[0002] A printing system in which a plurality of printing devices are connected in series is known.

[0003] In the above-mentioned printing system, there is a demand for faster printing speed and realization of various functions, and in response to this, a plurality of optional devices such as an image inspection device and a paper discharge device are connected.

[0004] In a printing system including the above optional devices, the system is large-scale and the paper conveying path becomes longer. Therefore, when paper jam occurs and the paper conveying operation is stopped, more paper remains in the conveying path, and the burden of removing the paper is heavy.

[0005] In this regard, Japanese Patent Publication No. 2019-130755 discloses a printing system in which an intermediate paper discharge table is provided in an intermediate device disposed between two printing devices and on the front and back sides of the flipped paper. In this printing system, when a paper jam occurs, the paper is discharged to the intermediate paper discharge table so as not to convey the paper to the inkjet head unit of the printing device on the upstream side and the inkjet head unit of the printing device on the downstream side. By adopting this technology, the paper remaining in the device when a jam occurs can be reduced, and the work of removing the paper can be reduced. Summary of the invention

[0006] Problem that the invention aims to solve

[0007] In addition, in the above-mentioned technology, a driving mechanism is required to be provided for conveying paper from the downstream printing device to the intermediate paper discharge table in the opposite direction to the printing operation, which is unnecessary for the original printing operation. The provision of such an additional mechanism for dealing with jamming will lead to an increase in the size of the device.

[0008] An object of the present invention is to provide a conveying device that can reduce the work of removing paper remaining in a printing system when a jam occurs, without providing an additional mechanism for dealing with the jam.

[0009] Solutions for solving problems

[0010] The conveying device of the present invention includes: a conveying section, the conveying section having an upstream conveying section, a steering roller, and a downstream conveying section, the upstream conveying section conveying a sheet of paper, the steering roller receiving the sheet of paper from the upstream conveying section in a forward rotation action and conveying the sheet of paper, and then steering the sheet of paper by performing a reverse action, the downstream conveying section conveying the sheet of paper that has been steering by the steering roller; a discharge port, which is arranged on the downstream side of the steering roller in the conveying direction of the sheet of paper when the steering roller is in a forward rotation action; and a control section, if a sheet of paper is jammed in the downstream conveying section, the control section controls the movement of the steering roller according to the movement condition of the steering roller when the jam occurs so that the sheet of paper in the upstream conveying section is discharged from the discharge port, and then controls to stop the conveying of the sheet of paper by the conveying section.

[0011] Effects of the Invention

[0012] According to the above configuration, it is possible to reduce the work of removing the paper remaining in the printing system when a jam occurs, while suppressing the enlargement of the printing system. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the configuration of a printing system according to an embodiment.

[0014] Figure 2 yes Figure 1 The control block diagram of the printing system shown.

[0015] Figure 3 yes Figure 1 A schematic structural diagram of a reversing device of a printing system is shown.

[0016] Figure 4 This is a flowchart for explaining the operation of the printing system when a paper jam occurs in the downstream conveying unit.

[0017] Figure 5 This is a diagram showing the state of the steering roller in the forward rotation operation.

[0018] Figure 6 This is a diagram showing a situation in which the switchback roller is in the reverse operation and the paper being conveyed by the switchback roller has not reached the most upstream conveying roller of the reverse downstream conveying section.

[0019] Figure 7 This is a diagram showing a state in which the switchback roller is in the reverse operation and the paper being conveyed by the switchback roller reaches the most upstream conveying roller of the reverse downstream conveying section. DETAILED DESCRIPTION

[0020] In the following detailed description, for the purpose of explanation, many specific details are set forth so that the disclosed embodiments are thoroughly understood. However, it is apparent that one or more embodiments may be implemented without these specific details. In other cases, well-known structures and devices are schematically shown to simplify the drawings.

[0021] Next, embodiments of the present invention will be described with reference to the accompanying drawings. It should be noted that in all the drawings, the same or similar parts and components are marked with the same or similar reference numerals, and the description of these parts and components will be omitted or simplified. In addition, it should be noted that the drawings are schematic and therefore different from the actual structure.

[0022] Figure 1 1 is a schematic diagram showing the configuration of a printing system 1 provided with a transport device according to an embodiment of the present invention. Figure 2 yes Figure 1 A control block diagram of the printing system 1 is shown. Figure 3 yes Figure 1 FIG. 1 is a schematic diagram of the structure of the flip device 4 of the printing system 1. Figure 1 The up, down, left, and right directions of the paper are set as up, down, left, and right directions. Figure 1 , Figure 3 , Figure 5 to Figure 7 In the diagram, the right direction is represented by RT, the left direction is represented by LT, the upper direction is represented by UP, and the lower direction is represented by DN.

[0023] like Figure 1 , Figure 2 As shown, the printing system 1 includes a paper feeder 2, an upstream printing device 3, a reversing device 4, a downstream printing device 5, an image inspection device 6, a paper discharge device 7, and a control unit 8. In addition, the parts of the printing system 1 other than the upper paper feeder 11, the lower paper feeder 12, the printing units 32, 62, the inspection units 72, 73, the upstream stacking unit 82, the downstream lower stacking unit 83, and the downstream upper stacking unit 84 described later constitute a conveying device.

[0024] The paper feeding device 2 feeds the paper P to the upstream printing device 3 . The paper feeding device 2 includes an upper paper feeding unit 11 , a lower paper feeding unit 12 , and a paper feeding and conveying unit 13 .

[0025] The upper paper feed unit 11 feeds the paper P to an upper paper feed path 21 to be described later. The upper paper feed unit 11 includes an upper paper feed table 16 and an upper paper feed roller 17 .

[0026] The upper paper feed table 16 is used to stack the paper sheets P used for printing. The upper paper feed table 16 is configured to be able to be raised and lowered.

[0027] The upper paper feed roller 17 takes out the paper P from the upper paper feed table 16 and delivers it to the upper paper feed path 21 .

[0028] The lower paper feed unit 12 feeds the paper P to a lower paper feed path 22 described later. The lower paper feed unit 12 includes a lower paper feed table 18 and a lower paper feed roller 19 .

[0029] The lower paper feed table 18 is used to stack the paper sheets P used for printing. The lower paper feed table 18 is configured to be able to be raised and lowered. The lower paper feed table 18 is arranged below the upper paper feed table 16 .

[0030] The lower paper feed roller 19 takes out the paper P from the lower paper feed table 18 and feeds it to the lower paper feed path 22 .

[0031] The paper feed and conveying unit 13 conveys the paper P taken out from the upper paper feed table 16 and the paper P taken out from the lower paper feed table 18 to the upstream printing device 3. The paper feed and conveying unit 13 includes an upper paper feed path 21, a lower paper feed path 22, a common paper feed path 23, a plurality of conveying rollers 24, and a plurality of paper sensors 25.

[0032] The upper paper feed path 21 is a transport path for transporting the paper P from the upper paper feed table 16 to the common paper feed path 23 .

[0033] The lower paper feed path 22 is a transport path for transporting the paper P from the lower paper feed table 18 to the common paper feed path 23 .

[0034] The common paper feed path 23 is a conveying path for conveying the paper P conveyed along the upper paper feed path 21 and the paper P conveyed along the lower paper feed path 22 to the upstream printing device 3. The common paper feed path 23 is connected to the downstream end of the upper paper feed path 21 and the downstream end of the lower paper feed path 22 in the conveying direction of the paper P.

[0035] The plurality of conveying rollers 24 are arranged along the upper paper feed path 21 , the lower paper feed path 22 , and the common paper feed path 23 , and convey the paper P toward the upstream printing device 3 .

[0036] The plurality of paper sensors 25 are arranged along the upper paper feed path 21 , the lower paper feed path 22 , and the common paper feed path 23 , and detect the paper P being transported in the paper feed and transport unit 13 .

[0037] The upstream printing device 3 prints on one side of the paper P while conveying the paper P supplied by the paper supply device 2 . The upstream printing device 3 includes a print conveying unit 31 and a printing unit 32 .

[0038] The print transport unit 31 receives the paper P from the paper feeding device 2 and transports the paper P. The print transport unit 31 includes a print transport path 36 , a plurality of transport rollers 37 , a belt platen unit 38 , and a plurality of paper sensors 39 .

[0039] The print transport path 36 is a transport path for transporting the paper P below the printing unit 32 . The upstream end of the print transport path 36 is connected to the downstream end of the common paper feed path 23 .

[0040] Some of the plurality of conveying rollers 37 are arranged along the printing conveying path 36 on the upstream side of the belt platen section 38 and convey the paper P toward the belt platen section 38. The remaining conveying rollers 37 are arranged along the printing conveying path 36 on the downstream side of the belt platen section 38 and convey the paper P toward the reversing device 4.

[0041] The belt platen unit 38 sucks and holds the paper P on the belt and conveys the paper P. The belt platen unit 38 is disposed below the printing unit 32 so as to face the printing unit 32 .

[0042] The plurality of paper sensors 39 are arranged along the print transport path 36 , and detect the paper P transported in the print transport unit 31 .

[0043] The printing unit 32 includes an inkjet head (not shown), and performs printing by ejecting ink from the inkjet head onto the paper P conveyed by the belt platen unit 38 .

[0044] The reversing device 4 reverses the front and back sides of the paper P conveyed from the upstream printing device 3 and conveys the paper P to the downstream printing device 5. Figure 3 As shown, the inverting device 4 includes an inverting upstream conveying portion 41 , a turning conveying portion 42 , an intermediate discharge port (discharge port) 43 , and an inverting downstream conveying portion 44 .

[0045] The reverse upstream conveying section 41 conveys the paper P to the switchback conveying section 42 . The reverse upstream conveying section 41 includes a reverse upstream path 46 , a plurality of conveying rollers 47 , and a plurality of paper sensors 48 .

[0046] The reverse upstream path 46 is a conveying path for conveying the paper P from the upstream printing device 3 to the switchback conveying unit 42. The upstream end of the reverse upstream path 46 is connected to the downstream end of the print conveying path 36 of the upstream printing device 3. The downstream end of the reverse upstream path 46 is connected to one end (upper end) of the switchback path 51 described later.

[0047] The plurality of conveying rollers 47 are arranged along the reverse upstream path 46 , and convey the paper P toward the switchback conveying unit 42 .

[0048] The plurality of paper sensors 48 are arranged along the reverse upstream path 46 , and detect the paper P conveyed in the reverse upstream conveying unit 41 .

[0049] The switchback conveying section 42 switches the paper P conveyed from the inverting upstream conveying section 41 and conveys the paper P to the inverting downstream conveying section 44. The switchback conveying section 42 includes a switchback path 51, a switchback roller 52, and a paper sensor 53.

[0050] The switchback path 51 is a conveying path for switching the paper P. One end (upper end) of the switchback path 51 is connected to the downstream end of the reverse upstream path 46 and the upstream end of the reverse downstream path 56 described later. The intermediate discharge port 43 is formed at the other end (lower end) of the switchback path 51.

[0051] The steering roller 52 is a roller for steering the paper P. The steering roller 52 is used to perform steering of the paper P, and is therefore configured to be capable of forward and reverse rotation. Here, the action of the steering roller 52 conveying the paper P in the direction from the inverting upstream path 46 to the steering path 51 is referred to as a forward rotation action, and the action of conveying the paper P in the direction from the steering path 51 to the inverting downstream path 56 described later is referred to as a reverse rotation action.

[0052] That is, the switchback roller 52 receives the paper P from the conveying roller 47 of the inverting upstream conveying unit 41 by normal rotation and conveys it, and then performs reverse rotation to switch the paper P and convey it to the conveying roller 57 of the inverting downstream conveying unit 44 described later.

[0053] The paper sensor 53 detects the paper P being transported, near the downstream side of the switchback roller 52 in the transport direction of the paper P when the switchback roller 52 performs the normal rotation operation.

[0054] The intermediate discharge port 43 is a discharge port for discharging the paper P from the conveying path in the reversing device 4. As described above, the intermediate discharge port 43 is formed at the other end (lower end) of the turning path 51. That is, the intermediate discharge port 43 is arranged on the downstream side of the turning roller 52 in the conveying direction of the paper P when the turning roller 52 performs a normal rotation operation.

[0055] The paper sheets P discharged from the intermediate discharge port 43 are stacked on the bottom plate of the housing 45 of the reversing device 4. In addition, a stacking table on which the paper sheets P discharged from the intermediate discharge port 43 are stacked may be provided.

[0056] The reverse downstream conveying unit 44 conveys the paper P turned by the switchback conveying unit 42 to the downstream printing device 5. The reverse downstream conveying unit 44 includes a reverse downstream path 56, a plurality of conveying rollers 57, and a plurality of paper sensors 58.

[0057] The reverse downstream path 56 is a conveying path for conveying the paper P from the switchback conveying unit 42 to the downstream printing device 5 . The upstream end of the reverse downstream path 56 is connected to one end (upper end) of the switchback path 51 .

[0058] The plurality of conveying rollers 57 are arranged along the reversing downstream path 56, and convey the paper P toward the downstream printing device 5. Here, in the present embodiment, each conveying roller 57 is configured to convey the paper P only in the direction toward the downstream printing device 5. In addition, the most upstream conveying roller 57 among the plurality of conveying rollers 57 corresponds to the downstream conveying roller that receives the paper P from the switchback roller 52 and conveys it.

[0059] The plurality of paper sensors 58 are arranged along the reverse downstream path 56 , and detect the paper P conveyed in the reverse downstream conveying unit 44 .

[0060] The downstream printing device 5 prints on the other side of the paper P while conveying the paper P whose front and back sides have been reversed by the reversing device 4 . The downstream printing device 5 includes a print conveying unit 61 and a printing unit 62 .

[0061] The print transport section 61 receives the paper P from the reversing device 4 and transports the paper P. The print transport section 61 includes a print transport path 66 , a plurality of transport rollers 67 , a belt platen section 68 , and a plurality of paper sensors 69 .

[0062] The print transport path 66 is a transport path for transporting the paper P below the printing unit 62 . The upstream end of the print transport path 66 is connected to the downstream end of the reverse downstream path 56 .

[0063] Some of the plurality of conveying rollers 67 are arranged along the printing conveying path 66 on the upstream side of the belt platen section 68, and convey the paper P toward the belt platen section 68. The remaining conveying rollers 67 are arranged along the printing conveying path 66 on the downstream side of the belt platen section 68, and convey the paper P toward the image inspection device 6.

[0064] The belt platen unit 68 sucks and holds the paper P on the belt and conveys the paper P. The belt platen unit 68 is disposed below the printing unit 62 so as to face the printing unit 62 .

[0065] The plurality of paper sensors 69 are arranged along the print transport path 66 , and detect the paper P transported in the print transport unit 61 .

[0066] The printing unit 62 includes an inkjet head (not shown), and performs printing by ejecting ink from the inkjet head onto the paper P conveyed by the belt platen unit 68 .

[0067] The image inspection device 6 inspects the images printed on both sides of the paper P by the upstream printing device 3 and the downstream printing device 5 . The image inspection device 6 includes an inspection conveying unit 71 and inspection units 72 and 73 .

[0068] The inspection and transport section 71 receives and transports the paper P from the downstream printing device 5 . The inspection and transport section 71 includes an inspection and transport path 76 , belt platen sections 77 and 78 , and a plurality of paper sensors 79 .

[0069] The inspection conveyance path 76 is a conveyance path for conveying the paper P so as to pass through the reading areas of the inspection units 72 and 73 . The upstream end of the inspection conveyance path 76 is connected to the downstream end of the print conveyance path 66 .

[0070] The belt platen section 77 conveys the paper P conveyed by the downstream printing device 5 by sucking and holding it on the belt. The belt platen section 77 is provided so that the conveying surface of the paper P sucked and held faces upward.

[0071] The belt platen section 78 receives the paper P from the belt platen section 77 and conveys the paper. The belt platen section 78 is disposed with its conveying surface facing downward, and conveys the paper P by sucking and holding it on the conveying surface facing downward.

[0072] The plurality of paper sensors 79 are arranged along the inspection conveyance path 76 , and detect the paper P conveyed in the inspection conveyance unit 71 .

[0073] The inspection section 72 reads an image of the upward surface of the paper P conveyed by the belt platen section 77 for inspection. The inspection section 73 reads an image of the downward surface of the paper P conveyed by the belt platen section 78 for inspection.

[0074] The paper discharge device 7 discharges the paper P printed by the upstream printing device 3 and the downstream printing device 5. The paper discharge device 7 includes a paper discharge conveying unit 81, an upstream stacking unit 82, a downstream lower stacking unit 83, and a downstream upper stacking unit 84.

[0075] The paper discharge conveying unit 81 receives and conveys the paper P from the image inspection device 6, and selectively discharges the paper to the upstream stacking unit 82, the downstream lower stacking unit 83, and the downstream upper stacking unit 84. The paper discharge conveying unit 81 includes a common paper discharge path 86, an upstream paper discharge path 87, a downstream common paper discharge path 88, a downstream lower paper discharge path 89, a downstream upper paper discharge path 90, switching units 91, 92, a plurality of conveying rollers 93, and a plurality of paper sensors 94.

[0076] The common paper discharge path 86 is a common conveying path for the paper P conveyed to the upstream stacking section 82 , the downstream lower stacking section 83 , and the downstream upper stacking section 84 in the paper discharge conveying section 81 . The upstream end of the common paper discharge path 86 is connected to the downstream end of the inspection conveying path 76 .

[0077] The upstream paper discharge path 87 is a conveying path for conveying the paper P to the upstream stacking portion 82 and discharging the paper. The upstream end of the upstream paper discharge path 87 is connected to the downstream end of the common paper discharge path 86 .

[0078] The downstream common paper discharge path 88 is a common conveying path for the paper P conveyed to the downstream lower stacking section 83 and the downstream upper stacking section 84 . The upstream end of the downstream common paper discharge path 88 is connected to the downstream end of the common paper discharge path 86 .

[0079] The downstream lower paper discharge path 89 is a conveying path for conveying and discharging the paper P to the downstream lower stacking portion 83 . The upstream end of the downstream lower paper discharge path 89 is connected to the downstream end of the downstream common paper discharge path 88 .

[0080] The downstream upper paper discharge path 90 is a conveying path for conveying and discharging the paper P to the downstream upper stacking portion 84 . The upstream end of the downstream upper paper discharge path 90 is connected to the downstream end of the downstream common paper discharge path 88 .

[0081] The switching unit 91 switches the destination of the paper P conveyed from the common paper discharge path 86 to the downstream side between the upstream paper discharge path 87 and the downstream common paper discharge path 88. The switching unit 92 switches the destination of the paper P conveyed from the downstream common paper discharge path 88 to the downstream side between the downstream lower paper discharge path 89 and the downstream upper paper discharge path 90.

[0082] The plurality of conveying rollers 93 are arranged along the common paper discharge path 86 , the upstream paper discharge path 87 , the downstream common paper discharge path 88 , the downstream lower paper discharge path 89 , and the downstream upper paper discharge path 90 , and convey the paper P discharged by the paper discharge device 7 .

[0083] The plurality of paper sensors 94 are arranged along the common paper discharge path 86 , the upstream paper discharge path 87 , the downstream common paper discharge path 88 , the downstream lower paper discharge path 89 , and the downstream upper paper discharge path 90 , and detect the paper P being transported in the paper discharge transport unit 81 .

[0084] The upstream stacking section 82 stores the paper P discharged from the upstream paper discharge path 87. The upstream stacking section 82 includes a paper discharge table 96 that can be raised and lowered. The paper P is discharged and stacked on the paper discharge table 96. In addition, the upstream stacking section 82 includes an end guard that limits the position of the front end (downstream end) of the paper P discharged to the paper discharge table 96, a guide member that limits the position of the rear end (upstream end) of the paper P, and a pair of side guards that limit the position of the paper P in the width direction (none of which are shown in the figure).

[0085] The downstream lower stacking section 83 stores the paper P discharged from the downstream lower paper discharge path 89. The downstream lower stacking section 83 includes a paper discharge table 97 that can be raised and lowered. The paper P is discharged and stacked on the paper discharge table 97. In addition, the downstream lower stacking section 83 includes an end guard plate, a guide member, and a pair of side guard plates (all not shown) similarly to the upstream stacking section 82.

[0086] The downstream upper stacking section 84 stores the sheets P ejected from the downstream upper sheet ejection path 90 . The downstream upper stacking section 84 includes an end guard 98 and a pair of side guards 99 .

[0087] The end guard 98 regulates the position of the leading end (downstream end) of the paper P discharged to the downstream upper stacking portion 84. The end guard 98 is configured to be movable in the left-right direction.

[0088] The pair of side guards 99 regulates the position in the width direction of the paper P discharged to the downstream upper stacking portion 84. The side guards 99 are configured to be movable in the width direction of the paper P.

[0089] Here, in the printing system 1, the upstream conveying unit 101 is composed of the paper feeding conveying unit 13, the printing conveying unit 31 of the upstream printing device 3, and the reversing upstream conveying unit 41. In addition, the downstream conveying unit 102 is composed of the reversing downstream conveying unit 44, the printing conveying unit 61 of the downstream printing device 5, the inspection conveying unit 71, and the paper discharge conveying unit 81. In addition, the upstream conveying unit 101, the switchback roller 52, and the downstream conveying unit 102 constitute a conveying unit 103.

[0090] The control unit 8 controls the operation of each device (paper feeder 2, upstream printer 3, reverser 4, downstream printer 5, image inspector 6, paper ejector 7) of the printing system 1. The control unit 8 is composed of a microcomputer provided in each device of the printing system 1.

[0091] When a jam occurs in the downstream conveying section 102, the control section 8 controls the movement of the steering roller 52 according to the movement status of the steering roller 52 when the jam occurs, and discharges the paper P in the upstream conveying section 101 from the middle discharge port 43, and then controls to stop the conveyance of the paper P by the conveying section 103.

[0092] Here, as the operating status of the steering roller 52, it is determined whether the steering roller 52 is in forward rotation or reverse rotation. When in reverse rotation, it is determined whether the paper P being transported by the steering roller 52 has reached the upstreammost transport roller 57 of the reverse downstream transport unit 44.

[0093] Next, the operation of the printing system 1 will be described.

[0094] When printing is performed by the printing system 1, the paper feed device 2 takes out paper P from the upper paper feed unit 11 or the lower paper feed unit 12 and feeds the paper P to the upstream printing device 3. The upstream printing device 3 prints on one side of the paper P by the printing unit 32 while conveying the paper P.

[0095] The reversing device 4 reverses the front and back sides of the paper P, one side of which is printed in the upstream printing device 3, by the turn-around conveying unit 42, and conveys the paper P to the downstream printing device 5 with the other side (non-printed side) facing upward. The downstream printing device 5 prints the other side of the paper P by the printing unit 62 while conveying the paper P. Thus, images are printed on both sides of the paper P.

[0096] The image inspection device 6 inspects the images printed on both sides of the paper P and conveys the paper P to the paper discharge device 7. The paper discharge device 7 discharges the printed paper P to any one of the upstream stacking section 82, the downstream lower stacking section 83, and the downstream upper stacking section 84.

[0097] Next, the operation of the printing system 1 when a jam of the paper P occurs in the downstream transport unit 102 during the above-mentioned printing operation will be described.

[0098] Here, during the printing operation, when at least any one of the multiple paper sensors 58 of the flipping downstream conveying section 44 of the flipping device 4, the multiple paper sensors 69 of the downstream printing device 5, the multiple paper sensors 79 of the image inspection device 6, and the multiple paper sensors 94 of the paper discharge device 7 detects the paper P at a time delayed by a time greater than a threshold value relative to the theoretical value, the control unit 8 determines that a jam has occurred in the downstream conveying section 102 (downstream side of the steering roller 52).

[0099] Figure 4 This is a flowchart for explaining the operation of the printing system 1 when a jam of the paper P occurs in the downstream conveying unit 102 .

[0100] If it is determined that a jam has occurred in the downstream conveying section 102, Figure 4 In step S1, the control unit 8 determines whether the steering roller 52 is in the forward rotation operation when the jam occurs.

[0101] When it is determined that the switchback roller 52 is in the normal rotation operation (step S1 : Yes), in step S2 , the control unit 8 controls the switchback roller 52 to continue the normal rotation operation and discharges the paper P in the upstream conveying unit 101 from the intermediate discharge port 43 .

[0102] Here, when a jam occurs at the downstream conveying section 102, the steering roller 52 is in the forward rotation operation and Figure 5As shown in the figure, when there is a sheet of paper P being conveyed by the turn roller 52, the paper P is discharged from the middle discharge port 43 by continuing the normal rotation operation, and then the paper P conveyed from the upstream conveying unit 101 is conveyed to the middle discharge port 43 by the turn roller 52 and discharged. In addition, when a jam occurs, the delivery of the paper P by the upper paper feed unit 11 and the lower paper feed unit 12 is stopped.

[0103] and Figure 5 In a different state, when the steering roller 52 is in the process of performing a forward rotation without conveying the paper P, the paper P conveyed from the upstream conveying unit 101 is conveyed to the middle discharge port 43 and discharged by continuing the forward rotation.

[0104] Here, the switchback roller 52 waits for the paper P in the normal rotation operation after the switchback paper P leaves the switchback roller 52 until the next paper P reaches the switchback roller 52. Therefore, the switchback roller 52 may rotate normally without conveying the paper P.

[0105] When a jam occurs in the downstream conveying unit 102, after all the sheets of paper P in the upstream conveying unit 101 are discharged from the intermediate discharge port 43, Figure 4 In step S3 , the control unit 8 causes the conveying unit 103 to stop conveying the paper P. Thus, a series of operations are completed.

[0106] Here, in the downstream conveying section 102, the paper P on the downstream side of the jam occurrence position is discharged to any one of the upstream stacking section 82, the downstream lower stacking section 83, and the downstream upper stacking section 84 in the paper discharge device 7. When all the paper P of the upstream conveying section 101 are discharged from the middle discharge port 43, if the discharge of all the paper P on the downstream side of the jam occurrence position of the downstream conveying section 102 has not been completed, the control section 8 stops the conveying section 103 from conveying the paper P after the discharge of all the paper P on the downstream side of the jam occurrence position is completed.

[0107] Furthermore, the paper P remaining in the downstream conveying unit 102 on the upstream side of the jam occurrence position can be removed by the user's operation.

[0108] In addition, the paper P discharged from the intermediate discharge port 43 is stacked on the bottom plate of the housing 45 of the reversing device 4 as described above, and can be easily removed by the user.

[0109] In step S1, when it is determined that the switchback roller 52 is in the reverse operation when the jam occurs (step S1: No), in step S4, the control unit 8 determines whether the paper P being transported by the switchback roller 52 has reached the most upstream transport roller 57 of the reverse downstream transport unit 44. Here, for example, the control unit 8 can determine whether the paper P being transported by the switchback roller 52 has reached the most upstream transport roller 57 of the reverse downstream transport unit 44 based on the time elapsed from the start of the reverse operation of the switchback roller 52.

[0110] Here, Figure 6 5 shows a state in which the paper P being transported by the switchback roller 52 in the reverse operation has not reached the most upstream transport roller 57 of the reverse downstream transport section 44. Figure 7 The figure shows a state where the paper P being conveyed by the switchback roller 52 in the reverse operation reaches the conveying roller 57 at the most upstream side of the reverse downstream conveying unit 44 .

[0111] In step S4, if it is determined that Figure 6 When the paper P being transported by the turn roller 52 does not reach the most upstream transport roller 57 of the reverse downstream transport section 44 (step S4: No), Figure 4 In step S5, the control unit 8 switches the turn roller 52 to a forward rotation operation before the paper P being transported by the turn roller 52 reaches the most upstream transport roller 57 of the reverse downstream transport unit 44, and after the paper P being transported by the turn roller 52 is discharged from the intermediate discharge port 43, the paper P of the upstream transport unit 101 is discharged from the intermediate discharge port 43. Thereafter, the control unit 8 proceeds to step S3.

[0112] In step S4, if it is determined that Figure 7 When the sheet P being transported by the turn roller 52 has reached the most upstream transport roller 57 of the reverse downstream transport section 44 (step S4: Yes), Figure 4 In step S6, the control unit 8 switches the switchback roller 52 to normal rotation after the paper P being transported by the switchback roller 52 escapes from the switchback roller 52, and discharges the paper P in the upstream transport unit 101 from the intermediate discharge port 43. Thereafter, the control unit 8 proceeds to step S3.

[0113] Here, for example, the control unit 8 can determine whether the paper P being conveyed by the switchback roller 52 has escaped from the switchback roller 52 based on the time that has passed since the rear end of the paper P being conveyed by the switchback roller 52 was detected by the paper sensor 53 of the switchback conveying unit 42 .

[0114] As described above, the conveying roller 57 can convey the paper P only in the direction toward the downstream printing device 5. Figure 7In this situation, the paper P being transported by the turning roller 52 cannot be transported to the middle discharge port 43 and discharged. In contrast, as described above, by switching the turning roller 52 to a forward rotation operation after the paper P being transported by the turning roller 52 is separated from the turning roller 52, the paper P in the upstream conveying unit 101 can be discharged from the middle discharge port 43.

[0115] As described above, in the printing system 1, if a jam of the paper P occurs in the downstream conveying unit 102, the control unit 8 controls the operation of the turn roller 52 according to the operation status of the turn roller 52 when the jam occurs, so that the paper P in the upstream conveying unit 101 is discharged from the intermediate discharge port 43, and then controls to stop the conveyance of the paper P by the conveying unit 103. Thus, without providing an additional mechanism for dealing with the jam, the paper P remaining in the printing system 1 after the conveyance of the paper P is stopped due to the jam can be reduced. As a result, it is possible to suppress the enlargement of the printing system 1 and reduce the work of removing the paper P remaining in the printing system 1 when the jam occurs.

[0116] Specifically, when the switchback roller 52 is in the forward rotation when the jam occurs in the downstream conveying unit 102, the control unit 8 causes the switchback roller 52 to continue the forward rotation, and when there is a sheet of paper P being conveyed by the switchback roller 52 when the jam occurs, the sheet of paper P is discharged from the intermediate discharge port 43, and then the sheet of paper P in the upstream conveying unit 101 is discharged from the intermediate discharge port 43. Thus, even if the operation state of the switchback roller 52 is in the forward rotation when the jam occurs, the processing of discharging the sheet of paper P in the upstream conveying unit 101 from the intermediate discharge port 43 can be realized.

[0117] Furthermore, when the turn roller 52 is in the reverse rotation operation when the jam occurs in the downstream conveying section 102, and the paper P being conveyed by the turn roller 52 has not reached the most upstream conveying roller 57 of the inverting downstream conveying section 44, the control section 8 switches the turn roller 52 to the normal rotation operation before the paper P being conveyed by the turn roller 52 reaches the most upstream conveying roller 57, so that the paper P being conveyed by the turn roller 52 is discharged from the intermediate discharge port 43, and then the paper P of the upstream conveying section 101 is discharged from the intermediate discharge port 43. Thus, even if the operation state of the turn roller 52 is in the reverse rotation operation when the jam occurs in the downstream conveying section 102, and the paper P being conveyed has not reached the most upstream conveying roller 57 of the inverting downstream conveying section 44, the processing of discharging the paper P of the upstream conveying section 101 from the intermediate discharge port 43 can be realized.

[0118] In addition, when the jam occurs in the downstream conveying section 102, the switchback roller 52 is in the reverse operation and the paper P being conveyed by the switchback roller 52 has reached the most upstream conveying roller 57 of the inverting downstream conveying section 44, the control section 8 switches the switchback roller 52 to the normal operation after the paper P being conveyed by the switchback roller 52 is separated from the switchback roller 52, and the paper P of the upstream conveying section 101 is discharged from the intermediate discharge port 43. Thus, even if the operation status of the switchback roller 52 is in the reverse operation and the paper P being conveyed has reached the most upstream conveying roller 57 of the inverting downstream conveying section 44 when the jam occurs in the downstream conveying section 102, the processing of discharging the paper P of the upstream conveying section 101 from the intermediate discharge port 43 can be realized.

[0119] The embodiment of the present invention has the following structure, for example.

[0120] The conveying device includes: a conveying section having an upstream conveying section, a steering roller, and a downstream conveying section, the upstream conveying section conveying a sheet of paper, the steering roller receiving the sheet of paper from the upstream conveying section in a forward rotation action and conveying the sheet of paper, and then steering the sheet of paper by performing a reverse action, the downstream conveying section conveying the sheet of paper that has been steering by the steering roller; a discharge port, which is arranged on the downstream side of the steering roller in the conveying direction of the sheet of paper when the steering roller is in a forward rotation action; and a control section, if a jam of the sheet of paper occurs in the downstream conveying section, the control section controls the movement of the steering roller according to the movement condition of the steering roller when the jam occurs so that the sheet of paper in the upstream conveying section is discharged from the discharge port, and then controls to stop the conveying of the sheet of paper by the conveying section.

[0121] It may be that, when a jam occurs in the downstream conveying section and the steering roller is in forward rotation, the control unit causes the steering roller to continue to rotate in the forward direction, and when a paper is being conveyed by the steering roller when the jam occurs, the paper is discharged from the discharge port, and then the paper in the upstream conveying section is discharged from the discharge port.

[0122] The downstream conveying section may include a downstream conveying roller, which receives and conveys the paper from the steering roller. Alternatively, when a jam occurs in the downstream conveying section, the steering roller is in a reverse rotation operation, and the paper being conveyed by the steering roller has not reached the downstream conveying roller. Before the paper being conveyed by the steering roller reaches the downstream conveying roller, the control section switches the steering roller to a forward rotation operation, discharges the paper being conveyed by the steering roller when the jam occurs from the discharge port, and then discharges the paper in the upstream conveying section from the discharge port.

[0123] The downstream conveying section may include a downstream conveying roller, which receives and conveys the paper from the steering roller. Alternatively, when a jam occurs in the downstream conveying section, the steering roller is in a reverse rotation action, and the paper being conveyed by the steering roller has reached the downstream conveying roller. When the jam occurs, the control section switches the steering roller to a forward rotation action after the paper being conveyed by the steering roller detaches from the steering roller, so that the paper in the upstream conveying section is discharged from the discharge port.

[0124] The embodiments of the present invention are described above. However, the present invention may be implemented in other specific forms without departing from the technical ideas or technical features of the present invention. Therefore, the present embodiment is considered to be illustrative rather than restrictive in all aspects, and the protection scope of the present invention is determined by the claims rather than by the foregoing description, and all changes within the equivalent meanings and scopes of the claims are included in the protection scope of the present invention.

[0125] In addition, the effects described in the embodiments of the present invention are merely a list of the best effects achieved by the present invention, and therefore, the effects of the present invention are not limited to the effects described in the embodiments of the present invention.

Claims

1. A conveying device, wherein: The conveying device comprises: a conveying section including an upstream conveying section, a steering roller, and a downstream conveying section, wherein the upstream conveying section conveys a sheet of paper, the steering roller receives the sheet of paper from the upstream conveying section in a forward rotation motion and conveys the sheet of paper, and then reverses the sheet of paper by performing a reverse motion, and the downstream conveying section conveys the sheet of paper that has been reversed by the steering roller; an intermediate discharge port arranged on the downstream side of the turn roller in the conveying direction of the paper when the turn roller is in a normal rotation operation; a paper discharge device disposed on the downstream side of the intermediate discharge port in the conveying direction of the paper during the reverse operation of the steering roller, the paper discharge device discharges the printed paper from the conveying section to the stacking section; and a control unit that controls the movement of the steering roller to discharge the paper of the upstream conveying unit from the intermediate discharge port if a jam of the paper occurs in the downstream conveying unit, and then controls to stop the conveying of the paper by the conveying unit, according to the movement status of the steering roller when the jam occurs. The downstream conveying unit includes a downstream conveying roller, which receives the paper from the turn roller and conveys the paper. When a jam occurs in the downstream conveying section and the steering roller is in reverse motion, and the paper being conveyed by the steering roller has reached the downstream conveying roller, the control section switches the steering roller to forward rotation after the paper being conveyed by the steering roller detaches from the steering roller when the jam occurs, so that the paper in the upstream conveying section is discharged from the middle discharge port.

2. The conveying device according to claim 1, wherein: When a jam occurs in the downstream conveying section and the steering roller is in forward rotation, the control section causes the steering roller to continue forward rotation, and when there is a sheet of paper being conveyed by the steering roller when the jam occurs, the sheet of paper is discharged from the middle discharge port, and then the sheet of paper in the upstream conveying section is discharged from the middle discharge port.

3. The conveying device according to claim 1, wherein: When a jam occurs in the downstream conveying section and the steering roller is in reverse motion, and the paper being conveyed by the steering roller has not reached the downstream conveying roller, the control section switches the steering roller to forward rotation before the paper being conveyed by the steering roller reaches the downstream conveying roller, discharges the paper being conveyed by the steering roller when the jam occurs from the middle discharge outlet, and then discharges the paper in the upstream conveying section from the middle discharge outlet.

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