JP5786489B2 - Reverse conveying apparatus, image forming apparatus, and conveying apparatus - Google Patents

Description

  The present invention relates to a reverse conveyance device, an image forming apparatus, and a conveyance device.

  As a prior art described in the publication, there is an automatic printing apparatus that continuously creates a double-sided copy, in which an image forming unit that forms an image on a sheet and a sheet that forms an image on the first side of the continuous sheet Means for continuously feeding the image forming means, and means for forming a paper transport path for continuously transporting the paper so as to form an image on the opposite surface of the paper having an image on the first surface. In the automatic printing apparatus having the above-described configuration, the paper conveyance path includes a unit that reverses each of the continuously fed sheets once around an axis orthogonal to the direction of the path, and the paper conveyance path. A lateral movement reversing device that reverses each continuously fed sheet once about an axis parallel to the direction, and further, an axis perpendicular to the direction of the sheet transport path. Means for reversing each printed paper once The lateral movement reversing device includes a guide baffle and a paper insertion baffle, both of the baffles form part of the paper transport path, and one of the baffles has at least one opening. A rotatable fan-shaped drive roll having one sheet guide means, a flat portion and a curved portion, wherein the curved portion extends through the opening of the baffle with the opening, and the drive roll A drive roll that engages to drive paper against another baffle when it is rotated, the flat portion adjacent to the opening but not extending to the opening, and the direction of the paper transport path An arcuate paper reversing guide means for guiding and reversing the paper around an axis parallel to the axis, and a means for conveying the paper through the arcuate paper reversing guide means Printing There exist (Patent Document 1).

Japanese Patent No. 2561380

  The present invention prevents the posture of the recording material from being disturbed when the front and back are reversed without changing the front and back of the recording material.

The invention according to claim 1 includes a first side and a second side located on the opposite side of the first side, a front side intersecting with the first side, and the front side. The recording medium is carried in, and includes a carrying-in path for carrying a recording material having a rear side located on the opposite side of the recording medium, and a pair of rotating bodies arranged so as to be able to contact and separate with respect to the carrying-in path. A first transport unit that sandwiches a material and transports the first side in a first direction with the front side leading, and a pair of rotating bodies that are arranged so as to be able to come into contact with and separate from each other with the carry-in path interposed therebetween; A second conveying unit that sandwiches the recording material conveyed by the first recording medium and conveys the recording material in a second direction with the first side leading, and is connected to the carry-in path and conveyed by the second conveying unit The coming recording material is guided so that the first side and the second side of the recording material are interchanged. Thus, the reversing path for reversing the front and back surfaces of the recording material, and the recording material provided in the reversing path and conveyed by the second conveying unit, the first side of the recording material starting from the first side. A third transport section that transports the recording material in three directions; and a transport path that is connected to the reversing path and transports the recording material that is transported in a state where the front and back surfaces are reversed by the reversing path and the third transport section. And a pair of rotating bodies arranged so as to be able to contact and separate with respect to the carry-out path, and sandwich the recording material conveyed by the third conveying unit, and the first side is the first A fourth transport unit that transports in four directions, and a pair of rotating bodies that are arranged so as to be able to contact and separate with respect to the unloading path, sandwich the recording material transported by the fourth transport unit, and Fifth transport that transports in the fifth direction with the front side leading The first transport unit, the second transport unit, the third transport unit, the fourth transport unit, and the fifth transport unit are transported from the transport unit upstream in the recording material transport direction. When delivering the recording material to the conveyance unit on the downstream side in the direction, at least one of the conveyance unit on the upstream side and the conveyance unit on the downstream side delivers while sandwiching the recording material, and the first conveyance unit, The pair of rotating bodies in at least one of the second transport unit, the fourth transport unit, and the fifth transport unit may be a transport unit upstream of the at least one transport unit and / or the at least the transport unit. When delivering the recording material to and from a conveyance unit on the downstream side of one conveyance unit, one of the pair of rotators in the at least one conveyance unit has a small friction coefficient in the sheet conveyance path. And the friction coefficient is The hearing other rotating body is a reverse conveying device to retract from the sheet conveying path.
According to a second aspect of the present invention, the third transport unit includes a pair of rotating bodies, and when the recording material is transferred between the second transport unit and the fourth transport unit, 2. The reversing and conveying device according to claim 1, wherein the two rotating members of the rotating member maintain a state in which both of them remain in the sheet conveying path .
The invention according to claim 3 is characterized in that the one rotating body in the at least one transport section is rotated by being driven by the other rotating body that is rotated by receiving an external drive. Or it is a reverse conveyance apparatus of 2 .
The invention according to claim 4 is the first side and the second side located on the opposite side of the first side, the front side intersecting the first side and the front side Forming a recording material having a rear side located on the opposite side of the recording medium along a conveying path with the front side as a head, and forming an image on the recording material conveyed by the conveying unit And when the image is formed on the second surface of the recording material on which the image is formed on the first surface of the recording material by the image forming unit, the first of the recording material conveyed by the conveying means A reversal conveyance unit that conveys the recording material by reversing the front and back of the recording material so that the first side and the second side are interchanged, and the reversal conveyance unit is connected to the conveyance path, and the front side A transport path for transporting the recording material transported starting from the head, and the transport path A first transport unit that has a pair of rotators arranged so as to be able to contact and separate with respect to each other, sandwiches the recording material that is transported in, and transports the recording medium in a first direction with the front side leading, and the transporting It has a pair of rotating bodies arranged so as to be able to contact and separate with respect to the path, and sandwiches the recording material transported by the first transport unit, in the second direction where the first side is the head The first side of the recording material and the second side of the recording material are switched between the second conveying unit that conveys the recording material that is connected to the carry-in path and is conveyed by the second conveying unit. The reversing path for reversing the front and back surfaces of the recording material and the recording material that is provided in the reversing path and is transported by the second transport unit, with the first side on the top. Connected to the reversing path and a third transport unit that transports in the third direction. A carry-out path for carrying out the recording material conveyed in a state where the front and back sides are reversed by the reverse path and the third transport unit, and a pair of rotating bodies arranged so as to be able to contact and separate with respect to the carry-out path A recording medium conveyed by the third conveyance unit, and in contact with a fourth conveyance unit that conveys the recording material in a fourth direction with the first side as the head, with the conveyance path interposed therebetween. A fifth transport unit that has a pair of rotative bodies arranged in a separable manner, sandwiches the recording material transported by the fourth transport unit, and transports the recording medium in a fifth direction with the front side leading. The first transport unit, the second transport unit, the third transport unit, the fourth transport unit, and the fifth transport unit from the transport unit upstream in the recording material transport direction to the downstream side in the recording material transport direction. When the recording material is delivered to the transport unit, the upstream transport unit and In addition, at least one of the downstream-side conveyance units transfers the recording material while sandwiching the recording material, and at least one of the first conveyance unit, the second conveyance unit, the fourth conveyance unit, and the fifth conveyance unit. The pair of rotating bodies in one transport unit is used when the recording material is transferred between the transport unit on the upstream side of the at least one transport unit and / or the transport unit on the downstream side of the at least one transport unit. An image forming apparatus in which one of the pair of rotators in the at least one transport unit is left in the sheet transport path, and the other rotator having a large friction coefficient is retreated from the sheet transport path. is there.
The invention according to claim 5 is the first side and the second side located on the opposite side of the first side, the front side intersecting the first side, and the front side And a pair of rotating bodies arranged so as to be able to come into contact with and separated from each other with the conveyance path interposed therebetween, and the recording material carried in An input transport unit that is sandwiched and transported in the input direction with the front side leading, and a pair of rotating bodies that are arranged so as to be able to contact and separate across the transport path, and are transported by the input transport unit An output conveying unit that sandwiches the recording material and conveys the recording medium in an output direction with the first side as the head, and the input conveying unit and the output conveying unit from the input conveying unit to the output conveying unit When delivering the recording material, at least one of the input transport unit and the output transport unit Together passes while sandwiching the recording material, the pair of rotating bodies in at least one conveying portion of said input conveying unit and the output conveyor section, when passing the recording material between the other conveying portion In addition, in the transporting device, the one rotating body having a small friction coefficient among the pair of rotating bodies in the one transporting unit is left in the sheet transporting path, and the other rotating body having the large friction coefficient is retracted from the sheet transporting path. .
According to the sixth aspect of the present invention, when the recording material is delivered from the input conveying unit to the output conveying unit, the output conveying unit stops after the recording material has been conveyed by the input conveying unit. 6. The transport apparatus according to claim 5, wherein the input transport unit releases the recording material after the output transport unit sandwiches the recording material and before starting to transport the recording material.
According to a seventh aspect of the present invention, the conveyance of the recording material in the input direction is stopped by stopping the rotation of the pair of rotating bodies of the input conveyance unit without abutting the recording material against another member. The transport device according to claim 5 or 6.

According to the first aspect of the present invention, it is possible to suppress the posture of the recording material from being disturbed when the front and back are reversed without changing the front and back of the recording material, as compared with the case where the present configuration is not provided. .
According to the second aspect of the present invention, when the front and back sides of the recording material are reversed without changing the front and back of the recording material, the recording material changes in accordance with the change in the conveyance direction of the recording material. Can be prevented from being disturbed.
According to the third aspect of the present invention, it is possible to suppress the recording material from hitting and being damaged by the downstream conveyance unit, as compared with the case where this configuration is not provided.
According to the fourth aspect of the present invention, it is possible to suppress the posture of the recording material from being disturbed when the front and back are reversed without changing the front and back of the recording material, as compared with the case where this configuration is not provided. .
According to the invention of claim 5, it is possible to suppress the posture of the recording material from being disturbed as compared with the case where the present configuration is not provided.
According to the sixth aspect of the present invention, the posture of the recording material can be suppressed from being disturbed as the recording material conveyance direction changes, as compared with the case where the present configuration is not provided.
According to the invention of claim 7, as compared with the case where this configuration is not provided, the recording material is stopped by stopping the rotation of the pair of rotating bodies of the input transport unit without abutting the recording material against other members. In the configuration in which the conveyance in the input direction is stopped, the posture of the recording material can be suppressed from being disturbed.

1 is a diagram of an image forming apparatus to which the exemplary embodiment is applied as viewed from the front side. 1 is a perspective view illustrating an overall configuration of a sheet reversing device. FIG. 10 is a diagram for explaining a relationship between each conveyance path provided in the sheet reversing device and a sheet conveyance direction in each conveyance path. FIG. 6 is a diagram for explaining a configuration of each conveyance path and each conveyance unit in the sheet reversing device. FIG. 6 is a diagram for explaining a configuration of a pair of conveyance rolls provided in each conveyance unit of the sheet reversing device. FIG. 10 is a diagram for explaining a relationship between each conveyance path and each conveyance roll pair in the sheet reversing device. It is a figure for demonstrating an example of a structure of the advancing / retreating mechanism and rotation mechanism of an upstream 1st inversion roll pair. It is a timing chart explaining operation | movement of each conveyance part. FIG. 10 is a diagram for explaining a relationship between each conveyance path and each conveyance roll pair in the sheet reversing device. It is a figure for demonstrating an example of a structure of the advancing / retreating mechanism and rotation mechanism of an upstream 1st inversion roll pair.

<Embodiment 1>
Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.
<Image forming apparatus 1>
FIG. 1 is a diagram of an image forming apparatus 1 to which the exemplary embodiment is applied as viewed from the front side. An image forming apparatus 1 shown in FIG. 1 has a so-called tandem configuration, and includes a plurality of image forming units 10 (10Y, 10M, 10C, and 10K) that form toner images of respective color components by electrophotography. I have. The image forming apparatus 1 includes a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and the like, and controls the operation of each device and each part of the image forming device 1. A control unit 80 is provided. Further, the image forming apparatus 1 includes a touch panel or the like, and includes a user interface unit (UI) 90 that outputs an instruction received from the user to the control unit 80 and presents information from the control unit 80 to the user. Furthermore, the image forming apparatus 1 includes a receiving unit 70 that receives image data or the like from, for example, a personal computer (PC) or an image reading device (scanner).

  Further, the image forming apparatus 1 sequentially transfers (primary transfer) each color component toner image formed by each image forming unit 10 and holds the toner image on the intermediate transfer belt 20. And a secondary transfer device 30 that collectively transfers (secondary transfer) the toner image onto a sheet (recording material) P. Here, each of the image forming units 10, the intermediate transfer belt 20, and the secondary transfer device 30 can be regarded as an image forming unit that forms an image on the paper P.

  Each of the image forming units 10 includes a photosensitive drum 11 that is rotatably mounted. In each of the image forming units 10, around the photosensitive drum 11, a charging device 12 that charges the photosensitive drum 11, an exposure device 13 that exposes the photosensitive drum 11 to write an electrostatic latent image, and a photosensitive member A developing device 14 that visualizes the electrostatic latent image on the drum 11 with toner is provided. Further, each of the image forming units 10 includes a primary transfer device 15 that transfers each color component toner image formed on the photosensitive drum 11 to the intermediate transfer belt 20, and a drum cleaning that removes residual toner on the photosensitive drum 11. A device 16 is provided.

  Next, the intermediate transfer belt 20 is provided so as to be stretched over three roll members 21 to 23 that are rotatably provided. Of these three roll members 21 to 23, the roll member 22 drives the intermediate transfer belt 20. The roll member 23 is disposed opposite to the secondary transfer roll 31 with the intermediate transfer belt 20 interposed therebetween, and the secondary transfer device 30 is configured by the secondary transfer roll 31 and the roll member 23. A belt cleaning device 24 for removing residual toner on the intermediate transfer belt 20 is provided at a position facing the roll member 21 across the intermediate transfer belt 20.

  The image forming apparatus 1 also includes a first transport path R1 through which the paper P transported toward the secondary transfer apparatus 30 passes, and a second transport path through which the paper P after passing through the secondary transfer apparatus 30 passes. R3, a third transport path R3 that branches from the second transport path R2 downstream of the fixing device 50 (described later) and extends below the first transport path R1 to guide the paper P to the paper reversing device 100 (described later). A fourth transport path R4 is provided for guiding the paper that has passed through the paper reversing device 100 (described later) to the first transport path R1 again. Here, in the first conveyance path R1 to the fourth conveyance path R4, two side edges (one side edge and this one side edge are opposite to each other) of the four side edges of the paper P facing each other. The paper P is transported so that the other side located on the side (details will be described later) moves along these transport paths.

The image forming apparatus 1 according to the present embodiment further includes a paper reversing device 100 that reverses the front and back of the paper P carried from the third transport path R3 and transports the paper P to the fourth transport path R4. The sheet reversing device 100 has a function of reversing the sheet P around the axis along the sheet transport direction in the first transport path R1 and the sheet transport direction in the third transport path R3. That is, the sheet reversing device 100 according to the present embodiment reverses the relationship between the two side edges (side edges) of the paper P without changing the relationship between the leading and trailing edges of the paper P in the paper transport direction. The sheet reversing device 100 is configured so that the carry-in path Ra connected to the third transport path R3, the carry-out path Rc connected to the fourth transport path R4, and the front and back of the paper P supplied from the carry-in path Ra. And an inversion path Rb that is inverted and supplied to the carry-out path Rc.
A paper detection sensor 60 that detects the passage of the paper P is attached to the third transport path R3 on the paper reversing device 100 on the carry-in side of the paper P.

  Further, in the present embodiment, an opening 3 is formed in the housing 2 of the image forming apparatus 1. Here, among the sheets P transported along the second transport path R2, those not guided to the third transport path R3 are discharged to the outside of the housing 2 through the opening 3, and are not shown. It is loaded on the club. A processing device (not shown) may be provided adjacent to the casing 2 to further perform processing such as punching the paper P discharged from the opening 3.

  Further, the image forming apparatus 1 is provided with a first paper supply device 40A that supplies the paper P to the first conveyance path R1, and on the downstream side in the conveyance direction of the paper P with respect to the first paper supply device 40A. And a second paper supply device 40B for supplying the paper P to the path R1. The first paper supply device 40A and the second paper supply device 40B are configured in the same manner, and each of the first paper supply device 40A and the second paper supply device 40B has a paper storage portion 41 for storing the paper P. A take-out roll 42 for taking out and transporting the paper P stored in the paper storage unit 41 is provided.

  A first transport roll 44 that transports the paper P on the first transport path R1 toward the secondary transfer apparatus 30 is provided on the first transport path R1 and upstream of the secondary transfer apparatus 30. ing. Further, the second transport roll 45 that transports the paper P toward the first transport roll 44, the third transport roll 46 that transports the paper P toward the second transport roll 45, and the paper P toward the third transport roll 46. The 4th conveyance roll 47 which conveys is provided. Here, the first transport roll 44, the second transport roll 45, the third transport roll 46, and the fourth transport roll 47 can be regarded as transport means for transporting the paper P along the transport path.

  In addition to these transport rolls, the transport of transporting the paper P located on these transport paths to the first transport path R1, the second transport path R2, the third transport path R3, and the fourth transport path R4. A plurality of rolls 48 are provided. The first transport roll 44, the second transport roll 45, the third transport roll 46, the fourth transport roll 47, and the transport roll 48 are configured by a pair of roll-shaped members that are rotatably provided and press each other. One roll-shaped member is rotationally driven to carry the paper P.

  In the present embodiment, an abutting member 43 against which the leading end of the paper P is abutted is provided between the second conveying roll 45 and the third conveying roll 46. In the present embodiment, the skew of the paper P (the inclination of the paper P with respect to the transport direction) is corrected by abutting the leading end of the paper P against the abutting member 43. In addition, after the skew of the paper P is corrected by the abutting member 43, the abutting member 43 is retracted from the first transport path R1.

  The image forming apparatus 1 further includes a fixing device 50 that fixes the image secondarily transferred onto the paper P by the secondary transfer device 30 on the second transport path R2. The fixing device 50 includes a heating roll 50A that is heated by a built-in heater (not shown) and a pressing roll 50B that presses the heating roll 50A. In the fixing device 50, the paper P passes between the heating roll 50A and the pressing roll 50B, whereby the paper P is heated and pressurized, and the image on the paper P is fixed to the paper P.

  Further, a belt conveyance unit 49 is provided between the secondary transfer device 30 and the fixing device 50 to convey the paper P that has passed through the secondary transfer device 30 to the fixing device 50. The belt transport unit 49 has a belt that moves around, and transports the paper P by placing the paper P on the belt.

  Further, in the image forming apparatus 1 of the present embodiment, an image can be formed on the first surface of the paper P supplied from the first paper supply device 40A or the like, and in addition, an image can be formed on the second surface of the paper P. Can be formed. More specifically, in this image forming apparatus 1, the front and back of the paper P that has passed through the fixing device 50 are reversed by the paper reversing device 100, and the paper P with the front and back reversed is conveyed to the secondary transfer device 30 again. Is done. Then, the image is transferred onto the second surface of the paper P by the secondary transfer device 30. Thereafter, the sheet P passes through the fixing device 50 again, and the transferred image is fixed on the sheet P. As a result, an image is formed not only on the first side of the paper P but also on the second side.

FIG. 2 is a perspective view showing the overall configuration of the sheet reversing device 100 shown in FIG.
The sheet reversing device 100 according to the present embodiment includes a frame body 101 including four columns and stays that connect the columns, and a sheet guide unit 200 that is attached to the frame body 101 and used for reversing and conveying the sheet P. It has.

  Among these, the paper guide unit 200 includes a carry-in unit 210 into which the paper P is carried in from the third conveyance path R3 (see FIG. 1), and a reversing unit 220 that reverses the front and back of the paper P sent from the carry-in unit 210. And a carry-out unit 230 for carrying out the paper P sent from the reversing unit 220 to the fourth conveyance path R4 (see FIG. 1). Here, in the present embodiment, the carry-out unit 230 is arranged above the carry-in unit 210, and the carry-out unit 230 and the carry-in unit 210 overlap when viewed from above. On the other hand, the reversing unit 220 is arranged at the front side in FIG. 2, that is, the front side in the image forming apparatus 1 shown in FIG. 1 with respect to the carry-in unit 210 and the carry-out unit 230. Thereby, in the paper reversing device 100, a space is formed between the carry-in unit 210 and the carry-out unit 230 that constitute the paper guide unit 200.

  The carry-in unit 210 has a carry-in route Ra for receiving the paper P from the third carry route R3, and the reversing unit 220 has a reverse route Rb for receiving the paper P from the carry-in route Ra. Are each provided with a carry-out path Rc for receiving the paper P from the reversing path Rb and delivering the received paper P to the fourth transport path R4. Accordingly, in the paper guide unit 200, the carry-in route Ra, the reverse route Rb, and the carry-out route Rc are connected to each other to form a continuous conveyance route.

  Here, the carry-in unit 210 includes a first carry-in guide plate 211 and a second carry-in guide plate 212 that are arranged to face each other to form a carry-in route Ra. In this example, the first carry-in guide plate 211 is located outside (below) the sheet reversing device 100 as viewed from the second carry-in guide plate 212, and the above-described space is formed above the second carry-in guide plate 212. Has been.

  The reversing unit 220 includes a first reversing guide plate 221 and a second reversing guide plate 222 that are disposed to face each other to form a reversing path Rb. In this example, the second reversing guide plate 222 is positioned outside the sheet reversing device 100 as viewed from the first reversing guide plate 221, and the second reversing guide plate 222 is opposite to the first reversing guide plate 221. The above-described space is formed on the side.

  Further, the carry-out unit 230 includes a first carry-out guide plate 231 and a second carry-out guide plate 232 that are arranged to face each other to form a carry-out route Rc. In this example, the first carry-out guide plate 231 is positioned outside (above) the sheet reversing device 100 as viewed from the second carry-out guide plate 232, and the above-described space is formed below the second carry-out guide plate 232. Has been.

  Each of the carry-in unit 210, the reversing unit 220, and the carry-out unit 230 is provided with a plurality of conveyance rolls that convey the paper P, and details thereof will be described later.

<Conveying direction of paper P>
FIG. 3 is a diagram for explaining the relationship between each conveyance path provided in the sheet reversing device 100 and the conveyance direction of the sheet P in each conveyance path. 3 corresponds to the case where the sheet reversing device 100 shown in FIG. 2 is viewed from the obliquely back side.

  Here, in the present embodiment, each part of the paper P passing through the paper reversing device 100 is defined as follows. First, the paper P has a rectangular shape, and in the paper P that is carried into the carry-in route Ra from the third transport path R3, the top in the transport direction is referred to as a paper front end Pl, and the tail in the transport direction is the rear end of the paper. Called Pt. Further, in the paper P carried into the carry-in route Ra from the third transport route R3, the left end in the transport direction is referred to as a paper first side end Ps1, and the right end in the transport direction is referred to as a paper second side end Ps2. Further, in the paper P carried into the carry-in route Ra from the third transport route R3, the surface facing upward is called a paper surface Pf, and the surface facing downward is called a paper back surface Pb.

  Here, in the present embodiment, the paper front end Pl is on the front side, the paper rear end Pt is on the rear side, the paper first side end Ps1 is on the first side, and the paper second side end Ps2 is on the second side. Correspond to the sides of each.

  In the carry-in path Ra, the sheet surface Pf faces upward from the third conveyance path R3, and the sheet first side end Ps1 and the sheet second side end Ps2 with the sheet leading edge Pl as the head and the sheet trailing edge Pt as the tail. The paper P is fed along the carry-in direction Da1 following the above. Further, from the carry-in route Ra, the paper surface Pf faces upward toward the reverse route Rb, the paper first side end Ps1 is the head, the paper second side end Ps2 is the tail, and the paper front end Pl and the rear of the paper The paper P is sent out along the delivery direction Da2 that follows the end Pt.

  From the carry-in route Ra, the paper surface Pf faces upward, and the reverse route Rb follows the paper leading edge Pl and the paper trailing edge Pt with the paper first side end Ps1 as the head and the paper second side edge Ps2 as the tail. The paper P is sent along the reverse direction Db. The delivery direction Da2 and the reverse direction Db are in the same direction at the boundary between the carry-in route Ra and the reverse route Rb. Here, the reversing direction Db has a curved shape (U-shape), and the sheet P conveyed in the reversing path Rb is a sheet first side end Ps1 and a sheet second side end Ps2 when viewed from above. Is reversed, and the relationship between the front and back surfaces (sheet front surface Pf and paper back surface Pb) is reversed and conveyed. Thereby, from the reverse path Rb, the reverse surface Pb faces upward, and the reverse direction follows the paper leading edge Pl and the paper trailing edge Pt with the paper first side end Ps1 as the head and the paper second side edge Ps2 as the tail. The paper P is sent out along Db.

  From the reverse path Rb, the sheet back surface Pb faces upward, and the sheet discharge path Rc follows the sheet leading edge Pl and the sheet trailing edge Pt with the sheet first side end Ps1 as the head and the sheet second side end Ps2 as the tail. The paper P is sent along the receiving direction Dc1. Note that the reversal direction Db and the receiving direction Dc1 are in the same direction at the boundary between the reversal path Rb and the carry-out path Rc. Further, from the carry-out route Rc, the paper back surface Pb faces upward toward the fourth transport route R4, and the paper first side end Ps1 and the paper first end are formed with the paper leading edge Pl as the head and the paper trailing edge Pt as the tail. The paper P is sent out along a carry-out direction Dc2 that follows the second side end Ps2.

  Here, in the present embodiment, the loading direction Da1 is the first direction, the delivery direction Da2 is the second direction, the reverse direction Db is the third direction, the receiving direction Dc1 is the fourth direction, and the unloading direction Dc2 is Each corresponds to the fifth direction. In addition, the carry-in route Ra and the carry-out route Rc correspond to the carrying route, respectively. Further, in the carry-in route Ra, the carry-in direction Da1 corresponds to the input direction, and the delivery direction Da2 corresponds to the output direction. Furthermore, in the carry-out route Rc, the receiving direction Dc1 corresponds to the input direction, and the carry-out direction Dc2 corresponds to the output direction.

  As described above, in the paper reversing device 100 according to the present embodiment, the traveling direction of the paper P supplied from the third transport path R3 is changed by 90 ° in the carry-in path Ra and is supplied to the reverse path Rb. The paper P supplied from the paper is rotated 180 ° in the reversing path Rb so that the front and back are reversed and supplied to the carry-out path Rc, and the traveling direction of the paper P supplied from the reverse path Rb is 90 in the carry-out path Rc. The angle is changed and supplied to the fourth transport path R4. At this time, the carry-in direction Da1 in the carry-in route Ra and the carry-out direction Dc2 in the carry-out route Rc are in the same direction. Then, before and after passing through the paper reversing device 100, the relationship between the paper front end Pl and the paper rear end Pt does not change before and after the paper reversing device 100 passes. By reversing the relationship, the paper front surface Pf and the paper back surface Pb are reversed.

<Configuration of each transport path and each transport unit>
FIG. 4 is a diagram for explaining the configuration of each conveyance path and each conveyance unit in the sheet reversing apparatus 100 according to the present embodiment. FIG. 4 shows a state where the carry-in route Ra, the reverse route Rb, and the carry-out route Rc in the paper reversing device 100 are developed on a plane.

  The sheet reversing device (reversing conveyance unit) 100 is provided in the carry-in unit 210, and an upstream reverse conveyance that conveys the paper P along the carry-in direction Da1 and the carry-in conveyance unit 300 that conveys the paper P along the delivery direction Da2. 400A. The sheet reversing device 100 includes a midstream-side reversing and conveying unit 400B that is provided in the reversing unit 220 and conveys the sheet P along the reversing direction Db. Furthermore, the sheet reversing device 100 includes a downstream-side reversing conveyance unit 400C that conveys the sheet P along the receiving direction Dc1 and a carry-out conveyance unit 500 that conveys the sheet P along the unloading direction Dc2. I have. In the present embodiment, the upstream reversal conveyance unit 400A provided in the carry-in unit 210, the midstream reversal conveyance unit 400B provided in the reversal unit 220, and the downstream reverse conveyance unit 400C provided in the carry-out unit 230 are collected together. This is referred to as a reverse conveyance unit 400.

  Here, in the present embodiment, the carry-in transport unit 300 is the first transport unit, the upstream reversal transport unit 400A is the second transport unit, the midstream reversal transport unit 400B is the third transport unit, and the downstream reverse transport. The part 400C corresponds to the fourth transport part, and the carry-out transport part 500 corresponds to the fifth transport part. In the carry-in unit 210, the carry-in conveyance unit 300 corresponds to the input conveyance unit, and the upstream reverse conveyance unit 400A corresponds to the output conveyance unit. Further, in the carry-out unit 230, the downstream reverse conveyance unit 400C corresponds to the input conveyance unit, and the carry-out conveyance unit 500 corresponds to the output conveyance unit.

  Among these, the carry-in conveyance unit 300 provided in the carry-in unit 210 is, in order from the upstream side in the carry-in direction Da1, the first carry-in roll pair 301, the second carry-in roll pair 302, and the third carry-in that are closest to the third conveyance path R3. A roll pair 303, a fourth carry-in roll pair 304, a fifth carry-in roll pair 305, and a sixth carry-in roll pair 306 are provided. On the other hand, the upstream reversing conveyance unit 400A provided in the carry-in unit 210 includes, in order from the upstream side in the delivery direction Da2, an upstream first reversing roll pair 401, an upstream second reversing roll pair 402, and an upstream third reversing roll pair. 403 and an upstream fourth inversion roll pair 404 closest to the inversion path Rb.

  In addition, the middle flow side reversal conveyance unit 400B provided in the reversing unit 220 includes, in order from the upstream side in the reversal direction Db, the middle flow side first reversal roll pair 411, the middle flow side second reversal roll pair 412, and The middle flow side third reverse roll pair 413 closest to the carry-out route Rc is provided.

  Further, the downstream reversing conveyance unit 400C provided in the carry-out unit 230 includes, in order from the upstream side in the receiving direction Dc1, the downstream first reversing roll pair 421, the downstream second reversing roll pair 422, and the downstream side closest to the reversing path Rb. A side third reverse roll pair 423 and a downstream side fourth reverse roll pair 424 are provided. On the other hand, the unloading / conveying unit 500 provided in the unloading unit 230 includes a first unloading roll pair 501, a second unloading roll pair 502, a third unloading roll pair 503, and a fourth unloading roll pair 504 in order from the upstream side in the unloading direction Dc2. , A fifth carry-out roll pair 505, and a sixth carry-out roll pair 506 closest to the fourth transport path R4.

  In the carry-in route Ra, between the third carry-in roll pair 303 and the fourth carry-in roll pair 304 that constitute the carry-in conveyance unit 300, the upstream first reverse roll pair 401 through the upstream reverse conveyance unit 400A. The upstream third reverse roll pair 403 is disposed. On the other hand, in the carry-out route Rc, the downstream second reverse roll pair 422-constituting the downstream reverse feed section 400C between the third carry-out roll pair 503 and the fourth carry-out roll pair 504 constituting the carry-out transport section 500. A downstream fourth reverse roll pair 424 is arranged.

  Here, in the present embodiment, in the conveyance of the sheet P from the third conveyance path R3 to the carry-in path Ra, the sheet first side end Ps1 and the sheet second side end Ps2 (both in FIG. 3) of the sheet P being conveyed. The center position of the reference) is made to coincide with the carry-in direction conveyance reference line La set linearly with respect to the third conveyance route R3 and the carry-in route Ra. In the carry-in route Ra, the first carry-in roll pair 301 to the sixth carry-in roll pair 306 constituting the carry-in conveyance unit 300 are respectively arranged so as to straddle the carry-in direction conveyance reference line La.

  In the present embodiment, in the conveyance of the paper P from the carry-in route Ra to the carry-out route Rc via the reverse route Rb, the position of the paper leading edge Pl (see FIG. 3) of the conveyed paper P is determined as the carry-in route. It is made to correspond to the reverse direction conveyance reference line Lb set linearly with respect to Ra, the reverse route Rb, and the carry-out route Rc. Here, the reversal direction conveyance reference line Lb passes on the downstream side of the carry-in direction Da1 with respect to the sixth carry-in roll pair 306 constituting the carry-in conveyance unit 300 in the carry-in route Ra, and in the carry-out route Rc, the carry-out conveyance unit. It passes through the downstream side in the carry-out direction Dc2 with respect to the sixth carry-out roll pair 506 constituting 500.

  Further, in the present embodiment, in transporting the paper P from the carry-out route Rc to the fourth transport route R4, the paper first side end Ps1 and the paper second side end Ps2 (both see FIG. 3) of the transported paper P. ) Is made to coincide with the carry-out direction conveyance reference line Lc set linearly with respect to the fourth conveyance route R4 and the carry-out route Rc. In the carry-out route Rc, the first carry-out roll pair 501 to the sixth carry-out roll pair 506 constituting the carry-out conveyance unit 500 are arranged so as to straddle the carry-out direction conveyance reference line Lc.

<Configuration of transport roll pair>
FIG. 5 is a diagram for explaining the configuration of a pair of conveyance rolls provided in each conveyance unit of the sheet reversing device 100. Here, FIG. 5A shows an example of the configuration of the first carry-in roll pair 301 in the carry-in conveyance unit 300 provided in the carry-in unit 210. FIG. 5B shows an example of the configuration of the upstream first reversing roll pair 401 in the upstream reversing conveyance unit 400 </ b> A provided in the carry-in unit 210. Further, FIG. 5C shows an example of the configuration of the middle flow side second reversing roll pair 412 in the middle flow side reversing conveyance unit 400 </ b> B provided in the reversing unit 220. Furthermore, FIG. 5D shows an example of the configuration of the downstream fourth reverse roll pair 424 in the downstream reverse transfer section 400 </ b> C provided in the carry-out section 230. FIG. 5E shows an example of the configuration of the first unloading roll pair 501 in the unloading / conveying unit 500 provided in the unloading unit 230.

  As shown in FIG. 5A, the first carry-in roll pair 301 that constitutes the carry-in transport unit 300 is disposed to face the carry-in main roll 300a that rotates by receiving an external drive, and the carry-in main roll 300a. A carry-in driven roll 300b that rotates as the carry-in main driven roll 300a rotates. Further, the second carry-in roll pair 302 to the sixth carry-in roll pair 306 (see FIG. 4) constituting the carry-in transport unit 300 also include a carry-in main roll 300a and a carry-in follower roll 300b. In this embodiment, the first carry-in guide plate 211 in which the carry-in main rolls 300a constituting the first carry-in roll pair 301 to the sixth carry-in roll pair 306 are fixed on the carry-in section 210 (see FIG. 2). (See FIG. 2), each carry-in driven roll 300b constituting the first carry-in roll pair 301 to the sixth carry-in roll pair 306 is movable on the movable side (openable and closable side) in the carry-in section 210 (see FIG. 3). ) To the second carry-in guide plate 212 (see FIG. 3).

  The first carry-in roll pair 301 to the sixth carry-in roll pair 306 each have a function as a pair of rotating bodies, and in these, each carry-in main roll 300a serves as a main rotary body and each carry-in follower. Each of the rolls 300b functions as a driven rotating body.

Here, the carry-in main roll 300a includes a shaft 3001a made of metal and extending along the delivery direction Da2 in the carry-in route Ra (see FIG. 4), and two rubber rolls 3002a attached to the shaft 3001a. . And in the carrying-in main drive roll 300a, each rubber roll 3002a has a columnar shape.
On the other hand, the carry-in driven roll 300b is made of metal and extends along the delivery direction Da2 in the carry-in path Ra (see FIG. 4), and two shafts provided on the carry-in main roll 300a with respect to the shaft 3001b. It has two resin rolls 3002b that are attached to the rubber rolls 3002a and opposite positions. In the carry-in driven roll 300b, in each resin roll 3002b, one end side which is the downstream side in the delivery direction Da2 has a cylindrical shape, while the other end side which is the upstream side in the delivery direction Da2 is tapered (tapered portion). )have.

  As shown in FIG. 5B, the upstream first reversing roll pair 401 constituting the upstream reversing conveyance unit 400A is opposed to the reversing main driving roll 400a that rotates by receiving driving from the outside, and the reversing main driving roll 400a. And a reverse driven roll 400b that rotates in accordance with the rotation of the reverse main drive roll 400a. Also, the upstream second reverse roll pair 402 to the upstream fourth reverse roll pair 404 (see FIG. 4) constituting the upstream reverse conveyance unit 400A are each provided with a reverse main driving roll 400a and a reverse driven roll 400b. Yes. And in this Embodiment, each reversal main driving roll 400a which comprises the upstream 1st inversion roll pair 401-the upstream 4th inversion roll pair 404 becomes the 1st which becomes a fixed side in the carrying-in part 210 (refer FIG. 2). Each reverse driven roll 400b, which is attached to the carry-in guide plate 211 (see FIG. 2) and constitutes the upstream first reverse roll pair 401 to the upstream fourth reverse roll pair 404, has a carry-in portion 210 (see FIG. 2). 2 is attached to a second carry-in guide plate 212 (see FIG. 2) which is the movable side (openable and closable side).

  The upstream first inversion roll pair 401 to the upstream fourth inversion roll pair 404 each have a function as a pair of rotating bodies. In these, each of the inversion main driving rolls 400a is used as a main driving rotary body. Each reverse driven roll 400b functions as a driven rotating body. Further, in the upstream side first reversing roll pair 401 to the upstream side fourth reversing roll pair 404, each reversal driven roll 400a is an output side driven rotating body, and each reversing driven roll 400b is an output side driven rotating body, respectively. It is functioning.

Here, the reverse driving roll 400a in the upstream reverse conveyance section 400A is made of metal and extends along the loading direction Da1 in the loading path Ra (see FIG. 4), and two shafts 4001a attached to the shaft 4001a. And a rubber roll 4002a. And in the reverse main drive roll 400a in the upstream reverse conveyance part 400A, each rubber roll 4002a has a columnar shape.
On the other hand, the reverse driven roll 400b in the upstream reverse conveyance section 400A is made of metal and extends along the carry-in direction Da1 in the carry-in path Ra (see FIG. 4), and the reverse main driven roll with respect to the shaft 4001b. Two rubber rolls 4002a provided in 400a and two resin rolls 4002b attached to positions facing each other are provided. And in the reverse driven roll 400b in the upstream reverse conveyance section 400A, in each resin roll 4002b, one end side which is the downstream side in the loading direction Da1 has a columnar shape, while the other end side which is the upstream side in the loading direction Da1 is It has a tapered shape (tapered portion).
In the upstream fourth reverse roll pair 404, in the reverse main drive roll 400a, four rubber rolls 4002a are attached to one shaft 4001a, and in the reverse follower roll 400b, four resin rolls are provided in one shaft 4001b. 4002b is attached.

  As shown in FIG. 5C, the middle-stream-side second reversing roll pair 412 constituting the middle-stream-side reversing conveyance unit 400B is opposed to the reversing main driving roll 400a that rotates by receiving driving from the outside, and the reversing main driving roll 400a. And a reverse driven roll 400b that rotates in accordance with the rotation of the reverse main drive roll 400a. Further, the middle flow side first reversing roll pair 411 and the middle flow side third reversing roll pair 413 (see FIG. 4) constituting the middle flow side reversing conveyance unit 400B also include a reversing main driving roll 400a and a reversing driven roll 400b, respectively. Yes. And in this Embodiment, each reversal main driving roll 400a which comprises middle flow side 1st reversal roll pair 411-middle flow side 3rd reversal roll pair 413 becomes the fixed side in reversing part 220 (refer to Drawing 2). Each reversing driven roll 400b, which is attached to the reversing guide plate 221 (see FIG. 2) and forms the middle flow side first reversing roll pair 411 to the middle flow side third reversing roll pair 413, is a reversing unit 220 (see FIG. 2). 2 is attached to a second reversing guide plate 222 (see FIG. 2) which is the movable side (openable and closable side).

Here, the reversal main driving roll 400a in the middle flow side reversing conveyance unit 400B is made of metal and intersects the reversing direction Db in the reversing path Rb (see FIG. 4) and extends along the loading direction Da1 and the unloading direction Dc2. 4001a and four rubber rolls 4002a attached to the shaft 4001a. And in the reverse main drive roll 400a in the middle flow side reverse conveyance part 400B, each rubber roll 4002a has a columnar shape.
On the other hand, the reverse driven roll 400b in the middle flow side reverse conveyance section 400B is made of metal, intersects the reverse direction Db in the reverse path Rb, and extends along the carry-in direction Da1 and the carry-out direction Dc2, and the shaft 4001b. On the other hand, there are provided four rubber rolls 4002a provided on the reversal main driving roll 400a and four resin rolls 4002b attached at positions facing each other. And in the reverse driven roll 400b in the middle flow side reverse conveyance part 400B, each resin roll 4002b has a cylindrical shape, respectively.

  As shown in FIG. 5D, the downstream fourth reverse roll pair 424 constituting the downstream reverse conveyance unit 400C is opposed to the reverse main roll 400a that rotates by receiving an external drive, and the reverse main roll 400a. And a reverse driven roll 400b that rotates in accordance with the rotation of the reverse main drive roll 400a. Further, the downstream first reverse roll pair 421 to the downstream third transport roll pair 423 (see FIG. 4) constituting the downstream reverse transport unit 400C also include the reverse main driving roll 400a and the reverse driven roll 400b, respectively. Yes. And in this Embodiment, each inversion main driving roll 400a which comprises the downstream 1st inversion roll pair 421- downstream 4th inversion roll pair 424 becomes the 1st which becomes a fixed side in the carrying-out part 230 (refer FIG. 2). Each reverse driven roll 400b that is attached to the carry-out guide plate 231 (see FIG. 2) and that constitutes the downstream first reverse roll pair 421 to the downstream fourth reverse roll pair 424 is a carry-out portion 230 (see FIG. 2). Are attached to a second carry-out guide plate 232 (see FIG. 3) which is a movable side (a side which can be opened and closed).

  In addition, each of the downstream first inversion roll pair 421 to the downstream side fourth inversion roll pair 424 has a function as a pair of rotating bodies, and in these, each inversion main driving roll 400a is used as a main driving rotor. Each reverse driven roll 400b functions as a driven rotating body. Furthermore, in the downstream first inversion roll pair 421 to the downstream side fourth inversion roll pair 424, each inversion driven roll 400a is an input side driven rotating body, and each inversion driven roll 400b is an input side driven rotating body, respectively. It is functioning.

Here, the reversal main driving roll 400a in the downstream reversing conveyance unit 400C is made of metal and extends along the unloading direction Dc2 in the unloading route Rc (see FIG. 4), and two shafts 4001a attached to the shaft 4001a. And a rubber roll 4002a. And in the reverse main drive roll 400a in the downstream reverse conveyance part 400C, each rubber roll 4002a has a cylindrical shape.
On the other hand, the reverse driven roll 400b in the downstream side reverse conveyance unit 400C is made of metal and extends along the carry-out direction Dc2 in the carry-out path Rc (see FIG. 4), and the reverse main driven roll with respect to the shaft 4001b. Two rubber rolls 4002a provided in 400a and two resin rolls 4002b attached to positions facing each other are provided. And in the reverse driven roll 400b in the downstream reverse conveyance part 400C, in each resin roll 4002b, the one end side which becomes the downstream of the carrying-out direction Dc2 has a columnar shape, while the other end side which becomes the upstream of the carrying-out direction Dc2 is It has a tapered shape (tapered portion).
In the first reverse roll pair 421 on the downstream side, four rubber rolls 4002a are attached to one shaft 4001a in the reverse driven roll 400a, and four resin rolls are attached to one shaft 4001b in the reverse driven roll 400b. 4002b is attached.

  As shown in FIG.5 (e), the 1st unloading roll pair 501 which comprises the unloading conveyance part 500 is arrange | positioned facing the unloading main driving roll 500a which receives the drive from the outside, and rotates and the unloading main driving roll 500a, A carry-out driven roll 500b that rotates as the carry-out main roll 500a rotates is provided. Moreover, the 2nd unloading roll pair 502-the 6th unloading roll pair 506 (refer FIG. 4) which comprise the unloading conveyance part 500 are respectively provided with the unloading main drive roll 500a and the unloading driven roll 500b. And in this Embodiment, each unloading main driving roll 500a which comprises the 1st unloading roll pair 501-the 6th unloading roll pair 506 is the 1st unloading guide plate 231 used as the fixed side in the unloading part 230 (refer FIG. 2). (See FIG. 2), each carry-out driven roll 500b constituting the first carry-out roll pair 501 to the sixth carry-out roll pair 506 is movable on the movable side (openable and closable side) in the carry-out section 230 (see FIG. 2). ) To the second carry-out guide plate 232 (see FIG. 2).

  The first unloading roll pair 501 to the sixth unloading roll pair 506 each have a function as a pair of rotating bodies, and in these, each unloading main driving roll 500a serves as a main rotating body and each unloading driven body. Each of the rolls 500b functions as a driven rotating body. Further, in the first unloading roll pair 501 to the sixth unloading roll pair 506, each unloading main driving roll 500a functions as an output side main rotating body, and each unloading driven roll 500b functions as an output side driven rotating body. .

Here, the carry-out main roll 500a includes a shaft 5001a that is made of metal and extends along the receiving direction Dc1 in the carry-out path Rc (see FIG. 4), and two rubber rolls 5002a attached to the shaft 5001a. . In the carry-out main roll 500a, the rubber rolls 5002a each have a cylindrical shape.
On the other hand, the unloading driven roll 500b is made of metal and extends along the receiving direction Dc1 in the unloading path Rc (see FIG. 4), and two unloading main driving rolls 500a are provided for the shaft 5001b. There are provided two resin rolls 5002b attached to positions facing the rubber roll 5002a. In the carry-out driven roll 500b, in each resin roll 5002b, one end side that is the downstream side of the receiving direction Dc1 has a cylindrical shape, while the other end side that is the upstream side of the receiving direction Dc1 is a tapered shape (tapered portion). )have.

<Relationship between each transport path and each transport roll pair>
FIG. 6 is a diagram for explaining the relationship between each conveyance path and each conveyance roll pair in the sheet reversing device 100 according to the present embodiment. Here, FIGS. 6A to 6E correspond to FIGS. 5A to 5E, respectively. That is, FIG. 6A shows the relationship between the carry-in route Ra and the first carry-in roll pair 301 in the carry-in unit 210 (see FIG. 2). FIG. 6B shows the relationship between the carry-in route Ra and the upstream first reverse roll pair 401 in the carry-in unit 210 (see FIG. 2). Furthermore, FIG.6 (c) has shown the relationship between the inversion path | route Rb and the middle flow side 2nd inversion roll pair 412 in the inversion part 220 (refer FIG. 2). Furthermore, FIG.6 (d) has shown the relationship between carrying-out path | route Rc and the downstream 4th inversion roll pair 424 in the carrying-out part 230 (refer FIG. 2). FIG. 6E shows the relationship between the carry-out path Rc and the first carry-out roll pair 501 in the carry-out unit 230 (see FIG. 2).

  As shown in FIG. 6A, the carry-in main driving roll 300a and the carry-in driven roll 300b constituting the first carry-in roll pair 301 are configured to be able to contact and be separated from each other. And when the 1st carrying-in roll pair 301 is made to contact, both the carrying-in main roll 300a and the carrying-in driven roll 300b will be in the state which advanced to the carrying-in path | route Ra. On the other hand, when the first carry-in roll pair 301 is separated, the carry-in driven roll 300a moves away from the carry-in driven roll 300b, so that the carry-in driven roll 300b maintains the state of having advanced into the carry-in route Ra. The main roll 300a is retracted from the carry-in route Ra. Note that the second carry-in roll pair 302 to the sixth carry-in roll pair 306 (see FIG. 4) that constitute the carry-in transport unit 300 together with the first carry-in roll pair 301 perform the same contact and separation operation as the first carry-in roll pair 301.

  As shown in FIG. 6B, the reverse main drive roll 400a and the reverse follower roll 400b constituting the upstream first reverse roll pair 401 are configured to be able to contact and be separated from each other. When the upstream first reversing roll pair 401 is brought into contact, both the reversing main driving roll 400a and the reversing driven roll 400b enter the carry-in path Ra. On the other hand, when the upstream first reversing roll pair 401 is separated, the reversing driven roll 400a moves away from the reversing driven roll 400b, so that the reversing driven roll 400b maintains the state of having advanced into the carry-in path Ra. The reverse main roll 400a is in a state of being retracted from the carry-in route Ra. The upstream second reverse roll pair 402 to the upstream fourth reverse roll pair 404 (see FIG. 4), which constitute the upstream reverse conveyance section 400A together with the upstream first reverse roll pair 401, are also upstream first reverse rolls. The same contact / separation operation as the pair 401 is performed.

  As shown in FIG. 6C, the reverse main driving roll 400a and the reverse driven roll 400b constituting the middle-stream-side second reverse roll pair 412 are configured to always contact each other. At this time, both the reverse driven roll 400a and the reverse driven roll 400b enter the reverse path Rb. The middle flow side first reversing roll pair 411 and the middle flow side third reversing roll pair 413 (see FIG. 4), which constitute the middle flow side reversing conveyance unit 400B together with the middle flow side second reversing roll pair 412, are also the middle flow side second reversing roll. Similar to the pair 412, it is configured to always contact.

  As shown in FIG. 6D, the reverse main drive roll 400a and the reverse follower roll 400b constituting the downstream side fourth reverse roll pair 424 are configured to be able to contact and be separated from each other. When the downstream side fourth reverse roll pair 424 is brought into contact, both the reverse main drive roll 400a and the reverse follower roll 400b enter the carry-out path Rc. On the other hand, when the downstream side fourth reverse roll pair 424 is separated, the reverse driven roll 400a moves away from the reverse driven roll 400b, so that the reverse driven roll 400b maintains the state of having advanced into the carry-out path Rc. The reverse main roll 400a is in a state of being retracted from the carry-out route Rc. The downstream side first reverse roll pair 421 to the downstream side third reverse roll pair 423 (see FIG. 4), which constitute the downstream side reverse conveyance unit 400C together with the downstream side fourth reverse roll pair 424, are also downstream side fourth reverse rolls. The same contact / separation operation as the pair 424 is performed.

  As shown in FIG. 6 (e), the carry-out main driving roll 500a and the carry-out driven roll 500b constituting the first carry-out roll pair 501 are configured to be able to contact and be separated from each other. When the first unloading roll pair 501 is brought into contact, both the unloading main driving roll 500a and the unloading driven roll 500b enter the unloading route Rc. On the other hand, when the first carry-out roll pair 501 is separated, the carry-out driven roll 500a moves away from the carry-out driven roll 500b, so that the carry-out driven roll 500b maintains the state of having advanced into the carry-out path Rc. The main roll 500a is retracted from the carry-out route Rc. Note that the second carry-out roll pair 502 to the sixth carry-out roll pair 506 (see FIG. 4) that constitute the carry-out conveyance unit 500 together with the first carry-out roll pair 501 perform the same contact / separation operation as the first carry-out roll pair 501.

<Advance / Retreat Mechanism 600 and Rotation Mechanism 700>
FIG. 7 is a diagram illustrating an example of a configuration of an advance / retreat mechanism 600 that advances and retracts the upstream first inversion roll pair 401 and a rotation mechanism 700 that rotates the upstream first inversion roll pair 401. Here, Fig.7 (a) is the figure which looked at the upstream 1st inversion roll pair 401 and advance / retreat mechanism 600 set to the contact state from the downstream of the carrying-in direction Da1. FIG. 7B is a view of the upstream first inversion roll pair 401 and the advance / retreat mechanism 600 set in the separated state as viewed from the downstream side in the loading direction Da1. Furthermore, FIG.7 (c) is the figure which looked at the upstream 1st inversion roll pair 401, the advance / retreat mechanism 600, and the rotation mechanism 700 which were set to the separation state from the downstream of the delivery direction Da2. Furthermore, FIG.7 (d) is the figure which looked at the rotation mechanism 700 from the downstream of the carrying-in direction Da1.

  The advancing / retreating mechanism 600 according to the present embodiment is attached to an advancing / retreating motor 601 for advancing / retreating the reversing main driving roll 400a in the upstream first reversing roll pair 401 with respect to the reversing driven roll 400b, and a rotation shaft of the advancing / retreating motor 601. A gear train 602 including gears, a main drive cam shaft 603 fixedly attached to one gear constituting the gear train 602, and a main drive cam attached to the main drive cam shaft 603 in two axial directions 604. Further, the advancing / retreating mechanism 600 includes a ball bearing 605 attached to the shaft 4001a of the reversing main driving roll 400a at positions facing the two main driving cams 604 provided on the main driving cam shaft 603, and a reversing main driving roll. Corresponding to each of the main driving side bearing 606 that is attached to both ends of the shaft 4001a of 400a and rotatably supports the reverse main driving roll 400a, and the two main driving side bearings 606, the loading path of the first loading guide plate 211. It is fixedly attached to a surface opposite to the surface forming Ra, and supports the reverse main driving roll 400a via the main driving side bearing 606 so as to be movable to the side approaching the loading path Ra and the side moving away from the loading path Ra. A main drive side bearing guide 607. Further, the advancing / retreating mechanism 600 is attached to both ends of the shaft 4001b of the reverse driven roll 400b in the upstream first reverse roll pair 401, and a driven bearing 611 that rotatably supports the reverse driven roll 400b, and two driven sides. Corresponding to each of the bearings 611, the second carry-in guide plate 212 is fixedly attached to the surface opposite to the surface that forms the carry-in route Ra, and the reverse driven roll 400b approaches the carry-in route Ra and A driven-side bearing guide 612 that is movably supported on the side away from the carry-in route Ra, and both ends are fixedly attached to a surface of the second carry-in guide plate 212 that is opposite to the surface that forms the carry-in route Ra, The center portion of the driven-side bearing 611 is arranged in contact with a portion outside the portion supported by the driven-side bearing guide 612. And a ring 613.

  On the other hand, the rotation mechanism 700 of the present embodiment includes a rotation motor 701 for rotating the reverse main driving roll 400 a in the upstream first reverse roll pair 401, and a motor side pulley 702 attached to the rotation shaft of the rotation motor 701. A roll-side pulley 703 that is fixedly attached to one end of the shaft 4001a in the reverse driving roll 400a, and a timing belt 704 that has an endless shape and is spanned between the motor-side pulley 702 and the roll-side pulley 703; Is provided.

  Then, the operation | movement (it calls a contact operation | movement below) which transfers the upstream 1st inversion roll pair 401 in a separation state to a contact state is demonstrated. In the initial state of the contact operation, the forward / backward motor 601 stops driving, and the upstream first reverse roll pair 401 and the forward / backward mechanism 600 are in the positional relationship shown in FIGS. 7B and 7C. In addition, the rotation mechanism 700 is in a state indicated by a solid line in FIG. Further, in the initial state in the contact operation, the rotation motor 701 stops driving, and the reverse main driving roll 400a and the reverse driven roll 400b constituting the upstream first reverse roll pair 401 both stop rotating. . At this time, the respective resin rolls 4002b provided in the reverse driven roll 400b advance to the carry-in path Ra and are not blocked by the carry-in path Ra, and the rubber rolls 4002a provided in the reverse main roll 400a are carried in the carry-in path Ra. It is put in the position evacuated from.

  In this example, with the start of the contact operation, the rotation motor 701 starts to rotate. Then, with the rotation of the rotation motor 701, the reverse main drive roll 400a of the upstream first reverse roll pair 401 starts rotating via the motor side pulley 702, the timing belt 704, and the roll side pulley 703. At this time, since the reverse driven roll 400a and the reverse driven roll 400b are not in contact with each other, the reverse driven roll 400b remains stopped.

  Next, the advance / retreat motor 601 starts to rotate. Then, with the rotation of the advance / retreat motor 601, each main driving cam 604 starts rotating via the gear train 602 and the main driving cam shaft 603. Then, the advancing / retreating motor 601 stops rotating when each of the main driving cams 604 makes a half rotation from the state shown in FIG. 7B and reaches the state shown in FIG. As the main driving cams 604 rotate, the ball bearings 605 are pushed up by the cam surfaces of the main driving cams 604 toward the loading path Ra. As a result, the reversing main driving roll 400a including the shaft 4001a to which each main driving cam 604 is attached approaches the reversing driven roll 400b facing each other across the carry-in route Ra, advances into the carry-in route Ra, and then the carry-in route. In Ra, each rubber roll 4002a provided on the reverse driven roll 400a and each resin roll 4002b provided on the reverse driven roll 400b contact each other. At this time, when the paper P is present in the carry-in path Ra, the reverse driven roll 400a and the reverse driven roll 400b come into contact with each other through the paper P.

  As the reverse driven roll 400a comes into contact with the reverse driven roll 400b, the reverse driven roll 400b receives a force toward the side away from the carry-in path Ra from the reverse driven roll 400a. As a result, the reverse driven roll 400b tends to move to the side away from the carry-in route Ra. Here, in the present embodiment, the driven bearings 611 attached to both ends of the shaft 4001b of the reverse driven roll 400b approach the carry-in path Ra via the springs 613 attached to the second carry-in guide plate 212. Is receiving the power to For this reason, the reverse driven roll 400b maintains the state where it is supported by the second carry-in guide plate 212 by the driven bearings 611 and the driven bearing guides 612, and is pressed by the reverse driven roll 400a and the spring 613. It stops at a position where the force is balanced.

  On the other hand, as the reverse driven roll 400a comes into contact with the reverse driven roll 400b, the reverse driven roll 400b receives the driving force from the reverse driven roll 400a and starts rotating. At this time, the contact position between the reverse driven roll 400a and the reverse driven roll 400b is inside the carry-in path Ra. When shifting from the separated state to the contact state, the roll-side pulley 703 is moved from the position indicated by the solid line in FIG. 7D to the rotation motor 701 and the motor-side pulley 702 by a broken line in the drawing. Move to the indicated position. At this time, the position fluctuation between the motor-side pulley 702 attached to the rotation motor 701 and the roll-side pulley 703 attached to the reverse main driving roll 400a is absorbed by the timing belt 704. Regardless, the rotation driving of the reverse main driving roll 400a is continued.

  Subsequently, an operation (hereinafter referred to as a separation operation) for shifting the upstream first inversion roll pair 401 in a contact state to a separation state will be described. In the initial state in the separation operation, the forward / backward motor 601 stops driving, and the upstream first reverse roll pair 401 and the forward / backward mechanism 600 are in the positional relationship shown in FIG. 700 is in a state indicated by a broken line in FIG. Further, in the initial state in the separation operation, the rotation motor 701 continues to drive, and both the reverse main driving roll 400a and the reverse driven roll 400b constituting the upstream first reverse roll pair 401 continue to rotate. . At this time, each rubber roll 4002a provided on the reverse driven roll 400a and each resin roll 4002b provided on the reverse driven roll 400b are placed at positions advanced into the carry-in path Ra.

  With the start of the separation operation, the rotation motor 701 stops rotating. Then, as the rotation motor 701 stops rotating, the reverse main drive roll 400a stops rotating together with the motor side pulley 702, the timing belt 704, and the roll side pulley 703. Further, as the reverse main driving roll 400a stops rotating, the reverse driven roll 400b contacting the reverse main driving roll 400a also stops rotating. At this time, if the paper P is present in the carry-in path Ra, the conveyance of the paper P sandwiched between the reverse driven roll 400a and the reverse driven roll 400b is also stopped.

  Subsequently, the forward / backward motor 601 starts to rotate. Then, with the rotation of the advance / retreat motor 601, each main driving cam 604 starts rotating via the gear train 602 and the main driving cam shaft 603. Then, the advancing / retreating motor 601 stops rotating when each of the main driving cams 604 rotates halfway from the state shown in FIG. 7A and reaches the state shown in FIG. As the main driving cams 604 rotate, the ball bearings 605 are pushed down by the cam surfaces of the main driving cams 604 toward the side away from the loading path Ra. As a result, the reversing main driving roll 400a including the shaft 4001a to which each main driving cam 604 is attached moves away from the reversing driven roll 400b facing and in contact with the carry-in route Ra, and in the carry-in route Ra Each rubber roll 4002a provided in the roll 400a is separated from each resin roll 4002b provided in the reverse driven roll 400b, and further retracts from the carry-in path Ra.

  As the reverse driven roll 400a is separated from the reverse driven roll 400b, the reverse driven roll 400b does not receive a force toward the side away from the carry-in path Ra from the reverse driven roll 400a, while the spring 613 and the driven bearing guide. Through 612, the force toward the side approaching the carry-in route Ra is continuously received. As a result, the reverse driven roll 400b tends to move to the side approaching the carry-in route Ra. Here, in the present embodiment, driven-side bearing guides 612 are provided corresponding to the movements of the driven-side bearings 611 attached to both ends of the shaft 4001b of the reverse driven roll 400b toward the loading path Ra. Is regulated by. For this reason, the reverse driven roll 400b is supported by the second carry-in guide plate 212 by the driven bearings 611 and the driven bearing guides 612, and the driven bearing guides 612 by the pressing force of the springs 613. At the position where it hits the end of the loading path Ra side. At this time, each resin roll 4002b provided in the reverse driven roll 400b is placed in a position where the carry-in path Ra is not blocked while maintaining the state of having advanced into the carry-in path Ra.

  When shifting from the contact state to the separated state, the roll-side pulley 703 is moved from the position indicated by the broken line in FIG. 7D to the rotation motor 701 and the motor-side pulley 702 by the solid line in the drawing. Move to the indicated position. At this time, position fluctuations between the motor-side pulley 702 attached to the rotation motor 701 and the roll-side pulley 703 attached to the reverse main driving roll 400a are absorbed by the timing belt 704.

  Here, the upstream first reversing roll pair 401 has been described as an example. However, the upstream second reversing roll pair 402 to the upstream constituting the upstream reversing conveyance unit 400A together with the upstream first reversing roll pair 401. The side fourth reverse roll pair 404 is also provided with an advance / retreat mechanism 600 and a rotation mechanism 700. Moreover, the 1st carrying-in roll pair 301-the 6th carrying-in roll pair 306 which comprises the carrying-in conveyance part 300, the downstream 1st reversing roll pair 421-the downstream 4th reversing roll pair 424 which comprises the downstream reversing conveyance part 400C, The first carry-out roll pair 501 to the sixth carry-out roll pair 506 constituting the carry-out conveyance unit 500 are also provided with an advance / retreat mechanism 600 and a rotation mechanism 700. On the other hand, the middle flow side first reversing roll pair 411 to the middle flow side third reversing roll pair 413 constituting the middle flow side reversing conveyance unit 400B are provided with a rotating mechanism 700 for rotationally driving them. An advance / retreat mechanism 600 for advancing / retreating driving is not provided.

<Reverse transfer operation>
Now, the reverse conveyance operation of the paper P by the paper reversing apparatus 100 of the present embodiment will be described. Here, FIG. 8 is a timing chart for explaining the operation of each transport unit.

  First, as shown in FIG. 4, in the initial state, the first carry-in roll pair 301 to the sixth carry-in roll pair 306 constituting the carry-in transport unit 300 are set to the separated state and the rotation stopped state. Further, the upstream first reverse roll pair 401 to the upstream fourth reverse roll pair 404 constituting the upstream reverse conveying unit 400A are set to the separated state and the rotation stopped state. Further, the middle flow side first reversing roll pair 411 to the middle flow side third reversing roll pair 413 configuring the middle flow side reversing conveyance unit 400B are set in a rotation stopped state. Furthermore, the downstream first inversion roll pair 421 to the downstream side fourth inversion roll pair 424 configuring the downstream inversion conveyance unit 400C are set to the separated state and the rotation stopped state. And the 1st unloading roll pair 501-the 6th unloading roll pair 506 which comprise the unloading conveyance part 500 are set to a separation state and a rotation stop state.

  For example, as shown in FIG. 1, when images are formed on both sides of a sheet P, the sheet is conveyed in the first conveyance path R1 and has an image formed on the first side by each image forming unit 10 and the fixing device 50. P is transported to the third transport path R3 via the second transport path R2. Further, as shown in FIG. 3, in the third transport path R3, the paper P is transported with the paper leading edge Pl as the head and the paper surface Pf facing upward. At this time, the control unit 80 determines the paper on the paper P based on the length (hereinafter referred to as paper width) of the paper P input from the UI 90 or the like from the paper first side end Ps1 to the paper second side end Ps2. The paper P is transported so that the center position of the width overlaps the carry-in direction transport reference line La (see FIG. 4).

  Next, on the third transport path R3, the control unit 80 (FIG. 1) is based on the result (see symbol a in FIG. 8) of the passage of the paper P detected by the paper detection sensor 60 (see FIG. 1). Reference) starts the rotation operation and the contact operation of the carry-in transport unit 300. Accordingly, in the carry-in route Ra, the carry-in conveyance unit 300 is set in a contact state and starts rotating (see symbol b in FIG. 8).

  Subsequently, as shown in FIG. 4, the sheet P moves along the carry-in direction Da <b> 1 from the third carry path R <b> 3 to the carry-in path Ra. At this time, in the carry-in route Ra, the carry-in transport unit 300 is set in a contact state and is rotating. On the other hand, in the carry-in route Ra, the upstream reversing conveyance unit 400A is set to the separated state and stops rotating (refer to symbol c in FIG. 8). Accordingly, the paper P that has entered the carry-in route Ra from the third transport route R3 is sandwiched by the carry-in transport unit 300, and the paper front P1 is at the top and the paper surface Pf is facing upward, and the carry-in direction Da1. Move along. Here, in this embodiment, each reversing driven roll 400b in the upstream reversing conveyance unit 400A set in the separated state remains in the carry-in path Ra (see FIG. 6B). Since the resin roll 4002b provided on each reverse driven roll 400b has a tapered shape (see FIG. 5B), each reverse driven roll 400b transports the paper P along the carry-in direction Da1. It is hard to be a hindrance.

  Then, the control unit 80 determines that the position of the paper front end Pl on the paper P is the reverse conveyance reference line Lb (FIG. 4) based on the elapsed time after the paper detection sensor 60 detects the passage of the paper front end Pl. The rotation operation of the carry-in transport unit 300 is stopped at the timing of reaching (refer to FIG. 8). As a result, the paper P in the carry-in route Ra stops with the paper first side end Ps1 facing the reversing route Rb and the paper surface Pf facing upward. At this time, the paper P that stops in the carry-in path Ra is in a state where the central position of the paper width overlaps with the carry-in direction conveyance reference line La regardless of the size and orientation, and the position of the paper leading edge Pl. Is overlapped with the reverse conveyance reference line Lb.

  Next, the control unit 80 starts the contact operation of the upstream reverse conveyance unit 400A. Along with this, in the carry-in route Ra, the upstream reversal conveyance unit 400A is set in a contact state (see symbol e in FIG. 8). Therefore, in addition to the carry-in main driving rolls 300a constituting the carry-in conveyance unit 300, the reversal main rolls 400a constituting the upstream reverse conveyance unit 400A come into contact with the paper P in the carry-in path Ra.

  Subsequently, the control unit 80 starts the separation operation of the carry-in conveyance unit 300. As a result, each of the carry-in main driving rolls 300a constituting the carry-in transport unit 300 does not come into contact with the paper P in the carry-in path Ra, but the state where the respective reversal main rolls 400a constituting the upstream reverse transport unit 400A are in contact with each other. Is maintained (see symbol f in FIG. 8). Therefore, the paper P is delivered without the paper P being in contact with either the carry-in main roll 300a or the reverse main roll 400a.

  Next, the control unit 80 starts the rotation operation of the upstream reverse conveyance unit 400A. Along with this, in the carry-in route Ra, the upstream-side reverse conveyance unit 400A starts to rotate (see symbol g in FIG. 8). On the other hand, at this time, in the carry-in route Ra, the carry-in transport unit 300 is set to the separated state and stops rotating. Therefore, the paper P that has been stopped in the carry-in path Ra is sandwiched by the upstream-side reversing conveyance unit 400A, and the delivery direction Da2 is set with the paper first side end Ps1 leading and the paper surface Pf facing upward. Move along. Here, in the present embodiment, each carry-in driven roll 300b in the carry-in conveyance unit 300 set in the separated state is still advanced in the carry-in route Ra (see FIG. 6A). Since the resin roll 3002b provided on the driven roll 300b has a tapered shape (see FIG. 5A), each of the carry-in driven rolls 300b conveys the paper P along the delivery direction Da2. It is hard to become an obstacle.

  In this example, the control unit 80 simultaneously starts the contact operations of the upstream-side reverse conveyance unit 400A and the downstream-side reverse conveyance unit 400C (see FIG. 4). Thereby, in the carrying-out path | route Rc, the downstream inversion conveyance part 400C will be in a contact state (refer the code | symbol e of FIG. 8). Furthermore, the control unit 80 simultaneously starts the rotation operations of the upstream-side reversal conveyance unit 400A, the midstream-side reversal conveyance unit 400B, and the downstream-side reversal conveyance unit 400C (see FIG. 4). As a result, the middle flow side reverse conveyance unit 400B starts to rotate in the reverse route Rb, and the downstream side reverse conveyance unit 400C starts to rotate in the carry-out route Rc (see symbol g in FIG. 8).

  At this time, in the carry-in route Ra, the upstream-side reverse conveyance unit 400A is set in a contact state and is rotating. At this time, in the reversing path Rb, the midstream reversing conveyance unit 400B is rotating. Further, at this time, in the carry-out route Rc, the downstream-side reversing conveyance unit 400C is set in a contact state and is rotated. On the other hand, at this time, in the carry-out route Rc, the carry-out conveyance unit 500 (see FIG. 4) is set to the separated state and stops rotating (see the symbol i in FIG. 8).

  Accordingly, the sheet P that has entered the reversing path Rb from the carry-in path Ra is sandwiched between the upstream reversing conveyance unit 400A and the midstream reversing conveyance unit 400B, with the sheet first side end Ps1 at the top and the sheet surface Pf facing upward. , The leading side moves along the reverse direction Db and the rear end moves along the delivery direction Da2. Then, the sheet P that has entered the reversing path Rb is sandwiched by the middle-side reversing conveyance unit 400B, and the sheet back surface Pb is moved upward from the state where the sheet first surface end Ps1 is the top and the sheet surface Pf faces upward. It moves along the reversal direction Db while shifting to the facing state. Thereafter, the sheet P that has entered the unloading path Rc from the reversing path Rb is sandwiched between the downstream reversing and conveying section 400C and the midstream reversing and conveying section 400B, with the sheet first side end Ps1 at the top and the sheet back surface Pb facing upward. , The leading side moves along the receiving direction Dc1 and the trailing end moves along the reverse direction Db. During the period from the carry-in route Ra to the carry-out route Rc via the reverse route Rb, the paper P is transported so that the position of the paper leading edge Pl overlaps the reverse direction transport reference line Lb (see FIG. 4).

  Here, in the present embodiment, each carry-out driven roll 500b in the carry-out conveyance unit 500 set in the separated state remains advancing on the carry-out route Rc (see FIG. 6 (e)). Since the resin roll 5002b provided on the driven roll 500b has a tapered shape (see FIG. 5E), each carry-out driven roll 500b transports the paper P along the receiving direction Dc1. It is hard to become an obstacle.

  Then, the control unit 80 determines that the center position of the sheet width on the sheet P is the unloading direction conveyance reference line Lc (see FIG. 4) based on, for example, the elapsed time since the conveyance of the sheet P by the upstream reverse conveyance unit 400A is started. ) Is stopped at the timing of reaching () (see the symbol j in FIG. 8). As a result, the paper P in the carry-out path Rc stops with the paper leading edge Pl facing the fourth transport path R4 and the paper back surface Pb facing upward. At this time, regardless of the size and orientation of the paper P in the carry-out path Rc, the position of the paper front end Pl overlaps with the reverse conveyance reference line Lb, and the central position of the paper width is carried out. It will be in the state which overlapped with direction conveyance reference line Lc.

Here, in the present embodiment, regardless of the size of the sheet P to be conveyed, the carry-in direction conveyance reference line Lc in the carry-out route Rc from the carry-in direction conveyance reference line La in the carry-in route Ra through the reverse route Rb. The distance to reach is determined. Accordingly, the period during which the paper P is transported from the carry-in route Ra to the carry-out route Rc via the reverse route Rb is constant regardless of the size of the paper P when the transport speed of the paper P is constant. More specifically, during the period in which the upstream side reverse conveyance unit 400A, the middle flow side reverse conveyance unit 400B, and the downstream side reverse conveyance unit 400C rotate, the size of the paper P is set when the conveyance speed of the paper P is constant. Regardless, it is constant.
In this example, the control unit 80 simultaneously starts the rotation stop operation of the upstream reversing conveyance unit 400A, the middle flow reversing conveyance unit 400B, and the downstream reversing conveyance unit 400C (see symbol j in FIG. 8).

  Next, after stopping the paper P in the carry-out route Rc, the control unit 80 starts the contact operation of the carry-out conveyance unit 500, and the carry-out conveyance unit 500 is set in a contact state in the carry-out route Rc ( (See arrow k in FIG. 8). Therefore, the paper P in the carry-out path Rc comes into contact with the carry-out main roll 500a constituting the carry-out conveyance unit 500 in addition to the reverse main rolls 400a constituting the downstream reverse conveyance unit 400C.

  Subsequently, the control unit 80 starts the separation operation of the downstream side reverse conveyance unit 400C. As a result, the reversal main roll 400a constituting the downstream reverse conveyance section 400C does not come into contact with the paper P in the carry-out path Rc, but the state where the carry main roll 500a constituting the carry-out conveyance section 500 is maintained is maintained. (See reference numeral 1 in FIG. 8). Therefore, the paper P is delivered without the paper P being in contact with either the reverse main driving roll 400a or the carry-out main driving roll 500a.

  Next, the paper P moves in the carry-out route Rc along the carry-out direction Dc2. At this time, the control unit 80 starts the rotation operation of the carry-out conveyance unit 500. Thereby, in the carrying-out path | route Rc, the carrying-out conveyance part 500 starts rotation (refer the code | symbol m of FIG. 8). On the other hand, at this time, in the carry-out route Rc, the downstream reversing conveyance unit 400C is set to the separated state and stops rotating. Accordingly, the paper P that has been stopped in the carry-out path Rc moves along the carry-out direction Dc2 while being sandwiched by the carry-out conveyance unit 500, with the paper leading edge Pl as the leading edge and the paper back surface Pb facing upward. To go. Thereafter, the paper P is carried out from the carry-out route Rc to the fourth transport route R4 (see FIG. 4). Here, in the present embodiment, each reversing driven roll 400b in the downstream reversing conveyance unit 400C set in the separated state remains in the carry-out route Rc (see FIG. 6D). Since the resin roll 4002b provided on each reversing driven roll 400b has a tapered shape (see FIG. 5D), each reversing driven roll 400b transports the paper P along the carry-out direction Dc2. It is hard to be a hindrance.

  The control unit 80 stops the rotation operation of the carry-out conveyance unit 500 at the timing after the paper P is carried out from the carry-out path Rc, and further starts the separation operation of the carry-out conveyance unit 500 (reference number n in FIG. 8). reference). Thereby, in the carrying-out path | route Rc, both the downstream inversion conveyance part 400C and the carrying-out conveyance part 500 will be in a separation state.

  Thereafter, as shown in FIG. 1, the paper P whose front and back surfaces are reversed by the paper reversing device 100 is again directed from the fourth transport path R4 to the image forming units 10 and the fixing device 50 via the first transport path R1. Will be transported.

  Here, in the present embodiment, when the carry-in conveyance unit 300, the upstream-side reverse conveyance unit 400A, the midstream-side reverse conveyance unit 400B, the downstream-side reverse conveyance unit 400C, and the carry-out conveyance unit 500 deliver the paper P, respectively. The paper P is delivered while at least one of the transport unit positioned upstream in the transport direction of the paper P and the transport unit positioned downstream in the transport direction of the paper P sandwiches the paper P. I do. Therefore, the sheet P is not in contact with any of the carry-in conveyance unit 300, the upstream-side reverse conveyance unit 400A, the midstream-side reverse conveyance unit 400B, the downstream-side reverse conveyance unit 400C, and the carry-out conveyance unit 500. The delivery of the paper P is performed.

  Further, in the present embodiment, the control unit 80 contacts and separates and stops rotation of the carry-in conveyance unit 300, the upstream reverse conveyance unit 400A, the midstream reverse conveyance unit 400B, the downstream reverse conveyance unit 400C, and the carry-out conveyance unit 500. By controlling the state, the posture of the conveyed paper P is prevented from being disturbed.

  In the present embodiment, the position of the paper leading edge Pl of the paper P that is transported from the transport path Rc toward the fourth transport path R4 along the transport direction Dc2 is the reverse direction transport reference regardless of the size of the paper P. They are aligned on the line Lb. Accordingly, when the transport speed of the paper P is constant during the period until the paper P reaches each image forming unit 10 from the paper reversing device 100 via the fourth transport path R4 and the first transport path R1. It is constant regardless of the size of P. Therefore, when image formation is performed on the second surface of the reversely conveyed paper P, the image formation timing in each image forming unit 10 can be made uniform regardless of the size of the paper P.

  In the present embodiment, the main driving rolls (loading main driving roll 300a, reversing main driving roll 400a, and unloading main driving roll 500a) are retracted from each path in both the transport path Ra and the transport path Rc of the sheet reversing device 100. The reason is as follows. First, since the main roll may be rotationally driven from the outside, when the main roll that is not used for conveyance remains in the path, the main roll that is not used for conveyance depends on another main roll used for conveyance. There is a concern that the conveyance of the paper P may be hindered. In the present embodiment, each main roll includes a rubber roll having a higher coefficient of friction than the resin roll constituting each driven roll, so that the main roll that is not used for conveyance remains in the path. In this case, there is a concern that the main roll not used for conveyance hinders the conveyance of the paper P by the other main roll used for conveyance. Therefore, in the present embodiment, a configuration is adopted in which each driven roll including a resin roll is left in each path in each path, while each main roll that provides a rubber roll is retracted from each path.

<Embodiment 2>
FIG. 9 is a diagram for explaining the relationship between each conveyance path and each conveyance roll pair in the sheet reversing device 100 according to the present embodiment. Here, FIGS. 9A to 9E correspond to FIGS. 5A to 5E, respectively. 9A shows the relationship between the carry-in route Ra and the first carry-in roll pair 301 in the carry-in unit 210 (see FIG. 2). Moreover, FIG.9 (b) has shown the relationship between the carrying-in path | route Ra and the upstream 1st inversion roll pair 401 in the carrying-in part 210 (refer FIG. 2). Furthermore, FIG.9 (c) has shown the relationship between the inversion path | route Rb and the middle flow side 2nd inversion roll pair 412 in the inversion part 220 (refer FIG. 2). Furthermore, FIG.9 (d) has shown the relationship between carrying-out path | route Rc and the downstream 4th inversion roll pair 424 in the carrying-out part 230 (refer FIG. 2). FIG. 9E shows the relationship between the carry-out path Rc and the first carry-out roll pair 501 in the carry-out unit 230 (see FIG. 2).

  As shown in FIG. 9A, the carry-in main driving roll 300a and the carry-in driven roll 300b constituting the first carry-in roll pair 301 are configured to be able to contact and be separated from each other. And when the 1st carrying-in roll pair 301 is made to contact, both the carrying-in main roll 300a and the carrying-in driven roll 300b will be in the state which advanced to the carrying-in path | route Ra. In contrast, when the first carry-in roll pair 301 is separated, the carry-in main roll 300a and the carry-in follower roll 300b move away from each other, so that both the carry-in main roll 300a and the carry-in follower roll 300b retreat from the carry-in path Ra. It will be in the state. Note that the second carry-in roll pair 302 to the sixth carry-in roll pair 306 (see FIG. 4) that constitute the carry-in transport unit 300 together with the first carry-in roll pair 301 perform the same contact and separation operation as the first carry-in roll pair 301.

  As shown in FIG. 9B, the reverse main driving roll 400a and the reverse driven roll 400b constituting the upstream first reverse roll pair 401 are configured to be able to contact and be separated from each other. When the upstream first reversing roll pair 401 is brought into contact, both the reversing main driving roll 400a and the reversing driven roll 400b enter the carry-in path Ra. On the other hand, when the upstream first reversing roll pair 401 is separated, the reversing main driving roll 400a and the reversing driven roll 400b move away from each other so that both the reversing main driving roll 400a and the reversing driven roll 400b are brought into the carry-in path Ra. It will be in a state of being saved from. The upstream second reverse roll pair 402 to the upstream fourth reverse roll pair 404 (see FIG. 4), which constitute the upstream reverse conveyance section 400A together with the upstream first reverse roll pair 401, are also upstream first reverse rolls. The same contact / separation operation as the pair 401 is performed.

  As shown in FIG. 9C, the reverse main driving roll 400a and the reverse driven roll 400b constituting the middle-stream side second reverse roll pair 412 are configured to always contact each other. At this time, both the reverse driven roll 400a and the reverse driven roll 400b enter the reverse path Rb. The middle flow side first reversing roll pair 411 and the middle flow side third reversing roll pair 413 (see FIG. 4), which constitute the middle flow side reversing conveyance unit 400B together with the middle flow side second reversing roll pair 412, are also the middle flow side second reversing roll. Similar to the pair 412, it is configured to always contact.

  As shown in FIG. 9D, the reverse main drive roll 400a and the reverse follower roll 400b constituting the downstream side fourth reverse roll pair 424 are configured to be able to contact and be separated from each other. When the downstream side fourth reverse roll pair 424 is brought into contact, both the reverse main drive roll 400a and the reverse follower roll 400b enter the carry-out path Rc. On the other hand, when the downstream side fourth inversion roll pair 424 is separated, the inversion main driving roll 400a and the inversion driven roll 400b are moved away from each other, so that both the inversion main driving roll 400a and the inversion driven follower 400b are brought into the carry-out path Rc. It will be in a state of being saved from. The downstream side first reverse roll pair 421 to the downstream side third reverse roll pair 423 (see FIG. 4), which constitute the downstream side reverse conveyance unit 400C together with the downstream side fourth reverse roll pair 424, are also downstream side fourth reverse rolls. The same contact / separation operation as the pair 424 is performed.

  As shown in FIG. 9 (e), the carry-out main driving roll 500a and the carry-out driven roll 500b constituting the first carry-out roll pair 501 are configured to be able to contact and be separated from each other. When the first unloading roll pair 501 is brought into contact, both the unloading main driving roll 500a and the unloading driven roll 500b enter the unloading route Rc. On the other hand, when the first unloading roll pair 501 is separated, the unloading main driving roll 500a and the unloading driven roll 500b move away from each other, so that both the unloading main driving roll 500a and the unloading driven roll 500b are retracted from the unloading path Rc. It will be in the state. Note that the second carry-out roll pair 502 to the sixth carry-out roll pair 506 (see FIG. 4) that constitute the carry-out conveyance unit 500 together with the first carry-out roll pair 501 perform the same contact / separation operation as the first carry-out roll pair 501.

  FIG. 10 is a diagram for explaining an example of a configuration of an advance / retreat mechanism 600 that advances and retracts the upstream first inversion roll pair 401. Here, FIG. 10 shows only the reverse driven roll 400b side of the upstream first reverse roll pair 401, and an advance / retreat mechanism 600 that moves the reverse main roll 400a forward and backward and a rotation mechanism 700 that rotates the reverse main roll 400a. Is the same as that described in the first embodiment (see FIG. 7). FIG. 10A shows the reverse driven roll 400b when the contact state is set, and FIG. 10B shows the reverse follower roll 400b when the separation state is set.

  The advancing / retracting mechanism 600 according to the present embodiment is attached to the gear train 602 (see FIG. 7) via a clutch or the like, for example, and to the driven cam shaft 621 at two locations in the axial direction. Driven side cam 622, a lever shaft 623 fixedly attached to the second carry-in guide plate 212, for example, and a lever shaft 623, which is rotatably attached around the shaft. One end side of the driven side cam 622 is on the cam surface of the driven side cam 622. The other end side further includes a lever 624 arranged in contact with the shaft 4001b of the reverse driven roll 400b.

  Here, the upstream first reversing roll pair 401 has been described as an example. However, the upstream second reversing roll pair 402 to the upstream constituting the upstream reversing conveyance unit 400A together with the upstream first reversing roll pair 401. The side fourth reverse roll pair 404 is also provided with an advance / retreat mechanism 600 and a rotation mechanism 700. Moreover, the 1st carrying-in roll pair 301-the 6th carrying-in roll pair 306 which comprises the carrying-in conveyance part 300, the downstream 1st reversing roll pair 421-the downstream 4th reversing roll pair 424 which comprises the downstream reversing conveyance part 400C, The first carry-out roll pair 501 to the sixth carry-out roll pair 506 constituting the carry-out conveyance unit 500 are also provided with an advance / retreat mechanism 600 and a rotation mechanism 700. On the other hand, the middle flow side first reversing roll pair 411 to the middle flow side third reversing roll pair 413 constituting the middle flow side reversing conveyance unit 400B are provided with a rotating mechanism 700 for rotationally driving them. An advance / retreat mechanism 600 for advancing / retreating driving is not provided.

  In this embodiment, by adopting such a configuration, the separation of each pair of rolls constituting the carry-in transport unit 300, the upstream reverse transport unit 400A, the downstream reverse transport unit 400C, and the carry-out transport unit 500 is achieved. Along with the operation, both the primary roll and the secondary roll constituting each roll pair can be retracted from the respective transport paths. Accordingly, in the conveyance of the paper P and the change of the paper conveyance direction in each of the carry-in route Ra and the carry-out route Rc, the conveyance roll pair unrelated to the conveyance is more difficult to prevent the conveyance of the paper P. Further, when the configuration of the present embodiment is adopted, the driven rolls in the respective roll pairs constituting the carry-in conveyance unit 300, the upstream reverse conveyance unit 400A, the downstream reverse conveyance unit 400C, and the carry-out conveyance unit 500 are illustrated in FIG. It is not necessary to provide the taper part shown in 5 etc.

  In the above-described embodiment, the description is omitted, but the paper reversing device 100 stops the conveyance of the paper P without hitting the paper P against a member such as an abutting member (stopper). That is, the conveyance of the paper P is stopped by stopping the rotation of the carry-in conveyance unit 300, the upstream-side reverse conveyance unit 400A, the midstream-side reverse conveyance unit 400B, the downstream-side reverse conveyance unit 400C, and the carry-out conveyance unit 500. Therefore, the stop position of the paper P can be changed by the control of the control unit 80 without changing the position of the butting member.

  In the above-described embodiment, the first carry-in roll pair 301 to the sixth carry-in roll pair 306 constituting the carry-in transport unit 300 are linked to switch the contact / separation state and the rotation stop state at the same time. It is not limited. For example, the structure which controls so that the contact / separation state and rotation stop state of the 1st carrying-in roll pair 301-the 6th carrying-in roll pair 306 may each be switched independently may be sufficient. Specifically, after the sheet P moves from the third transport path R3 into the transport path Ra along the transport direction Da1 and stops the rotation operation of the transport transport unit 300, only the third transport roll pair 303 is transported. The state in contact with the paper P in the path Ra is maintained. On the other hand, the other carry-in roll pairs (the first carry-in roll pair 301, the second carry-in roll pair 302, the fourth carry-in roll pair 304 to the sixth carry-in roll pair 306) may be separated from the paper P.

Moreover, the structure which controls each upstream 1st inversion roll pair 401-upstream 3rd inversion roll pair 403 which comprises 400 A of upstream reverse conveyance parts each independently may be sufficient. Moreover, the structure which controls each downstream 1st inversion roll pair 421- downstream 3rd conveyance roll pair 423 which comprises the downstream inversion conveyance part 400C each independently may be sufficient. Moreover, the structure which controls independently the 1st unloading roll pair 501-6th unloading roll pair 506 which comprise the unloading conveyance part 500 may be sufficient.
Furthermore, although the structure which switches the contact / separation state and the rotation stop state in conjunction with the upstream reversal conveyance unit 400A and the downstream reversal conveyance unit 400C has been described, the present invention is not limited to this. A configuration may be employed in which the upstream reversal conveyance unit 400A and the downstream reversal conveyance unit 400C are independently controlled.

  For example, when the paper P is delivered from the carry-in conveyance unit 300 to the upstream-side reverse conveyance unit 400A, each of the first carry-in roll pair 301 to the sixth carry-in roll pair 306 and the upstream-side reverse conveyance that constitute the carry-in conveyance unit 300. When the upstream first reverse roll pair 401 to the upstream third reverse roll pair 403 constituting the part 400A are not in contact with each other, the paper P may be misaligned. Further, along with the positional deviation of the paper P, skew (skew) of the paper P, registration deviation (image position deviation), and the like may occur. Although not described above, an air flow (air flow) may occur in the image forming apparatus 1. When an air flow is generated in the image forming apparatus 1, the positional deviation of the paper P is more likely to occur.

  Further, for example, when the paper P is delivered from the carry-in conveyance unit 300 to the upstream reverse conveyance unit 400A, the first carry-in roll pair 301 to the sixth carry-in roll pair 306 constituting the carry-in conveyance unit 300 receive the paper P. If the reversing main driving roll 400a and the reversing driven roll 400b constituting the upstream reversing conveying unit 400A are in contact with each other during conveyance, the paper P may be jammed (paper jam) or the paper P may be damaged. .

  Further, the upstream first reverse roll pair 401 to the upstream fourth reverse roll pair 404 constituting the upstream reverse conveyance section 400A and the downstream first reverse roll pair 421 to the downstream side first constituting the downstream reverse conveyance section 400C. Since it is not necessary to determine the shape of each of the three transport roll pairs 423 according to the distance to the downstream roll, the increase in size is suppressed and the installation area is reduced.

Note that the reverse conveying device may be characterized in that the time during which the first conveying unit and the second conveying unit are in contact with the recording material overlap. Thereby, compared with the case where this structure is not provided, it can suppress that the 1st conveyance part and the 2nd conveyance part simultaneously release a recording material, and the attitude | position of a recording material is disturb | confused.
Moreover, the reverse conveyance apparatus characterized by the time which the said 4th conveyance part and the said 5th conveyance part contact the said recording material overlap. As a result, it is possible to suppress the fourth transport unit and the fifth transport unit from simultaneously releasing the recording material and disturbing the posture of the recording material, as compared with the case where this configuration is not provided.
Moreover, the reverse conveyance apparatus characterized by controlling the contact / separation operation | movement of a said 1st conveyance part, a said 2nd conveyance part, a said 4th conveyance part, and a said 5th conveyance part each independently may be sufficient. Thereby, it can suppress more that the attitude | position of a recording material is disturb | confused.
Moreover, the reverse conveyance apparatus characterized by interlocking the contact / separation operation | movement of a said 1st conveyance part, a said 2nd conveyance part, a said 4th conveyance part, and a said 5th conveyance part may be sufficient. Moreover, the structure which connects a said 1st conveyance part, a said 2nd conveyance part, a said 4th conveyance part, and a said 5th conveyance part by a link mechanism respectively may be sufficient. As a result, the contact / separation mechanism can be further simplified.

DESCRIPTION OF SYMBOLS 1 ... Image forming apparatus, 10 ... Image forming unit, 20 ... Intermediate transfer belt, 30 ... Secondary transfer apparatus, 50 ... Fixing device, 60 ... Paper detection sensor, 70 ... Receiving part, 80 ... Control part, 90 ... User interface Part (UI), 100 ... paper reversing device, 101 ... frame, 200 ... paper guide part, 210 ... carry-in part, 220 ... reversing part, 230 ... carry-out part, 300 ... carry-in conveying part, 400 ... reverse conveying part, 400A ... upstream reversal transport section, 400B ... middle stream reversal transport section, 400C ... downstream reversal transport section, 500 ... unload transport section, Da1 ... carry-in direction, Da2 ... delivery direction, Db ... reversal direction, Dc1 ... receive direction, Dc2 ... Payout direction, P ... paper, R1 ... first transport path, R2 ... second transport path, R3 ... third transport path, R4 ... fourth transport path, Ra ... carry-in path, Rb ... reverse path, Rc ... carry-out path

Claims (7)

The first side and the second side located opposite to the first side, the front side intersecting with the first side and the rear side located opposite to the front side A carrying-in route for carrying in a recording material having
A first transport unit that has a pair of rotating bodies that are arranged so as to be able to come in contact with and separate from each other with the carry-in path interposed therebetween, and that feeds the recording material that is carried in, and transports the recording medium in a first direction with the front side leading ,
A second rotating body having a pair of rotators arranged so as to be able to contact and separate with respect to the carry-in path, and sandwiching the recording material transported by the first transport section, the first side being the top A second transport section for transporting in the direction;
By guiding the recording material connected to the carry-in path and conveyed by the second conveyance unit so that the first side and the second side of the recording material are switched, An inversion path for inverting the front and back surfaces of the recording material;
A third transport unit that is provided in the reversing path and transports the recording material transported by the second transport unit in a third direction in which the first side is the head;
An unloading path for unloading the recording material that is connected to the reversing path and is conveyed in a state where the front and back are reversed by the reversing path and the third conveying unit;
A fourth rotating body having a pair of rotating bodies arranged so as to be able to contact and separate with respect to the unloading path, and sandwiching the recording material conveyed by the third conveying section; A fourth transport section for transporting in the direction;
It has a pair of rotators arranged so as to be able to contact and separate across the carry-out path, sandwiches the recording material conveyed by the fourth conveying unit, and conveys in the fifth direction with the front side leading And a fifth transport unit
The first transport unit, the second transport unit, the third transport unit, the fourth transport unit, and the fifth transport unit are transported downstream from the transport unit upstream in the recording material transport direction. When delivering the recording material to a section, at least one of the upstream conveyance unit and the downstream conveyance unit delivers the recording material while sandwiching the recording material ,
The pair of rotating bodies in at least one of the first transport unit, the second transport unit, the fourth transport unit, and the fifth transport unit is located upstream of the at least one transport unit. When transferring the recording material between the transport unit and / or the transport unit on the downstream side of the at least one transport unit, one of the pair of rotating bodies in the at least one transport unit has a small friction coefficient. A reversing conveyance device that leaves a rotating body in a sheet conveyance path and retreats the other rotating body having a large friction coefficient from the sheet conveyance path . The third transport unit includes a pair of rotators, and when the recording material is transferred between the second transport unit and the fourth transport unit, the two rotators in the pair of rotators are 2. A reversing and conveying apparatus according to claim 1, wherein both of them remain in the sheet conveying path. 3. The reversing and conveying apparatus according to claim 1, wherein the one rotating body in the at least one conveying section is rotated by being driven by the other rotating body that is rotated by receiving an external drive. The first side and the second side located opposite to the first side, the front side intersecting with the first side and the rear side located opposite to the front side A conveying unit that conveys the recording material along the conveying path starting from the front side,
An image forming unit that forms an image on the recording material conveyed by the conveying unit;
When an image is formed on the second surface of the recording material on which the image is formed on the first surface of the recording material by the image forming unit, the first side of the recording material conveyed by the conveying means A reversing conveyance unit that reverses and conveys the front and back of the recording material so that the side and the second side are interchanged with each other,
The reversing conveyance unit is
A carry-in path for carrying the recording material that is connected to the transport path and transported starting from the front side;
A first transport unit that has a pair of rotating bodies that are arranged so as to be able to come in contact with and separate from each other with the carry-in path interposed therebetween, and that feeds the recording material that is carried in, and transports the recording medium in a first direction with the front side leading ,
A second rotating body having a pair of rotators arranged so as to be able to contact and separate with respect to the carry-in path, and sandwiching the recording material transported by the first transport section, the first side being the top A second transport section for transporting in the direction;
By guiding the recording material connected to the carry-in path and conveyed by the second conveyance unit so that the first side and the second side of the recording material are switched, An inversion path for inverting the front and back surfaces of the recording material;
A third transport unit that is provided in the reversing path and transports the recording material transported by the second transport unit in a third direction in which the first side is the head;
An unloading path for unloading the recording material that is connected to the reversing path and is conveyed in a state where the front and back are reversed by the reversing path and the third conveying unit;
A fourth rotating body having a pair of rotating bodies arranged so as to be able to contact and separate with respect to the unloading path, and sandwiching the recording material conveyed by the third conveying section; A fourth transport section for transporting in the direction;
It has a pair of rotators arranged so as to be able to contact and separate across the carry-out path, sandwiches the recording material conveyed by the fourth conveying unit, and conveys in the fifth direction with the front side leading And a fifth transport unit
The first transport unit, the second transport unit, the third transport unit, the fourth transport unit, and the fifth transport unit are transported downstream from the transport unit upstream in the recording material transport direction. When delivering the recording material to a section, at least one of the upstream conveyance unit and the downstream conveyance unit delivers the recording material while sandwiching the recording material ,
The pair of rotating bodies in at least one of the first transport unit, the second transport unit, the fourth transport unit, and the fifth transport unit is located upstream of the at least one transport unit. When transferring the recording material between the transport unit and / or the transport unit on the downstream side of the at least one transport unit, one of the pair of rotating bodies in the at least one transport unit has a small friction coefficient. An image forming apparatus that leaves a rotating body in a sheet conveyance path and retracts the other rotating body having a large friction coefficient from the sheet conveyance path . The first side and the second side located opposite to the first side, the front side intersecting with the first side and the rear side located opposite to the front side A conveyance path for conveying a recording material having
An input transport unit that has a pair of rotating bodies arranged to be able to contact and separate across the transport path, sandwiches the recording material that is carried in, and transports the recording medium in the input direction with the front side leading;
It has a pair of rotators arranged so as to be able to contact and separate across the transport path, sandwich the recording material transported by the input transport unit, and in an output direction in which the first side is the head Including an output conveying unit for conveying,
The input transport unit and the output transport unit receive at least one of the input transport unit and the output transport unit while sandwiching the recording material when delivering the recording material from the input transport unit to the output transport unit. along with the pass,
The pair of rotators in at least one of the input transport unit and the output transport unit is transferred to the pair of rotating members when the recording material is transferred to or from the other transport unit. One of the rotating bodies having a small friction coefficient is left in the paper transport path, and the other rotating body having a large friction coefficient is retracted from the paper transport path .   When delivering the recording material from the input conveying unit to the output conveying unit, the output conveying unit sandwiches the recording material after the conveyance of the recording material by the input conveying unit is stopped, and the output conveying unit The transport apparatus according to claim 5, wherein the input transport unit releases the recording material after the recording material is sandwiched and before the recording material is started to be transported.   The conveyance according to claim 5 or 6, wherein the conveyance of the recording material in the input direction is stopped by stopping the rotation of the pair of rotating bodies of the input conveyance unit without abutting the recording material against another member. apparatus.

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