JP5747605B2 - Paper conveying apparatus and image forming apparatus - Google Patents

Description

  The present invention relates to a sheet conveying device and an image forming apparatus.

  The second cam causes the medium to abut against the stopper by rotating the roller and advancing the medium via the frictional force between the roller and the medium while the stopper is inserted into the medium conveyance path and held by the second cam. A printer that corrects the skew is proposed (for example, see Patent Document 1).

Japanese Patent No. 4147182

  An object of the present invention is to more reliably correct skew of a sheet or the like.

According to one aspect of the present invention, and in a state of being come in contact on a sheet paper at a predetermined speed it is carried and conveying path is conveyed, the provided the transport path so as to face the transport path A contact surface that moves toward the downstream side in the paper conveyance direction at a speed slower than the predetermined speed, a movement mechanism that moves the paper to the downstream side, and a protrusion that protrudes from the contact surface of the movement mechanism A state where the leading end of the paper that is provided and abuts the leading end of the paper that moves toward the downstream side in the conveyance direction while contacting the contact surface, and the leading end abuts the abutting portion A rotating member that sandwiches the sheet conveyed in step 4 together with the moving mechanism and feeds the sheet further downstream, and a conveyance member that is provided downstream of the rotating member in the sheet conveying direction and conveys the sheet further downstream. And a separating means for separating the rotating member and the moving mechanism after the paper sandwiched between the rotating member and the moving mechanism reaches the conveying means, and the separating means and the rotating member and the moving mechanism. And an increasing unit that increases the moving speed of the contact surface after the moving mechanism is separated .
The invention according to claim 2 is configured such that the moving speed of the contact surface can be made different from the conveying speed of the sheet when the sheet is conveyed downstream by the moving mechanism and the rotating member. The sheet conveying apparatus according to claim 1.
The invention according to claim 3 is provided upstream of the moving mechanism in the paper transport direction, and has a function of feeding the paper toward the abutting portion provided on the contact surface. And abutting means for abutting the abutting portion, and when the sheet is abutted against the abutting portion by the abutting means, the abutting means moves toward the downstream side in the sheet conveying direction. The sheet conveying apparatus according to claim 1, wherein the sheet conveying apparatus is a sheet conveying apparatus.
According to a fourth aspect of the present invention, a guide surface that guides the leading end to the base of the abutting portion is formed at a portion of the abutting portion that projects from the contact surface where the leading end of the recording material abuts. 4. The paper transport device according to claim 1, wherein the paper transport device is a paper transport device.
Invention of claim 5, together with the abutting portion where the tip of the paper are butted reaches the rotating member, after the conveyance of the sheet by the rotary member is started, of the paper The paper conveying apparatus according to claim 1, wherein the abutting portion is separated from the leading end.
End an invention according to claim 6, wherein the abutting portion is to be formed by members is attached to the contact surface, located on the contact surface side of said member attached to the contact surface The sheet conveying device according to claim 1, wherein the portion is also embedded in the contact surface .
Induction invention described in claim 7, in the abutting portion against which the tip pick paper, in which the tip of the floated before Symbol contact surface induces the tip to move to the contact surface The sheet conveying device according to claim 1 , wherein a surface is formed.

According to the eighth aspect of the present invention, the recording material is conveyed at a predetermined speed, and the recording material is circulated at a speed slower than the predetermined speed, and the recording material is conveyed downstream in the conveying direction. A moving mechanism for moving the recording material to the downstream side, and a belt member having a guide surface that contacts and guides the leading edge of the recording material conveyed along the conveying path. The recording material is provided so as to protrude from the guide surface and is contacted to the abutting portion where the leading end of the recording material conveyed from the upstream side is abutted with the moving mechanism. A rotating member that sandwiches the recording material that has been transported together with the moving mechanism and sends the recording material further downstream, and is provided further downstream of the rotating member in the recording material transport direction. A conveying means for conveying to the flow side, a separating means for separating the rotating member and the moving mechanism after the recording material sandwiched between the rotating member and the moving mechanism reaches the conveying means, and the separating An increasing means for increasing the moving speed of the belt member after the rotating member and the moving mechanism are separated by the means, an image forming section for forming an image on the recording material conveyed by the conveying means , An image forming apparatus.
The invention according to claim 9, together with the abutting portion where the tip of the serial Rokuzai are butted reaches the rotating member, after the conveyance of the recording medium by the rotary member is started, The image forming apparatus according to claim 8, wherein the abutting portion is separated from the leading end of the recording material.
According to a tenth aspect of the present invention, the rotating member is disposed in contact with the belt member of the moving mechanism, and after the trailing end of the recording material passes between the rotating member and the belt member, the belt member The image forming apparatus according to claim 8 , further comprising an increasing unit that increases the moving speed of the image forming apparatus.
The invention according to claim 11 has a plurality of teeth on the outer peripheral surface meshing with a plurality of teeth formed on the inner peripheral surface of the belt member, and rotationally drives the driving force to the belt member via the teeth. A driving force transmitting member that transmits and moves the belt member, wherein the number of teeth formed on the inner peripheral surface of the belt member is the number of teeth formed on the outer peripheral surface of the driving force transmitting member; The image forming apparatus according to claim 8 , wherein the image forming apparatus is an integer multiple of.

According to the first to fourth aspects of the present invention, correction of the skew of the paper can be performed more reliably than in the case where the present configuration is not provided.
According to the invention of claim 5 , the skew correction of the paper can be more reliably performed as compared with the configuration in which the abutting portion does not reach the rotating member .
According to the invention of claim 6, it is possible suppress may enter the paper between the contact surface and the member attached to the contact surface.
According to the invention of claim 7 , it is possible to increase the possibility that the leading edge of the sheet hits against the base of the abutting portion.

According to the invention of claim 8 , the skew correction of the recording material is more reliably performed as compared with the case where this configuration is not provided.
According to the ninth aspect of the present invention, the skew of the recording material can be corrected more reliably than in the configuration in which the abutting portion does not reach the rotating member .
According to the tenth aspect of the present invention, the abutting portion can be returned to the upstream side in the conveyance direction of the recording material in a shorter time.
According to the eleventh aspect of the present invention, it is possible to suppress the behavior of the abutting portion when the leading end of the recording material abuts against the abutting portion from varying for each recording material.

1 is a diagram when an image forming apparatus to which the exemplary embodiment is applied is viewed from the front side. It is a figure for demonstrating a reverse mechanism. It is a figure for demonstrating the structure of the periphery of the butting member shown in FIG. It is the figure which showed the motion of each part when skew correction is made. FIG. 6 is a diagram illustrating another form of a paper transport system. It is a figure for demonstrating structures, such as a belt. It is the figure which showed other embodiment of the moving mechanism which moves a butting member. It is the figure which expanded and showed the structure of the periphery of a butting member.

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.
FIG. 1 is a diagram of an image forming apparatus to which the exemplary embodiment is applied as viewed from the front side. An image forming apparatus 100 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 an electrophotographic method. I have. Further, in the image forming apparatus 100 of the present embodiment, each apparatus constituting the image forming apparatus 100 and a control unit 80 that controls the operation of each unit are provided. In addition, a user interface unit (UI) 90 that is configured by a display panel and outputs an instruction received from the user to the control unit 80 and presents information from the control unit 80 to the user is provided.

  Further, the image forming apparatus 100 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 the paper 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 a sheet P as an example of a recording material. The image forming apparatus 100 also includes a first paper transport path R1 through which the paper P transported toward the secondary transfer device 30 passes, and a second paper transport through which the paper P after passing through the secondary transfer device 30 passes. A third paper transport path R3 that branches from the second paper transport path R2 downstream of the path R2 and the fixing device 50 (described later) and extends below the first paper transport path R1 is provided.

  In the present embodiment, a reversing mechanism 500 that transports the paper P from the third paper transport path R3 to the first paper transport path R1 and reverses the front and back of the paper P is provided. Furthermore, in this embodiment, an opening 102 is formed in the housing 101 of the image forming apparatus 100. Here, the paper P transported along the second paper transport path R2 is discharged to the outside of the housing 101 through the opening 102 and is stacked on a paper stacking unit (not shown). Note that a processing device (not shown) may be provided adjacent to the housing 101 to further perform processing such as punching the paper P discharged from the opening 102.

  Further, the image forming apparatus 100 is provided with a first paper supply device 410 that supplies the paper P to the first paper transport path R1. Further, a second paper supply device 420 that is provided upstream of the first paper supply device 410 in the conveyance direction of the paper P and supplies the paper P to the first paper conveyance path R1 is provided. The first paper supply device 410 and the second paper supply device 420 are configured in the same manner, and each of the first paper supply device 410 and the second paper supply device 420 has a paper storage unit 41 that stores 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 paper transport path R1 toward the secondary transfer apparatus 30 on the first paper transport path R1 and upstream of the secondary transfer apparatus 30 is provided. Is provided. 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. In addition to these transport rolls, the first paper transport path R1, the second paper transport path R2, and the third paper transport path R3 are transport rolls that transport the paper P located on these paper transport paths. A plurality of 48 are provided.

  In the present embodiment, an abutting member 300 is provided between the second conveying roll 45 and the third conveying roll 46 and is made of stainless steel and against which the leading end of the paper P is abutted. 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 300. Note that after the skew of the paper P is corrected by the abutting member 300, the abutting member 300 is retracted from the first paper transport path R1. In the present embodiment, a fixing device 50 that fixes the image secondarily transferred onto the paper P by the secondary transfer device 30 to the paper P is provided on the second paper transport path R2.

  Further, between the secondary transfer device 30 and the fixing device 50, a transport device 51 that transports the paper P that has passed through the secondary transfer device 30 to the fixing device 50 is provided. Here, the transport device 51 includes a belt 51A that moves around, and transports the paper P by placing the paper P on the belt 51A. The fixing device 50 is provided with 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 is pressurized and heated by passing the paper P between the heating roll 50A and the pressing roll 50B. As a result, the image on the paper P is fixed on the paper P.

  Here, each of the image forming units 10 includes a photosensitive drum 11 that is rotatably mounted. Further, 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 an electrostatic latent image on the photosensitive drum 11 Is provided with a developing device 14 that visualizes the toner with a toner. Further, 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 device 16 that removes residual toner on the photosensitive drum 11 are provided.

  The intermediate transfer belt 20 is provided so as to be stretched over the three roll members 21 to 23. 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.

  Further, in the image forming apparatus 100 of the present embodiment, an image can be formed on one side of the paper P supplied from the first paper supply device 410 and the like, and an image can be formed on the other side of the paper P. It can be formed. More specifically, in this image forming apparatus 100, the front and back of the paper P that has passed through the fixing device 50 are reversed by the reversing mechanism 500, and the paper P with the front and back reversed is conveyed to the secondary transfer device 30 again. The Then, the image is transferred to the other 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 one side of the paper P but also on the other side.

FIG. 2 is a diagram for explaining the reversing mechanism 500.
As described above, in the present embodiment, a plurality of transport rolls 48 that transport the paper P along the third paper transport path R3 are provided in the third paper transport path R3. A plurality of transport rolls 48 that transport the paper P along the first paper transport path R1 are also provided in the first paper transport path R1. The third paper transport path R3 is provided with a transport roll 91 that transports the paper P in a direction orthogonal to (intersects with) the transport direction of the paper P in the third paper transport path R3. In other words, a transport roll 91 that transports the paper P toward the side of the third paper transport path R3 is provided.

  Further, in the present embodiment, the sheet P transported by the transport roll 91 moves upward, and the sheet P moved upward further moves toward the first sheet transport path R1. A guide member 92 for guiding the paper P is provided. Further, in the present embodiment, there is provided a transport roll 93 that nips the paper P guided by the guide member 92 and whose leading end faces upward, and transports the paper P further upward. The first paper transport path R1 is provided with a transport roll 94 that transports the paper P transported by the paper roll 93 to a predetermined location on the first paper transport path R1.

  Each of the transport rolls 48 includes a pair of roll-shaped members, and rotates while sandwiching the paper P between the pair of roll-shaped members to transport the paper P. In FIG. 2, only one roll-shaped member of the pair of roll-shaped members is illustrated. The same applies to the transport roll 91, the transport roll 93, and the transport roll 94, and the paper P is transported by rotating while sandwiching the paper P between a pair of roll-shaped members. Moreover, in this embodiment, one roll-shaped member provided in the conveyance roll 48 can be separated from the other roll-shaped member. The same applies to the transport roll 91 and the transport roll 94, and one roll-shaped member can be separated from the other roll-shaped member. Furthermore, although illustration is omitted, a separation mechanism (not shown) for separating one of these roll members from the other roll member is provided. This separation mechanism is configured by an existing technology such as a motor or a cam.

  When the paper P is turned upside down by the reversing mechanism 500, the paper P is first transported along the third paper transport path R3 by the transport roll 48. At this time, one roll-shaped member of the transport rolls 91 provided in the third paper transport path R3 is separated from the other roll-shaped member. Next, one roll-shaped member of the transport roll 48 is separated from the other roll-shaped member, and one roll-shaped member of the transport roll 91 is pressed against the other roll-shaped member via the paper P.

  Next, the transport roll 91, the transport roll 93, and the transport roll 94 are driven to rotate, and the paper P is transported toward the first paper transport path R1. At this time, one roll-shaped member of the transport roll 48 provided in the first paper transport path R1 is separated from the other roll-shaped member. When the paper P is transported to a predetermined location on the first paper transport path R1, the rotational driving of the transport roll 91, the transport roll 93, and the transport roll 94 is stopped. Thereafter, one roll-shaped member in the transport roll 94 is separated from the other roll-shaped member, and one roll-shaped member of the transport roll 48 provided in the first paper transport path R1 is placed on the other roll via the paper P. Is pressed against the member.

  Next, the transport roll 48 is rotationally driven to transport the paper P along the first paper transport path R1. At this time, the front and back sides of the paper P are already reversed. Here, in the reversing mechanism 500 in the present embodiment, the front and back are reversed without the front end and the rear end in the transport direction of the paper P being interchanged. On the other hand, in the reversing mechanism 500 in the present embodiment, one side end of the sheet (the side end connected to the leading end portion and the rear end portion of the sheet P) and the other side end are interchanged.

FIG. 3 is a diagram for explaining a configuration around the butting member 300 shown in FIG. 1. In addition, the figure (a) is a top view, The figure (b) is a side view.
Although not shown in FIG. 1, an abutting member 300 is placed between the second transport roll 45 and the third transport roll 46 shown in FIG. 1 along the transport direction of the paper P (first paper transport). A moving mechanism 700 is provided for movement along the path R1.

  The moving mechanism 700 includes a driving roll 702 that is rotationally driven by a motor (not shown), an endless belt 704 that circulates and receives a driving force from the driving roll 702, and the upstream side in the transport direction of the paper P from the driving roll 702. A support roll 706 is provided that applies tension to the belt 704 and supports the belt 704 from the inside. In the present embodiment, the drive roll 702 is provided on the downstream side in the transport direction of the paper P with respect to the support roll 706. In this case, tension is applied to a portion of the belt 704 located on the first paper transport path R1 side, and it is possible to suppress the occurrence of slack in the portion of the belt 704 that contacts the paper P. Is done.

  In this embodiment, as shown in FIG. 3A, the width direction of the belt 704 (direction perpendicular to the conveyance direction of the paper P) is applied to both ends of the drive roll 702 and both ends of the support roll 706. A collar portion 708 for restricting the movement of the belt 704 is provided. In addition, illustration of the collar part 708 is abbreviate | omitted in FIG.3 (b). In this embodiment, the abutting member 300 is fixed to the outer peripheral surface of the belt 704 and is provided so as to protrude from the outer peripheral surface. Furthermore, a plurality of abutting members 300 are provided as shown in FIG. 3A, and each of the abutting members 300 is arranged in a state of being arranged at a predetermined interval. Further, each of the abutting members 300 is arranged in a state of being aligned in a direction (width direction of the belt 704) perpendicular to the conveyance direction of the paper P.

  Further, the moving mechanism 700 is provided with a rotating roll 710 as an example of a rotating member that is pressed against the driving roll 702 via the belt 704 and sandwiches the paper P together with the belt 704 and rotates by receiving a driving force from the belt 704. . The rotating roll 710 is formed by a rotating shaft 712 provided along a direction orthogonal to the conveyance direction of the paper P, and a cylindrical contact member 714 that rotates by the rotating shaft 712 and whose outer peripheral surface contacts the paper P. Has been. Here, a plurality of contact members 714 are provided as shown in FIG. Further, the contact members 714 are arranged at different positions in the direction orthogonal to the transport direction of the paper P and are arranged in a state aligned in the direction orthogonal to the transport direction of the paper P. In the present embodiment, a gap G1 is formed between the contact members 714 adjacent to each other. The driving roll 702, the belt 704, and the rotating roll 710 can be regarded as a conveyance unit that conveys the paper P that has moved while abutting the leading end against the abutting member 300 further downstream.

  Here, the abutting member 300 in the present embodiment is provided so as to project from the outer peripheral surface of the belt 704. The abutting member 300 is moved toward the downstream side in the transport direction of the paper P by the moving mechanism 700. Further, in this embodiment, the moving speed of the belt 704 and the third speed are set so that the transport speed of the paper P by the third transport roll 46 (see FIG. 1) is larger than the moving speed (circumferential speed) of the belt 704. The conveyance speed of the paper P by the conveyance roll 46 is set. For this reason, when the paper P is conveyed, the paper P gradually approaches the abutting member 300, and then the leading end of the paper P abuts against the abutting member 300. As a result, the skew of the paper P is corrected.

  FIG. 4 is a diagram illustrating the movement of each unit when skew correction is performed. In the configuration according to the present embodiment, as shown in FIG. 4A, first, the paper P is conveyed from the upstream side by the third conveyance roll 46. Next, when the leading end of the paper P is detected by a paper detection sensor (not shown), the drive roll 702 starts to rotate, and the abutting member 300 starts to move. Thereafter, as shown in FIGS. 2B and 2C, the leading end of the sheet P comes into contact with the outer peripheral surface of the belt 704 functioning as a contact surface and a guide surface, and the leading end is the outer periphery of the belt 704. Guided by the surface. Further, the leading end of the sheet P hits the abutting member 300, and the conveyance of the sheet P is continued in this state. As a result, the leading edge of the paper P comes along a direction orthogonal to the transport direction of the paper P, and the skew of the paper P is corrected. Note that a portion of the belt 704 located on the first sheet conveyance path R1 side can be regarded as a moving portion that moves toward the downstream side in the conveyance direction of the sheet P.

  Thereafter, as shown in FIG. 4D, the abutting member 300 reaches a position exceeding the rotating roll 710, and the paper P is held (nip) by the rotating roll 710 and the belt 704, so that the rotating roll 710 and the belt 704 are retained. The conveyance of the paper P is started. Further, after the conveyance of the paper P by the rotary roll 710 and the belt 704 is started, the abutting member 300 is retracted from the first paper conveyance path R1 as shown in FIG. Separated from the abutting member 300. Here, in the present embodiment, the leading end portion of the paper P is pressed against the abutting member 300 until the paper P is held (nip) by the rotating roll 710 and the belt 704. In addition, in this embodiment, the abutting member 300 is separated from the leading end portion of the paper P after the abutting member 300 passes through the nip portion formed by the rotary roll 710 and the belt 704.

  Here, if the abutting member 300 moves away from the leading end portion of the paper P before the paper P is held by the rotating roll 710 and the belt 704, the skew again until the leading end portion of the paper P reaches the rotating roll 710. There is a risk of it. In the configuration of the present embodiment, as described above, the leading end portion of the paper P is pressed against the abutting member 300 until the paper P is held by the rotary roll 710 and the belt 704. For this reason, the occurrence of another skew is suppressed.

  In the present embodiment, after the sheet P is held by the rotating roll 710 and the belt 704, one of the pair of roll-shaped members constituting the third transport roll 46 as shown in FIG. The roll-shaped member is separated from the other roll-shaped member. Here, in the present embodiment, as described above, the moving speed of the belt 704 is lower than the conveying speed of the paper P by the third conveying roll 46. For this reason, in this embodiment, after the sheet P is held by the rotating roll 710 and the belt 704, the sheet P is pushed into the nip portion formed by the rotating roll 710 and the belt 704.

  For this reason, in the present embodiment, as described above, after the sheet P is held by the rotary roll 710 and the belt 704, one roll-shaped member of the third transport roll 46 is separated from the other roll-shaped member. . Whether or not the sheet P is held by the rotating roll 710 and the belt 704 is determined by detecting the leading end of the sheet P using a sensor (not shown) provided on the downstream side of the rotating roll 710. Can do.

  Thereafter, in the present embodiment, as shown in FIGS. 4E and 4F, the paper P is further transported downstream, and then the second transport roll 45 (see FIG. 1) and the first transport roll 44. Is further conveyed downstream. Although not shown in the drawings, in the present embodiment, after the paper P is held (nip) by the first transport roll 44, a second transport roll is used by using a motor or a cam (not shown) that functions as a separating unit. One roll-shaped member in 45 is separated from the other roll-shaped member, and the rotating roll 710 is further separated from the belt 704. Here, although explanation is omitted above, a sensor for detecting the side edge of the paper P is provided in the present embodiment. Further, in the present embodiment, based on the detection result by this sensor, the first transport roll 44 that nips the paper P is moved in a direction orthogonal to the transport direction of the paper P.

  As a result, the paper P passes through a certain position in a direction orthogonal to the transport direction of the paper P, and an image is formed at an intended location on the paper P. By the way, in this case, if one roll-shaped member of the second transport roll 45 is in contact with the other roll-shaped member and the rotating roll 710 is in contact with the belt 704, the paper P cannot move and the paper P does not move. There is a risk of damage. For this reason, in this embodiment, after the paper P is held (nip) by the first transport roll 44, the separation process is performed as described above. In this embodiment, the rotary roll 710 side is moved to separate the rotary roll 710 and the belt 740, but the belt 704 side can also be moved.

  Here, in the present embodiment, when skew correction is performed by the abutting member 300, as shown in FIGS. 4B and 4C, not the entire sheet P but a part (the front end portion) of the sheet P. The state is placed on the belt 704. By the way, as shown in FIG. 5 (a diagram showing another form of the transport system of the paper P), skew correction is performed while the paper P is transported with the entire paper P placed on the transport belt 709 that moves around. Can also be done. In this case, since the contact area between the paper P and the conveying belt 709 is increased, the frictional resistance is increased and the paper P is difficult to move. In this case, skew correction is difficult to be performed. On the other hand, in the configuration shown in FIG. 4, a part of the paper P, not the whole, is placed on the belt 704, and the paper P is easy to move and skew correction is easily performed.

  Further, a guide member for guiding the paper P is often provided in the transport path of the paper P. However, in the configuration shown in FIG. 4, the belt 704 also has a function of guiding the paper P. Such a guide member can be omitted. In this case, the number of parts can be reduced. In the configuration shown in FIG. 5, the conveyance belt 709 located outside the belt 704 functions as a guide member. In other words, members other than the belt 704 are guide members, and compared to the configuration shown in FIG. Points will increase.

  By the way, as shown in FIG. 3A and the like, when the abutting member 300 is provided so as to project from the outer peripheral surface of the belt 704, a portion other than the base of the abutting member 300 (free end side) Depending on the inclination of the contact member 300, the paper P may swing toward the upstream side in the transport direction or downstream in the transport direction. In this case, the plurality of abutting members 300 may not be aligned in a state where they are aligned in a direction orthogonal to the transport direction of the paper P, and the skew correction of the paper P may not be appropriately performed. On the other hand, the base of the abutting member 300 remains at a fixed position even if the abutting member 300 is inclined.

  Here, in the configuration shown in FIG. 3 and the like, the paper P is placed on the belt 704 to which the abutting member 300 is attached, and the paper P can be abutted against the base of the abutting member 300. . For this reason, in this embodiment, even if a portion other than the base of the abutting member 300 is swung to the upstream side in the transport direction of the paper P or the downstream side in the transport direction, the skew correction of the paper P can be performed. On the other hand, in the configuration shown in FIG. 5, the base of the abutting member 300 is positioned inside the conveying belt 709, and it is difficult to abut the paper P against the base of the abutting member 300. It becomes. In this case, the skew correction of the paper P may not be properly performed.

  Here, in the present embodiment, as described above, the gap G1 is formed between the plurality of contact members 714 provided on the rotating roll 710 (see FIG. 3A), and the rotating roll 710 is reached. The reached abutting member 300 passes through the gap G1. Thereafter, as shown in FIGS. 4E and 4F, the abutting member 300 moves toward the upstream side in the transport direction of the paper P and returns to the original state (the state (a)).

  By the way, after the rotating roll 710 is separated from the belt 704 as described above, the rotational speed of the driving roll 702 can be increased and the moving speed of the belt 704 can be increased. In this case, it returns in a short time due to the state of FIG. Note that if the rotational speed of the drive roll 702 is increased while the rotary roll 710 and the belt 704 are in contact with each other, the paper P is pushed into the second transport roll 45 (see FIG. 1). In the case where the rotary roll 710 is not separated from the belt 704, the rotational speed of the drive roll 702 can be increased after the rear end portion of the paper P passes between the rotary roll 710 and the belt 704. The increase in the rotational speed of the drive roll 702 is realized by the control unit 80 and a motor (not shown) that function as an increase unit.

  Further, in the present embodiment, the case where the upstream third transport roll 46 that feeds the paper P to the abutting member 300 is fixed has been described, but the third transport roll 46 is illustrated in FIG. As shown by the broken line, for example, the abutting member 300 can be moved downstream at the same speed as the moving speed of the abutting member 300. In the aspect described above, the distance between the abutting member 300 and the third transport roll 46 that feeds the paper P to the abutting member 300 gradually increases. In this case, buckling of the paper P occurs between the abutting member 300 and the third transport roll 46, and the contact pressure between the leading end of the paper P and the abutting member 300 may be reduced. On the other hand, when the third transport roll 46 is moved, buckling or the like is unlikely to occur, and the contact pressure between the leading end portion of the paper P and the abutting member 300 is likely to increase. In this case, the skew correction is more reliably performed.

  Here, the skew correction of the paper P can also be performed by abutting the paper P against the stopped abutting member 300. In this case, the paper P generated by the paper P abutting against the abutting member 300 is used. In order to prevent damage to the paper P, it becomes necessary to greatly reduce the transport speed of the paper P or temporarily stop the transport of the paper P. By the way, in this case, the number of sheets P that can be conveyed per unit time decreases, and the productivity tends to decrease. On the other hand, in the configuration according to the present embodiment, the abutting member 300 moves together with the paper P. Therefore, skew correction can be performed without stopping the conveyance of the paper P, and the abutting member 300 is stopped. Productivity increases.

  In the above description, the abutting member 300 is provided at one place in the circumferential direction of the belt 704, but the abutting member 300 may be provided at a plurality of places. In this case, the abutting member 300 can be protruded on the first sheet conveyance path R1 without rotating the belt 704 by 360 °, and the productivity can be further improved. When a plurality of abutting members 300 are provided in this way, it is preferable to adjust the arrangement interval so that the abutting member 300 protrudes at one place on the first paper transport path R1. For example, if the abutting member 300 protrudes on the first paper transport path R1 at two locations on the upstream side in the paper transport direction and the downstream side in the paper transport direction, the paper P may be floated by the one abutting member 300. is there.

FIG. 6 is a diagram for explaining the structure of the belt 704 and the like. 1A is a plan view of the belt 704, and FIG. 1B is a side view showing the belt 704 together with the drive roll 702 and the like.
Although not described above, a plurality of teeth 702A are formed on the outer peripheral surface of a driving roll 702 as an example of a driving force transmitting member. A plurality of teeth 704 </ b> G are also formed on the inner peripheral surface of the belt 704. In this embodiment, the driving force is transmitted from the driving roll 702 to the belt 704 by the teeth 702A formed on the driving roll 702 and the teeth 704G formed on the belt 704 meshing with each other. The teeth 704G are formed over the entire circumference of the belt 704. However, in FIG. 6B, illustration of some of the teeth 704G is omitted for easy understanding of the drawing.

  Here, in this embodiment, the number of teeth 704G (the number of valleys) formed on the belt 704 is an integral multiple of the number of teeth 702A formed on the drive roll 702. Here, the rotational center of the drive roll 702 may be provided eccentrically due to a mechanical error or the like, but in the case of the configuration of the present embodiment, the behavior of the abutting member 300 on the first paper transport path R1 is constant, It is possible to prevent the behavior of the abutting member 300 when the paper P hits the abutting member 300 from being different for each paper P.

  In addition, if the rotation center of the drive roll 702 is eccentric and the number of teeth 704G formed on the belt 704 is not an integral multiple of the number of teeth 702A formed on the drive roll 702, the first paper transport path The phase of the drive roll 702 when the abutting member 300 moves on R1 is different for each sheet P to be transported. In this case, the behavior of the abutting member 300 is different for each paper P. For example, the moving speed of the abutting member 300 when the paper P abuts against the abutting member 300 is different for each paper P. Further, for example, the position of the abutting member 300 when the paper P abuts against the abutting member 300 is different for each paper P.

  On the other hand, when the number of teeth 704G formed on the belt 704 is an integral multiple of the number of teeth 702A formed on the drive roll 702 as in the present embodiment, the abutting member on the first paper transport path R1 The behavior of the paper 300 becomes constant, and the movement speed and position of the abutting member 300 when the paper P abuts against the abutting member 300 can be suppressed from varying for each paper P. As described above, when a plurality of abutting members 300 are provided at different locations in the circumferential direction of the belt 704, the number of teeth 704G provided between the abutting members 300 adjacent to each other is formed on the drive roll 702. It is preferable that the number of teeth 702A is an integral multiple of the number of teeth 702A.

FIG. 7 is a view showing another embodiment of a moving mechanism 700 that moves the abutting member 300. In addition, about the member which has the same function as the member demonstrated above, description is abbreviate | omitted using the same code | symbol. In addition, the figure (a) is a top view, The figure (b) is a side view. FIG. 6C is a cross-sectional view taken along line VIIC-VIIC in FIG.
Also in the moving mechanism 700 in the present embodiment, a drive roll 702 and a support roll 706 are provided as shown in FIG. In this embodiment, in addition to the drive roll 702 and the support roll 706, a first support roll 716 and a second support roll 718 that support the belt 704 are further provided. Here, the drive roll 702, the support roll 706, the first support roll 716, and the second support roll 718 are provided so as to correspond to the four tops of the belt 704 arranged in a rectangular shape.

  Here, the driving roll 702 in the present embodiment is provided on the side away from the first paper transport path R1 and on the downstream side in the transport direction of the paper P. Further, a second support roll 718 is provided on the first paper transport path R1 side with respect to the drive roll 702. Further, the first support roll 716 is provided on the side away from the first paper transport path R1 and upstream in the transport direction of the paper P, and the support roll 706 is on the first paper transport path R1 side of the paper P. It is provided upstream in the transport direction.

  In the present embodiment, the collar portion 708 is provided on the first support roll 716 located at a location away from the paper transport path R1 (see FIG. 7A). Although not shown in the drawings, in this embodiment, the driving roll 702 located at a location away from the paper transport path R1 is also provided with a flange (not shown). For this reason, in the present embodiment, the collar portion 708 does not protrude into the first paper transport path R1 through which the paper P is transported, and the paper P wider than the belt 704 can be transported.

  In the present embodiment, the belt 704 is provided in a state of being divided into a plurality of parts, and four belts of the first belt 704A to the fourth belt 704D are provided. Here, each of the first belt 704 </ b> A to the fourth belt 704 </ b> D is provided in a state of being aligned in a direction orthogonal to the conveyance direction of the paper P. In the present embodiment, the gap G2 is provided between the first belt 704A and the second belt 704B, between the second belt 704B and the third belt 704C, and between the third belt 704C and the fourth belt 704D. Is formed. In the present embodiment, a groove (not shown) for restricting the movement of the first belt 704A to the fourth belt 704D (movement in a direction orthogonal to the conveyance direction of the paper P) is formed in the first support roll 716 and the like. Has been. In this embodiment, as shown in FIG. 7C, four second support rolls 718 are provided so as to correspond to the first belt 704A to the fourth belt 704D.

  In the present embodiment, the abutting member 300 is provided on each of the first belt 704A to the fourth belt 704D. The position of the abutting member 300 is adjusted in advance, and each abutting member 300 is arranged so as to be placed on one straight line orthogonal to the transport direction of the paper P. In the present embodiment, a rotating roll 710 is provided above the second support roll 718. Here, similarly to the above, the rotating roll 710 is formed by a rotating shaft 712 provided along a direction orthogonal to the conveyance direction of the paper P, and a plurality of contact members 714 whose outer peripheral surfaces are in contact with the paper P. .

  Here, each contact member 714 is between the first belt 704A and the second belt 704B, between the second belt 704B and the third belt 704C, and between the third belt 704C and the fourth belt 704D, respectively. It arrange | positions in the formed said gap | interval G2. In the present embodiment, as shown in FIG. 7C, a transport roll 730 is provided that transports the paper P, which is rotated by a motor (not shown) and transported from the upstream side, together with the rotary roll 710 to the downstream side. Yes.

  Here, the transport roll 730 is formed by a rotating shaft 731 that is rotated by a motor (not shown), and a cylindrical contact member 732 that is rotated by the rotating shaft 731 and whose outer peripheral surface is in contact with the paper P. . Here, a plurality of contact members 732 are provided, and a contact member 714 provided on the rotating roll 710 is pressed against each of the contact members 732, and the sheet P conveyed from the upstream side is rotated by the rotating roll. It is nipped by the contact member 714 of 710 and the contact member 732 of the transport roll 730 and transported downstream. In addition, each of the 2nd support roll 718 is supported by the rotating shaft 731 provided in the conveyance roll 730, as shown in FIG.7 (c). In addition, a bearing (not shown) is provided between the second support roll 718 and the rotary shaft 731, and the second support roll 718 is supported by the rotary shaft 731 in a state where the second support roll 718 can rotate with respect to the rotary shaft 731. Has been.

  In this embodiment, the conveyance speed of the paper P by the conveyance roll 730 is equal to the moving speed of the abutting member 300 (the peripheral speed of the outer peripheral surface of the belt 704). Here, when the conveyance speed of the paper P by the conveyance roll 730 is smaller than the moving speed of the abutting member 300, the paper P comes to abut against the conveyance roll 730, and the leading end ( The leading edge) follows the alignment of the transport roll 730. In other words, even though the skew of the paper P is corrected by the abutting member 300, the paper P may abut against the transport roll 730, so that the skew may occur again. For this reason, in the present embodiment, as described above, the conveyance speed of the paper P by the conveyance roll 730 and the movement speed of the abutting member 300 are made equal. In addition, the conveyance speed of the paper P by the conveyance roll 730 can be made larger than the moving speed of the abutting member 300.

  As described above, the rotary roll 710 can be separated from the transport roll 730. Further, after the rotary roll 710 is separated from the transport roll 730, the rotational speed of the drive roll 702 can be increased and the moving speed of the belt 704 can be increased. Similarly to the above, after the trailing edge of the paper P passes between the rotary roll 710 and the belt 704, the rotational speed of the drive roll 702 can be increased.

FIG. 8 is an enlarged view of the structure around the abutting member 300.
Here, the abutting member 300 in this embodiment is inserted into a recess 704F formed in the belt 704, as shown in FIG. For this reason, in this embodiment, the end part located in the belt 704 side of the butting member 300 is in a state of being caught in the belt 704.

  Incidentally, the abutting member 300 can be fixed to the belt 704 by adhering the end surface of the abutting member 300 to the outer peripheral surface of the belt 704. In this case, the abutting member 300 is detached from the belt 704. It becomes easy. In this case, a gap may be formed between the outer peripheral surface of the belt 704 and the abutting member 300. When the gap is formed in this way, the leading end of the paper P enters the gap, and it may be difficult to transport the paper P. For this reason, in this embodiment, it is set as the structure which the front-end | tip part of the abutting member 300 is also caught in the belt 704.

  In the configuration shown in FIG. 8A, the belt 704 has a protruding portion 704 </ b> H that protrudes in a direction away from the outer peripheral surface of the belt 704. In this embodiment, the abutting member 300 is supported by the projecting portion 704H. Specifically, the back side of the abutting member 300 is fixed to the protruding portion 704H by adhesion. In this way, when the abutting member 300 is supported by the protruding portion 704H, the abutting member 300 toward the upstream side in the transport direction of the paper P and the downstream side in the transport direction is compared with the case where the protruding portion 704H is not provided. Falling is suppressed.

  As shown in FIG. 8B, the abutting surface 380 of the abutting member 300 against which the paper P abuts may be given an inclination toward the upstream side in the transport direction of the paper P as it goes upward in the figure. it can. In other words, the abutting surface 380 can be given an inclination toward the upstream side in the transport direction of the paper P as the distance from the outer peripheral surface of the belt 704 increases. In FIG. 8B, a part of the abutting surface 380 (a part located on the side away from the belt 704) is inclined, but the whole abutting surface 380 may be inclined. Here, when the abutting surface 380 is inclined, even if the leading end portion of the paper P is lifted from the surface of the belt 704, the leading end portion of the paper P is moved (induced) by the abutting surface 380. ) In this case, the possibility that the leading end portion of the paper P protrudes from the base of the abutting member 300 where the displacement of the paper P toward the upstream side in the transport direction and the downstream side in the transport direction hardly occurs. Here, the portion of the abutting surface 380 that is inclined can be regarded as a guide surface that guides the leading end of the paper P so that the leading end of the paper P moves toward the belt 704.

  If the thickness of the belt 704 is small, the concave portion 704F (see FIG. 8A) becomes shallow, and the abutting member 300 is easily detached. For this reason, for example, as shown in FIG. 8C, the thickness of the portion of the belt 704 to which the abutting member 300 is attached can be made larger than the thickness of other portions. Further, as shown in FIG. 4D, the thickness of the belt 704 can be increased, and the contact surface 380 can be inclined. If the belt 704 is partially thickened, a step is formed, and the conveyance of the paper P may be restricted by the step. For this reason, in FIGS. 8C and 8D, the thickness of the belt 704 is gradually increased from the upstream side in the transport direction of the paper P toward the downstream side in the transport direction so that no step is formed.

DESCRIPTION OF SYMBOLS 10 ... Image forming unit, 20 ... Intermediate transfer belt, 30 ... Secondary transfer device, 80 ... Control part, 100 ... Image forming device, 300 ... Abutting member, 380 ... Abutting surface, 702 ... Drive roll, 702A ... Teeth, 704 ... Belt, 704G ... Teeth, 710 ... Rotating roll, R1 ... First paper transport path

Claims (11)

A transport path through which paper is transported at a predetermined speed;
Contact surface moves towards the downstream side in the conveying direction of the sheet at a speed slower than said and speed said predetermined the provided the transport path so as to face the conveying path while touch contact with the paper transported A moving mechanism for moving the paper downstream,
An abutting portion that is provided so as to project from the contact surface of the moving mechanism , and that abuts against the leading edge of the paper that moves toward the downstream side in the transport direction while contacting the contact surface;
A rotating member that is disposed in contact with the moving mechanism and sandwiches the paper that has been conveyed in a state in which the tip is in contact with the abutting portion together with the moving mechanism, and further sends the paper to the downstream side;
A transport unit that is provided on the downstream side of the rotating member in the paper transport direction, and transports the paper further downstream;
A separating unit that separates the rotating member and the moving mechanism after a sheet sandwiched between the rotating member and the moving mechanism reaches the conveying unit;
Increasing means for increasing the moving speed of the contact surface after the rotating member and the moving mechanism are separated by the separating means;
A sheet conveying apparatus comprising: 2. The sheet according to claim 1, wherein the moving speed of the contact surface can be made different from the conveying speed of the sheet when the sheet is conveyed downstream by the moving mechanism and the rotating member. Conveying device. Provided upstream of the moving mechanism in the paper conveyance direction, has a function of feeding the paper toward the abutting portion provided on the contact surface, and a bump that abuts the leading edge of the paper against the abutting portion A contact means,
3. The paper according to claim 1, wherein when the paper is abutted against the abutting portion by the abutting means, the abutting means moves toward the downstream side in the paper transport direction. Conveying device. The guide surface for guiding the tip to the base of the abutting portion is formed at a location where the tip of the recording material abuts out of the abutting portion protruding from the contact surface. The sheet conveying apparatus according to any one of 1 to 3. Together with the abutting portion where the tip of the paper are butted it reaches the rotating member, after the conveyance of the sheet by the rotary member is started, the abutting portion is separated from the leading end of the paper The sheet conveying apparatus according to claim 1. The abutting portion is formed by attaching a member to the contact surface ,
Sheet conveying apparatus according to claim 1 or 2, characterized in that the end portion located on the contact surface side of said member attached to the contact surface is sunk into the contact surface. The said abutting portion against which the tip pick paper, characterized in that the guide surface of the tip of the floating state from the previous SL contact surface induces the tip to move the contact surface is formed The sheet conveying apparatus according to claim 1 . A transport path through which the recording material is transported at a predetermined speed;
A guide that performs circulation movement at a speed slower than the predetermined speed and guides the leading edge by contacting the leading edge of the recording material conveyed along the conveying path while moving toward the downstream side in the conveying direction of the recording material. A belt mechanism having a surface, and a moving mechanism for moving the recording material to the downstream side;
An abutting portion provided so as to project from the guide surface of the belt member and against which the leading end of the recording material conveyed from the upstream side is abutted;
A rotating member that is disposed in contact with the moving mechanism and sandwiches the recording material that has been conveyed in a state in which the tip abuts against the abutting portion together with the moving mechanism, and sends the recording material further downstream,
A conveying means provided on the downstream side in the conveying direction of the recording material with respect to the rotating member, and conveying the recording material further downstream;
A separating means for separating the rotating member and the moving mechanism after the recording material sandwiched between the rotating member and the moving mechanism reaches the conveying means;
Increasing means for increasing the moving speed of the belt member after the rotating member and the moving mechanism are separated by the separating means;
An image forming unit that forms an image on the recording material conveyed by the conveying unit ;
An image forming apparatus comprising: Together with the abutting portion where the tip of the serial Rokuzai are butted reaches the rotating member, after the conveyance of the recording medium by the rotary member is started, the thrust from the front end of the recording medium The image forming apparatus according to claim 8, wherein the contact portion is separated. The rotating member is disposed in contact with the belt member of the moving mechanism,
Increasing means for increasing the moving speed of the belt member after the trailing end of the recording material passes between the rotating member and the belt member;
The image forming apparatus according to claim 8 , further comprising: Drive that has a plurality of teeth on the outer peripheral surface meshing with a plurality of teeth formed on the inner peripheral surface of the belt member, and that rotates and transmits the driving force to the belt member via the teeth and moves the belt member A force transmission member;
The number of the teeth formed on the inner peripheral surface of the belt member, to claim 8, characterized in that has a number of integral multiple of the teeth formed on the outer peripheral surface of the driving force transmitting member The image forming apparatus according to claim 10 .

Images