JP2014058369A - Conveying device, and image forming apparatus - Google Patents

Conveying device, and image forming apparatus Download PDF

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JP2014058369A
JP2014058369A JP2012204093A JP2012204093A JP2014058369A JP 2014058369 A JP2014058369 A JP 2014058369A JP 2012204093 A JP2012204093 A JP 2012204093A JP 2012204093 A JP2012204093 A JP 2012204093A JP 2014058369 A JP2014058369 A JP 2014058369A
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recording medium
roller
transport
sandwiching
width
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JP6010861B2 (en
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Itaru Matsumoto
到 松本
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Ricoh Co Ltd
株式会社リコー
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Abstract

A lateral registration correction is performed with high accuracy without causing a problem that a recording medium is skewed by a conveyance resistance after performing vertical registration correction and skew correction without increasing the size of the apparatus. A conveyance device and an image forming apparatus are provided.
A second nipping roller 32 is installed upstream of a first nipping roller 31 on which a locking portion 31b1 for performing vertical registration correction and skew feeding correction is formed, and the length of the recording medium P being conveyed is Accordingly, the lateral registration correction is performed by moving the recording medium P in the width direction with the first clamping roller 31 and the second clamping roller 32 sandwiched based on the amount of lateral registration displacement detected by the detection means 36. Or the recording medium P is moved in the width direction in a state where the recording medium P is sandwiched by the first sandwiching roller 31 without being sandwiched by the second sandwiching roller 32 based on the positional deviation amount of the lateral registration detected by the detecting means 36. Horizontal registration correction.
[Selection] Figure 2

Description

  The present invention relates to a conveyance device that conveys a recording medium, and an image forming apparatus such as a copying machine, a printer, a facsimile, or a multifunction machine or an offset printing machine provided with the same, and more particularly to a recording medium in a conveyance path. The present invention relates to a conveyance device that performs lateral registration correction after performing vertical registration correction and skew feeding correction, and an image forming apparatus.

  2. Description of the Related Art Conventionally, in an image forming apparatus such as a copying machine or a printer, after correcting a positional deviation or skew in a conveyance direction of a recording medium in a conveyance path, the width direction of the recording medium (a direction perpendicular to the conveyance direction). A technique for correcting a position shift (hereinafter referred to as “lateral registration” as appropriate) to a normal position (position shift correction) is known (for example, see Patent Document 1).

  Specifically, in Patent Document 1, a recording medium conveyed along a conveyance path by a plurality of conveyance roller pairs hits a stopper (abutting member) and is subjected to vertical registration correction and skew correction. After that, the recording medium in contact with the stopper moves in the width direction while being sandwiched by a pair of lateral registration rollers (nip rollers) disposed upstream of the stopper, and the lateral registration is corrected. Will be. Thereafter, the recording medium in which the lateral resist is corrected is conveyed toward the image transfer unit.

  Here, in Patent Document 1, when lateral registration correction is performed, in order to reduce the conveyance resistance of the recording medium generated in the upstream conveyance path of the lateral registration roller pair, the upstream side of the lateral registration roller pair is described. A technique for forming a conveyance path in a straight shape or a large curved shape having a curvature radius of 50 mm or more is disclosed.

  On the other hand, in Patent Document 2, an engaging portion (abutment) that protrudes to a part of a roller circumferential surface as the roller rotates is provided on one of the nipping rollers (a nipping and conveying roller pair) that nipping and conveying the recording medium. A technique for performing vertical registration correction and skew correction of the recording medium by forming a member) and abutting the leading end of the recording medium against the engaging portion is disclosed.

The technique of Patent Document 1 reduces the recording medium conveyance resistance generated in the conveyance path on the upstream side of the lateral registration roller pair when the lateral registration correction is performed, so that the recording medium is placed on the stopper (abutting member). After abutting and performing vertical registration correction and skew feeding correction, it is possible to expect an effect of preventing the recording medium from skewing due to the conveyance resistance and the accuracy of horizontal registration correction from being lowered.
However, since the conveyance path on the upstream side of the lateral registration roller pair is formed in a straight shape or a large curved shape having a curvature radius of 50 mm or more, the entire apparatus has been enlarged.

  In order to solve such a problem, by applying the technique of Patent Document 2, instead of a stopper (abutting member) installed on the downstream side of the lateral registration roller pair, on one roller in the lateral registration roller pair, A method of shortening the length of the conveyance path on the downstream side of the pair of horizontal registration rollers by forming a locking portion that protrudes at a part of the circumferential surface of the roller as the roller rotates can be considered. However, even in such a case, the conveyance path on the upstream side of the pair of horizontal registration rollers remains formed in a straight shape or a large curved shape having a curvature radius of 50 mm or more. It will not be possible.

  The present invention has been made to solve the above-described problems, and the recording medium is skewed by the conveyance resistance after performing vertical registration correction and skew correction without increasing the size of the apparatus. It is an object of the present invention to provide a transport device and an image forming apparatus in which lateral registration correction is performed with high accuracy without the occurrence of such problems.

According to a first aspect of the present invention, a conveying apparatus according to the first aspect of the present invention is a conveying apparatus that conveys a recording medium in a conveying path, and is formed so as to be movable in the width direction while sandwiching the recording medium, and rotates. The first clamping roller formed so as to be able to convey the recording medium, and the upstream side of the conveying path with respect to the first clamping roller, and is formed so as to be movable in the width direction while sandwiching the recording medium. And a second nipping roller formed so as to be able to convey the recording medium by rotating, and a detecting means for detecting a positional deviation amount of the recording medium conveyed in the conveying path in the width direction. The clamping roller, together with the first clamping roller, can be switched between a closed state and an opened state of the transport path at a position upstream of the transport path from the nip position. As well as comprising a rolling possible-formed engaging portion, it is formed so as to be spaced to be switched between a state in which no state and clamped which sandwiches recording medium,
The first clamping roller rotates so that the locking portion closes the transport path, and the leading end of the recording medium transported in the transport path abuts the locking portion, thereby transporting the recording medium An operation of correcting the positional deviation in the width direction of the recording medium, and then correcting the positional deviation in the width direction of the recording medium. When a recording medium that is longer than the distance of the transport path from the second sandwiching roller to the first sandwiching roller is transported, the first sandwiching roller and the second sandwiching roller are based on the detection result of the detection unit. An operation of correcting the positional deviation in the width direction of the recording medium by moving the first clamping roller and the second clamping roller in the width direction in a state where the recording medium is sandwiched by the clamping roller, From the second clamping roller When a recording medium shorter than the distance of the conveyance path to the first sandwiching roller is transported, the second sandwiching roller does not sandwich the recording medium based on the detection result of the detecting means. In this state, the first clamping roller is moved in the width direction while the recording medium is sandwiched by one clamping roller, and the positional deviation in the width direction of the recording medium is corrected.

  According to the present invention, a second sandwiching roller is installed on the upstream side of the first sandwiching roller on which a locking portion for performing vertical registration correction and skew feeding correction is formed, and according to the length of the recording medium being conveyed. Then, the first clamping roller and the second clamping roller are moved in the width direction in a state in which the recording medium is clamped between the first clamping roller and the second clamping roller based on the positional deviation amount of the lateral registration detected by the detection means. The width of the first clamping roller is not changed by the lateral registration correction or the recording medium is clamped by the first clamping roller without being clamped by the second clamping roller based on the positional deviation amount of the lateral registration detected by the detecting means. The lateral registration correction is performed by moving in the direction. Thereby, without increasing the size of the apparatus, the lateral registration correction is performed with high accuracy without causing a problem that the recording medium skews due to the conveyance resistance after performing the vertical registration correction and the skew correction. A conveyance device and an image forming apparatus can be provided.

1 is an overall configuration diagram illustrating an image forming apparatus according to an embodiment of the present invention. It is a block diagram which shows a conveying apparatus. It is a top view which shows a part of conveying apparatus. FIG. 10 is a schematic diagram illustrating an operation of the transport device when a recording medium having a long length in the transport direction is transported. FIG. 6 is a schematic diagram illustrating an operation of the transport device when a recording medium having a short length in the transport direction is transported.

  Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings. In addition, in each figure, the same code | symbol is attached | subjected to the part which is the same or it corresponds, The duplication description is simplified or abbreviate | omitted suitably.

First, the configuration and operation of the entire image forming apparatus will be described with reference to FIG.
In FIG. 1, reference numeral 1 denotes an apparatus main body of a copying machine as an image forming apparatus, 2 an original reading unit that optically reads image information of an original D, and 3 an exposure light L based on image information read by the original reading unit 2. Is exposed to the photosensitive drum 5, 4 is an image forming unit for forming a toner image (image) on the photosensitive drum 5, and 7 is a toner image formed on the photosensitive drum 5 on the recording medium P. A transfer section (image forming section) for transferring, 10 a document transport section for transporting a set document D to the document reading section 2, and 12 to 14 a paper feed section for storing a recording medium P (sheet) such as transfer paper. (Paper feed cassette), 20 is a fixing device for fixing an unfixed image on the recording medium P, 21 is a fixing roller installed in the fixing device 20, 22 is a pressure roller installed in the fixing device 20, and 30 is recording. A transport device 45 for transporting the medium P along the transport path, The first conveying roller pair for conveying the recording medium P toward the parts 7 (registration roller) shows.

With reference to FIG. 1, an operation during normal image formation in the image forming apparatus will be described.
First, the document D is conveyed from the document table in the direction of the arrow in the drawing by the conveyance roller of the document conveyance unit 10 and passes over the document reading unit 2. At this time, the document reading unit 2 optically reads the image information of the document D passing above.
Then, the optical image information read by the document reading unit 2 is converted into an electric signal and then transmitted to the exposure unit 3 (writing unit). An exposure light L (laser light) based on the image information of the electrical signal is emitted from the exposure unit 3 toward the photosensitive drum 5 of the image forming unit 4.

On the other hand, in the image forming unit 4, the photosensitive drum 5 is rotated in the clockwise direction in the drawing, and image information is transferred onto the photosensitive drum 5 through a predetermined image forming process (charging process, exposure process, development process). An image (toner image) corresponding to is formed.
Thereafter, the image formed on the photosensitive drum 5 is transferred onto the recording medium P conveyed by the first conveying roller pair 45 (registration roller) in the transfer unit 7 as an image forming unit.

On the other hand, referring to FIGS. 1 and 2, the recording medium P conveyed to the transfer unit 7 (image forming unit) operates as follows.
First, one of the plurality of paper feeding units 12 to 14 of the image forming apparatus main body 1 is automatically or manually selected (for example, the paper feeding unit 12 provided in the main body 1 is selected. )
Then, the uppermost sheet of the recording medium P stored in the paper feeding unit 12 is fed by the paper feeding roller 41 toward the curved conveyance path K1 where the first alignment assisting part 52A is installed.

  Thereafter, the recording medium P is a position of the merging portion X from the curved conveyance path K1 (the portion where the conveyance paths K3 and K4 from the two sheet feeding units 13 and 14 installed outside the apparatus main body 1 merge). After passing through, the linear transport path K2 in which the aligning portion 51 is installed is reached and the position of the first transport roller pair 45 (registration roller) is reached. The recording medium P that has reached the position of the first conveying roller pair 45 is directed to the transfer unit 7 (image forming unit) at the same timing in order to align with the image formed on the photosensitive drum 5. Are transported.

After the transfer process, the recording medium P passes through the position of the transfer unit 7 and then reaches the fixing device 20 through the conveyance path. The recording medium P that has reached the fixing device 20 is fed between the fixing roller 21 and the pressure roller 22, and the image is fixed by the heat received from the fixing roller 21 and the pressure received from both members 21 and 22. The The recording medium P on which the image has been fixed is delivered from between the fixing roller 21 and the pressure roller 22 (a nip portion) and then discharged from the image forming apparatus main body 1.
Thus, a series of image forming processes is completed.

Here, with reference to FIG. 2, the image forming apparatus 1 according to the present embodiment can feed the recording medium P from the three paper feeding units 12 to 14 toward the transfer unit 7 (image forming unit). It is configured.
Specifically, the first paper feed unit 12 is installed at a position below the apparatus main body 1. A curved conveyance path K1 (curve conveyance path) formed in a curved shape along the conveyance direction of the recording medium P is provided as a conveyance path from the first paper feeding unit 12 to the junction X. The curved conveyance path K1 is formed by a curved conveyance guide plate (not shown) (installed so as to sandwich the front and back surfaces of the recording medium P to be conveyed), and a third conveyance roller pair along the conveyance direction. 42 and a second clamping roller 32 (lateral registration correction auxiliary roller) are provided. Each of the third conveying roller pair 42 and the second sandwiching roller 32 is driven and rotated by a frictional resistance between a driving roller (rotated by a driving mechanism (not shown)) and a driven roller. And the recording medium P is conveyed while being sandwiched between two rollers. The second clamping roller 32 installed in the curved conveyance path K1 also functions as an alignment assisting part 52A (first alignment assisting part) for assisting the lateral registration correction operation. This will be explained in detail.
In the present embodiment, the curved conveyance path K1 is formed so that its radius of curvature is 50 mm or less. Therefore, the distance between the first paper feeding unit 12 and the merging unit X (or the aligning unit 51) is narrowed, and the image forming apparatus 1 (conveying device 30) is entirely downsized (compacted). .

Further, both of the second paper feed unit 13 and the third paper feed unit 14 are provided outside at positions on the side of the apparatus main body 1. A curved conveyance path K3 and a straight conveyance path are formed in the conveyance path from the second paper feeding unit 13 to the junction X, and the fourth conveyance roller pair 32 and the second clamping roller 43 are installed. . A straight conveyance path K4 is formed in the conveyance path from the third paper feeding unit 14 to the junction X, and a fifth conveyance roller pair 44 and a second clamping roller 43 are installed. The curved conveyance path K3 and the linear conveyance path K4 are respectively formed by a curved conveyance guide plate and a linear guide plate (both not shown). Each of the conveyance roller pairs 32 and 44 and the second nipping roller 43 is a roller pair composed of a driving roller and a driven roller, and conveys the recording medium P while being nipped by two rollers. . The second nipping roller 43 is upstream of the junction X common to the conveyance path from the second sheet feeder 13 to the junction X and the conveyance path from the third sheet feeder 14 to the junction X. It is installed at a position near the curved conveyance path K3 and functions as an alignment assisting part 52B (second alignment assisting part) for assisting the lateral registration correction operation. Become. The fourth transport roller pair 32 is installed in the curved transport path K3.
In the present embodiment, the curved conveyance path K3 is formed so that its radius of curvature is 50 mm or less. Therefore, the distance between the second paper feeding unit 13 and the merging unit X (or the aligning unit 51) is narrowed, and the image forming apparatus 1 (conveying device 30) is downsized (compacted) as a whole. .
In the present embodiment, the curved conveyance path K3 and the straight conveyance path K4 are configured to be installed in the apparatus main body 1. However, the curved conveyance path K3, the straight conveyance path K4, and the two paper feeding units 13 and 14 are provided. Can be integrally configured as a paper feed unit (paper feed device) that can be attached to and detached from the apparatus main body 1. In that case, the apparatus main body 1 itself is further reduced in size.

  Further, the first conveyance roller pair 45 (registration roller pair) is formed from a junction X where the conveyance path from the first sheet feeding unit 12 and the conveyance path from the second and third sheet feeding units 13 and 14 merge. ), A linear conveyance path K2 formed in a substantially linear shape along the conveyance direction of the recording medium P is provided. The linear transport path K2 is formed by a linear transport guide plate (not shown) (installed so as to sandwich the front and back surfaces of the recording medium P to be transported), and a second transport roller pair along the transport direction. 33 (feed roller), first nipping roller 31 (horizontal registration / vertical registration / skew correction roller), CIS 36 (detection means), and first conveyance roller pair 45 are installed. Each of the second transport roller pair 33, the first sandwiching roller 31, and the first transport roller pair 45 is a roller pair composed of a driving roller and a driven roller, and the recording medium P is sandwiched between the two rollers. Will be transported. The members such as the second conveyance roller pair 33, the first clamping roller 31, and the CIS 36 installed in the linear conveyance path K2 are alignment units for performing alignment operations such as vertical registration correction, skew feeding correction, and horizontal registration correction. This also functions as 51, which will be described in detail later.

Next, with reference to FIGS. 2 to 5, the conveyance device 30 that is characteristic in the present embodiment will be described in detail.
Hereinafter, the configuration in the transport path from the first paper feed unit 12 to the first transport roller pair 45 and the operations performed there will be described.
2 and 3, the conveyance device 30 includes a third conveyance roller pair in the curved conveyance path K1 along the conveyance path of the recording medium P (the path indicated by the thick solid line in FIG. 2). 42, a second nipping roller 32 (horizontal registration correction auxiliary roller) is installed, and a second conveyance roller pair 33, a first nipping roller 31 (horizontal registration / vertical registration / skew correction roller) and detection are provided on the linear conveyance path K2. As a means, a CIS 36 (contact image sensor) and a first conveying roller pair 45 (registration roller) are installed.

  Here, the first clamping roller 31 is a roller pair having a plurality of roller portions divided in the width direction, a driven roller 31a, a driving roller 31b provided with a locking portion 31b1 (abutting member), and It consists of The first clamping roller 31 is configured so as to be able to abut and disengage the roller pair by a drive mechanism (not shown) and to move in the width direction (in the direction of the broken line arrow S in FIG. 3). It is configured. That is, the first clamping roller 31 is formed to be separable so as to be able to switch between a state in which the recording medium P is sandwiched and a state in which the recording medium P is not sandwiched, and is formed to be able to transport the recording medium P by rotating.

  Further, the first clamping roller 31 (drive roller 31b) can be switched between a closed state and an opened state at a position upstream of the nip position (on the upstream side of the transport path). A locking portion 31b1 (formed of a resin material or a metal material) is formed so as to be rotatable together with the first clamping roller 31 (drive roller 31b). Specifically, the locking portion 31b1 is formed so as to protrude from a part of the outer peripheral surface of the roller portion (a roller portion formed at both ends in the width direction) of the drive roller 31b. When the locking portion 31b1 rotates and closes the transport path (the state shown in FIG. 4A), the leading end of the recording medium P is brought into contact with the locking portion 31b1 to make the recording medium P vertically. Registration correction and skew correction are performed. That is, the first clamping roller 31 functions as a means for performing vertical registration correction and skew correction of the recording medium P. The drive roller 31b is connected to a drive motor (not shown), and an encoder for detecting the orientation of the drive roller 31b in the rotational direction (position of the locking portion 31b1) is installed on the rotation shaft portion. Yes.

  Then, the recording medium P that has been subjected to the vertical registration correction and the skew feeding correction by abutting the recording medium P against the engaging portion 31b1 of the first clamping roller 31 is rotated in the conveyance direction by the subsequent rotation of the first clamping roller 31. The lateral registration of the recording medium P is corrected by moving in the width direction with the recording medium P sandwiched and conveyed. That is, the first clamping roller 31 is formed so as to be movable in the width direction in a state where the recording medium P is sandwiched, and the recording medium P conveyed in the conveyance path is displaced in the width direction so that the width direction of the recording medium P is reached. It also functions as a lateral registration correction means for correcting the positional deviation.

  As described above, in the present embodiment, the first nipping roller 31 that functions as the lateral registration correction means is provided with the locking portion 31b1 so that it also functions as the vertical registration / skew correction means. The length of the transport path can be set shorter than in the case where the vertical registration / skew correction unit is separately provided on the downstream side of the unit.

  Here, the second conveyance roller pair 33 (feed roller) is located upstream of the first clamping roller 31 (upstream in the conveyance direction), and is located between the second clamping roller 32 and the first clamping roller 31. It is installed at the position between. The second conveying roller pair 33 is formed so as to be able to convey the recording medium P by rotating in a state in which the recording medium P is sandwiched, and is separated so as to be able to switch between a state in which the recording medium P is sandwiched and a state in which the recording medium P is not sandwiched. It is a pair of conveyance rollers formed so as to be possible. The second conveying roller pair 33 is engaged with the second conveying roller pair 33 when the recording medium P is nipped / conveyed and the leading end of the recording medium P abuts against the engaging portion 31b1 of the first nipping roller 31. The recording medium P is slightly bent (the buffer portion is a portion surrounded by a broken line in FIGS. 4A and 5A) between the portion 31b1 and the conveyance thereof. Time (driving time) is controlled.

  The first conveyance roller pair 45 (registration roller) is a conveyance roller pair disposed on the downstream side of the conveyance path (downstream in the conveyance direction) with respect to the first sandwiching roller 31 and sandwiches the recording medium P. It is formed so that the recording medium can be conveyed. Then, the recording medium P after the lateral registration is corrected by the first sandwiching roller 31 is transported to the position of the first transport roller pair 45, and the state of being sandwiched by the first transport roller pair 45 is a photo sensor (not shown). In the figure, when detected by the first conveying roller pair 45 and the image forming unit), the conveyance is temporarily stopped. Thereafter, the rotation timing of the first conveying roller pair 45 is started so as to match the image formed on the photosensitive drum 5, whereby the conveyance timing of the recording medium P conveyed toward the image forming unit is adjusted. Is done.

Here, in the present embodiment, the locking portion 31b1 installed on the first clamping roller 31 is a position where the conveying path is opened from the position where the first clamping roller 31 (drive roller 31b) rotates once. It moves so that it may move to the position which closes again. That is, the locking portion 31b is formed so as to protrude at one place in the circumferential direction on the outer peripheral surface of the drive roller 31b. Referring to FIG. 2, the distance of the conveyance path from the nip position of the first clamping roller 31 (the position where the driving roller 31 b and the driven roller 31 a are in pressure contact) to the nip position of the first conveyance roller pair 45. H is formed so as to be shorter than the distance that the first clamping roller 31 (drive roller 31b) makes one rotation and transports the recording medium P. That is, the distance H of the conveyance path from the nip position of the first clamping roller 31 to the nip position of the first conveyance roller pair 45 is from the position where the locking portion 31b1 closes the conveyance path as the first clamping roller 31 rotates. It is formed so as to be shorter than the distance in the rotational direction of moving to the opening position and moving to the closing position again. Specifically, when the outer diameter of the drive roller 31b is D, the relationship H <πD is established. 2 to 5, the distance H is illustrated with a longer distance for easy viewing.
With such a configuration, after the leading end of the recording medium P is brought into contact with the engaging portion 31b1 and the vertical registration / skew correction is performed, the first conveyance roller 31 is rotated and the first conveyance is performed while sandwiching the recording medium P. When transported toward the nip position of the roller pair 45, it is possible to prevent the locking portion 31b1 from interfering with the abdomen of the recording medium P in the clamped state.

The CIS 36 as a detection unit is installed on the downstream side of the conveyance path with respect to the first sandwiching roller 31 and on the upstream side of the conveyance path with respect to the first conveyance roller pair 45. The CIS 36 includes a plurality of photosensors (consisting of a light emitting element such as an LED and a light receiving element such as a photodiode) arranged in the width direction, and is a side end portion on one end side in the width direction of the recording medium P. By detecting the position of Pa (edge portion), the shift amount of the lateral resist is detected. That is, the CIS 36 (detection means) detects the amount of positional deviation in the width direction of the recording medium P that is transported in the transport path of the transport device 30. Based on the detection result of the CIS 36, lateral registration correction by the first clamping roller 31 (or lateral registration correction by the first clamping roller 31 and the second clamping roller 32) is performed.
In this embodiment, as shown in FIG. 3, the CIS 36 is installed only at one end in the width direction and the position of the side end Pa on the one end side in the width direction of the recording medium P is detected. It is also possible to detect the positions of the respective side end portions at both ends in the width direction of the recording medium P by installing over the entire area.

On the other hand, in the middle of the curved conveyance path K1 (curve), the second clamping roller 32 (first alignment assisting part 52A) and the third conveyance roller pair 42 are installed.
The second sandwiching roller 32 is installed at a position sufficiently upstream of the first sandwiching roller 31 on the upstream side of the transport path. The second sandwiching roller 32 is configured to be able to abut and disengage the roller pair by a drive mechanism (not shown) and to be movable in the width direction (the direction perpendicular to the paper surface of FIG. 2). Has been. That is, like the first clamping roller 31, the second clamping roller 32 is formed so as to be separable so as to be able to switch between a state in which the recording medium P is sandwiched and a state in which the recording medium P is not sandwiched, and by rotating, the recording medium P It is formed to be transportable. When the predetermined condition is satisfied, the second sandwiching roller 32 moves in the width direction while sandwiching the recording medium P together with the first sandwiching roller 31 to correct the lateral registration of the recording medium P. That is, the second sandwiching roller 32 is formed to be movable in the width direction while sandwiching the recording medium P, and displaces the recording medium P transported in the transport path in the width direction under a predetermined condition. Thus, it functions as a lateral registration correction assisting means for correcting the positional deviation of the recording medium P in the width direction.
Further, the third transport roller pair 42 is installed at a position upstream of the second sandwiching roller, and is formed to be separable so as to switch between a state in which the recording medium P is sandwiched and a state in which the recording medium P is not sandwiched. Yes.
In addition, in the conveyance device 30, a part of the plurality of roller pairs 31 to 33 and 42 to 45 can be independently rotated (a variety of rotation driving described later with reference to FIGS. 4 and 5). In order to do this, a plurality of drive motors (drive mechanisms) are installed.

In the transport device 30 configured as described above, the first sandwiching roller in a state where the recording medium P is sandwiched between the first sandwiching roller 31 and the second sandwiching roller 32 based on the detection result of the CIS 36 (detection means). 31 and the second sandwiching roller 32 are moved in the width direction (or the first sandwiching roller 31 is moved in the width direction in a state where the recording medium P is sandwiched only by the first sandwiching roller 31), in the transport path. The positional deviation (lateral registration) in the width direction of the recording medium P being conveyed is corrected.
As a specific example, referring to FIG. 3, the recording medium P is displaced by a distance α in the right direction in the drawing with respect to the reference position indicated by the alternate long and short dash line (a normal position having no positional deviation). When the state is detected by the CIS 36, the control unit sets the positional deviation amount α as a correction amount, and the first sandwiching roller 31 and the first sandwiching roller 31 while the recording medium P is sandwiched between the first sandwiching roller 31 and the second sandwiching roller 32. The second sandwiching roller 32 is moved in the left direction in the figure by a distance α (or the first sandwiching roller 31 is moved in the left direction in the figure while the recording medium P is sandwiched by only the first sandwiching roller 31. will be moved by α).

As described above, the lateral registration correction is performed by sandwiching the recording medium P between the first sandwiching roller 31 and the second sandwiching roller 32 in the conveyance path from the second sandwiching roller 32 to the first sandwiching roller 31. This is when a recording medium P longer than the distance (for example, a long paper having a size in the transport direction of 900 mm or more) is transported.
That is, in the present embodiment, a recording medium P that is shorter than the distance of the transport path from the second sandwiching roller 32 to the first sandwiching roller 31 (for example, a sheet with a transport direction size of A4 short size). When transported, the first sandwiching roller 31 is moved in the width direction while the recording medium P is sandwiched only by the first sandwiching roller 31 based on the detection result of the CIS 36 (detection means), and transported in the transport path. The positional deviation of the recording medium P in the width direction is corrected.

  With such a configuration and operation, in the downsized image forming apparatus 1 (conveying device 30) in which the curved conveying path K1 having a radius of curvature of 50 mm or less is provided, the rear end thereof is positioned in the curved conveying path K1. Even when the lateral registration correction is performed on the recording medium P in the state, the position near the front end of the recording medium P is sandwiched by the first clamping roller 31 and the position near the rear end of the recording medium P (or Since the recording medium P is moved in the width direction in a state where the second holding roller 32 holds the position sufficiently away from the tip, the recording medium P is slidably contacted with the curved conveyance path K1 during the movement in the width direction. The resistance (conveyance resistance) generated by this can be reduced. For this reason, the recording medium is hardly skewed or twisted or wrinkled by the conveyance resistance, and the lateral registration correction is performed with high accuracy. Note that the force (clamping force) for sandwiching the recording medium P by the two sandwiching rollers 31 and 32 is set to be sufficiently large with respect to the conveyance resistance generated when the recording medium P slides on the curved conveyance path K1. ing.

When the recording medium P that is shorter than the distance of the transport path from the second sandwiching roller 32 to the first sandwiching roller 31 is transported, the recording medium P is generated on the recording medium P without interfering with the curved transport path K1. Since the lateral registration correction is performed in the linear transport path K2 having a small transport resistance, the lateral registration correction is performed with high accuracy without causing skew, twisting and wrinkling.
Note that the lateral registration correction control that is switched according to the size of the recording medium P in the conveyance direction described above is performed based on information about the size of the recording medium P input to the control unit. It may be based on information detected by a size detection sensor that directly detects the size of the recording medium P in the transport path from the paper unit 12 or the paper supply unit 12 to the alignment unit 51, or may be operated by the user on the operation panel. It may be based on the information of the recording medium P input from (not shown).

In the present embodiment, a recording medium P that is longer than the distance of the transport path from the second sandwiching roller 32 to the first sandwiching roller 31 (for example, a long sheet having a transport direction size of 900 mm or more). Even when transported, the first sandwiching roller 31 and the second sandwiching roller 32 depend on the detection result of the CIS 36 (detection means) according to the thickness (paper thickness) of the transported recording medium P. An operation of correcting the positional deviation in the width direction of the recording medium P by moving the first clamping roller 31 and the second clamping roller 32 in the width direction in a state where the recording medium P is sandwiched, and a detection result of the CIS 36. The first clamping roller 31 is moved in the width direction in a state where the second clamping roller 32 is separated while the recording medium P is clamped by the first clamping roller 31 (the recording medium P is clamped only by the first clamping roller 31). The width of the recording medium P Operation for correcting the positional deviation of the direction, can also be controlled to be switched.
Specifically, when the thickness of the conveyed recording medium P exceeds a predetermined value (for example, when the recording medium P having a basis weight of 64 g / m 2 is passed), the detection result of the CIS 36 is included. Accordingly, the first clamping roller 31 and the second clamping roller 32 are moved in the width direction in a state in which the recording medium P is sandwiched between the first clamping roller 31 and the second clamping roller 32, and the position in the width direction of the recording medium P is thus determined. An operation to correct the deviation is performed. On the other hand, when the thickness of the transported recording medium P is equal to or less than a predetermined value (for example, a thin paper (recording medium P) having a basis weight of 64 g / m 2 or less is passed). In the state where the second clamping roller 32 is separated while the recording medium P is clamped by the first clamping roller 31 based on the detection result of the CIS 36 (the recording medium P is clamped only by the first clamping roller 31). An operation of correcting the positional deviation in the width direction of the recording medium P by moving the clamping roller 31 in the width direction is performed (at this time, the second clamping roller 32 is in a separated state).

  As described above, when the recording medium P to be transported is thin paper, the lateral registration correction is performed using only the first clamping roller 31 without performing the lateral registration correction using the two clamping rollers 31 and 32. Therefore, when the lateral registration correction is performed by sandwiching the leading and trailing ends of the recording medium P (thin paper) having a small thickness and weak stiffness with the two clamping rollers 31 and 32, the recording medium P is twisted. The problem that wrinkles and lines are likely to occur can be reduced. Further, since the recording medium P (thin paper) having a small thickness and weak stiffness originally has a small resistance (conveyance resistance) caused by sliding contact with the curved conveyance path K1, the lateral registration correction using only the first clamping roller 31 is performed. Even if it performs, horizontal registration correction | amendment will be performed with high precision, with almost no malfunctions, such as skew feeding.

Note that the lateral registration correction control switched according to the thickness (paper thickness) of the recording medium P described above is performed based on the information regarding the thickness of the recording medium P input to the control unit. May be based on information detected by a thickness detection sensor that directly detects the thickness of the recording medium P in the conveyance path from the paper supply unit 12 or the paper supply unit 12 to the alignment unit 51. The information may be based on information on the recording medium P input from the operation panel (not shown) by the user.
Further, when the recording medium P is transported shorter than the distance of the transport path from the second sandwiching roller 32 to the first sandwiching roller 31, the first sandwiching roller as described above regardless of the thickness of the recording medium P. Lateral registration correction using only 31 is performed.

Although the case where the recording medium P is fed from the first paper feeding unit 12 has been described so far, the recording medium P is fed from the second paper feeding unit 13 or the third paper feeding unit 14. Similarly, when the recording medium P having a long size in the transport direction is transported, the lateral registration correction is performed by sandwiching the recording medium P between the first sandwiching roller 31 and the second sandwiching roller 43. become.
In particular, when the recording medium P is fed from the second paper feeding unit 13, the recording medium P is transported through the curved transport path K3 having a radius of curvature of 50 mm or less. The effect of will be demonstrated.
Note that, when the recording medium P is fed from the third paper feeding unit 14, the recording medium P is transported through the linear transport path K4, so that the transport resistance generated in the recording medium P is increased in the first place. In addition, since skew, twist, and wrinkle hardly occur, the lateral registration correction can be performed by sandwiching the recording medium P only by the first sandwiching roller 31.

  In the image forming apparatus 1 according to the present embodiment, the size in the transport direction of all the recording media P that can be passed is longer than the distance of the transport path from the second sandwiching roller 32 to the first sandwiching roller 31. In such a configuration, regardless of the size of the recording medium P, a lateral registration correction operation is performed in which the recording medium P is sandwiched between the first clamping roller 31 and the second clamping roller 32. Become.

Here, in the present embodiment, as described above, when the lateral registration correction is performed by sandwiching the recording medium P by the first sandwiching roller 31 and the second sandwiching roller 32 (or only by the first sandwiching roller 31). When the recording medium P is sandwiched and the lateral registration correction is performed, the other conveying roller pairs (the second conveying roller pair 33 and the third conveying roller pair 42) facing the recording medium P and moved in the width direction Is a pair of conveying rollers that are not configured to be capable of being separated from each other).
This ensures that the above-described lateral registration correction is performed.

In the present embodiment, before the lateral registration correction is performed by sandwiching the recording medium P by the first sandwiching roller 31 and the second sandwiching roller 32 (or the recording medium P is sandwiched by only the first sandwiching roller 31). Before the lateral registration is corrected), the first clamping roller 31 is rotated so that the locking portion 31b1 closes the conveying path at a position upstream of the nip position of the first clamping roller 31. By abutting the leading end of the recording medium P against the portion 31b1, the vertical registration correction (correction for positional deviation in the transport direction) and skew correction (correction for positional deviation oblique to the transport direction) are performed. Yes.)
Accordingly, the vertical registration correction and the skew feeding correction are surely performed before the horizontal registration correction without disturbing the first clamping roller 31.

Further, in the present embodiment, in the state where the first sandwiching roller 31 and the second sandwiching roller 32 are rotated so as to be able to transport the recording medium P, the positional deviation amount in the width direction of the recording medium P is detected by the CIS 36 (detection means). Then, the lateral registration correction of the recording medium P is performed based on the detection result.
That is, when the lateral registration correction is performed by sandwiching the recording medium P between the first sandwiching roller 31 and the second sandwiching roller 32, the first sandwiching roller 31 and the second sandwiching roller 32 are driven to rotate, respectively. Perform while carrying P. Further, when the lateral registration correction is performed by sandwiching the recording medium P only by the first sandwiching roller 31, the first sandwiching roller 31 is rotationally driven to transport the recording medium P.
Accordingly, the lateral registration correction of the recording medium P can be performed without reducing the productivity of the apparatus as compared with the case where the lateral registration correction is performed by stopping the rotational driving of the first clamping roller 31 and the second clamping roller 32. it can.

In the present embodiment, after the lateral registration correction described above is performed, when the recording medium P subjected to the lateral registration correction is sandwiched between the first conveying roller pair 45 (registration rollers), the first sandwiching is performed. The rollers 31 are separated so as not to sandwich the recording medium P.
Thereby, the transport process toward the image forming unit by the first transport roller pair 45 is surely performed, and the operation of the alignment unit 51 for the transported recording medium P is quickly prepared. Become.

Hereinafter, an example of the operation of the transport device 30 configured as described above will be described in detail with reference to FIGS.
The operation of the transport device 30 described below is when the recording medium P is transported longer than the distance of the transport path from the second sandwiching roller 32 to the first sandwiching roller 31.
First, the recording medium P fed from the paper feeding unit 12 is sandwiched and transported by a plurality of roller pairs 42, 32, and 33, and the leading end of the recording medium P passes through the curved transport path K1 in the first linear transport path K2. It reaches the position of the clamping roller 31 (conveyance in the direction of the broken line arrow) At this time, the first clamping roller 31 is set in a rotational direction so that the locking portion 31b1 moves to a position where the conveying path is closed (the state shown in FIG. 4A). .)
Then, as shown in FIG. 4A, the recording medium P stops when its leading end abuts against the locking portion 31b1. At this time, due to overrun of the second conveyance roller pair 33, a predetermined deflection (a buffer portion, surrounded by a broken line in FIG. 4A) between the second conveyance roller pair 33 and the locking portion 31b1. Part.) Is formed.
Thus, the vertical registration of the recording medium P is corrected. That is, after that, in the state where the positional deviation in the transport direction is corrected, the first nipping roller 31 is rotationally driven, and the recording medium P is transported toward the first transport roller pair 45.
Further, the skew of the recording medium P is also corrected by the leading end of the recording medium P abutting against the locking portion 31b1. That is, even if the recording medium P is conveyed in an oblique posture with respect to the conveyance direction (even if skewed), one end of the leading end first hits the locking portion 31b1 and eventually the other end also becomes the center. It will abut against the locking portion 31b1, and finally the skew of the recording medium P is corrected.

Thereafter, as shown in FIG. 4B, the recording medium P in a state where the leading end is in contact with the locking portion 31b1 remains in the state where the vertical registration correction and the skew correction are performed, It is nipped and conveyed by the second nipping roller 32. At this time, the locking portion 31b1 moves in a direction to open the conveyance path by the rotation of the first clamping roller 31 (drive roller 31b) in the arrow direction. Further, the second conveyance roller pair 33 and the third conveyance roller pair 42 are moved away from each other in the direction in which the conveyance path is opened and the recording medium P is not sandwiched (in the direction of the solid arrow). Then, the first sandwiching roller 31 and the second sandwiching roller 32 start rotating in the direction of the arrow while sandwiching the recording medium P.
Then, the recording medium P is nipped and conveyed by the first nipping roller 31 and the second nipping roller 32, and the leading end of the recording medium P reaches the position of the CIS 36, and the position shift amount α of the lateral resist is detected at that position. Thus, based on the detection result, the first clamping roller 31 and the second clamping roller 32 move in the width direction (in the direction perpendicular to the paper surface (S direction)) in synchronization. That is, the displacement amount of the lateral registration of the recording medium P is detected by the CIS 36, and the two sandwiching rollers 31 and 32 move in the width direction synchronously so as to cancel the displacement amount (in the same direction and the same movement amount). Move.) In this way, the recording medium P is transported toward the first transport roller pair 45 while performing lateral registration correction.

Thereafter, as shown in FIG. 4C, the front end of the recording medium P with the corrected lateral registration is sandwiched between the first conveying roller pair 45 and temporarily stops. At this time, the first sandwiching roller 31 (or the first sandwiching roller 31 and another roller pair) that sandwiched and transported the recording medium P opens the transport path and does not sandwich the recording medium P. Move away in the direction (the direction of the solid arrow).
Thereafter, the timing of the image on the photosensitive drum 5 is synchronized with the rotation of the first conveying roller pair 45, and the recording medium P is conveyed toward the transfer unit 7 (image transfer unit). Thus, the image is transferred to a desired position on the recording medium P.

In the transport device 30 configured and operated in this way, the accuracy of the operation of moving the second clamping roller 32 in the width direction based on the detection result of the CIS 36 (detection means) is the first clamping roller based on the detection result of the CIS 36. It can be set to be lower than the accuracy of the movement of 31 in the width direction. That is, the accuracy of the lateral registration correction by the first clamping roller 31 can be configured to be higher than the accuracy of the lateral registration correction by the second clamping roller 32.
As described above, when the lateral registration correction of the recording medium P is performed while being sandwiched between the first sandwiching roller 31 and the second sandwiching roller 32, the accuracy of the lateral registration correction by the first sandwiching roller 31 is the overall accuracy. This is because the accuracy of the lateral registration correction by the second clamping roller 32 assists it and does not require a very high correction accuracy.
With this configuration, for example, a low-priced drive motor can be used as a drive motor installed in a moving mechanism in which the second clamping roller 32 moves in the width direction, and the overall cost of the apparatus can be reduced.

Hereinafter, another example of the operation of the transfer device 30 will be described in detail with reference to FIGS.
The operation of the transport device 30 described below is performed when the recording medium P shorter than the distance of the transport path from the second sandwiching roller 32 to the first sandwiching roller 31 is transported.
First, the recording medium P fed from the paper feeding unit 12 is sandwiched and transported by a plurality of roller pairs 42, 32, and 33, and the leading end of the recording medium P passes through the curved transport path K1 in the first linear transport path K2. It reaches the position of the clamping roller 31 (conveyance in the direction of the broken line arrow) At this time, the first clamping roller 31 is set in the rotation direction so that the locking portion 31b1 moves to a position where the conveying path is closed (the state shown in FIG. 5A). .)
Then, as shown in FIG. 5A, the recording medium P stops when its leading end abuts against the locking portion 31b1. At this time, due to the overrun of the second conveyance roller pair 33, a predetermined deflection (a buffer portion, surrounded by a broken line in FIG. 5A) is formed between the second conveyance roller pair 33 and the locking portion 31b1. Part.) Is formed.
Thus, the vertical registration of the recording medium P is corrected. That is, after that, in the state where the positional deviation in the transport direction is corrected, the first nipping roller 31 is rotationally driven, and the recording medium P is transported toward the first transport roller pair 45.
Further, the skew of the recording medium P is also corrected by the leading end of the recording medium P abutting against the locking portion 31b1. That is, even if the recording medium P is conveyed in an oblique posture with respect to the conveyance direction (even if skewed), one end of the leading end first hits the locking portion 31b1 and eventually the other end also becomes the center. It will abut against the locking portion 31b1, and finally the skew of the recording medium P is corrected.

Thereafter, as shown in FIG. 5B, the recording medium P in which the leading end is in contact with the engaging portion 31b1 is subjected to the first sandwiching roller 31 while being subjected to the vertical registration correction and the skew correction. Nipped and transported. At this time, the locking portion 31b1 moves in a direction to open the conveyance path by the rotation of the first clamping roller 31 (drive roller 31b) in the arrow direction. Of the second transport roller pair 33, the third transport roller pair 42, and the second sandwiching roller 32, at least the second transport roller pair 33 opens the transport path and does not sandwich the recording medium P (solid arrow). Direction). The first clamping roller 31 starts to rotate in the direction of the arrow while the recording medium P is being clamped.
Then, while the recording medium P is nipped and conveyed by the first nipping roller 31, the leading end thereof reaches the position of the CIS 36, and the position shift amount α of the lateral resist is detected at that position, and based on the detection result. Then, the first clamping roller 31 moves in the width direction (in the direction perpendicular to the paper surface (S direction)). That is, the displacement amount of the lateral registration of the recording medium P is detected by the CIS 36, and the first clamping roller 31 moves in the width direction so as to cancel the displacement amount. In this way, the recording medium P is transported toward the first transport roller pair 45 while performing lateral registration correction.

Thereafter, as shown in FIG. 5C, the front end of the recording medium P with the corrected lateral registration is sandwiched between the first conveying roller pair 45 and temporarily stops. At this time, the first sandwiching roller 31 (or the first sandwiching roller 31 and another roller pair) that sandwiched and transported the recording medium P opens the transport path and does not sandwich the recording medium P. Move away in the direction (the direction of the solid arrow).
Thereafter, the timing of the image on the photosensitive drum 5 is synchronized with the rotation of the first conveying roller pair 45, and the recording medium P is conveyed toward the transfer unit 7 (image transfer unit). Thus, the image is transferred to a desired position on the recording medium P.

  As described above, in the present embodiment, the second sandwiching roller 32 is installed on the upstream side of the first sandwiching roller 31 in which the locking portion 31b1 for performing vertical registration correction and skew feeding correction is formed. The recording medium P is sandwiched between the first sandwiching roller 31 and the second sandwiching roller 32 based on the amount of lateral misregistration detected by the CIS 36 (detection means) according to the length of the transported recording medium P. In this state, the lateral clamping correction is performed by moving the first clamping roller 31 and the second clamping roller 32 in the width direction, or the clamping by the second clamping roller 32 is performed based on the positional deviation amount of the lateral registration detected by the CIS 36. Without performing this, lateral registration correction is performed by moving the first sandwiching roller 31 in the width direction while the recording medium P is sandwiched by the first sandwiching roller 31. As a result, the lateral registration correction can be performed with high accuracy without causing the problem that the recording medium P skews due to the conveyance resistance after performing vertical registration correction and skew correction without increasing the size of the apparatus. Can do.

In the present embodiment, the present invention is applied to the conveyance device 30 installed in the monochrome image forming apparatus 1. However, the present invention is naturally applied to the conveyance device installed in the color image forming apparatus. Can be applied.
Further, in the present embodiment, the present invention is applied to the conveyance device 30 installed in the electrophotographic image forming apparatus 1, but the application of the present invention is not limited to this, and other methods can be used. Even a transport device installed in an image forming apparatus (for example, an ink jet image forming apparatus or an offset printing machine) may be any transport device that performs lateral registration correction. Of course, the present invention can be applied to the above.
Even in those cases, the same effects as in the present embodiment can be obtained.

Further, in the present embodiment, the present invention is applied to the transport device 30 disposed at a position upstream of the first transport roller pair 45 in the transport direction, but the application of the present invention is not limited to this. Of course, the present invention can be applied to all of the transfer devices as long as it is a transfer device that performs vertical registration, horizontal registration, and skew correction even if the transfer device is installed at other positions. Can be applied.
Moreover, in this Embodiment, although this invention was applied with respect to the conveying apparatus 30 where two conveyance paths merge in the junction part X, the conveyance apparatus in which three or more conveyance paths merge in the junction part X, and a merge Naturally, the present invention can also be applied to a transport apparatus that is formed of only one transport path without the portion X.
In the present embodiment, the present invention is applied to the conveyance device 30 in which the three paper feeding units 12 to 14 are installed. However, the conveyance device in which two or less or four or more paper feeding units are installed. Of course, the present invention can be applied to the above.
Even in those cases, the same effects as in the present embodiment can be obtained.

In this embodiment, eight roller pairs 31 to 33 and 42 to 45 are installed in the conveying device 30. However, a larger number of roller pairs can be installed, or fewer roller pairs can be installed. You can also In that case, at least two of the plurality of roller pairs become the first sandwiching roller 31 and the second sandwiching roller 32. Further, in accordance with the transport state of the recording medium P transported along the transport path, an operation different from the operation of the transport device 30 described with reference to FIGS. 4 and 5 (for example, the second sandwiching roller 32 is separated). , Various roller pairs can be contacted and separated at different timings, etc.).
Even in those cases, the same effects as in the present embodiment can be obtained.

  It should be noted that the present invention is not limited to the present embodiment, and it is obvious that the present embodiment can be modified as appropriate within the scope of the technical idea of the present invention, other than suggested in the present embodiment. is there. In addition, the number, position, shape, and the like of the constituent members are not limited to the present embodiment, and the number, position, shape, and the like suitable for implementing the present invention can be achieved.

  In the present application, the “width direction” is defined as a direction orthogonal to the conveyance direction of the recording medium.

1 image forming apparatus (apparatus body),
30 transport device,
31. First clamping roller (horizontal registration, vertical registration, skew feeding correction roller),
31a driven roller,
31b Driving roller,
31b1 locking part (abutting member),
33 Second conveying roller pair (conveying roller pair, feed roller),
36 CIS (detection means),
43 Second clamping roller (lateral registration correction auxiliary roller),
45 First conveying roller pair (conveying roller pair, registration roller),
51 alignment section,
52A 1st alignment assistance part, 52B 2nd alignment assistance part,
K1, K2 curved conveyance path, K3 linear conveyance path,
X junction, P recording medium (sheet).

JP 2008-50069 A JP 2012-30971 A

Claims (9)

  1. A transport device for transporting a recording medium in a transport path,
    A first clamping roller formed so as to be movable in the width direction in a state where the recording medium is sandwiched, and capable of conveying the recording medium by rotating;
    The first clamping roller is installed on the upstream side of the conveyance path, and is formed so as to be movable in the width direction while sandwiching the recording medium, and is formed so as to be able to convey the recording medium by rotating. Two clamping rollers;
    Detection means for detecting a positional deviation amount in the width direction of the recording medium conveyed in the conveyance path;
    With
    The first clamping roller is formed to be rotatable together with the first clamping roller so as to be able to switch between a closed state and an opened state of the transport path at a position upstream of the transport path from the nip position. It has a locking part and is formed so as to be separable so as to switch between a state in which the recording medium is sandwiched and a state in which the recording medium is not sandwiched,
    The first clamping roller rotates so that the locking portion closes the transport path, and the leading end of the recording medium transported in the transport path abuts the locking portion, thereby transporting the recording medium And / or the positional deviation in the oblique direction with respect to the transport direction, and then the positional deviation in the width direction of the recording medium is corrected,
    The operation of correcting the positional deviation in the width direction of the recording medium is as follows:
    When a recording medium longer than the distance of the conveyance path from the second sandwiching roller to the first sandwiching roller is transported, the first sandwiching roller and the second sandwiching roller are based on the detection result of the detection unit. An operation of correcting the positional deviation in the width direction of the recording medium by moving the first clamping roller and the second clamping roller in the width direction in a state where the recording medium is sandwiched by a roller,
    When a recording medium shorter than the distance of the conveyance path from the second clamping roller to the first clamping roller is conveyed, the recording medium is moved by the second clamping roller based on the detection result of the detection means. It is an operation of correcting the positional deviation in the width direction of the recording medium by moving the first clamping roller in the width direction in a state where the recording medium is clamped by the first clamping roller without being clamped. Conveying device to do.
  2. At least one position among the upstream position relative to the second sandwiching roller, the position between the second sandwiching roller and the first sandwiching roller, and the downstream position relative to the first sandwiching roller. A conveyance roller pair formed so as to be able to convey the recording medium by rotating in a state in which the recording medium is sandwiched, and to be separable so as to switch between a state in which the recording medium is sandwiched and a state in which the recording medium is not sandwiched. ,
    The transport apparatus according to claim 1, wherein when correcting a positional deviation in a width direction of the recording medium transported in the transport path, the transport roller pair is separated so as not to sandwich the recording medium. .
  3. The detection means is installed on the downstream side of the transport path with respect to the first clamping roller,
    In the state where the first sandwiching roller and the second sandwiching roller are rotated so as to be able to transport the recording medium, or in the state where the first sandwiching roller is rotated so as to be able to transport the recording medium, The transport apparatus according to claim 1 or 2, wherein a positional shift amount in the width direction is detected, and a positional shift in the width direction of the recording medium is corrected based on the detection result.
  4. A pair of conveyance rollers formed to be able to convey the recording medium by rotating in a state where the recording medium is nipped at a position downstream of the conveyance path with respect to the first clamping roller;
    After correcting the positional deviation in the width direction of the recording medium transported in the transport path, the first sandwiching roller does not sandwich the recording medium when the recording medium is sandwiched between the pair of transport rollers. The conveying apparatus according to claim 1, wherein the conveying apparatus is separated as described above.
  5. The locking portion is formed to move from a position to close the transport path to a position to open and move to a position to close again while the first clamping roller rotates once.
    The distance of the transport path from the nip position of the first sandwiching roller to the nip position of the pair of transport rollers is formed to be shorter than the distance that the first sandwiching roller rotates once and transports the recording medium. The conveying apparatus according to claim 4.
  6.   The accuracy of the movement of the second clamping roller in the width direction based on the detection result of the detection means is compared with the accuracy of the movement of the first clamping roller in the width direction based on the detection result of the detection means. The conveying device according to claim 1, wherein the conveying device is set to be low.
  7. The first clamping roller is installed in a linear conveyance path formed linearly along the conveyance direction,
    The transport apparatus according to claim 1, wherein the second sandwiching roller is installed in a curved transport path formed in a curved shape along the transport direction or in the vicinity thereof.
  8.   The transport apparatus according to claim 7, wherein the curved transport path is formed so that a curvature radius thereof is 50 mm or less.
  9.   An image forming apparatus comprising the transport device according to claim 1.
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