JP2009242073A - Carrying device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a carrying device suitable for a copier, capable of correcting a skew while preventing the occurrence of wrinkles. <P>SOLUTION: This carrying device is composed of a register roller 16 for receiving the distal edge of paper in an irrotational case, and a loop forming roller 16 for forming a loop B in the paper P by carrying the paper to the register roller in irrotational case. The loop forming roller 16 has a driving roller 25 rotatably pivoted by a support shaft 27, a pinch roller 26 oppositely arranged to this driving roller 25, and a one-way clutch 30 arranged on its support shaft 27 in a position adjacent to its driving roller 25, connected to its driving roller 25 via first joint mechanisms 30a and 32a for transmitting only rotation around the support shaft and transmitting rotation of its support shaft 27 to its driving roller 25 only when its support shaft 27 is rotated in one direction. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a transport device, and more particularly to a transport device that corrects skew (skew) in a paper transport process.

Conventionally, in apparatuses such as a printing apparatus, a copying machine, a facsimile machine, and a multifunction machine, a recording medium such as transfer paper supplied from a paper feeding unit (in the present invention, this recording medium is referred to as “paper”) is conveyed. If a so-called skew (skew) occurs in which the leading edge of the direction intersects with a direction other than perpendicular to the transport direction, an image cannot be formed at a normal position of the paper, so the skew (skew) is corrected in the paper transport process. A transport device is provided.
The conveying device for correcting the skew (skew) is configured by providing a pair of rollers, and the axial center direction of the pair of rollers is arranged so as to be orthogonal to the sheet conveying direction. A loop forming roller is disposed upstream of the position of the roller and the registration roller in the paper transport direction and at a distance slightly shorter than the length in the paper transport direction. Similar to the registration roller, the loop forming roller is configured by a pair of rollers, and is provided such that the axial direction of the pair of rollers is orthogonal to the sheet conveyance direction.

  In this transport device, when the paper is supplied from the loop forming roller to the non-rotating registration roller, the leading edge of the paper in the transport direction is abutted against the registration roller and the intermediate portion of the paper is positioned on one side of the paper. A kind of loop is formed by inflating to the side. By forming this loop, the entire leading edge of the sheet in the conveyance direction comes into contact with the registration roller, and the leading edge in the conveyance direction of the sheet is orthogonal to the conveyance direction. Thereafter, when the registration roller is driven to rotate, the registration roller is sent to a downstream device such as a photosensitive drum in a state where the leading edge in the conveyance direction of the sheet is orthogonal to the conveyance direction. Therefore, even when the paper supplied from the paper feeding unit is skewed (skew), when the paper is sent out from the registration rollers, the downstream apparatus is in a normal posture in which the skew (skew) is corrected. Is sent out.

  By the way, in the conventional conveying apparatus for correcting skew (skew), when the sheet enters the registration roller in a state where the skew (skew) on the rear side in the sheet conveying direction has not been eliminated (that is, formed). When entering the registration roller while the shape of the loop crest is high on one side and low on the other side, there is a risk that distortion will occur on the non-stretched side of the trailing edge area of the paper.

In order to prevent the occurrence of wrinkles as described above, in Patent Document 1, of a pair of rollers constituting a loop forming roller, a roller that is rotationally driven (hereinafter, this roller is referred to as a “driving roller”). A conveying device in which a one-way clutch is integrally provided is proposed.
In the transport apparatus according to this proposal, even if the transported paper is skewed (skew) and the height formed in the width direction of the loop formed on the paper is different, the registration roller rotates, As a result, when the loop on the lower side of the paper is first canceled and the paper on that side is pulled, the drive roller on that side is loosened so that the paper is pulled out without being stretched. Is quickly eliminated, and entry into the registration roller is prevented while causing distortion. Therefore, generation | occurrence | production of soot can be prevented beforehand.

However, since the conveying device according to the above proposal has a one-way clutch integrally provided on all the driving rollers of the loop forming roller, there is a disadvantage that the cost is high and there is a possibility that the timing of stopping the rotation of each driving roller is shifted. there were. Therefore, in order to eliminate these drawbacks, the present applicant has previously proposed a conveying device in which a one-way clutch is provided only on the driving roller of one loop forming roller as shown in Patent Document 2. Yes. The conveyance device according to this proposal has a feature that can correct skew (skew) at low cost while preventing occurrence of wrinkles.
JP-A-9-77310 JP 2006-290567 A

However, as described above, as shown in Patent Document 1 and Patent Document 2, when the one-way clutch is integrally incorporated in the driving roller of the loop forming roller, the one-way clutch is easily damaged, and therefore, one-way. There was a drawback that the life of the clutch was shortened.
This is because the driving roller of the loop forming roller needs to hold the sheet at a predetermined pressure, and thus the one-way clutch is constantly receiving pressure from the pinch roller that is the other roller facing the driving roller. This is because the shaft (shaft) that supports the drive roller is easily bent by the pressure and receives an external force due to the bending.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a transport device that does not damage the one-way clutch incorporated on the drive roller side of the loop forming roller.

  In order to achieve the above object, the transport device according to the present invention includes a registration roller that receives a leading edge piece of paper when not rotating, and a loop formation that transports the paper to the registration roller when not rotating and forms a loop on the paper. The loop forming roller includes a driving roller that is rotatably supported by a support shaft, a pinch roller provided opposite to the driving roller, and adjacent to the driving roller. Rotation of the support shaft only when the support shaft is connected to the drive roller through a first joint mechanism that transmits only rotation around the support shaft and is rotated in one direction. And a one-way clutch for transmitting to the drive roller.

  In the present invention, a plurality of the drive rollers are provided on the support shaft at a predetermined interval, and the plurality of drive rollers are provided via a second joint mechanism rotatably supported on the support shaft. The one-way clutch is provided at a position adjacent to any one of the plurality of drive rollers.

  In the present invention, the first joint mechanism is configured by a recess and a protrusion that can be fitted in the circumferential direction of the support shaft on the drive roller side and the one-way clutch side. Is adopted.

  According to the present invention, the one-way clutch incorporated on the drive roller side of the loop forming roller is provided on the support shaft at a position adjacent to the drive roller, and the first joint mechanism transmits only rotation around the support to the drive roller. Since the one-way clutch is not affected even if the driving roller receives pressure from the pinch roller, damage to the one-way clutch can be prevented and the life of the one-way clutch can be extended. .

  Hereinafter, an embodiment of a transport device according to the present invention will be described with reference to the drawings. In the following drawings, the scale of each member is appropriately changed in order to make each member a recognizable size.

  1 is a longitudinal sectional view showing a schematic configuration of a copying machine to which a conveying device according to an embodiment is applied, FIG. 2 is an enlarged view of a conveying device portion of the copying machine, and FIG. It is A sectional view. In these drawings, the scale of each member is appropriately changed to make each member a recognizable size.

  The copying machine 1 includes a document reading unit 2 and an image forming unit 3 in order to form a document image on the paper P based on the read document image data. In FIG. 1, arrows A1 and A2 indicate the conveyance direction of the paper P, respectively.

  The document reading unit 2 is configured to optically read the document and generate image data of the document. The image forming unit 3 reads the document image on the paper P based on the image data generated by the document reading unit 2. Is formed. The image forming unit 3 includes a paper storage unit 4, a paper transport path L 1, a transport device 5 according to the present invention, a photosensitive drum 6, a developing device 7, a transfer roller 8, a fixing device 9, a discharge device. A roller device 10 and a discharge tray 11 are included.

An image is formed on the paper P in the copying machine 1 as follows.
First, the paper P stored in the paper storage unit 4 is transported in the paper transport path L <b> 1 during image formation, and reaches the registration rollers 12 of the transport device 5. The paper P that has reached the registration roller 12 is transported downstream in the transport direction A1 at a predetermined timing, and reaches the transfer position T. This transfer position T corresponds to a contact portion (nip) between the photosensitive drum 6 and the transfer roller 8. An electrostatic latent image based on the image data generated by the document reading unit 2 is formed on the photosensitive drum 6, and the electrostatic latent image is developed with toner supplied from the developing device 7. Is formed.

  The paper P that has reached the transfer position T is sandwiched between the photosensitive drum 6 and the transfer roller 8, and the toner on the photosensitive drum 6 is transferred by the transfer bias of the transfer roller 8. Of the toner on the photosensitive drum 6, residual toner that has not been transferred to the paper P is removed from the photosensitive drum 6 by the cleaning device 13. The paper P that has passed the transfer position T is transported in the paper transport path L1 and reaches the fixing device 9.

The fixing device 9 includes a heat roller 14 and a pressure roller 15, and the paper P is configured to pass between contact portions (nips) between the heat roller 14 and the pressure roller 15. The paper P is heated and pressurized by passing the paper P through the nip, and the transferred toner is fixed to the paper P.
The paper P that has passed through the fixing device 9 is transported in the paper transport path L 1, reaches the discharge roller device 10, and is discharged to the discharge tray 11 by the discharge roller device 10.

The image forming unit 3 is further provided with a paper conveyance path L2, and duplex printing is possible. When this double-sided printing is performed, the paper P on which the image is formed on one side after passing through the fixing device 9 or the like is transported in a switchback by the discharge roller device 10. As a result, the paper P is sent to the paper transport path L2 and transported along the transport direction A2.
The paper P transported in the paper transport path L2 is returned to the paper transport path L1 again. The sheet P returned to the sheet conveyance path L1 is in a state in which the front surface and the back surface are reversed, and thus passes through the transfer position T and the like in the same manner as when the image is formed on the front surface. An image is formed on the back surface of the paper P and is discharged from the discharge roller device 10 to the discharge tray 11.

  As shown in detail in FIG. 2, the transport device 5 has a function of transporting the paper P transported in the paper transport path L <b> 1 from the paper storage unit 4 toward the transfer position T. And a loop forming roller 16 disposed on the upstream side of the registration roller 12 in the transport direction A1. The interval between the registration roller 12 and the loop forming roller 16 is determined to be shorter than the length of the paper P in the conveyance direction.

  The registration roller 12 receives the paper P when it is not rotating and conveys it toward the transfer position T at a predetermined timing. The registration roller 12 is a driving roller 17 and a driven roller (rotated and driven by the driving roller 17). Pinch roller) 18, and both rollers 17 and 18 are arranged to face each other. The drive roller 17 includes a drive shaft 19 and a roll body 20 that is externally fitted to the drive shaft 19 so as to be integrally rotatable.

The drive shaft 19 extends in the width direction of the paper P that transports the paper transport path L1 (“W” in FIG. 2 indicates this width direction, here the direction orthogonal to the paper surface), and image formation It is rotatably supported with respect to the housing 21 of the part 3. The drive shaft 19 is configured to be rotationally driven by a motor (not shown).
The driven roller 18 includes a support shaft 22 and a roll body 23 that is externally fitted to the support shaft 22 and is rotatable. The support shaft 22 is arranged in parallel with the drive shaft 19 and supported by the housing 21. The roll body 23 is provided so as to contact the roll body 20 of the drive roller 17.

  A spring 24 as an elastic member is placed between the support shaft 22 of the driven roller 18 and the housing 21. The driven roller 18 is always biased toward the drive roller 17 by the biasing force of the spring 24. Has been. As a result, the roll body 23 of the driven roller 18 and the roll body 20 of the drive roller 17 are pressed against each other to form a nip N1.

  The loop forming roller 16 corresponds to a characteristic component of the present invention, and will be described below with reference to FIGS. In this loop forming roller 16, the paper P is transported toward the non-rotating registration roller 12, and the front end side in the transport direction of the paper P is received by the registration roller 12 to form a loop B on the paper P to be inclined. It is configured to correct the line (skew). That is, when the loop B is formed on the paper P, the entire leading edge in the transport direction is brought into contact with the registration roller 12, and even if the leading edge in the transport direction in the paper P is initially inclined (that is, on the paper P). When skew (skew) has occurred, the leading edge of the paper P in the transport direction is corrected so that the transport direction is orthogonal.

The loop forming roller 16 includes a driving roller 25 and a driven roller 26 that is driven by driving of the driving roller 25 and corresponds to the pinch roller of the present invention. ing.
The drive roller 25 includes a drive shaft 27 that contacts the support shaft of the present invention, a plurality (two in the illustrated example) of roll bodies 28 that surround the drive shaft 27, and adjacent roll bodies 28 of the plurality of roll bodies 28. The joint 29 corresponding to the second joint mechanism of the present invention, which is connected so as to be integrally rotatable, that is, synchronously rotatable, and any one of the plurality of roll bodies 28 (in FIG. 3, And a one-way clutch 30 provided on the drive shaft 27 adjacent to the right roll body 28b).

  The drive shaft 27 extends in the width direction W of the paper P and is supported rotatably with respect to the housing 21. A rotation output from a rotation output shaft (not shown) of the motor is given to one end portion of the drive shaft 27, and the drive shaft 27 is driven to rotate by the rotation driving of the motor. It is configured. Each roll body 28 is arranged so as to be rotatable at a predetermined interval in the axial direction of the drive shaft 27 near the center portion of the drive shaft 27.

Each roll body 28 includes an inner cylinder 31 and an outer cylinder 32. The inner cylinder 31 is formed using, for example, a hard synthetic resin, and the outer cylinder 32 is formed using, for example, an elastic body such as rubber or sponge.
The inner peripheral surface of each inner cylinder 31 faces the outer peripheral surface of the drive shaft 27 and is rotatably supported by the drive shaft 27. The inner peripheral surface of the corresponding outer cylinder 32 is fitted to the outer peripheral surface of each inner cylinder 31.

The drive roller 25 will be described with reference to the perspective view of FIG. 4. The drive roller 25 includes a joint 29. The joint 29 is a member disposed between one roll body 28a and the other roll body 28b and having an outer diameter smaller than the outer diameter of the roll body 28, and a cylinder that rotatably surrounds the drive shaft 27. It has a shape. The outer peripheral surface of the joint 29 faces the paper transport path L1 (see FIG. 2), and consideration is given so as not to obstruct the transport of the paper P through the paper transport path L1.
The joint 29 is configured using one or a plurality of members (two in the illustrated example). Specifically, the joint 29 includes a cylindrical first member 33 and a cylindrical second member 34. The first member 33 and the second member 34 are arranged in the axial direction of the drive shaft 27.

  FIG. 5 is an exploded perspective view of a main part of the drive roller 25. Hereinafter, description will be given with reference to FIG. The first member 33 of the joint 29 is disposed adjacent to one roll body 28a. And the one end part 33a of this 1st member 33 is notched, and the recessed part 35 is formed.

One or a plurality of the concave portions 35 (two in the illustrated example) are provided, and are arranged at equal intervals in the circumferential direction of the first member 33. Each recess 35 is formed in a groove shape, and is open to the second member 34 side. A convex portion 36 is formed between one concave portion 35 and the other concave portion 35 of the one end portion 33a. The convex portion 36 protrudes toward the second member 34 side.
The other end portion 33b of the first member 33 is formed with a concave portion 35 and a convex portion 36 similarly to the one end portion 33a (in FIG. 5, only a part of each of the concave portion 35 and the convex portion 36 is illustrated. ). Each recessed part 35 of the other end part 33b is open | released by the one roll body 28a side. The convex part 36 protrudes to the one roll body 28a side.

The position of the convex portion 36 (concave portion 35) of the one end portion 33a and the position of the convex portion 36 (concave portion 35) of the other end portion 33b are only a predetermined angle such as 90 ° with respect to the circumferential direction of the first member 33. It is off.
The second member 34 has the same configuration as the first member 33. The positions of the first member 33 and the second member 34 in the circumferential direction are aligned.

Each recessed part 35 of the one end part 34a of the 2nd member 34 is open | released at the other roll body 28b side. Each convex part 36 of the one end part 34a of the second member 34 protrudes toward the other roll body 28b.
Each recess 35 of the other end 34b of the second member 34 is open to the first member 33 side. Each convex part 36 of the other end part 34b of the second member 34 protrudes toward the first member 33 side.
The one end portion 33a of the first member 33 and the other end portion 34b of the second member 34 are connected by fitting the concave portions 35 corresponding to the respective convex portions 36.
The connection between the first member 33 and the one roll body 28a is configured as follows. A convex portion 37 and a concave portion 38 are formed on the inner peripheral surface 31a of the inner cylinder 31 of the one roll body 28a. These convex portions 37 and concave portions 38 are arranged in the circumferential direction of one roll body 28a (in FIG. 5, only a part of the convex portions 37 and the concave portions 38 are shown). A plurality of convex portions 37 are formed corresponding to the concave portions 35 of the other end portion 33b of the first member 33, and are fitted into the concave portions 35 of the other end portion 33b. Similarly, a plurality of concave portions 38 are formed corresponding to the convex portions 36 of the other end portion 33b, and are fitted into the convex portions 36 of the other end portion 33b.

  The connection between the second member 34 and the other roll body 28b is as follows. On the inner peripheral surface 31a, similarly to the inner peripheral surface 31a of the inner cylinder 31 of one roll body 28a, a convex portion 37 and a concave portion 38 are formed. The convex portion 37 of the inner peripheral surface 31 a of the other roll body 28 b is fitted in the concave portion 35 of the one end portion 34 a of the second member 34. Similarly, the concave portion 38 of the inner peripheral surface 31 a of the other roll body 28 b is fitted into the convex portion 36 of the one end portion 34 a of the second member 34.

  The one-way clutch 30 is provided on the drive shaft 27 at a position adjacent to any one of the plurality of roll bodies 28 (in the illustrated example, the roll body 28b), and the adjacent roll body 28b. Is connected through a joint mechanism (first joint mechanism) that transmits only rotation around a support shaft, which will be described later. The diameter of the one-way clutch 30 is determined to be smaller than the diameter of the roll body 28b, and consideration is given so as not to hinder the conveyance of the paper P.

  The one-way clutch 30 is configured in the same manner as a well-known one-way clutch. Accordingly, the one-way clutch 30 is configured so that the other roll body 28b is rotated in accordance with the rotation of the drive shaft 27 only when the drive shaft 27 is rotationally driven in one of the circumferential directions (rotation direction R1 in the illustrated example). , The joint 29 is rotated by the rotation of the roll body 28 b, and the one roll body 28 a is rotated by the rotation of the joint 29, whereby the plurality of roll bodies 28 can be rotated integrally.

  The connection between the one-way clutch 30 and the other roll body 28 b includes the connection mechanism between the first member 33 and the second member 34 of the joint 29, the one roll body 28 a, and the first member 33 of the joint 29. And the other roll body 28b and the connection mechanism between the second members 34 of the joint 29 are connected via a joint mechanism of the same type.

  That is, the connection between the one-way clutch 30 and the other roll body 28b is made by integrating a plurality of (two in the illustrated example) convex portions 30a at equal intervals at the end of the one-way clutch 30 on the other roll body 28b side. In addition, the concave portions 32a corresponding to the convex portions 30a are provided at the end of the other roll body 28b on the one-way clutch 30 side, and the convex portions 30a are fitted into the concave portions 32a.

  In the illustrated example, the recess 32a provided at the end of the other roll body 28b is provided in the inner cylinder 31 corresponding to the outer cylinder 32 of the other roll body 28b. Can be secured, the inner cylinder 31 may be protruded greatly in the axial direction of the drive shaft 27 like the one roll body 28a, and a recess 32a may be provided in the protruding portion.

As described above, since the one-way clutch 30 is provided apart from the other roll body 28b, even if the other roll body 28b is pressed from a roll body 43b described later and an external force is applied, it is affected. It has the feature that there is nothing. That is, when an external force that presses the roll body 28 b is applied, the roll body 28 b is moved in the pressing direction by this pressing force, but the concave portion 32 a and the convex portion 30 a are fitted in the circumferential direction of the drive shaft 27. Therefore, the concave portion 32a and the convex portion 30a are separated from each other, thereby preventing the pressing force applied to the roll body 28b from being transmitted to the one-way clutch 20.
Moreover, even if the one-way clutch 30 is provided apart from the other roll body 28b, both are connected via a joint mechanism composed of the convex portion 30a and the concave portion 32a. Is reliably transmitted to the other roll body 28b. That is, since the concave portion 32a and the convex portion 30a are fitted in the circumferential direction of the drive shaft 27, the rotational force can be transmitted from the one-way clutch 30 side to the roll body 28b side. This can be transmitted to the rotational force roll body 28b of the shaft 27.

  As shown in FIG. 3, a bearing 39 is interposed between the inner peripheral surface 31 a of the inner cylinder 31 of one roll body 28 a and the outer peripheral surface 27 a of the drive shaft 27. The body 28a is supported by the drive shaft 27 so as to be relatively rotatable. Further, each roll body 28, joint 29 and one-way clutch 30 of the drive roller 25 are sandwiched between a pair of retaining rings 40 and 41 attached to the drive shaft 27, so that the drive shaft 27 is moved in the axial direction. It is regulated.

  As shown in FIGS. 2 and 3, the driven roller 26 includes a support shaft 42 and a plurality of roll bodies 43 that are externally fitted to the support shaft 42 and are rotatable. The support shaft 42 extends in parallel with the drive shaft 27 of the drive roller 25, and both ends thereof are supported by the housing 21. Each roll body 43 is provided corresponding to the number of roll bodies 28 of the driving roller 25. That is, the roll bodies 43a and 43b are provided corresponding to the roll bodies 28a and 28b.

  A spring 44 as an elastic member is placed between the support shaft 42 of the driven roller 26 and the housing 21, and the driven roller 26 is always attached to the drive roller 25 side by the biasing force of the spring 44. It is energized. Thereby, each roll body 43 of the driven roller 26 and the corresponding roll body 28 of the driving roller 25 are pressed to form a nip N2.

  The transport device 5 configured as described above operates as follows during image formation. When the paper P is sent out from the paper storage unit to the paper transport path L1, the registration roller 12 of the transport device 5 is stopped without being driven to rotate. On the other hand, the loop forming roller 16 has its drive shaft 27 driven to rotate in the rotational direction R1, and each roll body 28 rotates integrally with the drive shaft 27 via the one-way clutch 30 or the like. Each roll body 43 of the driven roller 26 rotates with the rotation.

  When the leading end of the sheet P reaches the nip N <b> 2 of the loop forming roller 16, the sheet P fed from the sheet storage unit is conveyed toward the registration roller 12 by the loop forming roller 16. As a result, the paper P is received at the nip N1 of the non-rotating registration roller 12 at the leading end of the conveyance, and a loop B is formed on the paper P. At this time, the entire leading end side of the sheet P is in contact with the nip N1 of the registration roller 12, and the skew (skew) of the sheet P is corrected. That is, correction is performed so that the leading edge of the paper P in the transport direction is orthogonal to the transport direction.

  When the skew (skew) of the paper P is corrected, the loop forming roller 16 stops rotating and stops the conveyance of the paper P. Specifically, the rotation drive of the drive shaft 27 is stopped, and the rotation of each roll body 28 of the drive roller 25 is stopped. Accordingly, the rotation of each roll body 43 of the driven roller 26 is also stopped. At this time, the one roll body 28 a and the other roll body 28 b of the drive roller 25 are connected via the joint 29, so that they are stopped at the same timing.

Next, the registration roller 12 starts to rotate at a predetermined timing, and the timing at which the toner image formed on the photosensitive drum 6 reaches the transfer position T coincides with the timing at which the paper P reaches the transfer position T. In this way, the paper P is transported.
Here, since each roll body 28a, 28b of the drive roller 25 of the loop forming roller 16 is connected to the drive shaft 27 via the one-way clutch 30, only each roll body 28 is rotationally driven in the rotational direction R1. In this case, the drive shaft 27 is not rotated, and each roll body 28 can idle with respect to the drive shaft 27.

Therefore, when the paper P is conveyed by the registration rollers 12 and each roll body 28 is rotated by the paper P, the roll body 28 of the driving roller 25 is idled in the rotation direction R1. That is, the sheet P conveyed toward the transfer position T by the registration roller 12 is smoothly conveyed without being blocked by the roll members 28 and 43 of the loop forming roller 16.
In order to eliminate the loop of the paper P, the peripheral speed of the registration roller 12 is set slightly faster than the peripheral speed of the loop forming roller 16. Therefore, when no loop is formed on the paper P, the paper P is transported in a pulled state. Therefore, the circumferential speed of the registration roller 12 and the circumferential speed of the loop forming roller 16 are absorbed by the one-way clutch 30 provided on the loop forming roller 16.

  As described above, according to this embodiment, since the one-way clutch 30 is provided apart from the other roll body 28b, the other roll body 28b is pressed from the roll body 43b and an external force is applied. Therefore, the one-way clutch 30 can be prevented from being damaged, and the one-way clutch 30 can have a longer life.

  Further, since the roll bodies 28 of the driving roller 25 of the loop forming roller 16 are connected to each other via a joint 29 so as to be integrally rotatable, the rotation can be stopped at the same timing. When the drive of 16 is stopped and the formation of the loop B on the paper P is completed, the rotation stop timings of the roll bodies 28 are matched to match the feed amounts of the paper P by the roll bodies 28. it can. Accordingly, the paper P is not twisted, and as a result, it is possible to effectively prevent the paper P from being wrinkled when the paper P is being conveyed by the registration rollers 12.

  Although one embodiment of the present invention has been described in detail with reference to the drawings, the specific configuration is not limited to the above-described embodiment, and design changes and the like can be made without departing from the scope of the present invention. Is possible.

For example, in the above-described embodiment, each roll body 28 is connected via the joint 29 and only one one-way clutch 30 is provided. However, the joint 29 is omitted and one roll corresponding to each roll body 28 is provided. A directional clutch 30 can also be provided. However, as described above, when each roll body 28 is connected via the joint 29 and only one one-way clutch 30 is provided, the cost can be reduced.
Furthermore, although the apparatus to which the conveying apparatus according to the present invention is applied is a copying machine, it is needless to say that the apparatus may be another apparatus such as a facsimile machine or a multifunction machine.

1 is a longitudinal sectional view showing a schematic configuration of a copying machine to which a conveying device according to an embodiment of the present invention is applied. FIG. 2 is an enlarged view of a conveyance device portion of a copying machine to which a conveyance device according to an embodiment of the present invention is applied. It is the sectional view on the AA line of FIG. It is a perspective view of the drive roller part of a loop formation roller. It is a disassembled perspective view of the drive roller part of a loop formation roller.

Explanation of symbols

  5 ... Conveying device, 12 ... Registration roller, 16 ... Loop forming roller, 25 ... Drive roller, 26 ... Driven roller (pinch roller), 29 ... Joint (second joint mechanism), 27 ... Drive Shaft (support shaft), 30 ... one-way clutch, 30a ... convex portion (first joint mechanism), 32a ... concave portion (first joint mechanism) B ... loop, P ... paper

Claims (3)

A conveying device comprising a registration roller that receives a leading edge piece of a sheet when not rotating, and a loop forming roller that conveys the sheet to the registration roller when not rotating and forms a loop on the sheet,
The loop forming roller is
A drive roller that is rotatably supported on a support shaft;
A pinch roller provided facing the drive roller;
When it is provided on the support shaft at a position adjacent to the drive roller and connected to the drive roller through a first joint mechanism that transmits only rotation around the support shaft, and the support shaft is rotated in one direction. A one-way clutch that transmits the rotation of the spindle only to the drive roller;
A conveying apparatus comprising:   A plurality of the drive rollers are provided on the support shaft at a predetermined interval, and the plurality of drive rollers are connected via a second joint mechanism rotatably supported on the support shaft, and the one-way The conveying device according to claim 1, wherein the clutch is provided at a position adjacent to any one of the plurality of driving rollers. The first joint mechanism is configured by a recess and a protrusion that can be fitted in the circumferential direction of the support shaft on the drive roller side and the one-way clutch side, respectively. 2. The transfer apparatus according to 2.

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