JPH08333036A - Paper sheet carrying device - Google Patents

Abstract

PURPOSE: To provide a paper sheet carrying device which does not cause the collection of paper dust and can maintain a stable position adjusting carrying function and can handle assembly and paper jamming with ease. CONSTITUTION: When a paper sheet P sags, a ring securing groove 37 comprising a small diameter section corresponding to a paper sheet carrying section is formed in a first roller 34A positioned in the direction to which the front end of the paper sheet directs and a paper sheet guiding ring 38A whose curvature is formed larger than that of the first roller 34A is secured in the ring securing groove 37 and is rotated with the outer peripheral face brought into contact with a second roller 35A. This constitution can prevent the front end of a paper sheet from going into the gap G between the first roller 34A and guide plate 46 by the paper sheet guiding ring 38A.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet conveying apparatus applied to an image forming apparatus such as an electronic copying apparatus or a laser printer, and more specifically, it aligns the leading edge of a sheet which is an image recording medium. The present invention relates to a sheet conveying device that conveys a sheet.

[0002]

2. Description of the Related Art Generally, in an image forming apparatus such as an electronic copying apparatus or a laser printer, a sheet conveying apparatus having a pair of aligning rollers is provided to align the leading edge of the sheet fed to the image transfer section of the image forming means. That is, the tip inclination (skew) is corrected and the timing of feeding to the image transfer portion is obtained.

A sheet conveying device is shown in FIGS. 13 and 1.
As shown in FIG. 4, an aligning roller pair d composed of two rollers b and c that rolls in contact with the sheet conveying path a from above and below, and a vertical direction that guides the sheet P to the roller contact portion e of the aligning roller pair d. A pair of guide plates h including guide plates f and g is provided.

The sheet P fed from a cassette (not shown) is conveyed along the sheet conveying path a, and the leading end of the sheet P hits the roller contact portion e of the aligning roller pair d. At this time, the upper and lower rollers b and c are stationary. After that, after the conveyed paper P is sufficiently bent as shown in the figure, the upper and lower rollers b and c start to rotate, and the paper P whose tip inclination (skew) is corrected is conveyed to an image transfer section (not shown). To do.

A thin plate of polyethylene terephthalate (hereinafter referred to as "Mylar") h is attached to the tip of the lower guide plate f in contact with the lower roller b.
When the paper P is bent, the leading end of the paper P is prevented from entering the gap G between the lower roller b and the lower guide plate f positioned in the bending direction of the paper P. .

However, in the conventional method for preventing the leading edge of the sheet using the mylar h, the mylar h is brought into contact with the aligning roller b, so that the mylar h
Paper dust j (see FIG. 14) accumulates on the paper, and the paper dust j becomes a conveyance resistance of the paper P and causes paper jam, and also causes early wear of the roller b and hinders a long life.

[0007] Mylar h has a weak waist and is easily bent, so that it is easy to bend during assembly and paper jam handling.
In order to prevent the mylar h from being bent or damaged, it is necessary to handle it with sufficient care, which causes a problem of poor workability.

[0008]

As described above, in the conventional sheet conveying apparatus having a pair of aligning rollers, it is possible for a mylar to prevent the leading edge of the sheet from entering the gap between the aligning roller and the guide plate. Since the thin plate member is used for prevention, there is a problem such as paper jam due to adhesion of paper dust on the thin plate member and early wear of the roller, so that a stable aligning and conveying function cannot be maintained. Furthermore, there is a risk that the thin plate member may be bent or damaged during assembly, handling of paper jams, etc., so care must be taken when handling it.
There is a problem that workability is poor.

The present invention has been made based on the above circumstances, and is free from the problem of paper dust accumulation, can maintain a stable aligning and conveying function, and is easy to handle such as assembling and handling paper jams. The purpose is to provide.

[0010]

As a first means for solving the above-mentioned problems, the present invention has a first roller and a second roller which are in rolling contact with each other with a sheet conveying path interposed therebetween, and the sheet is bent. The first position when the tip is oriented in the direction
The roller has a ring annular groove formed of a small-diameter portion corresponding to the sheet conveying section, and has a pair of aligning rollers for aligning and conveying the leading edge of the sheet and a curvature of the aligning roller pair which is greater than that of the first roller. And a paper guide ring that is formed in a large size and is mounted in the ring mounting groove in a state where the outer peripheral surface is in contact with the second roller, and that rotates in conjunction with the rotational movement of the aligning roller pair. It is configured as follows.

Further, as a second means, there is a lower first roller and an upper second roller which roll-contact while sandwiching the paper transport path from above and below, and the lower first roller is the paper transport unit. A ring annular groove formed of a small diameter portion is formed correspondingly to the aligning roller pair for aligning and transporting the leading edge of the sheet and the lower first roller of the aligning roller pair. And a rigid paper guide ring which is formed with a wall thickness smaller than the depth of the ring annular groove and is rotatably attached to the ring annular groove, and an outer peripheral surface of the paper guide ring. And a ring biasing mechanism that biases the second upper roller so as to press the second roller and rotates the sheet guide ring in association with the rotational movement of the aligning roller pair. With That.

Further, as a third means, a first roller made of a lower aluminum or resin roller and a second roller made of an upper rubber roller which roll-contact while sandwiching the sheet conveying path from above and below.
And a first roller on the lower side has a ring annular groove formed of a small diameter portion corresponding to the sheet conveying portion,
A pair of aligning rollers that align and transport the leading edge of the paper,
The aligning roller pair is made of the same material as the lower first roller, has a curvature larger than that of the first roller, and is formed with a wall thickness smaller than the depth of the ring annular groove. A rigid paper guide ring rotatably mounted in the ring groove, a pressing roller rollingly contacting a position opposite to the rolling contact position of the second roller on the upper side of the paper guide ring, and the pressing roller. A spring for pushing up the sheet guide ring is urged toward the second roller side so that the outer peripheral surface of the paper guide ring is in pressure contact with the second roller composed of an upper rubber roller, and is interlocked with the rotational movement of the pair of aligning rollers. A ring urging mechanism for rotating the paper guide ring is provided.

Further, as a fourth means, there is provided a lower first roller and an upper second roller which are in rolling contact with the sheet conveying path sandwiched from above and below, and the lower first roller is the sheet conveying section. A ring annular groove formed of a small diameter portion is formed correspondingly to the aligning roller pair for aligning and transporting the leading edge of the sheet and the lower first roller of the aligning roller pair. A paper guide formed of an endless rubber belt which is formed and is rotated in conjunction with the rotational movement of the aligning roller pair by being annularly mounted in the ring annular groove so that the outer peripheral surface is pressed against the upper second roller. And a ring.

Further, as a fifth means, there is provided a first roller which is a lower rubber roller and a second roller which is an upper aluminum or resin roller and which rolls in contact with the sheet conveying path from above and below in a vertical direction. The first roller on the side is formed with a ring annular groove having a small diameter portion corresponding to the sheet conveying section, and an aligning roller pair for aligning and conveying the leading edge of the sheet and the arrangement of the aligning roller pair are arranged. A first guide plate on the lower side and a second guide plate on the upper side with their ends facing in the vicinity of the contact portion between the first roller and the second roller, upstream of the position in the sheet conveying direction; The guide plate pair that guides the sheet to the contact portion has a curvature larger than that of the lower first roller of the aligning roller pair, and has the same wall thickness as the depth of the ring annular groove. And the outer peripheral surface is the upper side By being mounted in the ring mounting groove so as to be in pressure contact with the second roller, the lower side having the rigidity capable of rotating in a circular shape in conjunction with the rotational movement of the aligning roller pair. It is configured to include a first roller and a paper guide ring made of an endless belt made of the same material.

Further, as a sixth means, there is provided a first roller made of a lower aluminum or resin roller and a second roller made of an upper rubber roller which roll-contact while sandwiching the paper conveyance path from above and below, and a lower roller. The first roller on the side is formed with a ring annular groove having a small diameter portion corresponding to the sheet conveying section, and an aligning roller pair for aligning and conveying the leading edge of the sheet and the arrangement of the aligning roller pair are arranged. A first guide plate on the lower side and a second guide plate on the upper side with their ends facing in the vicinity of the contact portion between the first roller and the second roller, upstream of the position in the sheet conveying direction; The guide plate pair that guides the sheet to the contact portion has a curvature larger than that of the lower first roller of the aligning roller pair, and has the same wall thickness as the depth of the ring annular groove. And the outer peripheral surface is the upper side The first of the lower side rotates in conjunction with the rotational movement of the aligning roller pair by being installed circumferentially around the ring TamakiSomizo in pressure-contact with the second roller
It is configured to include a roller and a paper guide ring made of the same material.

[0016]

According to the sheet conveying device of the present invention, when the sheet is bent, the first roller positioned in the direction in which the leading edge of the sheet is oriented has a ring annular groove having a small diameter portion corresponding to the sheet conveying section. And a paper guide ring having a curvature larger than that of the first roller is installed in the ring annular groove and is rotated, so that the paper guide ring is used to rotate between the first roller and the guide plate. It is possible to prevent the leading edge of the paper from entering the gap. As a result, there is no problem of paper dust accumulation as in the case of using a conventional thin plate member such as Mylar, a stable aligning and conveying function can be maintained, and handling such as assembling and paper jam handling becomes easy.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. FIG. 1 shows a configuration of a main part of an image forming apparatus to which a sheet transporting device 10A of the present invention is applied. In the figure, reference numeral 20 denotes a photoconductive drum as a rotatably provided image carrier.

Around the photosensitive drum 20, a charging device 21 for uniformly positively charging the surface of the photosensitive drum 20 along the rotation direction (direction of arrow A), and irradiating the photosensitive drum 20 with light. By doing so, the exposure device 22 that forms an electrostatic latent image on the photoconductor drum 20, and the electrostatic latent image formed on the surface of the photoconductor drum 20 is developed with toner to develop a toner image T.
A developing device 23 for forming I is arranged in order.

Further, the photosensitive drum 2 is provided downstream of the developing device 23 in the rotational direction of the photosensitive drum 20.
Transfer device 24 that electrostatically transfers the toner image TI formed on the sheet of paper P to the transfer target sheet P, and the sheet P to which the toner image TI has been transferred is electrostatically transferred from the photoconductor drum 20. A peeling device 25 for peeling off the toner T and a cleaning device 26 for removing the toner T remaining on the photosensitive drum 20 are provided. Further, the charging device 21 and the exposure device 22
An LED erase array 27 that removes the electric charge in the non-image forming area is provided therebetween.

Further, the toner image TI is transferred by passing through the paper transfer device 10A of the present invention which guides the paper P to the image transfer portion 28 between the transfer device 24 and the photoconductor drum 20 and the image transfer portion 28. A sheet conveying device 29 (not shown in detail) that conveys the discharged sheet P toward a sheet discharging unit (not shown) is provided.

Next, the image forming process will be described. First, when the print switch (not shown) is turned on, the photosensitive drum 20 starts rotating in the direction of arrow A. At the same time, when the charging device 21 is turned on, the surface of the photoconductor drum 20 is uniformly charged.

After that, the exposure device 22 operates to irradiate the surface of the photoconductor drum 20 with light according to image information, and an electrostatic latent image is formed on the photoconductor drum 20. Then, the electrostatic latent image is opposed to the developing device 23 so that toner adheres thereto, and a toner image TI is formed on the photoconductor drum 20.

Then, the toner image TI is sent to the image transfer portion 28 as the photosensitive drum 20 rotates.
On the other hand, the paper P is sent to the image transfer unit 28 via the paper transport device 10A at the same timing as the operation of forming the toner image TI on the photosensitive drum 20.

The transfer device 24 is provided on the back surface of the paper P.
The toner image TI on the photoconductor drum 20 is electrostatically transferred to the paper P by the electric charge. The sheet P to which the toner image TI has been transferred is peeled from the surface of the photoconductor drum 20 by an electrostatic peeling operation by a peeling device 25 provided adjacent to the transfer device 24, and is not shown by the paper conveying device 29. It is conveyed toward the fixing device.

On the other hand, after the toner image TI is transferred to the paper P, the cleaning device 26 removes the residual toner T from the photosensitive drum 20, and the photosensitive drum 20 becomes in a clean state to enable the next image forming operation. There is.

Further, the sheet conveying apparatus 10A of the present invention is roughly classified into an aligning mechanism 30A as an aligning means for aligning and conveying the leading edge of the sheet P, and a sheet arranged more than the arrangement position of the aligning mechanism 30A. A pre-stage guide means 31 provided upstream in the transport direction to guide the sheet P to the aligning mechanism 30A, and a sheet P provided downstream in the sheet transport direction from the position where the aligning mechanism 30A is disposed, guides the sheet P to the image transfer unit 28. It is composed of a rear-stage guide means 32.

As shown in detail in FIGS. 2 and 3, the aligning mechanism 30A includes aligning rollers 34A and 35A which rollly contact the paper transport path 33 with the paper transport path 33 sandwiched from above and below to align and transport the leading edge of the paper P. It has a pair of aligning rollers 36A for performing.

The lower first aligning roller (hereinafter referred to as the first roller) 34A is made of aluminum or resin roller. The upper second aligning roller (hereinafter referred to as the second roller) 35A is a rubber roller.

Further, as shown in FIGS. 3 and 4, the first roller 34A on the lower side has a plurality of ring ring mounting grooves 37 each having a small diameter portion corresponding to the sheet conveying portion at intervals. In this embodiment, there are three (3) places formed, and the ring guide grooves 38 ..
Is rotatably mounted.

The paper guide rings 38A ... In the present embodiment, the lengths 280 to 280 of the lower first roller 34A.
With respect to 300 mm (L ₁ = 280 to 300 mm), one is provided at the middle portion in the length direction, and 90 mm (L ₂ = 90 mm) is offset in both directions with reference to this middle portion.

Further, the paper guide ring 38A is made of the same material as the lower first roller 34A, and the first roller 34A
The curvature is larger than A, that is, in this embodiment, the outer diameter of the first roller 34A is set to 40 mm (D = 40 mm) with respect to the outer diameter of 20 mm (d = 20 mm), and the width is 10 mm (W = W). 10 mm) is set.

Further, the paper guide ring 38A is shown in FIG.
As shown in, the thickness dimension is smaller than the depth dimension h of the ring annular groove 37 ...
It is formed with a wall thickness of about t = 1.2 mm with respect to 1.5 mm.

Further, as shown in FIGS. 2 and 3, the paper guide rings 38A ...
Are urged upward by the ring urging mechanism 40 so as to come into pressure contact with the second rollers 35A each of which is an upper rubber roller.

The ring urging mechanism 40 has a pressing roller 41 that is in rolling contact with a position opposite to the rolling contact position with the second roller 35A on the upper side of the paper guide ring 38A, and a spring 42 that pushes up the pressing roller 41. It has been configured. Then, the second roller 35 including the upper rubber roller
The paper guide ring 38A can rotate in association with the rotational movement of A due to its surface resistance.

Further, as shown in FIG. 1 and FIG. 2, the front-stage guide means 31 is located on the lower side of which the end is exposed in the vicinity of the contact portion 45 between the first roller 34A and the second roller 35A. It is composed of a guide plate pair 48 having a first guide plate 46 and an upper second guide plate 47.

Further, as shown in FIG. 3, the paper guide rings 38A ... At the tip of the lower first guide plate 46.
Are formed so as to avoid interference with the first guide plate 46 and the first roller 34A. The gap G between the outer peripheral surface and the peripheral surface is made as small as possible.

Then, the paper P fed from the cassette (not shown) is conveyed through the paper conveyance path 33, and the front end of the paper P is aligned by the aligning roller of the aligning mechanism 30A by the guide plate pair 48 which is the front guide means 31. It hits the roller contact portion 45 of the pair 36A. At this time, the first roller 3
4A and the second roller 35A are stationary.

As a result, the conveyed paper P is sufficiently bent as shown in FIG. 2 to correct the tip inclination (skew). After that, the first roller 34A and the second roller 35A start to rotate, and the sheet P whose straight edge inclination has been corrected
Will be conveyed to the image transfer section 28.

Further, when the front end of the paper P is aligned, the front end of the paper P is guided by the outer peripheral surface of the rigid paper guide ring 38A ... Gap G between the first roller (lower roller) 34A positioned in the bending direction and the lower guide plate 46
It is possible to prevent the leading edge of the sheet P from entering the sheet (see FIG. 2).

At this time, the paper guide ring 38A ...
Are urged upward by the ring urging mechanism 40, and their outer peripheral surface portions are in pressure contact with the second roller 35A made of an upper rubber roller.
There is no gap formed that causes paper skew or paper wrinkles.

Further, the paper guide rings 38A ... Rotate in conjunction with each other by utilizing the surface resistance of the second roller 35A made of a rubber roller, thereby preventing the second roller 35A from being worn by the paper guide rings 38A.

Next, a second embodiment of the present invention will be described with reference to FIGS. In addition, the above-mentioned first
The same parts as those of the embodiment are attached with the same notations and an overlapping explanation will be omitted.

As shown in detail in FIGS. 7 and 8, the aligning mechanism 30B is composed of aligning rollers 34B and 35B which rollly contact the paper transport path 33 while sandwiching the paper transport path 33 from above and below to align and transport the leading edge of the paper P. It has a pair of aligning rollers 36B.

The lower first aligning roller (hereinafter referred to as the first roller) 34B is a rubber roller. The upper second aligning roller (hereinafter referred to as the second roller) 35B is made of aluminum or a resin roller.

Further, as shown in FIG. 8, the first roller 34B on the lower side has a plurality of ring ring mounting grooves 37 each having a small diameter portion corresponding to the sheet transporting portion at intervals (this embodiment). Are formed in three places), and these ring ring mounting grooves 37 ...
Further, the paper guide rings 38B ... Are rotatably mounted.

Each of the paper guide rings 38B ... Is an endless belt formed of a rubber member made of the same material as the lower first roller 34B, and has a rigidity capable of maintaining a circular state and rotating.

These paper guide rings 38B ... In this embodiment, the lengths 280 to 280 of the lower first roller 34B.
One is provided in the middle portion in the length direction with respect to 300 mm, and the two pieces are displaced by 90 mm in both directions with reference to this middle portion.

The paper guide ring 38B is made of the same material as the lower first roller 34B, and the first roller 34B
The curvature is larger than B, that is, in this embodiment, the outer diameter of the first roller 34B is set to 40 mm with respect to the outer diameter of 20 mm, and the width thereof is set to 10 mm.

Further, the paper guide ring 38B is shown in FIG.
As shown in FIG. 7, the thickness is the same as the depth of the ring annular groove 37 .. For example, the depth h = 1.5 m.
It is formed with a thickness of t = 1.5 mm with respect to m.

The paper guide ring 38B is sandwiched between the lower first roller 34B made of a rubber roller and the upper second roller 35B made of an aluminum or resin roller to rotate the rollers 34B, 35B. The paper guide ring 38 is linked to the movement by its surface resistance.
B can rotate.

Therefore, when aligning the leading edge of the paper P,
The leading end of the paper P is guided by the outer peripheral surface of the paper guide ring 38B mounted on the first roller (lower roller) 34B, and the first roller (lower roller) 34B and the lower guide plate positioned in the bending direction of the paper P. The leading edge of the sheet P is prevented from entering the gap G (see FIG. 7) between the sheet 46 and the sheet 46.

At this time, the paper guide ring 38B ...
Have the same thickness as the depth of the ring annular mounting grooves 37 ... Therefore, each outer peripheral surface portion is in pressure contact with the second roller 35B composed of the upper rubber roller, and between them. The paper P is in a state in which a gap causing a paper wrinkle or a paper wrinkle is not formed.

Further, the paper guide rings 38B ... Are sandwiched between the lower first roller 34B made of a rubber roller and the upper second roller 35B made of an aluminum or resin roller, so that the rollers 34B, 35B are separated from each other. The paper guide ring 38 is interlocked with the rotational movement due to its surface resistance.
B rotates. As a result, the paper guide ring 38B itself made of a rubber belt does not become a conveyance resistance of the paper P. Further, abrasion of the second roller 35B due to the paper guide rings 38B ... Is prevented.

Next, referring to FIGS. 10 to 12,
A third embodiment of the present invention will be described. The same parts as those in the first embodiment described above are designated by the same reference numerals, and a duplicate description will be omitted.

As shown in detail in FIGS. 10 and 11, the aligning mechanism 30C is composed of aligning rollers 34C and 35C which rollly contact the paper transport path 33 with the paper transport path 33 sandwiched from above and below to align and transport the leading edge of the paper P. It has an aligning roller pair 36C for performing.

The lower first aligning roller (hereinafter referred to as the first roller) 34C is made of aluminum or a resin roller. The upper second aligning roller (hereinafter referred to as the second roller) 35C is a rubber roller.

Further, as shown in FIG. 11, the first roller 34C on the lower side has a plurality of ring ring mounting grooves 37 each having a small diameter portion corresponding to the sheet transporting portion at intervals (this embodiment). In three places) and these ring ring mounting grooves 37 are formed.
A paper guide ring 38C is rotatably attached to.

These paper guide rings 38C ... Are formed of aluminum or resin material of the same material as the lower first roller 34C, and have rigidity so that they can rotate while maintaining a circular shape. These paper guide rings 38C ... In this embodiment, the length of the lower first roller 34C is 280 to 300 m.
One is provided in the middle portion in the length direction with respect to m, and the arrangement is provided with a 90 mm offset in both directions with respect to this middle portion.

The paper guide ring 38C is made of the same material as the lower first roller 34C, and the first roller 34C
The curvature is larger than C, that is, in this embodiment, the outer diameter of the first roller 34C is set to 40 mm with respect to the outer diameter of 20 mm, and the width thereof is set to 10 mm.

Further, the paper guide ring 38C is shown in FIG.
As shown in FIG. 2, the thickness is the same as the depth dimension of the ring annular mounting grooves 37 ..., For example, the depth dimension h = 1.5.
The thickness is t = 1.5 mm with respect to mm.

The paper guide ring 38C has a lower first roller 34C made of aluminum or a resin roller,
By being sandwiched between the upper second roller 35C made of a rubber roller, the paper guide ring 38 is interlocked with the rotational movement of the rollers 34C and 35C by its surface resistance.
C can rotate.

Therefore, when aligning the leading edge of the paper P,
The leading end of the paper P is guided by the outer peripheral surface of the paper guide ring 38C mounted around the first roller (lower roller) 34C, and the first roller (lower roller) 34C and the lower guide plate positioned in the bending direction of the paper P. The leading edge of the sheet P is prevented from entering the gap G (see FIG. 11) between the sheet P and the sheet 46.

At this time, the paper guide ring 38C ...
Have the same thickness as the depth of the ring annular mounting grooves 37 ... Therefore, each outer peripheral surface portion is in pressure contact with the second roller 35C made of an upper rubber roller, and between them. The paper P is in a state in which a gap causing a paper wrinkle or a paper wrinkle is not formed.

Further, the paper guide rings 38C ... and the lower first roller 34C made of an aluminum or resin roller,
By being sandwiched between the upper second roller 35C made of a rubber roller, the paper guide ring 38 is interlocked with the rotational movement of the rollers 34C and 35C by its surface resistance.
C rotates. As a result, the paper guide ring 38C ...
The wear of the first roller 34C and the second roller 35C due to the above is prevented.

As described above, according to the present invention, when the paper P is bent, the paper is conveyed to the lower first roller 34A (34B, 34C) located in the direction in which the leading edge of the paper P is oriented. A ring guide groove 38A (38B) having a smaller diameter than that of the first roller 34A (34B, 34C) is formed in the ring guide groove 38 having a small diameter portion corresponding to each portion. , 38C) and the paper guide ring 38A
(38B, 38C) causes the first roller 34A (34
(B, 34C) and the guide plate 46 can prevent the leading edge of the sheet from entering the gap G.

Further, since the paper guide rings 38C ... Are used, there is no place where paper dust is accumulated as in the case of using a conventional thin plate member such as Mylar, and the cause of paper jam can be eliminated. In addition, roller wear due to accumulated paper dust is also eliminated, enabling longer life.

Further, since the paper guide rings 38C, ... Are not worried about being bent or damaged, care is not required during handling, and the work such as assembling and paper jam handling is simplified. The present invention is not limited to the above-described embodiments, and it goes without saying that various modifications can be made without departing from the spirit of the present invention.

[0068]

As described above, according to the present invention, there is no problem of paper dust accumulation, it is possible to maintain a stable aligning and conveying function, and the paper is easy to handle such as assembly and paper jam handling. A carrier device can be provided.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a configuration of a main part of an image forming apparatus to which a sheet conveying device according to a first embodiment of the present invention is applied.

FIG. 2 is a side view of the aligning mechanism portion of the embodiment.

FIG. 3 is a perspective view of an aligning mechanism portion of the embodiment.

FIG. 4 is a schematic configuration diagram of an aligning mechanism section of the embodiment.

FIG. 5 is an explanatory diagram showing a relationship between a ring annular mounting groove and a paper guide ring, which is a main part of the embodiment.

FIG. 6 is a schematic diagram showing a configuration of a main part of an image forming apparatus to which a sheet conveying device according to a second embodiment of the present invention is applied.

FIG. 7 is a side view of the aligning mechanism portion of the embodiment.

FIG. 8 is a perspective view of an aligning mechanism portion of the embodiment.

FIG. 9 is an explanatory view showing a relationship between a ring annular groove and a paper guide ring, which is a main part of the embodiment.

FIG. 10 is a side view of an aligning mechanism portion according to a third embodiment of the present invention.

FIG. 11 is a perspective view of an aligning mechanism portion of the embodiment.

FIG. 12 is an explanatory view showing a relationship between a ring annular groove and a paper guide ring, which is a main part of the embodiment.

FIG. 13 is a side view of an aligning mechanism portion of a conventional example.

FIG. 14 is a perspective view of an aligning mechanism portion of a conventional example.

[Explanation of symbols]

10A, 10B, 10C ... Paper transporting device, 28 ... Image transfer portion, 30A ... Aligning mechanism (aligning means), 31 ... Front guide means, 32 ... Rear guide means,
33 ... Paper transport path, 34A, 34B, 34C ... First aligning roller, 35A, 35B, 35C ... Second aligning roller, 36A, 36B, 36C ... Aligning roller pair, 37 ... Ring ring groove, 38A, 38B, 38
C ... Paper guide ring, 40 ... Ring biasing mechanism, 41 ...
Pressure roller, 42 ... Spring, 45 ... Contact portion, 46 ...
First guide plate, 47 ... Second guide plate, 48 ... Guide plate pair, G ... Gap, P ... Paper (transferred material).

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI Technical display location B65H 9/14 B65H 9/14 G03G 15/00 518 G03G 15/00 518

Claims (6)

[Claims] 1. A first roller having a first roller and a second roller which are in rolling contact with each other across a sheet conveying path, and a first roller positioned in a direction in which a leading end of the sheet is directed when the sheet is bent is a sheet conveying section. Correspondingly, a ring annular groove having a small diameter portion is formed, and the aligning roller pair for aligning and transporting the leading edge of the sheet and the first roller of the aligning roller pair are formed to have a larger curvature. A paper guide ring which is mounted in the ring mounting groove in a state where the outer peripheral surface is in contact with the second roller, and which rotates in conjunction with the rotational movement of the aligning roller pair. Paper transport device. 2. A lower first roller and an upper second roller which roll-contact while sandwiching a paper transport path from above and below, and the lower first roller corresponds to the paper transport unit and has a small diameter portion. An aligning roller pair that forms a ring ring mounting groove for aligning and transporting the leading edge of the sheet, and has a curvature larger than that of the lower first roller of the aligning roller pair, and the ring ring. A rigid paper guide ring that is formed with a wall thickness smaller than the depth of the mounting groove and is rotatably mounted in the ring mounting groove, and the outer peripheral surface of this paper guide ring is the upper second roller. A sheet urging mechanism that urges the second roller side so as to be in pressure contact, and rotates the sheet guide ring in conjunction with the rotational movement of the aligning roller pair. Transport device. 3. A first roller made of an aluminum or resin roller on the lower side and a second roller made of a rubber roller on the upper side, which rolls in contact with the sheet conveying path in the vertical direction, and has a lower first roller. An aligning roller pair, which forms a ring annular groove having a small diameter portion corresponding to the sheet conveying section, aligns and conveys the leading edge of the sheet, and the first roller below the aligning roller pair. It is made of the same material, has a curvature larger than that of the first roller, and is formed with a wall thickness smaller than the depth of the ring annular groove, and has rigidity that is rotatably attached to the ring annular groove. The paper guide ring has a pressing roller that comes into rolling contact with a position opposite to the rolling contact position between the paper guiding ring and the second roller above the paper guiding ring, and a spring that pushes up the pressing roller. A ring urging mechanism that urges the outer peripheral surface of the upper roller toward the second roller, which is an upper rubber roller, and rotates the sheet guide ring in conjunction with the rotational movement of the aligning roller pair. And a sheet conveying device. 4. A lower first roller and an upper second roller which roll-contact while sandwiching a sheet conveying path from above and below, and the lower first roller corresponds to a sheet conveying portion and has a small diameter portion. An aligning roller pair that forms a ring ring mounting groove for aligning and conveying the leading edge of the sheet, and a curvature larger than that of the lower first roller of the aligning roller pair, A sheet guide ring formed of an endless rubber belt that is rotated in conjunction with the rotational movement of the aligning roller pair by being mounted in the ring mounting groove so that its surface is pressed against the upper second roller;
A sheet conveying device comprising: 5. A first roller composed of a lower rubber roller and a second roller composed of an upper aluminum or resin roller which rolls in contact with the paper conveyance path sandwiched from above and below, and the lower first roller is A pair of aligning rollers that form a ring ring groove consisting of a small diameter part corresponding to the paper transport unit and that aligns and transports the leading edge of the paper, and the paper transport direction from the position where this aligning roller pair is arranged. An upper side second guide plate and a lower side first guide plate facing the upstream side and in the vicinity of the contact portion between the first roller and the second roller are provided, and the sheet is contacted by the contact portion. And a guide plate pair that guides to the first aligning roller pair, has a larger curvature than the lower first roller of the aligning roller pair, and has the same thickness dimension as the depth dimension of the ring annular groove, and has an outer peripheral surface. Pressure contact with the upper second roller As described above, the same material as that of the lower first roller, which has rigidity so as to rotate in a state of maintaining a circular shape in association with the rotational movement of the aligning roller pair by being annularly mounted in the ring annular groove, A sheet conveying device comprising a sheet guide ring formed of an endless belt. 6. A first roller composed of a lower aluminum or resin roller and a second roller composed of an upper rubber roller, which roll-contact while sandwiching a paper conveyance path from above and below, and the lower first roller is A pair of aligning rollers that form a ring ring groove consisting of a small diameter part corresponding to the paper transport unit and that aligns and transports the leading edge of the paper, and the paper transport direction from the position where this aligning roller pair is arranged. An upper side second guide plate and a lower side first guide plate facing the upstream side and in the vicinity of the contact portion between the first roller and the second roller are provided, and the sheet is contacted by the contact portion. And a guide plate pair that guides to the first aligning roller pair, has a larger curvature than the lower first roller of the aligning roller pair, and has the same thickness dimension as the depth dimension of the ring annular groove, and has an outer peripheral surface. Pressure contact with the upper second roller As described above, a paper guide ring made of the same material as the lower first roller, which rotates in conjunction with the rotational movement of the aligning roller pair by being mounted in the ring annular groove, is provided. Characteristic paper transport device.