JPH1059581A - Sheet material carrying device, and image recorder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure a wide space to facilitate the formation of a loop and processing of a jam, and improve quality by providing a guide which can expand a space for a carrying passage according to a carrying condition of a sheet material carried between two carrying means and holds a carrying position of the sheet material. SOLUTION: A sheet material P sandwiched between a driving roller 3a and a driven roller 3b is carried in the C direction from an upstream side sheet material first carrying part 3. This sheet material P is carried in the D direction along a sheet material carrying guide 2a as a first guide 2b and a guide member of a sheet material carrying guide part 2, and is carried to a downstream side sheet material second carrying part 4 along a second upper guide 2d. The sheet material carrying guide 2a of the sheet material carrying guide part 2 is rotatably supported by a first upper guide 2b of the sheet material carrying guide part 2, and a space area necessary to form a loop of the sheet material P is secured by rotation by a curve at loop forming time of the sheet material P.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet material for conveying a sheet material to a predetermined position while holding the sheet material between a pair of rotating cylindrical rollers, a cylindrical roller and a roller, a cylindrical roller and a pad, and the like. The present invention relates to a conveying device, for example, to a sheet material conveying device for conveying a sheet material for transferring and recording a document image in an image recording device.

[0002]

2. Description of the Related Art Conventionally, as a sheet conveying apparatus of this type, for example, a sheet is sandwiched between a pair of rotating cylindrical rollers, a cylindrical roller and a roller, a cylindrical roller and a pad, and the like. Transporting equipment is widely used,
These devices are arranged in a plurality of conveying sections to sequentially convey the sheet material. This is the rotation speed of the drive roller.
This is because the movement of the sheet material can be easily controlled by changing the ON / OFF timing.

[0003] Adjacent sheet material transport sections are arranged at positions that can simultaneously clamp the shortest sheet material transport length even in the most distant state. Further, each sheet material transport unit is generally not arranged on a straight line with respect to the transport direction due to the miniaturization of the apparatus and the configuration of each process.
The conveying direction of the sheet material is changed in each portion, and the sheet material is conveyed along a conveying guide portion provided between the two sheet material conveying portions until the sheet material is sandwiched between the two sheet material conveying portions.

FIG. 7 shows a conventional sheet conveying apparatus.

In the sheet conveying apparatus 100, the first sheet conveying section 1 on the upstream side with respect to the conveying direction of the sheet P.
01 is rotated in the direction A, the sheet material P sandwiched between the transport roller 101a and the pad 102 is moved to the upstream sheet material first transport unit 1
01 is transported in the B direction. The sheet material P conveyed in the B direction from the upstream sheet material first conveyance unit 101 is conveyed to the downstream sheet material second conveyance unit 104 along the lower guide 103a of the sheet material conveyance guide unit 103. .

[0006] The sheet material P is conveyed to the sheet material second conveying section 104 on the downstream side and goes to the roller pair 104a, 104.
b. A driving roller 104a rotates in the direction C and rotates the driven roller 104b in the direction D. If the downstream sheet material second transport unit 104 is a registration roller for adjusting the transport timing, the sheet material P contacts the roller unit of the sheet material second transport unit 104 where the rotation of the roller is stopped. After the contact, the sheet material P is further conveyed by the sheet material first conveyance unit 101 on the upstream side to form a loop. In order to form a loop of the sheet material P, a wide space is secured in the sheet material conveyance guide portion 103. After the loop of the sheet material P is formed, the roller unit of the sheet material second transport unit 104 starts rotating.

[0007]

However, in the case of the above-described prior art, the following problems have occurred.

When a sheet material is conveyed from one sheet material conveyance section to the next sheet material conveyance section, the conveyance behavior of the sheet material is unstable until it is clamped by both sheet material conveyance sections. In order to stably convey the sheet material, the space in the conveyance path should be narrow, but in order to perform jam processing and to form a loop for adjusting the conveyance timing by the sheet material conveyance unit on the downstream side, a large space is required. Space is needed,
Either of them had to be selected as the device.

That is, when the space in the conveyance path is narrowed, the conveyance behavior of the sheet material is stabilized, but the jam processing is difficult,
In addition, loop formation cannot be performed.

Further, when the space in the conveyance path is widened, the jam processing becomes easy and a loop can be formed. However, the sheet material is wavy due to the instability of the sheet material conveyance behavior. Flutter like that.

In order to reduce the fluttering of the sheet material, it is sufficient that each sheet material transporting portion is disposed at a position where the originally shortest sheet material transporting length can be held at the same time.
Each sheet conveying section is arranged at a position shorter than the length at which the shortest sheet conveying length can be simultaneously held. But,
When the conveyance direction of the sheet material changes greatly, the flutter of the sheet material tends to be larger. Also,
In the Duplo sheet feeding, since the sheet material conveying portion is provided only at the center with respect to the width direction of the sheet material, the fluttering of the sheet material is further increased even when the conveying direction of the sheet material does not greatly change. If the fluttering of the sheet material is large, the sheet material enters into the sheet material conveying unit, and the timing of changing the conveying direction of the sheet material may be shifted. This results in bending.

Further, in each sheet conveying section, a peripheral speed difference occurs due to a difference between each component, a difference unique to each component due to a difference in wear and an environmental condition, and a setting in processing. In this state, the sheet material conveyed from the upstream side swells greatly after rushing into the sheet material conveying section on the downstream side, and a fluttering sound is generated.

If the peripheral speed of the downstream sheet material transport section is faster than the peripheral speed of the upstream sheet material transport section, the sheet material transported from the upstream side enters the downstream sheet material transport section after entering the downstream sheet material transport section. Then, the sheet material is pulled, the upstream sheet material transport section becomes a brake, the resistance of the sheet material transport force increases, and after the sheet material transported from the upstream side enters the downstream sheet material transport section, , The sheet material is pulled and tightened,
The sheet material is in a string state, and noise is generated due to amplification of vibration of the sheet material.

This will be described in more detail with reference to FIG. The conveying direction E of the second sheet conveying section 104 on the downstream side moves the sheet P to the lower guide 103 of the sheet conveying guide section 103.
In the case where the sheet material P is separated from the sheet material b, the sheet material P is rapidly separated in the direction of the upper guide 103a of the sheet material conveyance guide portion 103, and fluttering occurs in a wavy manner. In particular, if there is a peripheral speed difference between the upstream sheet material first transport unit 101 and the downstream sheet material second transport unit 104, the flutter will increase.

Further, the sheet material P conveyed in the direction E and separated in the direction of the upper guide 103a of the sheet material conveyance guide portion 103 fits perfectly with the upper guide 103a of the sheet material conveyance guide portion 103 as shown in the figure. When the sheet material P moves to the position of F, the sheet material P becomes a resistance that impedes the conveyance force of the conveyance roller 101a of the upstream sheet material first conveyance unit 101, as indicated by the position G, and the sheet material P Causes a decrease in the transfer force of the sheet. Further, the resistance between the sheet guide P and the upper guide 103a of the sheet conveying guide 103 that is tightly attached also increases. This is also particularly true for the upstream sheet material first transport unit 101 and the downstream sheet material second transport unit 101.
If there is a difference in the peripheral speed of the transport unit 104, the influence is large.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art. It is an object of the present invention to secure a stable sheet material while securing a space for jam processing and loop formation of the sheet material. An object of the present invention is to provide a sheet conveying apparatus having a high quality capable of conveying a sheet and an image recording apparatus provided with such a sheet conveying apparatus.

[0017]

In order to achieve the above object, in a sheet conveying apparatus according to the present invention, a first conveying means on an upstream side for conveying a sheet while nipping the sheet is provided.
And a second conveying means on the downstream side that conveys the sheet material while nipping the sheet material conveyed by the first conveying means, and conveys the sheet material between the first conveying means and the second conveying means. And a guide for holding a sheet material transfer position capable of expanding a space for a transfer path in accordance with a sheet material transfer state to be performed.

Therefore, the sheet material conveyed between the first conveying means and the second conveying means is properly held at the conveying position in accordance with the state of the conveyance and the first conveying means. A wide space is secured between the means and the second transport means.

The guide is provided between the first transport means and the second transport means.
It is good to have a guide member which can be moved according to the bulge of the sheet material conveyed while curving between the sheet and the conveying means.

Therefore, the sheet material is guided while securing a wide space by the movable guide member.

The guide member is rotatably supported at one end, and guides the sheet conveying position by urging the curved outer surface of the conveyed sheet inward while curving the other end. In addition, the sheet member may be rotated in accordance with the bulge of the sheet material to the outside of the curve.

The guide member may include an urging member for urging the sheet conveyed while curving between the first conveying means and the second conveying means from the inside to the outside of the curve. .

Accordingly, the biasing member does not cause the sheet material to deviate inward from the transport position.

It is preferable that the urging member is urged so as to be able to follow a change in the tension of the conveyed sheet material.

Therefore, fluttering of the sheet material and a sudden change in the conveying direction are prevented.

[0026]

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, the dimensions of the components described in this embodiment,
The material, shape, relative arrangement, and the like are not intended to limit the scope of the present invention only to them unless otherwise specified. (First Embodiment) FIGS. 1 to 3 show a sheet conveying apparatus according to a first embodiment of the present invention.

In the sheet conveying apparatus 1, the sheet P
When the driving roller 3a of the first sheet conveying section 3 on the upstream side with respect to the conveying direction rotates in the direction A, the sheet material P sandwiched between the driving roller 3a and the driven roller 3b is moved upstream. Is conveyed in the C direction from the first sheet conveying section 3. The sheet material P conveyed in the C direction from the upstream sheet material first conveyance unit 3 is moved in the D direction along the first upper guide 2b of the sheet material conveyance guide unit 2 and the sheet material conveyance guide 2a as a guide member. The sheet is conveyed, and is conveyed along the second upper guide 2d to the second sheet conveying section 4 on the downstream side.

In the case where the second sheet transport section 4 on the downstream side is a registration roller for adjusting the transport timing, the roller of the second sheet transport section 4 in which the sheet material P stops rotating. After contact with the sheet material, the sheet material P is further conveyed by the sheet material first conveyance unit 3 on the upstream side,
As shown in FIG. 2, the sheet material P forms a loop.

The sheet conveying guide 2a of the sheet conveying guide 2 is a first upper guide 2 of the sheet conveying guide 2.
b, is rotatably supported by the sheet material P, and is rotated in the direction E by the curvature of the sheet material P when the loop is formed.
The space area necessary for the loop formation is secured.

In the first embodiment, the sheet material transport guide 2a presses the sheet material P inward by its own weight, and the sheet material transport guide 2a is bent by bending the sheet material P when forming a loop. Is rotated in the direction E. This pressing method does not depend on its own weight, but is appropriately pressed inward by pressing means such as a spring, and the sheet material P is conveyed by bending when forming a loop of the sheet material P. The guide 2a only needs to apply a pressing force that can rotate in the direction E.

Further, the sheet material conveyance guide 2a of the sheet material conveyance guide portion 2 is not rotatably supported as in this embodiment, but forms a loop when forming a loop of the sheet material P. It may be configured to retreat to a position where it does not interfere.

The sheet material P is transported along the second upper guide 2d of the sheet material transport guide portion 2 to the sheet material second transport portion 4 on the downstream side in the direction D, and goes downstream. Roller pair 4a, 4b. further,
The sheet material P is transported in the transport direction F.

As shown in FIG. 3, when the sheet material P is jammed before the second sheet material transport unit 4 on the downstream side,
Not only the sheet material conveyance guide 2a of the sheet material conveyance guide portion 2 but also the second upper guide 2d of the sheet material conveyance guide portion 2 rotates in the direction of the arrow, and is different from the sheet material conveyance route (in a different sheet material conveyance route). (Available) A large space area is secured, and jam clearing work can be easily performed.

When the sheet material P is no longer in a curved state as shown in FIGS. 2 and 3, the sheet material transport guide 2a of the sheet material transport guide unit 2 returns to the original position as shown in FIG. The space in the sheet material conveyance path is a narrow space area as before.

(Second Embodiment) FIGS. 4 and 5 show:
A second embodiment of the present invention is shown. In the first embodiment, the sheet material is guided by pressing the sheet material conveyed while being curved from the outside to the inside of the curve, but in the second embodiment, the sheet material is guided. The sheet material is guided by being urged from the inside to the outside by the urging means.

In the sheet conveying apparatus 11, the first sheet conveying section 13 on the upstream side with respect to the conveying direction of the sheet P
Is rotated in the direction A by
The sheet material P sandwiched between the transport roller 13a and the pad 13b is transferred from the upstream sheet material first transport portion 13 to
Conveyed in the direction. The sheet material P transported in the B direction from the upstream sheet material first transport unit 13 is transported in the C direction along the lower guide 15b of the sheet material transport guide unit 15,
The sheet is conveyed to the second sheet conveying section 14 on the downstream side.

The sheet material P is conveyed to the sheet material second conveying section 14 on the downstream side in the direction C and goes to the roller pair 14a, 1
4b.

A sheet urging member 12a as an urging member of the sheet urging section 12 is rotatably supported by a support arm 12b, and the support arm 12b is moved in the direction D by a spring or the like (not shown). Being pulled.

When the transport direction E of the second sheet transport section 14 on the downstream side is a direction in which the sheet material P is separated from the lower guide 15b of the sheet material transport guide section 15, the sheet material P suddenly becomes a sheet. Upper guide 15 of material transport guide section 15
Although the sheet material P is separated in the direction of a, the sheet material P contacts the sheet material urging member 12a of the sheet material urging unit 12 at the position S1 and is guided without fluttering.

As shown in FIG. 5, even if the sheet material P is further conveyed in the direction E and separated in the direction of the upper guide 15a of the sheet material conveyance guide portion 15, the sheet material P The sheet member P is conveyed in contact with the urging member 12a at the position S2, and the conveyance force of the sheet material P is reduced without causing a resistance that hinders the conveyance force of the conveyance roller 13a of the sheet material conveyance section 13 on the upstream side. I won't let you. This does not affect the case where there is a peripheral speed difference between the upstream sheet material first transport unit 13 and the downstream sheet material second transport unit 14.

The sheet urging member 1 of the sheet urging unit 12
Reference numeral 2a denotes one or a plurality of sheet members provided in the width direction of the sheet member, and arranged so that the position of the sheet member is fixed. The force pulling the support arm 12b of the sheet urging unit 12 in the direction D and the force of the sheet urging member 12a
The first position is set based on a positional relationship, a peripheral speed difference, and the like between the upstream sheet material first transport unit 13 and the downstream sheet material second transport unit 14, and the S1 position and the S2 position of the sheet material urging member 12a.
The positions are set at substantially equal positions.

Even if the sheet material P becomes taut between the upstream sheet material first transporting section 13 and the downstream sheet material second transporting section 14, the sheet material biasing section 12 The sheet material urging member 12a is in contact with the sheet material, so that the length of the chord of the sheet material can be shortened, and the vibration of the sheet material is amplified and no noise is generated.

(Third Embodiment) FIG. 6 shows a third embodiment of the present invention.
Is shown. In the third embodiment, the sheet urging member 12a of the sheet urging unit 12 in the second embodiment is connected to the first sheet conveying unit 13 on the upstream side and the second sheet conveying unit 13 on the downstream side. Guide 15 for guiding the sheet material P between the sections 14
a. Other configurations and operations are the same as those of the second embodiment, so that the same components are denoted by the same reference numerals and description thereof will be omitted.

As shown in the drawing, the peripheral speed difference between the upstream sheet material first transport section 13 and the downstream sheet material second transport section 14
In the case where the difference in the conveying direction and the fluctuation in the tension of the sheet material during the conveyance of the sheet material are small, the sheet material urging unit 22 of the upper guide 15a of the sheet material conveying guide unit 15 shown in FIG. There is the same effect and function as the sheet material urging member 12a of the sheet material urging unit 12 in the embodiment.

Note that any one of the above-described sheet conveying apparatuses can be applied to a known image recording apparatus. That is, since the image recording apparatus is known, the details thereof are omitted, but the image light of the original image is irradiated on the photoconductor to form a latent image on the photoconductor, and then the latent image is developed by a developing device. Thereafter, the transfer device transfers the development onto the sheet material conveyed by any of the above-described sheet material conveyance devices. At this time, the transfer is performed at a predetermined position by adjusting the conveyance timing by the above-described registration roller in order to transfer the development to a predetermined position on the sheet material.

[0046]

According to the present invention, there is provided a sheet conveying apparatus capable of expanding a space for a conveying path according to a conveying state of a sheet conveyed between a first conveying unit and a second conveying unit. By having a guide to hold the position, the sheet material,
It is possible to appropriately hold the transport position according to the state of the transport, and to form a loop between the first transport means and the second transport means and to facilitate jam processing. A large space can be secured and the quality is improved.

The guide member movable in accordance with the bulge of the sheet material conveyed while curving between the first conveying means and the second conveying means to the outside of the curve, while securing a large space, Can guide the material.

The guide member is rotatably supported at one end, and biases the curved outer surface of the conveyed sheet material inward while curving the other end, thereby holding the sheet material conveyance position. A sheet material that is conveyed while curving between the first conveying means and the second conveying means. It is possible to prevent the conveying position of the sheet material from being biased inward by the urging member that urges from the inside to the outside of the curve.

The urging member urges the sheet material to be conveyed to the fluctuation of the tension of the conveyed sheet material, thereby preventing fluttering of the sheet material and abrupt change in the conveying direction, thereby preventing generation of noise. , And can be transported in an appropriate transport direction.

Further, the sheet conveying apparatus having the above-mentioned excellent quality can be applied to the image recording apparatus.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a sheet material conveying device according to a first embodiment of the present invention.

FIG. 2 is a schematic configuration diagram of a sheet material conveying device according to the first embodiment of the present invention.

FIG. 3 is a schematic configuration diagram of a sheet material conveying device according to the first embodiment of the present invention.

FIG. 4 is a schematic configuration diagram of a sheet material conveying device according to a second embodiment of the present invention.

FIG. 5 is a schematic configuration diagram of a sheet material conveying device according to a second embodiment of the present invention.

FIG. 6 is a schematic configuration diagram of a sheet material conveying device according to a third embodiment of the present invention.

FIG. 7 is a schematic configuration diagram of a sheet material conveying device according to a conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sheet material conveyance apparatus 2 Sheet material conveyance guide part 2a Sheet material conveyance guide 3 Sheet material first conveyance part (upstream side) 4 Sheet material second conveyance part (downstream side) 11 Sheet material conveyance apparatus 12 Sheet material urging part 12a Sheet material urging member 13 Sheet material first transport unit (upstream side) 14 Sheet material second transport unit (downstream side) 15 Sheet material transport guide unit

Claims (6)

[Claims] An upstream first conveying means for conveying the sheet material while nipping the sheet material; and a downstream second conveying means for conveying the sheet material conveyed by the first conveying means while nipping the sheet material. In the sheet material transporting device provided with the sheet material, the space for the transport path can be expanded according to the transport state of the sheet material transported between the first transport means and the second transport means. A sheet conveying device comprising a guide for holding a conveying position. 2. The apparatus according to claim 1, wherein said guide is provided between said first transport means and a second transport means.
2. The sheet conveying apparatus according to claim 1, further comprising a guide member that is movable in accordance with a bulge of the sheet conveyed while being curved between the sheet conveying means and the sheet member. 3. The guide member is rotatably supported at one end thereof and guides the sheet conveying position by urging the curved outer surface of the conveyed sheet inward while curving the other end. 3. The sheet conveying apparatus according to claim 2, wherein the sheet conveying device is a member that rotates according to a bulge of the sheet material to the outside of the curve. 4. A guide member for urging a sheet material conveyed while curving between the first conveying means and the second conveying means from the inside to the outside of the curve. The sheet material conveying device according to claim 1, 2, or 3, further comprising: 5. The apparatus according to claim 4, wherein said urging member urges the sheet material conveyed to change in tension of the sheet material.
The sheet material conveying device according to item 1. 6. A latent image means for latently forming an original image on a photoreceptor, a developing means for developing the latent image by the latent image means, and a development developed by the developing means. , 3,
An image recording apparatus, comprising: a transfer unit configured to transfer a sheet material conveyed by the sheet material conveying apparatus according to 4 or 5.