JPH04112143A - Paper transport roller - Google Patents

Abstract

PURPOSE:To obtain a roller having the high rigidity in the whole of the roller with high precision independently of the dimension of the roller diameter by constituting the inside of the roller body from metal members and covering the outer periphery of the roller surface by a rubber covered layer. CONSTITUTION:A roller core part 22 is made of the high rigidity material such as metal and plastics. Accordingly, the generation of deformation of a paper transport roller 20 is suppressed, and high hardness and high rigidity are provided, and the roller 20 having high precision can be obtained. Since the outer periphery of the roller surface of the roller core part 22 is covered with a rubber covered layer 24 having a high frictional coefficient, and the inside of the roller body 22a is made of the metal material, a paper sheet 30 is surely caught by the roller surface and transported, and the correct paper sheet transport free from the generation of paper skew and paper jam can be carried out.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to a paper transport roller, particularly a paper transport roller that is useful when transporting paper at high speed and with high precision or when transporting paper using large diameter rollers. .

[Prior Art] Conventionally, paper conveyance rollers have been used in paper conveyance mechanisms such as copying machines, printers, and document reading devices.As the amount of information increases in the information society, these various devices are required to perform faster processing. Requests have been made.

In the paper transport mechanism of the above device, for example, two
Two conveyance rollers are arranged facing each other, and by driving the rollers to rotate, the paper is sandwiched between the two rollers, and the paper is conveyed while being fed out by the frictional force of the roller surfaces.

The conventional structure of such paper conveyance rollers is that, for example, a holding mechanism is provided on the rotating shaft of the roller to hold the roller, and a rubber member with a large friction coefficient is formed around the holding mechanism in a roll shape to match the diameter of the roller. Most of the rollers were made of rubber.

[Problems to be Solved by the Invention] As described above, the conventional paper conveyance roller reliably grips the paper and feeds the paper using the rotational force of the roller.
A rubber member with a high coefficient of friction is used, and the rubber member is formed around the rotating shaft according to the diameter of the roller.

Therefore, when the above-mentioned conventional paper transport roller is used as a turn roller that changes the angle of the transport path, the turn roller disposed at the turn position is relatively large in order to smoothly change the angle of the paper at the turn position. diameter roller should be used. However, when the rubber member is made thicker and the roller diameter is increased, rubber with a high coefficient of friction has low rigidity and is easily deformed, so the feeding speed (accuracy) may change depending on the type of paper such as paper quality and paper thickness, and the speed may change during conveyance. There are problems such as paper skew (paper skew) and paper jam (paper jam).

In particular, when transporting paper at high speeds in order to meet the demands for high-speed processing associated with the increase in the amount of information as mentioned above, roller precision must be kept high or the paper skew and paper jams described above may occur. The problem is that it is amplified.

Therefore, it is conceivable to use a rubber member with high rigidity as the rubber member used for the paper conveyance roller to obtain a highly accurate roller that is not easily deformed.

However, hard rubber with high rigidity has a low coefficient of friction on the roller surface, making it easier for the paper to slide against the roller.
This causes similar problems such as paper skew and paper jam.

In addition to the rubber member, the roller accuracy problem also occurs if the holding mechanism itself that holds the roller relative to the rotating shaft is not strong enough to cause the roller to wobble, resulting in a decrease in roller accuracy.
As a result, there is a problem in that the accuracy of paper feeding speed is reduced.

Purpose of the Invention The present invention has been made to solve the above-mentioned problems, and its purpose is to provide a roller with high rigidity and high precision regardless of the roller diameter. Another object of the present invention is to provide a paper transport roller having a roller surface with a high coefficient of friction.

[Means to solve the problem]

In order to solve the above problems, the paper transport roller of the present invention rotates the roller and transports the paper using the frictional force of the roller surface.The center of the main body of the roller is made of a highly rigid member such as metal or plastic. The present invention is characterized in that it includes a roller core portion having a cylindrical shape, and a rubber coating layer in which the outer periphery of the roller surface of the roller core portion is coated with a rubber member having a high coefficient of friction.

Further, in the paper conveyance roller of the present invention, the roller core portion is provided with a through hole that is removably fitted to the rotating shaft, and is integrated with a cylindrical roller portion made of a metal member that extends from the side surface of the roller portion. The present invention is characterized in that it is comprised of a shaped boss portion and a fixing pin that is fitted into a through hole of the boss portion and fixes the roller portion to the rotating shaft.

[Function] According to the paper conveyance roller having the above configuration, by using a highly rigid member such as a highly rigid metal or plastic in the roller core portion, the roller is hard to deform and has high hardness and high rigidity. As a result, a highly accurate roller can be obtained.

The roller core section provides high rigidity, and by coating the outer periphery of the roller surface of the roller core section with a rubber coating layer having a high friction coefficient, the roller surface reliably grips and conveys the paper, thereby preventing paper skew. Paper can be transported accurately and paper jams are unlikely to occur.

In addition, the roller core section is composed of a roller section and a boss section, and the roller is fixed to the rotating shaft by a fixing pin of the boss section, so that the roller can be held securely and wobbling can be prevented.

[Embodiment] A preferred embodiment of a paper conveyance roller to which the present invention is applied will be described below with reference to the drawings.

In this embodiment, the paper transport roller of the present invention is used as a turn roller in a paper transport mechanism of a document reading device that optically reads document information and converts it into digital data.

Of course, the embodiment described below shows an example of the present invention, and the present invention is not limited only to this embodiment.

FIG. 3 shows an overall configuration diagram of a document reading device according to an embodiment of the present invention.

The illustrated device has a horizontal suction/vertical exhaust bus which is further divided in flow order into a supply path, a read path and an exhaust path.

In order to realize the above-mentioned path, the apparatus has a single drive motor, and is equipped with a sheet conveying mechanism that applies document feeding force to the above-mentioned path through the driving force of this motor through a gear train and a pulley.

Furthermore, the device of this embodiment provides a device that can read both sides of a document at the same time, and a first light source and a second light source are arranged on both sides of the reading path, respectively, as will be described later. A first reading block and a second reading block are respectively arranged.

First, the structure of the document path will be explained.

A supply tray 12 protrudes from the outside of the device case 10, and as will be described later, documents to be read can be stored on this tray 12.
Stocked on top. A feed roller 14 and a retard roller 16 are disposed close to the tray 12 and vertically opposed to each other, and only the topmost sheet of the stocked documents is sucked into the supply path from the direction of the outlined arrow A.

For this purpose, the feed roller 14 is moved counterclockwise in the figure.
Then, the retard roller 16 is also driven to rotate counterclockwise, and the feed roller 14 pulls the top paper in the suction direction, and the documents stocked below are pushed back to the tray 12 side by the retard roller 16, so that the paper is effectively Paper handling is being done.

Following the feed roller 14, the feed path has a horizontal feed belt 18 which transports the document to the next turn roller 20.
send to.

the turn roller 20 forms the rearmost part of the supply bus;
It is responsible for moving the document from a horizontal path to a vertical path. For this reason, as shown in FIG. 3, the turn roller 20 is a roller with a relatively large diameter.

The turn roller 20 employs the paper conveyance roller of the present invention as shown in FIGS. 1 and 2. below,
The structure of the turn roller will be explained in detail.

As shown in FIG. 1, the turn roller of this embodiment has the following features:
It is composed of a roller core portion 22 and a rubber coating layer 24.

The roller core portion 22 is a cylindrical roller portion 22a provided with a through hole 28 that is removably fitted to the rotating shaft 26.
and a boss portion 22b that is integrally integrated with the side surface of the roller portion 22a in the rotation axis direction, and a screw-type fixing pin 22c is fitted into the boss portion 22b toward the through hole 28. ing. Each of these parts is made of iron.
It is made of highly rigid materials such as aluminum and plastic.

The rubber coating layer 24 is made by thinly coating the outer periphery of the roller surface of the roller portion 22a with rubber having a high coefficient of friction. The method for forming the rubber coating layer 24 is to place the roller part 22a in a mold slightly larger than the roller diameter, pour rubber into the gap between the mold and the roller part, mold it, and then rotate the roller. However, it was milled and polished to the desired diameter. Of course, the method for forming the rubber coating layer is not limited to the above method, and various methods may be employed.

Then, the roller core part 22 and the rubber coating layer 2 as described above are assembled.
The rollers can be reliably fixed to the rotation shaft by sequentially fitting a plurality of paper conveyance rollers consisting of 4 to the rotation shaft 26 and tightening the fixing pin 22c at a predetermined position. In this way, by fixing a plurality of rollers at equal intervals to one rotating shaft 26, it is possible to form a turn roller 20 having a desired diameter and a desired width as shown in FIG. can.

The turn roller of this embodiment is characterized by high hardness and high rigidity because the inside of the main body is composed of a metal roller.
A highly accurate roller without deformation or size variation can be obtained. Then, as shown in FIG.
The outer periphery of the roller portion 22a with the roller in contact with the roller is thinly covered with a rubber coating layer 24 having a high coefficient of friction.
It is now possible to reliably grip the paper 30 and transport it accurately as the rollers rotate. In addition, the bore part 2
Since the individual rollers are fastened and fixed to the rotating shaft 26 by the fixing pins 22c provided on the rollers 2b, the rollers are securely held to the rotating shaft 26 and no wobbling occurs.

Therefore, even when paper is conveyed at high speed, it is now possible to prevent paper jams and paper skews from occurring due to deformation or wobbling of the rollers or a decrease in the coefficient of friction.

The turn roller 20 described above rotates the paper 30 in the direction of the arrow C of the turn roller 20, as shown in FIG. move it to another space.

The document transferred to the vertical pass is sent to the next reading pass, as shown in FIG. In this embodiment, this reading path includes a first aperture plate 32, a second aperture plate 34, and as the document passes between both aperture plates 32, 34, a predetermined reading action is performed. .

After passing through the reading path, the document is then sent to the ejection path. The documents discharged from the discharge path in the direction of the outlined arrow B are sequentially stocked in a stocker 36 outside the apparatus.

Sensors are arranged along the document bus in order to monitor whether a document path is formed as described above, or whether documents are being sucked into the document bus and reliably ejected.

In some embodiments, the incoming document sensor 38 is connected to the feed belt 18
It consists of an optical sensor including a light emitter and a light receiver.

The irradiation light of this sensor 38 is irradiated upward across the document bus, and a reflector 40 is provided above the document bus at this irradiation position.

Therefore, when there is no document on the supply path, the incoming document sensor 38 receives the reflected light from the reflector 40;
On the other hand, when a document is sucked into the supply bus, the irradiation light is blocked by the document, so that the entry of the document can be detected.

Furthermore, by detecting the document glue edge, the incoming document sensor 38 can instruct the timing at which the document reaches a reading position, which will be described later, based on the feeding speed of the document bus.

Next, the structure of the document reading section will be explained.

Approximately central portions of both aperture plates 32, 34 form first and second reading positions, respectively.

Light sources 42 and 44 are provided to irradiate predetermined irradiation light to both reading positions, and irradiate light toward the reading positions as shown by the chain lines in the figure.

Both of the above-mentioned irradiation lights are reflected on the document surface to generate reflected light according to the brightness thereof, and the reflected light as shown by the chain line in the figure is guided to a reading block to be described later.

In order to read the reflected light on the front side of the document, the device is provided with a reading block 46, 48.

That is, the first reading block 46 includes a lens system 50, and the reflected light from the first reading position is transmitted through the lens system 50.
0 and enters the light receiving section 52 for each line.
2, the line is read.

On the other hand, the second reading block 48 has almost the same structure as the first reading block 46, and has a lens system 54 and a light receiving section 56 inside, and the reflected light from the second reading position is transmitted through the lens. The light passes through the system 54 and enters the light receiving section 56 .

As described above, the structure of the document bus and reading device of this embodiment is understood, and the operation during document reading will be briefly explained below.

Of the documents stacked on the tray 12, only the top paper is sucked into the document bus from the feed roller 14, and the documents below are separated by the retard roller 16.
As a result, documents are sequentially fed into the document bus one by one.

When the document reaches the incoming document sensor 38, the sensor 3
8 detects the suction of a document and supplies a signal to a controller (not shown). The controller starts each reading block 46 by giving a predetermined delay time based on the length from the sensor 38 to the reading position, which is known in advance, and the document feeding speed.
．． 48 reading start commands are awaited.

When the document reaches the reading position, the reading block 46 is read from one or both of the front and back sides as necessary.
48 captures the desired reflection data and stores it.

Of course, it is also possible to have the controller read only the necessary positions within the document by trimming the reading positions within the document.

The document whose required document surface has been read is discharged from the discharge bus to the stocker 46 outside the apparatus, and continuous document reading is automatically performed.

As described above, the paper conveyance roller in the document reading device of this embodiment includes a roller core portion in which the inside of the main body of the roller is made of a metal member, and the roller is fixed to the rotating shaft through a fixing pin in the bore portion. Since the outer periphery of the roller surface of the roller core portion is thinly covered with a rubber coating layer, even a turn roller with a large diameter can be made into a paper conveyance roller with high precision and a high coefficient of friction.

[Effects of the Invention] As explained above, the paper conveyance roller of the present invention has a metal member inside the roller body and a rubber coating layer covering the outer periphery of the roller surface, so that the paper conveyance roller of the present invention can be used regardless of the size of the roller diameter. A roller with high overall rigidity and high precision can be obtained, and the friction coefficient of the roller surface can also be increased.

Therefore, even if the paper is transported at high speed, the paper can be transported accurately and reliably, making it possible to prevent vapor skew and paper jams.

[Brief explanation of drawings]

FIG. 1 is an assembled perspective view of a paper conveyance roller according to an embodiment of the present invention, FIG. 2 is a plan view of a turn roller, and FIG. 3 is an overall fR diagram of a document reading device according to an embodiment of the present invention. be. 22...Roller core part 22a...Roller part 22b...Boss part 22c...Fixing pin 24...Rubber coating layer 26...Rotating shaft 28...Through hole 30.308...Paper

Claims (2)

[Claims] (1) In a paper transport roller that rotates the roller and transports the paper using the frictional force of the roller surface, the main body center of the roller includes a roller core portion made of a highly rigid member such as metal or plastic, and the roller core portion. A paper conveyance roller comprising: a rubber coating layer in which the outer periphery of the roller surface is coated with a rubber member having a high friction coefficient; (2) The paper conveyance roller according to claim 1, wherein the roller core portion is a cylindrical roller portion made of a highly rigid member such as metal or plastic, and includes a through hole that is removably fitted to the rotating shaft. A sheet of paper characterized in that it is composed of a boss part that extends and is integrated with the side surface of the roller part, and a fixing pin that is fitted into a through hole of the boss part and fixes the roller part to the rotating shaft. Conveyance roller.