JPS62295843A - Automatic paper feed device for facsimile device - Google Patents

Abstract

PURPOSE:To obtain satisfactory paper draw-in and separating characteristics with a satisfactory balance between right and left friction forces, by providing a rotary support shaft and an arm member for allowing a friction member to make press-contact with a draw-in roller under its weight. CONSTITUTION:A low friction member 8a contributes to an increase in paper draw-in force by a draw-in roller 6, and a high friction member 8b separates one sheet alone from those on feed, that is, it prevents two sheets from being fed at one time. The press-contact load for the friction members 8 is given by the weight of the friction members themselves including an arm member 8d. In other words, a rotary support shaft and the arm member 8d are arranged such that the friction members 8 may be made into press-contact with the roller 6 by the weight of them themselves including the arm member 8d. Further, in order to optimumly regulate the weight of the friction members, there is attached an additional weight 8e.

Description

[Detailed Description of the Invention] 3. Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a facsimile IJJ paper feeding device,
In particular, the present invention relates to an automatic paper feeding device for a facsimile equipped with a gravity friction mechanism suitable for optimizing paper drawing and separation performance.

[Conventional technology]

A conventional facsimile automatic paper feeder, as described in Japanese Patent Application Laid-Open No. 57-21160, includes a pair of upper and lower transport rollers and a pull-in roller, a clutch roller coaxial with the main transport roller, and a clutch roller coaxial with the main transport roller. It was composed of a separation roller in contact with the roller and located on top of the retraction roller.

In this mechanism, the separation roller connects the clutch roller and the pull-in roller through contact, and the difference between the frictional force of the clutch part and the paper-to-sheet frictional force of the pull-in roller part separates multiple sheets of the original to be sent into one sheet. This made it possible to send them.

However, this mechanism has a complex and precise structure, so there are limits to how simple the structure can be.

Another method of the prior art uses a friction body that performs the functions of the clutch roller and separation roller of the above-mentioned method.

This device has a structure in which a friction body, which is formed by laminating a low-friction body such as a spring material and a high-friction body such as rubber in a sand-inch shape, is pressed against the top of a retraction roller using the elastic force of the spring material. It has become.

The paper fed between the friction body and the drawing roller is drawn in at the low friction part and braked at the high friction part.

When multiple sheets of paper are fed, the friction between the sheets is high Jf! Only one sheet, which is below the braking force of the friction section and in contact with the pull-in roller, is separated and conveyed.

Regarding this kind of technology, see Masakazu Ishikawa and Michihisa Iro:
"Influence of Environmental Conditions on Error Rate of Automatic Paper Feeding" 2, Proceedings of the Institute of Image Electronics Engineers (1983), Chikara Yuze et al.: "Study of automatic facsimile paper feeding mechanism", Precision Machinery Vol. 50, No. 5 (1)
(published in May 1984), Keiji Tsuchiya, Etsuo Suzuki: "Facsimile" 2 Mechanical Design Vol. 28, No. 1 (published in January 1984), etc.

[Problem that the invention seeks to solve]

In the conventional facsimile automatic paper feeding device using the friction body described above, the pressure force of the friction body is applied by the amount of deflection of the spring material.

In this device, the rigid bone mounting requires structure and
The structure becomes complicated. Therefore, there was a starting point in terms of ease of assembly and maintenance.

Furthermore, due to variations in the rigidity of the structure and the amount of deflection of the spring material when mounting the spring, a difference occurs in the frictional force between the left and right contact portions, causing the paper conveyance direction to deviate from side to side. It was prone to the so-called skew phenomenon and was difficult to adjust.

The present invention has been made in order to solve the problems of the prior art described above, and it provides the pressing force of the friction body by gravity, achieves a good balance between the left and right frictional forces, and also achieves a good paper draw-in (2). The purpose of this invention is to provide an automatic paper feeder for facsimile machines that can achieve separation performance.

[Means for solving problems]

In order to achieve the above object, an automatic paper feeder for a facsimile according to the present invention is provided with a pair of upper and lower conveyance rollers and a retracting roller, and at least a low friction body and a high friction body are disposed on the upper part of the retracting roller. In a facsimile self-a paper feeding device including a friction body formed by laminating layers, a rotary shaft and an arm member are provided for pressing the friction body against the drawing roller by the friction body's own weight; Further, an additional mass is provided for adjusting the weight of the friction body.

As an additional note, the purpose of the above, especially the purpose of achieving a good balance between the left and right frictional forces, is to provide an arm on the friction body in contact with the upper part of the retraction roller, as in the embodiment shown in FIG. 1, which will be described later. This is achieved by rotatably supporting the parts. That is, in this case, the pressing force of the friction body is given by the weight of the arm, and by adjusting this, the optimal pulling force and braking force can be obtained with right and left balance.

It is most rational and the structure is simplest to use the rotation support shaft at one end of the arm as the upper roller support shaft of the pair of upper and lower conveyance rollers.

Further, as a more reliable and stable friction force setting means, a load means, that is, a load mechanism is added which presses the contact portion between the high friction body portion and the drawing roller, as in the embodiment shown in FIG. 4, which will be described later. In this additional load mechanism, the tip of an arm member rotatably attached to the upper roller support shaft presses against the contact portion. In this case, additional mass is also attached to the arm member,
Optimize the pressure contact force.

[Effect]

What is the effect of high friction materials such as rubber on friction materials?

It is characterized in that only one sheet of paper that is in contact with the drawing roller surface is conveyed, and other sheets of paper that are drawn in at the same time are separated by a high friction body.

When the paper on the drawing roller surface is conveyed, the next roller contacting paper is drawn in. Therefore, as disclosed in the known documents of the prior art, the frictional force between two high-friction bodies must be smaller than the pre-rubbing force between the drawing roller and the paper, and larger than the frictional force between one paper and the other. . However, it is difficult to optimize the frictional force between the high-friction body 9 paper and the frictional force between the pull-in roller and the paper based solely on the material, and by adding a low-friction body such as a spring, both forces acting on the paper can be optimized. It is common to provide a difference in frictional force. In this case, the pressure contact force between each member affects the frictional force.

The embodiment shown in FIG. 1, which will be described later, is characterized in that one end of the friction body is rotatably attached to the support shaft of the upper conveyance roller via an arm portion, that is, an arm member. This is because there is no need to provide a separate member to attach the friction body, the structure is simple and compact, and the handleability is improved. In addition, since the pressing force of the friction body is applied by gravity, it is resistant to aging, and stable friction force with little variation can be obtained with almost no adjustment.

On the other hand, in the embodiment shown in FIG. 4, which will be described later, there is provided a first load means that mainly acts as a low-friction body pressing force, and a second load means that acts as a high-friction body press-contact force.

The weight of the friction body including the arms of the first load means and the additional mass acts as approximately 100% low friction body pressing force. Therefore, by adjusting the weight of the front rubbing member, the pulling force against the fed paper can be adjusted.

Next, the paper separation force can be adjusted by adjusting the load of the second loading means. Therefore, by adjusting the two masses, the retracting force and the braking force (separation blade) can be balanced.

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 1 to 6.

First, FIG. 1 is a schematic side view of an automatic paper feeder for a facsimile according to an embodiment of the present invention, and FIG. 2 is a view of the upper conveyance roller and friction body of the device shown in FIG. 1 from above. FIG.

The friction body shown in Figure 2 shows details of the friction body on the left side;
On the right, the installation of additional masses is shown.

In FIGS. 1 and 2, 1 is a drive motor, 2 is a reduction gear that meshes with a pinion of the drive motor, and 3 is a belt that transmits the rotational force of this reduction gear 2.

4a is a lower conveyance roller, and 4b is an upper conveyance roller, which constitute a pair of upper and lower conveyance rollers 4.

Similarly, 5a is a lower conveyance roller, 5b is an upper conveyance roller,
These constitute a pair of upper and lower conveyance rollers 5. That is, the rotation of the drive motor 1 is transmitted to a pair of upper and lower rollers 4 and 5 via a reduction gear 2 and a belt 3.

6 is a pull-in roller; 7 is a connection gear for transmitting rotation from the lower conveyance roller 5a to the pull-in roller 6.

Reference numeral 8 denotes a friction body, and a part of the friction body 8 contacts the upper part of the pull-in roller 6, and the other end is rotatably attached to the upper roller support shaft 9 of the upper conveyance roller 5b via an arm portion, that is, an arm member 8d. has been done.

The friction body 8 consists of a low friction body 8a made of a spring material placed on the bottom, a high friction body 8b made of a rubber material stacked on top of the low friction body 8a, and a pressing spring 8c stacked on top of the low friction body 8a.
It is formed by laminating a high friction body 8b and a high friction body 8b.

As mentioned above, the low friction body 8a contributes to increasing the paper pulling force on the pulling roller 6, and the high friction body 8b separates only one sheet of the multiple sheets of paper being fed, so-called two sheets. It acts to prevent paper feeding.

The friction force of these friction bodies depends on the load that produces the pressure contact force (hereinafter referred to as pressure contact load).

In this embodiment, the pressure contact load of the friction body 8 is applied by the friction body's own weight including the arm member 8d. In other words, the rotation support shaft and the arm member 8d are provided so that the friction body 8 is compressed by the pull-in roller 6 by the friction body's own weight including the arm member 8d. Furthermore, in order to optimally adjust this frictional dead weight, an additional mass of 8
I am trying to install e.

According to this embodiment, the friction body 8 in contact with the upper part of the pull-in roller 6 is rotatably attached to the upper roller support shaft 9 of the upper conveyance roller 5b via the arm member 8d. does not require any parts, has a simple structure, is small, and is easy to handle.

In addition, since the pressure load of the friction body 8 on the retracting roller 6 is given by the friction body's own weight, the friction force can be stably applied without any adjustment with little variation, and there is little change in the pressure load due to aging. This has the effect of realizing high reliability of the automatic paper feeder.

Next, FIG. 3 is a plan view of a friction body portion of an automatic paper feeder for a facsimile according to another embodiment of the present invention. In the figure,
Components with the same reference numerals as those in FIG. 2 are the same parts as in the embodiments shown in FIGS. 1 and 2, so their explanation will be omitted.

The embodiment shown in FIG. 3 differs from the embodiments shown in FIGS. 1 and 2 in that the rotation support shaft of the friction body 8' is not shared with the upper roller support shaft 9', and the rotation support shaft 11 for the friction body is used instead. This is a new feature.

In the embodiment shown in FIG. 3, the number of parts of the rotating shaft 11 is increased compared to the embodiments shown in FIGS. 1 and 2, making it more complicated. This is exactly the same as the embodiment.

Conventional friction bodies have a structure that applies pressure contact force using spring deflection force, and therefore require high rigidity of the member and high precision for mounting.However, in the rotating support shaft 11 of this embodiment, the pressure contact force is applied by gravity. Since the rotation support shaft 11 can be fixed, the mounting of the rotating support shaft 11 does not require relatively high precision, and has the advantage of being able to have a simple structure.

In the embodiment shown in FIG. 1 above, the friction body 8 is a low friction body 8a.
, a high friction body 8b, and 8c was a pressing spring. This is because the friction body 8 has two pressure contact points with the retracting roller 6, one being a low friction body and the other being a high friction body.

The rate at which the weight of the friction body acts on these press contact points depends on the spring constant and initial deflection amount of the low friction body 8a and the spring presser 8c.

Although the embodiment shown in FIG. 1 can also achieve the performance of pulling in and separating the paper 10 as described above, an embodiment will be described below in which a more reliable and stable frictional force setting means is taken into consideration.

FIG. 4 is a schematic side view of an automatic paper feeding device for a facsimile according to still another embodiment of the present invention, and FIG. 5 is a plan view of the upper conveying roller and friction body of the device shown in FIG. 4 viewed from above. It is a diagram.

The friction body shown in Fig. 5 mainly consists of a friction body and a second friction body on the left side.
The first adding means is shown on the right side.

In FIGS. 4 and 5, parts having the same reference numerals as those in FIGS. 1 and 2 are the same parts as in the embodiment shown in FIGS.

In the embodiment shown in FIG. 4, the friction body 8A is formed by laminating a low friction body 8a made of a metal spring material, a high 17 friction body 8b made of a rubber material, and a guide 8f, and the guide 8f is attached to an arm member 8d. It is configured in a mounted form. Guide 8
As shown in FIG. 4, f is brought into contact with a range from the upper end to the center of the high friction body 8a and low friction body 8b, and functions as a guide member for attaching the friction body.

The contact points between the low friction body 8a, the high friction body 8b, and the retracting roller 6 are given by A and B in FIG. 2, and the two are slightly shifted. Contact point A is the pull-in point, and contact point B is the minute point. In this state, almost no pressing force is generated at the contact point B, so a means for pressing the contact point B is required.

Therefore, an arm member 8d and an additional mass 8e, which are the same as those described earlier in the embodiment shown in FIG. An arm member 12 is provided for pressing the contact portion, that is, the contact point B. Although the rotational support shaft of the arm member 12 is not particularly limited, it is used here as the upper roller support shaft 9 in order to simplify the structure. 12
a is an additional mass, and by adjusting this, an appropriate value of the pressing force of the high friction body 8b at the contact point B can be obtained.

The operation of the facsimile self-tb paper feeding device constructed in this way will be described below.

The paper 10 of the transmission document fed between the friction body 8A and the pull-in roller 6 is pulled in at the contact point A.

Since the frictional force between the low friction body 8a and the paper 10 is not necessarily greater than the friction between the sheets, two or more sheets are conveyed to the contact point B here. At the contact point B, only the document that is in close contact with the pull-in roller 6 is separated and conveyed while being blocked by the high-friction body 8b. In the case of one document, it is transported by the difference between the pulling roller friction force and the high friction body braking force.

In general, the frictional force between sheets varies greatly depending on the paper quality, so the adjustment between the pulling force and the braking force (separation force) is delicate, and highly reliable automatic paper feeding is required for all documents being transported. It is necessary to take into account jams and wrinkles in the thin paper. In this respect, according to the automatic paper feeder of this embodiment, both the retracting force at the contact point A and the braking force at the other side of the contact point can be finely adjusted independently.

A highly reliable device can be provided.

Next, still another embodiment of the present invention will be described with reference to FIG.

FIG. 6 is a schematic side view of an automatic paper feeder for a facsimile according to still another embodiment of the present invention, in which the same reference numerals as those in FIG. 4 refer to parts equivalent to those in the embodiment of FIG. Therefore, its explanation will be omitted.

The embodiment shown in FIG. 6 has a stopper 13 added to the embodiment shown in FIG.

The stopper 13 is fixed on the high friction body 8b of the friction body 8B at a position where it should come into contact with the arm member 12, and the high friction body 8b is retracted by the frictional force at the contact point B, thereby reducing the low friction. This is provided to prevent the pressure contact force at the contact point A of the body 8a from being affected. That is, by providing the stopper 13, the frictional force of the high-91 friction body 8b and the frictional force of the low-frictional body 8a can be applied independently with their respective pressing loads.

According to the embodiment shown in FIG. 6, the same effects as those of the above-mentioned embodiments can be expected, and the optimum distribution of the paper pulling force by the low friction body 8a and the paper separation force by the high friction body 8b can be easily achieved. be able to.

〔Effect of the invention〕

As described above, according to this embodiment, the pressing force of the friction body is applied by gravity to obtain a good balance between the left and right frictional forces, and an automatic facsimile machine capable of obtaining good paper drawing and separation performance. A paper feeding device can be provided.

[Brief explanation of drawings]

FIG. 1 is a schematic side view of an automatic paper feeding device for a facsimile according to an embodiment of the present invention, and FIG. 2 is a plan view of the upper conveyance roller and friction body of the device shown in FIG. 1, viewed from above. FIG. 3 is a plan view of a friction body portion of an automatic paper feeder for a facsimile according to another embodiment of the present invention, and FIG. 4 is a plan view of an automatic paper feeder for a facsimile according to still another embodiment of the present invention. FIG. 5 is a schematic side view, and FIG. 5 is a plan view of the upper conveyance roller and friction body of the apparatus shown in FIG. 4, seen from above. FIG. FIG. 2 is a schematic side view of the device. 5... Conveyance roller, 5b... Upper conveyance roller, 6...
・Retraction roller, 8.8', 8A, 8B=-・Friction body, 8a...Low friction body, 8b...High friction body, 8d, 8
'd...Arm member, 8e...Additional mass, 9...
・Upper roller support shaft, 11...Rotation support shaft, 12...Arm member, 12a...attached No. 1 Fig. 9--Yo-ra japanese cedar Fig. 3 Fig. 4z

Claims (1)

[Claims] 1. An automatic facsimile machine comprising a pair of upper and lower transport rollers and a pull-in roller, and a friction body formed by laminating at least a low-friction body and a high-friction body on the top of the pull-in roller. In the feeding device, a rotation support shaft and an arm member are provided for pressing the friction body against the retraction roller by the friction body's own weight, and an additional mass is provided on the arm member for adjusting the friction body’s own weight. An automatic paper feeder for a facsimile machine, which is characterized by: 2. In the item described in claim 1, the rotation support shaft of the friction body has a load means on the support shaft for pressing the contact portion between the high friction body portion of the friction body and the retraction roller. The facsimile's automatic paper feeder is installed. 3. An automatic paper feeding device for a facsimile according to any one of claims 1 and 2, wherein the rotational support shaft of the friction body is coaxial with the upper roller support shaft of the conveyance roller. 4. An automatic paper feeder for a facsimile according to claim 2, wherein the load means is an arm member, and an additional mass for adjusting the load is provided on the arm member. 5. An automatic paper feeder for a facsimile according to any one of claims 2 and 4, wherein the high friction body portion is provided with a stopper that comes into contact with an arm member related to the load means. Device.