JPH02138042A - Sheet supply device - Google Patents

Abstract

PURPOSE:To positively handle plural sheet materials to prevent generation of jamming by providing a stepped part on a guide of the sheet materials to handle the sheet materials in two steps for a long period of time by means of the stepped part and a separating piece provided on the downstream side of the stepped part. CONSTITUTION:A sheet material nipped between a sheet supplying roller 4 and a document presser plate 5 is guided to guide to a guide 6 formed by an upper guide 60 and a lower guide 61 arranged vertically on the opposite sides and slightly tilted downward in the direction of feed, and sent to between a handling roller 7 provided on the downstream side of the sheet supplying roller 4 and a separating piece 8 oppositely arranged on the underside of the handling roller. In this instance, plural sheet materials are handled by a stepped part 62 provided in the middle of the lower guide 61 and the separating piece 8, and one of the sheet materials is sent to a pair of upper and lower conveying rollers 9 provided on the downstream side of the handling roller 7.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a paper feeding device that is installed in a facsimile machine, a copying machine, etc., and that separates and conveys a large number of sheet-like originals set one by one.

One conventional example of this type of paper feeding device (hereinafter referred to as the first conventional example)
There is one shown in Fig. 5. This paper feeding device is so-called a reverse-handling paper feeding device.
A pair of upper and lower rollers 20a, 20b, 21a on the upper and downstream sides
, 21b, respectively, and the upstream roller pair 20a, 20
A pair of rollers 21a and 21b on the downstream side handle a large number of sheet-like originals (hereinafter referred to as sheet materials) caught between the rollers 21a and 21b.
The structure is such that the paper is conveyed one by one.

Specifically, the relationship between the rotational torque of the rollers 20a and 20b, the frictional force between them, and the frictional force between the rollers 20a or 20b and the sheet material is appropriately set, and the lowermost sheet material is conveyed to the downstream side. , the upper sheet material is returned to the upstream side, and the sheet materials are conveyed one by one. The rollers 20a, 20b, 21a, and 21b are rotated by a motor 22, and the roller 20a is connected to a torque limiter 23, and the roller 20b is connected to an electromagnetic clutch 25 via a one-way clutch 24.

FIG. 6 shows another conventional example (hereinafter referred to as the second conventional example).

This paper feeding device is so-called a paper feeding device of a separation sheet handling method, and includes a roller 26 and a presser plate (plate spring).
A large number of sheet materials S are set between rollers 26 and 27.
The paper is separated by a separating piece 28 of temporary rubber or the like provided below, and transported one by one to the downstream side. Furthermore, reference numeral 29 denotes a separation piece presser plate spring that presses the separation piece 28 against the roller 26 side with elastic force, and the structure is such that the elastic force between this and the presser plate 27 is appropriately set to ensure reliable separation. It has become.

However, in the case of the first conventional example, the motor 22,
Since a drive system such as a one-way clutch 24 and an electromagnetic clutch 25 and a torque limiter 23 are required, the device configuration is complicated, large-sized, and expensive.

Further, in the case of the second conventional example, the mechanism makes it difficult to continuously convey a large number of sheet materials S, and the number of sheets is limited to about 10, which is a drawback. That is,
In order to press a large number of sheet materials S against the roller 26, it is necessary to set the pressing force of the presser plate 27 as strong as possible; however, in this case, the force for feeding the sheet materials S to the separation piece 28 becomes strong. In response to this, the pressing force of the separation piece pressing plate spring 29 must be set to a strong force, and as a result, it becomes difficult to reliably convey one sheet material S.
This means that the number of sheet materials S that can be conveyed at one time is limited.

The present invention was made in order to eliminate the drawbacks of the prior art, and an object of the present invention is to provide a paper feeding device that can reliably convey a large number of sheets with a simple structure.

In order to do this, the present invention has a paper feed roller section in which a paper feed roller and a presser plate are arranged facing each other, and a separating roller section in which a separation piece made of an elastic material and a separating roller are arranged in opposition on the upper and downstream sides. In a paper feeding device that separates a large number of sheets and conveys them one by one, a guide having a stepped portion and a conveying interval narrowing toward the downstream side is provided between the paper feeding roller portion and the separating roller portion. It is characterized by the fact that it is set in

Production-U In such a case, as the sheet material is transported downstream, the transport interval between the guides becomes narrower, so that a part of the sheet material is separated at this portion.

Disaster - Resurrection Embodiments of the present invention will be specifically described below based on the drawings.

Fig. 1 is a partially cutaway side sectional view of a facsimile machine equipped with a paper feeding device according to the present invention, Fig. 2 is an enlarged side sectional view of the main part, and Fig. 3 shows the conveyance state of sheet material. FIG. 3 is an enlarged side cross-sectional view of main parts.

First, the schematic structure of a facsimile machine will be explained with reference to FIG. When a large number of sheets S (see Fig. 3) are set on the document set tray 2 provided on the upper right side of the apparatus main body 1, the document set detection sensor detects this state and the motor (none of which is shown) is activated. When the paper feed roller 4 is rotated, the leading ends of a large number of sheets S are caught between the paper feed roller 4 and a presser plate (plate spring) 5 provided below it. Note that a regulating plate 3 for guiding the feeding of the sheet material S is provided between the paper feed roller 4 and the document feed tray 2.

The sheet material S caught between the paper feed roller 4 and the document holding plate 5 is moved to the guide 6, which is composed of an upper guide 60 and a lower guide 61, which are arranged vertically facing each other in a downward slope in the feeding direction. The sheet is guided and sent between a sorting roller 7 provided on the downstream side of the paper feed roller 4 and a separation piece 8 disposed oppositely below the sorting roller 7.

At this time, as will be described later, a large number of sheet materials S are connected to a stepped portion 62 provided in the middle of the lower guide 61 and a separating piece 8.
The - sheets of sheet material S are separated by the separation roller 7.
The paper is sent to a pair of upper and lower transport rollers 9 provided on the downstream side. Note that the guide 6 is provided from the upstream side of the paper feed roller 4 to the downstream side of the transport roller pair 9 as shown in the figure.

The sheet material S conveyed downstream by the pair of conveyance rollers 9 is then conveyed by the reading roller 10 provided at the reading position. The image is read, and the read original image is transmitted to the destination facsimile machine via a transmission control circuit (not shown). Then, the read sheet material S is sent to a pair of upper and lower discharge rollers 12, from which it is discharged outside the machine.

Next, details of the paper feeding device will be explained with reference to FIGS. 2 and 3. As shown in FIG. 2, the upper guide 60 and the lower guide 61 are formed by bending a plate material of the same width, and the corresponding parts are punched out. The paper feeding roller 4, pressing plate 5, sorting roller 7, and part of the separating piece 8 are inserted between the upper and lower guides 60 and 61 through the punched parts 60a and 61a. Note that the downstream ends of the punched parts 60a and 61a remain slightly, and these remaining parts 60b and 61b
is cut and raised outward to guide the movement of the sheet material S conveyed between the upper and lower guides 60 and 61.

The stepped portion 62 is formed at the end of the punched portion 61a located upstream of the lower guide 61, and its shape is as shown in FIG. 2.

That is, the corresponding part of the lower guide 61 is turned outward 90
It is bent by about 6 to 120 degrees, and formed so that the upper end of the stepped portion 62 and the punched portion 61a form an angle of 90° to 120°. Also, regarding the interval between the upper and lower guides 60.61, the distance between the paper feed roller 4 and the separating roller 7 is 1 to 2.
The distance between the punched parts 60a to 613 on the upstream side is set to about 1Q mm.

When the inclination of the stepped portion 62 is set to 90° to 1200° as described above, the sheet material S can overcome the stepped portion 62, so that conveyance of the sheet material S is not hindered. Moreover, since the conveyance interval is narrowed from 1 On to 1 to 2 fl, it is possible to exhibit a sorting effect.

As shown in the figure, the upstream ends of the presser plate 5 and the separation piece 8 are fixed to the device main body 1, so that both of them function as a leaf spring. Further, as for the material of the separation piece 8, temporary rubber is preferable.

Thus, as shown in FIG. 3, when a large number of sheets (approximately 30 to 50 sheets) of material S are set on the paper feed roller 4, the tip of the presser plate 5 is bent downward, and is held by a predetermined spring pressure. The sheet material S is pressed against the paper feed roller 4, and thus a large number of sheet materials S are conveyed downstream. At this time, the leading end of the sheet material S comes into contact with the stepped portion 62, which functions as a regulating guide for the sheet material S, allowing only the upper few sheet materials S to be conveyed. .

Next, the tip of the separating piece 8 into which the remaining few sheet materials S are fed is bent by the thickness of these pieces, and the spring pressure at that time presses the sheet material S against the sorting roller 7, and the friction generated at this time is The force ensures that the uppermost sheet material S is separated from the other sheet materials S and transported downstream. That is, in the present invention, a configuration is adopted in which a large number of sheet materials S are separated in two stages using the stepped portion 62 and the separation piece 8.

Therefore, since the burden on each individual is reduced, reliable handling can be expected over a long period of time.

Incidentally, since the stepped portion 62 has a stopper function when the sheet material S is set, there is an advantage that setting work is facilitated.

FIG. 4 is an enlarged side sectional view of a main part showing a modification of the present invention. In this modification, a separating piece 63 made of a flexible member such as a Mylar sheet is attached to the stepped portion 62, and the sheet material S is reliably separated with a more compact structure.

That is, if the separating piece 63 is attached with its upper end protruding from the stepped portion 62 as shown in the figure, the dimension between the upper and lower guides 60 and 61 on the downstream side, that is, the conveyance interval will be further narrowed. Therefore, the handling action on the upstream side can be improved. Therefore, since the load on the downstream side can be reduced, the paper feed roller 4
The distance between the filter and the sorting roller 7 can be reduced, and as a result, the configuration can be made compact.

Note that the flexibility of the separating piece 63 does not adversely affect the conveyance of the sheet material S, so a configuration may be adopted in which the upper end of the separating piece 63 is brought into contact with the circumferential surface of the paper feed roller 4.

In the above explanation, the case where the paper feeding device of the present invention is applied to a facsimile machine has been described, but this is not limited to a printer,
The same applies to copying machines and the like.

Since the present invention is configured as described above, it has the following effects.

In the sheet feeding device according to the first aspect, a stepped portion is provided in the sheet material guide, and the sheet material is sorted in two stages using this stepped portion and the separating piece on the downstream side, so that a large number of sheet materials can be separated. It will definitely last for a long time. Therefore, problems such as jamming do not occur.

In addition, since a complicated drive system is not required, the apparatus has the advantage of being compact and simple in structure and reducing costs.

Furthermore, since the stepped portion functions as a stopper when setting the sheet material, there is an advantage that ease of use can be improved.

In addition to the above-mentioned effects, the paper feeding device according to the second aspect of the present invention has the advantage that the device configuration can be partially made more compact.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway side sectional view of a facsimile machine equipped with a paper feeding device according to the present invention, Fig. 2 is an enlarged side sectional view of the main part, and Fig. 3 shows the conveyance state of sheet material. FIG. 3 is an enlarged side cross-sectional view of main parts. FIG. 4 is an enlarged side sectional view of a main part showing a modification of the present invention. FIG. 5 is a schematic side view of a main part showing a first conventional example, and FIG. 6 is a side sectional view of a main part showing a second conventional example. DESCRIPTION OF SYMBOLS 1...Device main body, 4...Paper feed roller, 5...Press plate, 6...Guide, 60...Upper guide, 61...
Lower guide, 62... Step portion, 63... Separating piece, 7
...Separation roller, 8.Separation piece. Figure 1 B

Claims (2)

[Claims] (1) A paper feed roller section in which a paper feed roller and a presser plate are arranged facing each other, and a sorting roller section in which a separating piece made of an elastic material and a sorting roller are arranged in opposition are arranged on the upper and downstream sides, and a large number of sheets are A paper feeding device that separates and conveys sheet materials one by one, characterized in that a guide having a stepped portion and whose conveying interval narrows toward the downstream side is provided between the paper feeding roller portion and the separating roller portion. Paper feeding device. (2) The paper feeding device according to claim 1, wherein a flexible separating piece is attached to the stepped portion.