JPH07206200A - Paper feed device - Google Patents

Abstract

PURPOSE:To provide a paper feed device of which paper sheet regulation by stopper members can be surely performed and the gap of the stopper member can be easily controlled. CONSTITUTION:Stopper members 2 are provided adjacently to both sides of a roller 1, the two stopper members 2 are arranged so as to be right and left symmetrical putting the roller 1 between, and to position at least the extreme end parts 2a in the width territory of the diameter of the roller 1 in the carrying direction of the paper sheet. The relation between the stopper member 2 and the roller l satisfies (r)-R<0, where the radius of the roller 1 is R, and the length of the perpendicular from the end part 2a of the stopper member 2 to the straight line L in the paper sheet carrying direction passing through the center 0 of the roller 1 is (r).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to at least one roller which is driven to rotate in the sheet conveying direction and is in contact with a surface of a stacked sheet to feed the sheet, and a separating member for separating sheets to be fed one by one. And a stopper member for regulating the number of sheets reaching the separating member.

[0002]

2. Description of the Related Art A sheet feeding device of the above type is well known, and is attached to a printer, a copying machine, a facsimile, a printing machine or the like for feeding a transfer sheet or a document. In many cases, the apparatus sequentially feeds paper from the bottom of the stacked sheets. In such a sheet feeding device of the sheet lower feeding method, it is difficult to prevent double feeding only by a separating member such as a separating blade or a friction pad which is brought into contact with a roller. Therefore, a stopper member is provided and the number of sheets reaching the separating member is increased. Are regulated. The regulation of the passing sheet by such a stopper member is an important factor for obtaining the desired regulation of the angle of the stopper member and the gap between the stopper member and the roller or the guide plate.

However, since the management of the gap, which is an important factor, is quite difficult due to the construction of the assembly, etc., it is possible to set the gap somewhat larger by taking into consideration the variations of the parts themselves and the variations between machines. It is being appreciated. That is, in the conventional paper feeding device, in order to regulate the passing paper, the gap between the stopper member and the roller or the guide plate is set to be slightly wider than the intended gap with a margin.

[0004]

However, since the above-mentioned gap is set wide in the conventional paper feeding device,
There is a problem that a device with an excessively wide gap appears, and in such a sheet feeding device, the regulation of the sheet by the stopper member becomes insufficient, so that the function of the separating member deteriorates.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems of the prior art, to provide a sheet feeding device in which the regulation of the sheet by the stopper member can be surely performed and the gap of the stopper member can be easily controlled.

[0006]

In order to achieve the above object, the present invention is provided with at least one roller which is driven to rotate in the sheet conveying direction and which comes into contact with the surface of a stacked sheet to feed it. In a sheet feeding device having a separating member for separating the sheets one by one and a stopper member for regulating the number of sheets reaching the separating member, at least the tip of the stopper member has a width of the diameter of the roller in the sheet conveying direction. In the region and adjacent to the roller, the radius of the roller is R, and the length of a perpendicular line from the tip of the stopper member to a straight line in the sheet conveying direction passing through the center of the roller is r. So that r-R <0 is satisfied,
It is characterized in that the stopper member is provided.

Further, in order to achieve the above object, according to the present invention, when the distance from the roller end surface in the axial direction of the roller to the stopper member is a and the width in the axial direction of the roller is c, a and c , R, r are a = c / A,
However, A = 4 to 6 and a = (R−r) × B, where B
It is characterized by satisfying the relationship of 5 to 35.

[0008]

According to the above construction, at least the tip of the stopper member is arranged within the width region of the diameter of the roller in the sheet conveying direction and adjacent to the roller, the radius of the roller is R, and the tip of the stopper member is Since the stopper member is provided so as to satisfy r−R <0, where r is the length of a perpendicular line from the portion to the center of the roller in the sheet conveying direction, the stopper member and the roller are separated from each other. The discrepancy occurs and the number of sheets on the downstream side of the stopper member in the sheet conveying direction can be reliably regulated.

[0009]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a front explanatory view showing a part of a paper feeding device according to the present invention, and FIG. 2 is a side explanatory view thereof.

In FIGS. 1 and 2, reference numeral 1 is a roller which is rotationally driven in the sheet conveying direction shown by the arrow in FIG. 2, 2 is a stopper member, and 3 is a lower guide plate. As shown in FIG. 1, the stopper members 2 of the present embodiment are provided adjacent to both sides of the roller 1, and the two stopper members 2 are symmetrically arranged with the roller 1 interposed therebetween. Further, the stopper member 2 is arranged such that at least the front end portion 2a thereof is positioned within the width region of the diameter of the roller 1 in the sheet conveying direction. As shown in FIG. 2, the relationship between the stopper member 2 and the roller 1 is a perpendicular line from the radius of the roller 1 to the straight line L in the sheet conveying direction passing from the tip 2a of the stopper member 2 to the center O of the roller 1. Let r be the length of
r-R <0 is satisfied. That is, the stopper member 2 is arranged with respect to the roller 1 so that the end portion 2a of the stopper member 2 is located below the uppermost position on the circumferential surface of the roller 1, and the stopper member 2 and the roller 1 are in a disagreement state. .

The sheet feeding device having the above-described structure is provided with the stopper member 2
Is provided in a state of being inconsistent with the roller 1, the regulation of the number of sheets reaching the separating member (not shown in FIGS. 1 and 2) provided on the downstream side of the stopper member 2 in the sheet conveying direction is surely performed. You can do it.

The stopper member 2 can be arranged at any position on the roller 1 upstream of the separating member in the sheet conveying direction. Therefore, as shown in FIG. 3, the stopper member 2 may be provided on the separation roller 11 on which the separation blade 4 as a separation member is in contact, or as shown in FIG. It may be provided on the pickup roller 21 provided on the upstream side in the direction.

By the way, since the stopper member 2 and the roller 1 are in a staggered state, the sheet passing between the stopper member 2 and the roller 1 is corrugated as shown in FIG. As for the positional relationship between the stopper member 2 and the roller 1 such as the gap, if the gap is made too small, a wavy angle is formed on the paper P, and problems such as non-feeding may occur in some cases. Therefore, it is necessary to preset the size and positional relationship between the stopper member 2 and the roller 1.

Therefore, various experiments were carried out. Assuming that the distance from the roller end surface to the stopper member in the axial direction of the roller 1 is a and the width of the roller 1 in the axial direction is c, a, c, R and r. Where a = c / A, where A = 4 to 6
And a = (R−r) × B, where B = 5 to 35 is satisfied, the problem such as non-feeding due to the provision of the stopper member 2 does not occur, and the stopper member is preferable. It turned out that the paper regulation was obtained. Moreover, this configuration makes it very easy to manage the gap between the stopper member 2 and the roller 1.

When the paper P passing between the stopper member 2 and the roller 1 is wavy as shown in FIG.
There is a possibility that the center of the swells up and the contact with the roller 1 becomes insufficient, resulting in non-feeding or the like.

Therefore, in order to prevent such a problem from occurring, as shown in FIG. 6, a guide member 5 extending downstream from the stopper member 2 in the sheet conveying direction may be provided. The guide member 5 of this embodiment is supported on the downstream surface of the stopper member 2 with its guide surface having an appropriate distance from the surface of the roller 1, and the tip end thereof is in contact with the roller 1 for the separation blade 4. Has reached a position on the downstream side.

The sheet feeding device having the above-mentioned structure is provided with the stopper member 2
It is possible to prevent the sheet from floating on the downstream side of the sheet, and prevent the sheet from being unfed. In the above embodiment, if the width c of the roller 1 in the axial direction is too large, the effect may be diminished by the guide member 5 attached to the stopper member 2. Therefore, as shown in FIG. 7, the guide member 5 may be a plate-shaped member in which the recess 6 is formed at a position corresponding to the portion of the separating member 4. According to this structure, it is possible to more reliably prevent the sheet from floating.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the above embodiments and various modifications can be made. For example, as shown in FIG. 8, the roller 1 is configured by connecting two large-diameter roller portions 1b with a small-diameter roller portion 1a, and the stopper member 2 is provided not only on both sides of the roller 1 but also on the small-diameter roller portion 1a. You may provide in a corresponding position. In this case, the stopper member 2 provided on the small-diameter roller portion 1a also has a, c, R, and r as a = c / A, where A = 4 to 6 and a = (R−r) × B. However, B = 5
Try to satisfy ~ 35 relationship.

[0019]

According to the structure of the present invention, at least the tip of the stopper member is arranged within the width range of the diameter of the roller in the sheet conveying direction and adjacent to the roller, and the radius of the roller is R. , The stopper member is provided so as to satisfy r−R <0, where r is the length of a perpendicular line from the tip of the stopper member to the straight line in the sheet conveying direction passing through the center of the roller. Since the member and the roller are dislocated, the number of sheets on the downstream side of the stopper member in the sheet conveying direction can be reliably regulated.

According to the structure of claim 2, when the distance from the roller end face to the stopper member in the axial direction of the roller is a and the width in the axial direction of the roller is c, a, c,
R and r are a = c / A, where A = 4 to 6 and a =
By satisfying the relationship of (R−r) × B, where B = 5 to 35, good paper regulation by the stopper member can be obtained without causing problems such as non-feed due to the provision of the stopper member.

[Brief description of drawings]

FIG. 1 is a front explanatory view showing a part of a paper feeding device according to the present invention.

FIG. 2 is a side view illustrating a part of the sheet feeding device.

FIG. 3 is a side view illustrating an embodiment of a paper feeding device according to the present invention.

FIG. 4 is a side view illustrating another embodiment of the paper feeding device according to the present invention.

FIG. 5 is a front explanatory view showing a sheet passing state of the sheet feeding device according to the present invention.

FIG. 6 is a side view illustrating another embodiment of the paper feeding device according to the present invention.

FIG. 7 is a perspective view showing a modified example of FIG.

FIG. 8 is a front explanatory view showing an application example of the paper feeding device according to the present invention.

[Explanation of symbols]

 1 Roller 2 Stopper Member 2a Tip Part 11 Separation Roller 21 Pickup Roller

Claims (2)

[Claims] 1. At least one roller that is driven to rotate in the sheet conveying direction and is in contact with a surface of a stacked sheet to feed the sheet, a separating member that separates the sheets to be fed one by one, and the separating member. In a paper feeding device having a stopper member that regulates the number of sheets of paper that arrives, at least the tip end portion of the stopper member is arranged within the width region of the diameter of the roller in the paper conveyance direction and adjacent to the roller. , The radius of the roller is R,
When the length of the perpendicular line from the tip of the stopper member to the straight line passing through the center of the roller in the sheet conveying direction is r,
The sheet feeding device, wherein the stopper member is provided so as to satisfy r−R <0. 2. The sheet feeding device according to claim 1, wherein a is a distance between the roller end surface in the axial direction of the roller and the stopper member, and c is a width of the roller in the axial direction. , R, r are a = c / A, where A
= 4 to 6 and a = (R−r) × B, where B = 5 to
A paper feeding device characterized by satisfying the relationship of 35.