JPH07223750A - Paper feed device - Google Patents

Abstract

PURPOSE:To prevent the occurrence of a rush state to facilitate sure paper feed by oscillatably supporting a stopper member having an edge-shaped tip, and providing a pressing means in which the edge-shaped tip energizes rotating force in a direction reverse to a form carrying direction and a means to hold the stopper member at a fixed position. CONSTITUTION:A stopper member 10 is pressed against a positioning member by the rotating force F of a spring 12, and held at a fixed position inclined as much as an angle theta to a carrying direction. An edge tip part 10a separates an upper form from a lower form to control the number of sheets of forms arriving at a separating blade 2. Thus in the case where the coefficient of friction between the fed forms is large, a group of the upper forms is made to push the stopper member 10 left by friction between the forms separated into an upper part and lower part by the stopper member 10. The stopper member 10 pushes back the part having abutted against the stopper member 10 of the forms 6 by pressing force A in an arrow direction being due to the rotating force F of the spring 12 and separates the forms.

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. FIG. 5 shows a conventional example of the paper feeding device of this paper feeding system.

In FIG. 5, a separating blade 2 as a separating member is pressed onto the sheet feeding roller 1, and the separating blade 2 is made of a material having a high friction coefficient. The friction coefficient is set to be higher than 2. This separation blade 2 is rotatably supported by a bracket 5 via a shaft 3,
It is pressed against the paper feed roller 1 by the action of the torsion spring 4. The paper 6 to be fed is placed on a stand 8 protruding from the pickup roller 7, and is pressed against the pickup roller 7 by a pressure plate 9.

At the time of paper feeding, the pickup roller 7 is rotationally driven counterclockwise and the lowest paper 6 is sent to the paper feeding roller 1. However, when the friction coefficient between the papers 6 is large to some extent, a large number of papers 1 It may be sent every time.
Therefore, a stopper member 10 is provided on the upstream side of the separating blade 2 in the sheet conveying direction to regulate the number of sheets reaching the separating blade 2. As a result, the sheets are conveyed one by one due to the friction of the separation blade 2.

In order to prevent the sheet 6 from being caught by the stopper member 10 and prevented from being fed by the stopper member 10, the stopper member 10 is fixed to a bracket or the like at an angle θ, usually about 60 °, with respect to the conveying direction. There is. By providing the stopper member 10 with an inclination, it is possible to prevent the above-described sheet 6 from being caught.

[0006]

However, in the case of feeding cotton paper having a high coefficient of friction in the conventional paper feeding device, the set paper becomes one block and the stopper 1 is used.
It may be sent up to 0, and it may happen that it will sneak under the stopper 10 as it is. In such a state, the paper is jammed between the stopper 10 and the paper feed roller 1, that is, a so-called rush state, and the paper cannot be fed by the feeding force of the paper feed roller 1 and the pickup roller 7, The sheet is sandwiched between the stopper 10 and the sheet feeding roller 1 and the adhesion of the sheets is increased, resulting in frequent double feeding.

The present invention solves the above-mentioned conventional problems and provides a paper feeding device which prevents the occurrence of a rush state, which is one of the causes of non-feeding and double feeding, and provides good and reliable paper feeding. The purpose is to do.

[0008]

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 paper feeding device having a separating member for separating sheets one by one and a stopper member for regulating the number of sheets reaching the separating member, the stopper member is swingably supported and the number of sheets is regulated. Has a tip portion formed in an edge shape, and the edge-shaped tip portion urges the stopper member to rotate in a direction opposite to the sheet conveying direction, and a pressing means that opposes the pressing force of the pressing means. And means for holding the stopper member in a predetermined position.

Further, in order to achieve the above object, the present invention is configured such that the stopper member is made of an elastic member, and the elastic member generates a force for pushing back the sheet by a reaction force deformed in the sheet conveying direction when the sheet is conveyed. It is characterized by being fixed at the top as shown.

Further, according to the present invention, in order to achieve the above-mentioned object, the stopper member is composed of a plurality of stacked elastic members, and the elastic members independently move toward the downstream side in the sheet conveying direction. It is characterized in that it is arranged close to the paper feed roller.

[0011]

According to the above construction, the stopper member is swingably supported, and the leading end portion on the side for regulating the number of sheets is formed in an edge shape, and the edge-like leading end portion with respect to the stopper member is in the sheet conveying direction. Since the pressing means for urging the turning force in the reverse direction and the means for holding the stopper member at a predetermined position against the pressing force of the pressing means are provided, the edge of the stopper member separates the sheets. However, the number of sheets reaching the separating member can be reliably regulated, the occurrence of rush due to the rotation of the stopper member can be avoided, and non-feeding and double feeding due to rush can be prevented.

[0012]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is an explanatory view showing a part of a paper feeding device according to the present invention. In FIG. 1, the same members as those in FIG. 5 are designated by the same reference numerals, the paper feed roller 1 and the separation blade 2 have the same configuration, and only the stopper member 10 is different. The stopper member 10 in this embodiment is swingably supported around a shaft 11 by a bracket or the like (not shown), and a spring 12 constantly urges a turning force F in the direction of the arrow in FIG. It is held at a predetermined position by the positioning member 13. That is, the stopper member 10 is rotated by the turning force F of the spring 12 and the positioning member 13 is moved.
And is held at a predetermined position inclined by an angle θ with respect to the transport direction. Further, the tip end portion 10a of the stopper member 10 on the side that regulates the number of sheets is edge-shaped, and the edge tip end portion 10a separates the upper side sheet and the lower side sheet 2 and reaches the separation blade 2. The number of sheets is regulated.

In the sheet feeding device having such a structure, when the coefficient of friction between the sheets to be fed is large, the lump of the upper sheet is caused by the friction between the sheets divided into upper and lower parts by the stopper member 10 and the stopper member 10 is shown in the figure. Although it is pushed to the left, the stopper member 10 is biased by the pressing force A in the direction of the arrow by the turning force F of the spring 12, so that the stopper member 1
The sheet 6 that has abutted against 0 is pushed back and separated. Further, even when the lump of the paper 6 gets under the stopper member 10 due to the large friction between the paper, the stopper member 10 rotates clockwise about the shaft 11 to prevent the above-mentioned rush. You can

FIG. 2 is an explanatory view showing another embodiment of the present invention. In this embodiment, the stopper member 20 is made of a thin elastic member such as a leaf spring, and the stopper member 20 has a screw 21 at its upper portion. It is fixed in surface contact with the bracket 5 and the like.

The sheet feeding device having the above structure also includes the stopper member 20.
Is deformed by being pressed by the paper 6, a force A for pushing the paper 6 back in the direction of the arrow is generated. Further, the tip end portion 20a of the stopper member 20 on the side that regulates the number of sheets is used in a state where burrs are removed, but it is cut by a press, and if it is used in this way, the manufacturing cost is considered, and the edge tip portion 20
By a, good paper separation can be obtained. Further, similarly to the above-described embodiment, even when a large lump of the sheet 6 has sunk under the stopper member 20, the stopper member 20 is deformed and rush can be prevented.

FIG. 3 is an explanatory view showing still another embodiment of the present invention. In this embodiment, the stopper member 30 is constituted by stacking a plurality of thin elastic members such as leaf springs. In this case, the plurality of leaf springs are brought closer to the paper feed roller 1 toward the downstream side in the paper transport direction, and the leading end portion 30a is formed in a stepped shape.

A leaf spring 30 which constitutes the stopper member 30.
A, 30B, 30C, 30D and 30E are respectively F1, F2 and F2 with respect to the paper 6 when they are pressed and deformed by the paper.
The force of F3, F4, F5 causes the paper to be pushed back. At this time, the force F1 of the leaf spring 30A on which the largest number of leaf springs overlap is the largest, and the leaf springs 30B, 30C, 3
It becomes smaller as it becomes 0D and 30E. That is, F1>F2>F3>F4> F5. Further, the leading end portion 30a of the stopper member 30 on the side that regulates the number of sheets is used in a state in which burrs are removed but cut by a press, as in the above embodiment.

Since the sheet feeding device having such a structure has many edges for separating the sheets, the sheets can be sorted in a stepwise manner, and the double feeding can be reliably prevented even when the sheets having a large friction coefficient between the sheets are fed. can do. Further, since the stopper member 20 is deformed even in a rush, this can be prevented.

[0019]

According to the first aspect of the invention, the stopper member is swingably supported, and the tip end portion on the side for regulating the number of sheets is formed in an edge shape, and the edge tip end portion is formed with respect to the stopper member. Is provided with pressing means for urging rotational force in the direction opposite to the sheet conveying direction, and means for holding the stopper member at a predetermined position against the pressing force of the pressing means, so the edge tip of the stopper member is provided. Separate the paper,
The number of sheets reaching the separating member can be reliably regulated, the occurrence of rush due to the rotation of the stopper member can be avoided, and non-feeding and double feeding due to rush can be prevented.

According to the second aspect of the invention, the stopper member is composed of an elastic member, and the elastic member is fixed at the upper portion so that a force for pushing back the paper is generated by the reaction force deformed in the paper carrying direction when the paper is carried. Therefore, it is possible to prevent rush and obtain good paper separation, and the stopper member has a simple structure and can be provided at low cost. In particular, since the edge portion is used almost in the pressed state, the manufacturing cost is low.

According to the third aspect of the invention, the stopper member is composed of a plurality of stacked elastic members, and the elastic members are independently brought closer to the paper feed roller toward the downstream side in the paper transport direction. It is arranged as
Since the paper has a large number of edges and is arranged in a step-like manner, it is possible to reliably prevent double feeding even when paper with a large coefficient of friction between papers is fed, and it is possible to reliably prevent rush.

[Brief description of drawings]

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

FIG. 2 is an explanatory diagram showing another embodiment of the paper feeding device according to the present invention.

FIG. 3 is an explanatory view showing still another embodiment of the paper feeding device according to the present invention.

FIG. 4 is an enlarged explanatory view showing a main part of the paper feeding device of FIG.

FIG. 5 is an explanatory diagram showing a conventional paper feeding device.

[Explanation of symbols]

 1 Paper Feeding Roller 2 Separation Blade 10, 20, 30 Stopper Member 12 Spring 13 Positioning Member

Claims (3)

[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 to reach, the stopper member is swingably supported, and a tip portion on the side that regulates the number of sheets is formed in an edge shape,
The edge-like tip end portion of the stopper member biases a rotational force in the direction opposite to the sheet conveying direction, and a means for holding the stopper member at a predetermined position against the pressing force of the pressing means. A sheet feeding device characterized by being provided. 2. At least one roller that is driven to rotate in the sheet conveying direction and is in contact with a stacked sheet surface to feed the sheet, a separating member that separates the sheet 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, the stopper member is formed of an elastic member, and the elastic member generates a force to push back the paper by a reaction force deformed in the paper conveyance direction by the paper conveyance. A paper feeding device characterized in that it is fixed at the upper part so that 3. At least one roller that is driven to rotate in the sheet conveying direction and is in contact with a stacked sheet surface 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, the stopper member is composed of a plurality of stacked elastic members, and the elastic members independently move toward the downstream side in the paper transport direction. A sheet feeding device, which is disposed close to a sheet feeding roller.