JPH05116771A - Sheet feeding device - Google Patents

Abstract

PURPOSE:To provide a sheet feeding device which reliably feeds sheet-form paper pieces one by one to the sheet feed port of an image recording device without being influenced by the thickness of a paper sheet. CONSTITUTION:A paper table on which sheet-form paper P are placed is divided into front and rear paper tables 2A and 2B. The rear end part of the front paper table 2A is vertically rotatably arranged and the front end part of the rear paper table 2B is vertically rotatably provided. An eccentric cam 10A to change the rear paper table 2B from a parallel state to an inclined state based on the front paper table 2A is mounted on the upper surface part of a body.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper feeding device for feeding sheet-like paper to an image recording device such as a printing device or a laser printer.

[0002]

2. Description of the Related Art Conventionally, a sheet feeding apparatus of this type has a main body mounted in a sheet feeding port of an image recording apparatus, a paper table rotatably provided in an upper and lower direction on an upper surface of the main body, and a paper table. A spring member that presses a plurality of sheet-shaped sheets stacked on the paper table against the sheet feeding roller by a spring force,
It has a pair of left and right sheet separating members provided on the upper surface of the main body, and the sheet-like sheet is fed to the sheet feeding port of the image recording apparatus by the frictional force of the sheet feeding roller and the sheet separating force of the sheet separating member.
It is configured to supply one by one.

[0003]

However, in such a conventional sheet feeding device, the claw portion of the sheet separating member is engaged with the front corner portion of the sheet-like sheet and the sheet-like sheet is fed by utilizing the stiffness of the sheet-like sheet. Since the method of separating the sheet-shaped paper that contacts the paper roller from other sheet-shaped paper is adopted, there is no problem in the case of thin paper (continuous weight of 55 to 70 kg), but thick paper In the case of paper (a continuous weight of about 80 kg), the stiffness of the paper becomes stronger than the frictional force of the paper feed roller, and there is a problem that skew or the like occurs. In order to prevent feeding defects such as skew, it is sufficient to increase the contact pressure of the sheet-shaped paper with respect to the paper feed roller, that is, the spring force of the spring member. However, there is a problem that multi-feed occurs when is used.

The present invention has been made in view of the above problems, and its purpose is to reliably feed sheet-like sheets one by one to a sheet feed port of an image recording apparatus without being influenced by the sheet thickness. The present invention is intended to provide a paper feeding device that can do this.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is provided with a main body mounted on a paper feed port of an image recording apparatus, and an upper surface of the main body so as to be vertically rotatable. A paper table, an urging member that presses a plurality of sheet-shaped sheets stacked on the paper table against a sheet feeding roller by an urging force, and a front corner portion of the sheet-shaped sheet provided on the upper surface of the main body. In a sheet feeding device having a pair of left and right sheet separating members having engaging claw portions, the paper table is divided into a front paper table and a rear paper table, and a rear end portion of the front paper table is vertically moved. The front end of the rear paper table is rotatably provided, and the front end of the rear paper table is vertically rotatable, and the rear paper table is provided on the upper surface of the main body. It is provided with a means for changing the state of being inclined from the parallel to the Buru.

[0006]

According to the above construction, when the rear paper table is changed from the state parallel to the front paper table to the state inclined, the contact pressure of the sheet-shaped paper against the paper feed roller is increased, and conversely, the rear paper table is reversed. When the table is returned to be parallel to the front paper table, the contact pressure of the sheet of paper with respect to the paper feed roller is weakened. Therefore, the contact pressure of the sheet-shaped paper with respect to the paper feed roller can be switched according to the paper thickness, so that the sheet-shaped paper can be fed to the paper feed port of the image recording apparatus without being influenced by the paper thickness.
It is possible to supply each piece reliably.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 is a front view of a sheet feeding device according to an embodiment of the present invention, and FIG. 2 is a plan view thereof. In addition, FIG.
2 is a cross-sectional view taken along the line AA in FIG. 1. A front side paper table 2A and a rear side paper table 2B are provided in the main body 1 of the sheet feeding device so as to cover an upper surface portion of the main body 1. These paper tables 2A and 2B are made of, for example, a metal plate-like material, and are rotatable around a shaft 3 in the vertical direction. The shaft 3 rotatably supports the rear end of the front paper table 2A and the front end of the rear paper table 2B.
Is supported on the left and right side walls of the.

Coil-shaped spring members 4a and 4b are provided on the upper surface of the main body 1. These spring members 4
a and 4b are a plurality of sheet-like sheets P stacked on the front paper table 2A and the rear paper table 2B.
Is to be pressed against the paper feed rollers 5a and 5b, and is arranged directly below the paper feed rollers 5a and 5b.

The paper feed rollers 5a and 5b are rotatably supported on the left and right side wall portions of the main body 1 via a drive shaft 6, and one end of the drive shaft 6 has a drive gear on the image recording apparatus side (see FIG. A driven gear 7 that engages with (not shown) is provided.

A sheet separating member 8 is provided on the upper surface of the main body 1.
a and 8b are provided. These paper separating members 8
a and 8b are the paper feed rollers 5a and 5b when the sheet-shaped paper P is supplied to the paper feed port of the image recording apparatus by the paper feed rollers 5a and 5b.
a sheet of paper P that contacts a and 5b is replaced with another sheet of paper P
And a claw portion 9 for engaging with the front side corner portion of the sheet-like paper P.

An eccentric cam 10 is provided on the upper surface of the main body 1.
a and 10b are arranged on the lower surface side of the rear paper table 2B. The eccentric cams 10a and 10b are for changing the rear side paper table 2B from a state parallel to the front side paper table 2A to a state inclined downward, and are supported by the cam shaft 11. The cam shaft 11 is rotatably supported on the left and right side walls of the main body 1, and an operation lever 12 is provided at one end of the cam shaft 11.

In the sheet feeding device constructed as described above, the operation lever 12 is operated to move the eccentric cams 10a and 10b to about 1 mm.
/ 2 rotation, as shown in FIG. 4, when the rear paper table 2B is changed from the state parallel to the front paper table 2A to the state inclined downward, the paper is loaded on the front paper table 2A and the rear paper table 2B. The sheet-shaped sheet P thus formed has an arched shape, and a force of pushing up the sheet feeding rollers 5a and 5b is generated on the sheet-shaped sheet P due to the stiffness of the sheet. As a result, the contact pressure of the sheet-shaped paper P with respect to the paper feed rollers 5a and 5b increases, so that a sheet-shaped paper having a large paper thickness can be supplied to the paper feed port of the image recording apparatus without causing skew or the like.

Further, when a thin paper is used, when the rear paper table 2B is returned to a state parallel to the front paper table 2A, the paper feed rollers 5a, 5
Since the contact pressure of the sheet-shaped paper P with respect to b is weakened, the thin sheet-shaped paper can be supplied to the paper feed port of the image recording apparatus without causing multi-feeding.

As described above, in this embodiment, the sheet-like paper P
Is divided into a front paper table 2A and a rear paper table 2B, and a rear end portion of the front paper table 2A is provided so as to be vertically rotatable about an axis 3 and a rear paper table 2B. The front end of the is provided so as to be vertically rotatable about the shaft 3,
Moreover, since the eccentric cams 10a and 10b for changing the rear paper table 2B from the parallel state to the front paper table 2A to the downward inclined state are provided on the upper surface of the main body 1, the rear paper table 2B is moved to the front paper. By changing from the state parallel to the table 2A to the state inclined downward, it is possible to increase the contact pressure of the sheet-shaped paper P with respect to the paper feed rollers 5a and 5b. Therefore, the contact pressure of the sheet-shaped paper P to the paper feed rollers 5a and 5b can be switched according to the paper thickness, so that the sheet-shaped paper P can be fed to the paper feed port of the image recording apparatus without being influenced by the paper thickness. It is possible to supply each piece reliably.

In the above embodiment, the sheet feeding rollers 5a, 5
Although b is provided on the sheet feeding device side, the same effect can be obtained by providing it on the image recording device side. Further, in the above embodiment, the front paper table 2A and the rear paper table 2B are used.
Although they are supported by the common shaft 3, they may be supported by different shafts.

In the above embodiment, the eccentric cams 10a and 10b are used as means for changing the rear side paper table 2B from the state parallel to the front side paper table 2A to the state inclined downward, but instead of the eccentric cams. Alternatively, a link mechanism or the like may be used.

[0018]

As described above, according to the present invention, the paper table on which the sheet-like sheets are stacked is divided into the front paper table and the rear paper table, and the rear end of the front paper table is vertically rotated. The front end of the rear paper table is freely rotatable, and the front end of the rear paper table is rotatable in the vertical direction. Since it is provided, the contact pressure of the sheet-shaped paper with respect to the paper feed roller can be switched according to the paper thickness. Therefore, it is possible to provide a sheet feeding device capable of reliably feeding the sheet-shaped sheets one by one to the sheet feeding port of the image recording apparatus without being influenced by the sheet thickness.

[Brief description of drawings]

FIG. 1 is a front view of a paper feeding device according to an embodiment of the present invention.

FIG. 2 is a plan view of the sheet feeding device.

3 is a sectional view taken along the line AA in FIG.

FIG. 4 is an operation explanatory view of the same embodiment.

[Explanation of symbols]

1 ... Main body, 2A ... Front side paper table, 2B ... Rear side paper table, 4a, 4b ... Spring member, 5a, 5b ...
Paper feed rollers, 8a, 8b ... Paper separating members, 10a, 10
b ... eccentric cam, 11 ... cam shaft, 12 ... operating lever.

Claims (1)

[Claims] 1. A main body attached to a paper feed port of an image recording apparatus, a paper table rotatably provided on an upper surface of the main body in a vertical direction, and a plurality of sheets stacked on the paper table. An urging member that presses the sheet-shaped sheet against the sheet feeding roller by an urging force, and a pair of left and right sheet separating members that are provided on the upper surface of the main body and that have a claw portion that engages with the front corner of the sheet-shaped sheet. In the sheet feeding device having the paper table, the paper table is divided into a front paper table and a rear paper table, a rear end of the front paper table is rotatably provided in the vertical direction, and a front end of the rear paper table is provided. It is rotatably provided in the vertical direction, and the rear side paper table is changed from a state parallel to the front side paper table to an inclined state on the upper surface of the main body. A sheet feeding device, characterized in that it is provided with a means for causing it.