JP2905281B2 - Automatic paper feeder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention stacks and stores a plurality of sheets cut into a predetermined size, and claws having a predetermined area at two corners of the stacked and stored sheets. The present invention relates to an automatic paper feeder that separates and conveys one sheet from the top by rotating a friction roller abutted at a predetermined pressure on the top while being restrained by a copier, a printer, Used for recording media transport systems such as plotters.

[Prior Art] FIG. 3 shows a schematic structure of a conventional automatic sheet feeding apparatus.

A plurality of sheets (cut sheets) 1 cut to a predetermined size are stacked and stored on a sheet tray 2.

A spring 4a and a spring 4b are provided between the paper tray 2 and the bottom plate 3, and the paper tray 2 is pushed upward by the repulsive force of the springs 4a and 4b.

On the other hand, a friction roller 5 made of an elastic material such as rubber is provided on the uppermost portion of the stacked sheets 1.
Is pressed against the friction roller 5 with a predetermined pressure (nip pressure) generated by the springs 4a and 4b.

A motor 6 for rotational driving is mechanically coupled to the friction roller 5, and when the motor 6 is rotated in the direction of the arrow, a friction force generated between the friction roller 5 and the uppermost sheet is generated.
The hardness of the friction roller 5 and the spring characteristics of the springs 4a and 4b are selected so as to be sufficiently larger than the frictional force generated between the uppermost sheet and the second sheet immediately below.

Also, nails 7 each having a predetermined area are provided at two corners of the paper 1.
Arms 7 and 8 provided with the friction rollers 5 are provided with claw guides 9 (claw guides of the claw 8a are not shown) for suppressing the movement of the claws 7a and 8a in the sheet width direction. It functions to separate the paper 1 while partially blocking the width of the paper. S is a support shaft of the arm 7.

Further, when the friction roller 5 is rotated in the same direction, it is curved at the two pawls 7a and 8a at the two corners of the uppermost sheet, and finally rides over the two pawls 7a and 8a.

As a result, the uppermost sheet is separated from the second sheet and conveyed in a predetermined direction.

[Problems to be Solved by the Invention] By the way, in the conventional apparatus, when the sheet is conveyed, the pawls 7a and 8a are forced to act on the inside or outside of the sheet width by the sheet curved at each claw portion. Receive.

The structure is such that the pawl guide 9 is installed so that each pawl does not move in the paper width direction due to this force. In this case, however, the number of assembling steps is increased, the structure is complicated, and the assembling efficiency is reduced.

The present invention solves the above-mentioned problems (problems) of the related art, simplifies the structure, suppresses the movement of the claws in the sheet width direction during sheet conveyance while improving the assembling efficiency, and automatically feeds the sheet reliably. It is an object to provide a paper device.

Means for Solving the Problems In order to solve the above problems, the automatic sheet feeding apparatus of the present invention stores and stores a plurality of sheets, restrains two corners of the sheets,
In an automatic paper feeder that separates and transports the uppermost sheet by rotating a friction roller that is in contact with the uppermost part of the sheet at a predetermined pressure, the paper tray is positioned at the same width as the sheet cut to a predetermined size. A paper tray having a wall; and an arm rotatable in the paper stacking direction having a claw for restraining two corners of the paper with a predetermined area. The arm and a claw that is integral with the arm are provided inside the paper tray wall. The paper tray wall slides when the paper is conveyed, so that the pawls are prevented from moving in the paper width direction, thereby preventing paper jams and double feeding.

[Operation] Therefore, when the sheet is conveyed, the nail is brought into contact with the paper tray wall by the force of the curved sheet, and the movement of the nail in the sheet width direction is suppressed.

As a result, there is no need to install a claw guide, which simplifies the claw guide structure and enables reliable transport of paper while improving assembly efficiency.

[Example] The present invention will be specifically described below with reference to an example shown in FIG.

In each of the drawings, the same components as those of the conventional device are denoted by the same reference numerals as those of FIG.

According to the present invention, as shown in FIGS.
The paper tray walls 10 and 11 are provided in the width direction of the paper tray, and the claws 7a and 8a are provided inside the paper tray walls 10 and 11 in the paper width direction and the arms 7 and 8 respectively.
Are arranged so as to be in contact with the outsides thereof without giving any resistance to the movement in the sheet stacking direction.

According to the above configuration, when the transport operation is performed, the pawls 7a and 8a contact the paper tray walls 10 and 11 by the force of the curved paper, so that the positions of the claws in the paper width direction do not always change.

[Effect of the Invention] As described above, the automatic paper feeder of the present invention has a simple structure in which the paper tray wall is added to the conventional example, so that the arm and the claw slide on the inner and outer surfaces of the paper tray wall. Since the movement of the nail in the paper width direction is suppressed by the paper tray wall during the paper transport, the following effects are obtained.

The movement of the nail in both directions in the sheet width can be regulated without installing a nail guide or the like.

The structure of the device can be simplified.

Therefore, assemblability was improved.

Stable sheet separation can be realized without receiving a force in the width direction received by the curved sheet at the time of sheet separation.

Therefore, the paper is reliably transported.

Therefore, paper jam is prevented.

Also, double feeding of paper is prevented.

[Brief description of the drawings]

1 and 2 are a perspective view and a plan view, respectively, showing the structure of an automatic sheet feeder according to an embodiment of the present invention. FIG. 3 is a perspective view showing the structure of a conventional automatic sheet feeder. 1: Paper, 2: Paper tray 5: Friction roller, 7, 8: Arm 7a, 8a: Claw 10, 11: Paper tray wall

Claims (1)

(57) [Claims] 1. An automatic sheet stacker for stacking and storing a plurality of sheets, restraining two corners of the sheets, and separating and conveying the uppermost sheet by rotation of a friction roller abutted on the uppermost part of the sheet at a predetermined pressure. In a paper feeding device, a paper tray having a paper tray wall at the same width as the paper cut into a predetermined size;
An arm rotatable in the paper stacking direction is provided with a claw that restrains a corner at a predetermined area. The arm and a claw that is integral with the arm are in sliding contact with both the inner and outer surfaces of the paper tray wall, and when the paper is conveyed. An automatic paper feeder characterized in that the paper tray wall restrains the pawl from moving in the paper width direction to prevent paper jams and double feeding.