JPH0671805B2 - Paper feeder - Google Patents

Description

Description: TECHNICAL FIELD OF THE INVENTION The present invention relates to a sheet feeding device for feeding a sheet to, for example, a platen portion of a printer, and in particular, to an improved sheet guide used when feeding a sheet. .

[Technical background of the invention]

FIG. 2 of the accompanying drawings is a conceptual diagram showing a schematic configuration of a conventional sheet feeding device. A sheet (not shown) is fed between the platen 1 and the print head 2. A paper guide 3 is provided along the platen 1 for guiding the paper. There are two paper feeding states. The case where the paper is fed from the A direction to the B direction indicated by the arrow in the figure is referred to as the pulling of the paper, and the case where the paper is fed from the C direction to the D direction. This is called sending.

The tractor 4 is configured to be rotatable by supporting one point, and is rotated and fixed at different positions when the paper is pulled and when the paper is fed.

That is, the state shown by the solid line in the figure shows the tractor position 4a when the sheet is pulled, and the state shown by the two-dot chain line shows the position 4b when feeding. In the following description, the members with a and b added after the numbers indicate the members at the time of pulling and at the time of feeding.

The paper guide 5 is directly attached to the tractor 4,
The paper guide 5 rotates together with the tractor 4 according to the rotation of the tractor 4. A partition plate 7 is usually provided in order to partition between a mechanical section configured by such a platen and a tractor and a mounting space 6 in which a member for controlling the mechanical section is mounted.

[Problems of background technology]

As described above, in the conventional paper feeding device (hereinafter, a printer will be described as an example of the paper feeding device),
It was structured to be used as a paper insertion guide when the pulling tractor was in use.

In such a mechanism, since the paper guide 5 moves together with the tractor 4, the paper guide 5 extends downward in the feeding state if the paper insertion portion (the arrow A portion) is widened when the pulling tractor is used to facilitate the insertion of paper. Therefore, the mounting space 6 for mounting the board becomes narrower. Further, in order to prevent the mounting space 6 from being exposed when the tractor 4 is removed from the printer, the partition plate 7 is attached to the tractor 4.
It is necessary to extend it to the rear of the car, which has the drawback of increasing the weight and increasing the cost.

[Object of the Invention]

The present invention has been made to eliminate the above-mentioned drawbacks,
It is an object of the present invention to provide a paper feeding device having a structure that allows a large mounting space to be taken even when the tractor moves between pulling and feeding, and that can easily insert paper when using the pulling tractor. .

[Outline of Invention]

To achieve the above object, the present invention has a pulling position for conveying a sheet and pulling it out from a sheet processing section, and a feeding position for conveying the sheet and sending it to the sheet processing section.
The paper guide is provided with a tractor portion that can be selectively positioned by movement, a paper guide movably provided in the main body of the paper processing apparatus, and a biasing unit combined with the paper guide. Is located at a predetermined distance from the tractor portion and is located at the first position by the biasing means, and when the tractor portion is moved from the pulling position to the feeding position, it is pressed by the moved tractor portion. The present invention provides a sheet feeding device configured to move to the second position retracted from the tractor unit.

Example of Invention

An embodiment of the present invention will be described below with reference to FIG. 1 of the accompanying drawings. FIG. 1 is a conceptual diagram showing a schematic configuration of a printer equipped with a sheet feeding device according to an embodiment of the present invention.
In the following description, the same parts as those shown in FIG. 2 are designated by the same reference numerals and the description thereof will be omitted.

A stopper 3A is provided at the end of the paper guide 3 of the platen portion, which is the paper processing portion of the printer, and serves to fix the paper guide 8 described later when the paper is pulled.
The point that the paper guide 8 is attached to the main body of the printer is different from the conventional apparatus. With conventional devices,
The paper guide was directly attached to the tractor 4,
In the present invention, the paper guide 8 is separated from the tractor 4 and attached to the main body of the printer.

The paper guide 8 is located at a position 8a shown by a solid line in the pulling tractor state, and at a position 8b shown by a two-dot chain line in the drawing in a feeding tractor state used as a paper insertion guide. The paper guide 8 is attached to the printer body so as to be rotatable around an end portion on the side opposite to the platen side, and the end portion is in contact with one end of a spring 9 and the other end of the spring 9 is provided. Is fixed to the printer body by a stopper 10. Since the paper guide 8 is biased upward by the spring 9, the tractor 8
Is in the pulling position 4a, or when the tractor 8 is removed, the paper guide 8 contacts the stopper 3A of the platen-side paper guide 3 and stays in the position 8a indicated by the solid line. At this position 8a, the paper guide 8 functions as a guide for inserting the paper into the platen portion, and also functions as a partition plate that covers the mounting space 6 inside the printer body when the tractor 8 is removed. To do.

A tractor frame 11 is fixedly attached to the tractor 8, and the two form an integral tractor portion. The tractor portion includes a pulling position for pulling the paper from the platen portion when the tractor 4 is at the position 4a, and the tractor 4
Can be rotated and positioned at the position 4b and the feeding position for feeding the sheet to the platen portion. A protrusion 12 is provided on the lower portion of the tractor frame 11. When the tractor portion is in the pulling position shown by the solid line, the projection 12 of the tractor frame 11 is separated from the paper guide 8, and a sufficient space is provided between the tractor portion and the paper guide 8 for easy insertion of paper. ing. And
When the tractor 4 rotates downward when feeding paper,
The paper guide 8a, which is pushed up by the spring 9 and comes into contact with and stops at the stopper 3A, is attached to the tractor frame 11
The lower protrusion 12 presses and pushes downward, and the paper guide 8 is moved in the same direction as the rotation direction of the tractor 4.

As is apparent from FIG. 1, in the case of the present invention, a sheet guide 8 is provided with a partition plate 7 for shielding the boundary with the mounting space 6 below the tractor portion. It is configured to have both.

Next, the operation of the apparatus according to the above embodiment will be described.
First, when the tractor 4 is at the position 4a in FIG. 1 and is used as a pulling tractor, the paper is inserted from the direction A and passes between the platen 1 and the paper guide 3 to move the paper to the paper B.
Sent in the direction.

Next, when the pulling tractor state is switched to the feeding tractor state, the paper guide 8 moves the tractor frame 11
It is pressed and lowered by the projection 12 at the bottom of the. And when the tractor 4 moves to the position of 4b, the tractor frame
11 is at the position 11b, and the paper guide 8 is fixed at the position 8b. In the feeding tractor state, the sheet is inserted from the C direction and is fed in the D direction by the tractor 4 in the 4b state.

Conversely, when switching from the feeding tractor state to the pulling tractor state, the tractor frame 11 returns to the position 11a by returning the tractor 4 from the state of 4b to 4a.
The paper guide 8 is pushed up by the spring 9.
Then, it is fixed by the stopper 3A and pushed back to the position 8a to be fixed. In this state, the protrusion 12 is in non-contact with the paper guide 8.

It should be noted that the above description has been made by taking the case of a printer as an example, but the present invention is not limited to the printer, and is for another sheet processing apparatus of the type that realizes the pulled state and the fed state by switching the tractor. The same can be applied to the paper feeding device.

〔The invention's effect〕

As described above, according to the present invention, the paper guide is provided separately from the tractor and can be rotated according to the usage state of the tractor, so that the working space of the tractor can be narrowed and therefore the mounting of the board can be performed. It is possible to obtain a paper feeding device which can widen the space and can easily insert the paper when the pulling tractor is used.

Further, since the paper guide can be used as a part of the partition plate, there is an advantage that weight and cost can be reduced.

[Brief description of drawings]

FIG. 1 is a conceptual diagram of a printer incorporating a sheet feeding device according to an embodiment of the present invention, and FIG. 2 is a conceptual diagram of a printer incorporating a conventional device. 4 ... tractor, 7 ... partition plate, 8 ... paper guide,
9 ... Spring, 10 ... Stopper, 11 ... Tractor frame, 12 ... Projection.

Claims (1)

[Claims] 1. A device for transporting a sheet, which is used in a sheet processing apparatus having a sheet processing unit, wherein a pulling position for transporting the sheet and pulling it out from the sheet processing unit, and the sheet processing for transporting the sheet. A tractor portion that can be selectively positioned by moving at a feeding position for feeding the sheet to a sheet feeding unit, a sheet guide movably provided in the main body of the sheet processing apparatus, and a biasing force combined with the sheet guide. The sheet guide is at a first position, which is a guide for inserting a sheet into the sheet processing section, at a predetermined distance from the tractor section when the tractor section is in the pulling position. When the tractor portion is positioned by the urging means and is moved from the pulling position to the feeding position, the tractor portion is moved by the moved tractor portion. A sheet feeding device, which is pressed to move to a second position retracted from the tractor unit.