JPH07237330A - Paper feeder - Google Patents

Abstract

PURPOSE:To smoothly feed lapped paper temporarily bound by paper staples or the like by a method wherein in a paper feeder provided with upper and lower guides for guiding upper and lower surfaces of paper, the upper guide is provided with relief parts opposed to the both end parts of paper. CONSTITUTION:When lapped paper formed by lapping a plurality of sheets of paper and temporarily binding the both end parts thereof by paper staples is handled by a paper feeder comprising a feed path 6 formed between upper and lower guides 3, 4, in the both end parts of the lapped paper the presence of the paper staples causes the thickness increase and the resistance increase, which results in a problem of reduction of a paper feed accuracy or occurrence of paper clogging. Therefore, relief parts 3a, 4a are respectively formed in the parts of the upper and lower guides 3, 4 opposed to the both end parts of paper. The relief parts 3a, 4a are so constructed as to separate the paper from the surfaces of the guides 3, 4 opposed to the both end parts of paper.

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 such as a printer. More specifically, the present invention relates to a paper feeding device that includes an upper guide that guides the upper surface of a sheet to be fed and a lower guide that guides the lower surface of the sheet, and in particular, a stack in which both side edges are temporarily bound by a so-called paper stapler or the like. The present invention relates to a paper feeding device capable of smoothly feeding paper.

[0002]

2. Description of the Related Art Conventionally, as a paper feeding device in a printer, for example, one shown in FIG. 5 or 6 is known.

In FIG. 5, reference numeral 1 is a platen, and 2 is a print head arranged so as to face the platen 1. 3 is an upper guide, 4 is a lower guide, and 5 is a tractor for feeding continuous paper.

The paper feeding device includes a platen 1, an upper guide 3,
It is composed of a lower guide 4 and a tractor 5.

In this paper feeding device, a paper feed path 6 is formed between the upper guide 3 and the lower guide 4. Paper feed path 6
As the paper, the cut sheet P1 or the continuous paper P2 is supplied. The cut sheet P1 is supplied by, for example, manual feeding,
The continuous paper P2 is supplied by the tractor 5. The supplied cut sheet P1 is conveyed by the platen 1 and is fed to the continuous paper P1.
2 is conveyed by the platen 1 and the tractor 5.

The upper surface of the sheet to be fed is guided by the upper guide 3, and the lower surface thereof is guided by the lower guide 4.

In such a paper feeding apparatus, in order to improve the paper feeding accuracy, the distance C1 between the upper guide 3 and the lower guide 4 and the distance C2 between the lower guide 4 and the platen 1 in the paper feeding path are set. It is set as small as possible.

The paper feeding device shown in FIG.
It is composed of an upper guide 3 ', a lower guide 4', and a tractor 5.

In this paper feeder, a first paper feed path 6a is formed between the platen 1 and the upper guide 3 ', and a second paper feed path is formed between the upper guide 3'and the lower guide 4'. 6b is formed. The cut sheet P1 is manually fed to the first paper feed path 6a, and the continuous paper P2 is fed to the second paper feed path 6b by the tractor 5. The supplied cut paper P1 is conveyed by the platen 1, and the continuous paper P2 is conveyed by the platen 1 and the tractor 5.

The upper surface of the continuous paper P2 to be fed is guided by the upper guide 3'and the lower surface thereof is guided by the lower guide 4 '.

Also in such a paper feeding device, in order to improve the paper feeding accuracy, the space C1 between the upper guide 3'and the lower guide 4'in the paper feeding path, and the lower guide 4'and the platen 1 are provided. Interval C2 is set as small as possible.

[0012]

Among the papers, there is a laminated paper in which both side edges are temporarily bound by so-called paper staples. Such laminated paper is generally constructed as continuous paper.

An example thereof is shown in FIGS.

The laminated paper P3 shown in FIG. 7 is obtained by laminating four sheets of paper 7 and temporarily binding both side edge portions 7a with paper staples 7b. The paper staple 7b is formed by bending four sheets of paper 7 as shown in FIG. 7 (b). In FIG. 7A, 7c is a tractor 5
It is a hole that engages with the pin 5a.

The laminated paper P4 shown in FIG. 8 is obtained by laminating four sheets of paper 8 and temporarily binding both side edge portions 8a with paper staples 8b. The paper staple 8b is a "U" -shaped piece of paper, which is provisionally bound at the hole 8c.

When the above-mentioned laminated paper P3 or P4 is fed by the conventional paper feeding device as described above, the following problems occur.

That is, since both side edge portions of the laminated paper are temporarily bound with paper staples, the thickness thereof is large.

On the other hand, in the conventional paper feeding apparatus, in order to improve the paper feeding accuracy, the space C1 between the upper guide 3 and the lower guide 4 in the paper feeding path, and the lower guide 4 and the platen 1 are provided.
The interval C2 between and is set as small as possible.

Therefore, the laminated paper P3
Further, when P4 is fed, there is a problem that the resistance at both side edge portions 7a or 8a becomes large, and this resistance reduces the paper feeding accuracy or causes a paper jam.

Incidentally, such a problem is not limited to the case where the stapler is temporarily stapled, and the same applies to the laminated paper in which both side edge portions are temporarily stapled with an adhesive or the like to be thick. Was happening to.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above problems and to provide a paper feeding device capable of smoothly feeding a laminated paper whose both side edges are temporarily bound by a stapler or the like.

[0022]

In order to achieve the above object, a paper feeding device according to a first aspect of the present invention comprises an upper guide for guiding the upper surface of the paper to be fed and a lower guide for guiding the lower surface of the paper. In the paper feeding device, an escape portion whose surface facing the paper is distant from the paper is formed at a position of the upper guide facing both side edge portions of the paper.

According to a second aspect of the present invention, there is provided a paper feeding device including an upper guide for guiding an upper surface of a paper to be fed and a lower guide for guiding a lower surface of the paper. It is characterized in that a relief portion is formed at a position facing the side edge portions so that the surface facing the paper is distant from the paper.

According to a third aspect of the present invention, there is provided a paper feeding device including an upper guide for guiding an upper surface of a sheet to be fed and a lower guide for guiding a lower surface of the sheet. It is characterized in that a relief portion is formed at a position facing both side edge portions of the paper, the surface facing the paper being away from the paper.

[0025]

According to the paper feeding device of the first aspect, the upper surface of the paper to be fed is guided by the upper guide, and the lower surface thereof is guided by the lower guide.

At the location of the upper guide that faces both side edge portions of the paper, a relief portion is formed such that the surface facing the paper is away from the paper. Even if a thick laminated paper sheet that is temporarily bound with a stapler or the like is sent, the resistance at both side edge portions does not increase, and therefore the sheet is smoothly sent.

Since the escape portion is formed at a portion facing both side edge portions of the sheet to be fed, the distance between the upper guide and the lower guide can be set to be small at other portions, that is, the central portion. it can. Therefore, even when a sheet other than the laminated sheet is sent as the sheet, the sheet is accurately sent.

Further, since the relief portion is formed in the upper guide, this paper feeding device is particularly suitable for feeding a sheet having a bulging portion (protruding portion) by temporary binding on the upper guide side.

According to the paper feeding device of the second aspect, the upper surface of the fed paper is guided by the upper guide and the lower surface thereof is guided by the lower guide.

Then, at the portion of the lower guide that faces both side edge portions of the sheet, there is formed an escape portion whose surface facing the sheet is away from the sheet. Even if a thick laminated paper sheet that is temporarily bound with a stapler or the like is sent, the resistance at both side edge portions does not increase, and therefore the sheet is smoothly sent.

Since the relief portion is formed at a portion facing both side edge portions of the sheet to be fed, the distance between the upper guide and the lower guide can be set to be small at other portions, that is, the central portion. it can. Therefore, even when a sheet other than the laminated sheet is sent as the sheet, the sheet is accurately sent.

Further, since the relief portion is formed in the lower guide, this paper feeding device is particularly suitable for feeding a sheet having a bulging portion (protruding portion) by temporary binding on the lower guide side.

According to the paper feeding device of the third aspect, the upper surface of the fed paper is guided by the upper guide and the lower surface thereof is guided by the lower guide.

At the portions of the upper guide and the lower guide which face both side edge portions of the sheet, there are formed relief portions whose surface facing the sheet is away from the sheet. Even if a thick laminated paper sheet is temporarily bound by a stapler or the like and sent, the resistance at both side edge portions does not increase, and therefore the sheet is smoothly sent.

Since the escape portion is formed at a portion facing both side edge portions of the sheet to be fed, the distance between the upper guide and the lower guide can be set to be small at the other portions, that is, the central portion. it can. Therefore, even when a sheet other than the laminated sheet is sent as the sheet, the sheet is accurately sent.

Further, in this paper feeding device, since the escape portions are formed on the upper guide and the lower guide, the bulging portion (protruding portion) due to the temporary binding is on either side of the upper and lower guides. , Or even paper on both sides can be fed smoothly.

Further, in any of the paper feeding devices described in claims 1 to 3, as a result that the laminated paper can be fed smoothly, the drive motor of the device can be downsized.

[0038]

Embodiments of the present invention will be described below with reference to the drawings.

<First Embodiment> FIG. 1 is a schematic view showing a first embodiment of the paper feeding apparatus according to the present invention. In this figure, the same or corresponding parts as those of the conventional device shown in FIG. 5 are designated by the same reference numerals.

The feature of this embodiment is that the upper guide 3 and the lower guide 4 are formed with relief portions 3a and 4a, respectively.

The relief portion 3a of the upper guide 3 is, as shown in FIG. 2, both side edge portions 7a or 8a of the sheet (FIGS. 7 and 8).
The surface 3b facing the paper is formed at a position facing the paper (see reference).

The relief portion 4a of the lower guide 4 is, as shown in FIG. 3, both side edge portions 7a or 8a of the sheet (FIGS. 7 and 8).
The surface 4b facing the paper is formed so as to be away from the paper.

According to such a structure, since the escape portions 3a and 4a are formed in the upper guide 3 and the lower guide 4, as the paper, both side edges as shown in FIGS. Even if the thick laminated paper P3 or P4 that has been temporarily bound with a stapler or the like is sent, the resistance at both side edge portions does not increase, and therefore the paper is smoothly sent.

Since the escape portions 3a and 4a are formed at positions facing both side edge portions of the sheet to be fed, the other portions, that is, the central portions 3c and 4c, have the upper guide 3 and the lower guide 4 as before. The interval between and can be set small. Therefore, even when a sheet other than the laminated sheet is sent as the sheet, the sheet is accurately sent.

Further, in this paper feeding device, since the escape portions are formed in the upper guide 3 and the lower guide 4, as shown in FIG. 7, the bulging portion (protruding portion) 7d by the temporary binding is the upper and lower guides. It is possible to smoothly feed the paper on either side of the sheet, or as shown in FIG. 8, the paper having the bulged portions (protruding portions) 8d on both sides.

<Second Embodiment> FIG. 4 is a schematic view showing a second embodiment of the paper feeding apparatus according to the present invention. In this figure, the same or corresponding parts as those of the conventional device shown in FIG. 6 are designated by the same reference numerals.

The feature of this embodiment is that relief portions 3a 'and 4a' are formed in the upper guide 3'and the lower guide 4 ', respectively.

Similar to the first embodiment (see FIG. 2), the relief portion 3a 'of the upper guide 3'is provided at a position opposite to both side edge portions 7a or 8a (see FIGS. 7 and 8) of the sheet. The facing surface 3b 'facing the and is formed to be away from the paper.

Similarly to the first embodiment (see FIG. 3), the relief portion 4a 'of the lower guide 4'is also provided at the position facing the side edge portions 7a or 8a (see FIGS. 7 and 8) of the sheet. The facing surface 4b 'facing the and is formed so as to be away from the paper.

According to such a structure, since the escape portions 3a 'and 4a' are formed in the upper guide 3'and the lower guide 4 ', as a sheet, both sides as shown in FIGS. Even when the thick laminated paper P3 or P4 whose edges are temporarily bound with a stapler or the like is fed, the resistance at both side edges is not increased, and therefore the feeding is smoothly performed.

Since the escape portions 3a 'and 4a' are formed at the portions facing the both side edge portions of the sheet to be fed, the other portions, that is, the central portions 3c 'and 4c' are the upper guides 3'as before. The distance between the lower guide 4'and the lower guide 4'can be set small. Therefore, even when a sheet other than the laminated sheet is sent as the sheet, the sheet is accurately sent.

Further, in this paper feeding device, since the escape portions are formed in the upper guide 3'and the lower guide 4 ', FIG.
As shown in FIG. 8, even if the bulging part (protruding part) 7d by temporary binding is on either side of the upper and lower guides, or as shown in FIG. You can smoothly send even the paper in.

In the second embodiment, the paper feed path 6a for the cut sheet P1 is formed separately from the paper feed path 6b for the continuous paper P2. Therefore, the laminated paper may be supplied to the paper feed path 6a for the cut sheet P1. Therefore,
Also on the surface of the upper guide 3 ′ forming the paper feed path 6a,
By forming the relief portions 3d at positions facing both side edge portions of the paper, the laminated paper supplied to the paper feed path 6a can be smoothly fed. In this case, the platen 1 serves as an upper guide, and the upper guide 3 ′ serves as a lower guide.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various modifications can be appropriately made within the scope of the gist of the present invention.

For example, the relief portion may be provided only on one of the upper guide 3 and the lower guide 4. Even if it is provided only on one side, the bulging portion is released due to the bending of the paper, so that the laminated paper can be fed smoothly. When the escape portion is provided only on the upper guide 3, the bulging portion (protruding portion) 7d by temporary binding as shown in FIG. 7 is particularly suitable for feeding the paper on the upper guide 3 side. And lower guide 4
When it is provided only on the lower side, the bulging portion (protruding portion) 7d is particularly suitable for feeding the sheet on the lower guide side.

[0056]

According to the present invention, it is possible to smoothly feed a laminated paper in which both side edge portions are temporarily bound by a so-called paper stapler or the like.

[0057]

[Brief description of drawings]

FIG. 1 is a schematic view showing a first embodiment of a paper feeding device according to the present invention.

FIG. 2 is a perspective view mainly showing an upper guide portion.

FIG. 3 is a perspective view mainly showing a lower guide portion, showing a state in which a front side of the lower guide is removed.

FIG. 4 is a schematic view showing a second embodiment of the paper feeding device according to the present invention.

FIG. 5 is a schematic diagram showing a first example of a conventional device.

FIG. 6 is a schematic diagram showing a second example of a conventional device.

7A and 7B are views showing a first example of laminated paper, in which FIG. 7A is a partial plan view and FIG. 7B is a bb view in FIG.

FIG. 8 is a diagram showing a second example of laminated paper, (a) is a partial plan view, and (b) is a partial front view.

[Explanation of symbols]

 3 Upper guide 3a Relief 4 Lower guide 4a Relief

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masaki Shimomura 3-5 Yamato, Suwa City, Nagano Seiko Epson Corporation (72) Inventor Kazuhiko Yamaguchi 3-3-5 Yamato, Suwa City, Nagano Prefecture Seiko Epson Within the corporation

Claims (3)

[Claims] 1. A paper feeding device comprising an upper guide for guiding an upper surface of a sheet to be fed and a lower guide for guiding a lower surface of the sheet, wherein the upper guide is provided at a position facing both side edge portions of the sheet. A paper feeding device, characterized in that a relief portion whose surface facing the paper is distant from the paper is formed. 2. A paper feeding device comprising an upper guide for guiding an upper surface of a sheet to be fed and a lower guide for guiding a lower surface of the sheet, wherein the lower guide is provided at a position facing both side edge portions of the sheet. A paper feeding device, characterized in that a relief portion whose surface facing the paper is distant from the paper is formed. 3. A paper feeding device comprising an upper guide for guiding an upper surface of a paper to be fed and a lower guide for guiding a lower surface of the paper, wherein the upper guide and the lower guide face opposite side edge portions of the paper. A paper feeding device, characterized in that a relief portion is formed at a position where the surface facing the paper is distant from the paper.