JPH0572842U - Automatic paper feeder - Google Patents

Abstract

(57) [Summary] [Purpose] It is an object of the present invention to realize an automatic paper feeder having high operation reliability by preventing double feeding of thin paper or weak paper. [Structure] A pair of sheet guides 3 that slide in correspondence with the width of a sheet, and a sheet receiving portion 11 that abuts on the leading end portion of the sheet set between the pair of sheet guides 3 are provided by the sheet receiving portion 11. Sheet support for holding paper 10
And a hopping roller 4 that feeds out the sheet that comes into contact with the uppermost portion of the sheet and is rotationally driven, and an urging member that urges the sheet guide 3 toward the hopping roller 4 side to press the set sheet against the hopping roller. Means (spring 5) and abutting portion 7 for abutting both ends of the leading edge of the paper
And a nail 6 for separating one sheet of paper fed out by the hopping roller 4 by the abutting portion 7, the paper receiving portion 11 of the sheet support 10 being made of a thin elastic material. It consists of.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an automatic paper feeder that is mounted on a printer or the like for use.

[0002]

[Prior Art]

 FIG. 2 is a perspective view showing a conventional example of this type of automatic sheet feeder. 3 and 4 are side sectional views of the main part showing the conventional example, and also show the problems of the conventional example. In the figure, 1 is a sheet, and 2 is a base plate on which the sheet 1 is set, and is rotatable around a rotation fulcrum A. Sheet guides 3a and 3b are mounted on the base plate 1 so as to be slidable left and right, and slide according to the width of the sheet 1 set on the base plate 2.

Reference numeral 4 denotes a hopping roller, which rotates in the direction of arrow B by a drive source (not shown) to send out the paper 1. Reference numeral 5 shown in FIGS. 3 and 4 denotes a spring included in the sheet guides 3a and 3b, which presses the set sheet 1 against the hopping roller 4. Reference numerals 6a and 6b denote abutting portions 7a and 7b for abutting both ends of the leading edge of the sheet, which are nails for separating the sheet fed by the hopping roller 4 by the abutting portions 7a and 7b. The sheet guides 3a and 3b are mounted rotatably around a rotation fulcrum C.

Reference numeral 8 is a sheet support, and 8a is a paper receiving portion formed by bending the front portion of the sheet support 8, and the paper receiving portion 8a is in contact with the end portion of the paper between the sheet guides 3a and 3b. Hold this. The seat support 8 also serves as a seat for the spring 5. Therefore, the seat support 8 is made of a strong iron plate. With the above configuration, in the above-described conventional example, the sheet 1 on the sheet guides 3a and 3b pushed up by the spring 5 by the rotation of the hopping roller 4 advances in the rotation direction of the hopping roller 4 and becomes nails 6a and 6b. After hitting, the both ends of the topmost sheet of the sheet 1 set by the nail nails 6a and 6b were buckled, separated from other sheets, and supplied to the printer.

[0005]

[Problems to be solved by the device]

 However, in the prior art having the above-described structure, as shown in FIG. 3, since there is a gap d in the paper traveling direction between the paper abutting portions 7a and 7b of the nails 6a and 6b and the tip portion 8b of the sheet support 8, the paper feed hopping is performed. When the roller was rotated, the set paper 1 was misaligned with the leading end 8b of the sheet support 8 as a boundary. Then, since the both ends of the sheet 1 are buckled and fed by the nails 6a and 6b, when the sheet feeding is repeated in the state of FIG. 3, the position where the layer shift is formed as shown in FIG. Until then, as the paper supply progresses, if the paper is thin or stiff, the edges of the paper may get into the space between the nails 6a and 6b and the sheet support 8 when the top and misaligned paper becomes a few sheets. Attempting to do so, there was a problem in that all of the upper sheets that were misaligned were more likely to buckle, and double feeding would easily occur.

In view of the above problems, the present invention obtains a configuration for preventing layer misalignment of set papers, prevents frequent feeding of thin papers or weak papers, and provides automatic feeding with high operation reliability. The purpose is to realize a paper device.

[0007]

[Means for Solving the Problems]

 To achieve the above object, the present invention minimizes the gap between the paper abutting portion of the nail and the paper edge receiving portion of the sheet support. That is, the present invention has a pair of sheet guides that slide corresponding to the width of a sheet, and a sheet receiving portion that abuts on the leading edge of the sheet set between the pair of sheet guides. A sheet support that holds the sheet, a hopping roller that comes into contact with the top of the sheet and feeds the sheet that is rotationally driven, and a sheet that is set by urging the sheet guide toward the hopping roller. Automatic paper feed having a biasing means for pressing the sheet, and a nail having a butting portion for butting both ends of the leading edge of the paper, and separating the one sheet fed by the hopping roller by the butting portion. In the apparatus, the sheet receiving portion of the sheet support is made of a thin elastic material.

[0008]

[Action]

 With the above structure, according to the present invention, when the sheet is set between the pair of sheet guides and held by the sheet support, since the sheet receiving portion of the sheet support is made of the elastic member, it flexes and the nail abutting portion and the sheet support are bent. The gap with the leading edge of the paper is only the thin thickness of the paper receiving part.

Further, by tilting the paper receiving surface of the paper edge, it is possible to keep the paper separated when the paper is set.

[0010]

【Example】

 Embodiments will be described below with reference to the drawings. FIG. 1 is a side sectional view of an essential part showing an embodiment of the present invention. In the figure, 1 is a sheet, and 3 is a pair of sheet guides mounted on a base plate (not shown) so as to be able to slide left and right, and slides corresponding to the width of the sheet 1. The structure of the sheet guide 3 is the same as the conventional one shown in FIG.

Reference numeral 4 denotes a hopping roller, which rotates in the direction of arrow B by a drive source (not shown) to send out the paper 1. Reference numeral 5 denotes a spring included in the sheet guide 3, which presses the set sheet 1 against the hopping roller 4. The configurations of the hopping roller 4 and the spring 5 are the same as those of the conventional one shown in FIG. Reference numeral 6 denotes a nail which has a butting portion 7 for butting both ends of the leading edge of the paper, and which separates one sheet of the paper 1 fed by the hopping roller 4 by the butting portion 7. The construction is similar to that of the conventional one shown in FIG. 2, that is, a pair of left and right nails 6 are provided and mounted on the seat guide 3 rotatably around a fulcrum not shown.

Reference numeral 10 denotes a sheet support, 11 denotes a sheet receiving portion formed of a thin elastic member welded to the sheet support 10, and the sheet receiving portion 11 contacts an end portion of the sheet 1 between the pair of sheet guides 3. Hold this. The seat support 10 also serves as a seat for the spring 5. The operation of the present embodiment having the above configuration will be described below.

First, when the sheet guide 3 is first pushed down to set the sheet 1, the sheet receiving portion 11 formed of a thin elastic member bends and inclines with respect to the sheet end surface. Therefore, the leading edge of the sheet is held in a state where the entire sheet is fanned. Further, due to the bending of the sheet receiving portion 11, the gap between the abutting portion 7 of the nail 6 and the front end portion 10a of the sheet support 10 becomes only the thin plate thickness of the sheet receiving portion 11. Therefore, when the sheet guide 3 is released and the paper 1 is pressed against the hopping roller 4 by the force of the spring 5, the tip of the topmost sheet of the set paper 1 is brought into contact with the abutting portion 7 of the nail 6. Reach As a result, when the hopping roller 4 rotates to try to send out the sheet 1, the layer misalignment of the sheet 1 does not occur.

[0014]

[Effect of the device]

 As described in detail above, according to the present invention, a pair of sheet guides that slide in correspondence with the width of the sheet and a sheet receiving portion that abuts on the leading end of the sheet set between the pair of sheet guides are provided. Then, a sheet support that holds the sheet by the sheet receiving portion, a hopping roller that abuts the uppermost portion of the sheet by rotational driving, and a sheet guide that biases the sheet guide toward the hopping roller side. A urging means for pressing the set sheet against the hopping roller, and a nail for abutting both ends of the sheet, and a nail for separating one sheet of the sheet fed by the hopping roller by the abutting section. In the automatic paper feeding device equipped with, since the paper receiving portion of the sheet support is made of a thin elastic material, the paper abutting portion of the nail and the paper edge of the sheet support are Gap of only part is minimized.

As a result, it is possible to prevent the misalignment of the set sheets, prevent the double feeding of thin sheets or sheets with weak stiffness, and realize an automatic sheet feeding apparatus with high operation reliability. is there.

[Brief description of drawings]

FIG. 1 is a side sectional view of an essential part showing an embodiment of the present invention.

FIG. 2 is a perspective view showing a conventional example.

FIG. 3 is a side sectional view of a main part of a conventional example.

FIG. 4 is a side sectional view of a main part of a conventional example.

[Explanation of symbols]

 1 paper 3 sheet guide 4 hopping roller 5 spring 6 nail 7 abutting part 10 sheet support 11 paper receiving part

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shigemi Togashi 1-7-12 Toranomon, Minato-ku, Tokyo Oki Electric Industry Co., Ltd.

Claims (1)

[Scope of utility model registration request] 1. A pair of sheet guides that slide in correspondence with the width of the sheet, and a sheet receiving portion that abuts on the leading end portion of the sheet set between the pair of sheet guides. A sheet support for holding, a hopping roller that comes in contact with the uppermost portion of the paper and feeds the paper that comes into contact by rotational driving, and a sheet guide that urges the sheet guide toward the hopping roller to press the set paper into pressure contact with the hopping roller. An automatic paper feeding device comprising: a biasing unit; and a nail that has both abutting portions for abutting both ends of a sheet and that separates one sheet of paper fed by a hopping roller by the abutting portion, An automatic paper feeder, characterized in that the paper receiving portion of the sheet support is made of a thin elastic material.