JP4894573B2 - Paper feeder - Google Patents

Description

  The present invention belongs to the technical field of a sheet feeding device that feeds sheets one by one from the uppermost layer of a stack of sheets stacked on a sheet feeding plate.

FIG. 4 is a side view of this conventional sheet feeding device.
There is a suction conveyance means comprising a suction chamber 6 and a belt 7 at a position above the sheet bundle 5 loaded on the sheet feeding plate 4. An air suction hole (not shown) is provided on the lower surface of the suction chamber 6, and the lower surface is provided on the lower surface. A plurality of belts 7 that circulate along the belt are suspended at intervals, and the sheet sucked up by the air suction of the air suction holes appearing between the belts 7 and 7 is in close contact with the belt 7 to the right. And the leading end is sandwiched between the paper feed rollers 8 and discharged to the right.

  When air is sucked into the sheets, the sheets are fed one by one, so that the sheets in the upper layer of the sheet bundle 5 are separated one by one so that the sheets are sucked one by one. Thus, air is blown from the openings 15 of the plurality of air blowing portions 14 arranged to a portion near the uppermost layer of the front end of the sheet bundle 5 to prevent double feeding. Further, a part of the blown air is blown toward the leading edge of the paper adsorbed by the belt 7.

  This is because even if air is blown onto the uppermost layer at the front end of the sheet bundle 5, the sheet is not completely separated into one sheet over the entire surface. When the sheets are sucked up, the second and third sheets may be sucked up in close contact with the upper sheet. In order to prevent double feeding, air is blown toward the leading end position of the paper adsorbed on the belt 7, and even if two or three sheets are adsorbed on the belt 7, the air is shaken off. I am doing so.

FIG. 5 is a perspective view in which three air blowing portions 14 are arranged. In the two structures on the right side, both side walls 16 of the opening portion rise vertically and become halfway, rise again and become vertical. 18 is inclined upward toward the opening 15.
The opening 19 of the air blowing part at the left end has a shape with a hole in the vertical plate.
A shutter plate 17 is provided in front of the air blowing portion 14, and the opening amount of each opening portion can be adjusted in conjunction by moving the shutter plate connecting portion 20 in the arrow A direction.

FIG. 5 is a perspective view when the opening amount is large, and FIG. 6 is a perspective view when the opening amount is minimized.
The opening and closing of the shutter plate 17 is adjusted according to the paper quality. For example, when the paper is thick, it is opened widely, and when the paper is thin, it is adjusted in the closing direction (for example, see Patent Document 1).
JP 2002-226068 A (paragraphs [0048] to [0053], [0058], FIG. 4, FIG. 7, FIG. 8)

As described above, the air outlet faces the front side surface near the top of the stack of stacked sheets. For this reason, if there is a part where all or a part of the front end of the paper adsorbed by the adsorbing and conveying means is lowered from the lower surface of the belt, the lowered part is easily caught on the upper part of the vertical part of the air outlet and is likely to jam. There's a problem.
In addition, since the shutter plate that opens and closes the air blowing port stands vertically in accordance with the opening surface, there is a problem that the leading edge of the sheet is easily caught on the shutter plate as well as the air blowing port.

  In the present invention, in view of the above-described problems of the prior art, even if the leading edge of the paper is not completely sucked by the suction conveyance means, the leading edge of the paper may be caught by the air blowing port or the shutter plate, thereby causing a jam. It is an object of the present invention to provide a paper feeding device that does not include the above.

The present invention has the following configuration in order to solve the above problems.
A first configuration of the present invention is provided at an upper position of a sheet bundle stacked on a sheet feeding plate, and sucking and conveying means that sucks the sheets of the sheet bundle from above by air and conveys the sucked sheet in the sheet feeding direction. The opening surface of the air outlet is in the direction of paper travel so that air is blown toward the top end of the stack of stacked sheets in the transport direction and the section where the top of the paper is located when the paper is sucked by the suction transport means. A plurality of air outlets that are inclined in the width direction of the sheet bundle and a plurality of shutter plates that open and close the plurality of air outlets by moving in the width direction of the sheet bundle. Yes, and a sheet feeding apparatus in which each shutter plate is characterized in that to that upstanding sheet stacking direction, and those that are inclined along the opening surface of the air blowing port are mixed.

According to a second configuration of the present invention, in the first configuration, when the shutter plate inclined along the opening surface of the air blowing port is in its closed state, the blowing opening portion is entirely closed and opened. The sheet feeding device is characterized in that a part of the upper part is still open.

  In the first configuration of the present invention, since the opening surface of the air outlet is inclined in the paper traveling direction, even if the leading edge of the paper descending from the lower surface of the suction conveyance means contacts the opening, it is caught there. It has the effect of moving forward and not causing jams.

In addition, some of the plurality of shutter plates corresponding to the plurality of air outlets are inclined along the inclined opening surface of the air outlet, so that even if the leading edge of the paper comes into contact with the shutter plate, it is caught there. It has the effect of moving forward without causing jams.
Note that there is no need to incline the shutter plate at a position corresponding to a portion where the front end of the paper is not likely to sag when viewed in the width direction of the front end of the paper adsorbed by the suction conveyance means, so that inclination and upright are mixed. Become.

In the second configuration of the present invention, even if the shutter plate is closed in conjunction with the shutter plate, the upper part of the opening of some of the air outlets is still open. Air is blown toward the front end position of the paper adsorbed on the paper.
Therefore, it is not preferable to blow air on the uppermost layer at the front end of the sheet bundle because the sheet is thin. Even when the shutter plate is closed, a plurality of sheets are adsorbed on the lower surface of the adsorbing and conveying means. Has the effect of avoiding double feed by leaving one piece and dropping the other.

In the practice of the present invention, the shutter plate that opens and closes the air blowing port is not the simple switching between open and closed, but an opening / closing mechanism that can adjust the air blowing amount according to the paper quality and thickness of the paper. is there.
Further, the portion of the air outlet and the shutter plate that is in contact with the leading edge of the paper is best made of a material that makes the paper slippery or is subjected to a surface treatment that makes it slippery.

Hereinafter, an embodiment of a paper feeding device of the present invention will be described with reference to the drawings.
FIG. 1 is a side view of an embodiment of the paper feeding device of the present invention. 4 is different from the conventional paper feeder of FIG. 4 in the structure of the air blowing part 1, the opening part 2, and the shutter plates 3, 9, and 10. FIG. 2 is a perspective view of the air blowing portion 1, the opening portion 2, and the shutter plates 3, 9, and 10 extracted.
The opening 2 of the air blowing portion 1 has an opening surface obliquely upward. The roof plate 12 is inclined upward toward the sheet bundle 5.
As a result, the air blown out from the opening 2 is blown toward the vicinity of the uppermost layer at the front end of the sheet bundle 5 in FIG. 1 and the vicinity of the leading end position when the sheet is adsorbed to the belt 7.
In the shutter plate, the shutter plate 3 and the shutter plate 10 are bent and inclined in accordance with the inclination of the opening surface of the opening 2, and the shutter plate 9 is upright. Each of these shutters is connected by a shutter plate connecting portion 11, and the shutter plate connecting portion 11 can be moved in the direction of arrow A by a pinion rack 13 as shown in FIG.
FIG. 2 shows a state in which the shutter plates 3, 9, 10 are in the open position with respect to the air blowing portion 1, and FIG. 3 shows a state in which the shutter plate 3 is in the closed position.

In FIG. 3, the shutter plate 3 does not completely block the opening 2 of the air blowing part 1, and the upper part is open.
The air blown from here becomes upward, the air toward the sheet bundle 5 is suppressed, and the air is blown to the vicinity of the leading end portion of the sheet adsorbed by the belt 7.
Therefore, it is not preferable to blow air on the upper layer portion of the front end of the sheet bundle because the sheets of the sheet bundle 5 are thin, and even if the shutter plate is closed, air is blown to the leading end portion of the sheet that is in close contact with the belt 7 and thus heavy. You can avoid sending.

  Since the shutter plate 9 stands upright, the opening 2 is not directly blocked, but because the shutter plate 9 is blocked in front, the air blown toward the sheet bundle 5 is weakened, even if not as much as the shutter plate 3. Increasing airflow diagonally upward. Since the shutter plate 10 completely blocks the opening 2, no air is blown out at all.

  Thus, by tilting the opening surface of the opening 2, various shutter shapes can be adopted, which are the positions of the width of the suction conveyance means, the distance between the belts 7 and the size of the suction holes. Various selections are made according to the distribution of the adsorption force depending on the relationship and the quality and thickness of the paper to be handled.

It is a side view of the Example of this invention paper feeder. FIG. 2 is a perspective view of an air blowing unit and a shutter plate in the open state in the paper feeding device of FIG. 1. FIG. 2 is a perspective view of an air blowing unit and a shutter plate in a closed state in the paper feeding device of FIG. 1. It is a side view of the conventional paper feeder. FIG. 5 is a perspective view of an air blowing portion and an open shutter plate of the sheet feeding device of FIG. 4. FIG. 5 is a perspective view of an air blowing portion and a closed shutter plate of the sheet feeding device of FIG. 4.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Air blowing part 2 Opening part 3 Shutter board 4 Paper feeding board 5 Paper bundle 6 Suction chamber 7 Belt 8 Paper feed roller 9 Shutter board 10 Shutter board 11 Shutter board connection part 12 Roof board 13 Pinion rack 14 Air blowing part 15 Opening part 16 Side wall 17 Shutter plate 18 Roof plate 19 Opening 20 Shutter plate connecting part

Claims (2)

A suction conveying means provided above the sheet bundle stacked on the sheet feeding plate, which sucks the sheets of the sheet bundle with air from above and sucks the sheets in the sheet feeding direction, and the conveyance direction side of the loaded sheet bundle The opening direction of the air outlet is inclined in the paper traveling direction so that air is blown toward the upper tip part and the part where the leading edge of the paper is located when the paper is sucked by the suction conveyance means. along with an air outlet provided plurality, by moving in the width direction of the sheet bundle, have a plurality of shutter plates for opening and closing the plurality of air outlet in conjunction, each shutter plate is paper loading A sheet feeding device characterized by a mixture of ones standing upright in the direction and ones inclined along the opening surface of the air outlet . When the shutter plate that is inclined along the opening surface of the air outlet is in its closed state, the shutter plate that completely closes the opening of the air outlet and the upper part of the opening are still open The sheet feeding device according to claim 1, wherein the sheet feeding device is mixed.

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