JP2005145662A - Paper feeding device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a paper feeding device having an air blow means for continuously varying an air blow direction by a simple means dispensing with driving force. <P>SOLUTION: A rotary blade 2a is attached on a rotating shaft 3a attached in an air blow chamber 1a by a support member 4, the rotary blade 2a is rotated by the air flow fed from the upstream direction of the air blow chamber 1a, the wind having the air blow direction from an air blow opening 20a continuously varied is made by the rotation, the wind is abutted to a sheet bundle, and thereby the sheets are surely separated one by one, the separated sheet is sucked to a porous belt 11 by suction force of an air suction chamber 10, and is conveyed to a slip plate 12, a roller 13, and a roll 14. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention belongs to the technical field of a sheet feeding device that feeds sheets one by one from a stacked sheet bundle.

  Conventionally, in this type of paper feeding apparatus, in order to reliably feed one sheet at a time without overlapping sheets, the sheets are separated by blowing air onto the sheet bundle, and the separated uppermost sheet is removed. Adsorption is performed by an adsorption mechanism and is sent out.

  In order to reliably separate the sheets one by one regardless of the thickness and material of the sheets, it is known that the wind applied to the sheet bundle is preferably a turbulent wind whose blowing direction changes continuously rather than a constant wind. It has been.

  One way to generate turbulent wind is to open many air outlets parallel to the axis and open the air holes inside the outer cylinder fixed to the sheet bundle, and also open many air outlets parallel to the axis. The inner cylinder is inserted, one end of the inner cylinder is closed, wind is sent from the other end, the inner cylinder is rotated by a drive mechanism, and a so-called air pulse is blown out from the air outlet of the outer cylinder. (For example, refer to Patent Document 1).

As another method of generating turbulent wind, a method is used in which an electromagnetic valve is inserted in the middle of a pipe that sends wind and an intermittent wind is generated by electrically opening and closing the valve (for example, patent document). 2).
Japanese Utility Model Publication 51-14479 (Fig. 2) JP-B 51-30800 (Fig. 3)

  The problem to be solved by the present invention is that, in the above-described conventional paper feeding device, a turbulent wind generating mechanism uses a motor that rotates the inner cylinder and an electromagnetic valve that opens and closes the tube port, so that these are driven. In order to solve this problem, there is a problem in that it requires power and a drive circuit to perform the operation, requires space and members for that purpose, and increases the cost. An object of the present invention is to provide a sheet feeding device having a blowing means whose direction changes.

According to a first aspect of the present invention, there is provided a sheet feeding device including the following units.
(B) Sheet bundle placement table on which sheets are stacked and placed (b) The sheet bundle is sent from upstream to the upstream side of the air blowing port for blowing air toward the position where the upper layer portion of the sheet bundle placed on the sheet bundle placement table comes A rotating blade that rotates by the air flow, and continuously rotates the air blowing direction from the air blowing port by the rotation. (C) The sheet lifted by the air blowing from the air blowing device is adsorbed and sent in the paper feeding direction. Sheet suction and delivery means

  In the second configuration of the present invention, instead of the air blowing means of the first configuration, flutter vibration is supported by an air flow that is supported on a transverse axis with respect to the air flow on the upstream side of the air blowing port and sent from the upstream side. The paper feeding device includes a oscillating blade that causes the air flow to continuously change the air blowing direction from the air blowing port by the flutter vibration.

  According to a third configuration of the present invention, in the first or second configuration, the sheet suction and delivery unit includes a decompression chamber having an air suction opening, and a suction conveyance belt that moves the lower portion of the air suction opening in the sheet feeding direction. A sheet feeding device comprising:

  According to a fourth configuration of the present invention, in the first, second, or third configuration, an ascending control unit that controls the sheet bundle mounting table to rise in accordance with a decrease in the sheet bundle height due to the progress of sheet feeding. A sheet feeding device characterized by comprising:

  The sheet feeding device according to the present invention uses, as a means for changing the direction of the air flow to be blown to the sheet bundle, a conventional motor or electromagnetic valve and a very simple air blowing mechanism that does not require power for driving them. It has the effect of stable quality, low cost and high reliability.

Paper feeding devices are required to feed one sheet at a time without any overlap feeding without adjusting each time, even if the size, thickness, and material of the sheet to be used vary. Machines, copiers, and the like have been speeded up, and paper feeders used for them are required to be speeded up. A simple mechanism is desired for such a highly reliable sheet feeding apparatus that operates at high speed.
For this reason, it is best that the air blown on the sheet bundle is directed to the upper layer portion of the placed sheet bundle and is blown over the entire sheet width.

  In addition, the change in the direction of the air blowing is best changed in the vertical angle direction from the viewpoint of separating the overlapping contact of the sheets. However, the effects of the present invention cannot be obtained just because components in other directions are mixed.

  Further, the sheet suction / delivery means needs to be sucked after the first sheet is sucked and conveyed, and its leading edge is caught by the next-stage conveyance means (for example, a roller that conveys the sheet from above and below). Since there is no pressure, the decompression of the decompression chamber is released, and the decompression is resumed after passing through the rear end of the first sheet or the air suction opening of the decompression chamber, thereby enabling smooth and reliable feeding. Become.

  Further, in the ascending control means, the top position of the sheet bundle is kept at a position where the sheets are most easily separated one by one with respect to the air blown from the air blowing means. The sheet can be separated in the best condition by providing a photodetector comprising a light receiving element and keeping the uppermost part of the sheet bundle at a position where the light beam is cut off.

FIG. 1 is a structural diagram showing the structure of the first embodiment of the paper feeding device of the present invention. 1A is a side cross-sectional view, and FIG. 1B is a view taken along the arrow A of the blower chamber 1a in FIG.
The sheet bundle S0 is placed on the sheet bundle placing table 5, and the uppermost position of the sheet bundle S0 is always set by the upper surface detection light sensor 7, the elevation control unit 8, and the lifting mechanism 6 in the blower opening of the blower chamber 1a (in FIG. 1). It is controlled so as to match the position of the right side of the blower chamber 1a.

  A rotary blade 2a is mounted on a rotary shaft 3a attached by a support member 4 inside the blower chamber 1a, and the rotary blade 2a is rotated by an air flow (arrow B) sent to the blower chamber 1a. The air flow (arrow B) sent from the upstream (the left end of the blower chamber 1a in FIG. 1) due to the rotation of the rotating blades 2a becomes a turbulent wind whose blowing direction continuously changes, and the air flow of the blower chamber 1a is changed. It blows out from the blower opening 20a.

  The rotating blade 2a in FIG. 1B is depicted as a propeller, but is not limited to such a shape, and a rotational moment is generated when an axial air flow is received. The number of blades is not particularly limited to two as long as it has an inclination or a bend.

  In this way, the turbulent wind in which the blowing direction blown out from the blower port 20a is continuously blown is blown to the upper layer portion of the sheet bundle S0, and the sheets are separated and floated one by one (FIG. 1). S1 state).

  An air suction chamber 10 having a suction opening 9 has a perforated belt 11 moving through the opening, and a single sheet floating is perforated by the suction force of the suction opening 9 through a number of holes in the perforated belt 11. 11 is in close contact (state S2 in FIG. 1).

When the end of the sheet (left end in FIG. 1) that has been sucked through the suction opening 9 and moved in close contact with the perforated belt 11 passes through the suction opening 9, the end of the sheet is peeled off from the perforated belt 11 and slides on the sliding plate 12, and the roller 13 and the roller 14 (state of S3 in FIG. 1).
In place of the perforated belt 11, thin belts may be arranged in parallel at intervals.

FIG. 2 is a structural diagram showing the structure of a blower chamber using swing blades of the second embodiment of the paper feeding device of the present invention. FIG. 2A is a perspective view of a blower chamber 1b, and FIG. 2B is a side sectional view.
A blower chamber 1b shown in FIG. 2 is attached in place of the blower chamber 1a in the structural diagram of the paper feeder of the first embodiment shown in FIG. 1 to constitute a paper feeder.

  Inside the blower chamber 1b, a swinging blade 2b is mounted on a rotating shaft 3b attached so as to cross the blower passage of the blower chamber 1b. Due to the air flow (arrow B) sent from the upstream direction of the blower chamber 1b, the swing blade 2b causes flutter vibration as shown by the broken line in FIG. 2 (b). The air flow (arrow B) sent by the flutter vibration of the oscillating blade 2b is blown out from the blowing port 20b of the blowing chamber 1b as a turbulent wind whose blowing direction continuously changes.

The oscillating blade is not limited to a flat plate shape, and may have a curved surface, and any material may be used as long as it has a property of causing flutter vibration by the air flow from the air blowing port 20b. good.
In this way, a turbulent wind whose blowing direction blows out from the blower opening 20b is continuously blown to the upper layer portion of the sheet bundle S0, and the sheets are separated one by one as in the first embodiment. .

1 is a structural diagram illustrating the structure of a first embodiment of a paper feeder according to the present invention. FIG. 6 is a structural diagram illustrating a structure of a second embodiment of a paper feeding device according to the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1a Blower chamber 1b Blower chamber 2a Rotating blade 2b Oscillating blade 3a Rotating shaft 3b Rotating shaft 4 Support member 5 Sheet bundle mounting table 6 Elevating mechanism 7 Upper surface detection light sensor 8 Lift control unit 9 Suction opening 10 Air suction chamber 11 Porous belt 12 Sliding plate 13 Roller 14 Roll 20a Blower 20b Blower S0 Sheet bundle

Claims (4)

A paper feeding device comprising the following means.
(B) Sheet bundle placement table for stacking and placing sheets A rotating blade that rotates by the air flow, and continuously rotates the air blowing direction from the air blowing port by the rotation. (C) The sheet lifted by the air blowing from the air blowing device is adsorbed and sent out in the paper feeding direction. Sheet suction and delivery means   (B) Instead of the air blowing means of claim 1, on the upstream side of the air blowing port, there is a swinging blade that is supported by a transverse axis with respect to the air flow and causes flutter vibration by the air flow sent from the upstream, A sheet feeding device comprising a blowing unit that continuously changes a blowing direction from a blowing port by flutter vibration.   3. A sheet feeding apparatus according to claim 1, wherein the sheet suction / feeding means comprises a decompression chamber having an air suction opening and a suction conveyance belt which moves the lower portion of the air suction opening in the sheet feeding direction. . 4. A sheet feeding apparatus according to claim 1, further comprising an ascending control means for controlling the sheet bundle mounting table so as to rise in accordance with a decrease in sheet bundle height due to the progress of sheet feeding. apparatus.

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