JP4421411B2 - Paper feeder - Google Patents

Description

  The present invention relates to a sheet feeding device that feeds a large number of stacked sheets such as cardboard sheets one by one from the lowest sheet to a sheet processing section in the next process.

  A number of cardboard sheets (hereinafter referred to as “sheets”) are stacked in the sheet supply unit, and a sheet processing unit or sheet is provided on the downstream side one by one from the lowest sheet by a sheet feeding device provided below the stacked sheets. 2. Description of the Related Art Conventionally, a paper feeder that feeds an inspection unit (hereinafter referred to as a sheet processing unit) is known.

  In the sheet feeding device as described above, when the stacked sheets are in close contact with each other, the entire weight of the stacked sheets acts on the lowermost sheet, and the lowermost sheet is fed out by the sheet feeding device. The resistance of the sheet is large, and there is a possibility that a mistake in feeding the sheet occurs or the sheet is damaged.

In order to eliminate such inconvenience, as described in Patent Document 1, in the sheet supply unit, an inner surface of a back guide that forms a stacking sheet storage unit with a front guide that positions the front edge of the sheet A tapered surface is provided on the upper portion so that the distance between the front guide and the front guide increases, and a plurality of sheets are accommodated in a stacked state in a sheet accommodating portion below the lower end of the tapered surface, and continued on the stacked sheets. The rear end of the sheet is supported by the taper surface of the back guide and held in an inclined shape, and every time the lowermost sheet of the stacked sheets stacked in the lower part of the sheet storage unit is fed into the sheet processing unit The sheets are stacked in order on the lowest sheet of the sheet container so that the lowermost sheet of the sheet group held in an inclined manner is dropped downward in order. So that the total weight of the door is not applied.
JP-A-60-36246

  By the way, in the sheet feeding device described in Patent Document 1, since the lowest sheet of the stacked sheets stored in the sheet storage portion does not receive the total weight of the stacked sheets over the entire upper surface, the sheet movement resistance Is relatively small and can be smoothly fed out in order from the lowest sheet, but because the total weight of the stacked sheets is acting on the leading edge of the lowest sheet, the lowest sheet and the next The frictional resistance between the leading edges of the sheet is extremely large, and when the lowest sheet is fed out, the next sheet above is dragged together by the frictional resistance and is caught in the gap formed below the front guide. There was a risk that it would be inserted or two sheets would be sent.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a sheet feeding device capable of preventing the next subsequent sheet from being dragged out when the lowermost sheet of the stacked sheets is fed out.

In order to solve the above-mentioned problems, in the present invention, the front edge is positioned by the front guide, and a large number of stacked sheets whose rear edges are guided by the back guide are placed at the lowest position by the sheet feeding device provided below the stacked sheets. in the sheet feeding apparatus that feeds the downstream side one by one in order from the sheet, the bottom of the facing surface to the back guide of the front guide, a first tapered surface you inclined obliquely in the opposite direction to the feeding direction of the sheet And forming a second taper surface that is continuous with the lower end of the first taper surface and that inclines in the opposite direction with respect to the first taper surface, and is stacked below the front surface of the back guide facing the front guide. A sheet support for supporting a plurality of sheets following a plurality of sheets at a lower part of the sheet in an inclined manner with a downward slope toward the front edge with the second tapered surface. Forming a surface, it was adopted a structure in which smaller than the inclination angle with respect to the vertical plane of the second tapered surface inclination angle with respect to the vertical plane of the sheet supporting surface.

As described above, the second tapered surface that is inclined in the opposite direction with respect to the first tapered surface is formed continuously from the lower end of the first tapered surface formed on the front guide, and the front of the back guide is formed. Forming a sheet support surface for supporting a plurality of sheets following a plurality of sheets at the bottom of the stacked sheet on the lower surface facing the guide in an inclined manner with a downward slope toward the front edge with the second tapered surface The weight of the sheet loaded on the leading edge of the lowermost sheet of the stacked sheets can be further reduced, and when the lowermost sheet is fed out, the next sheet above it is almost dragged out. It can be completely prevented.

  As described above, by forming a tapered surface on the front guide and supporting the next sheet following the plurality of sheets at the bottom of the stacked sheet with the tapered surface and the back guide, Since only the weight of a plurality of sheets acts on the edge, the frictional resistance acting on the contact portion between the lowest sheet and the next sheet following it is small, and the lowest sheet is sent downstream. This prevents the next sheet from being dragged out.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIGS. 1 and 2, the front guide 1 has a plate shape, and a back guide 2 is provided to face the front guide 1. The back guide 2 forms a sheet storage portion 3 between the back guide 2 and a stacked sheet S _{0 in} which a large number of sheets S ₁ are stacked is stored in the sheet storage portion 3.

A lower surface of the front guide 1 facing the back guide 2 is provided with a first taper surface 4 and a second taper surface 5 continuous to the lower end of the first taper surface 4. The tapered surface 4 is inclined in the direction opposite to the feeding direction of the sheet S ₁ , while the second tapered surface 5 is inclined in the feeding direction of the sheet S ₁ and inclined in the direction opposite to the first tapered surface 4. It has become.

The position of the back guide 2 is adjusted back and forth in accordance with the size of the sheet S ₁ stored in the sheet storage unit 3 by a positioning device 7 provided on the paper feed table 6.

An interval is provided between the lower end of the back guide 2 and the upper surface of the paper feed table 6 so that the lower sheet block B ₁ composed of a plurality of stacked sheets S ₁ can be accommodated.

  An inclined seat support surface 8 is provided below the surface of the back guide 2 facing the front guide 1. The seat support surface 8 is inclined in the same direction as the second tapered surface 5 provided at the lower end portion of the front guide 1, and the inclination angle with respect to the vertical surface is smaller than that of the second tapered surface 5.

The seat support surface 8 supports the rear ends of the plurality of sheets S ₁ continuing on the lower seat block B ₁ accommodated below the back guide 2 and is between the second tapered surface 5 of the front guide 1. The intermediate sheet block B ₂ made up of a plurality of sheets S ₁ stacked in the above manner is accommodated.

Back guide 2 upper than the seat supporting surface 8 bent toward the front guide 1 to be inclined in the same direction as the first tapered surface 4, the upper sheet S at its upper end continues to the intermediate section seat block B ₂ supporting the trailing edge of the _1, thereby forming a gap between the intermediate portion seat block B _2.

The lower front guide 1, the sheet feeding apparatus 10 for feeding to the downstream side in order to stack the sheet S ₀ accommodated in the sheet accommodating portion 3 from the lowermost sheet S ₁ one by one is provided.

The sheet feeding apparatus 10 includes a sheet feeding belt 11 having a large number of small holes 12 formed over its entire length, and a suction box 13 provided below the carrier side belt 11 a of the sheet feeding belt 11. A slit 15 that is elongated in the sheet conveying direction is formed in the belt support plate 14 that supports the carrier side belt 11a, and the internal pressure is maintained at a pressure lower than the atmospheric pressure by the exhaust in the suction box 13, so The lowermost sheet S ₁ is adsorbed by the suction force applied to the hole 12, and the lowermost sheet S ₁ is sent downstream by the movement of the paper feeding belt 11 in the direction of the arrow shown in FIG.

Here, a gap 16 is formed between the carrier side belt 11a of the paper feeding belt 11 and the lower end of the front guide 1, and the gap 16 is sized so that _one sheet S1 can pass through.

  The sheet feeding apparatus 10 is not limited to the above. For example, as described in Japanese Patent Application Laid-Open No. 2002-362761, a plurality of feed rollers are provided in an upper opening of a suction box provided below a stacked sheet, and the internal pressure in the suction box is changed from atmospheric pressure. It may be a sheet feeding device which is held at a low pressure and applies suction force to the lowermost sheet and is brought into pressure contact with a plurality of feeding rollers, and the lowermost sheet is fed downstream by rotation of the feeding roller. .

Movement resistance imparting means 20 for imparting movement resistance on the lower surface rear end portion of the sheet S ₁ of the lowest stack sheet S ₀ is provided to the lower back guide 2.

Here, a friction roll 21 is employed as the movement resistance applying means 20. The friction roll 21 is arranged in contact with the lower surface of the lowermost sheet S ₁ , and the sheet is rotated by rotating the friction roll 21 in the direction opposite to the feeding direction of the sheet S ₁ (rotation in the direction indicated by the arrow in FIG. 2). so that to grant the transfer resistance to S _1.

Here, the movement resistance by the friction roll 21 is smaller than the sheet conveying force by the sheet feeding device 10 and larger than the frictional resistance acting on the contact surface between the lowest sheet S ₁ and the upper sheet S ₁ that follows.

The sheet feeding device shown in the embodiment has the above-described structure. When a large number of sheets S ₁ are stored in a stacked state in the sheet storage portion 3 formed between the front guide 1 and the back guide 2, the lowest sheet S is stored. with ₁ of the front edge is supported by the carrier side belt 11a of the paper feeding belt 11, after the lower surface rim portion is supported by the friction roll 21, the sheet S ₁ several sheets on the sheet S ₁ of the lowest It is a stacked state to form a lower seat block B _1.

In the next sheet S ₁ following the lower seat block B ₁ , the leading edge is positioned by the second tapered surface 5 of the front guide 1 and the trailing edge is supported by the sheet supporting surface 8 of the back guide 2. The sheet S ₁ is supported in an inclined manner, and several sheets S ₁ are stacked and supported on the sheet S ₁ to form an intermediate sheet block B ₂ .

Further, the next sheet S ₁ following the intermediate seat block B ₂ is inclined with the leading edge supported by the first tapered surface 4 of the front guide 1 and the trailing edge supported by the upper end of the back guide 2. Jo is held, is a number of stacked state sheet S ₁ on the sheet S _1, forming the upper sheet block B _3.

Thus, when a large number of sheets S ₁ are stored in the sheet storage portion 3 in a stacked state, these sheets S ₁ are divided into a lower seat block B ₁ , an intermediate seat block B _2, and an upper seat block B _3. The leading edges of the lowermost sheets S ₁ of the stacked sheets S ₀ because the leading edges of several sheets S ₁ on the lower side of the sheet block B ₃ are supported by the first tapered surface 4 formed on the front guide 1. However, the weight of the upper seat block B ₃ is hardly loaded, and only the weight of several sheets S ₁ of the lower seat block B ₁ and the middle seat block B ₂ is loaded.

For this reason, only the weights of the lower seat block B ₁ and the intermediate seat block B ₂ act slightly on the contact portion of the lowermost sheet S ₁ and the front edge portion of the sheet S ₁ that follows the lowest seat S _1. Thus, the frictional resistance of the contact portion is extremely small.

Accordingly, when the lowest sheet S ₁ of the stacked sheets S ₀ is fed downstream from the gap 16 formed below the front guide 1 by the sheet feeding device 10, the next sheet in contact with the lowermost sheet S ₁ is contacted. The sheet S ₁ is not dragged out, and only the lowest sheet S ₁ can be smoothly sent out downstream.

Here, when the lowermost sheet S ₁ is slightly fed downstream from the gap 16 formed between the lower end of the front guide 1 and the carrier side belt 11 a of the paper feeding belt 11, and the rear end thereof is separated from the friction roll 21, As shown in FIG. 2, the rear end of the lower surface of the next sheet S ₁ following the lowermost sheet S ₁ comes into contact with the friction roll 21, and movement resistance is given to the next sheet S ₁ . Since this movement resistance is larger than the frictional resistance acting on the contact surface with the lowermost sheet S ₁ , the next sheet S ₁ is dragged toward the lowermost sheet S ₁ toward the gap 16 below the front guide 1. It is prevented from moving.

For this reason, it is possible to prevent the trouble that the next sheet S ₁ is caught in the gap 16.

When the sheet feeding device 10 is operated to sequentially feed the sheet S ₁ downstream one by _one from the lowest sheet S ₁ of the stacked sheet S ₀ , the lowermost sheet of the intermediate sheet block B ₂ is sent each time the sheet S ₁ is fed. S ₁ falls downward to become the sheet S ₁ of the lower seat block B ₁ , and the lowermost sheet S ₁ of the upper seat block B ₃ following the middle seat block B ₂ falls downward. to become a sheet S ₁ of the intermediate portion seat block B _2, the number of sheets S ₁ of the lower seat block B ₁ and the intermediate section seat block B ₂ will always be held constant.

For this reason, only the weights of the several sheets S ₁ forming the lower sheet block B ₁ and the intermediate sheet block B ₂ act on the leading end of the lowest sheet S ₁ of the stacked sheets S _0. it is possible to prevent double feed of S _1.

A longitudinal front view showing an embodiment of a paper feeder according to the present invention Enlarged sectional view showing a state where the lowest sheet is being sent out

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Front guide 2 Back guide 4 1st taper surface 5 2nd taper surface 8 Sheet support surface 10 Sheet feeding apparatus

Claims (1)

A large number of stacked sheets whose front edge is positioned by the front guide and whose rear edge is guided by the back guide are fed one by one downstream from the lowest sheet by the sheet feeding device provided therebelow. in the paper system, the bottom of the facing surface relative to the front guide back guide, a first tapered surface you inclined obliquely in the opposite direction to the feeding direction of the sheet, in succession to the lower end of the first tapered surface that A plurality of sheets that form a second tapered surface inclined in the opposite direction with respect to the first tapered surface, and that continue on the plurality of sheets at the bottom of the stacked sheets at a lower portion of the back guide facing the front guide Forming a sheet support surface that supports the second taper surface with a downward slope toward the front edge, and the sheet support surface is inclined with respect to the vertical surface. Sheet feeding apparatus, wherein a corner made smaller than the inclination angle with respect to the vertical plane of the second tapered surface.

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