JPS63143131A - Paper feeder - Google Patents

Abstract

PURPOSE:To surely feed paper from the uppermost position, by conveying the paper, fed out by a pusher roller, by a picker roller and a reverse roller pressing the paper to be put therebetween and providing an attracting device in the picker roller of these picker and reverse rollers so as to attractively attach the paper. CONSTITUTION:Many papers 1, mounted on a loading part 2, are fed out from an upper part by a pusher roller 3. The fed out paper 1, which is pressed interposing between a picker roller 5, turning in a direction B, and a reverse roller 4 turning in a direction C, is fed out in the direction of an arrow head D. The picker roller 5 provides rollers 14a, 14b in both sides of a spacer 11, having an attracting port 15 and a discharge port 16, to be secured to a driving shaft 13 and turned, and the spacer 11, forming its diameter a little smaller than that of the rollers 14a, 14b, is fitted with a play to the driving shaft 13. In this way, even if the paper 1 is double fed, only the paper in the upper side is surely fed out despite its quality and thickness.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a paper feeding device used in information equipment, etc. to feed stacked single sheets of paper into the device one by one, and particularly to an optical character recognition device. The present invention relates to a paper feeding device used for.

[Conventional technology]

In laminated equipment, etc.! ? Among the paper feeding devices for feeding a large number of single sheets of paper into the device one by one, the conventional paper feeding devices used in particular in optical character recognition devices are as follows:
It has a configuration as shown in FIG. That is, the pusher roller 22 that is in pressure contact with the paper 21 from above is rotated in the direction of arrow A, and the friction between the pusher roller 22 and the paper 21 is used to sequentially feed out the stacked papers 21 starting from the highest one. A picker roller 23 and a reverse roller 24 rotate in the direction of arrow B and the same direction as arrow C while contacting each other, and separate the sheets one by one and feed them into the apparatus.

[Problem that the invention seeks to solve]

The conventional paper feeding device as described above utilizes the difference in the coefficient of friction between the paper and the picker roller and reverse roller.
By rotating these in the direction in which the paper is fed out and the other in the direction in which the paper is returned, the topmost paper is separated from those below it and fed into the device. The sending or separating force is
This depends on the friction coefficient of the paper, and the conveyance conditions vary depending on the area, thickness, stiffness, surface resistance, and friction coefficient of the paper.
There are disadvantages in that it may be difficult to reliably separate the sheets and send out only one sheet, and the separation may be incomplete and the sheets may be damaged.

An object of the present invention is to easily and reliably separate and feed paper sheets one by one in accordance with various paper conditions in a paper feeding device that utilizes the difference in coefficient of friction between paper and rollers as described above. The purpose of the present invention is to provide a paper feeding device with a

[Means for solving problems]

The paper feeding device of the present invention includes a stacking section that stacks and loads a plurality of single sheets of paper, a pusher roller that contacts the topmost paper of the papers and rotates in a direction to send out the paper, and a a picker roller disposed in the paper feeding direction and rotating in the same direction as the pusher roller; a reverse roller contacting the picker roller and rotating in the opposite direction to the paper feeding direction; and rotational movement of the picker roller. and a suction device connected to the picker roller to suck air, the picker roller being rotatable via a drive shaft driven by the drive device and a bearing on the drive shaft. The spacer has a suction port that is attached to the spacer and has a suction port that sucks air from the outside, and a discharge port that is connected to the suction device, and two rollers that are disposed on both sides of the spacer.

〔Example〕

Next, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a configuration diagram showing an embodiment of the present invention, and FIG. 2 (a>
and (b) is a front view and a cross-sectional view taken along the line A--A, with a portion taken in section, to show details of the picker roller in FIG. 1.

As shown in FIG. 1, this embodiment includes a stacking section 2 loaded with a large number of single sheets of paper 1, and a pusher roller that is in pressure contact with the stacking section 2 from above and rotates in the direction of arrow A for sending out the sheets of paper 1 from the stacking section 2. 3, and a reverse roller that rotates in the same direction while pressing against each other in order to separate two or more sheets sent out from the stacking section 2 and send only the topmost sheet into the device. 4 and a picker roller 5, a suction device 6 for giving a paper suction effect to the picker roller 5, and a drive device 7 for driving rotation of the picker roller via a belt or the like.

As shown in FIG. 2, the picker roller 5 includes a spacer 11 connected to the suction device 6 and rotatably housed on the drive shaft 13 via a bearing 12, and a spacer 11 provided on both sides of the spacer 11. It has two rollers 14a and 14b fixed to the drive shaft 13. On the outer periphery of the spacer 11, one suction port 15 and one discharge port 16 are provided.
(see FIG. 2(b)), the suction port 15 faces the surface where the two rollers 14a and 14b come into contact with the paper, and the air is sucked from the suction device 16 through the discharge port 16.
(arrow F), the suction port 15
Since air flows into the spacer 11 from the arrow G), the suction force against the paper increases. Note that a seal 17 is provided around the suction port 15 to prevent air leakage.

When the picker roller 5 configured as described above is rotated by the drive device 7 in the direction of arrow B (forward direction) at a rotation speed faster than the reverse roller 4, two or more sheets of paper are transferred between the reverse roller 4 and the picker roller 5. When the paper comes in between the sheets, an adsorption force acts on the topmost paper in addition to frictional force, so the force acting between the picker roller 5 and the paper is greater than the frictional force between the sheets, so the topmost paper is To separate.

At this time, since the rotational speed of the picker rollers is faster than the rotational speed of the reverse roller 4 in the direction of arrow C, the single sheet of paper (or the sheet that has entered only one sheet) is moved in the direction of the apparatus (arrow D). Since the sending force is stronger than the force pushing back the paper by the reverse roller 4, only the topmost sheet is fed. Picker roller 5 during this separation operation
The pressing force between the sheet and the reverse roller 4 may be a small value because the picker roller 5 is subjected to adsorption force due to air.

As explained above, in this embodiment, after the stacked sheets are fed out, the reverse roller 4 and the picker roller 5 paired with the reverse roller 4 pick up two or more overlapping sheets. The uppermost sheet of paper can be temporarily sucked by the absorbing device 6, and the separation force and feeding force can be applied to overcome the maximum frictional force acting between the sheets.
It is possible to easily and reliably separate and feed the top sheet.

Further, since the suction force is utilized at the same time as the frictional force, there is no need to make the characteristics of the feeding device special with respect to the various properties of the paper.

〔Effect of the invention〕

As explained above, the paper feeding device of the present invention has a picker roller that has a paper adsorption function, so that it can easily and reliably feed the topmost paper without being affected by the properties of the paper. This has the advantage of being able to supply one sheet at a time to the host device.

Further, since it is not necessary to place particular emphasis on adjusting the force acting between the roller and the paper, there is an effect that manufacturing becomes easier.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing an embodiment of the present invention, and FIG. 2 (a>
and (b) is a partially sectional front view to show the details of the picker roller in Fig. 1, a sectional view taken along line A-A, and
The figure is a configuration diagram showing the prior art. 1.21... Paper, 2... Loading section, 3.22...
Pusher roller, 4.24... Reverse roller, 5.
23... Picker roller, 6... Suction device, 7...
Drive device, 11... Spacer, 12... Bearing, 13... Drive shaft, 14a/14b... Roller, 1
5... Suction port, 16... Discharge port, 17... Seal. Agent Patent Attorney Uchihara Oto'muku/ekushi'

Claims (1)

[Claims] a stacking section for stacking and loading a plurality of sheets of single sheet paper; a pusher roller that contacts the topmost sheet of the sheets and rotates in a direction to send out the sheets; and a pusher roller disposed in the sheet sending direction of the pusher. a picker roller that rotates in the same direction as the pusher roller; a reverse roller that contacts the picker roller and rotates in a direction opposite to the paper feeding direction; a drive device that drives the rotational movement of the picker roller; a suction device that is connected to a picker roller and sucks air; the picker roller is rotatably attached to a drive shaft driven by the drive device; and a suction device that is rotatably attached to the drive shaft via a bearing and sucks air from outside. A paper feeding device comprising: a spacer having a suction port and a discharge port connected to the suction device; and two rollers disposed on both sides of the spacer.