JPH0210054B2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Technical Field of the Invention The present invention relates to a paper sheet system that feeds out accumulated originals in a facsimile machine or the like or paper sheets (cut sheets) in a copying machine one by one from a stock section to a conveyance section in an orderly manner. Regarding the type feeding mechanism.

(b) Background of the technology In a facsimile machine or a copying machine, a manuscript or a single sheet of paper is transferred from the accumulated stock section.
It is extremely important to reliably feed out one sheet at a time in order to prevent jams and transmission contents from being lost. Particularly in facsimile machines, documents must be fed one by one from a stock section at a constant speed, and if the feeding or transport is unstable, it will adversely affect the reading of the surface of the document.

(c) Problems with the prior art The conventional method will be explained below with reference to FIG. FIG. 1 is a side sectional view illustrating an embodiment of a conventional sheet feeding mechanism.

As shown in the figure, original documents 1 are stacked in a stacker 2. As shown in FIG. The leading end of the lowermost document 1 is in contact with the paper feed roller 3 .

Furthermore, a friction plate 4 is provided as a separate member for separating the original 1, and is provided so as to come into pressure contact with the paper feed roller 3, and the leading edge of the original 1 protrudes into the narrowed part formed by the friction plate 4 and the paper feed roller 3. It is becoming a state. The friction plate 4 is made of a material with a high friction coefficient, such as rubber, and the paper feed roller 3 is made of a material with an even higher friction coefficient than the friction plate 4.

In order to press the friction plate 4 against the paper feed roller 3, it is pressed in the direction of arrow P by a leaf spring 6 attached to the guide plate 5.

The guide plate 5 has a guide plate 7 which is disposed opposite to each other with a gap therebetween.
An optical system (not shown) reads the surface of the document as indicated by arrow R. A conveyance section consisting of a feed roller 9 and a pinch roller 10 is provided close to the distal ends of the guide plates 5 and 7, and a detection section 11 is provided in contact with the conveyance section.

When the sheet feeding mechanism with such a configuration is driven,
The lowest one of the originals 1 is conveyed to the gap between guide plates 5 and 7 while being compressed by the paper feed roller 3 and friction plate 4 as the paper feed roller 3 rotates in the direction of arrow A.

At this time, the principle that only the lowest document 1 among the documents stacked on the stacker 2 is fed out is that the frictional force of the friction plate 4 is greater than the frictional force between the documents.
This is because the brake is applied to the original after the first sheet.

The fed-out document 1 is sent to the guide plates 5 and 7 by the friction force of the paper feed roller 3 against the friction force of the friction plate 4.

The original 1 that has been fed into the gap formed by the guide plates 5 and 7 is further fed by the paper feed roller 3.
It reaches a conveyance section consisting of a feed roller 9 and a pinch roller 10. Then, it is bitten by the feed roller 9 and the pinch roller 10, and reaches a detection section 11 consisting of an optical sensor, a micro switch, or the like. When the detection unit 11 detects the document 1, a clutch (not shown) of the paper feed roller 3 is disengaged so that the paper feed roller 3 can freely rotate. Thereafter, as the feed roller 9 rotates in the direction of arrow B, the document 1 is pinched by the pinch roller 10 and sent out in the direction of arrow C at a predetermined speed.

In such a sheet feeding mechanism, the mutual relationship between the frictional force between the paper feed roller 3 and the friction plate 4 is extremely important, and the operation may vary depending on the paper quality of the document 1 and the amount of documents in the stacker 2. comes with different results.

Therefore, depending on the quality of the paper and the amount of documents in the stacker 2, there is a drawback that feeding may not be carried out normally one by one.

(d) Object of the Invention It is an object of the present invention to solve the above-mentioned drawbacks and to provide a paper sheet feeding mechanism that allows document feeding to be performed accurately and reliably.

(e) Structure of the Invention In order to achieve the above object, the present invention includes a paper feed roller that is a high friction coefficient member that comes into contact with the paper sheets at the lowest part of the stock section, and a paper feed roller that has a friction coefficient lower than that of the paper feed roller. It consists of a separate member that presses its tip against the circumferential surface of the paper feed roller and separates one of the multiple sheets on the roller side based on the difference in friction coefficient, and a separate member that is provided on both outsides of the separate member. , a conveying plate spring that presses the tip of the paper sheet against the paper feed roller to prepare the leading edge of the paper sheet, and guides the paper sheet to the narrow area formed by the paper feed roller and the separate member, and a friction coefficient lower than that of the paper feed roller. It consists of a member, and is provided on both outsides of the conveying leaf spring.
a gate rubber that presses the tip of the paper feed roller to prevent a plurality of paper sheets from flowing into the narrowed portion;
Separate members, conveyance leaf springs, gate rubber,
Each of them has a pressure adjustment means.

(f) Embodiment of the Invention An embodiment of the present invention will be described below with reference to FIGS. 2 to 4.

FIG. 2 is a side view of the pressing unit of the sheet feeding mechanism according to the present invention, FIG. 3 is a front view of FIG. 2, and FIG. 4 is a side sectional view of the sheet feeding mechanism.

In the figure, 12 is a gate rubber, 13 is a separate rubber, 14 is a conveying leaf spring, 15 is a coil spring, 16 is a gate metal fitting, 17 is a pressing metal fitting, 18 is a fixing metal fitting, 19 is a traction metal fitting, 24 is a shaft, 21a~
21e is a screw, and 22 is a main body metal fitting. Items with the same reference numerals throughout the figures are the same.

The paper sheet feeding mechanism of the present invention is shown in FIGS. 2 to 4.
As shown in the figure, a conveyance leaf spring 1 serves as a conveyance member that conveys the original 1 on the stacker 2 to the paper feed roller 3.
4, a separate rubber 13 as a separating member that comes into pressure contact with the feed roller 3 and separates and feeds out a plurality of documents 1 one by one; The gate rubber 12, which serves as a restraining member for preventing paper from flowing into the pressure contact portion between the paper roller 3 and the separate rubber 13, is integrally formed into a unit.

Each member has means for adjusting the pressing force against the paper feed roller 3, and the adjustment is made in accordance with the paper quality of the originals 1, the quantity on the stacker 2, etc.

The structure and operation of the above unit will be described in detail below. As shown in FIGS. 2 and 3, the gate rubber 12 has a rectangular shape, and the gate metal fittings 12 are positioned on both sides of the conveying leaf spring 14. It is attached and provided.

The conveying plate spring 14 has a rectangular plate spring that protrudes and is attached to the gate fitting 16 so as to be located between the gate rubbers 12 on both sides of the separate rubber 13.
It is fixed at 1a.

The separate rubber 13 is a conveying leaf spring 14.
The press fitting 17 is located inside the fixing fitting 1 and is fixed to the holding fitting 17 with a screw 21b.
8 by a shaft 20, and is rotatably locked using the shaft 20 as a fulcrum.

A pulling fitting 19 is attached to the end of the fixing fitting 18 with a screw 21c, and a coil spring 15 is stretched between the pulling fitting 19 and the pressing fitting 17. It is designed to rotate in direction B.

In order to construct a sheet feeding mechanism using a unit having such a structure, the fixing metal fitting 18 can be fixed to the main body metal fitting 22 on the apparatus side with a screw 21d, as shown in FIG.

In this case, gate rubber 12, separate rubber 1
3. As described above, the conveying plate spring 14 needs to be pressed against the paper feed roller 3 with an optimum pressure determined by the quality and quantity of the document 1.

To explain how to adjust this pressure, the gate rubber 1
Step 2 is performed by loosening the screw 21a fixing the gate fitting 16 and sliding it in the direction of the arrow DE along the elongated hole drilled in the gate fitting 16 and into which the screw 21a is inserted. Next, the separate rubber 13 is adjusted by loosening the screw 21c of the traction fitting 19 and sliding it in the direction of the arrow FG along an elongated hole through which the traction fitting 19 is drilled and the 21c is inserted. Furthermore, a conveyor plate spring 1
Adjustment 4 is performed by loosening the screw 21e that fixes the conveying leaf spring 14, and sliding it in the direction of the arrow H-I along an elongated hole drilled in the conveying leaf spring 14 and into which the screw 21e is inserted.

In this way, all the pressure adjustments have been completed, but the paper feed roller 3 is rotated in the direction of arrow A, and the stacker 2
A feeding operation is started to feed out the originals 1 placed on the sheet one by one.

To explain the functions of each member during the feeding operation, first, the conveying plate spring 14 comes into contact with the leading edge of the document 1 placed on the stacker 2, and aligns the leading edge of the document 1 in a shape that makes it easy to feed out the document 1. , serves to guide the leading edge of the document 1 so that it is correctly inserted into the narrowed area formed by the abutting area between the paper feed roller 3 and the separate rubber 13. Then, the document 1 introduced into the abutting section is moved by the difference in frictional force between the separate rubber 13 and the paper feed roller 3, which is made of a material with a higher friction coefficient than the separate rubber 13, as described in the prior art. They will be rolled out one by one.

However, if the number of documents 1 placed on the stacker 2 is large, in the conventional technology, the conveying leaf spring 14 cannot withstand the pressing force of the leading edge of the document and bends, resulting in multiple The document 1 is inserted into the contact area between the paper feed roller 3 and the separate rubber 13 at once,
This was causing feeding defects. Conventionally, this problem has been solved by increasing the strength of the conveyance leaf spring 14, but if the strength is increased too much, a jam will occur at the contact area between the conveyance leaf spring 14 and the paper feed roller 3. Therefore, the adjustment required skill and a lot of man-hours.

The gate rubber 12 solves the above-mentioned problem.If the gate rubber 12 is pressed against the paper feed roller 3 with an appropriate pressure, even if the conveying leaf spring 14 is bent by the pressure of the document 1, the gate rubber 12 Since the edge portion of the document 1 is restrained, it is no longer possible for a plurality of documents to be inserted into the contact portion between the paper feed roller 3 and the separate rubber 13 at the same time.

The gate rubber 12 has a margin of adjustment because it is made of rubber, whereas the conveying leaf spring 14 is made of a metal spring and has no margin for adjustment, so even if the pressure is increased a little, There is no possibility of a jam occurring at the contact portion with the paper feed roller 3.

Therefore, the adjustment work became easy, no skill was required, and the number of man-hours could be significantly reduced.

(g) Effects of the Invention As explained above, by applying the sheet feeding mechanism of the present invention to a device, assembly can be completed by simply attaching the unitized pressing member to the sheet feeding roller by pressing it. Providing a gate rubber makes adjustment easier, reducing the number of man-hours required, allowing more accurate feeding of documents, and improving the reliability of the device.

[Brief explanation of drawings]

FIG. 1 is a side sectional view illustrating an embodiment of a conventional paper sheet feeding mechanism, FIG. 2 is a side view of a pressing unit of the paper sheet feeding mechanism according to the present invention, and FIG. FIG. 4 is a side sectional view of the sheet feeding mechanism. In the figure, 1 is a document, 2 is a stacker, 3 is a paper feed roller, 5 and 7 are guide plates, 12 is a gate rubber,
13 is a separate rubber, 14 is a conveying leaf spring, 1
5 is a coil spring, 16 is a gate metal fitting, 17 is a pressing metal fitting, 18 is a fixing metal fitting, 19 is a traction metal fitting, 20 is a shaft, 21a to 21e are screws, and 22 is a main body metal fitting.

Claims (1)

[Scope of Claims] 1. A paper sheet feeding mechanism that feeds out paper sheets one by one from a stock section in which a plurality of paper sheets are stacked together, comprising: a paper sheet at the bottom of the stock section; It consists of a paper feed roller with a high friction coefficient member that comes into contact with the leaves and feeds them out, and a member with a lower friction coefficient than the paper feed roller,
a separate member that presses its tip against the peripheral surface of the paper feed roller and separates one of the stacked paper sheets on the roller side due to a difference in friction coefficient; provided on both outer sides of the separate member; a conveying plate spring that presses its tip against the paper feed roller to prepare the tip of the paper sheet and guides the paper sheet to a narrowed portion formed by the paper feed roller and the separate member; Made of materials with a lower coefficient of friction than
Gate rubbers are provided on both outer sides of the conveyance leaf spring and press the tip of the paper sheet against the paper feed roller to prevent a plurality of sheets from flowing into the narrowed portion; A paper sheet feeding mechanism characterized in that the leaf spring and the gate rubber each have pressure force adjusting means.