JPS61111238A - Paper feeding device - Google Patents

Abstract

PURPOSE:To perform stable feed of papers through separation of one paper at each time, by a method wherein a press plate is located to a control plate and about in the same level as that of a separating claw, and the paper is fed over the separating claw without being bent by the separating claw. CONSTITUTION:A separating claw 24 is positioned facing two corners at the forward end of a paper 37, and is sloped slightly upward and is secured to a control plate 23. An energizing means 27, energizing the two corners of the paper in the direction of the claw 24 and having the one end fixed to a rotary table 21, is located to the surface of the rotary table 21 positioned facing the claws 24. According to a paper feeding instruction, the table 21 is pressed up in the direction of a paper feed roller 16, and the paper 37 on the table 21 is pressed against the roller 16. The two corners positioned facing the claw 24 of the paper 37 are lightly pressed up toward the claw 24 by means of the energizing means 27, and when the roller 16 is rotated, the forward end, positioned facing the claw 24, of the uppermost paper 37 is bent upward, the paper is fed over the claw 24 through nerve of the paper itself for feeding, and the paper is prevented from floating with the aid of a press plate 28.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a paper feeding device for feeding stacked sheets one by one.

<Prior Art> An electrophotographic copying machine forms an image of a document on a photoreceptor, which is a recording medium, and copies this image onto paper. The pine copy paper is fed one by one to the pine copy position. For this reason, conventional paper feeding devices stack a large number of sheets, separate the sheets one by one, and feed the sheets to a copying position.

There is a means for separating and feeding the above-mentioned sheets one by one, as shown in FIG. 7. In FIG. A stand 41 is provided. A large number of sheets are placed on this turning stand 41, and separation claws 42 are provided on the paper feed cassette or the paper feed stand to separate the sheets, corresponding to both corners of the sheets. The one-time pick stand 41 is powered by an energizing means (not shown in the figure), for example, when the paper is fed low or low. Pushed up to the 43 side. When the sheet 44 is pushed up, the separation claw restricts the sheet 44 from being pushed up, and the position of the top #44 is always regulated to a predetermined height.

In the above configuration, the sheets are fed one by one starting from the uppermost sheet 44 by the sheet feeding action of the sheet feeding a-ra 43. At this time,
When the paper feed roller 43 comes into pressure contact with the paper 44, the paper 44 separates from the separation claw 42 and no longer functions as a separation claw.4. Therefore, in the conventional case, the separation claw 42 is provided to be movable within a certain circle, and the separation claw 42 uses its own weight to move the uppermost part of the Wc4.
There is one that is configured so that it touches 4. If this is the case,
Since the separation claw 42 is always located at #44,
Separation and feeding of paper sheets one by one is ensured. However, there is a drawback that the structure of the separation claw 42 is complicated.

On the other hand, if the separation claw 42 is fixed at a normal position value, the structure of the separation claw 42 will be simplified, but the separation effect will be reduced. Furthermore, as shown in the figure, when the paper 44 is about to be fed by the rotation of the paper feed roller 43, the leading edge of the paper 44 is bent by the claws and the paper is fed. At this time, the leading edge of the paper 44 was bent, and one of the claws came off quickly, causing skew feeding. Therefore,
Paper feeding became unstable and lacked reliability.

<Objective of the Invention> The present invention aims to not only ensure separation but also provide stable paper feeding in an apparatus in which separating claws for separating sheets one by one are fixed.

<Example> The present invention will be described in detail below with reference to the drawings.

FIG. 1 is a perspective view showing a paper feed tray according to the present invention, FIG. 2 is a top view thereof, FIG. 3 is a sectional view of the main parts, and FIG. 4 is a copying machine equipped with a paper feed tray of the present invention. FIG.

First, in FIG. 4, reference numeral 1 denotes a document table for placing an original, and 2 denotes an illumination device 3 for illuminating the document on the document table.
4 is a corona discharger for uniformly charging a drum-shaped photoreceptor 5 having a photoreceptor surface; 6 is an optical system that projects an image of the original onto a photosensitive surface; An exposure position for projecting a light image onto the photoconductor 5, a developing device 7 for converting the electrostatic latent image on the photoconductor into a visible toner image, and a corona 8 for transferring the image on the photoconductor to the paper being fed. A discharger; 9 is an AC corona discharger for separating the paper from the photoreceptor; 10 is an AC corona discharger for removing the charge on the photoreceptor; 1;
1 is cleaning to remove toner remaining on the photoreceptor!
Ii! , 12 is an optical static eliminator for making the surface potential of the photoreceptor uniform.

The paper that is sent to the above transfer position as appropriate is
3, or the paper is selectively fed from the paper feed tray 14. The paper feed cassette 13 or the paper feed tray 14 is detachably installed in the main body of the copying machine.

A paper feed roller 15 is arranged opposite to the mounting position of the paper feeding cassette 13, and a paper feeding loaf 16 is arranged opposite to the mounting position of the paper feeding table 14. The paper stored in the paper feed cassette 13 is fed one by one by the rotation of the paper feed roller 15, and the paper is fed by the conveyance roller 1, which conveys the paper in synchronization with the photoreceptor 5.
Sent to 7.

Further, the paper on the paper feed table 14 is fed by the rotation of the paper feed roller 16, and is sent to the above-mentioned transport roller 17 via the transport row 217-1. The paper conveyed by the conveyance roller 17 faces the transfer position, and the toner image on the photoreceptor 5 is electrostatically transferred by the action of the transfer corona discharger 8 . The paper on which the image has been transferred is separated from the photoreceptor 5 by an AC corona discharger 9 and guided to a fixing roller 18 . Then, the paper after fixing is passed through the ejection roller 19.
It is discharged onto the tray 20.

As shown in FIG. 1, the paper feed tray 14 includes a T-shaped tray 21 rotatable about a fulcrum 22. As shown in FIG. Further, on the paper feed table 14, a regulation plate 23 for regulating both the third ends of the paper is movably provided. As for the movement mechanism of the regulating plate 23, a conventionally known means is used, and a description thereof will be omitted. The regulation plate 23 has N
Separation claws 24 for separating and feeding paper one by one are attached.The one-separation claws 24 are located corresponding to both corners of the leading edge of the paper, and are slightly above the paper as shown in FIG. It is inclined in the direction and fixed to the regulation plate 23.

Furthermore, on the bottom surface of the paper feed table 14 facing the paper feed row 216,
An opening 25 is provided for pushing up the rotary table 21 toward the paper feed roller 16. In particular, the opening 25 is
The opening 25 is formed at the center in the width direction, and the paper feed roller 16 is disposed in correspondence with the opening 25.

A friction member 26 is attached to the surface of the rotary table 21, which rotates around the fulcrum portion 22.

A biasing means 27 for biasing both corners of the paper toward the separation claw 24 is provided on the surface of the rotary table 21 corresponding to the separation claw 24 . This biasing means 27 has one end fixed to the turntable 21, and is made of, for example, a Mylar film with a thickness of 0.1 mm, and is attached so as to push up the paper very lightly (see Fig. 3). .

Further, a restraining plate 28 is fixed to the regulating plate 23 so as to be approximately at the same height as the separating claw 24 to prevent the paper from floating up. Moreover, an auxiliary member 30 of the regulation plate is fixed to the opposite side of the regulation plate 23 to the regulation plate 23 for attaching a dual-purpose member 29 which also serves as a handle so as to move the regulation plate 23. This auxiliary member 30 is formed in a U-shape, and its negative half is fixed to the regulating plate 23. and,
A groove 31 into which one piece of the auxiliary member 30 is inserted is formed in the dual-purpose member 29 . This $1131 is the regulation plate 23
It is a configuration that can also be incorporated into. Therefore, dual use i
When the groove 31 of the member 29 is inserted into the regulating plate 23, both ends of the paper are regulated by the dual-purpose member 29. At this time, the thickness of the dual-purpose member 29 is set so that the leading edge corner of the paper is removed from the separating claw 24.

An example of a mechanism for pushing up the rotary table 21 is shown in FIG. A push-up member 32 that does not protrude into the paper feed tray 14 except when feeding paper is provided corresponding to the opening 25 of the paper feed tray 14. This push-up member 32 is connected to a pressure lever 34 rotatably attached to a fixed plate 33 fixed to seven frames of the main body of the copying machine.

The pressure lever 34 is biased toward the paper feed roller 1611 by a spring 35, and a fan-shaped cam 36 is disposed corresponding to the pressure lever 34 so as to regulate this bias. 36 is in contact with the pressure lever 34 and positions the push-up member 32 outside the paper feed table 14. When the contact between the cam 36 and the pressure lever 34 is removed, the urging force of the spring 35 pushes up the rotary table 21 and transfers the paper 37 to the feed loaf 1, as shown in FIG.
6. Crimp. ll The paper feed row 216 is fixed at a normal position value as shown in the figure, and feeds the paper 37 that is pressed into contact with it by rotating. The fed paper 3 is placed outside the paper feed direction of the paper feed tray 14.
A friction plate 38 that prevents two-sheet feeding of the paper feed roller 16 is pressed against the paper feed roller 16. This friction plate 38 is also connected to the rotary table 21, for example.
The paper feed roller 16 is pressed against the paper feed roller 16 in conjunction with the pushing-up operation of the paper feed roller 16 . Therefore, the fed paper 37 is transferred to the transport roller 217 by the action of the friction plate 38 and the paper feed roller 16.
transported to.

The operation of the paper feeding device configured as described above will be explained below. The explanation will be given assuming that the paper feed tray 14 is currently in a paper feeding state. A large number of sheets 37 are placed on this sheet feed table 14 by the separation claw 2.
4, the tip is regulated and installed. When the copy switch is operated in this state, the copying operation of the copying machine is started, and the feed ## roller 16 is selectively driven in response to a paper feed command. At this time, in response to the paper feed command, the rotating table 21 is pushed up in the direction of the paper feed roller 16 by the push-up mechanism, and the paper 37 is pressed against the paper feed roller 16 .

Then, both corners of the sheet 37 on the spinning table 21 of the paper feed tray 14, which correspond to the separation claws 24, are pressed against the separation claws 2 by the biasing means 27.
It is pushed up towards 4 (see Figure 13).

When the paper feed roller 16 is rotated, the uppermost paper 37
The leading edge of the paper sheet corresponding to the separation claw 24 is curved upward and uses the stiffness of the paper itself to overcome the separation claw 24 and feed the paper. In this case, since there is not a large space between the separating claw 24 and the corner of the paper 37 as in the conventional case, the paper does not fall into the bottle as shown in FIG.

Therefore, paper folding at the leading edge of the paper 37 and conveyance defects such as skew feeding are eliminated. Finally, the separation claws 24 at both corners of the paper 37 can be smoothly crossed over, which has a great effect of preventing skew feeding.Moreover, since the separation claws 24 are slightly inclined in the embodiment, the paper 37 can be easily moved over the separation claws 24. 37 becomes smoother, and the paper can be reliably fed with a very light paper feeding force. In this embodiment, the angle of inclination of the separation claw 24 is approximately 5°30', which produces a good effect, and if the angle of inclination becomes too large, the separation claw 24 will not be able to fulfill its role.

Further, in this embodiment, the restraining plate 28 is attached to the regulating plate 23 at a position that is approximately the same height as the separating claw 24, which has the effect of increasing the stiffness of paper with weak stiffness, such as thin paper. has. In other words, the upward curvature during paper feeding is
The paper is restrained to some extent by the restraining plate 28, and the paper is separated by the separation claw 245.
For example, separation claw 2
Paper 37 on the holding plate 28 from the tip regulation position of 4*37
The distance 1 to the holding position (in this embodiment, the tip of the holding plate 28) is 30 when the l#37 is 60 to 90 g/w2.
Sufficient effects can be expected when ≦L≦60 (am).

Furthermore, when feeding thick paper such as paper, use the separation claw 2.
4, the paper feed is restricted and smooth paper feeding is not possible.Furthermore, even without the separation claw 24, the action of the paper feed row 216 alone is enough to feed one sheet.

According to this embodiment, the groove 31 of the dual-purpose member 29 that forms the iron layer of the handle is inserted into the regulating plate 23.
Both ends of the paper are regulated by dual-purpose members 29. In this case, both corners of the leading edge of the paper are out of the separation claw 24. Therefore, even thick paper can be fed smoothly and stably without being restricted by the separation claw 24.

On the other hand, in the paper feeding operation, the paper J! When the paper 37 starts to be transported by the transport roller 17-3, the pushing up action of the push-up member 32 is stopped, the rotary table 21 is lowered, and the pressure between the paper 37 and the paper feed roller 16 is released. At the same time, the friction plate 38 also separates from the paper feed roller 16. Therefore, the feed paper 37 is thereafter transported to the transport roller 17 by the transport roller 17-9.

According to the description of this embodiment, the paper feed tray 14
Although the paper feeding cassette 13 shown in FIG. 4 has been described above, it is obvious that the paper feeding cassette 13 shown in FIG.

<Effects of the Invention> According to the paper feeding device of the present invention, the separation claw for separating and feeding paper is fixed at a fixed position value, and the paper is biased in the direction of the separation claw. The leading edge of the paper fed by the paper feed roller is not bent by the separation claw (there is no paper folding, etc.), and smooth paper feeding can be expected.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a paper feed tray of a paper feed device according to the present invention, FIG. 2 is a top view of FIG. 11, FIG. 3 is a sectional view of FIG. 1, and FIG. FIG. 5 is a cross-sectional view of the copying machine showing a state in which the base is attached to the copying machine; FIG. 5 is a cross-sectional view showing an example of the push-up mechanism according to the present invention; FIG. The figure is a cross-sectional view showing an example of conventional paper feeding attachment. 13; Paper feed cassette 14; Paper feed tray 15.16; Feeding @a-? 21: Turntable 23; Regulation plate 24; Separation claw 27; Biasing means 32; Pushing up member

Claims (1)

[Claims] 1. A rotating table rotatably provided to place stacked sheets of paper and move the sheets toward the paper feed roller, and both corners of the loaded sheets. A paper feeder comprising: a paper separation claw provided correspondingly to the paper separation claw and fixed at that position; and means provided on the rotary table for biasing both corners of the paper toward the separation claw. paper equipment.