JP2000062968A - Paper feeding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the bias or bowed filling of the recording medium by oscillating an intermediate plate energizing member around the predetermined fixed position freely along a direction of extension of other edge, and oscillating an intermediate plate similarly with the oscillation of the intermediate plate energizing member. SOLUTION: An intermediate plate energizing member 162 is fixed to a shaft 120 by one stage bis 164. This fixing position faces a central part of other edge of an intermediate plate 112. Namely, the stage bis 164 is positioned just under a central part of the intermediate plate 112 in the cross direction (an arrow B direction). Since the intermediate energizing member 162 is fixed to the shaft 120 by the stage bis 164, the intermediate energizing member is freely oscillated around the fixed position in an arrow C direction along the other edge extending direction (the arrow B direction). A Z-shaped part of one edge of the intermediate plate 112 is inserted into a hole formed in a bottom wall 114a of a cassette container 114 in the loose condition. With this structure, the intermediate plate 112 is oscillated similarly with the oscillation of the intermediate energizing member 162.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper feeding device for feeding a recording medium from a cassette tray provided in an image forming apparatus such as a copying machine, a printer or a plotter.

[0002]

2. Description of the Related Art As an output device of a computer or a workstation, an ink jet type image forming device for ejecting ink to form an image on a recording medium, or an electronic device for forming an image on a recording medium using a developer (toner) or the like. A photographic image forming apparatus is known. These image forming apparatuses are usually provided with a cassette tray in which a plurality of recording media are stacked. This cassette tray is incorporated in the main body of the image forming apparatus so that it can be freely taken in and out, and the recording medium stored in the cassette tray is
The image is fed to the image forming unit on which an image is formed at a predetermined timing. This paper feeding is performed by a paper feeding device incorporated in the cassette tray and the main body of the image forming apparatus.

An example of a conventional sheet feeding device will be described with reference to FIGS. 7, 8 and 9.

FIG. 7 is a perspective view showing a conventional sheet feeding device, in which a part of an intermediate plate is cut away. 8 is a sectional view showing the sheet feeding device of FIG. 7 from the side, and FIG. 9 is a sectional view showing the sheet feeding device of FIG. 7 from the front.

The sheet feeding device 100 includes a substantially rectangular middle plate 112 on which a plurality of recording media are stacked. Middle plate 112
The one side 112a is bent in a "Z" shape,
A "Z" -shaped portion is inserted into a hole formed in a bottom wall 114a of the cassette trough 114 so as to rattle. Therefore, a portion of the one side portion 112a inserted into the hole can move inside the hole. Further, the other side portion 112b opposite to the one side portion 112a is urged from below the middle plate 112 to above by the middle plate urging member (middle plate pressing plate) 116. Therefore, the other side portion 112b
Moves up and down according to the weight of the recording medium loaded on the intermediate plate 112.

As shown in FIG. 7, the middle plate urging member 116 has a hexagonal shape close to a triangle, and a polyethylene sheet having good slidability is attached to the surface at both widthwise ends of the long side 116a. The attached sponge 118 is fixed. The sponge 118 directly contacts the back surface of the middle plate 112. Therefore, the middle plate urging member 116 has the sponge 118.
It is in contact with the intermediate plate 112 via the. The short side 116b of the middle plate biasing member 116 is fixed to the shaft 120 with two screws 121.

As shown in FIG. 9, the shaft 120 is rotatably fixed to the side wall 114b of the cassette trough 114. As shown in FIG. 7, a substantially elliptical spring arm 122 is fixed to one end 120a of the shaft 120.
The spring arm 122 rotates with the shaft 120. A hole is formed in the spring arm 122, and one end 124a of the coil spring 124 is hooked in this hole. The other end 124b of the coil spring 124 is connected to the cassette trough 114 (see FIG. 7).
(Not shown). This coil spring 12
4 is a spring arm 1 in the direction of arrow A about the axis 120.
22 is urged to rotate. As a result, the middle plate urging member 116 urges the other side portion 112b of the middle plate 112 from below to above.

A rotary shaft 126 is provided above the other side portion 112b.
And the four paper feed rollers 12 fixed to the rotary shaft 126.
8 are arranged. The paper feed roller 128 also rotates as the rotation shaft 126 rotates. In feeding the recording medium, the rotary shaft 126 is rotated at a predetermined timing to rotate the paper feeding roller 128, and the recording medium is fed while being separated one by one by a separating claw (not shown). .

By the way, due to the dimensional accuracy and the mounting error of the respective components such as the intermediate plate 112 and the intermediate plate urging member 116, the four paper feed rollers 128 are provided on the other side 11 of the intermediate plate 112.
2b may not contact with a uniform pressure. In this case, the sponge 118 is deformed as shown in FIG. 9 so that the four paper feed rollers 128 contact the other side portion 112b with a uniform pressure. As a result, the recording medium loaded on the middle plate 112 is fed straight without skewing.

Another example of the sheet feeding device will be described with reference to FIGS.

FIG. 10 is a perspective view showing another example of the conventional sheet feeding device, in which a part of the intermediate plate is cut away. Figure 1
FIG. 1 is a schematic view showing the structure of a paper feed roller of the paper feed device of FIG. In these figures, the same components as those shown in FIGS. 7 to 9 are designated by the same reference numerals.

The other side 112b of the sheet feeding device 130 is urged by a middle plate urging member (middle plate pressing plate) 132 from the lower side to the upper side. As shown in FIG. 10, the middle plate biasing member 132 has a rectangular shape and biases the central portion of the other side portion 112b upward. Therefore, the other side 112b is
It moves up and down according to the weight of the recording medium loaded on the intermediate plate 112. The short side 132b of the middle plate biasing member 132 is 2
It is fixed to the shaft 120 with two screws 121.

Above the other side portion 112b, the rotary shaft 126 is provided.
And the two paper feed rollers 14 fixed to the rotary shaft 126.
0 is placed. As shown in FIG. 11, each paper feed roller 140 includes a cylindrical resin member 142 and a foam rubber belt 144 wound around the outer peripheral surface of the resin member 142. At the center of the resin member 142, a hole 142a through which the rotary shaft 126 passes is formed. This hole 142a
The inner diameter of is designed to have a fitting tolerance with respect to the outer diameter of the rotating shaft 126. In addition, a groove 142b that is orthogonal to the hole 142a is formed in the resin member 142. A pin 146 is fitted in the groove 142b, whereby the paper feed roller 140 is fixed to the rotary shaft 126. An E-ring 148 that regulates the position of the paper feed roller 140 is fixed to the rotary shaft 126 adjacent to the paper feed roller 140.

As described above, the foam rubber belt 144 is wound around the outer peripheral surface of the resin member 142 constituting the paper feed roller 140. Therefore, the middle plate 112 and the middle plate urging member 1
Due to dimensional accuracy and mounting error of each part such as 32, 2
Even if there is a possibility that the two paper feed rollers 140 do not come into contact with the other side portion 112b of the middle plate 112 with a uniform pressure, the foamed rubber belt 144 is arranged so that the two paper feed rollers 140 come into contact with the other side portion 112b with a uniform pressure. Is transformed. As a result, the recording medium loaded on the middle plate 112 is fed straight without skewing.

[0015]

The conventional paper feeder 100 described with reference to FIGS. 7 to 9 has the following problems.

As described above, the conventional paper feeder 100.
When the sponge 118 is deformed, the four paper feed rollers 128 contact the other side portion 112b with a uniform pressure to prevent the skew. However, since the size (thickness) of the sponge 118 has an upper limit, the deformation amount also has an upper limit. Therefore, when the dimensional accuracy of each component such as the middle plate 112 and the middle plate urging member 116 is poor or the mounting error is large, even if the sponge 118 is deformed to the maximum extent, the four paper feed rollers 128 are connected to the other side 112b. It may not be possible to contact with even pressure. In this case, the fed recording paper is skewed.

Thus, even when the dimensional accuracy of each component is poor or the mounting error is large, the four paper feed rollers 1
In order to bring 28 into contact with the other side portion 112b with a uniform pressure, the amount by which the sponge 118 can be deformed may be increased.
For this purpose, the sponge 118 is made thick. However, if the sponge 118 is made thicker, the thickness of the sponge 118 is equal to
However, the number of recording media that can be stacked on the intermediate plate 112 decreases, which is a disadvantage.

The conventional sheet feeding device 130 described with reference to FIGS. 10 and 11 has the following problems. This problem will be described with reference to FIG. FIG. 12 is a schematic diagram showing a state where a large number of recording media are stacked on the middle plate of the paper feeding device of FIG.

As described above, the conventional paper feeder 130.
Is configured so that the foamed rubber belt 144 is deformed so that the two paper feed rollers 140 contact the other side portion 112b with a uniform pressure to prevent the skew. However, when the number of recording media 150 stacked on the middle plate 112 is too large or when the mounting error of each component is large, both ends of the middle plate 112 bend downward as shown in FIG.

In this case, the inner portion 144a of the foamed rubber belt 144 of the paper feed roller 140 strongly contacts the recording medium 150, and the contact pressure at this portion becomes high. On the other hand, the outer side portion 144b of the foamed rubber belt 144 hardly contacts the recording medium 150, and the contact pressure at this portion becomes low. When the recording medium 150 is fed in such a state, the friction coefficient at the inner portion 144a of the foamed rubber belt 144 becomes higher than the friction coefficient at the outer portion 144b, which causes skew and conveyance failure. .

In view of the above circumstances, it is an object of the present invention to provide a sheet feeding device which prevents skewing and conveyance failure even when the dimensional accuracy of parts is poor or the mounting error is large.

[0022]

In a first sheet feeding device of the present invention for achieving the above object, one side portion is fixed and the other side portion opposite to the one side portion moves up and down. An intermediate plate on which a plurality of recording media are stacked, an intermediate plate urging member that urges the other side portion upward from below the intermediate plate, and a predetermined timing that is arranged above the other side portion. And a paper feed roller that rotates in the direction described above, and by rotating the paper feed roller in a state where the paper feed roller is in contact with the recording medium stacked on the middle plate, a direction intersecting the other side portion, In a paper feeding device that feeds the recording media stacked on the middle plate one by one, (1) the middle plate urging member has a predetermined fixed position as a center, and extends along a direction in which the other side extends. (2) The middle plate sways according to the sway of the middle plate urging member. Is characterized in that the at it.

Here, the intermediate plate urging member may be formed such that (3) the predetermined fixing position is opposed to the center of the other side portion.

A second sheet feeding device of the present invention for achieving the above object is provided with a plurality of recording media in which one side is fixed and the other side opposite to the one side moves up and down. An intermediate plate to be stacked, an intermediate plate urging member that urges the other side portion upward from below the intermediate plate, and a through hole that is arranged above the other side portion and is formed in the longitudinal direction. Paper feed roller,
A rotary shaft that penetrates the through hole and rotates at a predetermined timing, and rotates the paper feed roller together with the rotary shaft in a state where the paper feed roller is in contact with a recording medium loaded on the intermediate plate. As a result, in the paper feeding device for feeding the recording media loaded on the middle plate one by one in the direction intersecting with the other side portion, (4) the through hole of the paper feeding roller has an inner diameter of a central portion. Is smaller than the inner diameters of both ends.

Here, the paper feeding device may be provided with (5) fixing members fixed to both ends of the paper feeding roller for fixing the paper feeding roller to a predetermined position of the rotating shaft.

[0026]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic view showing the schematic arrangement of an image forming apparatus in which the paper feeding device of the present invention is mounted.

The copying machine 10 (which is an example of an image forming apparatus according to the present invention) is roughly classified into an image reading section 20 for reading an image formed on a document and a recording medium for the image read by the image reading section 20. And an image forming unit 60 formed in the above.

The image reading section 20 includes a pair of feed rollers 22 for feeding the document placed on the document setting table 12 in the direction of arrow A (feeding direction), and a document fed by the feed roller 22. A document table glass 24 to be placed is provided. In addition, the image reading unit 20 includes a document table glass 24.
A document feeder 28 for feeding the upper document is also provided. The document feeder 28 is provided with an endless belt 32 that is stretched around a pair of cylindrical rollers 30.
The original is conveyed while being pressed against the platen glass 24 by the rotation of 2. The document that has passed through the platen glass 24 is guided upward by the guide plates 34 and 36, is sandwiched by a pair of discharge rollers 38, and is discharged onto the document feeder 28.

The image reading section 20 also includes a scanner 40 for irradiating a document with light to obtain image information, and the scanner 40 is arranged below the document conveying device 28. The scanner 40 includes a copy lamp 42 including a halogen tungsten lamp, mirrors 44, 46, 48 and 5.
0 and a lens 52. These copy lamps 42
Scanning drive such as is performed using an optical motor (not shown). The copy lamp 42 exposes the original, and the reflected light 54 (light carrying image information) from the original is reflected by the mirror 44,
46, 48, 50, lens 52, and mirrors 56, 58
The photosensitive drum 62 of the image forming unit 60 is irradiated via
As a result, an electrostatic latent image is formed on the photosensitive drum 62.

The image forming section 60 is a photosensitive drum 62 which rotates in the direction of arrow C by a main drive motor (not shown).
Is equipped with. A primary charger 64 that uniformly charges the photosensitive drum 62 is arranged opposite to the photosensitive drum 62. A developing device 66 that develops an electrostatic latent image is arranged on the downstream side in the rotation direction of the photosensitive drum 62 with respect to the position where the photosensitive drum 62 is irradiated with the reflected light 54. Photosensitive drum 62
When the electrostatic latent image formed on the electrostatic latent image reaches a position facing the developing device 66, the developer is supplied from the developing device 66 to the electrostatic latent image, and a developed image is formed on the photosensitive drum 62.

A transfer area 68 where the developed image is transferred to the recording paper.
A transfer charger 70 is disposed in the printer. Further, a cleaning device 72 for scraping off the developer remaining on the photosensitive drum 62 after the transfer is disposed on the downstream side of the transfer area 68 in the rotation direction of the photosensitive drum 62. A pre-exposure lamp (not shown) that removes electricity from the photosensitive drum 62 is arranged downstream of the cleaning device 72 in the rotation direction of the photosensitive drum 62.

The copying machine 10 is equipped with cassettes 80 and 82 for accommodating recording sheets of A and B sizes. The copying machine 10 also includes a manual paper feed tray 84 on which recording sheets of A and B sizes are loaded one by one. Further, the copying machine 10 also includes a roll paper unit 99 that accommodates the roll paper 98, and the roll paper 98 is cut by the cutter 97 at a predetermined timing. Cassette 8
The recording paper or roll paper 98 accommodated in 0, 82 is conveyed toward the transfer area 68 by various paper feed rollers 86, and is nipped by registration rollers 88.

On the other hand, the recording paper placed on the manual paper feed tray 84 is conveyed toward the transfer area 68 by the paper feed roller 90, and is nipped by the registration rollers 88. The recording paper nipped by the registration rollers 88 is conveyed to the transfer area 68 at a predetermined timing, and the photosensitive drum 62 is transferred in the transfer area 68.
The developed image above is transferred. The recording sheet onto which the developed image is transferred is conveyed to the fixing device 94 by the conveying section 92. In this fixing device 94, the developed image is fixed on the recording paper.
The recording paper on which the developed image is fixed is discharged by the pair of paper discharge rollers 96, whereby one copy cycle is completed. [First Embodiment] A first embodiment of a sheet feeding device of the present invention will be described with reference to FIGS.

FIG. 2 is a perspective view showing the first embodiment of the sheet feeding device, and a part of the intermediate plate is cut away. Figure 3
FIG. 3 is a sectional view showing the paper feeding device of FIG. 2 from the front. In these figures, the same components as those shown in FIGS. 7 to 9 are designated by the same reference numerals.

A feature of the paper feeding device 160 is that a plate-shaped middle plate urging member 162 is swingably fixed to the shaft 120.
The middle plate biasing member 162 is fixed to the shaft 120 with one step screw 164. This fixed position is a position facing the center of the other side portion 112b of the middle plate 112. That is, the intermediate plate 11
Step screw 164 is located directly below the center of the width direction 2 (arrow B direction).
Will be located.

The middle plate urging member 162 has one step screw 164.
Since it is fixed to the shaft 120 by means of, it can swing freely in the direction of arrow C along the direction in which the other side portion 112b extends (the direction of arrow B) with the fixed position as the center. Also, as mentioned above,
A "Z" -shaped portion of one side portion 112a of the middle plate 112 is inserted so as to rattle into a hole (not shown) formed in the bottom wall 114a of the cassette trough 114. For this reason,
The middle plate 112 also sways following the sway of the middle plate urging member 162.

By the way, the intermediate plate 112 and the intermediate plate biasing member 16
When the dimensional accuracy of each component such as 2 is bad or the mounting error is large, when the middle plate urging member 162 pushes up the middle plate 112, the four paper feed rollers 128 contact the other side portion 112b with uniform pressure. There are things you can't do. However, as described above, the middle plate 112 and the middle plate urging member 162 have the other side portion 1
Since it freely sways in the direction of arrow C along the direction in which 12b extends, as shown in FIG. 3, the four sheet feeding rollers 128 and the middle plate 112 are kept in contact with the other side portion 112b with uniform pressure until they come into contact with each other. The plate urging member 162 swings and stops. As a result, when the recording medium stacked on the intermediate plate 112 is fed, the four feeding rollers 128 contact the recording medium with a uniform pressure to convey the recording medium, so that a conveyance failure or skew may occur. It can be prevented. In the above example, the middle plate urging member 162 is swingably fixed to the shaft 120 with the step screw 164. It may be configured to do so. [Second Embodiment] A second embodiment of the sheet feeding device will be described with reference to FIGS. 4, 5 and 6.

FIG. 4 is a perspective view showing a second embodiment of the sheet feeding device, in which a part of the intermediate plate is cut away. Figure 5
FIG. 6 is a schematic diagram showing a structure of a paper feed roller included in the paper feed device of FIG. 4. FIG. 6 is a schematic diagram showing a state in which a large number of recording media are stacked on the middle plate of the paper feeding device of FIG. In these figures, the same components as those shown in FIGS. 10 to 11 are designated by the same reference numerals.

The characteristic of the sheet feeding device 170 of the second embodiment is that
The point is that the structure of the paper feed roller 180 is devised. Rotating shaft 1
Two paper feed rollers 180 are fixed to the position 26 corresponding to both ends of the other side 112 b of the middle plate 112. This position is a position corresponding to the outside of the portion where one side portion 112 a of the middle plate 112 is inserted into the hole of the cassette trough 114.

The paper feed roller 180, as shown in FIG.
A columnar resin member 182 and a foam rubber belt 184 wound around the outer peripheral surface of the resin member 182 are provided. At the center of the resin member 182, a through hole 186 through which the rotary shaft 126 penetrates is formed. The inner diameter of the central portion 186a of the through hole 186 in the depth direction is designed with a fitting tolerance dimension with respect to the outer diameter of the rotary shaft 126. Through hole 18
The inner diameter of 6 is the smallest at the central portion 186a, and its outlet 18
It becomes larger as it gets closer to 6b. Therefore, the through hole 186
Has a drum-shaped contour. Therefore, the inner diameter of the central portion of the through hole 186 is smaller than the inner diameters of both end portions (portion of the outlet 186b).

As will be described later, when the paper feed roller 180 is not loaded, the central portion 18 of the through hole 186 is formed.
Only the inner wall of 6a is in contact with the rotating shaft 126, and the outlet 1
The inner wall of the portion 86b does not contact the rotating shaft 126.
When a load is applied to the paper feed roller 180, the paper feed roller 180
Swings in the direction of arrow D, and the inner wall of the outlet 186b also contacts the rotating shaft 126. The resin member 182 is provided with a vertically long groove 188 that is orthogonal to the through hole 186.
A pin 190 is fitted in this groove 188, whereby the paper feed roller 180 is fixed to the rotary shaft 126.

On both sides of each paper feed roller 180,
A torsion coil spring 192 for urging each paper feed roller 180 in the rotation axis direction is fixed. An E-ring (which is an example of a fixing member according to the invention) 194 that regulates the position of each torsion coil spring 192 is fixed to the rotating shaft 126 adjacent to each torsion coil spring 192. Thus, by the torsion coil spring 192 and the E ring 194,
The paper feed roller 180 is supported by the rotating shaft 126 while maintaining balance.

When the number of recording media 150 stacked on the middle plate 112 of the paper feeding device 170 is too large or when the mounting error of each component is large, as shown in FIG.
Both ends of 2 bend downwards. In this case, the paper feed roller 180
Is not swingable in the direction of arrow D, the inner portion 180a of the paper feed roller 180 makes strong contact with the recording medium 150 and the outer portion 180b hardly makes contact with the recording medium 150. However, the paper feed roller 180 is formed with a through hole 186 having a larger inner diameter toward the outlet, and the paper feed roller 180 can swing in the direction of arrow D.

Therefore, even if both end portions of the intermediate plate 112 are bent downward due to too many recording media 150 stacked on the intermediate plate 112 and a large mounting error of each component. As shown in FIG. 6, the paper feed roller 180 swings in the direction of arrow D and stops at a position where the two paper feed rollers 180 contact the recording medium 150 with uniform pressure. As a result, when the recording medium 150 stacked on the intermediate plate 112 is fed, the two feeding rollers 180 contact the recording medium 150 with a uniform pressure and convey the recording medium 150.
It is possible to prevent conveyance failure and skew. In the above example, the paper feed roller 180 is formed with the through hole 186 having an inclined inner wall, but the inner wall may be formed so as to bend gently.
Further, a wave washer or rubber may be used instead of the torsion coil spring 192.

[0046]

As described above, in the first sheet feeding device of the present invention, the middle plate urging member can be installed even if the components such as the middle plate and the middle plate urging member have dimensional accuracy variations and mounting errors. While shaking along the direction in which the other side extends, the middle plate also shakes following this shaking. As a result of such shaking, the shaking of the middle plate stops and the middle plate is fixed at the position where the middle plate comes into contact with the paper feed roller with a uniform pressure, so that the medium is fed to the recording medium loaded on the middle plate. Since the rollers come into contact with each other with a uniform pressure, skewing of the recording medium can be prevented.

Here, when the middle plate urging member is formed at a position where the predetermined fixing position is opposed to the center of the other side portion, the fixing position which is the center of the swing is the other side of the middle plate. Since it is formed at a position facing the center of the portion, the other side has approximately the same weight with this center as a boundary. Therefore, the intermediate plate is easily balanced, and the intermediate plate comes into contact with the sheet feeding roller with a more uniform pressure. As a result, skewing of the recording medium is prevented more reliably. Further, according to the second paper feeding device of the present invention, since the inner diameter of the central portion of the through hole is smaller than the inner diameters of both end portions, the paper feeding roller can swing around the central portion of the through hole. Therefore, at the position where the middle plate comes into contact with the paper feed roller with a uniform pressure, the shaking of the paper feed roller is stopped and the paper feed roller is fixed, so that the paper feed roller is evenly distributed on the recording medium loaded on the middle plate. The contact of the recording medium can be prevented with a sufficient pressure, and the skew of the recording medium can be prevented.

Here, in the case where the paper feeding device is provided with the fixing members for fixing the paper feeding roller to the predetermined position of the rotation shaft, which are fixed to both ends of the paper feeding roller, the paper feeding roller is rotated by the fixing members. Since the shaft is fixed at a predetermined position, the paper feed roller comes into contact with almost the same position of the recording medium loaded on the intermediate plate. For this reason, skewing of the recording medium is more easily prevented.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a schematic configuration of an image forming apparatus to which a paper feeding device of the present invention is attached.

FIG. 2 is a perspective view showing a first embodiment of a paper feeding device,
A part of the middle plate is shown broken.

FIG. 3 is a cross-sectional view showing the paper feeding device of FIG. 2 from the front.

FIG. 4 is a perspective view showing a second embodiment of a paper feeding device,
A part of the middle plate is shown broken.

5 is a schematic diagram showing a structure of a paper feeding roller included in the paper feeding device of FIG.

FIG. 6 is a schematic view showing a state where a large number of recording media are stacked on the middle plate of the paper feeding device of FIG.

FIG. 7 is a perspective view showing a conventional sheet feeding device, in which a part of an intermediate plate is cut away.

8 is a cross-sectional view showing a side of the paper feeding device of FIG.

9 is a cross-sectional view showing the paper feeding device of FIG. 7 from the front.

FIG. 10 is a perspective view showing another example of the conventional sheet feeding device, in which a part of the intermediate plate is cut away.

11 is a schematic diagram showing a structure of a paper feed roller of the paper feed device of FIG.

12 is a schematic diagram showing a state where a large number of recording media are stacked on the middle plate of the paper feeding device of FIG.

[Explanation of symbols]

10 Copier 112 Middle plate 112a One side of middle plate 112b Other side of middle plate 114 cassette tub 120 axes 126 rotation axis 128, 180 paper feed rollers 160,170 paper feeder 162 Middle plate biasing member 164 step screw 186 through hole 192 torsion coil spring

Claims (4)

[Claims] 1. An intermediate plate on which a plurality of recording media are stacked, in which one side is fixed and the other side opposite to the one side moves up and down, and the other side from below the intermediate plate. An intermediate plate urging member for urging the portion upward, and a paper feed roller disposed above the other side portion and rotating at a predetermined timing,
By rotating the sheet feeding roller in a state where the sheet feeding roller is in contact with the recording medium loaded on the intermediate plate, the recording medium loaded on the intermediate plate is moved in a direction intersecting with the other side portion. In the sheet feeding device that feeds the sheets one by one, the middle plate urging member is capable of freely swinging along a direction in which the other side extends with a predetermined fixed position as a center, and the middle plate is A sheet feeding device characterized by swinging following the swing of a middle plate urging member. 2. The sheet feeding device according to claim 1, wherein the middle plate urging member is formed such that the predetermined fixed position is opposed to the center of the other side portion. . 3. An intermediate plate on which a plurality of recording media are stacked, wherein one side is fixed and the other side opposite to the one side moves up and down, and the other side from below the intermediate plate. Middle plate urging member for urging the sheet portion upward, a sheet feeding roller disposed above the other side portion and having a through hole formed in the longitudinal direction, and penetrating the through hole at a predetermined timing. And a rotation shaft that rotates with the rotation shaft, and intersects the other side portion by rotating the paper feed roller together with the rotation shaft in a state where the paper feed roller is in contact with the recording medium loaded on the middle plate. In a paper feeding device that feeds the recording mediums stacked on the middle plate one by one, the inner diameter of the through hole of the paper feeding roller is smaller than the inner diameters of both ends. Characteristic paper feeding device. 4. The paper feeding apparatus according to claim 3, further comprising fixing members that fix the paper feeding roller at a predetermined position of the rotation shaft and are fixed to both ends of the paper feeding roller. .