JP2000044080A - Cleaning device of paper feed roller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently remove toner or paper powder stuck to a paper feed roller by providing a cleaning roller pressure contacted with a paper feed roller, and forming the cleaning roller out of silicone rubber of which the rubber hardness is set to a specific numeral value or less. SOLUTION: In the paper refeed device 97 of a copying machine, because a paper feed roller 204 is rotated under the condition in which recording paper is pressed from the upper side by a recording paper pressing mechanism 203, the recording paper is fed into the nip part of a pair of separation rollers 201, 202. A cleaning roller 205 removing dirt of a pair of the separation rollers 201, 202 is formed out of silicone rubber of excellent adsorption for paper powder or toner. This silicone rubber is set to be JIS A 20 degrees or less in rubber hardness, and to be 1.5 or over in friction coefficient μ. Accordingly the percentage content of dimethylsilicone oil in the silicone rubber is set to be 3% or less, and the percentage content of low molecular siloxane is set to be 3000 ppm or over.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper feed roller cleaning device in an image forming apparatus such as a copying machine.

[0002]

2. Description of the Related Art Some copiers can perform double-sided copying. In such a copying machine, the recording paper on which the transfer to the first side has been completed is stored in a state of being superimposed on the intermediate tray. The recording sheets stored in the intermediate tray are sent to the re-feeding device, and then fed one by one by the re-feeding device. The recording paper fed by the re-feeding device is sent to the transfer position, where the transfer to the other side is performed.

As a re-feeding device, there is a re-feeding device that feeds a plurality of recording sheets sent in a state of being superposed on the re-feeding device one by one from below. As this kind of sheet re-feeding device, for example, a pair of upper and lower separating rollers, a recording paper pressing member, and a recording paper pressed in a state of being overlapped with a standby position where the recording paper pressing member is pressed against a stopper are pressed from above. The recording paper pressing mechanism that swings between the pressing position and the recording paper is disposed below the recording paper, and rotates when a plurality of recording papers are pressed from above by the recording paper pressing member of the recording paper pressing mechanism. In some cases, a paper feed roller for feeding the recording paper to the nip portion of the separating roller pair is provided.

In such a paper re-feeding device, when the paper feeding operation is repeatedly performed, toner and paper dust adhere to the separating roller pair, so that the recording paper becomes dirty when passing through the separating roller pair. There is a problem that the separating function of the pair of separating rollers is reduced.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a cleaning device for a paper feed roller which can efficiently remove toner and paper dust adhering to the paper feed roller.

[0006]

The first paper feed roller cleaning device according to the present invention is provided with a cleaning roller in a state of being pressed against the paper feed roller, and the cleaning roller has a rubber hardness of JIS A of 20. It is characterized by being formed of a silicone rubber of a degree or less.

In a second paper feed roller cleaning device according to the present invention, a cleaning roller is provided in pressure contact with the paper feed roller, and the cleaning roller is made of silicone rubber having a static friction coefficient of 1.5 or more. It is characterized by having.

In a third paper feed roller cleaning device according to the present invention, a cleaning roller is provided in a state of being pressed against the paper feed roller. The cleaning roller has a rubber hardness of 20 degrees or less according to JIS A and a coefficient of static friction. Is formed of 1.5 or more silicone rubber.

In a fourth cleaning device for a paper feed roller according to the present invention, a cleaning roller is provided in pressure contact with the paper feed roller, and the cleaning roller is formed of silicone rubber. the content of dimethyl silicone oil, which is internally added in the rubber is not more than 3%, the content of low molecular siloxane in the silicone rubber (D ₁₁ ~ ₂₀₎ is 3
000 ppm or more.

In the first to fourth paper feed roller cleaning devices, it is preferable that the surface of the cleaning roller is polished in order to form irregularities on the surface of the cleaning roller and increase the adhesiveness.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a copying machine will be described below with reference to the drawings.

[1] Description of Overall Configuration of Copier

FIG. 1 shows the overall configuration of a copying machine.

The copying machine includes a copying machine body 1 and a paper feed unit 2 fixed adjacent to the copying machine.

A contact glass 4 is provided on an upper surface of the case 3 of the copying machine main body 1. An automatic document feeder 5 is provided above the contact glass 4. A sorter 6 is provided on the side of the case 3 opposite to the side where the sheet feeding unit 2 is located. In Case 3, an exposure mechanism,
A print mechanism and a recording paper transport mechanism are provided.

The printing mechanism has a photosensitive drum 11. Around the photosensitive drum 11, in the order of its rotation, a charger 12 for charging the photosensitive layer on the surface of the photosensitive drum 11, and a blank lamp 1 for forming a margin.
3. a developing device 14 for visualizing the electrostatic latent image formed on the photosensitive layer as a toner visualized image; a transfer discharger 15 for transferring the toner visualized image formed on the photosensitive layer to recording paper; A discharger 16 for separating recording paper from the drum 11,
A cleaning device 17 for removing the toner remaining on the photosensitive drum 11 after the transfer and a static eliminator 18 for removing charges on the surface of the photosensitive drum 11 are provided.

At a position between the charger 12 and the developing device 14 on the surface of the photosensitive drum 11, exposure is performed by irradiating the reflected light from the original, and an electrostatic latent image is formed on the photosensitive layer. Is done.

The exposure mechanism includes an exposure lamp 21 for exposing and scanning an image of a document placed on the contact glass 4.
And a first optical system traveling body 31 provided with a reflection mirror 22 for reflecting light reflected from the original, and second and third mirrors 23 and 24 for guiding the light reflected by the first mirror 22 to the lens 25. And a fourth mirror 26 for guiding the light emitted from the lens 25 to the surface of the photosensitive drum 11.

The first optical system traveling body 31 and the second optical system traveling body 32 are reciprocated in the left-right direction by a scan motor (not shown). The second optical system traveling body 32 moves at a speed that is half the speed of the first optical system traveling body 31 and a distance that is half the moving distance of the first optical system traveling body 31.

The recording paper transport mechanism will be described. For each paper feed cassette 41, 42, 43 in the paper feed unit 2,
Paper feed rollers 51, 52, 53 for feeding recording paper and a pair of separating rollers 54, 55, 56 for preventing double feeding of the fed recording paper are provided.

The recording paper fed from the uppermost paper feed cassette 41 is sent to registration roller pairs 81 and 82 via first to sixth feed roller pairs 61 to 66. The recording paper fed from the middle paper cassette 42 is fed to the registration roller pair 8 via the third to sixth feed roller pairs 63 to 66.
1, 82. The recording paper fed from the lowermost paper feed cassette 43 is fed to the fifth and sixth feed roller pairs 6.
5 and 66 are sent to a pair of registration rollers 81 and 82.

The recording paper sent to the pair of registration rollers 81 and 82 is sent to a transfer position around the photoconductor drum 11 by the pair of registration rollers 81 and 82, and the toner paper formed on the photoconductor drum 11 is exposed. The image is transferred, and thereafter, is separated from the photosensitive drum 11. The recording paper peeled off from the photoconductive drum 11 is sent to a pair of fixing rollers 92 by a conveyor belt 91, and the toner image transferred to the recording paper is fixed on the recording paper. Thereafter, the sheet is discharged onto the sorter 6 by the eighth feed roller pair 68.

In the double-sided copy mode, the recording paper on which the transfer to the first side has been performed passes through the fixing roller pair 92, and then is sent to the intermediate tray 96 via the separating claw 93, the stock conveying section 94, and the reversing device 95. And the intermediate tray 96
Is stored once. The recording paper stored in the intermediate tray 96 (or a plurality of recording papers when copying images of a plurality of originals) is sent to a re-feeding device 97 by a feeding mechanism (not shown). The plurality of recording sheets sent to the re-feeding device 97
After the sheet is fed one by one by the re-feeding device 97, the ninth to
The sheet is fed to registration roller pairs 81 and 82 via an eleventh feed roller pair 69 to 71 and a sixth feed roller pair 66.

FIG. 2 shows the details of the drive mechanism of the pair of resist rollers 81 and 82.

The shaft 101 to which the upper registration roller 81 is fixed is connected to the frames 111 and 11 supported by the case 3.
2 is rotatably mounted via bearings 113 and 114. Similarly, the shaft 102 to which the lower registration roller 82 is fixed is connected to the frame 1 supported by the case 3.
11 and 112 are rotatably mounted via bearings 115 and 116.

Both shafts 101, 102 are geared 117,
It is connected via 118. The shaft 101 is the gear 12
1, 122 are connected to a shaft 123 driven by a motor (not shown). Therefore, when the shaft 123 is rotationally driven, the upper shaft 101 rotates, and accordingly, the lower shaft 102 also rotates.

The bearing 11 supporting the lower shaft 102
5, 116 are attached to the frames 111, 112 so as to be able to move up and down by a small amount. These bearings 115 and 116 are urged upward against the frames 111 and 112 by compression springs 124 and 125. As a result, the lower roller 82 comes into pressure contact with the upper roller 81.

When the recording paper is sent to the pair of registration rollers 81 and 82, the pair of registration rollers 8
Numerals 1 and 82 are in a driving stop state. However, when the recording paper sent to the pair of registration rollers 81 and 82 collides with the pair of registration rollers 81 and 82, the pair of registration rollers 81 and 82 idles, and the recording paper moves between the pair of registration rollers 81 and 82. There is a possibility that such a situation may occur. When this occurs, the transfer position to the recording paper is shifted.

Therefore, in this embodiment, a torque limiter 130 is provided on the shaft 101, as shown in FIGS. The torque limiter 130 includes an inner race 131 and an outer race 132 as is well known.
The inner ring 131 of the torque limiter 130 is fixed to the shaft 101 by a spring pin 133. The outer ring 132 of the torque limiter 130 is fixed to the frames 111 and 112 via a mounting member 134 and the like.

As the torque limiter 130, the inner ring 131 and the outer ring 132 are always connected with a predetermined connecting force by a magnetic force, a spring, or the like, and a constant or more rotational torque is applied to the inner ring 131 in the recording paper feed direction. When the inner ring 131 is rotated relative to the outer ring 132, a structure is used in which the connecting force is weakened when the inner ring 131 rotates.

More specifically, a torque limiter 130 is used that rotates the inner ring 131 with respect to the outer ring 132 when a rotation torque of 800 gfcm or more is applied to the inner ring 131 in the recording paper feed direction. When the shaft 123 is driven to rotate, the gears 122 and 121 and the shaft 10
1 to the inner ring 131 in the recording paper feed direction by about 5 kgf.
cm of rotation torque is applied, and the inner race 131
Rotate against. That is, the shaft 101 rotates.

On the other hand, when the shaft 123 is not driven to rotate, even if the recording paper collides with the pair of registration rollers 81 and 82, the inner ring 131 (shaft 101) is actuated by the coupling force acting between the inner ring 131 and the outer ring 132. Does not rotate, that is, since the registration roller pairs 81 and 82 do not idle,
It is possible to prevent the recording paper from entering between the pair of registration rollers 81 and 82.

FIG. 4 shows the details of the sheet re-feeding device 97.

The re-feeding device 97 is a device for feeding the recording paper sent in a state of being superposed on the re-feeding device 97 one by one from below. The re-feeding device 97 includes a pair of separating rollers (a pair of paper feed rollers) 201 and 202, a recording paper pressing mechanism 203 for pressing the superposed recording papers from above, and the recording paper pressing mechanism 203. The paper feed roller 204 that feeds the recording paper to the nip portion of the pair of separating rollers 201 and 202 by being rotated while being pressed from the cleaning roller 2 that removes dirt from the pair of separating rollers 201 and 202.
A recording paper front end regulating member 206 is provided for preventing a plurality of recording papers from being fed to the nip portion of the pair 05 and the separating roller pair 201, 202.

The pair of separating rollers 201 and 202 is composed of a reverse roller 201 and a forward roller 202 which are arranged at the center of the width of the recording paper transport path so as to vertically sandwich the recording paper transport path. The upper roller is a reverse roller 201, and the lower roller is a forward roller 202.
It is. The normal rotation roller 202 is driven to rotate in the recording paper feed direction by a drive mechanism (not shown).

The reverse roller 201 is driven by a drive mechanism (not shown) to rotate the recording paper in the direction opposite to the recording paper feeding direction (recording paper return direction). For the reverse roller 201, a torque limiter (not shown) for canceling power transmission from a drive source to the reverse roller 201 when the torque in the recording paper feed direction transmitted to the reverse roller 201 becomes a predetermined value or more. Is provided.

The two paper feeding rollers 204 are attached to a shaft 211 disposed below the recording paper transporting path and extending in a direction perpendicular to the recording paper transporting direction at an interval in the axial direction. The cross-sectional shape of the paper feed roller 201 is a missing circle in which a part of a circle is missing. The feed roller 204 is always
As shown by the solid line in FIG. 4, the motor is stopped at a rotational position where the missing portion is directed upward.

The recording paper pressing mechanism 203 is provided with a recording paper transporting path interposed therebetween and swingable about a lower end thereof, and a recording paper pressing member attached between upper ends of both arms 221. 222.

The recording paper pressing member 222 includes two arms 221.
A pair of mounting plate portions 231 rotatably mounted via pins 223 to the upper end portions of the mounting plates 231, and a curved plate portion 232 formed between the mounting plate portions 231. A bent portion 232a is formed at the lower end of the curved plate portion 232.

The arm 221 is normally urged in the clockwise direction by a tension spring (arm urging spring) (not shown). As shown by a solid line in FIG. The portion 232a is stopped in a state where the tip of the portion 232a contacts the regulating member 206. This stop position is referred to as a standby position.

When the recording paper is fed, the arm 221 is swung counterclockwise by operating an arm driving solenoid (not shown), and as shown by a chain line in FIG. The pressing member 222 presses the recording paper from above. This position is referred to as a pressing position. Then, when the operation of the arm driving solenoid is stopped, the arm 221 is returned to the standby position by the urging force of the arm urging spring.

The recording paper front end regulating members 206 are respectively attached to a pair of fixing members 213 disposed outside the both ends of the separating roller 201. The fixing member 213 is supported by the case 3 of the copying machine main body 1 and has a vertical surface 213a facing the direction opposite to the recording paper transport direction.

The recording paper front end regulating member 206 is a fixing member 2
13, an elastic member 241 fixed to the vertical surface 213a,
The flexible member 242 is fixed to the elastic member 241 and has a lower end extending below the elastic member 241. The elastic member 241 is formed of a thin plate sponge, and the flexible member 242 is formed of a synthetic resin film.

The cleaning roller 205 is in pressure contact with the forward rotation roller 202 of the pair of separation rollers 201 and 202, and rotates with the rotation of the forward rotation roller 202. The rubber hardness of the pair of separating rollers 201 and 202 is about 30 degrees according to JIS A. The cleaning roller 205 is provided for removing paper dust and toner attached to the forward rotation roller pair 202. The cleaning roller 205 is
It is formed of silicone rubber having high adsorptivity of paper powder and toner.

The rubber hardness of the silicone rubber used for the cleaning roller 205 is as shown in the experimental results of Table 1 in which the ability to remove paper dust and toner attached to the normal rotation roller 202 is measured for each cleaning roller having a different rubber hardness. 20 degrees or less according to JIS A, preferably 1 degree
0 degrees or less is good. In Table 1, ◎ indicates that the ability to remove paper dust and toner was very high, ○ indicates that the ability to remove paper dust and toner was high, and △ indicates that the ability to remove paper dust and toner was low. Is shown. Since it is difficult to quantitatively measure the ability to remove paper dust and toner, the results are visually determined.

[0046]

[Table 1]

The lower the rubber hardness of the silicone rubber forming the cleaning roller 205, the higher the ability to remove paper dust and toner becomes. It is considered that this is because the contact area increases, that is, the nip area between both rollers increases.

The static friction coefficient μ of the cleaning roller 205
As can be seen from the experimental results in Table 2 in which the removal ability of the paper dust and toner attached to the normal rotation roller 202 is measured for each cleaning roller having a different static friction coefficient, the value is preferably 1.5 or more, and more preferably 1.8 or more. Good. Also in Table 2, ◎ indicates that the ability to remove paper dust and toner was very high, and ○ indicates that the ability to remove paper dust and toner was high.
A mark indicates that the ability to remove paper dust and toner is low. Since it is difficult to quantitatively measure the ability to remove paper dust and toner, the results are visually determined.

[0049]

[Table 2]

The higher the coefficient of friction of the cleaning roller 205, the higher the ability to remove paper dust and toner is as follows.
It is considered that the higher the coefficient of friction of the cleaning roller 205, the greater the adhesiveness of the cleaning roller 205.

FIG. 5 shows a method of measuring the static friction coefficient of the cleaning roller 205.

The plain paper 30 is placed on a fluororesin substrate 301.
Put 2 on. The cleaning roller 205 is placed thereon in a non-rotatable state. A load of 100 g is applied to the cleaning roller 205 by the weight 303. Plain paper 302
And load cell 304 is pulled so that the paper feed speed of plain paper 302 becomes 3000 mm / min. And the paper feed speed is 300
At 0 mm / min, the load applied to the plain paper 302 is detected by the load cell 304.

The static friction coefficient μ is defined as A (in this case, 100 g), the load applied to the cleaning roller 205 by the weight 303, and the paper feeding speed is 3000 mm / min.
If the tensile load (measured value by the load cell 304) applied to the plain paper 302 is B in the case of, it can be obtained by the following equation 1.

[0054]

(Equation 1)

When the cleaning roller 205 is formed of silicone rubber, the content of dimethyl silicone oil internally added to the silicone rubber and the content of low molecular siloxane (D ₁₁ to D ₂₀ ) in the silicone rubber Rate affects the coefficient of static friction μ. Siloxane is SiO
H ₂ (N), and the suffixes 11 to 11 in the above D ₁₁ to D ₂₀
Reference numeral 20 denotes the number of connected N atoms in SiOH ₂ (N).

The higher the content of dimethyl silicone oil added to the silicone rubber, the smaller the coefficient of static friction μ. In addition, the higher the content of the low-molecular siloxane (D ₁₁ to D ₂₀ ) in the silicone rubber, the larger the static friction coefficient μ.

The static friction coefficient μ of the cleaning roller 205
Is adjusted to 1.5 or more, the content of dimethyl silicone oil internally added to the silicone rubber is reduced to 3% or less, and the low-molecular siloxane (D ₁₁ to
₂₀ ) is preferably 3000 ppm or more.

In this embodiment, as the cleaning roller 205, a roller entirely made of silicone rubber is used. Cleaning roller 2
As the silicone rubber forming No. 05, the rubber hardness is J
5 degrees in IS A and a coefficient of static friction μ of 1.8
Is used. Further, the surface of the cleaning roller 205 is polished with a grindstone in order to form irregularities on the surface of the cleaning roller 205 and improve the adhesiveness. For this reason, the cleaning roller 2
05, the paper dust and toner attached to the normal rotation roller 202 can be efficiently removed.

The polishing of the surface of the cleaning roller 205 will be described. As shown in FIGS. 6 and 7, the grindstone 401 is pressed against the cleaning roller 205, and one is rotated clockwise and the other is rotated counterclockwise. In this example, the diameter of the grindstone 401 is 405 mm, and the diameter of the cleaning roller 205 is 18 mm. Then, the grindstone 401 is driven to rotate counterclockwise at a rotation speed of 2100 rpm, and the cleaning roller 205 is driven to rotate clockwise at a rotation speed of 150 rpm. In addition, whetstone 4
01 is moved horizontally in the direction indicated by arrow A in FIG. When such polishing is performed, as shown in FIG.
Spiral irregularities are formed on the surface of the cleaning roller 205. The reason will be described.

Silicon rubber having a rubber hardness of 15 degrees or less according to JIS A has a low tensile strength (10 kg / c
m ² or less), breaking elongation is high (500% higher) it tends. For this reason, when the polishing process is performed, the rubber material is not cut by the abrasive grains of the grindstone as in the case of a normal rubber material, but a process of stretching and tearing the rubber material is performed. Further, the abrasive powder itself has a tackiness, is hard to be removed from the roll surface, enters between the roll and the grindstone, and moves along with the roll surface. As a result, the cleaning roller 2
Spiral irregularities are formed on the surface of 05.

As described above, the cleaning roller 205
In this case, the paper dust and the toner are easily adsorbed, so that the paper dust and the toner attached to the normal rotation roller 202 are efficiently removed. However, when the amount of paper dust, toner, dust, etc. attached to the surface of the cleaning roller 205 increases, the effect of removing the paper dust and toner attached to the normal rotation roller 202 decreases. Therefore, in this embodiment, a scraper 2 for scraping the surface of the cleaning roller 205 little by little.
Reference numeral 07 is provided in a state of being pressed against the cleaning roller 205. As the material of the scraper 207, a hard resin, metal, or the like is used.

The operation of the re-feeder 97 will be described.

When a plurality of recording sheets are sent to the re-feeding device 97, the re-feeding device 97 performs a feeding operation at predetermined time intervals. One recording sheet is fed by one sheet feeding operation.

One sheet feeding operation is performed as follows. First, when the arm driving solenoid is operated, the arm 221 of the recording paper pressing mechanism 203 swings counterclockwise, and the recording paper pressing member 222 is moved to the pressing position indicated by the chain line in FIG. .

In this state, when the paper feed roller 204 is rotated, the recording paper is separated from the pair of rollers 201, 201.
It is sent to the nip 202. At the same time, the pair of separating rollers 201 and 202 are driven to rotate, and one sheet of recording paper is fed.

When the feeding of one sheet is completed, the operation of the arm driving solenoid is stopped, and the driving of the sheet feeding roller 204 and the pair of separating rollers 201 and 202 are stopped.

When the operation of the arm driving solenoid is stopped, the arm 221 is swung clockwise by the urging force of the arm urging spring and returns to the standby position. When the arm 221 returns to the standby position, the leading end of the folded portion 232a of the recording paper pressing member 222 is
13 collides with the regulating member 206 fixed to the thirteen. Since the regulating member 206 is constituted by the elastic member 241 made of sponge and the flexible member 242 made of film, the collision sound when the recording paper pressing mechanism 203 returns to the standby position can be extremely reduced.

By the way, when the paper feeding operation is repeatedly performed, toner and paper dust adhere to the separating roller pair 201 and 202. The cleaning roller 205 rotates with the rotation of the normal rotation roller 202 in a state where the cleaning roller 205 is pressed against the normal rotation roller 202 of the pair of separation rollers 201 and 202, so that the toner and paper dust adhering to the normal rotation roller 202 are removed from the cleaning roller 205. Adsorb to.

In this embodiment, the cleaning roller 205 is made of silicone rubber having a lower hardness than the pair of separating rollers 201 and 202.
The toner and paper dust attached to the cleaning roller 205 are efficiently adsorbed by the cleaning roller 205. Further, silicone oil may adhere to the recording paper fed by the re-feeding device during the first fixing process on one side, but since the cleaning roller 205 is formed of silicone rubber, the silicone rubber is not cleaned. The cleaning roller 205 does not deteriorate even if it adheres to the roller 205.

Since the surface of the cleaning roller 205 is scraped off little by little by the scraper 207,
The high toner and paper powder attraction of the cleaning roller 205 can be maintained for a long period of time. When the cleaning roller 205 has been consumed to some extent or more, it may be replaced.

[0071]

According to the present invention, a paper feed roller cleaning device capable of efficiently removing toner and paper dust adhering to the paper feed roller can be obtained.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing an overall configuration of a copying machine.

FIG. 2 is a side view showing details of a drive mechanism of a pair of resist rollers.

FIG. 3 is a partially enlarged sectional view of FIG. 2;

FIG. 4 is a cross-sectional view illustrating a configuration of a sheet re-feeding device.

FIG. 5 is a schematic view illustrating a method for measuring a static friction coefficient of the cleaning roller 205.

FIG. 6 is a front view illustrating a state where the surface of the cleaning roller 205 is being polished.

FIG. 7 is a right side view of FIG.

[Explanation of symbols]

 81, 82 Registration roller pair 130 Torque limiter 97 Re-feeding device 201, 202 Separation roller pair (paper feed roller pair) 203 Recording paper pressing mechanism 204 Paper supply roller 205 Cleaning roller 206 Recording paper front end regulating member 207 Scraper 213 Fixing member 221 Arm 222 Recording paper pressing member 241 First elastic member 242 Second elastic member

Claims (5)

[Claims] A cleaning roller is provided in pressure contact with a paper feed roller.
A paper feed roller cleaning device made of silicone rubber having a rubber hardness of 20 degrees or less according to JIS A. 2. A cleaning roller is provided in a state of being pressed against a paper feed roller.
A paper feed roller cleaning device made of silicone rubber having a static friction coefficient of 1.5 or more. 3. A cleaning roller is provided in a state in which the cleaning roller is pressed against the paper feed roller.
A paper feed roller cleaning device made of silicone rubber having a rubber hardness of 20 degrees or less according to JIS A and a static friction coefficient of 1.5 or more. 4. A cleaning roller is provided in pressure contact with the paper feed roller. The cleaning roller is formed of silicone rubber, and dimethyl silicone oil internally added to the silicone rubber forming the cleaning roller is provided. content of 3% or less, the content of low molecular siloxane in the silicone rubber (D ₁₁ ~ ₂₀₎ 30
A cleaning device for a paper feed roller having a concentration of 00 ppm or more. 5. The cleaning roller according to claim 1, wherein the surface of the cleaning roller is polished in order to form irregularities on the surface of the cleaning roller and increase the adhesiveness.
5. The cleaning device for a paper feed roller according to any one of items 3 and 4.