JPH03293388A - Cleaning blade and device using the same - Google Patents

Abstract

PURPOSE:To prolong the service life without damaging an image carrier such as a photosensitive body and also, to produce the cleaning blade being excellent in productivity and quality by using a silicone rubber composite having specific composition and characteristic. CONSTITUTION:As for a silicone rubber composite, the organosiloxane component of low viscosity contained in silicone rubber is <= 5 weight %, hardness of rubber is 40 - 90 degrees in JISA, and compression is <= 20%. When the siloxane component is excessive, since lower viscosity oil oozes out to the surface of an image carrier at the time of press-contacting of a blade, it is undesirable. Also, when the hardness of rubber is too low, frictional force at the time of sliding is increased and an initial inversion is apt to occur, and on the other hand, when it is too hard, it becomes the cause of a damage to the surface of the carrier. As for this composite, its friction coefficient is small and it wears out itself to fine power 5, and it becomes a lubricating medium and cleans a toner 4.

Description

[Detailed description of the invention] [0001]

[Industrial application field]

The present invention relates to an image forming apparatus such as an electrostatic copying machine, a printer or a facsimile machine, and in particular to a cleaning blade used in the cleaning device thereof, which presses against the surface of an image carrier to clean and remove toner remaining on the surface, and an apparatus using the same. It is something [0002]

[Conventional technology]

In well-known image forming apparatuses that repeat the process of transferring a transferable toner image formed on the surface of an image carrier onto a transfer material such as paper, it is necessary to clean the toner remaining on the surface of the image carrier without being transferred after each transfer process. It is essential to remove them. For this purpose, a highly precise edge is formed on the rubber elastic body, and by displacing the rubber elastic body uniformly and accurately on the surface of the image carrier, uniform pressure contact is made between the blade and the image carrier, and the image is A method of cleaning and removing residual toner by rubbing the surface of the carrier is widely used, and urethane rubber is used as the cleaning blade. [0003] However, in the cleaning process using urethane rubber, since the friction coefficient of urethane rubber is large, the frictional force between the urethane rubber and the image carrier is also very large, and the cleaning blade is simply pressed against the image carrier. So,
During initial sliding, the cleaning blade 3 made of urethane rubber supported by the support member 2 may flip over or bounce off the image carrier such as the electrophotographic photosensitive drum 1 as shown by the dotted line in FIG. There was a problem that made it impossible. [0004] For this reason, conventionally, lubricating fine powder of a fluororesin such as polyvinylidene fluoride or polytetrafluoroethylene is coated on the tip of a urethane rubber cleaning blade or on the surface of the photoreceptor to prevent the gap between the urethane rubber and the photoreceptor. Methods to reduce the frictional force during initial sliding have been studied and implemented. but,
If these lubricating fine powders are applied in large quantities, they will affect the image due to their electrical properties, so it is necessary to apply them as little and evenly as possible, but this is technically difficult and may result in variations in application, which may affect reliability in terms of reversal and momentum. I was left with a problem. [0005] Furthermore, as the cleaning process is repeated, lubricating fine powder also scatters from near the edge of the blade, reducing its effectiveness as a lubricant, but instead of this, toner comes to play the role of lubricant. However, the urethane blade does not reduce the frictional force as much as the powder does, and as a result, the urethane blade damages or wears out the photoreceptor, especially the organic photoconductor, resulting in a shortened lifespan of the photoreceptor. [0006] In addition, the urethane rubber material used in this type of cleaning blade has good abrasion resistance against the photoreceptor, etc., and there is no contamination of the photoreceptor, toner, etc. by components leached from the urethane rubber. Since then, thermosetting liquid urethane materials have been used. However, this type of urethane material requires a long reaction time to heat cure and is highly reactive with moisture in the air, leaving problems with management in terms of manufacturing equipment costs and material quality. Therefore, a manufacturing method that solves these problems has been desired. [0007]

[Problem to be solved by the invention]

The problems to be solved are to provide a cleaning blade that has a small coefficient of friction and does not damage the surface of an image carrier, and also to provide a cleaning blade that is easy to manufacture and has consistent quality. [0008]

[Means to solve the problem]

The present invention provides a cleaning blade used in a cleaning device for cleaning and removing toner powder remaining on the surface of an image bearing member, the material of which is a silicone rubber composition, and a low viscosity organosiloxane contained in the silicone rubber. The component is 5% by weight or less, and the rubber hardness is JISA.
This cleaning blade is characterized by having a compression set of 20% or less at an angle of 40 to 90 degrees. [0009] The cleaning blade according to the present invention has a small coefficient of friction, and as shown in FIG. 2, it self-wears itself into very small amounts of fine powder 5 without damaging the surface of the photoreceptor drum 1, and the very small amount of abrasion powder is removed. serves as a lubricating medium and can clean the toner 4 with low friction sliding. In addition, the cleaning blade is manufactured using rubber injection molding, making it simple and reliable. [0010] By using the cleaning blade of the present invention, it is possible to prevent reversal during initial sliding with the photoreceptor, prolong the life of the image bearing member such as the photoreceptor without the problem of scratches, and improve productivity. We can produce cleaning blades with high quality and high prices.
This provides an excellent cleaning effect. [0011] The rubber hardness of the silicone rubber forming the cleaning blade is determined from the viewpoint of cleaning performance of residual toner.
It is set so that it is pressed against the image carrier at a predetermined distance and load to achieve a predetermined pressure, but if the hardness is too low, the pressure will be insufficient or the rubber will become weak and the cleaning blade will come into contact with the image carrier with a large surface. This increases the frictional force during sliding and worsens the sliding properties, so it is preferable to have a hardness of 40° or more according to JISA, and a cleaning member with a hard hardness may cause scratches on the surface of the image carrier. 9 in JISA
It is preferably 0' or less. Furthermore, more preferably,
JISA 50° to 80° is preferable. [0012] When the fluctuation range of the pressure contact force of the cleaning member against the image bearing member decreases below a predetermined minimum pressure contact, there is a problem in that the remaining toner cannot be cleaned. Therefore, it is necessary to maintain the pressure contact force. be. However, since rubber is subject to irreversible deformation, or creep, which occurs due to plastic flow within the rubber in response to pressure, a cleaning member with a small deformation is preferable, and as a guideline, a compression set of 20 % or less is preferable. More preferably, the compression set is 10% or less. [0013] Normally, silicone rubber contains a low-molecular-weight polysiloxane oil of about 20 centipoise or less as a low-viscosity component when synthesizing silicone rubber raw materials, but if this component is large, it may cause edges on the image carrier. When the formed silicone rubber cleaning blade is pressed, the surface pressure reaches several tens of kg/cm 2 , and this low viscosity oil seeps onto the surface of the image carrier, affecting the electrostatic photographic process. For this reason, a silicone rubber material containing a small amount of this low-viscosity oil component is preferable, and a content of 5 wt% or less is preferable. More preferably, it is 3 wt% or less. [0014] The silicone rubber material includes room temperature curing type RTV,
Any type of rubber, such as low-temperature curing LTV or high-temperature curing HTV, can be used as long as it satisfies the above conditions. LTV, which is an addition-type liquid silicone rubber with relatively little molding shrinkage, is more preferable. [0015] In order to give the silicone rubber cleaning blade an extremely small amount of abrasion resistance, a filler having an extremely small average particle size is added, but the particle size of this filler is larger than that of the toner particles used in electrostatic photography. If it is larger than the diameter, the roughness of the edge formed on the cleaning blade that comes into pressure contact with the image carrier when dispersed in silicone rubber will become large, making it impossible to clean the toner, or the worn out part of the silicone rubber cleaning blade. Since the particle size of the toner particles becomes larger than the toner particle size, problems such as a decrease in cleaning performance occur. For this reason, the filler added is preferably smaller in particle size than the toner particle size, more preferably 1 μm or less. Also, regarding the amount of filler added, it is better to add 5wt% or more from the viewpoints of viscoelastic mechanical properties of the silicone rubber cleaning blade, imparting minimal abrasiveness, and extending the durability life. good. [0016] The material of the filler to be added may be organic resin fine powder, such as ultra-high density polyethylene, nylon, fluorine resin, etc., or inorganic fine powder, as long as it satisfies the above-mentioned characteristics. , for example, may be one-component or multi-component such as molybdenum disulfide, fluorocarbon, and silica. In particular, from the viewpoint of particle size, dispersibility in silicone rubber, and the problem of scratches on the surface of the image carrier, fine powder silica, such as wet silica and dry silica, is preferred. The organosiloxane component is preferably 5% by weight or less, and in terms of particle size, the dry silica or hydrophobic dry organosiloxane component is preferably 5% by weight or less. [0017] In the cleaning process, it is necessary to accurately apply the cleaning blade to the image bearing member, for example, a cylindrical photosensitive drum with a curvature, to improve the cleaning performance. Need to do better. For this reason, the best method for manufacturing cleaning blades is to use an injection molding machine to mold a mold with high dimensional accuracy into a mold clamped under high pressure. As a result, the injection reaction time can be shortened, which is advantageous in terms of production. In addition, there is a problem that it is difficult to obtain strong adhesion between the support member and the molded silicone rubber, so during injection molding, the support member is coated with adhesive in advance at the part that will be bonded to the silicone rubber, and is inserted into the mold. It is preferable to mold it integrally with rubber so that it can be firmly bonded by utilizing the rubberization reaction during molding of silicone rubber. In this way, it is possible to obtain a cleaning blade that takes less time to form than a cleaning blade made of urethane rubber and is superior in quality. [0018] FIG. 3 shows a schematic configuration of a general transfer type electrophotographic apparatus using a drum-type photoreceptor. [0019] In FIG. 3, reference numeral 11 denotes a drum-type photoreceptor as an image carrier, which is rotated at a predetermined circumferential speed in the direction of the arrow around a shaft 11a. The photoreceptor 11 is charged by the charging means 1 during its rotation process.
2, the peripheral surface thereof is uniformly charged to a predetermined positive or negative potential, and then subjected to optical image exposure (slit exposure, laser beam scanning exposure, etc.) by an image exposure means (not shown) in the exposure section 13. As a result, electrostatic latent images corresponding to the exposed images are sequentially formed on the circumferential surface of the photoreceptor. [0020] The electrostatic latent image is then developed with toner by the developing means 14, and the toner developed image is transferred by the transfer means 5 from a paper feed section (not shown) between the photoreceptor 11 and the transfer means 15 as the photoreceptor 11 rotates. The images are sequentially transferred onto the surface of the transfer material P that is fed in synchronization. [0021] The transfer material P that has undergone the image transfer is separated from the photoreceptor surface and introduced into the image fixing means 18, where the image is fixed and printed out outside the machine as a copy. [0022] After the image has been transferred, the surface of the photoreceptor 11 is cleaned by the cleaning blade 16 according to the present invention to remove residual toner after transfer, and is further subjected to charge removal treatment by the pre-exposure means 17 to repeat image formation. used for. [0023] As the uniform charging means 12 for the photoreceptor 11, a corona charging device is generally widely used. Further, as for the transfer device 15, corona transfer means is generally widely used. An electrophotographic apparatus is constructed by combining a plurality of components such as the above-mentioned photoreceptor, developing means, and cleaning blade into an apparatus unit, and this unit is configured to be detachable from the apparatus main body. It's okay. For example, at least one of the charging means and the developing means is integrally supported with the photoreceptor and the cleaning blade to form a single unit that can be attached to and detached from the apparatus main body, and a guide means such as a rail of the apparatus main body is used. It may be configured to be detachable. At this time, the above-mentioned device unit may include a charging means and/or a developing means. [0024] In light image exposure, when an electrophotographic apparatus is used as a copying machine or a printer, the reflected light or transmitted light from the original, or the reading of the original is converted into a signal, and this signal is used to scan the laser beam. , driving an LED array, or driving a liquid crystal shutter array. [0025] When used as a facsimile printer, the optical image exposure is used to print received data. FIG. 4 is a block diagram showing an example of this case. [0026] The controller 21 controls the image reading section 20 and the printer 29. The entire controller 21 is controlled by a CPU 27. The read data from the image reading section is transmitted to the partner station through the transmitting circuit 23. Data received from the partner station is sent to the printer 29 through the receiving circuit 22. Predetermined image data is stored in the image memory. A printer controller 28 controls a printer 29 . 24 is a telephone. [0027] After the image received from the line 25 (image information from a remote terminal connected via the line) is demodulated by the receiving circuit 22, the CPU 27 decodes the image information and sequentially stores it in the image memory 26. Stored. and at least 1
When the image of the page is stored in the memory 26, the image of the page is recorded. The CPU 27 reads one page of image information from the memory 26 and sends the combined one page image information to the printer controller 28. When the printer controller 28 receives one page of image information from the CPU 27, it controls the printer 29 to record the image information of that page. [0028] Note that the CPU 27 is receiving the next page while the printer 29 is recording. [0029] As described above, images are received and recorded. [0030]

【Example】

How to make a cleaning blade Polysiloxane oil with a vinyl group at the end, TSE3032 (trade name of Toshiba Silicone) A solution containing a platinum catalyst and silica, a polysiloxane oil with a vinyl group at the end, a reaction inhibitor, hydrosilane and Using TSE3032 liquid B containing silica, the mixing ratio of each liquid, the amount of silica contained in each liquid, and the particle size of silica were determined in order to make the cleaning blade hardness after molding the value shown in Table 1. adjusted. The thus prepared raw material is injection molded using an injection molding material. The injection mold is preheated to 170°C, and a support member bonded with vulcanized adhesive is inserted into it.
Rubber was injected into a mold, and 60 seconds after injection, the molded blade was taken out of the mold and subjected to secondary vulcanization at 200° C. for 4 hours. After this, it was subjected to edge processing, etc., and then used as a cleaning blade. [0031] Regarding the cleaning blade molded as described above, reversibility during initial sliding and durability of 3000 sheets through an electrophotographic copying machine using an organic photoreceptor (manufactured by Canon, product name: Personal Copier FC-5) were evaluated. The degree of scratches on the surface of the photoreceptor and cleaning performance were evaluated. [0032] Example 1 Silica was added and dispersed to the main silicone rubber material and the curing material as follows. Main material TSE3032A (Two-component addition type liquid silicone manufactured by Toshiba Silicone) 100g Hydrophobic dry organosiloxane component: 5% by weight or less 1 piece Aerosil) RX-20010 - Primary particle size 14 mμ Curing material TSE3032B 10 Hydrophobic dry organosiloxane component 5% by weight or less (Nippon Aerosil) RX-2001 Molding conditions The supporting member, which has been adhesively treated with a vulcanized adhesive in advance, is inserted into the mold of a rubber injection molding machine, and the silica-added main material and hardening material are mixed in a ratio of 10:1. The mixture was injection molded while being mixed to match the appropriate ratio, and processed into a predetermined shape. Molding temperature 170℃ Molding time 60 seconds Secondary vulcanization temperature 200℃ Secondary vulcanization time 4 hours Molded product physical properties Rubber hardness J I SA56 Compression set (70℃) 7
% [0033] Example 2 Silica was added and dispersed to the main silicone rubber material and the curing material as follows. Main material TSE3032A (Two-component addition type liquid silicone manufactured by Toshiba Silicone) 100g Hydrophobic dry organosiloxane component is 5% by weight or less (Nippon Aerosil) RX-20020-Primary particle size 14 mμ Curing material TSE3032B 10 Hydrophobic dry organosiloxane component 5% by weight or less (Nippon Aerosil) RX-2002 Molding conditions The support member, which has been previously adhesively treated with a vulcanized adhesive, is inserted into the mold of a rubber injection molding machine, and the silica-added main material and hardening material are mixed in a ratio of 10:1. The mixture was injection molded while being mixed to match the appropriate ratio, and processed into a predetermined shape. Molding temperature 170°C Molding time 60 seconds Secondary vulcanization temperature 200°C Secondary vulcanization time 4 hours Molded product physical properties Rubber hardness JISA66 Compression set (70°C) 7% [
[0034] Example 3 Silica was added and dispersed to the main silicone rubber material and the curing material as follows. Main material TSE3032A (Two-component addition type liquid silicone manufactured by Toshiba Silicone) 100 gr Hydrophobic dry organosiloxane component is 5% by weight or less (Nippon Aerosil) RX-20010 - Primary particle size 14 mμ Curing material TSE3032B 10 Hydrophobic dry organosiloxane component 5% by weight or less (Nippon Aerosil) RX-2001 Molding conditions A support member that has been adhesively treated with a vulcanized adhesive in advance is inserted into a mold of a rubber injection molding machine, and the above-mentioned silica-added main material and hardening material are mixed in a ratio of 10:3. The mixture was injection molded while being mixed to match the appropriate ratio, and processed into a predetermined shape. Molding temperature 170℃ Molding time 60 seconds Secondary vulcanization temperature 200℃ Secondary vulcanization time 4 hours Molded product physical properties Rubber hardness J I SA76 Compression set (70℃) 6
% [0035] Example 4 Silica was added and dispersed to the main silicone rubber material and the curing material as follows. Main material TSE3032A (Two-component addition type liquid silicone manufactured by Toshiba Silicone) 10 gr Hydrophobic dry organosiloxane component is 5% by weight or less (Nippon Aerosil) RX-20010 - Primary particle size 14 mμ Curing material TSE3032B 10 Hydrophobic dry organosiloxane component 5% by weight or less RX
-2001 Molding Conditions The supporting member, which has been adhesively treated with a vulcanized adhesive in advance, is inserted into the mold of a rubber injection molding machine, and while mixing the above-mentioned silica-added main material and hardening material at a ratio of 10:0.7. It was injection molded and processed into a predetermined shape. Molding temperature 170℃ Molding time 60 seconds Secondary vulcanization temperature 200℃ Secondary vulcanization time 4 hours Molded product physical properties Rubber hardness J I SA46 Compression set (70℃) 8
% [0036] Example 5 Silica was added and dispersed to the main silicone rubber material and the curing material as follows. Main material TSE3032A (Two-component addition type liquid silicone made by Toshiba Silicone) 100 gr Wet silica (Tokuseal U: trade name; Tokuyama Soda) - Secondary particle size 20 mμ 10 Curing material TSE3032B 10 Wet silica (Tokuseal U: trade name; Tokuyama Soda) - Secondary particle size: 20 mμ 1. Molding conditions: Insert the supporting member, which has been previously bonded with vulcanized adhesive, into the mold of a rubber injection molding machine, and mix the above-mentioned silica-added main material and hardening material at a ratio of 10:1. It was then injection molded and processed into the desired shape. Molding temperature 170℃ Molding time 60 seconds Secondary vulcanization temperature 200℃ Secondary vulcanization time 4 hours Molded product physical properties Rubber hardness J I SA56 Compression set (70℃) 9
%[0037] Comparative Example 1 Rubber material Ethylene adipate urethane prepolymer Seal manufactured by Polyurethane Industries Mn1500 NCO6,2wt%)
100gr curing agent 1.4-butanediol 3.9gr trimethylolpropane 2.1 Molding temperature: 130°C Molding time: 30 minutes Secondary vulcanization temperature: 130°C Secondary vulcanization time: 4 hours Add a curing agent to the heated and dissolved urethane prepolymer. The mixture was mixed, poured into a heated mold, heated and cured, and processed into a predetermined shape. Molded product physical properties Rubber hardness J I SA62 Compression set (70°C) 9
% [0038] Comparative Example 2 Hard clay was added and dispersed in the main silicone rubber material and the curing material. A cleaning blade was otherwise formed in the same manner as in Example 1. [0039] Comparative Example 3 Commercial grade TSE1026 in which silica and other fillers are added and dispersed in the main silicone rubber material and the curing material respectively Main material A (two-component addition type liquid silicone made by Toshiba Silicone) 00gr TSE1026 Curing material B 100 Molding conditions The main material and the hardening material were molded in a 1:1 ratio using a rubber injection molding machine into which a support member which had been adhesively treated in advance was inserted, and after secondary vulcanization, an edge processing was performed to obtain a cleaning blade. Molding temperature 170°C Molding time 60 seconds Secondary vulcanization temperature 200°C Secondary vulcanization time 4 hours Molded product physical properties Rubber hardness JI SA62 Compression set (70°C) 12% [0040] Comparative example 4 Silicone rubber material main material Commercial grade TSE1026, which is made by adding and dispersing silica and other fillers to the hardening material and hardening material, respectively.Main material A (two-component addition type liquid silicone made by Toshiba Silicone) 00gr TSE1026 Hardening material B 100 Molding conditions Main material and hardening material 1:1 The cleaning blade was molded using a rubber injection molding machine into which a support member which had been previously adhesively treated was inserted so as to have a ratio of . Molding temperature: 170°C Molding time: 60 seconds Molded product physical properties Rubber hardness JISA58 Compression set (70°C) 30% or more A cleaning blade molded using an electrophotographic copier using an organic photoreceptor (manufactured by Canon, product name: Personal copier) FC-5), the reversibility during initial sliding, the degree of scratches on the photoreceptor surface after 3000 sheets of paper, and the cleaning performance were evaluated. The results are shown in Table 1. [0041]

[Table 1] Table 1 [0042] Note 1) Oil content... 5 g of silicone rubber sample was shredded in a Soxhlet extractor and diluted with 100 CC of hexane.
After extraction for 0 hours, hexane was cut from the hexane extract, and the weight of the extract was expressed as %. 2) Initial reversibility...〇-anti-reversal opening, ×-with reversal...
・In the case of urethane, when hookahvinylidene powder is applied to the tip of the blade, it is ○, but when it is not applied, it is reversed, so tests for photoreceptor scratches, cleanability, and oil oozing are based on the data when applied. be. 3) Photoconductor scratches: If there is a black line in the solid white area in the photoconductor drum circumferential direction when surface printing is done at an appropriate density using the Canon Family Copier FC-5 (trade name) used in this experiment, there is a photoconductor scratch. If there is no damage to the photoconductor 4) Cleanability... If a black line occurs in the circumferential direction of the photoconductor using the same image forming method as in 3) and there is toner on the photoconductor after cleaning = poor cleaning performance If there is no black line = good cleaning performance 5) Oil seeping out... If a longitudinal black line appears at the cleaning blade pressure contact position on the photoreceptor using the same image forming method as in 3) - Oil seeping out. If no seepage occurs = no oil seepage 6) Compression set...Displayed as 6301) in JIS standard. [0043] As is clear from the above results, the cleaning blade of the present invention has no reversal during initial sliding compared to any of the cleaning members from Examples 1 to 5, exhibits good leaning properties, and has good oil resistance. It was proven that there was no seepage. [0044] On the other hand, the cleaning blade of Comparative Example 1 causes inversion if vinylidene fluoride fine powder is not present, and if it is added, it damages the photoreceptor, resulting in a shortened lifespan. Further, in Comparative Example 2, the particle size of the filler added was large, which caused damage to the photoreceptor and poor cleaning performance, resulting in poor images. Comparative Example 3 is a commercially available liquid silicone material, and the edge roughness after edge processing of the cleaning blade ranges from several microns to over 10 microns, and there are problems with scratches on the photoreceptor and cleaning performance, and the oil content is high. There was also the problem of oil seeping out. Comparative Example 4 is the same rubber as Comparative Example 3 that is not subjected to secondary vulcanization, and due to its large compression set, cleaning failure occurs after about 200 to 300 sheets, and the oil content is high, so it is difficult to prevent oil seepage. There were also problems. [0045]

【Effect of the invention】

It is possible to prevent reversal during initial sliding, prolong the life of the cleaning blade without the problem of scratching the image bearing member such as the photoreceptor, and produce a cleaning blade with excellent productivity and quality.
This provides an excellent cleaning effect.

[Brief explanation of drawings]

[Figure 1] FIG. 3 is an explanatory diagram showing a reversal phenomenon of a cleaning blade.

FIG. 2 is an enlarged view of a sliding portion between a cleaning blade and a photoreceptor drum.

FIG. 3 is a schematic configuration diagram of a general transfer type electrophotographic apparatus to which a cleaning blade according to the present invention is applied.

FIG. 4 is a block diagram of a facsimile machine that uses an electrophotographic apparatus as a printer to which a cleaning blade according to the present invention is applied.

FIG. 5 is an explanatory diagram showing the state of wear of the cleaning blade after durability.

【Document name】

drawing

[Figure 1]

[Figure 2]

[Figure 3]

[Figure 4]

[Figure 5]

Claims (9)

[Claims] 1. A cleaning blade used in a cleaning device for cleaning and removing toner powder remaining on the surface of an image carrier, the material of which is silicone rubber, and a low viscosity organosiloxane component contained in the silicone rubber. 5% by weight or less, a rubber hardness of 40 to 90 degrees according to JISA, and a compression set of 20% or less. 2. The cleaning blade according to claim 1, wherein the silicone rubber of the cleaning blade contains a filler having a particle size of 1 μm or less. 3. The cleaning blade according to claim 2, wherein the filler contained in the silicone rubber of the cleaning blade is silica. 4. The cleaning blade according to claim 3, wherein the silica is hydrophobic treated silica. 5. The cleaning device according to claim 1, wherein the support member for holding the cleaning blade is disposed in a mold for molding the cleaning blade, and the cleaning blade and the support member are integrally molded during rubber injection molding. blade. 6. The cleaning blade according to claim 1, wherein the cleaning blade is made of additive-type liquid silicone rubber. 7. An apparatus unit in which at least one of the charging means and the developing means is integrally supported together with the photoreceptor and the cleaning blade to form a single unit that can be freely attached to and detached from the apparatus main body. The material is silicone rubber, the low-viscosity organosiloxane component contained in the silicone rubber is 5% by weight or less, the rubber hardness is 40 to 90 degrees according to JISA, and the compression set is 20% or less. equipment unit. 8. An electrophotographic apparatus comprising a photoreceptor, a latent image forming means, a means for developing the formed latent image, a means for transferring the developed image onto a transfer material, and a cleaning blade,
The material of the cleaning blade is silicone rubber, the low-viscosity organosiloxane component contained in the silicone rubber is 5% by weight or less, and the rubber hardness is 4 according to JISA.
An electrophotographic device characterized by having a compression set of 20% or less at 0 to 90 degrees. 9. A photoreceptor, a latent image forming means, a means for developing the formed latent image, a means for transferring the developed image to a transfer material, and a material made of silicone rubber, which has a low viscosity contained in the silicone rubber. An electrophotographic device equipped with a cleaning blade having an organosiloxane component of 5% by weight or less, a JISA rubber hardness of 40 to 90 degrees, and a compression set of 20% or less, and a receiving means for receiving image information from a remote terminal. A facsimile machine characterized by having.