WO2009121283A1

WO2009121283A1 - A conductive cleaning drawing template and a laser imaging device

Info

Publication number: WO2009121283A1
Application number: PCT/CN2009/071039
Authority: WO
Inventors: 周小平
Original assignee: 兰光明
Priority date: 2008-04-03
Filing date: 2009-03-27
Publication date: 2009-10-08
Also published as: CN101261488A

Abstract

There is provided a conductive cleaning drawing template (8a) comprising a metal dead knife (81) and a blade (82). The blade (82) is made of conductive polyurethane which is a conductive composition of ion conductive donor and polyurethane formed by crosslinking unsaturated polyol and one or more types of polyisocryanate. In addition, there is also provided a laser imaging device with the conductive cleaning drawing template (8a), which combines the charging roller (5) and the cleaning scraper (8) in the prior art, so as to avoid the trouble of producing the charging roller, and thus reduce pollution and cost.

Description

Conductive cleaning blade and laser imaging device

[Technical Field]

The present invention relates to the field of laser image forming technology, and in particular to a toner cartridge cleaning blade of a laser printer, a laser facsimile machine, a laser copier, a laser photographer, and the like, and a laser image forming apparatus including the same.

【Background technique】

The working principle of laser imaging is to first convert the printed signal from the computer into a pulse signal and send it to the laser. The charging roller uniformly charges the surface of the photosensitive drum core. The laser emits laser light to cancel the charge on the image part of the drum core, and then the magnetic roller is placed on the magnetic roller. The toner is adsorbed onto the drum core by electrostatic principle and then transferred by the transfer roller. Since the voltage on the transfer roller is higher than the voltage on the drum core, the toner on the drum core is pulled onto the paper. After warming and pressing, the carbon powder is melted and penetrated into the fibers of the paper to complete the entire imaging process. The molding structure is as shown in FIG. 1, and includes a powder feeder 2, a developing roller 3, a powder discharging knife 4, a photosensitive drum core 7, a charging roller 5, a cleaning blade 8, and the like. After one image is completed, the cleaning blade 8 must have a photosensitive drum The residual toner left over from the pattern on the core 7 is scraped off and stored in the waste toner box. Then, the charging roller 5 charges the surface of the photosensitive drum core 7 again, and removes the residual potential after imaging once, and then performs the second image operation. At present, the structure of the existing charging roller 5 comprises a roller core made of a metal conductive material, the roller core is coated with a conductive adhesive layer, and the conductive adhesive layer is provided with a conductive rubber having a certain thickness and containing carbon micropowder. The rubber elastic layer, the outer surface of the conductive rubber elastic layer is covered with a conductive coating. In the above manufacturing, the charging roller is relatively complicated in process and seriously pollutes the environment. At the same time, the conductive coating of the charging roller is damaged or unclean and the operation process The consumption of the medium voltage causes the photosensitive drum to be charged and discharged insufficiently, causing the bottom ash or affecting the print quality. The cleaning blade is generally formed by bonding a transparent polyurethane sheet to a metal sheet material. The polyurethane material mainly has high abrasion resistance and does not damage the photosensitive drum. The cleaning blade does not have electrical conductivity because its polyurethane material is an insulating material.

[Summary of the Invention]

The technical problem to be solved by the present invention is to overcome the above drawbacks of the prior art, and provide an electrically conductive cleaning blade which can replace the existing charging roller and the cleaning blade, and can clean the photosensitive drum core and the surface of the photosensitive drum core. Charging to reduce manufacturing costs.

The present invention also provides a laser imaging apparatus including the above-described cleaning blade.

In order to achieve the above object, the present invention proposes the following technical solutions:

An electrically conductive cleaning blade, which is composed of a metal bottom knife and a blade, and is characterized in that: the blade is made of a conductive polyurethane material, and the polyurethane material is an unsaturated polyol and one or more The isocyanate is a polyurethane conductive composition produced by crosslinking reaction to form a polyurethane resin and then mixing with an ion conductive type donor.

Preferably, the polyurethane resin formed by crosslinking the polyol with one or more polyisocyanates is mixed with an ion conductive type donor in a ratio of 100: 5 to 20.

Preferably, the polyurethane conductive composition has a resistivity of 10 ^{5 to} 10 ⁹ ohms/cm. Preferably, the polyol is a polyether polyol, a polyoxypropylene ether polyol, a polytetrahydrofuran polyol, a polycaprolactone polyol or a polyester polyol.

Preferably, the polyisocyanate is one or more of a high molecular polymer MDI, toluene diisocyanate IDI, hexamethylene diisocyanate HDI, and a modified mixture thereof.

Preferably, the ion conductive type administering agent is: metal anion, cationic conductive material, non-detached Sub-conductive material.

The present invention also provides a laser image forming apparatus comprising a powder silo, a powder feeding roller, a developing roller, a transfer roller and a photosensitive drum core, wherein: a photosensitive drum core is disposed at a position in front of the photosensitive drum core An electrically conductive cleaning blade that is in contact with the outer surface, the electrically conductive cleaning blade being composed of a metal base knife and a blade made of a conductive polyurethane material, the polyurethane material being an unsaturated polyol and one or one The above polyisocyanate is subjected to a crosslinking reaction to form a polyurethane resin, and then a polyurethane conductive composition prepared by mixing with an ion conductive type donor.

Preferably, the polyol is crosslinked with one or more polyisocyanates to form a polyurethane resin and an ion conductive type donor in a mixing ratio of 100: 5 to 20.

Preferably, the polyurethane conductive composition has a resistivity of from 10 ^{5 to} 10 ⁹ ohms/cm. Preferably, the polyol is a polyether polyol, a polyoxypropylene ether polyol, a polytetrahydrofuran polyol, a polycaprolactone polyol or a polyester polyol.

Preferably, the ion conductive type administering agent is: a metal anion, a cationic conductive material, and a nonionic conductive material. It can be seen from the above technical solution that the present invention can combine the charging roller and the cleaning blade of the prior art by using an electrically conductive cleaning blade, which can save the trouble of manufacturing the charging roller, reduce pollution, and save. The material, calculated by the number of toner cartridges used in the world every year, can save the material cost and processing cost of 250 million charging rollers, which can be reduced by 3,250 tons per year based on an average of 130 grams per charging roller. Solid waste, saving 3.75 billion yuan, and this number is increasing by 15% every year. [Description of the Drawings]

Figure 1 is a schematic view showing the structure of a cleaning blade of the present invention;

2 is a schematic structural view of a prior art laser imaging device;

3 is a schematic structural view of a laser imaging apparatus of the present invention.

In the picture:

1 a powder bin; 2 - powder feeding roller;

3—developing roller; 4 a powder knife;

5—charging roller; 6—shadow roller;

7—photosensitive drum core; 8—cleaning scraper:

8a—cleaning scraper; 81—bottom knife;

82—blade.

【detailed description】

The present invention first provides an electrically conductive cleaning blade. As shown in FIG. 3, the conductive cleaning blade 8a is composed of a metal base knife 81 and a blade 82. The blade 82 of the present invention is made of a conductive polyurethane material, and the polyurethane material is unsaturation. A polyurethane conductive composition prepared by mixing a polyol with one or more polyisocyanates to form a polyurethane resin and then mixing with an ion conductive type donor. The volume resistivity of the polyurethane squeegee having a thickness of from 1.0 to 1.00 Å is from 10 ^{5 to} 10 ⁹ ohm.cm. By connecting the cleaning blade 8 to the power source, when the power is turned on, the photosensitive drum core can be charged as a conductor, and the residual potential after imaging can be cleared to achieve the effect of acting as a charging roller; Residual toner that can be used as an insulator to leave a pattern on the photosensitive drum Scrape off to achieve the function of cleaning the scraper. In this way, the charging roller and the cleaning blade of the prior art can be combined into one, which can save the trouble of manufacturing the charging roller, thereby reducing pollution and saving material cost.

In the present invention, the polyol used includes a polymer polyol such as a polyether polyol, a polyoxypropylene ether polyol, a polytetrahydrofuran polyol, a polycaprolactone polyol, a polyester polyol, etc.; the polyisocyanate is a polymer One or more of the polymer MDI, toluene diisocyanate IDI, hexamethylene diisocyanate HDI and a modified mixture thereof, the molar ratio of the NC0 to the hydroxyl group 0H of the polyol and the polyisocyanate is in the range of 0. Between 9 and 2. 0.

The polyurethane resin formed by crosslinking the polyol with one or more polyisocyanates is mixed with an ion conductive type donor in a ratio of 100: 5 to 20.

The ion conductive type injecting agent may be a metal anion or a cationic conductive material, and a nonionic conductive material, wherein the metal anion conductive material may be selected from the group consisting of a mercaptosulfonate, a sulfate, a phosphoric acid derivative, a higher fatty acid salt, a carboxylate, etc. Metal cation conductive materials are selected from amine salts, quaternary ammonium salts, sulfonium amino acid salts, etc. Non-ionic conductive materials are selected from polyethylene glycol esters or ethers, polyol fatty acid esters, fatty acid sterol amides, fatty amine ethoxylated ethers. Wait.

The present invention also provides a laser image forming apparatus comprising the above cleaning blade. As shown in FIG. 2, the present invention comprises: a container for accommodating toner, a powder hopper 1, a powder feeding roller 2 placed in the powder hopper 1, and a developing roller 3, and the outer surface of the developing roller 3 is provided with a touch The powder discharging knives 4 are provided, before the developing roller 3, a photosensitive drum core 7 tangential thereto is provided, and the photosensitive drum core 7 is simultaneously tangential to the transfer roller 6, in front of the photosensitive drum core 7 The position is provided with an electrically conductive cleaning blade 8a. The cleaning blade 8a can be in contact with the outer surface of the photosensitive drum core 7. After charging, it can replace the charging roller of the prior art as a conductor to the surface of the photosensitive drum core 7. Charging, thereby scraping off residual toner left over from the pattern on the photosensitive drum core 7. The conductive cleaning blade 8a is made of a conductive polyurethane material which is an unsaturated polyol and a polyisocyanate and an ion conductive type. The agent is mixed to form a polyurethane conductive composition having a resistivity of 10 ^{3 to} 10 ⁹ ohm.cm.

The cleaning blade 8a made of the above-mentioned conductive polyurethane material can save the processing material and reduce the material cost because the charging roller can be omitted, and at the same time, the cumbersome process and environmental pollution in the processing can be avoided by using the charging roller. There is no problem that the voltage consumption during operation due to breakage or uncleanness of the conductive coating of the charging roller may cause the bottom of the photosensitive drum to be insufficiently charged or discharged, which may affect the print quality.

The above-mentioned embodiments are merely illustrative of one embodiment of the present invention, and the description thereof is more specific and detailed, but is not to be construed as limiting the scope of the invention. It should be noted that a number of variations and modifications may be made by those skilled in the art without departing from the spirit and scope of the invention. Therefore, the scope of the invention should be determined by the appended claims.

Claims

Claim

1. An electrically conductive cleaning blade, which is composed of a metal base knife and a blade, wherein: the blade is made of a conductive polyurethane material, the polyurethane material is an unsaturated polyol and one or a kind The above polyisocyanate is produced by a crosslinking reaction to form a polyurethane resin, and then mixed with an ion conductive type donor to prepare a polyurethane conductive composition.

2. The conductive cleaning blade according to claim 1, wherein: the polyurethane resin formed by crosslinking the polyol with one or more polyisocyanates is mixed with an ion conductive type donor. : 5~20.

3. The conductive cleaning blade according to claim 1, wherein: the polyurethane conductive composition has a resistivity of 10 ^{5 to} 10 ⁹ ohms/cm.

The conductive cleaning blade according to any one of claims 1 to 3, wherein the polyhydric alcohol is a polyether polyol, a polyoxypropylene ether polyol, a polytetrahydrofuran polyol, or a poly Ester polyol or polyester polyol.

The conductive cleaning blade according to any one of claims 1 to 3, wherein the polyisocyanate is a polymer MDI, toluene diisocyanate IDI, hexamethylene diisocyanate HDI, and the like. One or more of the sexual mixtures.

The conductive cleaning blade according to any one of claims 1 to 3, wherein the ion conductive type donor is: a metal anion, a cationic conductive material, and a nonionic conductive material.

7. A laser image forming apparatus comprising: a powder silo, a powder feeding roller, a developing roller, a transfer roller and a photosensitive drum core, wherein: a position in front of the photosensitive drum core is provided to be in contact with an outer surface of the photosensitive drum core An electrically conductive cleaning blade is formed, the conductive cleaning blade being composed of a metal base knife and a blade made of a conductive polyurethane material, the polyurethane material being an unsaturated polyol and one or more polyisocyanates Producing a cross-linking reaction to form a polyurethane resin and then giving it with an ion-conducting type A polyurethane conductive composition prepared by mixing the prepolymers.

8. The laser image forming apparatus according to claim ,, wherein: the polyol is crosslinked with one or more polyisocyanates to form a polyurethane resin and an ion conductive type donor, and the mixing ratio is 100: 5~ 20.

9. The laser image forming apparatus according to claim 1, wherein the polyurethane conductive composition has a resistivity of from 10 ^{5 to} 10 ⁹ ohms/cm.

The laser image forming apparatus according to any one of claims 7 to 9, wherein the polyhydric alcohol is a polyether polyol, a polyoxypropylene ether polyol, a polytetrahydrofuran polyol, or a polycaprolactone polyol. Alcohol or polyester polyol.

The laser image forming apparatus according to any one of claims 7 to 9, wherein the polyisocyanate is a polymer MDI, toluene diisocyanate IDI, hexamethylene diisocyanate HDI, and a modified mixture thereof. One or more of them.

The conductive cleaning blade according to any one of claims 7 to 9, wherein the ion conductive type donor is: a metal anion, a cationic conductive material, and a nonionic conductive material.