Cleaning scraper of multi-layer conductive structure

Abstract

The utility model discloses a cleaning scraper with a multilayer conductive structure. The cleaning scraper with the multilayer conductive structure is used for cleaning and charging a photosensitive drum and comprises a scraper rest and a blade, the blade is made of an electronic conductive material and a polyurethane polymer material, is arranged on the scraper rest and abuts against the photosensitive drum, the blade is provided with at least two conductive layers, and the at least two conductive layers comprise a first conductive layer abutting against the photosensitive drum and a second conductive layer abutting against the photosensitive drum. The second conductive layer is laminated at the bottom of the first conductive layer; the resistivity of the first conductive layer is less than the resistivity of the second conductive layer. The conductive cleaning scraper is made of electronic conductive materials and polyurethane high polymer materials, the blade is prepared in a layered stacking mode, multiple conductive layers with different resistivity are obtained, the conductive layers form a uniform electric field, and therefore the conductive cleaning scraper has stable conductive performance.

Description

Technical Field

[0001] The utility model relates to the technical field of processing boxes, in particular to a cleaning scraper with a multi-layer conductive structure. Background Art

[0002] In the existing processing box, a conductive cleaning scraper is often used instead of a charging roller to charge the photosensitive drum. The conductive cleaning scraper generally uses polyurethane as a base material, and an ionic conductive agent is added therein to make the polyurethane material conductive. However, since the ionic conductive agent is a supersaturated solution, the characteristics of the supersaturated solution can easily cause the supersaturated solution to be unevenly distributed in the polyurethane material, resulting in differences in the structure of the cleaning scraper made of the ionic conductive agent and polyurethane, and the disadvantage that current accumulation forms a local high voltage that breaks down the photosensitive drum. Therefore, the prior art wraps a layer of copper foil on the cleaning scraper made of the ionic conductive agent and polyurethane to make the conductive cleaning scraper have a uniform electric field. However, during long-term use, it will easily detach, resulting in a short service life of the conductive cleaning scraper. Utility Model Content

[0003] In order to solve the technical problems existing in the prior art, the purpose of the utility model is to provide a cleaning scraper with a multi-layer conductive structure to solve the above-mentioned technical problems.

[0004] A cleaning scraper with a multi-layer conductive structure, used for cleaning and charging a photosensitive drum, comprising:

[0005] Knife holder;

[0006] A blade is arranged on a blade holder and abuts against a photosensitive drum, wherein the blade is provided with at least two conductive layers, wherein the at least two conductive layers include a first conductive layer abutting against the photosensitive drum, and a second conductive layer stacked on the first conductive layer;

[0007] The resistivity of the first conductive layer is lower than the resistivity of the second conductive layer.

[0008] The cleaning scraper with the above structure is made of electronic conductive material and polyurethane polymer material, and the blade is prepared by a layered stacking method to obtain multiple conductive layers with different resistivities. The conductive layers form a uniform electric field, so that the conductive cleaning scraper has stable conductive properties.

[0009] Preferably, the blade comprises a third conductive layer, which is stacked on the second conductive layer and is away from the first conductive layer;

[0010] The resistivity of the third conductive layer is lower than that of the second conductive layer.

[0011] Preferably, the resistivity of the third conductive layer is smaller than that of the first conductive layer.

[0012] Preferably, the blade is prepared in a layered molding manner.

[0013] Preferably, the blade holder is provided with a mounting portion, and the blade is fixed on the mounting portion.

[0014] Preferably, the mounting portion is provided with an abutment strip, and the side edge of the blade abuts against the abutment strip.

[0015] Preferably, the blade is made of electronically conductive material and polyurethane polymer material.

[0016] Preferably, the electronically conductive material is a carbon black powder material.

[0017] Preferably, the blade holder and the blade are connected and fixed by conductive glue.

[0018] Beneficial effects of the utility model:

[0019] The blade of the utility model is made of electronic conductive material and polyurethane polymer material. The blade is provided with at least two conductive layers, including a first conductive layer abutting against the photosensitive drum, and a second conductive layer stacked on the bottom of the first conductive layer; the resistivity of the first conductive layer is less than the resistivity of the second conductive layer. The conductive layer with low resistivity in the blade can form a uniform electric field, and there is no need to add copper foil to form a uniform electric field as in the prior art, which solves the problem that the copper foil is troublesome to install and easy to fall off, and also avoids the risk of copper foil detachment during the printing process. Secondly, the multiple conductive layers in the blade are integrally formed and isolated from the air, so the conductive performance of the blade is less affected by the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0021] Figure 1 This is a cross-sectional view of a cleaning scraper with a multi-layer conductive structure installed in a processing box according to the utility model;

[0022] Figure 2 This is a three-dimensional structural diagram of a cleaning scraper with a multi-layer conductive structure installed in a processing box according to the utility model;

[0023] Figure 3 A three-dimensional structural diagram of a cleaning scraper having a multi-layer conductive structure according to Embodiment 1;

[0024] Figure 4 for Figure 2 The illustrated embodiment 1 is a side view of a cleaning blade having a multi-layer conductive structure;

[0025] Figure 5 A three-dimensional structural diagram of a cleaning scraper with a multi-layer conductive structure according to the second embodiment;

[0026] Figure 6 for Figure 5 The second embodiment is a side view of a cleaning blade with a multi-layer conductive structure.

[0027] Wherein: 1, blade; 11, first conductive layer; 12, second conductive layer; 13, third conductive layer;

[0028] 2. tool holder; 21. mounting portion; 22. abutment strip;

[0029] 3. Processing box; 31. Developing frame; 32. Photosensitive frame; 33. Powder bin; 331. Stirring frame; 332. Feed roller; 333. Developing roller; 34. Waste powder bin; 341. Photosensitive drum. DETAILED DESCRIPTION

[0030] In order to better understand the technical solution of the present utility model, the embodiments of the present utility model are described in detail below with reference to the accompanying drawings.

[0031] It should be clear that the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0032] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0033] like Figure 1 As shown, the processing box 3 is used to perform a developing task in the printing device. The processing box 3 can be detachably mounted on the printing device, and the processing box 3 stores a developing medium for printing. When the printing device performs a developing task, the developing medium in the processing box 3 will be displayed on the recording medium.

[0034] The processing box 3 includes a developing frame 31 and a photosensitive frame 32, wherein the developing frame 31 encloses a powder bin 33 for storing toner, and a stirring frame 331, a feeding roller 332 and a developing roller 333 are arranged inside the developing frame 31. The developing frame 31 is roughly in the shape of a long box, and the developing frame 31 has end faces at both ends in the length direction. A powder adding port can be provided on the developing frame 31, and toner is added to the powder bin 33 through the powder adding port. The powder adding port can be opened on one of the end faces of the developing frame 31. The stirring frame 331, the feeding roller 332 and the developing roller 333 are rotatably supported at both ends in the length direction of the developing frame 31, and the axial directions of the stirring frame 331, the feeding roller 332 and the developing roller 333 are all along the length direction of the developing frame 31. The toner in the powder bin 33 is stirred by the stirring frame 331 to prevent the toner in the powder bin 33 from agglomerating. At the same time, the toner can be transported toward the feeding roller 332 and then transported to the developing roller 333 by the feeding roller 332 so that the toner is adsorbed by the charged developing roller 333.

[0035] The photosensitive frame 32 is surrounded by a waste toner bin 34 for collecting waste toner, and a photosensitive drum 341 and a cleaning scraper are arranged inside the waste toner bin 34. The photosensitive frame 32 also has a length direction, and its length direction is consistent with the length direction of the developing frame 31. The photosensitive drum 341 is rotatably supported at both ends of the photosensitive frame 32 in the length direction, and the axial direction of the photosensitive drum 341 is consistent with the length direction of the photosensitive frame 32. The waste toner bin 34 is arranged along the length direction of the photosensitive frame 32, and the waste toner bin 34 is located on one side of the photosensitive drum 341. The toner adsorbed by the developing roller 333 is transferred to the photosensitive drum 341 through the potential difference between the developing roller 333 and the photosensitive drum 341. After the transfer, the cleaning scraper is in linear contact with the photosensitive drum 341 to clean the toner that has not been completely transferred on the surface of the photosensitive drum 341, that is, the waste toner. The cleaned waste toner is stored in the waste toner bin 34. At the same time, the blade of the cleaning scraper is provided with a multi-layer conductive structure, which can charge the surface of the photosensitive drum 341 with a uniform charge, so that the photosensitive drum 341 can absorb the toner.

[0036] Embodiment 1

[0037] like Figure 1-3 As shown, a cleaning scraper with a multi-layer conductive structure includes a blade 1 and a blade holder 2, which is arranged inside a processing box 3 and is used to clean and charge a photosensitive drum 341 in the processing box 3. The blade 1 is made of an electronic conductive material and a polyurethane polymer material, and also solves the problem of high manufacturing cost caused by ionic conductive agents. Specifically, one side of the blade 1 is mounted on the blade holder 2, and the other side of the blade 1 abuts against the photosensitive drum 341. The cross-section of the blade holder 2 is roughly L-shaped and is made of metal material. Preferably, the technical solution uses a steel sheet, and its length is the same as that of the photosensitive drum 341. The blade 1 is roughly rectangular, and preferably, its length is also the same as that of the photosensitive drum 341. The blade 1 has conductive properties and can be charged synchronously when cleaning the surface of the photosensitive drum 341.

[0038] like Figure 4 As shown, the blade 1 is made of three conductive layers stacked together, including a first conductive layer 11 abutting against the photosensitive drum 341, a second conductive layer 12 stacked at the bottom of the first conductive layer 11, and a third conductive layer 13 stacked at the bottom of the second conductive layer 12. Specifically, in this embodiment, the resistivity of the first conductive layer 11 is smaller than that of the second conductive layer 12, the resistivity of the third conductive layer 13 is smaller than that of the second conductive layer 12, and the resistivity of the third conductive layer 13 is smaller than that of the first conductive layer 11.

[0039] The blade 1 is prepared by a centrifuge in a layered molding manner. Specifically, the blade 1 is prepared by a centrifuge using materials such as polyurethane, electronic conductive material, and curing agent. The electronic conductive material can be carbon black powder, graphite powder, etc., preferably carbon black powder. Since the first conductive layer 11, the second conductive layer 12, and the third conductive layer 13 are prepared by uniformly stirring polyurethane, electronic conductive material, and curing agent, the blade 1 has a uniform charge transfer layer, thereby making the conductive cleaning scraper have stable conductive properties. In addition, during the preparation process, the resistivity of the blade 1 is controlled by controlling the thickness of the conductive layer, which makes it easier to control the resistance than the ionic conduction method, and the product is more stable.

[0040] Preparation method of blade 1: After polyurethane is mixed with curing agent and carbon black powder of different concentrations, it is added into a centrifuge for molding three times. For the first time, polyurethane containing high concentration of carbon black powder is poured into the centrifuge for curing reaction. After the initial curing is completed, the first conductive layer 11 is formed in the centrifuge. For the second time, polyurethane containing low concentration of carbon black powder is added to complete the second curing reaction to form the second conductive layer 12 in the centrifuge. For the third time, polyurethane containing high concentration of carbon black powder is added to complete the third curing reaction to form the third conductive layer 13 in the centrifuge, and finally a blade 1 with a three-layer structure is obtained. The resistivity of the conductive layer can be adjusted by the concentration of the mixed carbon black powder and the molding thickness of the conductive layer.

[0041] like Figure 4 As shown, the blade holder 2 is provided with a mounting portion 21. Specifically, in this embodiment, the mounting portion 21 is provided at the long side of the L-shaped cross section of the blade holder 2, formed by bending one end of the long side, and the blade 1 is connected and fixed on the mounting portion 21 by conductive glue.

[0042] Embodiment 2

[0043] like Figure 5 and Figure 6As shown, the difference from the first embodiment is that the structure of the blade 1 is made of two conductive layers stacked together, including a first conductive layer 11 abutting against the photosensitive drum 341, and a second conductive layer 12 stacked at the bottom of the first conductive layer 11. Specifically, in this embodiment, the resistivity of the first conductive layer 11 is less than the resistivity of the second conductive layer 12.

[0044] like Figure 6 As shown, the blade holder 2 is provided with a mounting portion 21, and the mounting portion 21 is provided with an abutment strip 22. Specifically, in this embodiment, the mounting portion 21 is provided at the long side of the L-shaped cross section of the blade holder 2, and is formed by bending one end of the long side, and the blade 1 is connected and fixed to the mounting portion 21 by conductive glue; the side of the blade 1 is closely against the abutment strip 22, and the abutment strip 22 is roughly in the shape of a long strip, and its length is the same as that of the blade 1. When the blade 1 is installed on the mounting portion 21, the side of the blade 1 in the length direction abuts against the abutment strip 22, so that the blade 1 can be more stably installed on the mounting portion 21, and the abutment strip 22 has conductive properties, which can improve the conductive properties of the blade 1.

[0045] The working principle of the utility model is as follows: when the cleaning scraper is performing cleaning work, when a voltage is applied to the blade 1, since the blade 1 is a multi-layer conductive layer prepared by evenly stirring polyurethane, electronic conductive material, and curing agent, and the resistivity between the conductive layers is different, a uniform charge transfer layer is formed, and a uniform charge layer is formed on the first conductive layer 11 due to the electronic characteristics. Afterwards, since the first conductive layer 11 of the blade 1 is in contact with the photosensitive drum 341, a uniform charge layer is formed on the photosensitive drum 341 through the conductivity of the first conductive layer 11, thereby completing the charging work.

[0046] The above are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the inventive concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A cleaning blade with a multi-layer conductive structure, used for cleaning and charging a photosensitive drum, characterized in that: include: Knife holder; a blade, arranged on the blade holder and abutting against the photosensitive drum, the blade comprising a first conductive layer abutting against the photosensitive drum, and a second conductive layer stacked on the first conductive layer; The resistivity of the first conductive layer is lower than the resistivity of the second conductive layer.

2. A cleaning blade with a multi-layer conductive structure according to claim 1, characterized in that: The blade further comprises a third conductive layer, the third conductive layer being stacked on the second conductive layer and away from the first conductive layer; The resistivity of the third conductive layer is lower than that of the second conductive layer.

3. A cleaning blade with a multi-layer conductive structure according to claim 2, characterized in that: The resistivity of the third conductive layer is lower than that of the first conductive layer.

4. The cleaning blade of the multi-layer conductive structure according to claim 1, characterized in that: The blade is prepared in a layered molding manner.

5. The cleaning blade with a multi-layer conductive structure according to claim 1, characterized in that: The blade holder is provided with a mounting portion, and the blade is fixed on the mounting portion.

6. The cleaning blade with a multi-layer conductive structure according to claim 5, characterized in that: The mounting portion is provided with an abutment strip, and the side edge of the blade abuts against the abutment strip.

7. A cleaning blade with a multi-layer conductive structure according to any one of claims 1 to 6, characterized in that: The blade is made of electronic conductive material and polyurethane polymer material.

8. The cleaning blade with a multi-layer conductive structure according to claim 7, characterized in that: The electronic conductive material is carbon black powder material.

9. A cleaning blade with a multi-layer conductive structure according to any one of claims 1 to 6, characterized in that: The blade holder and the blade are connected and fixed by conductive glue.

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