Processing box

Abstract

The invention relates to a process cartridge, which comprises a developing unit and a photosensitive unit, the photosensitive unit comprises a photosensitive shell and a photosensitive drum rotatably mounted on the photosensitive shell, the photosensitive drum comprises a roll shaft and a roller mounted on the roll shaft, and the surface of the roller is provided with a photosensitive coating. The processing box further comprises a conductive part and a separation shifting block, the conductive part enables the roller and the roller shaft to be electrically connected, the separation shifting block can move from a first position to a second position to shift the conductive part, and the conductive part makes contact with the roller at the first position so that the roller can be electrically connected with the roller shaft; and at the second position, the conductive part is separated from the roller so as to cut off the electric connection between the roller and the roller shaft. According to the processing box, the roller and the roll shaft of the photosensitive drum are electrically connected through the conductive part, and the conductive part is moved through the separation shifting block to separate the conductive part from the roller, so that the electric connection between the roller and the roll shaft is cut off, and the processing box can be in a working stop state under the condition that the photosensitive unit is not moved.

Description

Technical Field

[0001] The present invention relates to a process box, and in particular to a process box that can be detachably mounted to a laser imaging device. Background Art

[0002] The process cartridge is an indispensable printing consumable in laser imaging equipment. The process cartridge includes a developing unit and a photosensitive unit. The developing unit has a developing roller, and the photosensitive unit has a photosensitive drum and a charging roller. The photosensitive drum includes a roller shaft and a roller. The roller is made of a metal conductive material, generally an aluminum roller, and the surface of the roller has a photosensitive coating. The roller is fixedly mounted on the roller shaft, rotates with the roller shaft, and can be electrically connected to the roller shaft to conduct the charge on the roller to the imaging device.

[0003] When the processing box is working, the developer is first adsorbed on the surface of the developer roller through the action of electric charge. The developer attached to the surface of the developer roller is negatively charged. The photosensitive coating of the photosensitive drum given by the charging roller is also negatively charged. Since the developer on the surface of the developer roller and the photosensitive coating on the surface of the photosensitive drum have the same charge polarity and repel each other, the developer on the surface of the developer roller cannot be transferred to the surface of the photosensitive drum. The laser irradiates the photosensitive coating of the photosensitive drum, and the irradiated part of the photosensitive coating becomes a conductor. The charge on the surface of the photosensitive coating is transmitted to the roller, and then transmitted to the imaging device through the roller and the roller shaft. The surface of the photosensitive coating that is not irradiated is still negatively charged, which forms the so-called electrostatic latent image. The developer with negative charge on the surface of the developer roller is adsorbed to the position of the electrostatic latent image on the surface of the photosensitive drum. The developer on the surface of the photosensitive drum is then transferred to the surface of the paper under the action of the transfer roller, and the laser printing is completed after the fixing process.

[0004] The color laser imaging device is equipped with four processing boxes, each of which contains four colors (cyan, magenta, yellow, and black) of developer. When the imaging device is in color mode, the four processing boxes work simultaneously. In black printing mode, only the processing box containing black developer works, and the other processing boxes do not work. For the convenience of description below, the processing boxes containing cyan, magenta, and yellow developers are referred to as color processing boxes, and the processing box containing black developer is referred to as black processing box.

[0005] Chinese patent CN104583879A discloses an imaging device and a processing box, wherein the imaging device is equipped with four color processing boxes. In the black-and-white printing mode, the separation member in the imaging device moves the photosensitive unit by pushing the housing of the photosensitive unit, thereby separating the photosensitive drum and the developing roller by a certain distance, so that the developer on the developing roller cannot be transferred to the surface of the photosensitive drum under the action of the charge, thereby stopping the color processing box from working.

[0006] Imaging devices and processing boxes are both precision-structured components. Frequent movement of the photosensitive unit will affect the matching accuracy between the components, which in turn can easily affect the printing quality. Summary of the invention

[0007] An object of the present invention is to provide a processing box which can stop the operation of the processing box without moving the photosensitive unit.

[0008] In order to achieve the above-mentioned purpose, the processing box of the present invention comprises a developing unit and a photosensitive unit, wherein the developing unit comprises a developing housing and a developing roller rotatably mounted on the developing housing, and the photosensitive unit comprises a photosensitive housing and a photosensitive drum rotatably mounted on the photosensitive housing, wherein the photosensitive drum comprises a roller shaft and a roller mounted on the roller shaft, and the surface of the roller has a photosensitive coating. The processing box of the present invention further comprises a conductive member and a separation block, wherein the conductive member electrically connects the roller and the roller shaft, and the separation block can be moved from a first position to a second position to move the conductive member, wherein in the first position, the conductive member contacts the roller so that the roller and the roller shaft are electrically connected; and in the second position, the conductive member separates from the roller so that the electrical connection between the roller and the roller shaft is cut off.

[0009] The processing box of the present invention electrically connects the roller and the roller shaft of the photosensitive drum through a conductive member, and moves the conductive member through a separation block to separate the conductive member from the roller, thereby cutting off the electrical connection between the roller and the roller shaft. In this way, the processing box can be put into a stopped working state without moving the photosensitive unit.

[0010] In one embodiment, the separation block is rotatably mounted on one end of the process box, and the separation block can be rotated from a first position to a second position. The rotational movement of the separation block is easy to achieve and saves structural space.

[0011] In one embodiment, the separation block includes a separation protrusion, and when the separation protrusion moves, it can force the conductive member to separate from the roller.

[0012] In one embodiment, the process cartridge includes a bracket that can be detachably mounted to an end of the developer housing.

[0013] In one embodiment, the separation block is mounted on the bracket.

[0014] In one embodiment, the conductive member includes a first end and a second end, the first end can be electrically connected to the roller shaft, and the second end can be electrically contacted with the roller.

[0015] In one embodiment, the conductive member is a torsion spring, which can automatically return to an initial position, thereby facilitating automatic resetting. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a perspective view of a process cartridge of the present invention according to one embodiment.

[0017] Figure 2 yes Figure 1 An exploded view of the process cartridge is shown.

[0018] Figure 3 yes Figure 1 The shown is a partial enlarged view of the processing box with the end cover removed.

[0019] Figure 4 It is a three-dimensional view of the separation block of the processing box of the present invention.

[0020] Figure 5 It is a schematic diagram of the first working state of the processing box of the present invention.

[0021] Figure 6 It is a schematic diagram of the second working state of the processing box of the present invention. DETAILED DESCRIPTION

[0022] The structure and other aspects of the processing box of the present invention are further described in detail below through specific implementations and with reference to the accompanying drawings.

[0023] like Figures 1 to 3 As shown, the process cartridge of the present invention comprises a developing unit 1 and a photosensitive unit 2. The developing unit 1 comprises a developing housing 11 and a developing roller 12. The developing roller 12 is rotatably mounted on the developing housing 11. The developing housing 11 has a cavity for accommodating new developer. The photosensitive unit 2 comprises a photosensitive housing 21, a photosensitive drum 22 and a charging roller (not shown in the figure). The photosensitive drum 22 and the charging roller are rotatably mounted on the photosensitive housing 21. The charging roller is arranged parallel to the photosensitive drum 22 and is used to charge the surface of the photosensitive drum 22.

[0024] The photosensitive drum 22 includes a roller shaft 221 and a roller 222. The roller 222 is fixedly mounted on the roller shaft 221, and the roller 222 rotates together with the roller shaft 221. Both ends of the roller shaft 221 are rotatably mounted on the photosensitive housing 21. A driving head 223 is mounted on one end of the roller shaft 221, and the driving head 223 is coupled to a driving motor in the imaging device to receive a driving force from the imaging device. The roller 222 is made of metal, usually an aluminum cylinder. A photosensitive coating is provided on the circumferential surface of the roller 222. Along the length direction of the roller 222, the length of the photosensitive coating is less than the length of the roller 222, so that at both ends of the roller 222, at least part of the roller 222 is not covered by the photosensitive coating.

[0025] The process box of the present invention further comprises a conductive member 4 and a separation block 5, wherein the conductive member 4 electrically connects the roller 222 and the roller shaft 221. The roller shaft 221 is electrically connected to the imaging device and finally grounded. In a specific embodiment, the conductive member 4 is a metal torsion spring. The conductive member 4 has a first end 41 and a second end 42, wherein the first end 41 is electrically connected to the roller shaft 221, and the second end 42 can be electrically connected to the roller 222, thereby electrically connecting the roller 222 to the roller shaft 221. Specifically, the second end 42 of the conductive member 4 overlaps the position of the roller 222 that is not covered by the photosensitive coating. The separation block 5 is rotatably mounted at one end of the process box. The separation block 5 can move from a first position to a second position. When the separation block 5 moves, the second end 42 of the conductive member 4 can be moved to separate the second end 42 from the roller 222. In the first position, the conductive member 4 contacts the roller 222, thereby electrically connecting the roller 222 to the roller shaft 221. In the second position, the conductive member 4 is separated from the roller 222 so as to cut off the electrical connection between the roller 222 and the roller shaft 221 .

[0026] In a specific embodiment, a bracket 111 is provided at one end of the developer housing 11, and the bracket 111 is detachably mounted to one end of the developer housing 11. The bracket 111 is used to support rotatable parts on the developer unit 1, such as the roller shaft of the developer roller 12 and the transmission gear. The bracket 111 is provided with a column 112, and the separation block 5 is rotatably mounted on the column 112. The conductive member 4 is also mounted on the bracket 111, and the bracket 111 is provided with a column 113, and the middle part of the conductive member 4 is sleeved on the column 113. Figure 4 As shown, in one embodiment, a separation protrusion 51 is provided on the separation block 5 . When the separation block 5 is rotated, the separation protrusion 51 contacts and pushes the second end 42 of the conductive member 4 to move, thereby separating the second end 42 from the roller 222 .

[0027] The processing box of the present invention can be detachably installed in an imaging device, and the imaging device is provided with a separator 7, and the separator 7 is rotatably installed in the imaging device. Specifically, the first end 71 of the separator 7 is rotatably installed in the imaging device, and the second end 72 is in contact with the elastic member 8, and the second end 72 can return to the initial position under the action of the elastic member 8. The second end 72 is a hook body. When the separator 7 moves, it can push the separation block 5 to move from the first position to the second position. The structure and working principle of the imaging device and the separator are disclosed in detail in Chinese patent CN104583879A, and the present invention only improves the structure of the processing box.

[0028] When the process cartridge of the present invention is installed in the imaging device along the installation direction X, the separation block 5 of the process cartridge will force the second end 72 of the separation member 7 to retreat, and the separation member 7 rotates around the first end 71. The second end 72 moves downward under the pressure of the separation block 5 and forces the elastic member 8 to contract, so that the separation block 5 of the process cartridge can pass over the second end 72 of the separation member 7 and be installed to a predetermined position, such as Figure 5 When the separation block 5 passes over the second end 72 of the separation member 7 , the second end 72 returns to the initial position under the action of the elastic member 8 .

[0029] When the process cartridge of the present invention leaves the factory and the imaging device is in color printing mode, for the process cartridges of four colors, the first end 41 of the conductive member 4 is electrically connected to the roller 221, and the second end 42 is electrically connected to the roller 222. When the imaging device is in black and white printing mode, three of the color process cartridges need to stop working, and only the black process cartridge is in working state. The separation member 7 corresponding to the color process cartridge in the imaging device moves along the installation direction X, and pulls the separation block 5 to rotate from the first position to the second position. When the separation block 5 rotates, the separation protrusion 51 of the separation block 5 pushes the second end 42 of the conductive member 4 to move, so that the second end 42 of the conductive member 4 is separated from the roller 222 of the photosensitive drum 22, as shown in FIG. Figure 6 As shown, the electrical connection between the roller 222 and the roller shaft 221 is cut off at this time. The laser head of the imaging device irradiates the photosensitive coating of the photosensitive drum 22. Since the electrical connection between the roller 222 and the roller shaft 221 is cut off, the charge on the photosensitive coating will not be conducted away through the roller 222 and the roller shaft 221, so that the developer on the developing roller 12 will not be transferred to the photosensitive drum 22, so that the processing box is in a non-working state.

[0030] When the imaging device needs to be in color printing mode again, the separation member 7 corresponding to the color processing box moves in the direction opposite to the installation direction X, the second end 42 of the conductive member 4 elastically recovers and drives the separation block 5 to recover to the initial state, and the second end 42 of the conductive member 4 contacts the roller 222 again, thereby electrically connecting the roller 222 and the roller shaft 221, and the color processing box can work normally.

[0031] The processing box of the present invention electrically connects the roller 222 and the roller shaft 221 of the photosensitive drum 22 through the conductive member 4, and moves the conductive member 4 through the separation block 5 to separate the conductive member 4 from the roller 222, thereby cutting off the electrical connection between the roller 222 and the roller shaft 221, thereby achieving the state of stopping the processing box without moving the photosensitive unit.

[0032] The above embodiments are only used to illustrate the concept and scope of the present invention, and are not used to limit the protection scope of the present invention. Modifications, equivalent substitutions and other improvements to the above embodiments that are obvious to those skilled in the art are also within the concept of the present invention. The protection scope and concept of the present invention are specifically defined by the claims.

Claims

1. A process cartridge that can be detachably mounted in an imaging device having a separate member, the process cartridge comprising A developing unit, comprising a developing housing and a developing roller rotatably mounted on the developing housing; as well as The photosensitive unit comprises a photosensitive housing and a photosensitive drum rotatably mounted on the photosensitive housing, wherein the photosensitive drum comprises a roller shaft and a roller mounted on the roller shaft, and the surface of the roller has a photosensitive coating; It is characterized in that The processing box also includes: A conductive member, wherein the conductive member electrically connects the roller and the roller shaft; as well as A separation block can be moved from a first position to a second position to move the conductive member. In the first position, the conductive member contacts the roller so that the roller is electrically connected to the roller shaft; in the second position, the conductive member is separated from the roller so that the electrical connection between the roller and the roller shaft is cut off.

2. The process cartridge according to claim 1, wherein: The separation block is rotatably mounted on one end of the process cartridge, and the separation block can be rotated from a first position to a second position.

3. The process cartridge according to claim 1, wherein: The separation block comprises a separation protrusion, and when the separation protrusion moves, it can force the conductive member to separate from the roller.

4. The process cartridge according to claim 1, wherein: The process cartridge includes a bracket that can be detachably mounted to an end portion of the developing housing.

5. The process cartridge according to claim 4, wherein: The separation block is mounted on the bracket.

6. The process cartridge according to claim 1, wherein: The conductive member includes a first end and a second end, wherein the first end can be electrically connected to the roller shaft, and the second end can be electrically contacted with the roller.

7. The process cartridge according to claim 6, wherein: The conductive member is a torsion spring.

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