CN201000546Y - Process cartridges for laser printers - Google Patents

Abstract

The utility model relates to a laser printer processing box, which comprises an organic photo conductor, a developer roller and a positioning mechanism. The positioning mechanism comprises a helical spring, a positioning block, a first pivot axle and a second pivot axle. The large diameter section of the first pivot axle is the same diameter with the pivot center and can extend into the pivot center or shrink into one of handle rotating arms along axial direction of the organic photo conductor. The spring is suited on the small diameter section of the first pivot axle and is arranged between the large diameter section of the first pivot axle and the handle rotating arms. The second pivot axle being by the way of being perpendicular to the middle axle of the organic photo conductor fixed on the end of the first pivot axle perforating one of the handle rotating arms. The positioning block is fixed on the second pivot axle and is provided with an eccentric rotating part and a locking part. The locking part deviates form one of the handle rotating arms when the peripheral of the eccentric rotating part being far from the second pivot axle contacts one of the handle rotating arms; the locking part presses one of the handle rotating arms when the peripheral of the eccentric rotating part being nearer form the second pivot axle contacts one of the handle rotating arms. The processing box has the advantage that the processing box is easy to disassemble and maintain.

Description

Process cartridges for laser printers

technical field

The utility model relates to a processing box for electrophotographic imaging equipment such as a laser printer. The processing box is based on an induction unit capable of converting laser signals into electrostatic latent images and a developing unit capable of displaying electrostatic latent images as visible images. The sensing unit includes a photosensitive drum, and the developing unit includes a developing roller. The process box is also provided with a handle on the outer wall parallel to the axial direction of the photosensitive drum or the developing roller, which can take into account the convenience of operation and carrying by the printing personnel when loading and unloading the process box and has a paper guiding function.

Background technique

Electrophotographic imaging devices, such as laser printers, irradiate a photosensitive drum with a predetermined potential by laser scanning to form an electrostatic latent image on its surface. The electrostatic latent image is developed with a predetermined toner, and then the developed image is transferred to the paper, and then the transferred image is fixed to become a visible image that can be observed by the naked eye, thereby realizing the image-signal - Transformation between images.

A common laser printer is provided with a charging roller, a photosensitive drum, a laser scanning mechanism, a developing device (or developing unit), a transfer roller and a fixing roller, etc. in its casing.

The photosensitive drum is charged to a predetermined potential by a charging roller, and forms an electrostatic latent image corresponding to an image to be printed in response to a laser beam emitted by a laser scanning mechanism.

The developing device stores toner in its built-in container, and transfers the toner to a photosensitive drum with an electrostatic latent image by using a toner feed roller and a developing roller.

The visible image formed on the photosensitive drum is transferred to the paper between the photosensitive drum and the transfer roller through the transfer roller, and finally the toner image on the paper is fixed by the fixing roller.

The above-mentioned developing device, on the one hand, uses the powder bin to undertake the storage task of toner, and on the other hand, the powder feeding roller and the developing roller are arranged inside the developing device at the same time, and the toner is transferred between the powder feeding roller and the developing roller through the powder feeding roller and the developing roller. The transfer between the rollers and the transfer of toner between the developing roller and the photosensitive drum complete the conversion between the electrostatic latent image of the photosensitive drum and the visible image. The developing device as a whole includes a powder bin, a powder feeding roller and a developing roller. It can be fixedly connected with the image processing unit where the photosensitive drum is located through a pin shaft and a pin hole. In this way, an integrated laser printer process box is obtained; Fit assembly when installing, what this way obtains is split-type laser printer processing box.

Domestic invention patent application CN200510084897.1 discloses an integrated developing unit with a foldable handle. Such a developing unit for an image forming apparatus includes at least one photoreceptor and a developing roller that spreads a developer onto the photoreceptor. The housing protects the image forming unit, and a handle is mounted to the housing to manipulate the developing unit. The handle pivots to a first position connected to the housing and a second position opposite the first position. This developing unit is essentially a process box that includes the functions of laser induction and image development. After the overall assembly is completed, its handle is completely fixed in the direction of the central axis of the photoreceptor, but it can be positioned at the first position and the second position. They can swing freely around the pivot center parallel to the horizontal plane when working, which is arranged on the edge of the housing without restriction. In this way, when the handle is in the first position, the handle body is close to the development unit casing, thereby reducing the space volume occupied by the development unit for storage and transportation; when the handle is in the second position, the handle body and the development unit casing The body is in a state of mutual expansion with the pivot center as the common base point, and then through the cooperation of the handle base with the corresponding stop projection near the pivot center, the handle is pulled under its own weight with the pivot center and the stop projection as the fulcrum. obtain a stable positioning. It can be seen that since the handle itself has a certain weight, its free swing mode is easily affected by changes in the spatial posture of the developing unit, so that under a specific spatial posture of the developing unit, for example, when the developing unit is turned over relative to the original position, the pivot center and the stopper bump will temporarily lose the fulcrum function, causing the handle to be in an unstable swing state between the first position and the second position, and may hit the developing unit casing or related parts of the printer due to the swing, causing corresponding Component damage.

Utility model content

The purpose of the utility model is to provide a processing box for a laser printer which can not only maintain the paper guiding function, but also has the characteristics of convenient loading and unloading and small volume during storage and transportation.

A process box for a laser printer designed according to the above purpose includes a laser induction unit, a developing unit and a positioning mechanism. The laser sensing unit and the developing unit are collectively assembled on the frame of the process box. The laser sensor unit includes a photosensitive drum that converts laser light from the printer into an electrostatic latent image. The developing unit includes a developing roller capable of laying developer on the surface of the photosensitive drum to convert the electrostatic latent image into a visible image. A pivot center parallel to the central axis of the photosensitive drum is arranged on the outer wall of the process cartridge frame parallel to the central axis of the photosensitive drum or the developing roller. The ends in the same direction of the two rotating arms of the handle are pivotally connected to the pivot center. The positioning mechanism is composed of a coil spring, a positioning block, a first pivot and a second pivot. The first pivot is divided into two sections with different diameters, and the larger section has the same diameter as the pivot center and can extend into the pivot center or retract into one of the handle rotating arms to its outer end surface along a direction parallel to the central axis of the photosensitive drum. It is flush with the surface perpendicular to the central axis of the photosensitive drum and facing the pivot center of one of the aforementioned handle rotating arms. The helical spring sleeve is placed on the smaller diameter section of the first pivot shaft and is located between the larger diameter section of the first pivot shaft and one of the aforementioned handle rotation arms. The second pivot shaft is fixed to the end of the first pivot shaft with a smaller diameter section passing through one of the rotating arms of the aforementioned handle in a manner perpendicular to the central axis of the photosensitive drum. The positioning block is fixed on the second pivot, and has an eccentric rotating part and a locking part that can rotate around the second pivot. When the peripheral edge of the eccentric rotating part farther from the second pivot contacts one of the aforementioned handle rotating arms, the position of the locking part deviates from one of the aforementioned handle rotating arms; the peripheral edge of the eccentric rotating part closer to the second pivot contacts the aforementioned handle rotating arm At one time, the locking portion presses against one of the rotating arms of the aforementioned handle.

In the processing box for a laser printer of the present utility model, the spiral spring in the positioning mechanism, the positioning block, the first pivot and the second pivot cooperate with each other, and the positioning block is manually controlled to rotate around the second pivot to perform positioning. Adjustment. When the periphery of the eccentric rotating part of the positioning block farther away from the second pivot contacts one of the above-mentioned handle rotating arms, the section with a larger diameter of the first pivot presses the coil spring to contract, and then the large-diameter section retracts into the above-mentioned handle in the swivel arm. In this state, the handle can be detached from the processing box, and the operator can easily remove the handle, pack or handle the handle and the processing box separately, so as to reduce or reduce the space occupied by the processing box, which is beneficial to storage, transportation, replacement or maintenance . When the periphery of the eccentric rotating part of the positioning block is closer to the second pivot contacting one of the above-mentioned handle rotating arms, the section with a larger diameter of the first pivot releases the pressure on the helical spring, forcing it to expand under its own elastic force, and then The large-diameter section is pushed to extend into the pivot center, and at the same time, the locking portion presses against one of the rotating arms of the handle so that the rotating arm is fixed. In this state, the handle is fixed on the process cartridge, and is assembled into the laser printer together with the process cartridge, and becomes a guide for guiding paper beyond a predetermined size into the transfer area of the printer, or a holding member for replacing the process cartridge.

Illustration

Fig. 1 is a schematic cross-sectional structure diagram of a laser printer using the process cartridge of the present invention, in which the process cartridge is installed in the laser printer.

Fig. 2 Perspective view 1 of the process box for the laser printer of the present invention.

Fig. 3 is the second perspective view of the processing box for the laser printer of the present invention.

Fig. 4 is a partially enlarged schematic diagram of a processing box for a laser printer of the present invention.

Fig. 5 Partial enlarged schematic diagram II of the process box for the laser printer of the present invention.

Fig. 6a is a perspective view of the positioning block, which is a component of the positioning mechanism of the process box of the present utility model.

Fig. 6b is a perspective view of a helical spring, a component of the positioning mechanism of the process cartridge of the present utility model.

Fig. 6c is a perspective view of the positioning mechanism component of the process box of the present utility model - the first pivot.

Fig. 6d is a second pivot perspective view of the components of the positioning mechanism of the process box of the present utility model.

Detailed ways

The utility model process box is described in detail below in conjunction with the accompanying drawings. Throughout the drawings, the same reference numerals will be used to refer to the same components, features or structures. The specific structure or parts aimed at in the embodiment introduction process are only used as reference examples for those skilled in the art to understand the process box of the present utility model, and those skilled in the art can also make a The technical scope and essence of the process box are various equivalent technical structures, so it cannot be simply considered that this exemplary description can be used to limit the scope of protection covered by the claims of the utility model process box, and the aforementioned equivalent technical structures should belong to the rights of the utility model the scope of protection required. Moreover, the applicant hereby omits descriptions of well-known functions and structures for the sake of brevity.

Fig. 1 shows the sectional structure of a laser printer applying the process cartridge of the present invention. The constituent elements of the printer A include a printer frame 1, a paper magazine 2 for storing a predetermined amount of a recording medium of a predetermined size such as paper, a conveying roller 3 for conveying a recording medium such as paper, a process box having a laser sensor function and an image developing function 4 and a fixing unit 5 for curing the image. Inside the printer frame 1, a second recording medium conveying frame 6 is attached between the process box 4 and the paper bin 2, so that when the paper stored in the paper bin 2 cannot meet the printing size requirement, it is transferred from the second recording medium. Frame 6 feeds other papers of suitable size. The aforementioned printer frame 1, paper bin 2, conveying roller 3, process box 4, fixing unit 5 and second recording medium conveying frame 6 have basically the same structure and function as the known laser printer, and will not repeat them here. The process cartridge 4 will be introduced below, and the handle 7 pivotally connected to the process cartridge frame 401 and its mechanical structural relationship with the process cartridge frame 401 will be described in detail.

Referring to Fig. 1, the process cartridge 4 includes a photosensitive drum 402 that responds to laser irradiation and then transforms into an electrostatic latent image, a process cartridge frame 401 that provides protection and support functions, and is used for laying toner to convert the electrostatic latent image on the photosensitive drum 402 A developing roller (not shown) for visualizing a toner image and a handle 7 mounted on the cartridge frame 401 . The process cartridge 4 can be assembled into the printer frame 1 and can also be detached from the printer frame 1 . In this way, when the process cartridge 4 needs to be replaced or the printer A is maintained, the process cartridge 4 can be removed from the printer A in good time.

The photosensitive drum 402 is rotatably supported in the cartridge frame 401 . At least one end portion 403 of itself for providing charging function to the photosensitive drum 402 extends to the outside of the process cartridge frame 401 along the central axis direction of the photosensitive drum 402, and this end portion 403 is sent to it by the printer A as the conductive terminal of the photosensitive drum 402. Electric energy is supplied, and then the surface of the photosensitive drum 402 is charged. The cylindrical drum surface of the photosensitive drum 402 is irradiated by the laser light emitted from the laser scanning unit 8 inside the printer frame 1, and a discharge effect is formed in the irradiated area, and the area where the charge is released is converted into an electrostatic latent image. The developing roller lays the toner on the electrostatic latent image to convert it into a visible toner image. The visible toner image is moved to the paper surface by the transfer mechanism, and is permanently fixed on the paper surface by the high temperature and high pressure applied by the paper carrier through the fixing unit 5 .

Referring to Fig. 2, 3, 4, 5, on the outer wall 404 of the process cartridge frame 401 parallel to the central axis of the photosensitive drum 402 and the developing roller, approximately in the middle, two coaxial pivots parallel to the central axis of the photosensitive drum 402 are provided. Center 405. The outer wall 404 of the process cartridge frame is located on the side of the process cartridge 4 facing away from the photosensitive drum 402. In the installed state, the outer wall 404 faces the second recording medium transport frame 6 (as shown in FIG. 1). The handle 7 has two swivel arms 701,702. The corresponding ends of one of the two rotating arms 701 are rotatably pivotally connected to the aforementioned corresponding pivot center 405 through the positioning mechanism 9, and the second 702 of the two rotating arms are rotatably pivotally connected to the aforementioned corresponding pivot center 405 middle. In this embodiment, the pivot center 405 receiving the second of the two rotating arms 702 is provided with a limiting plate 406 in the direction in which the second of the two rotating arms 702 rotates or swings around the pivot center 405 . Press the contact of the two rotating arms 702 and the two rotating arms 702 ends with the process box frame outer wall 404 by the limiting piece 406, and the two rotating arms 702 can be rotated around the pivot center 405. Or completely fixed in the direction of swing, so that the handle 7 is positioned circumferentially.

Referring to FIGS. 6 a to 6 b , the positioning mechanism 9 includes a helical spring 901 , a positioning block 902 , a first pivot 903 and a second pivot 904 .

The first pivot 903 is divided into two sections with different diameters. The larger section 9031 of its diameter is the same as the diameter of the pivot center 405 or slightly smaller than the pivot center 405, and can extend into the pivot center 405 along the direction parallel to the axis of the photosensitive drum 402, so that one of the handle rotating arms 701 is affected. Limited to the pivot center 405, or retracted into one of the handle rotating arms 701 to its axially outer end surface with one of the handle rotating arms 701 perpendicular to the central axis of the photosensitive drum 402 and flush with the surface facing the pivot center 405, so that the handle One of the swivel arms 701 is disengaged from the confinement of the pivot center 405 in order to disassemble the handle 7 (see Figs. 2, 4, 5, 6d).

The helical spring 901 is sleeved on the section 9032 of the first pivot 903 with a smaller diameter. In the state that positioning mechanism 9 and handle 7 are assembled on the process box 4, its position is between the larger section 9031 of first pivot 903 diameter and one of handle rotating arm 701 (referring to Fig. 4,5, 6b).

The smaller diameter section 9032 of the first pivot 903 passes through one of the handle rotating arms 701 along a direction parallel to the central axis of the photosensitive drum 402 in an assembled state, and its end 9033 is exposed outside of one of the handle rotating arms 701 . The second pivot 904 is fixed on the end 9033 of one of the rotating arms 701 of the handle in a manner perpendicular to the central axis of the photosensitive drum 402 (see FIGS. 5 and 6c).

The positioning block 902 is rotatably fixed on the second pivot 904 , and has an eccentric rotating portion 9021 and a locking portion 9022 that can rotate around the second pivot 904 . The positioning block 902 takes the form of an eccentric wheel centered around the second pivot 904 . When the positioning block 902 swings around the second pivot 904, when the peripheral edge of the eccentric rotating part 9021 farther from the second pivot 904 touches one of the handle rotating arms 701, the position of the locking part 9022 deviates from One of the handle rotating arms 701, while the larger diameter section 9031 of the first pivot 903 is pulled by the second pivot 904, one side compresses the coil spring 901, and the other side retracts into one of the handle rotating arms 701, so that the handle rotating arm One of the arms 701 is no longer constrained by the pivot center 405 and is in a free state. In the case that the second 702 of the two rotating arms is only pivotally connected to the pivot center 405 in a single direction along the axis of the pivot center 405, the The handle 7 can be freely disassembled (see Figures 2, 4, 5). When the peripheral edge of the eccentric rotating part 9021 of the positioning block 902, which is closer to the second pivot 904, touches one of the handle rotating arms 701, the locking part 9022 presses against the handle in the direction in which the handle 7 swings around the first pivot 903 One of the arms 701 is rotated, and the second pivot 904 releases the traction to the first pivot 903 at the same time, so that the larger-diameter section 9031 of the first pivot 903 extends into the pivot center 405 under the extension force of the helical spring 901 In this process, the circumferential positioning of one of the handle rotation arms 701 with the pivot center 405 as the rotation axis is completed. In this way, one of the handle rotating arms 701 is pressed by the clamping portion 9022, and the end of one of the handle rotating arms 701 contacts with the outer wall 404 of the process box frame, so that one of the handle rotating arms 701 is completely fixed. Finally, the two rotating arms 701 , 702 of the handle 7 cooperate axially along the pivot center 405 , so that the handle 7 is positioned along the axial direction of the photosensitive drum 402 . In this fixed state, the handle 7 is assembled into the printer A together with the process cartridge 4 for use (see FIG. 3 ).

Claims (1)

1. laser printer handle box, comprise laser induced unit and developing cell, described laser induced unit and described developing cell are concentrated and are assemblied on the framework of described handle box, described laser induced unit comprises the photosensitive drums that can be converted into the laser that described printer sends electrostatic latent image, described developing cell comprises that can lay developer at described photosensitive drum surface makes described electrostatic latent image be converted into the developer roll of visual image, the outer wall that described handle box framework is parallel to described photosensitive drums or described developer roll axis is provided with the pivot center that is parallel to described photosensitive drums axis, the end in the same way of two pivot arms of handle is articulated in described pivot center, it is characterized in that also comprising detent mechanism, described detent mechanism is by coil spring, locating piece, first pivot and second pivot constitute, described first pivot is divided into different two sections of diameter, the described first pivot diameter bigger one section with described pivot center with the footpath and can along the direction that is parallel to described photosensitive drums axis stretch into one of described pivot center or the described handle pivot arm of retraction to its outer face with one of described handle pivot arm perpendicular to described photosensitive drums axis and towards the flush at described pivot center, described coil spring be placed on that the described first pivot diameter less a section is gone up and the position between one of the described first pivot diameter bigger a section and described handle pivot arm between the two, described second pivot is fixed in the described first pivot diameter passes one of described handle pivot arm than segment termination in the mode perpendicular to described photosensitive drums axis, described locating piece is fixed on described second pivot, described locating piece has can be around the eccentric rotating part and the screens portion of described second pivot rotation, described eccentric rotating part from described second pivot week far away during along one of described handle pivot arm of contact described screens position offset from one of described handle pivot arm, described eccentric rotating part from nearer week of described second pivot during along one of described handle pivot arm of contact described screens portion press and touch one of described handle pivot arm.

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