Image forming apparatus

Abstract

This application belongs to the field of printing products, and particularly relates to an image forming apparatus. This apparatus mounts an LED printhead on a bracket rotatably connected to the inner wall of a housing. During the rotation of the bracket from a maintenance position to a working position, the bracket moves the LED printhead from outside the housing to inside and closer to the photosensitive drum in the processing cartridge. During the rotation of the bracket from the working position to the maintenance position, the bracket moves the LED printhead away from the processing cartridge. When the processing cartridge needs to be replaced or the internal structure needs maintenance, the cover is opened, and the bracket is flipped to the maintenance position. At this time, the LED printhead is outside the housing, preventing any impact damage to the LED printhead during replacement or maintenance. After replacement or maintenance, the bracket is lowered, moving the LED printhead from outside the housing to inside, closer to, and finally aligned with the photosensitive drum in the processing cartridge.

Description

Technical Field

[0001] This application relates to the field of printing product technology, and more particularly to an image forming device. Background Technology

[0002] Currently, the most commonly used light sources in image forming equipment (such as printers or digital copiers) are lasers and LED printheads. Lasers use a laser light source; the laser beam emitted by the source is deflected by a deflector and refracted by a lens before shining onto the photosensitive drum, forming a dot beam. A printing signal is modulated onto this beam. When the beam shines on the photosensitive drum, an electrostatic latent image is formed where the printing signal is located. After charging and attracting toner, the image is transferred and fixed before being output as a printed image. LED printheads operate on a different principle. An LED printhead consists of a strip of LEDs arranged in an array, with each physical pixel corresponding to a light-emitting diode (LED). Under the control of the printing signal, the LED corresponding to the area to be printed illuminates, and the resulting light is projected directly onto the surface of the photosensitive drum through a focusing head, completing the photosensitivity process.

[0003] Because lasers require multiple optical components such as deflectors and lenses to generate a single-point beam, resulting in a long optical path and susceptibility to environmental influences, they are typically fixed within the printer body, occupying significant space. Furthermore, a high-power laser source is required to ensure the beam remains focused on the photosensitive drum surface after its long optical path. In contrast, LED printheads are smaller and suitable for portable image forming equipment. An LED printhead is a solid-state light source composed of thousands of independent light-emitting components, such as LEDs. Each individual LED generates a single-point beam with relatively low power, necessitating its placement close to the photosensitive drum surface. This design makes the LED printhead susceptible to impact damage during drum replacement, affecting its performance and lifespan. Summary of the Invention

[0004] This application provides an image forming apparatus to solve the technical problem that the replacement of the toner cartridge in existing image forming apparatuses can easily cause collision damage to the LED printhead, affecting the performance and service life of the LED printhead.

[0005] To achieve the above objectives, this application provides an image forming apparatus, including a body, a cover, a bracket, and an LED printhead; the body includes a housing with a top opening, and a processing box can be detachably installed inside the housing; the cover is disposed on the top of the housing and is used to open or close the opening; one end of the bracket is rotatably connected to one side of the inner wall of the housing, and the bracket can rotate relative to the housing between a maintenance position and a working position; the LED printhead is disposed on the bracket; during the process of the bracket rotating from the maintenance position to the working position, the bracket drives the LED printhead closer to the photosensitive drum in the processing box; during the process of the bracket rotating from the working position to the maintenance position, the bracket drives the LED printhead away from the photosensitive drum in the processing box.

[0006] Optionally, during the process of the bracket rotating from the maintenance position to the working position, the bracket drives the LED print head to move from outside the housing to inside the housing. When the bracket is in the working position, the bracket and the LED print head are located inside the housing and do not protrude from the opening.

[0007] Optionally, the upper part of the housing is provided with a hinge seat and a limiting notch, the hinge seat and the limiting notch being positioned higher than the processing box; one end of the bracket is hinged to the hinge seat, and when the bracket is in the working position, the end of the bracket away from the hinge seat is limited within the limiting notch, and the LED print head is substantially parallel to the axis of the photosensitive drum in the processing box.

[0008] Optionally, the inner wall of the limiting notch is provided with a first locking part, and the end of the bracket away from the hinge seat is provided with a second locking part that can be locked in place with the first locking part.

[0009] Optionally, one of the first latching portion and the second latching portion is a latching groove, and the other is a protrusion adapted to the latching groove.

[0010] Optionally, the hinge seat includes two spaced-apart side plates and a fixing plate connected between the two side plates. The fixing plate is fixed to the inner wall of the opening. A rotating shaft is connected between the two side plates. A hinge ear is spaced-apart at one end of the bracket. The hinge ear is located between the two side plates and is rotatably connected to the rotating shaft.

[0011] Optionally, the mounting plate is provided with cable passage holes for transmitting data and power signals.

[0012] Optionally, the processing box is provided with an opening for inserting the LED printhead, and both ends of the processing box along its length are provided with support platforms for supporting the two ends of the LED printhead along its length.

[0013] Optionally, the support platform is provided with a notch for accommodating the protrusions at both ends of the LED printhead, thereby increasing the contact area between the support platform and the ends of the printhead.

[0014] Optionally, the LED printhead is elastically connected to the bracket.

[0015] Optionally, the bracket includes a top plate, a turning plate, and a receiving plate connected in sequence. One end of the top plate is rotatably connected to one side of the inner wall of the housing. When the bracket is in the maintenance position, one side of the top plate abuts against the inner side of the housing.

[0016] Optionally, the print head is mounted on a mounting plate, and the support plate of the bracket is provided with a plurality of through holes spaced apart along its length. A pin is movably inserted into each of the through holes. One end of the pin is connected to the mounting plate, and the other end of the pin is provided with a limiting head with a size larger than the inner diameter of the through hole. A spring is sleeved on the pin, and the two ends of the spring elastically abut against the mounting plate and the support plate, respectively.

[0017] Optionally, the receiving plate is provided with an opening, and the mounting plate is provided with an opening at the corresponding position of the cable socket on the print head. The cable for transmitting data and power signals passes through the space between the top plate and the receiving plate, and passes through the opening on the receiving plate and the opening on the mounting plate in sequence to connect to the cable socket on the print head.

[0018] The beneficial effects of the image forming apparatus provided in this application are as follows: Compared with the prior art, the image forming apparatus of this application sets the LED printhead on a bracket that is rotatably connected to the inner wall of the housing. The bracket can rotate relative to the housing between the maintenance position and the working position. During the process of the bracket rotating from the maintenance position to the working position, the bracket drives the LED printhead to move from outside the housing to inside the housing and close to the photosensitive drum in the processing box. During the process of the bracket rotating from the working position to the maintenance position, the bracket drives the LED printhead away from the processing box and moves to outside the housing.

[0019] With this setup, when the processing cartridge needs to be replaced or the internal parts of the machine need to be inspected, the cover is opened and the bracket is flipped to the inspection position. At this time, the LED printhead is located outside the housing, so the LED printhead will not be bumped or damaged during the process of replacing the processing cartridge or inspecting the internal parts of the machine. After the replacement or inspection is completed, the LED printhead is moved from outside the housing to inside the housing during the process of lowering the bracket, approaching and finally aligning with the photosensitive drum in the processing cartridge, so as to expose the photosensitive drum during the image formation process. Finally, the cover is closed. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] in:

[0022] Figure 1 This is a schematic diagram of the structure of an image forming apparatus with the cover open and the support in the maintenance position, as shown in one embodiment of this application.

[0023] Figure 2 This is a schematic diagram of the structure of an image forming apparatus with the cover open and the support in the working position, as shown in an embodiment of this application.

[0024] Figure 3 This is a cross-sectional view of an image forming apparatus with the cover closed and the support in the working position, as shown in an embodiment of this application.

[0025] Figure 4 This is a schematic diagram illustrating the connection between the support and the hinge seat in an image forming apparatus when the support is in the maintenance position, according to an embodiment of this application.

[0026] Figure 5 This is a schematic diagram of the structure of the hinge seat in an image forming apparatus according to an embodiment of this application;

[0027] Figure 6 This is a schematic diagram of the structure of the limiting notch in the inner wall of the housing in an image forming apparatus according to an embodiment of this application;

[0028] Figure 7 This is a schematic diagram illustrating the connection between the support and the LED printhead in an image forming apparatus according to an embodiment of this application;

[0029] Figure 8 This is a schematic diagram of the end of an LED printhead in an image forming apparatus according to an embodiment of this application;

[0030] Figure 9 This is a side view schematic diagram illustrating the connection between the support and the LED printhead in an image forming apparatus according to an embodiment of this application;

[0031] Figure 10 This is a schematic diagram of the structure of the processing box in an image forming apparatus according to an embodiment of this application.

[0032] Explanation of key component symbols:

[0033] 10. Body; 11. Housing; 111. Opening; 1111. Limiting notch; 11111. First snap-fit ​​part; 12. Processing box; 1201. Photosensitive port; 12011. Support; 121. Photosensitive drum;

[0034] 20. Engine cover;

[0035] 30. Bracket; 301. Hinge lug; 302. Second snap-fit ​​part; 31. Top plate; 32. Turning plate; 33. Support plate;

[0036] 40. LED printhead; 401. Folded section; 402. End edge; 403. Protrusion; 404. Flat surface;

[0037] 50. Hinge base; 51. Side plate; 52. Fixing plate; 521. Cable guide hole; 53. Rotating shaft;

[0038] 60. Pin; 61. Limit head;

[0039] 70. Spring;

[0040] 80. Mounting plate. Detailed Implementation

[0041] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings. Preferred embodiments of this application are shown in the drawings. However, this application can be implemented in many other different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of this application.

[0042] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0043] It should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0044] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0045] It should also be noted that in the embodiments of this application, the same reference numerals are used to represent the same component or part. For the same part in the embodiments of this application, the reference numerals may only be used to mark one part or component as an example. It should be understood that the reference numerals are also applicable to other identical parts or components.

[0046] As described in the background section, the single-point beam power generated by a single LED in an LED printer is relatively small. In order to ensure print quality, reduce beam attenuation, and reduce the size of the printer, the LED printhead needs to be arranged closer to the surface of the photosensitive drum. This design makes the LED printhead prone to collision damage during internal maintenance or drum replacement, affecting the performance and lifespan of the LED printhead.

[0047] To address the aforementioned problems, embodiments of this application provide an image forming apparatus, such as... Figures 1-3 As shown, the image forming apparatus includes a body 10, a cover 20, a support 30, and an LED printhead 40. The body 10 includes a housing 11 with an opening 111 at the top. It can be understood that the housing 11 houses a processing cartridge 12, a fixing module, a paper transport module, etc. The processing cartridge 12 can be detachably installed within the housing 11. The processing cartridge 12 includes a developing cartridge and a drum cartridge, which can be separate or integrated (e.g.,...). Figure 10 (As shown), the developing cartridge includes a developing roller and a toner cartridge, and the drum cartridge includes a photosensitive drum 121. Understandably, when the toner inside the processing cartridge 12 is depleted, it needs to be replaced; the cover 20 is located on the top of the housing 11 and is used to open or close the opening 111; one end of the bracket 30 is rotatably connected to one side of the inner wall of the housing 11, and the bracket 30 can be positioned relative to the housing 11 in a maintenance position (e.g., ...). Figure 1 (as shown) and work location (e.g.) Figure 2 and Figure 3 The LED printhead 40, mounted on the support 30, rotates between the maintenance position and the working position. During the rotation of the support 30 from the maintenance position to the working position, the support 30 moves the LED printhead 40 from outside the housing 11 to inside the housing 11 and closer to the photosensitive drum 121 in the processing box 12. During the rotation of the support 30 from the working position to the maintenance position, the support 30 moves the LED printhead 40 away from the photosensitive drum 121 in the processing box 12 and back outside the housing 11. The maintenance position can also be called the open position, where the processing box can be replaced or the equipment can be repaired.

[0048] The image forming apparatus mounts the LED printhead 40 on a bracket 30 rotatably connected to the inner wall of the housing 11. The bracket 30 can rotate relative to the housing 11 between a maintenance position and a working position. Thus, when it is necessary to replace the processing cartridge 12 or perform internal maintenance on the machine body 10, the cover 20 is opened, and the bracket 30 is flipped to the maintenance position. Figure 1 As shown, the LED printhead 40 is located outside the housing 11 at this time. During the process of replacing the processing box 12 or repairing the inside of the machine body 10, the LED printhead 40 will not be damaged by bumps. After the replacement or repair is completed, during the process of lowering the bracket 30, the LED printhead 40 is moved from outside the housing 11 to inside the housing 11, close to and finally aligned with the photosensitive drum 121 in the processing box 12, so as to expose the photosensitive drum 121 during the image formation process. Finally, the cover 20 is closed.

[0049] Furthermore, such as Figure 2 and Figure 3 As shown, when the support 30 is in the working position, the support 30 is located inside the housing 11 and does not protrude from the opening 111. This configuration makes the entire image forming device structure more compact, allowing for a smaller size and easier portability; in addition, the top of the entire body 10 is flush, ensuring that the opening 111 can be tightly closed by the cover 20.

[0050] In some embodiments, such as Figure 1 and Figure 2 As shown, the inner side of the hood 20 is also provided with ribs, which enhance the strength of the hood 20.

[0051] In one embodiment, such as Figures 1-2 , Figure 4 and Figure 6 As shown, a hinge seat 50 and a limiting notch 1111 are disposed opposite each other on the upper part of the housing 11, and the hinge seat 50 and the limiting notch 1111 are positioned higher than the processing box 12. One end of the bracket 30 is hinged to the hinge seat 50. When the bracket 30 is in the working position, the end of the bracket 30 away from the hinge seat 50 is confined within the limiting notch 1111, and the length direction of the LED print head 40 is substantially parallel to the axial direction of the photosensitive drum 121 in the processing box 12.

[0052] Understandably, the longitudinal direction (also referred to as the "main scanning direction") of the LED printhead 40 is parallel to the axis of the photosensitive drum 121. The LED printhead 40 typically includes an LED array, a bar lens array, and a housing serving as a support component, configured to support the LED array and the bar lens array, which is configured to project light emitted by the LED array onto the photosensitive drum 121. The length of the support 30 is greater than the axial length of the photosensitive drum 121.

[0053] By setting the hinge seat 50, it is easy to install the bracket 30 on the inner wall of the housing 11. The limiting notch 1111 is used to limit the end of the bracket 30 away from the hinge seat 50, ensuring that the relative position between the LED print head 40 on the bracket 30 and the photosensitive drum 121 in the processing box 12 remains stable during the operation of the image forming device.

[0054] Furthermore, the inner wall of the limiting notch 1111 is provided with a first engaging portion 11111, and the end of the bracket 30 away from the hinge seat 50 is provided with a second engaging portion 302 that can engage with the first engaging portion 11111. When the bracket 30 is in the working position, the first engaging portion 11111 and the second engaging portion 302 engage with each other to fix the end of the bracket 30 away from the hinge seat 50 in the limiting notch 1111, further improving the reliability and stability of the LED print head 40 located on the bracket 30 during operation.

[0055] Specifically, one of the first engaging portion 11111 and the second engaging portion 302 is a slot, and the other is a protrusion adapted to the slot. Exemplarily, the first engaging portion 11111 is a vertically downward extending notch, and the second engaging portion 302 is a cylindrical rod. When an external force is applied to the bracket 30, the cylindrical rod can be engaged into or pulled out of the notch. It is conceivable that the first engaging portion 11111 and the second engaging portion 302 can have other structural forms, which are not limited here.

[0056] In one specific embodiment, such as Figures 4-5 , Figures 7-9 As shown, the hinge base 50 includes two spaced-apart side plates 51 and a fixed plate 52 connected between the two side plates 51. The hinge base 50 can be made of sheet metal and is U-shaped. The fixed plate 52 is fixed to the inner wall of the housing 11. A rotating shaft 53 connects the two side plates 51. Two hinge ears 301 are spaced apart at one end of the bracket 30. The two hinge ears 301 are located between the two side plates 51 and are rotatably connected to the rotating shaft 53. When the bracket 30 is in the maintenance position, one side of the bracket (e.g., the top plate) abuts against the inner side of the fixed plate 52 to keep the bracket stable. Figure 1 As shown, the bracket 30 is restricted from rotating to the side away from the opening 111, so that the bracket 30 eventually stops at the maintenance position. At this time, the angle between the bracket 30 and the photosensitive drum 121 is greater than 90 degrees, and there is no obstruction at the opening 111, which provides user operating space and facilitates the user to remove or install the processing box 12 and to perform maintenance on the inside of the machine body 10.

[0057] In addition, to facilitate the control of the cable routing of the LED printhead 40, such as Figures 4-5 , Figure 9As shown, a cable guide hole 521 is provided on the fixing plate 52, through which cables for transmitting data and power signals pass. After passing through the cable guide hole 521, the cable is fixed to the inner side of the bracket top plate 31. Figure 9 (As shown in the view below the top plate 31), the cable is positioned against the inner side of the top plate 31. Preferably, the bracket can rotate, and the width of the cable can be less than the distance between the hinge ears to prevent the bracket from touching the cable when rotating.

[0058] In one embodiment, such as Figures 7-9 As shown, the bracket 30 can be a sheet metal part, made of a strip of metal sheet through bending and punching. The bracket 30 includes a top plate 31, a turning plate 32, and a receiving plate 33 connected in sequence. One end of the top plate 31 is rotatably connected to one side of the inner wall of the housing 11. When the bracket 30 is in the maintenance position, one side of the top plate 31 abuts against the inner side of the housing 11. The bracket 30 is provided with a wiring channel composed of the top plate 31, the receiving plate 33, and the mounting plate 80. Cables used to transmit data and power signals are connected to the LED print head through the wiring channel. Specifically, the receiving plate 33 of the bracket 30 has an opening in the middle, and the mounting plate 80 has an opening at the corresponding position of the cable socket on the print head. The cable that is close to the inner side of the top plate 31 passes through the opening of the receiving plate 33 and is connected to the ribbon cable socket (cable socket) of the print head 40 at the opening of the mounting plate 80.

[0059] Preferably, the bracket 30 can be made of sheet metal, which is convenient to process, has high structural strength, and occupies less space, making it convenient for miniaturization and portable design of image forming equipment.

[0060] Specifically, the angles between the transition plate 32 and the receiving plate 33 and between the transition plate 32 and the top plate 31 are both acute. In the working position, the top plate 31 is horizontal, and the LED print head 40 located on the receiving plate 33 is obliquely inserted into the photosensitive port on the processing box 12 (i.e., the opening above the photosensitive drum in the processing box), and is directly facing the photosensitive drum 121 in the processing box 12.

[0061] Of course, in other embodiments, the bracket 30 can also be integrally injection molded from plastic.

[0062] In one specific embodiment, such as Figure 4 , Figure 6 and Figure 10 As shown, the processing box 12 is provided with a photosensitive port 1201 for inserting the LED printhead 40. At both ends of the processing box along its length are support platforms 12011 for supporting the LED printhead 40 along its length. The support platforms 12011 limit the depth of the LED printhead 40 inserted into the photosensitive port 1201, ensuring that the distance between the LED printhead 40 and the photosensitive drum 121 remains constant each time the support 30 switches to the working position.

[0063] Specifically, such as Figure 1 , Figure 3 and Figures 8-10 As shown, when the bracket 30 switches to the working position, during the interlocking process between the first latching part 11111 of the housing 11 and the second latching part 302 of the bracket 30, the spring 70 between the mounting plate 80 and the receiving plate 33 of the bracket 30 is compressed, thereby causing both ends of the LED printhead 40 to abut against the support platform 12011. Ultimately, this ensures a tight, gapless contact between the LED printhead 40 and the support platform 12011 on the processing box 12, achieving a positioning accuracy of tens of micrometers between the LED printhead and the photosensitive drum.

[0064] For example, such as Figures 8-10 As shown, the LED printhead 40 has an end ridge 402 at the end of the folded section 401 extending outwards from the end, and the end ridge 402 abuts against the support table 12011. Optionally, the support table 12011 may be provided with a notch to accommodate the end protrusion 403 of the LED printhead 40, so that the plane 404 behind the end ridge 402 of the LED printhead 40 can also abut against the support table 12011, increasing the contact area between the end of the LED printhead 40 and the support table, and ensuring structural strength. The end ridge 402 and the plane 404 are coplanar.

[0065] In one embodiment, such as Figure 1 , Figure 3 and Figure 9 As shown, the LED printhead 40 is elastically connected to the bracket 30. The LED printhead 40 is detachably mounted on the mounting plate 80. For example, through holes are provided at both ends of the printhead 40, and threaded holes are correspondingly provided on the mounting plate 80. Screws pass through the through holes and into the threaded holes to achieve a fixed connection between the LED printhead 40 and the mounting plate 80. Specifically, in one implementation, multiple pins 60 are fixedly connected to the mounting plate 80 or are integral parts. Multiple through holes are provided at intervals along the length of the receiving plate 33 of the bracket 30. Multiple pins 60 can pass through multiple through holes. A limiting head 61 with a size larger than the inner diameter of the through hole is provided at the end of the pin 60, thereby connecting the receiving plate 33 and the mounting plate 80. A spring 70 is sleeved on the pin 60, and the two ends of the spring 70 elastically abut against the mounting plate 80 and the receiving plate 33, respectively, thereby achieving an elastic connection between the mounting plate 80 and the receiving plate 33. Preferably, there can be two pins 60 and two through holes. The pins 60 can be respectively set at both ends of the mounting plate 80 along its length, and correspondingly, the through holes can be respectively set at both ends of the receiving plate 33 along its length.

[0066] Therefore, when the bracket 30 is in the maintenance position, the spring 70 between the mounting plate 80 and the receiving plate 33 of the bracket 30 is in a free state. During replacement of the processing cartridge or maintenance of the image forming equipment, if the LED printhead 40 is accidentally bumped, the elastic structure between the LED printhead 40 and the bracket 30 can provide a certain degree of cushioning and shock absorption, reducing the chance of damage to the LED printhead 40. Furthermore, during the rotation of the bracket 30 from the maintenance position to the working position, it prevents the ends or edges of the LED printhead 40 from making hard contact with the vicinity of the photosensitive port 1201 on the processing cartridge 12, thus avoiding damage to the LED printhead 40.

[0067] Of course, the flexible connection between the LED printhead 40 and the bracket 30 can also have other structural forms, which are not limited here.

[0068] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combination of these technical features does not contradict each other, it should be considered within the scope of this specification. The above embodiments only illustrate several implementation methods of this application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. An image forming apparatus, characterized in that, It includes a body, a cover, a bracket, and an LED printhead; the body includes a housing with an opening at the top, and a processing box can be detachably installed inside the housing; the cover is located at the top of the housing and is used to open or close the opening; One end of the bracket is rotatably connected to one side of the inner wall of the housing. The bracket can rotate relative to the housing between a maintenance position and a working position. The LED printhead is disposed on the bracket. During the process of the bracket rotating from the maintenance position to the working position, the bracket drives the LED printhead closer to the photosensitive drum in the processing box; during the process of the bracket rotating from the working position to the maintenance position, the bracket drives the LED printhead away from the photosensitive drum in the processing box. The upper part of the housing is provided with a hinge seat and a limiting notch, the hinge seat and the limiting notch are positioned higher than the processing box; one end of the bracket is hinged to the hinge seat, when the bracket is in the working position, the end of the bracket away from the hinge seat is limited within the limiting notch, and the LED print head is substantially parallel to the axis of the photosensitive drum in the processing box. The inner wall of the limiting notch is provided with a first locking part, and the end of the bracket away from the hinge seat is provided with a second locking part that can be locked in place with the first locking part.

2. The image forming apparatus according to claim 1, characterized in that, During the process of the bracket rotating from the maintenance position to the working position, the bracket drives the LED print head to move from outside the housing to inside the housing. When the bracket is in the working position, the bracket and the LED print head are located inside the housing and do not protrude from the opening.

3. The image forming apparatus according to claim 1, characterized in that, One of the first latching part and the second latching part is a latching groove, and the other is a protrusion that is adapted to the latching groove.

4. The image forming apparatus according to claim 1, characterized in that, The hinge seat includes two spaced-apart side plates and a fixing plate connected between the two side plates. The fixing plate is fixed to the inner wall of the opening. A rotating shaft is connected between the two side plates. A hinge ear is spaced-apart at one end of the bracket. The hinge ear is located between the two side plates and is rotatably connected to the rotating shaft.

5. The image forming apparatus according to claim 4, characterized in that, The mounting plate is provided with cable passage holes, through which cables for transmitting data and power signals pass.

6. The image forming apparatus according to claim 1, characterized in that, The processing box has an opening for inserting the LED printhead, and both ends of the processing box along its length are provided with support platforms for supporting the two ends of the LED printhead along its length.

7. The image forming apparatus according to claim 6, characterized in that, The support platform is provided with a notch, which is used to accommodate the protrusions at both ends of the LED printhead, so as to increase the contact area between the support platform and the end of the printhead.

8. The image forming apparatus according to any one of claims 1-7, characterized in that, The LED printhead is elastically connected to the bracket.

9. The image forming apparatus according to claim 8, characterized in that, The support includes a top plate, a turning plate, and a receiving plate connected in sequence. One end of the top plate is rotatably connected to one side of the inner wall of the housing. When the support is in the maintenance position, one side of the top plate abuts against the inner side of the housing.

10. The image forming apparatus according to claim 9, characterized in that, The printhead is mounted on the mounting plate. The support plate of the bracket has multiple through holes spaced apart along its length. A pin is movably inserted into each of the through holes. One end of the pin is connected to the mounting plate, and the other end of the pin is provided with a limiting head with a size larger than the inner diameter of the through hole. A spring is sleeved on the pin, and the two ends of the spring elastically abut against the mounting plate and the support plate, respectively.

11. The image forming apparatus according to claim 10, characterized in that, The receiving plate has an opening, and the mounting plate has an opening at the corresponding position of the cable socket on the print head. The cable for transmitting data and power signals passes through the space between the top plate and the receiving plate, and passes through the opening on the receiving plate and the opening on the mounting plate in sequence to connect to the cable socket on the print head.

Images