Color laser printing device

Abstract

The invention discloses a color laser printing device. A plurality of pressure roller groups are arranged inside a printer shell. A fixing roller and a pressure roller matched therewith are arranged inside the printer shell and behind a toner cartridge working position. A slide rail is arranged inside the printer. The slide rail is slidably connected with a toner cartridge bracket. The toner cartridge is placed on the toner cartridge bracket. A motor and a transmission structure connected therewith are arranged on one side of the printer shell. When the toner cartridge is located at the working position, the transmission structure is connected with one end of the toner cartridge to drive a photosensitive drum, a developing roller, a charging roller and a stirring roller in the toner cartridge to rotate. A pressure roller matched therewith is arranged below the photosensitive drum. A toner powder adding channel is arranged at the other end of the toner cartridge. The inner end of the toner powder adding channel is communicated with a toner cartridge toner bin. A toner cartridge sealing cover is axially connected to the upper part of the outer end of the toner powder adding channel. A connecting channel A is arranged on one side of the inner wall of the printer shell corresponding to the other end of the toner cartridge. The inner end position of the connecting channel A corresponds to the position of the toner powder adding channel of the toner cartridge corresponding thereto so as to contact and resist.

Description

Technical Field

[0001] The invention relates to laser printing technology, in particular to a color laser printing device. Background Art

[0002] The main situation in the laser printer industry now is that for laser printers produced by foreign manufacturers, when the toner in the ink cartridge of the toner cartridge is used up, the entire toner cartridge needs to be replaced; while for domestic manufacturers, based on cost-saving considerations, when the toner is used up, the toner cartridge can be removed, the waste toner can be discharged, and then new toner can be injected into the toner cartridge. However, due to the structural limitations of the toner cartridge that can add toner in the prior art, the toner cartridge needs to be removed each time it is added. Although the toner cartridge of the laser printer is now easy to remove and install, the structure of adding toner and discharging toner is not convenient enough, and it is easy to spill toner or waste toner everywhere, polluting the environment and difficult to clean. The toner cartridge structure of some manufacturers even requires the toner cartridge shell to be removed to a certain extent before toner can be added and waste toner can be discharged. Therefore, many domestic toner cartridge sellers provide toner addition fee services. Especially for color laser printing equipment, it generally includes four toner cartridges, which contain four different colors of toner. The workload is even greater when adding toner. This will still incur certain costs for units with large color printing volumes, such as printing shops, advertising companies, and industrial and commercial departments that need to print color certificates such as anti-counterfeiting business licenses. If you replace it yourself, it is more troublesome. At the same time, if there is too much waste toner in the waste toner bin of the toner cartridge and it is not cleaned in time, it is easy to cause pollution to the inside of the printer and cause ghosting. Although the toner cartridge structure of domestic manufacturers can discharge waste toner, it is more troublesome, so it is often not cleaned in time. Summary of the invention

[0003] The purpose of the present invention is to provide a color laser printing device, which is easy to add toner and is suitable for use in situations where the color printing volume is relatively large, such as printing shops, advertising companies, and industrial and commercial departments that need to print color certificates such as anti-counterfeiting business licenses. It saves the cost of adding toner and discharging waste toner, and it is also very convenient to add toner and clean up waste toner.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0005] A color laser printing device, including a paper box at the bottom of a printer housing, a paper output board at the top, a plurality of pressure roller groups for providing power to the paper inside the printer housing, a fixing roller inside the printer housing and behind a toner cartridge working position and a pressure roller matched therewith, a slide rail inside the printer, the slide rail is slidably connected to a toner cartridge bracket, the toner cartridge is placed on the toner cartridge bracket, a motor and a transmission structure connected thereto are provided on one side of the printer housing, the transmission structure is connected to one end of the toner cartridge when the toner cartridge is in the working position, and drives the photosensitive drum, the developing roller, the charging roller, and the stirring roller in the toner cartridge to rotate, and a laser emitter in the printer housing irradiates the photosensitive drum A pressure roller cooperating with the photosensitive drum is arranged below the photosensitive drum, a toner adding channel is arranged at the other end of the toner cartridge, the inner end of the toner adding channel is communicated with the toner bin of the toner cartridge, a toner bin sealing cover is axially connected to the upper part of the outer end of the toner adding channel, and an A connecting channel is arranged on the side of the inner wall of the printer housing corresponding to the other end of the toner cartridge, the inner end position of the A connecting channel corresponds to the position of the toner adding channel of the toner cartridge corresponding to it, and its size is such that when the toner cartridge is in the working position, it can contact and resist the A connecting channel; the outer end of the A connecting channel is located outside the printer housing, and the highest point of the A connecting channel is lower than the lowest point when the corresponding toner bin sealing cover is rotated to be directly above the toner adding channel.

[0006] A waste powder discharge channel is provided at the other end of the toner cartridge, the inner end of the waste powder discharge channel is connected to the waste powder bin of the toner cartridge, the upper part of the outer end of the waste powder discharge channel is axially connected to the waste powder bin sealing cover, and a B connecting channel is provided on the side of the inner wall of the printer housing corresponding to the other end of the toner cartridge, the inner end position of the B connecting channel corresponds to the position of the waste powder discharge channel of the corresponding toner cartridge, and the size of the B connecting channel is such that when the toner cartridge is in the working position, it can contact and resist the B connecting channel; the outer end of the B connecting channel is located outside the printer housing, and the highest point of the B connecting channel is lower than the lowest point when the corresponding waste powder bin sealing cover is rotated to the top of the waste powder discharge channel.

[0007] As a preferred technical solution, a plug is detachably connected to the outer end of connecting channel A.

[0008] As a preferred technical solution, a sealing ring is provided at the inner end of connecting channel A.

[0009] As a preferred technical solution, a return protrusion is provided on the front side of the upper end of the front side of the A connecting channel. The lowest point of the return protrusion corresponding to the A connecting channel is higher than the highest point when the toner bin sealing cover seals the toner bin. The height of the return protrusion allows the upward-spinning toner bin sealing cover to spin down to seal the toner bin when the toner cartridge bracket is pulled out.

[0010] As a preferred technical solution, a sealing ring is provided at the inner end of connecting channel B.

[0011] As a preferred technical solution, a return protrusion is provided on the front side of the upper end of the front side of the B connecting channel. The lowest point of the return protrusion corresponding to the B connecting channel is higher than the highest point when the waste toner bin sealing cover seals the toner bin. The height of the return protrusion allows the upward-spinning waste toner bin sealing cover to spin down and seal the waste toner bin when the toner cartridge bracket is pulled out.

[0012] As a preferred technical solution, a spiral push rod is provided in the waste toner bin, the height of the spiral push rod is lower than the entrance of the waste toner bin, and the height of the waste toner discharge channel is lower than the entrance of the waste toner bin.

[0013] As a preferred technical solution, a waste toner collection box is detachably connected to the outer end of connecting channel B.

[0014] As a preferred technical solution, a plurality of toner cartridges are arranged in the printer housing, and the toner adding channels and waste toner discharging channels of the plurality of toner cartridges are staggered. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the present invention.

[0016] Figure 2 This is a rendering of the connection channel of the printer housing and its cooperation with a toner cartridge.

[0017] Figure 3 This is an enlarged view of point A.

[0018] Figure 4 The top view of the toner cartridge bracket.

[0019] The reference numerals are as follows:

[0020] 1-printer housing, 2-drum, 21-toner bin, 22-waste toner bin, 23-photosensitive drum, 24-seal, 25-stirring roller, 26-charging roller, 27-developing roller, 28-developing scraper, 29-scraper, 210-powder receiving sheet, 211-toner adding channel, 212-waste toner discharge channel, 213-screw push rod, 214-toner bin sealing cover. 3-laser transmitter, 4-pressure roller, 5-fixing roller, 6-slide rail, 7-drum bracket, 71-bottom plate, 72-front baffle, 73-side baffle, 74-photosensitive drum opening, 8-A connecting channel, 9-B connecting channel, 10-return protrusion, 11-sealing ring. DETAILED DESCRIPTION

[0021] The purpose of the present invention is to overcome the defects of the prior art and provide a color laser printing device. The present invention will be further described in detail below in conjunction with embodiments.

[0022] A color laser printing device has the same basic structure and principle as the one-time color laser printer in the prior art. The following briefly describes the parts that are the same as the prior art and provide technical support for this application for easy understanding.

[0023] like Figure 1 As shown, the color laser printing device includes a printer housing, the lower part of the printer housing is a paper box for placing A4 paper, the upper part is a paper output board, and a toner cartridge 2, a laser emitter 3, a fixing assembly, and a paper feeding assembly are arranged inside the printer housing 1.

[0024] The usual installation method of the toner cartridge 2 of the one-time color laser printer is to install the toner cartridge 2 on the laser printer through a drawer push-pull structure. Two slide rails 6 are correspondingly arranged on the inner wall of the printer housing, and a toner cartridge holder 7 is slidably mounted on the slide rails 6. A drawer door is arranged on the front of the printer housing. The drawer door is opened and the toner cartridge holder 7 is pulled out. Color laser printing generally includes four toner cartridges 2 containing toner of different colors. The toner cartridges 2 are sequentially installed in the four toner cartridge placement compartments of the toner cartridge holder 7, and then the toner cartridge holder 7 is pushed in and the drawer door is closed.

[0025] The toner cartridge 2 includes a toner cartridge 2 shell, which is divided into a toner bin 21 and a waste toner bin 22. The photosensitive drum 23 is mounted on the toner cartridge 2 shell and is located between the toner bin 21 and the waste toner bin 22. A developing roller 27 (also called a magnetic roller) is provided at the outlet of the toner bin 21. A developing scraper 28 is connected to the outlet of the toner bin 21. The tip of the developing scraper 28 contacts the developing roller 27 and is located at the tangent of the developing roller 27. A seal 24 is also provided between the photosensitive drum 23 and the toner bin 21. One end of the seal 24 extends out of the toner cartridge 2 shell for easy pulling. New toner cartridges 2 all have the seal 24. When in use, the seal 24 is removed so that the toner in the toner bin 21 can contact the developing roller 27. A stirring roller 25 is also provided in the toner bin 21. The laser emitter in the printer housing irradiates the photosensitive drum.

[0026] A charging roller 26 is rotatably provided on the upper part of the shell of the toner cartridge 2. The charging roller 26 is tangential to the photosensitive drum 23. A tangential pressure roller 4 is provided just below the photosensitive drum 23. A4 paper passes between the photosensitive drum 23 and the pressure roller 4.

[0027] The waste toner bin 22 is provided with an opening, and a scraper 29 and a powder receiving sheet 210 are respectively provided at the upper and lower ends of the opening. Both the scraper 29 and the powder receiving sheet 210 are tangent to the photosensitive drum 23 , and an entrance to the waste toner bin 22 is formed between the scraper 29 and the powder receiving sheet 210 .

[0028] A transmission end is provided at one end outside the toner cartridge 2 shell, and the transmission end is connected to the photosensitive drum shaft core in the toner cartridge 2 shell. The photosensitive drum shaft core is connected to the developing roller shaft core, the charging roller shaft core, and the stirring roller shaft core through transmission structures such as gears.

[0029] A motor and a contact conductive column are provided in the shell wall on one side of the printer shell. One end of the above-mentioned motor is connected to a transmission device. When the motor is not working, the transmission device is located in the printer shell wall. When the motor is working, the structure of the transmission device allows the motor to extend forward a section (extend out of the printer shell wall) when it rotates in a set direction, and after engaging with the transmission end at one end of the shell of the toner cartridge 2, the photosensitive drum 23, the charging roller 26, the developing roller 27, and the stirring roller 25 in the entire toner cartridge 2 are driven to rotate. One of the prior art structures is provided for reference: CN201720532590.1. The contact conductive column is in contact communication with the conductive end at one end of the installed toner cartridge 2 shell, and the conductive end is directly connected to the charging roller shaft core in a rotatable manner, so that the charging roller 26 is charged, and the charging roller 26 charges the photosensitive drum 23.

[0030] Of course, inside the printer housing, behind the working positions of the four toner cartridges 2, there is a fixing roller 5 and a pressure roller 4 cooperating therewith. The fixing roller 5 has a heating function for fixing. There are also several groups of pressure rollers 4 inside the printer housing to provide power for the movement of A4 paper.

[0031] The improvements of this embodiment are described below:

[0032] The purpose of this embodiment is to enable toner to be added directly from outside the printer. It has a simple structure and is easy to operate. Anyone can do it easily without having to find someone specifically to perform the toner adding operation. The structure is also very simple.

[0033] like Figures 1 to 3 As shown, in this embodiment, a toner adding channel 211 and a waste toner discharging channel 212 are provided at the other end of the toner cartridge 2 shell (i.e., corresponding to the end where the transmission end and the conductive end are located). The toner adding channel 211 and the waste toner discharging channel 212 are overall short and convex relative to the other end of the toner cartridge 2.

[0034] The inner end of the toner adding channel 211 is connected to the toner bin 21, and the outer end is provided with a toner bin sealing cover 214. The upper part of the toner bin sealing cover 214 is connected to the upper axis of the toner adding channel 211. A sealing ring 11 is provided at the corresponding position between the toner bin sealing cover 214 and the toner adding channel 211. The toner bin sealing cover 214 and the toner adding channel 211 are tightly coupled to the axis, that is, external force needs to be applied to rotate it to open it, so that the toner adding channel 211 is opened.

[0035] The inner end of the waste powder discharge channel 212 is connected to the toner bin 21, and the outer end is provided with a waste powder bin 22 sealing cover. The upper part of the waste powder bin 22 sealing cover is connected to the upper axis of the waste powder discharge channel 212. A sealing ring 11 is provided at the corresponding position between the waste powder bin 22 sealing cover and the waste powder discharge channel 212. The waste powder bin 22 sealing cover and the waste powder discharge channel 212 axis are tightly connected, that is, external force needs to be applied to rotate it to open it, so that the waste powder discharge channel 212 is opened.

[0036] In this embodiment, a connecting channel is further provided on the inner wall of the printer to correspond to the toner adding channel 211 and the waste toner discharging channel 212. One section of the connecting channel is located outside the printer housing, and the other end is protruding and located inside the printer. A sealing ring 11 is provided at one end of the connecting channel located inside the printer. The structure of the sealing ring 11 is that the outer edge of the sealing ring 11 has a sealing protrusion. In this embodiment, for the convenience of subsequent description, the connecting channel corresponding to the toner adding channel 211 is defined as the A connecting channel 8, and the connecting channel corresponding to the waste toner discharging channel 212 is defined as the B connecting channel 9.

[0037] This embodiment is a color laser printer, which has four toner cartridges 2 by default. Therefore, there should be four A connection channels 8 and four B connection channels 9, and these eight connection channels are staggered. (The printer position where the drawer door is located is the front side) A return protrusion 10 is provided on the upper front side of each connection channel on the inner wall of the printer housing. The connection channels corresponding to the toner adding channel 211 and the waste toner discharge channel 212 on each toner cartridge 2 should all meet the requirements. The size of the connection channel should just be able to resist the corresponding toner adding channel 211 and the waste toner discharge channel 212. Therefore, inevitably, when the toner cartridge 2 is installed on the toner cartridge bracket 7 and pushed inward, the connection channel will hinder the toner bin sealing cover 214 and the waste toner bin 22 sealing cover at the outer end of the corresponding toner adding channel 211 or the waste toner discharge channel 212.

[0038] The lowest point of the return protrusion 10 is slightly higher than the highest point when the waste powder bin 22 sealing cover or the toner bin sealing cover 214 seals the waste powder bin 22 and the toner bin 21, so that the return protrusion 10 does not affect the inner push. The highest point of the connecting channel is lower than the lowest point when the corresponding toner bin sealing cover 214 or the waste powder bin 22 sealing cover is rotated to the corresponding toner adding channel 211 and the waste powder discharging channel 212.

[0039] In this embodiment, the function of the connecting channel is that after the toner cartridge 2 is installed, when the toner cartridge bracket 7 is pushed inward, the connecting channel blocks the sealing cover of the waste powder bin 22 or the sealing cover of the toner bin 214, so that it is subjected to the thrust of the connecting channel and rotates upward, so that the connecting channel is docked with the corresponding toner adding channel 211 or waste powder discharging channel 212. When taking out the toner cartridge 2, the toner cartridge bracket 7 is pulled outward (at this time, the waste powder bin 22 sealing cover is above the waste powder discharge channel 212, and the toner powder bin sealing cover 214 is above the toner adding channel 211). When pulling outward, the waste powder bin 22 sealing cover and the waste powder bin 22 sealing cover will pass through the return protrusion 10 above the front side of the corresponding connecting channel, and at this time the position of the return protrusion 10 corresponds to the waste powder bin 22 sealing cover and the toner powder bin sealing cover 214. Therefore, in the process of pulling out the toner cartridge bracket 7, under the action of the return protrusion 10, the waste powder bin 22 sealing cover is screwed down to cover the waste powder discharge channel 212, and the toner powder bin sealing cover 214 is screwed down to cover the toner adding channel 211.

[0040] Furthermore, in order to help the waste powder bin 22 discharge the waste powder, a spiral push rod 213 is rotatably provided in the waste powder bin 22, and the spiral push rod 213 is also connected to the above-mentioned photosensitive drum 23 core shaft through a gear transmission structure, so that the rotation of the photosensitive drum 23 core shaft drives the spiral push rod 213 to rotate. Since the above-mentioned waste powder bin 22 entrance is provided on the waste powder bin 22, in order to prevent the spiral push rod 213 from rotating so that the waste powder is discharged from the waste powder bin 22 entrance, it is necessary to meet the requirements that the highest point of the spiral push rod 213 is lower than the waste powder bin 22 entrance, and the above-mentioned waste powder discharge channel 212 is lower than the waste powder bin 22 entrance, so that the waste powder can be ensured to be discharged from the waste powder discharge channel 212.

[0041] In this embodiment, the reasons why the waste powder discharge channel 212 and the toner adding channel 211 are staggered are as follows (this embodiment is only described with respect to the toner adding channel 211, and the principle of the waste powder discharge channel 212 is the same as that of the toner adding channel 211. For the sake of convenience, the toner cartridge 2 is defined as No. 1 toner cartridge 2 to No. 4 toner cartridge 2, and the No. 1 toner cartridge 2 and the No. 4 toner cartridge 2 are located at the front and rear sides respectively, and then the corresponding toner adding channels 211 to 211, the No. 1 toner bin sealing cover 214 to the No. 4 toner bin sealing cover 214, the No. 1 A connecting channel 8 to the No. 4 A connecting channel 8, and the No. 1 return protrusion 10 to the No. 4 return protrusion 10):

[0042] After the toner cartridge 2 is installed on the toner cartridge bracket 7, when the toner cartridge 2 is pushed inward, the toner cartridge 2 passes through the connecting channel, and after the connecting channel pushes open the corresponding toner bin 21 cover or the waste toner bin 22 cover on the toner cartridge 2, the toner cartridge 2 is just relatively close to the toner adding channel 211 or the waste toner discharge channel 212. If they are not misaligned, the No. 4 toner cartridge 2 located at the innermost side of the toner cartridge bracket 7 will have the No. 4 toner bin sealing cover 214 pass through the No. 1 to No. 4 A connecting channels 8 in sequence during the process of the toner cartridge bracket 7 being pushed into the printer to its working position. Then, the No. 4 toner bin sealing cover 214 will be pushed up by the No. 1 A connecting channel 8, rotated downward by the No. 2 return protrusion 10, pushed up and down by the No. 2 A connecting channel 8, rotated downward by the No. 3 return protrusion 10... in sequence until it is lifted up by the No. 4 A connecting channel 8. That is, the closer the toner cartridge 2 is to the inside, the more times its corresponding toner powder bin sealing cover 214 is opened. Therefore, in order to avoid the toner powder bin sealing cover 214 being opened, resulting in toner leakage, they should be staggered so that they do not affect each other. When the toner cartridge 2 is in the working position, the toner powder bin sealing cover 214 will only be pushed open by its corresponding A connecting channel 8.

[0043] The working principle of this embodiment is as follows:

[0044] When using a new toner cartridge 2, tear off the sealing strip 24 on the toner cartridge 2, then place the toner cartridge 2 on the toner cartridge holder 7 in turn, and push it into the printer. During the pushing process, the toner bin sealing covers 214 and the waste toner bin 22 sealing covers on the four toner cartridges 2 are pushed open by the corresponding connecting channels in the printer in turn, and the toner adding channel 211 and the waste toner discharging channel 212 are in contact with and connected to the connecting channels. Since one end of the connecting channel is located outside the printer, toner can be added directly from the outside of the printer through a syringe or other equipment (in actual production, each connecting channel should be marked on the printer housing 1 to indicate which toner cartridge 2 it corresponds to, whether it is the A connecting channel 8 or the B connecting channel 9. At the same time, in actual production, the outer end of the A connecting channel 8 corresponding to the toner bin 21 adding channel outside the printer housing 1 is also equipped with a plug, and the plug is used to plug it when no toner is added).

[0045] Moreover, in the structure of this embodiment, a spiral push rod 213 is provided in the waste powder bin 22 to rotate with the photosensitive drum 23. Therefore, when waste powder is generated during the printing process, the waste powder bin 22 can also discharge the waste powder, ensuring that the amount of waste powder in the waste powder bin 22 is at a relatively low level, solving the problem of internal printing pollution and ghosting caused by too much waste powder in the prior art and not being cleaned up in time. In order to achieve this technical effect, as a preferred method, a detachable waste powder collection box is provided at the B connection channel 9 outside the printer housing. Normally, the waste powder collection box is installed on the B connection channel 9 to collect the discharged waste powder at any time, and the user can also conveniently remove the waste powder collection box at any time to pour out the collected waste powder. As a preferred method, the structure of the waste powder collection box can be provided with a socket on the upper part of one side, and the connection is achieved by inserting the B connection channel 9 into the socket. The structure is simple and easy to disassemble.

[0046] In the prior art, the top view of the toner cartridge support 7 is as follows: Figure 4 As shown, the bottom plate 71 includes a plurality of front baffles 72 and a plurality of side baffles 73 which divide the bottom plate 71 into four drum placement grids. Each drum placement grid corresponds to a photosensitive drum opening 74 on the bottom plate 71 for the photosensitive drum 23 to pass through and contact the pressure roller 4 at the bottom of the bracket. In practice, the drum bracket 7 only needs to be able to cooperate with the drum 2. In order to better achieve the effects of waste toner discharge and toner addition in this embodiment, the side baffles 73 should be relatively low in height, slightly higher than the bottom plate 71, so that they do not hinder the protrusion of the toner discharge channel and the toner addition channel 211, as shown in FIG. Figure 3 shown. Figure 3 In the figure, the front baffle blocks the waste toner discharge passage 212 from view, so the waste toner discharge passage 212 is not visible.

[0047] It is worth noting that, based on the above structural design, in order to solve the same technical problem, even if some insubstantial changes or modifications are made to the present invention, the essence of the technical solution adopted is still the same as the present invention, so it should also be within the protection scope of the present invention.

Claims

1. A color laser printing device, comprising a paper box at the lower part of a printer housing, a paper board at the upper part, a plurality of pressure roller groups for providing power to the paper inside the printer housing, a fixing roller inside the printer housing and behind the toner cartridge working position and a pressure roller matched therewith, a slide rail inside the printer, the slide rail is slidably connected to a toner cartridge bracket, the toner cartridge is placed on the toner cartridge bracket, a motor and a transmission structure connected thereto are provided on one side of the printer housing, the transmission structure is connected to one end of the toner cartridge when the toner cartridge is in the working position, and drives the photosensitive drum, the developing roller, the charging roller, and the stirring roller in the toner cartridge to rotate, the laser emitter in the printer housing irradiates the photosensitive drum, and a pressure roller matched therewith is provided below the photosensitive drum, characterized in that: A toner adding channel is provided at the other end of the toner cartridge, the inner end of the toner adding channel is communicated with the toner bin of the toner cartridge, the upper part of the outer end of the toner adding channel is axially connected with a toner bin sealing cover, and an A connecting channel is provided on the side of the inner wall of the printer housing corresponding to the other end of the toner cartridge, the inner end position of the A connecting channel corresponds to the position of the toner adding channel of the toner cartridge corresponding to it, and the size of the A connecting channel is such that when the toner cartridge is in the working position, it can contact and resist the A connecting channel; the outer end of the A connecting channel is located outside the printer housing, and the highest point of the A connecting channel is lower than the lowest point when the corresponding toner bin sealing cover is rotated to be just above the toner adding channel; A waste powder discharge channel is provided at the other end of the toner cartridge, the inner end of the waste powder discharge channel is communicated with the waste powder bin of the toner cartridge, the upper part of the outer end of the waste powder discharge channel is axially connected with a waste powder bin sealing cover, a B connection channel is provided at the side of the inner wall of the printer housing corresponding to the other end of the toner cartridge, the position of the inner end of the B connection channel corresponds to the position of the waste powder discharge channel of the toner cartridge corresponding to it, and its size is such that when the toner cartridge is in the working position, it can contact and resist the B connection channel; the outer end of the B connection channel is located outside the printer housing, and the highest point of the B connection channel is lower than the lowest point when the corresponding waste powder bin sealing cover is rotated to be directly above the waste powder discharge channel; A return protrusion is provided at the front side of the upper end of the front side of the B connecting channel. The lowest point of the return protrusion corresponding to the B connecting channel is higher than the highest point when the waste toner bin sealing cover seals the toner bin. The height of the return protrusion enables the waste toner bin sealing cover that is rotated upward to rotate downward to seal the waste toner bin when the toner cartridge bracket is pulled outward. A spiral push rod is arranged in the waste toner bin, the height of the spiral push rod is lower than the entrance of the waste toner bin, and the height of the waste toner discharge channel is lower than the entrance of the waste toner bin.

2. A color laser printing device according to claim 1, characterized in that: A plug is detachably connected to the outer end of the connecting channel.

3. A color laser printing device according to claim 1, characterized in that: A sealing ring is provided at the inner end of the connecting channel.

4. A color laser printing device according to claim 1, characterized in that: A return protrusion is provided on the front side of the upper end of the front side of the A connecting channel. The lowest point of the return protrusion corresponding to the A connecting channel is higher than the highest point when the toner bin sealing cover seals the toner bin. The height of the return protrusion allows the upwardly rotated toner bin sealing cover to rotate downward to seal the toner bin when the toner cartridge bracket is pulled outward.

5. A color laser printing device according to claim 4, characterized in that: A sealing ring is provided at the inner end of connecting channel B.

6. A color laser printing device according to claim 5, characterized in that: A waste toner collection box is detachably connected to the outer end of the B connecting channel.

7. A color laser printing device according to claim 6, characterized in that: A plurality of toner cartridges are arranged in the printer housing, and toner adding channels and waste toner discharging channels of the plurality of toner cartridges are staggered.

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