Drum assembly for printing equipment

Abstract

The present invention belongs to the technical field of printing equipment, and in particular to a drum assembly for printing equipment. The following scheme is proposed, which specifically includes a fixed bracket, a toner cartridge is arranged on the side of the fixed bracket, and a toner adding port is arranged on the top of the toner cartridge. A charging roller, a photosensitive drum and a developing roller are rotatably installed in the fixed bracket in sequence, and the developing roller is located at the bottom of the toner cartridge. A transmission member that rotates synchronously with the photosensitive drum is arranged at the end of the charging roller, and a protective cover is fixed at the top of the fixed bracket. In the present invention, the recovered toner is filtered by a toner recovery mechanism, and the recovered toner is added to the toner cartridge again to complete the toner recovery and reuse operation, and the toner thickness at the developing roller and toner conveying roller is monitored by a powder quantity monitoring sensor, thereby monitoring the toner content, accurately controlling the toner content, and effectively reducing the waste of toner.

Description

Technical Field

[0001] The present invention relates to the technical field of printing equipment, and in particular to a drum set component for printing equipment. Background Art

[0002] Laser printers are a new product of high-tech development. They provide us with a higher quality, faster and lower cost printing method. The toner cartridge is a very important component in the laser printer. The quality of the toner cartridge affects the quality of printing, and the life of the toner cartridge affects the printing cost. The toner cartridge is pre-charged. When light is irradiated, the irradiated part will react with resistance. The data signal sent controls the emission of the laser. The light scanning on the surface of the toner cartridge changes continuously, so that some places are irradiated, the resistance becomes smaller, and the charge disappears. Some places are not irradiated by light and still retain the charge. Finally, the surface of the toner cartridge forms a latent image composed of charges. While the toner cartridge rotates during work, the printing system transmits the printing paper, and the printing paper carries the same polarity as the surface of the toner cartridge, but much stronger. Then the paper passes through the toner cartridge with toner, and the toner on the surface of the toner cartridge is attracted to the printing paper, and the image is formed on the surface of the paper.

[0003] At this time, the toner and the printing paper are only combined by the attraction of the electric charge. Before the printing paper is sent out of the printer, the toner is melted by high temperature heating and solidified on the surface of the paper during the cooling process. After the toner is attached to the printing paper, the surface of the drum continues to rotate, and passes through a cleaner to remove the remaining toner so as to enter the next printing cycle. The fallen toner is collected in the waste bin. Different patterns generate different amounts of waste toner. The traditional method of measuring the remaining content in the ink cartridge by calculating the number of printed pages makes it impossible to control the amount of toner in the ink cartridge, and the waste toner generated is not recycled, affecting the efficiency of toner utilization.

[0004] In view of this, the present invention provides a drum assembly for a printing device to solve the technical problems existing in the above-mentioned prior art. Summary of the invention

[0005] Based on the technical problems existing in the background technology, the present invention proposes a drum assembly for a printing device.

[0006] The present invention provides a drum assembly for a printing device, comprising a fixed bracket, a toner cartridge is arranged on the side of the fixed bracket, and a toner adding port is arranged on the top of the toner cartridge, a charging roller, a photosensitive drum and a developing roller are rotatably mounted in sequence inside the fixed bracket, and the developing roller is located at the bottom of the toner cartridge, a transmission member that rotates synchronously with the photosensitive drum is arranged at the end of the charging roller, a protective cover is fixed at the top of the fixed bracket, a toner conveying roller is also arranged at the bottom of the toner cartridge, and a gear group that is linked is arranged between the toner conveying roller and the end of the developing roller, a developing scraper that cooperates with the surface of the developing roller is also arranged at the bottom of the toner cartridge, a powder amount monitoring sensor is arranged on the top of the toner cartridge, and the bottom of the powder amount monitoring sensor is located at the connection position of the developing roller and the toner conveying roller, and a laser emitting module that cooperates with the photosensitive drum is also arranged inside the fixed bracket;

[0007] A cleaning scraper mechanism is arranged on the other side of the fixed bracket, and the cleaning scraper mechanism is located on the side of the photosensitive drum, and a toner recovery mechanism is arranged on the upper position of the fixed bracket, a conveying pipe is installed between the ends of the cleaning scraper mechanism and the toner recovery mechanism, a recovery flow channel connected to the toner box is arranged on the side of the toner recovery mechanism, and a movable isolation plate is arranged inside the recovery flow channel, and a fixing mechanism is also arranged on the other side of the fixed bracket.

[0008] Preferably in the present invention, a plurality of elastic vibrating plates are disposed at the front end of the developing scraper, and an elastic column is disposed at the top of the elastic vibrating plates.

[0009] Preferably in the present invention, the cleaning scraper mechanism includes a cleaning shell, a rotating rod is rotatably installed inside the cleaning shell, and a motor for driving the rotating rod to rotate is installed at one end of the cleaning shell, pushing blades arranged in opposite spiral directions are arranged at both ends of the rotating rod, and a scraper assembly that is in contact with the surface of the photosensitive drum is arranged at the opening of the cleaning shell.

[0010] Preferably in the present invention, the scraper assembly includes a positioning part fixedly installed inside the cleaning shell, and a movable part slidably installed at the opening of the cleaning shell, the positioning part and the movable part are connected by a spring, a scraper part is arranged above the front end of the movable part, and an inclined guide part is arranged below the front end of the movable part.

[0011] Preferably in the present invention, symmetrically distributed collecting pipes are provided at both ends of the cleaning shell, and the collecting pipes are composed of a plurality of short tubes with a trumpet-shaped structure, and a C-shaped notch is provided between each short tube.

[0012] Preferably in the present invention, the toner recovery mechanism includes a recovery shell and a movable cover, a dispersion pipe is installed in the middle position of the bottom of the movable cover, and a two-way conveying auger is rotatably installed inside the dispersion pipe, an auxiliary motor for driving the two-way conveying auger to rotate is installed at the end of the dispersion pipe, and a plurality of discharge troughs are arranged at the bottom of the dispersion pipe.

[0013] Preferably in the present invention, the toner recovery mechanism further comprises a sieve plate snap-connected to the bottom of the movable cover, and a plurality of vibration springs are installed in the middle of the sieve plate, and the discharge slots are evenly distributed above the vibration springs.

[0014] Preferably in the present invention, the vibration spring is composed of a spiral spring leaf, and the outer end of the spring leaf is fixed to the screen plate, and the inner end of the spring leaf is equipped with a connecting bolt, which passes through one of the discharge slots and contacts the bidirectional conveying auger.

[0015] Preferably in the present invention, the fixing mechanism comprises a fixing housing, and two heaters arranged in a C-shaped structure are fixedly mounted on the bottom of the fixing housing, and a fixing roller is mounted between the two heaters.

[0016] In the present invention, preferably, an installation groove is provided inside the fixing shell, and a dust collecting hood is plugged in and connected inside the installation groove, a scraper in contact with the surface of the fixing roller is provided at the bottom of the dust collecting hood, an electrostatic rod is installed inside the dust collecting hood, and a plurality of dust collecting screens are provided at the bottom of the electrostatic rod.

[0017] Compared with the prior art, the present invention provides a drum assembly for a printing device, which has the following beneficial effects:

[0018] In the present invention, the toner in the toner cartridge is fully diffused on the surface of the developing roller under the action of the toner conveying roller, and then quickly and evenly covers the outer surface of the developing roller. The thickness of the toner attached to the surface of the developing roller is controlled by the developing scraper. The photosensitive drum absorbs the toner on the surface of the developing roller. After the toner on the surface of the photosensitive drum is attracted by the printing paper by the electric charge, the residual toner on the surface of the photosensitive drum is cleaned by the cleaning scraper mechanism. The cleaned toner moves to both ends in the cleaning scraper mechanism and is squeezed in from the lower end of the conveying pipe. At the same time, the toner recovery mechanism located above generates vacuum suction, and the toner located at the end of the cleaning scraper mechanism is sucked in through the conveying pipe and is collected in the toner recovery mechanism. The toner is diffused internally, and the recovered toner is filtered through the toner recovery mechanism, and the recovered toner is replenished into the toner cartridge again to complete the toner recycling and reuse operation. The toner thickness at the developing roller and the toner conveying roller is monitored by the powder quantity monitoring sensor, and the toner content is monitored and accurately controlled to effectively reduce the waste of toner. The functional integration of the toner cartridge is realized through the structure, and the functional structural components of the fixing are arranged in parallel to the developing structure of the toner cartridge. The fixing mechanism directly shapes the toner after it adheres to the surface of the printing paper, and directly fixes it after development, so that the original toner cartridge assembly has diverse functionality, which improves the volume of the printing equipment and the printing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic structural diagram of a drum assembly for a printing device proposed by the present invention;

[0020] Figure 2 A cross-sectional structural schematic diagram of a drum set assembly for a printing device proposed by the present invention;

[0021] Figure 3 A schematic diagram of the distribution structure of a conveying pipe of a drum assembly for a printing device proposed by the present invention;

[0022] Figure 4 A schematic diagram of the structure of a fixing mechanism of a drum assembly for a printing device proposed by the present invention;

[0023] Figure 5 A schematic diagram of the structure of a cleaning scraper mechanism for a drum assembly of a printing device proposed by the present invention;

[0024] Figure 6 A schematic diagram of the structure of movable parts of a drum assembly for a printing device proposed by the present invention;

[0025] Figure 7 A partially enlarged structural schematic diagram of a cleaning scraper mechanism of a drum assembly for a printing device proposed by the present invention;

[0026] Figure 8A schematic diagram of the structure of a toner recovery mechanism of a drum assembly for a printing device proposed by the present invention;

[0027] Fig. 9 A schematic diagram of the structure of a vibration spring of a drum assembly for a printing device proposed by the present invention;

[0028] Fig.10 The present invention is a schematic diagram of a vibration spring distribution structure of a drum assembly for a printing device.

[0029] In the figure: 1 fixed bracket, 2 toner cartridge, 3 powder quantity monitoring sensor, 4 gear set, 5 photosensitive drum, 6 transmission part, 7 toner adding port, 8 protective cover, 9 fixing mechanism, 91 fixing shell, 92 heater, 93 fixing roller, 94 dust collecting screen, 95 electrostatic rod, 96 dust collecting cover, 10 charging roller, 11 laser emission module, 12 toner recovery mechanism, 121 recovery shell, 122 movable cover, 123 two-way conveying auger, 124 vibration spring, 125 dispersion pipe, 126 screen plate, 13 developing scraper, 14 toner conveying roller, 15 developing roller, 16 cleaning scraper mechanism, 161 cleaning shell, 162 rotating rod, 163 pushing paddle, 164 positioning part, 165 movable part, 166 scraper part, 167 guide part, 168 collection pipe, 169 motor, 17 conveying pipe. DETAILED DESCRIPTION

[0030] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0031] Reference Figure 1-10 , a drum assembly for a printing device, comprising a fixed bracket 1, a toner cartridge 2 is arranged on the side of the fixed bracket 1, and a toner adding port 7 is arranged on the top of the toner cartridge 2, a charging roller 10, a photosensitive drum 5 and a developing roller 15 are rotatably installed in sequence inside the fixed bracket 1, and the developing roller 15 is located at the bottom of the toner cartridge 2, and a transmission member 6 that rotates synchronously with the photosensitive drum 5 is arranged at the end of the charging roller 10, a protective cover 8 is fixed at the top of the fixed bracket 1, a toner conveying roller 14 is also installed at the bottom of the toner cartridge 2, and a gear group 4 that is linked is arranged between the toner conveying roller 14 and the end of the developing roller 15, a developing scraper 13 that cooperates with the surface of the developing roller 15 is also installed at the bottom of the toner cartridge 2, a powder amount monitoring sensor 3 is installed on the top of the toner cartridge 2, and the bottom of the powder amount monitoring sensor 3 is located at the connection position of the developing roller 15 and the toner conveying roller 14, and a laser emitting module 11 that cooperates with the photosensitive drum 5 is also installed inside the fixed bracket 1;

[0032] A cleaning scraper mechanism 16 is provided on the other side of the fixed bracket 1, and the cleaning scraper mechanism 16 is located on the side of the photosensitive drum 5, and a toner recovery mechanism 12 is provided above the fixed bracket 1, and a conveying pipe 17 is installed between the ends of the cleaning scraper mechanism 16 and the toner recovery mechanism 12, and a recovery flow channel connected to the toner cartridge 2 is provided on the side of the toner recovery mechanism 12, and a movable isolation plate is provided inside the recovery flow channel, and a fixing mechanism 9 is also provided on the other side of the fixed bracket 1.

[0033] In the present invention, the toner in the toner cartridge 2 is fully diffused on the surface of the developing roller 15 under the action of the toner conveying roller 14, and then quickly and evenly covers the outer surface of the developing roller 15. The thickness of the toner attached to the surface of the developing roller 15 is controlled by the developing scraper 13. The photosensitive drum 5 absorbs the toner on the surface of the developing roller 15. After the toner on the surface of the photosensitive drum 5 is attracted by the printing paper by the electric charge, the residual toner on the surface of the photosensitive drum 5 is cleaned by the cleaning scraper mechanism 16. The cleaned toner moves to both ends in the cleaning scraper mechanism 16 and is squeezed out from the lower end of the conveying pipe 17. At the same time, the toner recovery mechanism 12 located above generates vacuum suction, and the toner located at the end of the cleaning scraper mechanism 16 is sucked in through the conveying pipe 17, and diffused in the toner recovery mechanism 12, and the recovered toner is filtered by the toner recovery mechanism 12, and the recovered toner is replenished into the toner box 2 again, completing the toner recovery and reuse operation, and the toner thickness at the position of the developing roller 15 and the toner conveying roller 14 is monitored by the powder amount monitoring sensor 3, and then the toner content is monitored, the toner content is accurately controlled, and the waste of toner is effectively reduced.

[0034] As a further solution in the present invention, a plurality of elastic vibrators are provided at the front end of the developing scraper 13, and an elastic column is provided on the top of the elastic vibrator. In the present invention, the developing scraper 13 is used to control the thickness of the toner on the surface of the developing roller 15. When scraping the surface of the developing roller 15, the elastic vibrator is driven to vibrate, and the elastic vibrator and the elastic column are immersed in the toner, thereby driving the toner to move, dispersing the toner in the toner box 2, and vibrating and breaking up the recovered toner to avoid toner accumulation.

[0035] As a further solution in the present invention, the cleaning scraper mechanism 16 includes a cleaning shell 161, a rotating rod 162 is rotatably installed inside the cleaning shell 161, and a motor 169 for driving the rotating rod 162 to rotate is installed at one end of the cleaning shell 161, and pushing blades 163 arranged in opposite spiral directions are arranged at both ends of the rotating rod 162, and a scraper assembly that is in contact with the surface of the photosensitive drum 5 is arranged at the opening of the cleaning shell 161. In the present invention, the scraper assembly cleans the toner on the surface of the photosensitive drum 5 and collects the toner into the interior of the cleaning shell 161. The interior of the cleaning shell 161 is provided with a rotating rod 162 and a pushing paddle 163 that can rotate, and the pushing paddle 163 is symmetrically distributed at the two end positions of the rotating rod 162, thereby pushing the toner inside the cleaning shell 161 from the middle to the two ends, and squeezing it into the pipe mouth position of the conveying pipe 17, completing the toner collection and transfer operation, and avoiding the accumulation of toner causing the cleaning effect of the photosensitive drum 5 to decrease.

[0036] As a further solution in the present invention, the scraper assembly includes a positioning member 164 fixedly installed inside the cleaning shell 161, and a movable member 165 slidably installed at the opening of the cleaning shell 161. The positioning member 164 and the movable member 165 are connected by a spring. A scraper portion 166 is arranged above the front end of the movable member 165, and an inclined guide portion 167 is arranged below the front end of the movable member 165. In the present invention, the scraper portion 166 at the front end of the movable member 165 is frictionally connected with the surface of the photosensitive drum 5, and vibrates while cleaning the surface of the photosensitive drum 5. The guide portion 167 receives the scraped toner and guides it for recovery, thereby avoiding toner falling and accumulation, improving toner recovery efficiency, and enhancing the cleaning effect on the surface of the photosensitive drum 5.

[0037] As a further solution in the present invention, symmetrically distributed collecting pipes 168 are provided at both ends of the cleaning shell 161, and the collecting pipe 168 is composed of multiple sections of short tubes with a trumpet-shaped structure, and a C-shaped notch is provided between each short tube. In the present invention, the pushing paddle 163 rotates inside the collecting pipe 168, and the toner enters the collecting pipe 168 through the notch, and is continuously pushed and moved in the multiple sections of the trumpet-shaped cavity to prevent the toner from escaping from the cleaning shell 161 again. At the same time, the toner is pushed and moved to the two ends of the cleaning shell 161 to speed up the toner transfer speed.

[0038] As a further solution in the present invention, the toner recovery mechanism 12 includes a recovery shell 121 and a movable cover 122, a dispersion pipe 125 is installed in the middle position of the bottom of the movable cover 122, and a two-way conveying auger 123 is rotatably installed inside the dispersion pipe 125, and a sub-motor for driving the two-way conveying auger 123 to rotate is installed at the end of the dispersion pipe 125, and a plurality of discharge troughs are arranged at the bottom of the dispersion pipe 125. In the present invention, the two-way conveying auger 123 rotates in the dispersion pipe 125, and as the toner in the toner cartridge 2 is consumed, suction is generated between the dispersion pipe 125 and the conveying pipe 17, so that the toner in the cleaning scraper mechanism 16 is sucked and recovered. At the same time, the toner moves synchronously from the two ends of the dispersion pipe 125 to the middle, and is dispersed and transferred through the discharge trough, so as to avoid the accumulation of recovered toner and reduce printing costs.

[0039] As a further solution in the present invention, the toner recovery mechanism 12 also includes a sieve plate 126 that is clamped to the bottom of the movable cover 122, and a plurality of vibration springs 124 are installed in the middle of the sieve plate 126, and the discharge troughs are evenly distributed above the vibration springs 124. In the present invention, the vibration springs 124 vibrate under the action of the bidirectional conveying auger 123, and drive the sieve plate 126 to vibrate, and the toner dropped in the discharge trough comes into contact with the vibrating vibration springs 124, breaking up the toner, and the toner particles pass through the holes of the sieve plate 126, while the paper fiber particles are intercepted, thereby preventing the dust or fibers on the paper surface contaminated by the photosensitive drum 5 from affecting the printing effect.

[0040] As a further solution in the present invention, the vibration spring 124 is composed of a spiral spring leaf, and the outer end of the spring leaf is fixed to the screen plate 126, and the inner end of the spring leaf is installed with a connecting bolt, which passes through one of the discharge grooves and contacts the two-way conveying auger 123. In the present invention, when the two-way conveying auger 123 rotates, it contacts the connecting bolt and generates a lateral thrust to it. When the contact point between the two-way conveying auger 123 and the connecting bolt is deflected, the connecting bolt is separated from the two-way conveying auger 123, and the spring leaf rebounds to generate vibration. When the spring leaf vibrates, it contacts the toner and impurities, generates different thrusts to the toner and impurities, speeds up the separation between the toner and impurities, and improves the toner recovery efficiency.

[0041] As a further solution in the present invention, the fixing mechanism 9 includes a fixing shell 91, and two heaters 92 with a C-shaped structure are fixedly installed at the bottom of the fixing shell 91, and a fixing roller 93 is installed between the two heaters 92. In the present invention, the fixing roller 93 is heated to a high temperature by the heater 92. At the same time, the two heaters 92 with a C-shaped structure form a baking area below. When the printing paper passes through the fixing roller 93, the toner is melted and fixed, thereby providing printing efficiency.

[0042] As a further solution in the present invention, a mounting groove is provided inside the fixing shell 91, and a dust collecting cover 96 is plugged and connected inside the mounting groove, a scraper in contact with the surface of the fixing roller 93 is provided at the bottom of the dust collecting cover 96, an electrostatic rod 95 is installed inside the dust collecting cover 96, and a plurality of dust collecting screens 94 are provided at the bottom of the electrostatic rod 95. In the present invention, the fixing roller 93 contacts with the toner to bake and fix it, and at the same time, when the fixing roller 93 rotates, the scraper cleans the surface of the fixing roller 93, scrapes out the adhered toner, and relies on the electrostatic adsorption of the electrostatic rod 95 and the dust collecting screen 94, and regularly cleans to prevent the fixing roller 93 from being contaminated.

[0043] When in use, the toner in the toner cartridge 2 is fully diffused on the surface of the developing roller 15 under the action of the toner conveying roller 14, and then quickly and evenly covers the outer surface of the developing roller 15. The thickness of the toner attached to the surface of the developing roller 15 is controlled by the developing scraper 13. The photosensitive drum 5 absorbs the toner on the surface of the developing roller 15. After the toner on the surface of the photosensitive drum 5 is attracted by the printing paper by the electric charge, the residual toner on the surface of the photosensitive drum 5 is cleaned by the cleaning scraper mechanism 16. The cleaned toner moves to both ends in the cleaning scraper mechanism 16 and is squeezed in from the lower end of the conveying pipe 17. At the same time, the toner recovery mechanism located above The action of 12 generates vacuum suction, which sucks the toner located at the end of the cleaning scraper mechanism 16 through the conveying pipe 17 and diffuses it inside the toner recovery mechanism 12, and the recovered toner is replenished into the toner box 2 again to complete the toner recovery and reuse operation, or the isolation plate inside the recovery flow channel is lowered, and the recovered toner is stored at the bottom of the toner recovery mechanism 12 to collect and recycle the toner, and each time new toner is added, the toner recovery mechanism 12 is removed, the collected toner is fully mixed with the new toner and then recycled, and at the same time, the sieve plate 126 area inside the toner recovery mechanism 12 is cleaned.

[0044] The above are only preferred specific implementation modes of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A drum assembly for a printing device, comprising a fixed bracket (1), a toner cartridge (2) being arranged on the side of the fixed bracket (1), and a toner adding port (7) being arranged on the top of the toner cartridge (2), a charging roller (10), a photosensitive drum (5) and a developing roller (15) being rotatably mounted in sequence inside the fixed bracket (1), and the developing roller (15) being located at the bottom of the toner cartridge (2), a transmission member (6) being arranged at the end of the charging roller (10) and being rotated synchronously with the photosensitive drum (5), and a protective cover (8) being fixed and snapped on the top of the fixed bracket (1), characterized in that: A toner conveying roller (14) is also installed at the bottom of the toner box (2), and a gear group (4) is arranged between the toner conveying roller (14) and the end of the developing roller (15). A developing scraper (13) cooperating with the surface of the developing roller (15) is also installed at the bottom of the toner box (2). A powder quantity monitoring sensor (3) is installed at the top of the toner box (2), and the bottom of the powder quantity monitoring sensor (3) is located at the connection position of the developing roller (15) and the toner conveying roller (14). A laser emitting module (11) cooperating with the photosensitive drum (5) is also installed inside the fixed bracket (1); A cleaning scraper mechanism (16) is arranged on the other side of the fixed bracket (1), and the cleaning scraper mechanism (16) is located on the side of the photosensitive drum (5). A toner recovery mechanism (12) is arranged above the fixed bracket (1). A delivery pipe (17) is installed between the ends of the cleaning scraper mechanism (16) and the toner recovery mechanism (12). A recovery flow channel connected to the toner cartridge (2) is arranged on the side of the toner recovery mechanism (12), and a movable isolation plate is arranged inside the recovery flow channel. A fixing mechanism (9) is also arranged on the other side of the fixed bracket (1); The toner recovery mechanism (12) comprises a recovery shell (121) and a movable cover (122); a dispersion pipe (125) is installed at the middle position of the bottom of the movable cover (122); a bidirectional conveying auger (123) is rotatably installed inside the dispersion pipe (125); an auxiliary motor for driving the bidirectional conveying auger (123) to rotate is installed at the end of the dispersion pipe (125); a plurality of discharge slots are arranged at the bottom of the dispersion pipe (125); (12) also includes a sieve plate (126) clamped to the bottom of the movable cover (122), and a plurality of vibration springs (124) are installed in the middle of the sieve plate (126), and the discharge grooves are evenly distributed above the vibration springs (124), the vibration spring (124) is composed of a spiral spring spring, and the outer end of the spring spring is fixed to the sieve plate (126), and the inner end of the spring spring is installed with a connecting bolt, which passes through one of the discharge grooves and contacts with the bidirectional conveying auger (123); The cleaning scraper mechanism (16) comprises a cleaning shell (161), a rotating rod (162) is rotatably mounted inside the cleaning shell (161), and a motor (169) is mounted at one end of the cleaning shell (161) for driving the rotating rod (162) to rotate, and pushing blades (163) arranged in opposite spiral directions are arranged at both ends of the rotating rod (162), and a scraper assembly that is in contact with the surface of the photosensitive drum (5) is arranged at the opening of the cleaning shell (161), and the scraper assembly comprises a positioning member ( 164), and a movable member (165) slidably mounted at the opening of the cleaning shell (161), the positioning member (164) and the movable member (165) are connected by a spring, a scraper portion (166) is arranged above the front end of the movable member (165), and an inclined guide portion (167) is arranged below the front end of the movable member (165), symmetrically distributed collecting pipes (168) are arranged at both ends of the cleaning shell (161), and the collecting pipes (168) are composed of a plurality of short tubes with a trumpet-shaped structure, and a C-shaped notch is arranged between each short tube.

2. A drum assembly for a printing device according to claim 1, characterized in that: The front end of the developing scraper (13) is provided with a plurality of elastic vibration sheets, and the top of the elastic vibration sheets is provided with an elastic column.

3. A drum assembly for a printing device according to claim 1, characterized in that: The fixing mechanism (9) comprises a fixing housing (91), and two heaters (92) arranged in a C-shaped structure are fixedly mounted on the bottom of the fixing housing (91), and a fixing roller (93) is mounted between the two heaters (92).

4. A drum assembly for a printing device according to claim 3, characterized in that: The fixing housing (91) is provided with a mounting groove inside, and a dust collecting cover (96) is plugged in and connected inside the mounting groove, a scraper in contact with the surface of the fixing roller (93) is provided at the bottom of the dust collecting cover (96), an electrostatic rod (95) is installed inside the dust collecting cover (96), and a plurality of dust collecting screens (94) are provided at the bottom of the electrostatic rod (95).

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