Automatic detection device for flour outlet knife

Abstract

The utility model relates to printing equipment detection and maintenance technical field especially, a kind of powder outlet knife automatic detection device, including mounting bracket and connecting rod etc., the mounting bracket bottom is connected with powder scraping knife, mounting bracket front side is connected with fixed frame, connecting rod upper end is slidably connected in fixed frame, connecting rod top is rotatably connected with adjusting rod, adjusting rod rear end is threadedly connected with mounting bracket, connecting rod bottom end is slidably connected with contact block, pressure sensor is installed in connecting rod, reset spring around pressure sensor is provided in connecting rod, contact block front side is extruded with pressure sensor, and visual adjusting component for setting the initial position of contact block is provided in the side of connecting rod bottom portion. Through the extrusion cooperation of pressure sensor and contact plate, the contact pressure change data caused by powder scraping knife bending is collected in real time, when the pressure value exceeds safety threshold, active warning signal is sent, the detection and early warning of powder outlet knife are completed, the purpose of preventive maintenance and automatic maintenance is realized.

Description

Technical Field

[0001] This utility model relates to the field of printing equipment testing and maintenance technology, and in particular to an automatic toner dispensing blade detection device. Background Technology

[0002] As a core device for modern office work and image output, the image quality of laser printers highly depends on the precise control of toner in the developing system. The toner ejector blade is a key functional component in the developing assembly, typically made of a flexible metal sheet or composite material. Its blade fits tightly against the surface of the developing roller, forming a uniform toner layer thickness through elastic deformation, thus ensuring clear images and consistent tones. With the advancement of printing technology, the design of the toner ejector blade must balance wear resistance, elastic recovery, and frictional compatibility with the developing roller to meet the demands of high-frequency, high-precision printing.

[0003] In existing technologies, the powder ejector blade and the developing roller typically employ an interference fit frictional contact method, generating contact pressure through the bending deformation of the blade. However, this design forces the powder ejector blade to continuously endure unidirectional bending stress during long-term operation: under repeated friction in the rotational direction of the developing roller, the blade remains in a state of elastic deformation in the same direction, resulting in uneven stress distribution within the material. Although the powder ejector blade material needs to possess certain fatigue resistance, long-term unidirectional stress will still accelerate the plastic deformation or surface wear of the blade, thereby leading to a decrease in powder control accuracy.

[0004] Currently, there is a lack of real-time monitoring methods for the degradation or failure of the toner blade. Since blade deformation or wear is a gradual process, and existing printers only indirectly reflect problems through the final print quality, users can only notice the abnormality after the print quality has deteriorated significantly. At this point, the toner blade may have already suffered irreversible structural damage, requiring machine shutdown and replacement of parts, resulting in high maintenance costs and affecting equipment efficiency. Utility Model Content

[0005] To overcome the shortcomings of delayed detection and passive maintenance, this utility model provides an automatic detection device for powder discharge blades, aiming to solve the above-mentioned problems.

[0006] An automatic powder scraper detection device includes a mounting frame and a connecting rod. A powder scraper is connected to the bottom of the mounting frame and is connected to the printer via the mounting frame. A fixed frame is connected to the front of the mounting frame. The upper end of the connecting rod is slidably connected to the fixed frame. An adjusting rod is rotatably connected to the top of the connecting rod. The rear end of the adjusting rod is threadedly connected to the mounting frame. A contact block is slidably connected to the bottom of the connecting rod. A pressure sensor is installed inside the connecting rod. A return spring surrounding the pressure sensor is provided inside the connecting rod. One end of the return spring is connected to the connecting rod, and the other end is connected to the contact block. The front side of the contact block presses against the pressure sensor, and the rear side of the contact block contacts the powder scraper. A visual adjustment component for setting the initial position of the contact block is provided on the bottom side of the connecting rod.

[0007] Furthermore, it is particularly preferred that the visual adjustment component includes a movable plate, a limiting groove is opened on the front side of the connecting rod, the movable plate is slidably connected in the limiting groove, the movable plate is connected to the left front end of the contact block, and an identification card is connected to the left side of the connecting rod.

[0008] Furthermore, it is particularly preferred that both ends of the movable plate are connected to telescopic pads, and the other ends of the two telescopic pads are connected to the connecting rod, located at both ends of the limiting groove.

[0009] Furthermore, it is particularly preferred that the side of the contact block that contacts the powder scraper is connected to a protective pad.

[0010] Furthermore, it is particularly preferred that a sealing gasket is circumferentially connected to the bottom front end of the connecting rod, and the sealing gasket is slidably connected to the contact block.

[0011] Furthermore, it is particularly preferred that the adjusting hole at the end of the adjusting rod is provided with a dust cover.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0013] 1. By combining the pressure sensor with the contact plate, the system collects real-time data on the contact pressure changes caused by the bending of the powder scraper. When the pressure value exceeds the safety threshold, it actively sends a warning signal, thus completing the detection and early warning of the powder scraper and achieving the purpose of preventive maintenance and automatic repair.

[0014] 2. By adjusting the screw drive between the rod and the fixed frame, the connecting rod is pushed to move axially and drive the contact plate to accurately contact the powder scraper. Combined with the alignment and calibration of the moving plate and the identification card in the vision adjustment component, the initial position of the contact plate is ensured to meet the design tolerance, thereby improving the accuracy of the inspection. Attached Figure Description

[0015] Figure 1This is a schematic diagram of the overall structure of this utility model.

[0016] Figure 2 This is a cross-sectional view showing the connection relationship between the connecting rod and the adjusting rod of this utility model.

[0017] Figure 3 This is a cross-sectional view showing the connection relationship between the reset spring and the pressure sensor of this utility model.

[0018] Figure 4 This is a cross-sectional view showing the connection relationship between the telescopic pad and the movable plate of this utility model.

[0019] The above-mentioned attached drawings include the following reference numerals: 1. Mounting bracket, 2. Powder scraper, 3. Fixing bracket, 4. Connecting rod, 5. Adjusting rod, 6. Contact block, 7. Return spring, 8. Pressure sensor, 9. Limiting groove, 10. Moving plate, 11. Identification card, 12. Telescopic pad, 13. Protective pad, 14. Sealing pad, 15. Dust cover. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of this utility model. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of this utility model.

[0021] Example: An automatic detection device for powder discharge blades, such as Figures 1-4 As shown, the device includes a mounting bracket 1, a toner scraper 2, a fixing bracket 3, a connecting rod 4, an adjusting rod 5, a contact block 6, a return spring 7, a pressure sensor 8, and a vision adjustment assembly. The toner scraper 2 is connected to the bottom of the mounting bracket 1 and is fixed inside the printer via the mounting bracket 1. The fixing bracket 3 is connected to the front of the mounting bracket 1. The upper end of the connecting rod 4 is slidably connected to the fixing bracket 3. The top of the connecting rod 4 is rotatably connected to the adjusting rod 5, and the rear end of the adjusting rod 5 is threadedly connected to the mounting bracket 1. The bottom end of the connecting rod 4 is slidably connected to the contact block 6. The pressure sensor 8 is installed inside the connecting rod 4, and the return spring 7 is installed inside the connecting rod 4, surrounding the pressure sensor. 8. On the periphery, one end of the return spring 7 is connected to the inside of the connecting rod 4, and the other end is connected to the contact block 6. The front side of the contact block 6 is pressed against the pressure sensor 8. The pressure sensor 8 sets a safe pressure threshold. When the powder scraper 2 bends and the contact pressure exceeds the threshold, the pressure sensor 8 transmits a signal to the control system. The control system actively sends a warning signal to the user. The rear side of the contact block 6 contacts the powder scraper 2. The adjusting rod 5 realizes the axial displacement of the connecting rod 4 through threaded transmission, controlling the initial contact pressure between the bottom contact block 6 of the connecting rod 4 and the powder scraper 2. A visual adjustment component for setting the initial position of the contact block 6 is provided on the bottom side of the connecting rod 4.

[0022] like Figure 4 As shown, the visual adjustment component includes a movable plate 10 and an identification card 11. A limiting groove 9 is opened on the front side of the connecting rod 4. The movable plate 10 is slidably connected in the limiting groove 9. The movable plate 10 is connected to the left front end of the contact block 6. The identification card 11 is connected to the left side of the connecting rod 4. By intuitively aligning the movable plate 10 and the identification card 11, the calibration difficulty is reduced and the assembly efficiency and initial position consistency are improved.

[0023] like Figure 4 As shown, it also includes telescopic pads 12. Both ends of the moving plate 10 are connected to telescopic pads 12. The other ends of the two telescopic pads 12 are connected to the connecting rod 4 and located at both ends of the limiting groove 9. The telescopic pads 12 dynamically expand and contract with the displacement of the moving plate 10, always sealing the gap between the limiting groove 9 and the moving plate 10, ensuring the cleanliness of the testing environment.

[0024] like Figure 3 As shown, it also includes a protective pad 13. The side of the contact block 6 that contacts the powder scraper 2 is connected to the protective pad 13. The protective pad 13 is made of a low coefficient of friction material. The protective pad 13 can transmit pressure and buffer impact, thus extending the service life of the powder scraper 2 and the contact block 6.

[0025] like Figure 3 As shown, it also includes a sealing gasket 14. The sealing gasket 14 is connected around the bottom front end of the connecting rod 4. The sealing gasket 14 is slidably connected to the contact block 6 and always fits against the outer wall of the contact block 6 to form a dynamic seal, avoiding the jamming problem caused by the accumulation of wear particles.

[0026] like Figure 1 As shown, it also includes a dust cover 15. The adjustment hole at the end of the adjustment rod 5 is provided with a dust cover 15 to prevent carbon powder or foreign objects from entering the inner hexagonal hole of the adjustment rod 5 and improve the reliability of maintenance operations.

[0027] First, the staff assembled and fixed the powder scraper 2 to the mounting bracket 1, and then removed the dust cover 15 from the end of the adjusting rod 5. Using an Allen wrench inserted into the Allen hole at the end of the adjusting rod 5 and rotating it, the adjusting rod 5, under threaded engagement, pushed the top of the connecting rod 4 to slide along the guide groove of the fixing bracket 3, causing the connecting rod 4 to move back and forth. During this process, the contact block 6 at the bottom of the connecting rod 4 moved downwards. When the front side of the contact block 6 contacted the rear surface of the powder scraper 2, the protective pad 13 underwent slight elastic compression due to the contact pressure. At this time, the moving plate 10 followed the contact block 6, sliding along the limiting groove 9 on the side of the connecting rod 4. When the moving plate 10 was fully aligned with the identification card 11, it indicated that the contact block 6 had been adjusted to the initial setting position, the pressure sensor 8 was fully in contact with the front side of the contact block 6, and the reset spring 7 was in a slightly pre-compressed state, completing the initial calibration.

[0028] When the bottom end of the doctor blade 2 is subjected to the frictional force of the developing roller, it will bend forward. This deformation is transmitted to the protective pad 13 through the rear surface of the doctor blade 2. The protective pad 13 converts the longitudinal pressure into a lateral thrust on the contact block 6, and the contact block 6, under this force, presses against the pressure sensor 8. The pressure sensor 8 collects contact pressure data in real time, and the change in pressure value reflects the degree of bending of the doctor blade 2: when the degree of bending of the doctor blade 2 increases, the degree of compression of the pressure sensor 8 by the contact block 6 increases synchronously, and the sensor output signal is strengthened accordingly. At the same time, the elastic force of the return spring 7 and the deformation recovery force of the protective pad 13 work together to assist the doctor blade 2 in rebounding during the printing gap, slowing down the accumulation of plastic deformation.

[0029] During the sliding process of the moving plate 10, the telescopic pads 12 on both sides are stretched or compressed with the displacement of the moving plate 10, always adhering to both ends of the limiting groove 9, forming a dynamic sealing structure to prevent toner particles from entering the connecting rod 4 and interfering with the detection of the pressure sensor 8. The dust cover 15 at the end of the adjusting rod 5 closes the hexagonal hole when not in the adjusting state to prevent toner or foreign objects from entering the adjusting mechanism and causing rotational failure. The sealing gasket 14 at the bottom of the powder scraper 2 slides with the contact block 6 to further prevent toner from entering the contact area and ensure a clean detection environment for the pressure sensor 8.

[0030] Multiple mounting brackets 3 on the mounting frame 1 correspond to different axial positions of the toner scraper 2. Each mounting bracket 3 contains a pressure sensor 8 that can independently detect bending data in a localized area. By comparing the pressure values ​​at different locations, it can be determined whether the toner scraper 2 exhibits uneven axial deformation. When the pressure sensor 8 detects that the bending amount is close to the repairable threshold, it prompts for manual reset: after removing the toner scraper 2, its elasticity can be restored by applying bending stress in the opposite direction. Replacement is only necessary when the pressure value consistently exceeds the repair range or the surface of the toner scraper 2 is severely worn, thus avoiding print quality issues caused by bending failure.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit the scope of protection of this utility model. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the essence and scope of the technical solutions of this utility model.

Claims

1. A flour outlet knife automatic detection device, characterized in that, The device includes a mounting bracket (1) and a connecting rod (4). A powder scraper (2) is connected to the bottom of the mounting bracket (1), and the powder scraper (2) is connected to the printer via the mounting bracket (1). A fixing bracket (3) is connected to the front of the mounting bracket (1). The upper end of the connecting rod (4) is slidably connected to the fixing bracket (3). An adjusting rod (5) is rotatably connected to the top of the connecting rod (4). The rear end of the adjusting rod (5) is threadedly connected to the mounting bracket (1). A contact block (6) is slidably connected to the bottom of the connecting rod (4). A pressure sensor (8) is installed inside the connecting rod (4). A return spring (7) is provided inside the connecting rod (4) surrounding the pressure sensor (8). One end of the return spring (7) is connected inside the connecting rod (4), and the other end is connected to the contact block (6). The front side of the contact block (6) is pressed against the pressure sensor (8), and the rear side of the contact block (6) is in contact with the powder scraper (2). A visual adjustment component for setting the initial position of the contact block (6) is provided on the bottom side of the connecting rod (4).

2. The automatic detection device for flour outlet knife according to claim 1, characterized in that, The visual adjustment component includes a movable plate (10), a limiting groove (9) is opened on the front side of the connecting rod (4), the movable plate (10) is slidably connected in the limiting groove (9), the movable plate (10) is connected to the left front end of the contact block (6), and an identification card (11) is connected to the left side of the connecting rod (4).

3. The automatic detection device for powder discharge blade according to claim 2, characterized in that, The movable plate (10) is connected to telescopic pads (12) at both ends. The other ends of the two telescopic pads (12) are connected to the connecting rod (4) and located at both ends of the limiting groove (9).

4. The automatic detection device for powder discharge blade according to claim 3, characterized in that, A protective pad (13) is connected to the side of the contact block (6) that contacts the powder scraper (2).

5. The automatic detection device for powder discharge blade according to claim 4, characterized in that, A sealing gasket (14) is connected around the bottom front end of the connecting rod (4), and the sealing gasket (14) is slidably connected to the contact block (6).

6. The automatic detection device for powder discharge blade according to claim 5, characterized in that, The adjusting hole at the end of the adjusting rod (5) is provided with a dust cover (15).

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