Device and method for automatically detecting gap between photosensitive drum and developing roller

Abstract

The invention discloses a device and method for automatically detecting a gap between a photosensitive drum and a developing roller, a gap shaft for mounting the developing roller is sleeved on a photosensitive drum assembly, the photosensitive drum assembly comprises the photosensitive drum, and the device comprises a support for placing the photosensitive drum assembly. One end of the support is provided with a torque measuring mechanism for driving the photosensitive drum to rotate along the axis of the photosensitive drum, the side edge of the support is provided with a distance measuring mechanism, and the measuring end of the distance measuring mechanism can move along the axial direction parallel to the photosensitive drum and is used for respectively detecting the distance M of the gap shaft sleeve and the distance Nn of the plurality of groups of photosensitive drums; the distance measuring mechanism and the torque measuring mechanism are both connected with the control device. The method comprises the following steps: according to an average value of differences between a distance M and a plurality of groups of distances Nn, obtaining a gap between the photosensitive drum and the developing drum; according to the invention, the measurement result of the gap between the photosensitive drum and the developing drum is accurate, and the measurement data can be stored in a computer connected with the control equipment and can be conveniently traced in the future.

Description

Technical Field

[0001] The present invention relates to the technical field of toner cartridges, and particularly to a device and method for automatically detecting the gap between a photosensitive drum and a developing roller. Background Art

[0002] As a two-component toner cartridge with a carrier, the distance between the photosensitive drum and the developing roller is particularly important. If the distance is too large, the image will be light; if the distance is too small, the problem of the sample sheet carrying the carrier will occur.

[0003] Regarding the adjustment of the distance between the photosensitive drum and the developing roller, the prior art is, for example, a structure for controlling the distance between a photosensitive drum and a developing roller with the patent number: CN203101815U; however, for the detection of the distance between the photosensitive drum and the developing roller, the existing device detects the distance between the surface of the photosensitive drum and the surface of the gap bushing by means of the mechanical structure of a digital display dial indicator. First, zero the dial indicator: Place the OEM photosensitive drum sample on the device, and make the connecting rod contact the photosensitive drum. At this time, zero the dial indicator. Then place the product to be measured on the device, and make the gap bushing contact the connecting rod. At this time, the read value is the distance between the surface of the photosensitive drum and the surface of the developing roller. The existing such manual measuring device has low measuring efficiency, high manual measurement error rate, and the positioning reference of the device is the lower outer surface of the photosensitive drum, which has an impact on the measurement result. The correct reference should be the axis of the photosensitive drum. Moreover, the switching between different models is relatively complicated and time-consuming. The measurement result of the mechanical structure is not accurate enough. Summary of the Invention

[0004] The purpose of the invention is to provide a device and method for automatically detecting the gap between a photosensitive drum and a developing roller, which solves the problems of the existing such manual measuring device, such as low measuring efficiency, high manual measurement error rate, and inaccurate measurement result.

[0005] The present invention is realized as follows: A device for automatically detecting the gap between a photosensitive drum and a developing roller, a gap bushing for installing the developing roller is placed on the photosensitive drum assembly, and the photosensitive drum assembly includes a photosensitive drum. The device includes a support for placing the photosensitive drum. One end of the support is provided with a torque measuring mechanism for driving the photosensitive drum to rotate along the axis of the photosensitive drum. One side of the support is provided with a distance measuring mechanism, and the measuring end of the distance measuring mechanism can move along the axial direction parallel to the photosensitive drum to respectively detect the distance M of the gap bushing and the distance N of multiple groups of photosensitive drums n , and both the distance measuring mechanism and the torque measuring mechanism are connected to the control device.

[0006] In the present invention, by controlling the operation of the device driving torque measuring mechanism, the photosensitive drum rotates along the axis, avoiding the deviation of the axis during rotation and eliminating the measurement error rate caused by manually driving the photosensitive drum originally; the measuring end of the ranging mechanism can move along the axial direction parallel to the photosensitive drum, and during the operation of the photosensitive drum, the distance between the photosensitive drums can be sampled multiple times by the ranging mechanism, ensuring the accuracy of the measurement result of the gap between the photosensitive drum and the developing drum, and the torque of the drum unit itself can also be measured. The data of the ranging mechanism and the torque measuring mechanism are connected to the control device, and the measurement data can be stored in a computer connected to the control device for easy future traceability.

[0007] A further technical solution of the present invention is that the torque measuring mechanism includes a driving motor, a torque sensor, and a tooling that are coaxially connected in sequence, and the tooling is used to coaxially and fixedly connect the output shaft of the driving motor with the axis of the photosensitive drum.

[0008] The driving force of the driving motor is connected to the photosensitive drum assembly through the torque sensor and the tooling. During the process of driving the photosensitive drum to rotate by the driving motor, the ranging mechanism can sample the photosensitive drum multiple times, and the torque of the photosensitive drum can also be measured; the output end of the driving motor, the torque sensor, and the tooling are all coaxial, ensuring that the axis remains unchanged when the driving mechanism drives the photosensitive drum to move, making the detection of the gap between the photosensitive drum and the developing roller more accurate.

[0009] A further technical solution of the present invention is that the tooling includes a telescopic connecting part, and the connecting part can be coaxially connected to the end of the photosensitive drum.

[0010] Before the product to be detected is installed on the support, the tooling can be compressed through the connecting part to ensure that the product to be detected is smoothly installed on the support and avoid interference.

[0011] A further technical solution of the present invention is that the connecting part is connected with a sleeve part through an elastic guiding part, and the sleeve part is coaxially connected with the torque sensor.

[0012] The connecting part is coaxially connected to the product to be detected. The connecting part can not only avoid the installation of the product through the elastic guiding part but also ensure stability during the contraction process. When the elastic guiding part contracts, the elastic guiding part can contract into the sleeve part.

[0013] A further technical solution of the present invention is that the ranging mechanism includes a ranging motor, a transmission shaft, and a laser ranging sensor. The laser ranging sensor is connected to the transmission shaft through a sensor bracket, and the ranging motor is connected to the transmission shaft for the laser ranging sensor to move along the axial direction of the transmission shaft.

[0014] The distance measuring motor drives the transmission shaft to act. The movement of the transmission shaft causes the sensor bracket to move along the axial direction of the transmission shaft, enabling the laser distance measuring sensor to measure the distance between the surface of the spacing bushing and the surface of the photosensitive drum, and the accuracy of using the laser distance measuring sensor is higher.

[0015] A further technical solution of the present invention is that there are two laser distance measuring sensors, which can move away from or close to each other.

[0016] A further technical solution of the present invention is that the device further includes a main body frame, the main body frame includes a base and a distance measuring mounting bracket placed on the base, the support is placed on the base, and the distance measuring mounting bracket is placed on one side of the support.

[0017] Place the photosensitive drum assembly on the support, the distance measuring mechanism is placed on the side of the photosensitive drum through the distance measuring mounting bracket, and the movement track of the distance measuring end of the distance measuring mechanism is parallel to the axial direction of the photosensitive drum, ensuring the accuracy of the gap measurement between the photosensitive drum and the developing roller.

[0018] A further technical solution of the present invention is that the distance measuring mechanism is placed on the distance measuring mounting bracket, and the distance measuring end of the distance measuring mechanism is placed above the support. It is convenient for installation and measurement.

[0019] A further technical solution of the present invention is that the control device includes a control module and a display screen connected to the control module.

[0020] A method for automatically detecting the gap between the photosensitive drum and the developing roller, the method is based on the above-mentioned device, and the method includes the following steps:

[0021] S1. Place the photosensitive drum assembly with the gap sleeve shaft installed on the support, and the photosensitive drum assembly includes a photosensitive drum;

[0022] S2. The distance measuring mechanism moves along the axial direction parallel to the photosensitive drum to the gap bushing, and the measuring end of the distance measuring mechanism detects the distance M of the gap bushing;

[0023] S3. The distance measuring mechanism moves along the axial direction parallel to the photosensitive drum to the photosensitive drum, the torque measuring mechanism drives the photosensitive drum to rotate, and the measuring end of the distance measuring mechanism detects multiple groups of distances N of the photosensitive drum n ;

[0024] S4. According to the average value of the difference between the distance M and multiple groups of distances N n , it is the gap size between the photosensitive drum and the developing drum.

[0025] Advantages of the present invention: The device of the present invention is easy to operate, and the measured data is accurate. Multiple samples can be taken to obtain an average value to reduce the jitter error and reduce the manual operation error. The device of the present invention does not need to use an OEM sample photosensitive drum (an OEM sample photosensitive drum refers to a photosensitive drum sample produced by an original equipment manufacturer (OEM) according to the specifications and requirements of the buyer) for calibration, which can avoid the differences between the sample photosensitive drum and the OEM photosensitive drum. The device of the present invention can obtain the torque value while measuring the size, reducing the operation steps for measuring torque.

[0026] All the data measured by the device of the present invention is stored in the computer, which has strong traceability. The device of the present invention is an automatic measuring device with high measuring efficiency and reduced labor costs.

[0027] The present invention relates to an automatic detection device for detecting the gap size between the surface of a photosensitive drum and the surface of a developing roller. It is characterized by accurate measurement, easy operation, and the ability to measure torque while detecting the gap. The measured data is automatically saved in the computer for easy future traceability. Description of the Drawings

[0028] Figure 1 It is a schematic diagram of the relationship structure of the photosensitive drum assembly, gap bushing, and developing drum provided by the present invention;

[0029] Figure 2 It is a front view of a device for automatically detecting the gap between a photosensitive drum and a developing roller provided by the present invention;

[0030] Figure 3 It is a three-dimensional view of a device for automatically detecting the gap between a photosensitive drum and a developing roller provided by the present invention;

[0031] Figure 4 It is an enlarged view of part A provided by the present invention;

[0032] Figure 5 It is a schematic diagram of the structure of the main frame provided by the present invention;

[0033] Figure 6 It is a schematic diagram of the structure of the distance measuring mechanism provided by the present invention;

[0034] Figure 7 It is a schematic diagram of the structure of the torque measuring mechanism provided by the present invention;

[0035] Figure 8 It is a schematic diagram of the structure of the control device provided by the present invention.

[0036] Reference numerals: 1. Support, 2. Photosensitive drum,

[0037] 3. Torque measurement mechanism, 31. Driving motor, 32. Torque sensor, 33. Tooling, 331. Connecting part, 332. Elastic guide, 333. Sleeve part, 34. Coupling

[0038] 4. Distance measurement mechanism, 41. Distance measurement motor, 42. Transmission shaft, 43. Laser distance measurement sensor, 44. Sensor bracket

[0039] 5. Clearance bushing, 6. Developing roller

[0040] 7. Control device, 71. Display screen, 72. Housing

[0041] 8. Main body frame, 81. Base, 82. Distance measurement mounting bracket Detailed implementation mode

[0042] The following uses specific specific examples to illustrate the implementation mode of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation modes. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.

[0043] Example 1:

[0044] Figure 1-8 A device for automatically detecting the gap between a photosensitive drum and a developing roller is shown. A clearance bushing 5 for installing the developing roller 6 is provided on the photosensitive drum assembly. The photosensitive drum assembly includes a photosensitive drum 2. The device includes a support 1 for placing the photosensitive drum assembly. One end of the support 1 is provided with a torque measurement mechanism 3 for driving the photosensitive drum 2 to rotate along the axis of the photosensitive drum 2. A distance measurement mechanism 4 is provided on the side of the support 1. The measurement end of the distance measurement mechanism 4 can move along the axial direction parallel to the photosensitive drum 2 to respectively detect the distance M of the clearance bushing 5 and the distance N of multiple photosensitive drums 2 n , and both the distance measurement mechanism 4 and the torque measurement mechanism 3 are connected to the control device 7.

[0045] In the present invention, the torque measurement mechanism is driven by the control device to make the photosensitive drum rotate along the axis, avoiding the offset of the axis during the rotation process and eliminating the measurement error rate caused by manually driving the photosensitive drum before; the measurement end of the distance measurement mechanism can move along the axial direction parallel to the photosensitive drum. During the operation of the photosensitive drum, the distance between the photosensitive drums can be sampled multiple times by the distance measurement mechanism to ensure the accuracy of the measurement result of the gap between the photosensitive drum and the developing drum, and the torque of the drum set itself can be measured. The data of the distance measurement mechanism and the torque measurement mechanism are connected to the control device, and the measurement data can be stored in a computer connected to the control device for easy future traceability.

[0046] In this embodiment, the torque measuring mechanism 3 includes a driving motor 31, a torque sensor 32, and a tooling 33 that are coaxially connected in sequence. The tooling 33 is used to coaxially and fixedly connect the output shaft of the driving motor 31 to the axis of the photosensitive drum 2.

[0047] The driving force of the driving motor is connected to the photosensitive drum assembly through the torque sensor and the tooling. During the process of driving the photosensitive drum to rotate by the driving motor, the ranging mechanism can sample the photosensitive drum multiple times and can measure the torque of the photosensitive drum; the output end of the driving motor, the torque sensor, and the tooling are all coaxial, ensuring that the axis remains unchanged when the driving mechanism drives the photosensitive drum to move, making the gap detection between the photosensitive drum and the developing roller more accurate.

[0048] In this embodiment, the driving motor 31 is a servo motor, the torque sensor 32 is a high-precision torque sensor, the driving motor 31 is connected to the torque sensor 32 through a coupling 34 and a flange, and the torque sensor 32 is connected to the tooling 33 through another flange.

[0049] In this embodiment, both the torque sensor 32 and the driving motor 31 are connected to the main body frame 8 through mounting seats.

[0050] In this embodiment, the tooling 33 includes a telescopic connecting portion 331, and the connecting portion 331 can be coaxially connected to the end of the photosensitive drum 2.

[0051] Before the product to be detected is installed on the support, the tooling can be compressed through the connecting portion to ensure that the product to be detected is smoothly installed on the support and avoid interference.

[0052] In this embodiment, the connecting portion 331 is connected with a sleeve member 333 through an elastic guiding member 332, and the sleeve member 333 is coaxially connected to the torque sensor 32.

[0053] The connecting portion is coaxially connected to the product to be detected. The connecting portion can not only avoid the installation of the product through the elastic guiding member but also ensure stability during the contraction process. When the elastic guiding member contracts, the elastic guiding member can contract into the sleeve member.

[0054] In this embodiment, one end of the connecting portion 331 can extend into the end of the photosensitive drum assembly, and the driving motor 31 can drive the photosensitive drum 2 to rotate through the connecting portion 331; the other end of the connecting portion 331 is provided with an elastic guiding member 332.

[0055] In this embodiment, the elastic guiding member 332 includes a central shaft and an auxiliary shaft disposed on the outer periphery of the central shaft. A spring is sleeved on the central shaft. The central shaft is centrally connected to the connecting portion 331, and the auxiliary shaft passes through the connecting portion 331. The central shaft can contract into the sleeve member 333.

[0056] In this embodiment, the drive motor 31 is a servo motor.

[0057] In this embodiment, as Figure 7 , for the torque measuring mechanism 3, it is composed of a high-precision dynamic torque sensor 32, a torque measuring tooling 33, a servo motor, a coupling 34, and a servo motor base. The servo motor base is fixed to the base 81 with bolts, the servo motor is fixed to the servo motor base with bolts, the servo motor, the torque measuring tooling 33, and the high-precision dynamic torque sensor 32 are connected by flanges, and the high-precision dynamic torque sensor 32 is connected to the servo motor by the coupling 34.

[0058] In this embodiment, the distance measuring mechanism 4 includes a distance measuring motor 41, a transmission shaft 42, and a laser distance sensor 43. The laser distance sensor 43 is connected to the transmission shaft 42 through a sensor bracket 44, and the distance measuring motor 41 is connected to the transmission shaft 42 for the laser distance sensor 43 to move along the axial direction of the transmission shaft 42.

[0059] The distance measuring motor drives the transmission shaft to act. The action of the transmission shaft causes the sensor bracket to move along the axial direction of the transmission shaft, so that the laser distance sensor can measure the distance between the surface of the spacing bushing and the surface of the photosensitive drum. Using the laser distance sensor has higher accuracy.

[0060] In this embodiment, there are two laser distance sensors 43 and they can move away from or close to each other.

[0061] In this embodiment, the transmission shaft 42 is a bidirectional lead screw, and the sensor bracket 44 is connected to the slide of the bidirectional lead screw.

[0062] In this embodiment, the sensor bracket 44 is L-shaped.

[0063] In this embodiment, the distance measuring motor 41 is a servo motor.

[0064] In this embodiment, as Figure 6 , for the laser distance measuring mechanism 4, it is composed of 1 servo motor, 1 bidirectional sliding lead screw, 2 high-precision laser distance sensors, and 2 sensor brackets. The lead screw is fixed to the laser distance measuring frame with bolts, the 2 high-precision laser distance sensors are respectively fixed to the two sensor brackets with bolts, and the sensor brackets are installed on the slide of the lead screw with bolts.

[0065] In this embodiment, the device further includes a main body frame 8. The main body frame 8 includes a base 81 and a distance measuring mounting frame 82 placed on the base 81. The support 1 is placed on the base 81, and the distance measuring mounting frame 82 is placed on one side of the support 1.

[0066] Place the photosensitive drum assembly on the support. The distance measuring mechanism is placed on the side of the photosensitive drum through the distance measuring mounting bracket. The movement track of the distance measuring end of the distance measuring mechanism is parallel to the axis of the photosensitive drum, ensuring the accuracy of the gap measurement between the photosensitive drum and the developing roller.

[0067] In this embodiment, there are two supports 1, namely the left support and the right support, and the photosensitive drum assembly with the clearance bushing 5 is supported by the left and right supports.

[0068] In this embodiment, the support 1 is placed on the front of the base 81, and the distance measuring mounting bracket 82 is placed on the back of the base 81. The extending direction of the distance measuring mounting bracket 82 is parallel to the straight line where the support 1 is located.

[0069] In this embodiment, the control device 7 is placed on the right side of the base 81. As other embodiments, the control device 7 is placed on the left side of the base 81.

[0070] In this embodiment, the distance measuring mechanism 4 is placed on the distance measuring mounting bracket 82, and the distance measuring end of the distance measuring mechanism 4 is placed above the support 1. This facilitates installation and measurement.

[0071] In this embodiment, the photosensitive drum assembly with the clearance bushing 5 is placed on the support 1, and the laser distance sensor 43 on the distance measuring mechanism 4 is placed directly above the photosensitive drum 2 and the clearance bushing 5.

[0072] As other embodiments, the laser distance sensor 43 is placed on the side or bottom of the photosensitive drum 2.

[0073] In this embodiment, as Figure 5 , it is the main body frame 8, which is composed of the base 81, the product left support, the product right support, and the laser distance measuring frame 82. The product left and right supports and the laser distance measuring frame 82 are fixed to the base 81 with bolts. The laser distance measuring frame 81 is built with aluminum profiles and locked with angle codes and bolts.

[0074] In this embodiment, the control device 7 includes a control module and a display screen 71 connected to the control module.

[0075] In this embodiment, the control device 7 further includes a housing 72. The control module is placed inside the housing 72, and the display screen 71 is placed on the front of the housing 72.

[0076] In this embodiment, the control device 7 is placed at the end of the base 81.

[0077] In this embodiment, as Figure 8, it is the control device 7, mainly composed of a display screen 71 and a display screen housing 72. The display screen 71 is installed in the display screen housing 72, and the display screen housing 72 is fixed to the base with bolts; a control module communicatively connected to the display screen is provided inside the display screen housing.

[0078] As Figure 2 shown, the present invention consists of four parts: a main body frame 8, a ranging mechanism 4, a torque measuring mechanism 3, and a control device 7 containing a host computer.

[0079] Embodiment 2:

[0080] A method for automatically detecting the gap between a photosensitive drum and a developing roller, the method being based on the device described in Embodiment 1, the method comprising the following steps:

[0081] S1. Place the photosensitive drum assembly with the gap sleeve shaft 5 installed on the support 1; the photosensitive drum assembly includes a photosensitive drum 2;

[0082] S2. The ranging mechanism 4 moves axially along the photosensitive drum 2 to the gap sleeve 5, and the measuring end of the ranging mechanism 4 detects the distance M of the gap sleeve 5;

[0083] S3. The ranging mechanism 4 moves axially along the photosensitive drum 2 to the photosensitive drum 2, the torque measuring mechanism 3 drives the photosensitive drum 2 to rotate, and the measuring end of the ranging mechanism 4 detects multiple sets of distances N of the photosensitive drum 2 n ;

[0084] S4. According to the average value of the difference between the distance M and multiple sets of distances N n , it is the gap size between the photosensitive drum and the developing drum.

[0085] In this embodiment, the torque measuring mechanism 3 drives the photosensitive drum 2 to rotate 90° each time, records 4 torque values, and at this time 4 N values will be read, and the N n is N4.

[0086] The working principle of the present invention: The distance measurement function of the present invention is realized by 2 high-precision laser ranging sensors. The drum product is correctly fixed on the left and right supports of the product to ensure no shaking, and the measuring surface of the gap sleeve will be parallel to the base. The ranging motor drives the ball screw to work, and the sensor bracket drives the laser sensor to move left and right to the position of the gap sleeve at the same time. At this time, the data of the laser sensor is read as the base value M; the servo motor continues to work, the laser sensor moves to the measuring position of the photosensitive drum, and reads the data N at this time; the torque measuring mechanism starts to drive the photosensitive drum to rotate, 90° each time, records 4 torque values, and at this time 4 N values will be read. The result obtained by taking the average value of the difference between each of them and the M value is the distance between the surface of the photosensitive drum and the surface of the developing roller.

[0087] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A device for automatically detecting the gap between a photosensitive drum and a developing roller, wherein a gap sleeve (5) for mounting a developing roller (6) is arranged on a photosensitive drum assembly, the photosensitive drum assembly comprising a photosensitive drum (2), the device comprising a support (1) for placing the photosensitive drum assembly, and characterized in that: A torque measuring mechanism (3) for driving the photosensitive drum (2) to rotate along the axis of the photosensitive drum (2) is provided at one end of the support (1), and a distance measuring mechanism (4) is provided on the side of the support (1). The measuring end of the distance measuring mechanism (4) can move along the axial direction parallel to the photosensitive drum (2) to respectively detect the distance M of the gap sleeve (5) and the distance N of the multiple groups of photosensitive drums (2). n The distance measuring mechanism (4) and the torque measuring mechanism (3) are both connected to a control device (7).

2. The device for automatically detecting the gap between a photosensitive drum and a developing roller according to claim 1, characterized in that: The torque measuring mechanism (3) comprises a driving motor (31), a torque sensor (32) and a tooling (33) which are coaxially connected in sequence, and the tooling (33) is coaxially connected to the photosensitive drum (2).

3. The device for automatically detecting the gap between the photosensitive drum and the developing roller according to claim 2, characterized in that: The tooling (33) comprises a retractable connecting portion (331), and the connecting portion (331) can be coaxially and detachably connected to the end of the photosensitive drum (2).

4. The device for automatically detecting the gap between the photosensitive drum and the developing roller according to claim 3, characterized in that: The connecting portion (331) is connected to a sleeve member (333) via an elastic guide member (332), and the sleeve member (333) is coaxially connected to the torque sensor (32).

5. A device for automatically detecting the gap between a photosensitive drum and a developing roller according to any one of claims 1 to 4, characterized in that: The distance measuring mechanism (4) comprises a distance measuring motor (41), a transmission shaft (42) and a laser distance measuring sensor (43); the laser distance measuring sensor (43) is connected to the transmission shaft (42) via a sensor bracket (44); the distance measuring motor (41) is connected to the transmission shaft (42) for the laser distance measuring sensor (43) to move along the axial direction of the transmission shaft (42).

6. The device for automatically detecting the gap between the photosensitive drum and the developing roller according to claim 5, characterized in that: There are two laser distance measuring sensors (43) which can be spaced apart from or close to each other.

7. A device for automatically detecting the gap between a photosensitive drum and a developing roller according to any one of claims 1 to 4, characterized in that: The device further comprises a main frame (8), the main frame (8) comprising a base (81) and a distance measuring mounting frame (82) placed on the base (81), the support (1) is placed on the base (81), and the distance measuring mounting frame (82) is placed on one side of the support (1).

8. The device for automatically detecting the gap between the photosensitive drum and the developing roller according to claim 7, characterized in that: The distance measuring mechanism (4) is placed on the distance measuring mounting frame (82), and the distance measuring end of the distance measuring mechanism (4) is placed above the support (1).

9. A device for automatically detecting the gap between a photosensitive drum and a developing roller according to any one of claims 1 to 4, characterized in that: The control device (7) comprises a control module and a display screen (71) connected to the control module.

10. A method for automatically detecting the gap between a photosensitive drum and a developing roller, characterized in that: The method is based on the device according to any one of claims 1 to 9, and the method comprises the following steps: S1, placing a photosensitive drum assembly equipped with a gap sleeve shaft (5) on a support (1); the photosensitive drum assembly includes a photosensitive drum (2); S2, the distance measuring mechanism (4) moves along the axial direction parallel to the photosensitive drum (2) to the gap sleeve (5), and the measuring end of the distance measuring mechanism (4) detects the distance M of the gap sleeve (5); S3, the distance measuring mechanism (4) moves to the photosensitive drum (2) along the axial direction parallel to the photosensitive drum (2), the torque measuring mechanism (3) drives the photosensitive drum (2) to rotate, and the measuring end of the distance measuring mechanism (4) detects the distance N between the multiple groups of photosensitive drums (2) n ; S4, according to the distance M and multiple groups of distances N n The average of the differences is the gap between the photosensitive drum and the developing drum.

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