Transmission system for laser printer and control method of transmission system

Abstract

The invention discloses a transmission system for a laser printer and a control method of the transmission system. The invention relates to the technical field of laser printers. The paper feeding device is specifically applied to a rack 2 of the printer and mainly comprises a paper feeding assembly 3, a clutch assembly, a coding assembly 6 and a controller. And the paper feeding assembly 3 is designed to receive the paper fed by the paper feeding mechanism 1 and is responsible for stably transporting the paper to a printing position of the printer. The clutch assembly is mounted on the paper feeding path; by accurately controlling the step length linear motion of the paper, the technology of the invention ensures the stable transmission of the paper in the printing process, thereby improving the printing quality. And meanwhile, deviation and blockage in the paper conveying process are reduced, so that the printing speed is correspondingly increased. According to the technology, by capturing and reading the motion information of the upper electromagnetic clutch in real time and accurately controlling the lower electromagnetic clutch, deviation and dislocation of paper in the conveying process are effectively reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of laser printers, in particular to a paper feeding technology of laser printers, and in particular to a transmission system for laser printers and a control method thereof. Background Art

[0002] The paper feed mechanism in a laser printer is an important part of the printer. Its main function is to accurately and stably take out paper from the paper box and deliver it to the printing position of the printer. The working process of the paper feed mechanism is roughly as follows:

[0003] S1. When the printer receives a print command, the paper feeding mechanism starts first, the pickup wheel rotates and rubs the paper, separates the paper from the paper box one by one and feeds it into the transmission channel of the printer.

[0004] S2. The paper is guided by the paper feed wheel component in the transmission channel and continues to move toward the printing position.

[0005] S3. At the same time, the paper sensor will monitor the position and status of the paper in real time to ensure that the paper can reach the printing position accurately.

[0006] In laser printers, the linear motion of the paper feed mechanism during paper feeding and paper output is often not completely consistent, because different types of paper (such as thickness, material, etc.) will perform differently during the transmission process, which will affect the paper feeding accuracy and step consistency of the paper feed mechanism.

[0007] Inconsistent step lengths may cause the paper to shift during printing, affecting the clarity and accuracy of the printed image or text. It may also increase the risk of paper getting stuck in the transmission channel, causing frequent paper jams in the printer and affecting work efficiency. Long-term inconsistent step lengths may aggravate the wear and aging of mechanical parts in the paper feeding mechanism, thereby shortening the life of the printer.

[0008] To this end, the present invention provides a transmission system for a laser printer and a control method thereof. Summary of the invention

[0009] In view of this, the embodiment of the present invention hopes to provide a transmission system for a laser printer and a control method thereof to solve or alleviate the technical problem existing in the prior art, that is, how to make the step length linear motion of paper consistent, and at least provide a beneficial option for this; the technical solution of the present invention is implemented as follows:

[0010] In the first aspect, a transmission system for a laser printer:

[0011] It is implemented on the printer frame and mainly consists of a paper feed assembly, a clutch assembly, an encoding assembly and a controller. The paper feed assembly is designed to receive the paper sent by the paper feed mechanism and is responsible for stably transporting it to the printing position of the printer. The clutch assembly is installed on the paper feed path, and its function is to ensure that the paper maintains the same linear motion step length as when it is sent by the paper feed mechanism during the transmission process. The encoding assembly is precisely installed in a position where it can sense the movement of the paper, and is used to obtain the linear motion information of the step length of the paper sent by the paper feed mechanism in real time. Finally, the controller is hidden in the frame and is responsible for receiving the information transmitted by the encoding assembly and accurately controlling the operation of the paper feed assembly and the clutch assembly based on this information.

[0012] In one embodiment, the clutch assembly is specifically designed to include a lower electromagnetic clutch and an upper electromagnetic clutch. These two parts drive the rubbing wheels, which correspond to the lower surface and upper surface of the paper respectively. When the paper is fed in by the paper feeding mechanism, the lower electromagnetic clutch and the upper electromagnetic clutch will work simultaneously, and the rotation of the rubbing wheels ensures that the paper maintains a stable step linear motion during the transmission process. This dual clutch and dual rubbing wheel design effectively improves the stability and accuracy of paper transmission.

[0013] In one embodiment, the transmission system further introduces a transmission belt assembly, which includes a driving wheel and two driven wheels. The driving wheel is closely connected to a driven wheel through a belt, establishing a stable transmission relationship, and the driven wheel is also closely connected to the lower electromagnetic clutch, forming an effective linkage mechanism. The other driven wheel establishes a transmission connection with the pickup wheel in the paper feeding mechanism through a belt, innovatively treating the pickup wheel as a driving wheel, and the driven wheel is also closely connected to the upper electromagnetic clutch. Through this design, the upper electromagnetic clutch can directly receive the linear motion information of the paper feeding step from the paper feeding mechanism, and the information is accurately captured by the encoding component. Subsequently, after rapid calculation by the controller, the rotation force of the driving wheel can be accurately controlled, so that the motion parameters of the lower electromagnetic clutch are adjusted to be completely consistent with the upper electromagnetic clutch. In this way, the linear motion of the step length of the paper in the paper feeding process in the paper feeding mechanism is effectively maintained.

[0014] In one embodiment, the encoding component is designed to include two parts: a PF encoder and a PF encoding reading sensor. The detection section of the PF encoder is carefully adapted to the upper electromagnetic clutch to ensure that the motion information of the upper electromagnetic clutch can be accurately captured. The PF encoding reading sensor is closely connected to the PF encoder and reads the encoding information output by the PF encoder in real time through an electrical connection. At the same time, the PF encoding reading sensor also establishes an electrical connection with the controller to promptly transmit the read encoding information to the controller for processing.

[0015] In one embodiment, the paper feeding assembly is specifically designed to include a paper feeding motor and a paper feeding wheel driven by the paper feeding motor. The paper feeding motor serves as a power source and drives the paper feeding wheel to rotate through its rotational motion. The paper feeding wheel is in direct contact with the paper and transmits the paper forward through friction to realize the paper feeding function.

[0016] In one implementation manner, the controller is an Arduino microcontroller, and the Arduino microcontroller is embedded in the rack.

[0017] In a second aspect, a control method for a transmission system for a laser printer is provided.

[0018] This is achieved by using the laser printer transmission system as described above to perform the following steps:

[0019] S1, receiving the clutch information of the upper electromagnetic clutch transmitted by the encoding component; the clutch information is the step length linear motion information when the paper feeding mechanism feeds the paper;

[0020] S2, using the clutch information as a feedback signal, and comparing it with the target speed of the lower electromagnetic clutch 4 to obtain a speed difference e;

[0021] S3, input the speed difference e into the discretized PID controller algorithm to form an electrical signal u(t):

[0022]

[0023] Where: e(k) is the deviation at sampling time k; e(k-1) is the deviation at sampling time k-1; e(j) represents the deviation value at sampling time j; r(j) is the set value (expected value) at sampling time j, and y(j) is the actual value at the same sampling time.

[0024] S4, the controller controls the lower electromagnetic clutch based on the electrical signal u(t).

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. Improve printing quality and speed: By precisely controlling the linear motion of the paper, the technology of the present invention ensures the stable transmission of the paper during the printing process, thereby improving the printing quality. At the same time, the printing speed is also improved accordingly due to the reduction of deviation and jamming during the paper transmission process.

[0027] 2. Effectively reduce paper jams: The technology of the present invention effectively reduces the deviation and misalignment of paper during transmission by real-time capture and reading of the motion information of the upper electromagnetic clutch and precise control of the lower electromagnetic clutch, thereby greatly reducing the probability of paper jams.

[0028] 3. Improve the overall performance and reliability of the printer: By precisely controlling the paper transmission and step linear motion, the technology of the present invention improves the overall performance and reliability of the printer, which helps to extend the service life of the printer and reduce printing interruptions or quality problems caused by transmission system failures.

[0029] 4. Advanced control algorithm achieves precise control: The discrete PID controller algorithm is used to accurately control the step length linear motion of the paper. The technology of the present invention realizes the rapid and accurate adjustment of the lower electromagnetic clutch. It helps to further improve the printing quality and printing speed, and ensure the stability of the paper during the transmission process. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or technical descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0031] Figure 1 It is a three-dimensional schematic diagram of the cooperation between the system of the present invention and the paper feeding mechanism;

[0032] Figure 2 It is a rear view schematic diagram of the system of the present invention;

[0033] Figure 3 It is a schematic diagram of the main view of the system of the present invention;

[0034] Figure 4 It is a schematic side view of the system of the present invention;

[0035] Figure 5 It is a three-dimensional schematic diagram of the system of the present invention.

[0036] Figure numerals: 1. paper feeding mechanism; 2. frame; 3. paper feeding assembly; 301. paper feeding motor; 302. paper feeding wheel; 4. lower electromagnetic clutch; 5. upper electromagnetic clutch; 6. encoding assembly; 601. PF encoder; 602. PF encoding reading sensor; 7. transmission belt assembly; 8. paper feeding wheel. DETAILED DESCRIPTION

[0037] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below;

[0038] Example 1: Please refer to Figures 1 to 5 , this embodiment provides a transmission system for a laser printer:

[0039] Included on frame 2:

[0040] 1) A paper feed assembly 3 for receiving and transporting paper delivered by the laser printer paper feed mechanism 1;

[0041] 2) a clutch assembly for converting the paper into a linear motion with the same step length as when the paper feeding mechanism 1 is feeding;

[0042] 3) an encoding component 6 for acquiring the linear motion information of the step length of the paper fed by the paper feeding mechanism 1;

[0043] 4) and a controller disposed in the frame 2 for receiving information transmitted by the encoding component 6 and controlling the paper feeding component 3 and the clutch component.

[0044] Specifically: The design principle of the transmission system is based on precise paper step control and information feedback mechanism. When the paper feeding mechanism 1 feeds the paper into the printer, the encoding component 6 will start working immediately, obtain the linear motion information of the paper step in real time, and transmit this information to the controller. After receiving this information, the controller will quickly calculate the actual step length of the paper and compare it with the preset step length. If there is a difference, the controller will immediately adjust the working state of the paper feeding component 3 and the clutch component to ensure that the paper maintains the same linear motion step length as when the paper feeding mechanism 1 is delivered during the transmission process. This design principle ensures the stability and accuracy of the paper during the printing process.

[0045] It is understandable that for the above solution: from the application level, the transmission system has brought significant functional improvements to the laser printer. First, it achieves the consistency of the step length of paper during paper feeding and paper feeding, which greatly improves the printing quality and printing speed. Secondly, through precise step length control, the transmission system effectively reduces the occurrence of paper jams and reduces the failure rate of the printer. Finally, the design of the transmission system also takes into account ease of use and maintainability, allowing users to perform maintenance and maintenance more conveniently during use.

[0046] In the technical solution provided in this embodiment, please refer to Figures 2 to 5 The clutch assembly comprises a lower electromagnetic clutch 4 and an upper electromagnetic clutch 5, both of which drive a rubbing wheel and correspond to the upper and lower surfaces of the paper.

[0047] Specifically: The design principle of the clutch assembly is based on the working characteristics of the electromagnetic clutch and the transmission effect of the rubbing wheel. The electromagnetic clutch realizes the clutch function through the principle of electromagnetic induction. When the electromagnet is energized, the clutch closes, the rubbing wheel starts to rotate and drives the paper to move. The lower electromagnetic clutch 4 and the upper electromagnetic clutch 5 correspond to the lower surface and the upper surface of the paper respectively, and work simultaneously to ensure that the paper will not deviate or slip during the transmission process. The transmission effect of the rubbing wheel further enhances the friction between the paper and the transmission channel, so that the paper can be transmitted more stably.

[0048] It should be noted that for the above scheme:

[0049] (1) Lower electromagnetic clutch 4: mainly used to control the downstream part of paper transmission, ensuring that the paper can move linearly according to a predetermined step length during the printing process to achieve accurate printing.

[0050] (2) Upper electromagnetic clutch 5: usually located upstream of the paper feeding mechanism 1, responsible for starting and stopping the paper feeding process to ensure that the paper can enter the printing channel smoothly and accurately.

[0051] After receiving the control signal, the electromagnetic clutch engages or disengages through electromagnetic force, thereby controlling the rotation of the rubbing wheel and further controlling the transmission speed and position of the paper.

[0052] It should be pointed out that the electromagnetic clutch is an automatic electrical device that uses electromagnetic force to control the clutch action and is widely used in various mechanical systems. In the laser printer, the lower electromagnetic clutch 4 and the upper electromagnetic clutch 5 use a micro electromagnetic clutch, which has the advantages of small size, fast response speed, compact structure, etc., and is very suitable for office equipment such as printers. It mainly consists of the following parts:

[0053] (1) Electromagnetic coil: When current passes through, it generates an electromagnetic field, which attracts or releases the armature (or related components), thereby controlling the engagement or disengagement of the clutch.

[0054] (2) Armature (rotor): The part attracted by the electromagnetic coil, connected to the output shaft, used to transmit power.

[0055] (3) Compression spring (return spring): used to return the armature (or rotor) to its original position when the electromagnetic coil is powered off, thereby achieving clutch disengagement.

[0056] Further:

[0057] (1) Lower electromagnetic clutch 4: Based on the clutch information (i.e., the linear motion information of the paper step) transmitted by the encoder component 6, it is compared with the target speed, and the current of the electromagnetic coil is adjusted by the PID controller algorithm disclosed in the second embodiment, so as to accurately control the engagement degree of the lower electromagnetic clutch 4, and ensure that the paper moves linearly according to the predetermined step length. During the printing process, the transmission speed of the paper is adjusted in real time to adapt to different printing requirements and improve the printing quality and speed.

[0058] (2) Upper electromagnetic clutch 5: responsible for starting the paper feeding process. When a print command is received, the electromagnetic coil is energized to generate electromagnetic force, attracting the armature (or related components) to engage the upper electromagnetic clutch 5, thereby starting the paper feeding mechanism 1 to feed the paper into the printing channel. After printing is completed or when paper feeding needs to be stopped, the electromagnetic coil is de-energized, and the armature (or related components) returns to its original position under the action of the compression spring (or return spring), and the upper electromagnetic clutch 5 is disengaged, stopping the paper feeding.

[0059] It can be understood that for the above scheme: from the application level, the design of the clutch assembly brings significant functional improvement to the laser printer. First, through the dual clutch design of the lower electromagnetic clutch 4 and the upper electromagnetic clutch 5, the upper and lower surfaces of the paper are driven and controlled simultaneously, which greatly improves the stability and accuracy of paper transmission. Secondly, the transmission effect of the rubbing wheel effectively enhances the friction between the paper and the transmission channel, reducing the deviation and sliding of the paper during the transmission process.

[0060] In the technical solution provided in this embodiment, please refer to Figures 2 to 5 : It also includes a transmission belt assembly 7, which includes a driving wheel and two driven wheels, wherein the driving wheel and the driven wheel establish a transmission relationship through a belt, and the driven wheel is connected to the lower electromagnetic clutch 4;

[0061] Another driven wheel establishes a transmission relationship with the pickup wheel in the paper feeding mechanism 1 through a belt, that is, the pickup wheel in the paper feeding mechanism 1 is regarded as a driving wheel, and the driven wheel is connected to the upper electromagnetic clutch 5. In this way, the upper electromagnetic clutch 5 receives the paper feeding step linear motion from the paper feeding mechanism 1, and the motion information is captured by the encoding component 6. After the controller calculates, the rotation force of the driving wheel is controlled, and the motion parameters of the lower electromagnetic clutch 4 can be adjusted to be consistent with the upper electromagnetic clutch 5, so as to keep the step linear motion of the paper in the paper feeding process in the paper feeding mechanism 1 consistent. When the step linear motion of the paper output end deviates from the step linear motion of the paper feeding mechanism 1, the system can compensate. The final output paper is received by the paper feeding wheel 8 and transported out of the paper feeding mechanism 1.

[0062] Specifically: The design principle of the transmission belt assembly 7 is based on the stability and accuracy of belt transmission. The driving wheel transmits power to the two driven wheels through the belt, realizing smooth power transmission. At the same time, through the close connection with the lower electromagnetic clutch 4 and the upper electromagnetic clutch 5, the transmission belt assembly 7 can accurately transmit the linear motion information of the paper feeding step of the paper feeding mechanism 1 to the upper electromagnetic clutch 5, and through the capture of the encoding component 6 and the calculation of the controller, realize the precise control of the lower electromagnetic clutch 4. This design principle ensures the consistency and stability of the step length of the paper during the transmission process.

[0063] It can be understood that for the above scheme: from the application level, the introduction of the transmission belt assembly 7 has brought significant functional improvements to the laser printer. First, it realizes the consistency of the step length of the paper during the paper feeding and paper feeding process, which greatly improves the printing quality and printing speed. Secondly, through precise step length control, the transmission system effectively reduces the occurrence of paper jams and reduces the failure rate of the printer. In addition, when the step length linear motion of the paper output end deviates from the step length linear motion of the paper feeding mechanism 1, the system can effectively compensate, further ensuring the stability and accuracy of paper transmission. The final output paper is taken over by the paper feeding wheel 8 and stably transported out of the paper feeding mechanism 1, which provides a strong guarantee for the efficient and stable operation of the laser printer.

[0064] In the technical solution provided in this embodiment, please refer to Figures 2 to 5 : The encoding component 6 includes a PF encoder 601 whose detection section is adapted to the upper electromagnetic clutch 5, and a PF encoding reading sensor 602 electrically connected to the PF encoder 601; the PF encoding reading sensor 602 is electrically connected to the controller.

[0065] Specifically: The design principle of the encoding component 6 is based on the precise measurement of the encoder and the sensitive reading of the sensor. The PF encoder 601 can convert the motion information of the upper electromagnetic clutch 5 into a precise encoding signal in real time through the close cooperation between its detection segment and the upper electromagnetic clutch 5. The PF encoding reading sensor 602 uses its highly sensitive reading ability to capture and analyze the encoding signal output by the PF encoder 601 in real time and convert it into digital information that can be recognized by the controller. After receiving this information, the controller realizes precise control of the linear motion of the paper step through precise calculation and processing.

[0066] It can be understood that for the above scheme: from the application level, the design of the encoding component 6 brings significant functional improvement to the laser printer. First, through the close cooperation of the PF encoder 601 and the PF encoding reading sensor 602, the real-time and accurate capture and reading of the motion information of the upper electromagnetic clutch 5 is achieved, providing accurate data support for the controller. Secondly, the high precision and stability of the encoding component 6 effectively improve the accuracy and reliability of paper transmission and reduce the occurrence of paper jams. Finally, the design of the encoding component 6 also takes into account ease of use and maintainability, allowing users to more conveniently perform maintenance and maintenance during use.

[0067] In the technical solution provided in this embodiment, please refer to Figures 2 to 5 : The paper feeding assembly 3 includes a paper feeding motor 301 and a paper feeding wheel 302 driven by the motor.

[0068] Specifically, the design principle of the paper feed assembly 3 is based on the rotation of the motor and the transmission effect of the wheel. The paper feed motor 301 starts to rotate and generate power by receiving an electrical signal from the controller. This power is transmitted to the paper through the paper feed wheel 302, so that the paper moves forward under the action of friction.

[0069] It can be understood that for the above scheme: from the application level, the design of the paper feed component 3 brings significant functional improvement to the laser printer. First, through the close cooperation of the paper feed motor 301 and the paper feed wheel 302, the stable and uniform transmission of paper is achieved, and the printing quality and printing speed are improved. Secondly, the design of the paper feed component 3 takes into account the ease of use and maintainability, so that the user can perform maintenance and maintenance more conveniently during use. For example, when it is necessary to replace paper or clean the printer, the user can easily disassemble and install the paper feed wheel 302. Finally, the reliability of the paper feed component 3 also provides a strong guarantee for the long-term stable operation of the laser printer.

[0070] In the technical solution provided in this embodiment, please refer to Figures 2 to 5 : The controller is an Arduino microcontroller, which is embedded in the rack 2.

[0071] In summary, in view of the related problems in the conventional technology, this embodiment, based on the above-mentioned transmission system for a laser printer, adopts the following technical means or features to achieve a solution:

[0072] In traditional laser printers, the inconsistent linear motion of paper is mainly caused by the instability and inaccuracy of the transmission system; the technology of this embodiment effectively solves this problem by introducing the encoding component 6, the transmission belt component 7 and the advanced control method.

[0073] The introduction of the encoding component 6 realizes the real-time and accurate capture and reading of the motion information of the upper electromagnetic clutch 5. The PF encoder 601 works closely with the upper electromagnetic clutch 5 to convert its motion information into accurate encoding signals. The PF encoding reading sensor 602 reads these encoding signals in real time and transmits them to the controller. In this way, the controller can accurately obtain the motion state of the upper electromagnetic clutch 5, providing a basis for subsequent precise control. The design of the transmission belt assembly 7 realizes the smooth transmission of power and the maintenance of step linear motion. The driving wheel transmits power to two driven wheels through a belt, one of which is connected to the lower electromagnetic clutch 4, and the other is connected to the paper pickup wheel in the paper feeding mechanism 1. This design ensures the consistency and stability of the step length of the paper during the transmission process.

[0074] Embodiment 2: Based on Embodiment 1, this embodiment further discloses a control method for a transmission system for a laser printer, which is implemented by using the transmission system for a laser printer as described above to perform the following steps:

[0075] S1, receiving the clutch information of the upper electromagnetic clutch 5 transmitted by the encoding component 6; the clutch information is the step length linear motion information when the paper feeding mechanism 1 feeds the paper;

[0076] S2, using the clutch information as a feedback signal, and comparing it with the target speed of the lower electromagnetic clutch 4 to obtain a speed difference e;

[0077] S3, input the speed difference e into the discretized PID controller algorithm to form an electrical signal u(t):

[0078]

[0079] Where: e(k) is the deviation at sampling time k; e(k-1) is the deviation at sampling time k-1; e(j) represents the deviation value at sampling time j; r(j) is the set value (expected value) at sampling time j, and y(j) is the actual value at the same sampling time.

[0080] S4, the controller controls the lower electromagnetic clutch 4 based on the electrical signal u(t).

[0081] Specifically: The principle of this control method is based on the working principle and feedback control mechanism of the PID controller. The PID controller is a commonly used industrial controller that adjusts the deviation of the system through three parameters: proportion (P), integration (I) and differentiation (D) to achieve stable control of the system. In this control method, the clutch information of the upper electromagnetic clutch 5 is used as a feedback signal, which is compared with the target speed of the lower electromagnetic clutch 4 to obtain the speed difference e. This speed difference e reflects the difference between the current system state and the target state. The speed difference e is processed by the PID controller algorithm to form an electrical signal u(t), which is used to control the working state of the lower electromagnetic clutch 4, thereby achieving precise control of the linear motion of the paper step.

[0082] It can be understood that for the above scheme: from the application level, this control method brings significant functional improvements to laser printers. First, by accurately controlling the step length linear movement of the paper, the printing quality and printing speed are improved. Secondly, the control method has good stability and adaptability, and can cope with the challenges brought by different paper materials and weights. In addition, through the precise adjustment of the PID controller, the control method can also effectively reduce the occurrence of paper jams and reduce the failure rate of the printer. Finally, the implementation method of the control method is simple and easy, without the need for a large number of modifications and upgrades to the printer, which reduces the application cost.

[0083] In summary, in view of the related problems in the conventional technology, this embodiment, based on the above-mentioned transmission system for a laser printer and the control method thereof, adopts the following technical means or features to achieve the solution:

[0084] The advanced control method realizes precise control of the lower electromagnetic clutch 4 by processing the clutch information transmitted by the encoding component 6. The controller compares the clutch information with the target speed of the lower electromagnetic clutch 4 to obtain the speed difference e. Then, the speed difference e is input into the discretized PID controller algorithm, and the electrical signal u(t) is formed by adjusting the three parameters of proportion, integration and differentiation. This electrical signal u(t) is used to control the working state of the lower electromagnetic clutch 4, thereby realizing precise control of the linear motion of the paper step length.

[0085] Furthermore, the embedded C language program of the control method provided in this embodiment is as follows, which should be burned into the Arduino microcontroller:

[0086]

[0087]

[0088]

[0089] In the above program:

[0090] The read_serial_data function is used to read the clutch information (actual value) transmitted by the encoding component 6 from the serial port. The PID controller program implements a discretized PID controller by calculating the deviation between the set value and the actual value and calculating the control signal u_t according to the PID parameters (K_p, K_i, K_d). The control_electromagnetic_clutch function is used to control the engagement degree of the electromagnetic clutch 4 according to the control signal u_t.

[0091] The above-mentioned embodiments only express the implementation methods of the relevant practical applications of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A transmission system for a laser printer, characterized in that: include: provided on the frame (2), A paper feeding assembly (3) for receiving and transporting paper delivered by a laser printer paper feeding mechanism (1); A clutch assembly for converting the paper into a linear motion with the same step length as when the paper feeding mechanism (1) feeds the paper; An encoding component (6) for acquiring linear motion information of the step length of the paper fed by the paper feeding mechanism (1); And a controller arranged in the frame (2) and used for receiving information transmitted by the encoding component (6) and controlling the paper feeding component (3) and the clutch component.

2. The transmission system according to claim 1, characterized in that: The clutch assembly comprises a lower electromagnetic clutch (4) and an upper electromagnetic clutch (5), both of which drive a rubbing wheel and correspond to the upper surface and the lower surface of the paper.

3. The transmission system according to claim 2, characterized in that: It also includes a transmission belt assembly (7), the transmission belt assembly (7) includes a driving wheel and two driven wheels, wherein the driving wheel and one of the driven wheels establish a transmission relationship through a belt, and the driven wheel is connected to the lower electromagnetic clutch (4); The other driven wheel establishes a transmission relationship with the paper pickup wheel in the paper feeding mechanism (1) via a belt, and the driven wheel is connected to the upper electromagnetic clutch (5).

4. The transmission system according to claim 2, characterized in that: The encoding component (6) comprises a PF encoder (601) whose detection section is adapted to the upper electromagnetic clutch (5), and a PF encoding reading sensor (602) electrically connected to the PF encoder (601); The PF code reading sensor (602) is electrically connected to the controller.

5. The transmission system according to claim 1, characterized in that: The paper feeding assembly (3) comprises a paper feeding motor (301) and a paper feeding wheel (302) driven by the motor.

6. The transmission system according to any one of claims 1 to 5, characterized in that: The controller is an Arduino microcontroller, and the Arduino microcontroller is embedded in the frame (2).

7. A control method for a transmission system for a laser printer, characterized in that: The method is implemented by using the transmission system according to any one of claims 2 to 6 to perform the following steps: S1, receiving the clutch information of the upper electromagnetic clutch (5) transmitted by the encoding component (6); S2, using the clutch information as a feedback signal, and comparing it with the target speed of the lower electromagnetic clutch (4) to obtain a speed difference e; S3, inputting the speed difference e into a discretized PID controller algorithm to form an electrical signal u(t).

8. The control method according to claim 7, characterized in that: The clutch information is the linear motion information of the step length when the paper feeding mechanism (1) feeds the paper.

9. The control method according to claim 7, characterized in that: In S3, the discretized PID controller algorithm is: Where: e(k) is the deviation at sampling time k; e(k-1) is the deviation at sampling time k-1; e(j) represents the deviation value at sampling time j; r(j) is the set value (expected value) at sampling time j, and y(j) is the actual value at the same sampling time.

10. The control method according to claim 8, characterized in that: Also includes: S4, the controller controls the lower electromagnetic clutch (4) based on the electrical signal u(t).

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