Full-automatic pencil sharpener, pencil sharpening method and chip

Abstract

The invention belongs to the technical field of full-automatic pencil sharpeners, and particularly relates to a full-automatic pencil sharpener, a pencil sharpening method and a chip. The full-automatic pencil sharpener comprises a pencil advancing and retreating mechanism, a knife rest assembly, a cutting transmission mechanism, a PCB control module and a braking mechanism, and the cutting transmission mechanism is provided with a pencil advancing and retreating mechanism braking triggering piece and a starting ejector rod; the PCB control module is provided with a pen feeding and retreating mechanism brake switch and a cutting motor starting switch, and the starting ejector rod abuts against the cutting motor starting switch to start the cutting motor; a PCB (Printed Circuit Board) control module, a cutting motor and a brake motor are arranged on the lower sides of the pen feeding and retracting mechanism brake triggering piece and the starting ejector rod; according to the pencil sharpening device, the problem that a pencil is broken during pencil sharpening of the full-automatic pencil sharpener is solved, the pencil sharpening function is achieved through the pencil feeding mechanism and the braking mechanism, the pencil does not move downwards any more, the pencil point is not broken, the pencil sharpening function of the pencil sharpener is better achieved, the smoothness of the sharpening portion of the pencil is improved, and the customer satisfaction degree is improved; the full-automatic pencil sharpener is suitable for an existing full-automatic pencil sharpener, and the pencil sharpening function of the pencil sharpener is optimized.

Description

Technical Field

[0001] The present invention relates to the technical field of pencil sharpeners, and particularly to a fully automatic pencil sharpener, a pencil sharpening method, and a chip. Background Art

[0002] During the process of sharpening a pencil by a fully automatic pencil sharpener, when the pencil tip reaches the required state, the automatic light pen function of the pencil sharpener is activated. In the existing pencil sharpeners, when the knife holder rotates, it will drive the pencil to move downward again and perform cutting again, and the phenomenon of lead breakage at the pencil tip will occur. Therefore, we propose a fully automatic pencil sharpener to solve the above problems. Summary of the Invention

[0003] In view of the above and / or existing problems in a fully automatic pencil sharpener, the present invention is proposed, which can solve the above-mentioned existing problems.

[0004] To solve the above technical problems, according to one aspect of the present invention, the following technical solutions are provided: A fully automatic pencil sharpener includes a pen feeding and retracting mechanism, a knife holder assembly, a cutting transmission mechanism, a PCB control module, and a braking mechanism. The knife holder assembly is provided below the pen feeding and retracting mechanism, the cutting transmission mechanism is provided below the knife holder assembly, an actuating trigger for the pen feeding and retracting mechanism braking and a starting ejector rod are provided on the cutting transmission mechanism, a braking switch for the pen feeding and retracting mechanism and a starting switch for the cutting motor are provided on the PCB control module, and the starting ejector rod abuts against the starting switch for the cutting motor to start the cutting motor; below the actuating trigger for the pen feeding and retracting mechanism braking and the starting ejector rod, there are a PCB control module, a cutting motor, and a braking motor; The starting ejector rod abuts against the PCB control module through the pen inserted into the pen feeding and retracting mechanism to start the cutting motor. The cutting motor, the cutting transmission mechanism, the knife holder assembly, and the pen feeding and retracting mechanism are connected in sequence, so that the pen automatically enters the cutting; When the pen continues to enter the knife holder assembly, the actuating trigger for the pen feeding and retracting mechanism braking abuts against the PCB control module, and the PCB control module starts the braking motor. The braking motor, the threaded gear, the braking mechanism, and the pen feeding and retracting mechanism are connected in sequence, so as to brake the pen feeding and retracting mechanism.

[0005] Further, the braking mechanism includes a brake sliding rack, a brake ejector rod, and a threaded gear. The threaded gear is connected to the gear on the braking motor. The threaded gear is provided with a brake ejector rod, and the brake ejector rod is lifted and lowered through the transmission of the threaded gear and the gear on the braking motor to engage and disengage with the brake sliding rack; springs are respectively provided on both sides of the brake sliding rack.

[0006] Further, the pen advancing and retracting mechanism includes two rotating shafts, on which are respectively provided two bracket rubber rollers for clamping and moving the pen in and out. Bracket gears are respectively provided on the two rotating shafts, and the two bracket gears are engaged with a bracket gear disc. Two fixed gears are also respectively provided on the two rotating shafts, and the two fixed gears are fixedly engaged with a brake sliding rack. The braking motor drives the brake sliding rack to engage with the two fixed gears, thereby braking the pen advancing and retracting mechanism.

[0007] Further, the threaded gear is provided with an internal thread, and the brake ejector rod is provided with an external thread. The internal thread has a height H1 in the height direction, and the distance between the brake sliding rack and the brake ejector rod in the height direction is H2, and H1 ≤ H2; The forward and reverse rotation of the braking motor drives the threaded gear to lift the brake ejector rod under the cooperation of the internal thread and the external thread, so as to lift the brake sliding rack.

[0008] Further, the pen advancing and retracting mechanism braking trigger includes a pen tip ejector rod and a pen tip bracket connected together. The pen tip ejector rod abuts against a pen tip touch switch to start the braking motor. A cutting cavity is provided in the tool rest assembly, and a pen tip bracket is provided in the cutting cavity; A chip is provided on the PCB control module, and the chip is respectively connected to the cutting motor and the braking motor by lines.

[0009] A full-automatic pencil sharpening method. After the pen enters the pen advancing and retracting mechanism in sequence, the cutting motor start switch starts the cutting motor. The cutting motor drives the tool rest assembly through a cutting transmission mechanism, and the tool rest assembly drives the pen advancing and retracting mechanism, so that the pen continuously enters the tool rest assembly while being cut; The pen continuously enters until it touches the pen advancing and retracting mechanism braking switch on the PCB control module through the pen advancing and retracting mechanism braking trigger. The pen advancing and retracting mechanism braking switch starts the braking motor to brake the pen advancing and retracting mechanism through a braking mechanism, so that the pen stops entering the tool rest assembly, and the PCB control module controls the cutting motor to continue cutting in the pen stop state; After the cutting is completed in the pen stop state, the PCB control module controls the cutting motor and the braking motor to reverse simultaneously, and the braking mechanism is disengaged from the pen advancing and retracting mechanism, so that the pen exits the pen advancing and retracting mechanism.

[0010] Further, the braking mechanism is a split type. The braking motor drives the threaded gear, the brake ejector rod, and the brake sliding rack to move upward in sequence. When the brake sliding rack moves upward and engages with the fixed gear, the pen advancing and retracting mechanism is braked.

[0011] Further, the depth of the pen continuously entering the cutting cavity of the tool rest assembly is limited by the pen advancing and retracting mechanism braking trigger.

[0012] Further, when the braking switch of the retracting and extending pen mechanism starts to brake the retracting and extending pen mechanism, the PCB control module controls the cutting motor to calculate the cutting time T1 of the pen in the stopped state, and the cutting time T1 is controlled within 0 - 5 seconds; After the cutting time T1 of the pen ends, the PCB control module controls the cutting motor and the braking motor to reverse and retract the pen simultaneously, and the retracting time T2 is controlled within 0 - 5 seconds.

[0013] A chip includes a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the computer program, the method of any one of the above is implemented.

[0014] Compared with the prior art: The present invention solves the problem of pen breakage during pencil sharpening of a fully automatic pencil sharpener. When realizing the light pen function through the pen feeding mechanism and the braking mechanism, the pencil no longer moves downward and the pen tip is not broken, better realizing the light pen function of the sharpener, improving the smoothness of the cutting part of the pencil, and enhancing customer satisfaction.

[0015] The present invention is suitable for existing fully automatic pencil sharpeners and optimizes their light pen functions. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural diagram of the present invention Figure 1 ; Figure 2 is Figure 1 a cross-sectional view of; Figure 3 is a schematic structural diagram of the present invention Figure 2 ; Figure 4 is a schematic structural diagram of the present invention Figure 3 ; Figure 5 is a schematic structural diagram of the pen feeding mechanism and the braking mechanism in the present invention; Figure 6 is a schematic structural diagram of the PCB control module in the present invention; Figure 7 is a schematic structural diagram of the brake ejector rod in the present invention; Figure 8 is a schematic structural diagram of the transmission shaft in the retracting and extending pen mechanism of the present invention; Figure 9 is a schematic structural diagram of the cutting transmission mechanism in the present invention; Figure 10 is a schematic structural diagram of the pen tip bracket in the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] To make the objectives, technical solutions, and advantages of the present invention clearer, the following will be combined with the attached Figures 1 - 10A further detailed description of the embodiments of the present invention will be given.

[0018] The present invention provides a fully automatic pencil sharpener, the purpose of which is to better realize the light pen function of the pencil sharpener when sharpening a pencil, prevent the occurrence of broken pencil tips, improve the smoothness of the pencil cutting part, and improve customer satisfaction.

[0019] According to an embodiment, the fully automatic pencil sharpener includes a pen advancing and retracting mechanism 1, a tool holder assembly 5, a cutting transmission mechanism 17, a PCB control module 18 and a braking mechanism. In terms of the connection method, the pen advancing and retracting mechanism 1 is connected to the tool holder assembly 5 below. The tool holder assembly 5 includes a hob holder body 51 and a hob 52 obliquely arranged with the hob holder body 51. The pen enters the cutting cavity 53 in the middle of the hob holder body 51 from the pen advancing and retracting mechanism 1 and is cut in a circular motion by the hob 52. The obliquely arranged hob 52 cuts the end of the pen into a conical shape. The start of cutting is as follows: The pen advancing and retracting mechanism 1 includes two rotating shafts 3. Two support rubber rollers 10 for clamping the pen and moving in and out under relative rotational friction are respectively arranged on the two rotating shafts 3. Two support gears 2 are respectively arranged on the two support rubber rollers 10. A friction adjusting block 23 is closely arranged against the two support gears 2 for adjusting the friction of this assembly. The two support gears 2 are engaged with a support gear disc 4. As long as the support gear disc 4 rotates, it can drive the two support gears 2, thereby driving the two support rubber rollers 10 to rotate relatively. Thus, the support gear disc 4 is connected to the tool holder assembly 5. The tool holder assembly 5 is connected to the cutting transmission mechanism 17 below. A starting ejector rod 8 is connected to the cutting transmission mechanism 17. A cutting motor starting switch 9 is arranged below the starting ejector rod 8; Figure 1 Figure 2 Taking the [specific state] as an example, the pen is inserted between the two support rubber rollers 10 of the pen advancing and retracting mechanism 1, and the tool holder assembly 5 will move downward. For the part where the tool holder assembly 5 moves downward, please refer to the content of the utility model patent with the name of a pen clamping mechanism for large and small pens and the authorization announcement number of CN222080439U. Therefore, the downward movement of the tool holder assembly 5 causes the starting ejector rod 8 to move downward and abut against the cutting motor starting switch 9 to start the cutting motor 19; the cutting motor 19 is driven by the cutting transmission mechanism 17. The cutting transmission mechanism 17 is a gear module connected by gears with different diameters. The cutting transmission mechanism 1 drives the tool holder assembly 5 and the support gear disc 4, so that the pen is clamped by the relative rotation of the two support rubber rollers 10 and moves downward while the hob 52 cuts around the pen.

[0020] When the pen moves downward into the cutting cavity 53 and the hob 52 cuts around the pen at the same time, the situation of broken pen may occur. Therefore, when the pen enters a certain depth, it needs to stop in the cutting cavity 53 and be cut again, so as not to cause a broken pen. Some of the embodiments are as follows: On the gear module 17, there is a braking trigger part for the pen retracting and extending mechanism. Part of this braking trigger part extends into the cutting chamber 53, and part extends outwards and is exposed below the gear module 17 of the cutting chamber 53. Below the braking trigger part of the pen retracting and extending mechanism and the starting ejector rod 8, there are a PCB control module 18, a cutting motor 19, and a braking motor 15; on the PCB control module 18, there are a braking switch 7 for the pen retracting and extending mechanism and a starting switch 9 for the cutting motor. When the cutting transmission mechanism 1 moves downward until it abuts against the braking switch 7 of the pen retracting and extending mechanism, the braking motor 15 is started. The braking motor 15, the threaded gear 14, the braking mechanism, and the pen retracting and extending mechanism 1 are connected in sequence, thereby braking the pen retracting and extending mechanism 1.

[0021] In some further embodiments, fixed gears 11 are respectively provided at the outer ends on the same side of the two rotating shafts 3 of the pen retracting and extending mechanism 1. The braking mechanism includes a braking sliding rack 12, and springs 16 are respectively provided on both sides of the braking sliding rack 12. When the braking sliding rack 12 is movable, the braking ejector rod 13 is lifted and lowered through the gear transmission on the threaded gear 14 and the braking motor 15 to engage and disengage with the braking sliding rack 12; in Figure 3 the setting mode as described above, the braking sliding rack 12 moves up and down. The threaded gear 14 is driven by the braking motor 15 to move upward. The threaded gear 14 drives the braking sliding rack 12 of the braking mechanism to move upward. When it moves to engage with the fixed gear 11, the pen retracting and extending mechanism 1 is braked.

[0022] In some further embodiments, the braking mechanism is split-type and includes a braking ejector rod 13. The threaded gear 14 is provided with an internal thread, and the braking ejector rod 13 is provided with an external thread. The braking ejector rod 13 is installed on the threaded gear 14 through the cooperation of the internal thread and the external thread. In its movement process, the braking motor 15 drives the threaded gear 14. The threaded gear 14 drives the braking ejector rod 13 through the internal thread structure. After the braking ejector rod 13 moves upward until the thread disengages from the threaded gear 14 and contacts the braking sliding rack 12, it drives the braking sliding rack 12 to move upward together, causing the braking sliding rack 12 to engage with the fixed gear 11, preventing the two rotating shafts 3 from rotating further, playing a braking role, and preventing the pencil from moving downward further.

[0023] In some further embodiments, the internal thread has a height H1 in the height direction, and the distance between the braking sliding rack 12 and the braking ejector rod 13 in the height direction is H2, and H1 ≤ H2. This height setting ensures that the braking sliding rack 12 engages with the fixed gear 11. The forward and reverse rotation of the braking motor 15 drives the threaded gear 14 to lift and lower the braking ejector rod 13 under the cooperation of the internal thread and the external thread, causing the braking sliding rack 12 to lift and lower.

[0024] In some embodiments, the braking trigger member of the pen advancing and retracting mechanism includes a pen tip ejector rod 6 and a pen tip bracket 21 connected to each other. The pen tip bracket 21 is installed in the cutting chamber 53. When the cutting angle of the hob 52 is fixed, the cutting thickness of the pen tip is determined by the installation condition of the pen tip bracket 21 in the cutting chamber 53. When the height of the pen tip bracket 21 is relatively low, the pen tip will be thinner and longer when it touches the pen tip bracket 21, which may cause the pen tip to break. Therefore, sufficient margin is often left in the design to prevent the pen tip from being too thin and long. After braking, a light pen action is performed to achieve a better light pen function of the pencil sharpener, improve the smoothness of the cutting part, and enhance customer satisfaction.

[0025] In some embodiments, in order to better control the light pen and the smoothness of the cutting part, a chip 20 is provided on the PCB control module 18. The chip 20 is respectively connected to the cutting motor 19 and the braking motor 15 by circuits. When the braking and advancing / retracting pen mechanism 1 is braked by starting the braking switch 7 of the advancing / retracting pen mechanism, the chip 20 starts to calculate the time. After the light pen action is completed, the chip 20 controls the cutting motor 19 and the braking motor 15 to reverse simultaneously. The reverse rotation of the braking motor 15 drives the threaded gear 14 to reverse. The reverse rotation of the threaded gear 14 moves the brake ejector rod 13 downward. The brake sliding rack 12 moves downward to reset under the action of the spring 16 and disengages from the fixed gear 11, playing a role in releasing the brake. This is the action of automatically retracting the pen, and the retracting time also needs to be calculated.

[0026] The present invention also discloses a cutting method based on the above full-automatic pencil sharpener. One of the embodiments is as follows: The pen sequentially enters the advancing / retracting pen mechanism 1 and touches the cutting motor start switch 9 on the PCB control module 18 within the tool rest assembly 5. The cutting motor starts the cutting motor 19 to drive the tool rest assembly 5 through the cutting transmission mechanism 17. The tool rest assembly 5 drives the advancing / retracting pen mechanism 1 to continuously move the pen into the tool rest assembly 5 while cutting. The pen continuously enters until it touches the braking switch 7 of the advancing / retracting pen mechanism on the PCB control module 18 through the braking trigger member of the advancing / retracting pen mechanism. The braking switch 7 of the advancing / retracting pen mechanism starts the braking motor 15, and brakes the advancing / retracting pen mechanism 1 through the braking mechanism. The pen stops entering the tool rest assembly 5, and the cutting motor 19 continues to cut in the stopped state of the pen. After the cutting is completed in the stopped state of the pen, the PCB control module 18 controls the cutting motor 19 and the braking motor 15 to reverse simultaneously. The braking mechanism disengages from the advancing / retracting pen mechanism 1, and the pen exits the advancing / retracting pen mechanism 1.

[0027] In a further embodiment, the braking mechanism is a split type. The braking motor 15 drives the threaded gear 14 to move upward. The threaded gear 14 drives the brake push rod 13 to move upward. The brake push rod 13 abuts against the brake sliding rack 12 and drives it to move upward. When the brake sliding rack 12 moves upward and meshes with the fixed gear 11, the pen advancing and retracting mechanism 1 is braked.

[0028] In a further embodiment, the depth that the pen continuously advances into the conical cutting cavity 53 of the tool rest assembly 5 is limited by the pen advancing and retracting mechanism braking trigger.

[0029] In a further embodiment, the pen advancing and retracting mechanism braking trigger is the connected pen tip push rod 6 and pen tip bracket 21.

[0030] In some embodiments, when the pen advancing and retracting mechanism 1 is braked by starting from the pen advancing and retracting mechanism braking switch 7, the PCB control module 18 controls the cutting motor 19 to calculate the cutting time of the pen in the stopped state as T1, and the cutting time T1 is controlled within 0 - 5 seconds; After the cutting time T1 of the pen ends, the PCB control module 18 controls the cutting motor 19 and the braking motor 15 to reverse and retract the pen simultaneously, and the retracting time is T2, and T2 is controlled within 0 - 5 seconds.

[0031] The present invention also discloses a chip 20, including a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the computer program, the above-mentioned cutting method is implemented.

[0032] The present invention realizes full automation when the pen advancing touches the starting push rod 8, which is simple and convenient, not easy to break the pen tip, and improves the smoothness of the cutting part.

[0033] Although the present invention has been described above with reference to the embodiments, various improvements can be made to it and components therein can be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the various features in the embodiments disclosed in the present invention can be combined with each other in any way. The exhaustive description of these combinations is not given in this specification only for the sake of saving space and resources. Therefore, the present invention is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A fully automatic pencil sharpener, characterized in that: It includes an advance and retreat pen mechanism, a tool holder assembly, a cutting transmission mechanism, a PCB control module and a braking mechanism. The tool holder assembly is provided below the advance and retreat pen mechanism, the cutting transmission mechanism is provided below the tool holder assembly, the advance and retreat pen mechanism braking trigger and a starting push rod are provided on the cutting transmission mechanism, the advance and retreat pen mechanism braking switch and a cutting motor starting switch are provided on the PCB control module, and the starting push rod abuts against the cutting motor starting switch to start the cutting motor; the PCB control module, the cutting motor and the braking motor are provided on the lower side of the advance and retreat pen mechanism braking trigger and the starting push rod; The starting ejector starts the cutting motor by inserting the pen into the pen advance and retreat mechanism and abutting against the PCB control module. The cutting motor, the cutting transmission mechanism, the tool holder assembly and the pen advance and retreat mechanism are connected in sequence, so that the pen automatically enters the cutting process; The brake trigger of the pen advance and retract mechanism abuts against the PCB control module when the pen continues to enter the tool holder assembly. The PCB control module starts the brake motor, and the brake motor, threaded gear, brake mechanism, and pen advance and retract mechanism are connected in sequence, thereby braking the pen advance and retract mechanism.

2. A fully automatic pencil sharpener according to claim 1, characterized in that: The brake mechanism includes a brake sliding rack, a brake push rod and a threaded gear. The threaded gear is connected to the gear on the brake motor. The threaded gear is provided with a brake push rod. The brake push rod is raised and lowered by the threaded gear and the gear on the brake motor to engage and disengage with the brake sliding rack. Springs are provided on both sides of the brake sliding rack.

3. A fully automatic pencil sharpener according to claim 2, characterized in that: The pen advancing and retracting mechanism includes two rotating shafts, on which are respectively provided two bracket rubber rollers for clamping the pen in and out, and on which are respectively provided bracket gears, which are meshed with the bracket gear discs. Two fixed gears are also respectively provided on the two rotating shafts, which are meshed and fixed with the brake sliding racks, and the brake motor drives the brake sliding racks to mesh with the two fixed gears, thereby braking the pen advancing and retracting mechanism.

4. A fully automatic pencil sharpener according to claim 2, characterized in that: The threaded gear is provided with an internal thread, the brake top rod is provided with an external thread, the internal thread has a height H1 in the height direction, the brake sliding rack and the brake top rod are separated by a distance H2 in the height direction, and H1≤H2; The brake motor rotates forward and reversely to drive the threaded gear to lift the brake push rod under the cooperation of the internal thread and the external thread, so that the brake sliding rack can be lifted or lowered.

5. The fully automatic pencil sharpener according to claim 1, characterized in that: The brake trigger of the pen advance and retract mechanism includes a connected pen tip push rod and a pen tip bracket, the pen tip push rod abuts against the pen tip touch switch to start the brake motor, the tool holder assembly is provided with a cutting chamber, and the cutting chamber is provided with a pen tip bracket; The PCB control module is provided with a chip, and the chip is connected to the cutting motor and the brake motor circuits respectively.

6. A fully automatic pencil sharpening method, characterized in that: After the pen enters the pen advance and retreat mechanism in sequence, the cutting motor start switch starts the cutting motor, and the cutting motor drives the tool holder assembly through the cutting transmission mechanism, and the tool holder assembly drives the pen advance and retreat mechanism, so that the pen continues to enter the tool holder assembly while cutting the pen; The pen continues to enter until it touches the brake switch of the pen advance / retract mechanism on the PCB control module through the brake trigger of the pen advance / retract mechanism. The brake switch of the pen advance / retract mechanism starts the brake motor to brake the pen advance / retract mechanism through the brake mechanism, so that the pen stops entering the tool holder assembly. When the pen stops, the PCB control module controls the cutting motor to continue cutting. After the pen has finished cutting in the stopped state, the PCB control module controls the cutting motor and the brake motor to reverse at the same time, and the brake mechanism is disengaged from the pen advance and retreat mechanism, so that the pen withdraws from the pen advance and retreat mechanism.

7. A fully automatic pencil sharpening method according to claim 6, characterized in that: The brake mechanism is a split type, and the brake motor drives the threaded gear, the brake push rod, and the brake sliding rack to move upward in sequence. When the brake sliding rack moves upward and meshes with the fixed gear, the advance and retreat pen mechanism is braked.

8. A fully automatic pencil sharpening method according to claim 6, characterized in that: The depth of the pen continuously entering the cutting chamber of the tool holder assembly is limited by the brake trigger of the pen advance and retract mechanism.

9. A fully automatic pencil sharpening method according to claim 6, characterized in that: When the brake switch of the pen advance and retreat mechanism is started, the PCB control module controls the cutting motor to calculate the cutting time T1 of the pen in the stopped state, and the cutting time T1 is controlled within 0-5 seconds; After the pen cutting time T1 is over, the PCB control module controls the cutting motor and the brake motor to reverse and retract the pen at the same time, and the retraction time T2 is controlled within 0-5 seconds.

10. A chip, characterized in that: The method comprises a memory, a processor and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the method according to any one of claims 6 to 9 is implemented.

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