Delay block locking mechanism and automatic pencil sharpener

Abstract

The utility model discloses a time-delay block locking mechanism and an automatic pencil sharpener, and the time-delay block locking mechanism comprises a starting contact block; the limiting piece is in transmission connection with the starting contact block, and the limiting piece moves along with the starting contact block and synchronously moves between a first position and a second position in the vertical direction; and the time delay block can move transversely, the position of the limiting piece at the first position is staggered with the position of the time delay block, and the position of the limiting piece at the second position is locked with the position of the time delay block. According to the delay block locking mechanism provided by the utility model, when the starting contact block is activated, the limiting piece and the starting contact block move synchronously and move between two positions in the vertical direction. The delay block can be unlocked at the first position and locked with the limiting piece at the second position, the positions are stabilized, enough time is provided for operation, the service life is remarkably prolonged, the performance is remarkably improved, and the user experience is optimized.

Description

Technical Field

[0001] The utility model relates to the technical field of automatic pencil sharpeners, and more specifically to a time delay block locking mechanism and an automatic pencil sharpener. Background Art

[0002] CN 117601586 A discloses an electric pencil sharpener, wherein a delayed pencil retraction mechanism is provided in the base thereof; the delayed pencil retraction mechanism comprises a pen tip trigger rod, a delay block and a pencil retraction trigger rod, wherein the pen tip trigger rod and the delay block are transmission-connected; a push surface is provided on the delay block; one end of the pencil retraction trigger rod is arranged on the moving path of the push surface; and a delay interval is provided between the pencil retraction trigger rod and the push surface. In the patent scheme, the delayed pencil retraction mechanism works as follows: utilizing the lateral movement of the delay block, the automatic pencil sharpener is made to transition from a pencil sharpening state of cutting while feeding the pencil to a pencil retraction state through a related transmission structure, and this transition stage is called a delayed pencil sharpening stage, which is used to polish the pencil tip smoothly.

[0003] In order to leave enough time for the pen to be withdrawn, the delay block needs to remain in position for a predetermined period of time. For this reason, a rack locking mechanism is provided in the patent solution. The rack locking mechanism is used as a delay block locking mechanism, but its effective use times are not as expected due to the limitation of the action mode. Therefore, it is necessary to improve the delay block locking mechanism to extend its service life. Summary of the invention

[0004] The utility model aims to solve one of the technical problems in the related art to a certain extent. To this end, the utility model proposes a time-delay block locking mechanism. When the start contact block is activated, the limiter moves synchronously with the start contact block and moves between two positions in the vertical direction. The time-delay block can be unlocked in the first position and locked with the limiter in the second position, stabilizing the position and providing sufficient time for operation, significantly improving the service life and performance, and optimizing the user experience.

[0005] The utility model also provides an automatic pencil sharpener with the time delay block locking mechanism.

[0006] The technical solution adopted by the utility model is to provide a delay block locking mechanism, including:

[0007] Start contact block;

[0008] A limiter, which is in driving connection with the start contact block, and the limiter moves synchronously along the vertical direction between a first position and a second position following the movement of the start contact block;

[0009] The delay block can be moved laterally, the position of the limiting member and the delay block at the first position are staggered, and the position of the limiting member and the delay block at the second position are locked.

[0010] After adopting the above structure, when the starting contact block is activated, the limiter will move synchronously with the starting contact block, and move between the first position and the second position in the vertical direction. The delay block can be unlocked by staggering with the limiter in the first position, and locked with the limiter position in the second position. Through this design, the delay block can maintain a stable position under normal working conditions, thereby providing sufficient time for the pen retracting operation. The life test of the present application scheme and the patent scheme in the background technology found that the service life of the present application scheme was increased by at least 1,000 times, and the service life and performance were significantly improved, providing users with a better quality experience.

[0011] According to an embodiment of the utility model, the delay block has a hook, and the limiting member is provided with a limiting portion corresponding to the hook; in the second position, the hook hooks the limiting portion, thereby locking the position of the limiting member and the delay block in turn.

[0012] According to an embodiment of the utility model, the delay block is installed on the support frame through a third elastic member; the third elastic member is configured to return the delay block to an initial position when the delay block loses the restriction of the limiting member and is unlocked.

[0013] According to one embodiment of the utility model, the limit member is transmission connected to the starting contact block through a linkage rod and a second trigger rod; the starting contact block and the second trigger rod are both used to be installed on the upper cover, and when the upper cover is closed, the linkage rod and the second trigger rod are connected to each other, and the movement of the second trigger rod drives the limit member to move through the linkage rod, thereby completing the transmission connection between the starting contact block and the limit member in turn.

[0014] According to an embodiment of the present utility model, the limiting member has a clamping portion connected to the linkage rod; the limiting member is detachably mounted on the linkage rod through the clamping portion.

[0015] According to an embodiment of the utility model, one end of the linkage rod is connected to the second trigger rod, and the other end is connected to a micro switch; the micro switch is used to control the starter motor to start the automatic pencil sharpener.

[0016] According to an embodiment of the present invention, the limiting member is connected to a second elastic member, and the second elastic member has an elastic tendency to keep the limiting member in the first position.

[0017] An automatic pencil sharpener comprises any one of the above-mentioned delay block locking mechanisms.

[0018] According to one embodiment of the utility model, the automatic pencil sharpener further includes a transmission rod, a sliding gear, a gear set and a turntable, wherein the transmission rod is transmission-connected to the turntable, and the sliding gear is movably mounted on the transmission rod and moves back and forth between a position meshing with a first steering gear in the gear set and a position meshing with a second steering gear.

[0019] According to an embodiment of the utility model, a connecting sleeve connected to the sliding gear is provided on the transmission rod, and a push rod is provided between the connecting sleeve and the delay block. The movement of the delay block drives the sliding gear to move through the push rod and the connecting sleeve in turn. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 This is a schematic diagram of the structure of the automatic pencil sharpener in the embodiment of the utility model after the outer shell is removed;

[0022] Figure 2 This is a top view of the automatic pencil sharpener in the embodiment of the utility model with the outer shell removed;

[0023] Figure 3 for Figure 2 Sectional view along line AA;

[0024] Figure 4 for Figure 2 Sectional view along the midline BB;

[0025] Figure 5 for Figure 2 A cross-sectional view of the automatic pencil sharpener in the initial state along line BB;

[0026] Figure 6 A partial three-dimensional diagram of an automatic pencil sharpener in an embodiment of the utility model;

[0027] Figure 7 It is a partial structural schematic diagram of the automatic pencil sharpener in the embodiment of the utility model;

[0028] Figure 8 This is a schematic diagram of the connection of the upper cover in the embodiment of the utility model;

[0029] Fig. 9 This is a structural schematic diagram of the bottom of the delayed locking mechanism in the embodiment of the utility model;

[0030] Fig.10 A three-dimensional diagram of the time-delay locking mechanism in the embodiment of the utility model;

[0031] Fig.11 It is a three-dimensional diagram of the delay block in the embodiment of the utility model;

[0032] Fig.12 This is a schematic diagram of the structure of the linkage rod in the embodiment of the utility model;

[0033] Fig.13 This is a schematic diagram of the connection of the sliding gear in the embodiment of the utility model;

[0034] Fig.14 It is a three-dimensional diagram of the automatic pencil sharpener in the embodiment of the utility model.

[0035] Description of the numbers in the figure:

[0036] 1. Upper cover; 2. Swing rod; 3. Transmission member; 4. First trigger rod; 5. First elastic member; 6. Transmission rod; 7. Support frame; 8. Sliding gear; 9. Gear set; 10. Linkage rod; 11. Start contact block; 12. Second trigger rod; 13. Limiting member; 14. Tool holder; 15. Pen tip trigger rod; 16. First delay gear; 17. Second delay gear; 18. Delay block; 19. Second elastic member; 20. Motor; 21. Third elastic member; 22. Micro switch; 23. Transmission gear; 24. Ejector rod; 25. Connecting sleeve; 26. Pen feeding assembly; 27. Turntable; 28. Housing; 29. ​​Pen blocking block;

[0037] 9a, first steering gear; 9b, second steering gear; 9c, output gear;

[0038] 11a, guide portion;

[0039] 12a, through groove;

[0040] 13a, limiting portion; 13b, clamping portion;

[0041] 18a, hook; 18b, inclined surface; 18c, rack portion. DETAILED DESCRIPTION

[0042] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0043] In this embodiment, the vertical direction is the vertical direction, with the locking mechanism of the delay block 18 and the pen feeding direction of the automatic pencil sharpener as the vertical direction, and the horizontal direction is a plane perpendicular to the vertical direction. Example

[0044] like Figure 1-13 As shown, in this embodiment, a delay block 18 locking mechanism is disclosed, including:

[0045] Start contact block 11;

[0046] A limiter 13 is connected to the start contact block 11 by transmission, and the limiter 13 moves along with the start contact block 11 and moves vertically between a first position and a second position synchronously;

[0047] The delay block 18 can be moved laterally, the position of the limiting member 13 and the delay block 18 at the first position are staggered, and the position of the limiting member 13 and the delay block 18 at the second position are locked.

[0048] Combination Figure 1 As shown, in this embodiment, the upper cover 1 is spaced apart from the support frame 7, and a portion for cutting pencils is provided between the upper cover 1 and the support frame 7. A knife holder 14 is provided in this portion, and the upper end of the knife holder 14 is rotatably connected to the upper cover 1, and the lower part is connected to a gear set 9 installed on the support frame 7.

[0049] Furthermore, a transmission rod 6, a linkage rod 10, a start contact block 11, a first delay gear 16, a second delay gear 17, a delay block 18, a motor 20 and a micro switch 22 are fixedly mounted on the support frame 7. The transmission rod 6 is elastically mounted on the support frame 7, the limiter 13 is fixedly mounted on the linkage rod 10, the linkage rod 10 is elastically mounted on the support frame 7 through the second elastic member 19, the transmission rod 6 and the linkage rod 10 are arranged in parallel, and both can move vertically relative to the support frame 7.

[0050] Furthermore, combined with Figure 6-7 As shown, the gear set 9 includes a plurality of meshing gears, wherein the rotation directions of each two adjacent meshing gears are opposite, and for this reason, the plurality of gears in the gear set 9 are divided into a first steering gear 9a and a second steering gear 9b according to the direction of rotation. Among them, one gear in the gear set 9 is fixedly mounted on the shaft of the motor 20, and one gear in the gear set 9 is used to be key-connected with the lower end of the tool holder 14, and the gear is called an output gear 9c.

[0051] Furthermore, combined with Figure 5As shown, a pen-blocking block 29 is provided on the tool holder 14, and the pen-blocking block 29 is fixedly connected to the upper end of the pen tip trigger rod 15. The lower end of the pen tip trigger rod 15 passes through the tool holder 14, the output gear 9c and is connected to the first delay gear 16 in sequence, and the second delay gear 17 is fixedly installed at the lower part of the support frame 7. The first delay gear 16 is coaxially keyed with the output gear 9c and can make axial movement relative to the output gear 9c. That is, when the motor 20 drives the tool holder 14 to rotate through the gear set 9, the output gear 9c synchronously drives the first delay gear 16 to rotate, and the downward movement of the pen tip trigger rod 15 can drive the first delay gear 16 to move downward while maintaining rotation, and after moving downward a predetermined distance, it engages with the second delay gear 17. A rack portion 18c is provided on the delay block 18, and the second delay gear 17 always maintains engagement with the rack portion 18c. When the first delay gear 16 drives the second delay gear 17 to rotate, the second delay gear 17 drives the delay block 18 to move laterally through the rack portion 18 c.

[0052] Furthermore, combined with Figure 3 As shown, in this embodiment, the start contact block 11, a pair of swing rods 2, the first trigger rod 4 and the second trigger rod 12 are all movably mounted on the upper cover 1. One of the swing rods 2 is connected to the first trigger rod 4 through a transmission member 3. The transmission member 3 adopts a lever structure, one end of which is connected to the swing rod 2, and the other end is connected to the upper end of the first trigger rod 4. The first trigger rod 4 and the second trigger rod 12 can both move vertically relative to the upper cover 1. The start contact block 11 has an obliquely arranged guide portion 11a, and the upper end of the second trigger rod 12 has a lateral through slot 12a. The guide portion 11a and the through slot 12a cooperate to form an oblique wedge structure, which changes the lateral movement of the start contact block 11 into the vertical movement of the second trigger rod 12. The lower end of the second trigger rod 12 abuts against the upper end of the linkage rod 10. When the pencil is inserted into the pen-feeding channel of the upper cover 1, the pen body drives the start contact block 11 to move outward. During the movement, the start contact block 11 drives the linkage rod 10 to move downward through the second trigger rod 12. The lower end of the linkage rod 10 abuts against the trigger end of the micro switch 22. The movement of the trigger rod triggers the micro switch 22. The motor 20 starts to work, and at the same time, the limit member 13 moves from the first position to the second position, and the second elastic member 19 is compressed.

[0053] Furthermore, combined with Figure 4-5As shown, in this embodiment, the upper cover 1 is also equipped with a pen feeding assembly 26 and a rotating disk 27. The rotating disk 27 is used to drive the pen feeding assembly 26 to feed or retract the pen. The outer edge of the rotating disk 27 is provided with external teeth. A transmission gear 23 is installed on the outer periphery of the rotating disk 27. The transmission gear 23 is rotatably installed on the upper cover 1. The transmission gear 23 is meshed with the rotating disk 27 and the gear portion at the upper end of the transmission rod 6. A sliding gear 8 is movably installed on the transmission rod 6. The sliding gear 8 moves axially with respect to the transmission rod 6 in a transverse direction, and the sliding gear 8 is key-connected with the transmission rod 6. The sliding gear 8 moves back and forth between the position meshed with the first steering gear 9a in the gear set 9 and the position meshed with the second steering gear 9b. When the sliding gear 8 is meshed and connected with the first steering gear 9a or the second steering gear 9b, the power output by the motor 20 is transmitted to the sliding gear 8 through the first steering gear 9a or the second steering gear 9b, and the sliding gear 8 drives the transmission rod 6 to rotate synchronously. The transmission rod 6 drives the turntable 27 to rotate through the transmission gear 23, and the turntable 27 drives the pen feeding assembly 26 to perform the pen feeding and retracting actions.

[0054] Furthermore, in this embodiment, a first elastic member 5 is provided between the pair of swing rods 2, and the first elastic member 5 is a tension spring. The first steering gear 9a in the gear set 9 performs a pen-retracting action corresponding to the pen-feeding assembly 26. The second steering gear 9b performs a pen-feeding action corresponding to the pen-feeding assembly 26.

[0055] Specifically, combined Figure 10-11 As shown, in this embodiment, the delay block 18 has a hook 18a, and the limiter 13 is provided with a limiter portion 13a corresponding to the hook 18a; in the second position, the hook 18a hooks the limiter portion 13a, and the position locking of the limiter 13 and the delay block 18 is realized in turn. A connecting sleeve 25 connected to the sliding gear 8 is provided on the transmission rod 6, and a push rod 24 is provided between the connecting sleeve 25 and the delay block 18. The movement of the delay block 18 drives the sliding gear 8 to move in turn through the push rod 24 and the connecting sleeve 25. The delay block 18 also has a rack portion 18c and an inclined surface 18b. The push rod 24 is movably installed on the support frame 7, and the lower end of the push rod 24 abuts against the surface of the delay block 18, and the upper end abuts against the connecting sleeve 25.

[0056] Furthermore, in this embodiment, the delay block 18 moves laterally under the drive of the second delay gear 17, so that the inclined surface 18b contacts the push rod 24, and the inclined surface 18b continuously pushes the push rod 24 upward, and the push rod 24 drives the connecting sleeve 25 to move upward synchronously. The connecting sleeve 25 drives the sliding gear 8 to move upward along the transmission rod 6, and the sliding gear 8 moves from the meshing position with the second steering gear 9b to the meshing position with the first steering gear 9a.

[0057] Specifically, the limiter 13 has a clamping portion 13b connected to the linkage rod 10; the limiter 13 is detachably mounted on the linkage rod 10 through the clamping portion 13b. The limiter 13 is connected to a second elastic member 19, and the second elastic member 19 has an elastic tendency to keep the limiter 13 in the first position.

[0058] Furthermore, in this embodiment, the action mode of the locking mechanism of the delay block 18 is as follows:

[0059] In the initial state, the sliding gear 8 is meshed and connected with the first steering gear 9a, and the pen-feeding assembly 26 corresponds to the pen-retracting state. When the pencil is fed, the pen tip is inserted into the pen-feeding channel, and the pen tip drives the two swing rods 2 to swing downward synchronously. One of the swing rods 2 drives one end of the transmission member 3 to tilt upward. Correspondingly, the other end of the transmission member 3 is pressed downward to drive the first trigger rod 4 to move downward. The lower end of the first trigger rod 4 abuts against the upper end of the transmission rod 6, thereby driving the transmission rod 6 to move downward, and the transmission rod 6 drives the sliding gear 8 to move downward synchronously, and the sliding gear 8 switches from the position meshed with the first steering gear 9a to the position meshed with the second steering gear 9b. At this time, the pen-feeding assembly 26 switches from the initial pen-retracting state to the pen-feeding state. After that, the pencil feed triggers the starting contact block 11 to move outward, and the starting contact block 11 drives the second trigger rod 12 to move downward through the guide portion 11a, and the second trigger rod 12 drives the linkage rod 10 to move downward synchronously, and the linkage rod 10 triggers the micro switch 22. At the same time, the linkage rod 10 drives the limiter 13 to move downward, and the second elastic member 19 is compressed. The limiter 13 switches from the first position to the second position, and the control circuit receives the signal of the micro switch 22 to make the motor 20 work. At this time, the automatic pencil sharpener enters the pen feeding stage;

[0060] In the pen feeding stage, the motor 20 drives the gear set 9 to work, the second steering gear 9b in the gear set 9 drives the transmission rod 6 to rotate, the transmission rod 6 drives the turntable 27 to rotate through the transmission gear 23, and the turntable 27 drives the pen feeding assembly 26 to work. The pen feeding assembly 26 clamps the pencil body and feeds the pencil toward the tool holder 14. At the same time, the output gear 9c in the gear set 9 drives the tool holder 14 to rotate, and the tool holder 14 and the turntable 27 rotate in the same direction. After the pencil tip enters the tool holder 14, the automatic pencil sharpener enters the pencil sharpening stage;

[0061] During the pencil sharpening stage, the pencil is advanced and the tip is continuously cut by the tool holder 14 until the tip hits the pencil blocking block 29, and the tip drives the pencil blocking block 29 to move downward synchronously. The pencil blocking block 29 drives the first delay gear 16 downward through the tip trigger rod 15. Since the first delay gear 16 is key-connected to the output gear 9c, it always rotates synchronously with the output gear 9c during the pencil sharpening stage. The first delay gear 16 moves downward, switching from a disengaged position to an engaged position with the second delay gear 17, thereby enabling the output gear 9c to drive the second delay gear 17 to rotate through the first delay gear 16. The second delay gear 17 drives the delay block 18 to move horizontally by engaging with the rack portion 18c. During the movement of the delay block 18, its inclined surface 18b drives the push rod 24 to move upward, and the push rod 24 drives the connecting sleeve 25 to move upward, and the connecting sleeve 25 then drives the sliding gear 8 to move upward relative to the transmission rod 6. The sliding gear 8 switches from a position meshing with the second steering gear 9b to a position meshing with the first steering gear 9a, and the gear portion of the transmission rod 6 drives the turntable 27 to rotate in the opposite direction, while the rotation direction of the tool holder 14 remains unchanged, that is, the tool holder 14 and the turntable 27 rotate in the opposite direction. At this time, the pen feed assembly 26 corresponds to the pen retracting state, thereby realizing the reversal of the pen feed assembly 26. The automatic pencil sharpener enters the pen retracting stage; since a third elastic member 21 is provided between the delay block 18 and the support frame 7, the third elastic member 21 is a tension spring. In order to avoid the delay block 18 from retreating immediately, it is difficult to maintain the pen retracting of the pen feed assembly 26 for a sufficient time. After the second delay gear 17 drives the delay block 18 to move a certain distance, the hook 18a engages with the limiting portion 13a on the limiting member 13, and the position of the delay block 18 remains unchanged.

[0062] During the pen retracting stage, the pen feeding assembly 26 continuously drives the pencil to move away from the tool holder 14 to achieve pen retracting. When the pencil leaves the automatic pencil sharpener, the rocker arm 2 automatically resets to the initial position under the action of the first elastic member 5. The starting contact block 11 is reset, and under the action of the second elastic member 19, the push limit member 13 and the linkage rod 10 move up synchronously, and the limit member 13 switches from the second position to the first position. The delay block 18 loses the restriction of the limit member 13 and moves horizontally in the opposite direction under the action of the third elastic member 21. The push rod 24 moves downward accordingly, and the sliding gear 8 loses the restriction of the connecting sleeve 25 and moves downward, and the sliding gear 8 switches from the position meshing with the first steering gear 9a to the position meshing with the second steering gear 9b.

[0063] Combination Fig.14 As shown, in another embodiment, an automatic pencil sharpener is disclosed, comprising a housing 28 and the locking mechanism of the delay block 18 described in this embodiment.

[0064] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0065] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0066] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0067] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0068] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0069] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A time-delay block locking mechanism, characterized in that: include: Start contact block; A limiter, which is in driving connection with the start contact block, and the limiter moves synchronously along the vertical direction between a first position and a second position following the movement of the start contact block; The delay block can be moved laterally, the position of the limiting member and the delay block at the first position are staggered, and the position of the limiting member and the delay block at the second position are locked.

2. The delay block locking mechanism according to claim 1, characterized in that: The delay block has a hook, and the limiting member is provided with a limiting portion corresponding to the hook.

3. The delay block locking mechanism according to claim 1, characterized in that: The delay block is installed on the support frame through a third elastic member.

4. The delay block locking mechanism according to claim 1, characterized in that: The limiting member is transmission-connected to the starting contact block via a linkage rod and a second trigger rod.

5. The delay block locking mechanism according to claim 4, characterized in that: The position-limiting member has a clamping portion connected to the linkage rod.

6. The delay block locking mechanism according to claim 4, characterized in that: One end of the linkage rod is connected to the second trigger rod, and the other end is connected to a micro switch.

7. The delay block locking mechanism according to claim 1, characterized in that: The limiting member is connected to a second elastic member, and the second elastic member has an elastic tendency to keep the limiting member at the first position.

8. An automatic pencil sharpener, characterized in that: It comprises the delay block locking mechanism described in any one of claims 1-7.

9. The automatic pencil sharpener according to claim 8, characterized in that: It also includes a transmission rod, a sliding gear, a gear set and a turntable, wherein the transmission rod is in transmission connection with the turntable, and the sliding gear is movably mounted on the transmission rod and moves back and forth between a position meshing with the first steering gear in the gear set and a position meshing with the second steering gear.

10. The automatic pencil sharpener according to claim 9, characterized in that: The transmission rod is provided with a connecting sleeve connected to the sliding gear, and a push rod is provided between the connecting sleeve and the delay block. The movement of the delay block drives the sliding gear to move through the push rod and the connecting sleeve in turn.

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