An adjustable pen clamping gap structure and a pen sharpener incorporating the structure.

Abstract

This invention discloses an adjustable pen clamping gap structure and a pencil sharpener using this structure. The adjustable pen clamping gap structure includes a pencil sharpening assembly, a pen advance / retractor assembly, and a support. A first pen advance / retractor roller and / or a second pen advance / retractor roller move relative to the support at a first height position and a second height position. The maximum pen clamping gap between the first and second pen advance / retractor rollers at the first height position is different from the maximum pen clamping gap at the second height position. A blade holder drives a turbine to move axially, and the turbine abuts against both the first and second pen advance / retractor rollers to keep them at any height position. This invention provides an adjustable pen clamping gap structure that arranges the first pen advance / retractor roller, the second pen advance / retractor roller, the turbine, and the pencil sharpening assembly to be adjustable in the height direction, with different maximum pen clamping gaps at different height positions, thereby achieving the purpose of adjustable pen clamping gap.

Description

Technical Field

[0001] This invention relates to the field of pencil sharpener feeding structure technology, and more specifically, to a pencil clamping gap adjustable structure and a pencil sharpener using the structure. Background Technology

[0002] The working steps of an automatic pencil sharpener are roughly as follows: First, the pencil is inserted into the pencil inlet hole on the housing. A micro switch is triggered by a linkage structure. Then, the control circuit controls the motor to work. The motor drives the blade holder to rotate via a reduction gear set. The blade holder drives the turbine at its upper end to rotate. The turbine drives two advance and retract rollers to rotate synchronously and in opposite directions. Located below the pencil inlet hole, they drive the pencil in. After the pencil tip has been sharpened, the blade holder rotates in the opposite direction, repeating the above steps. The two advance and retract rollers drive the pencil out.

[0003] Chinese utility model patent CN210502034U discloses an automatic pen feeding mechanism, including a pen feed cap, a base, a pen feeding assembly, and a turbine. The base includes a bottom surface, a first side surface, and a second side surface. The turbine is connected to the pen feeding assembly and is connected to the bottom surface of the base. The pen feed cap covers the base, and a spring mechanism is connected to the bottom surface of the base. The other end of the spring mechanism is connected to the pen feeding assembly. In this patent, the maximum pen-clamping capacity of the pen feeding assembly depends on the maximum width between the second and third connecting ports. That is, when the second impeller shaft abuts against the outermost wall surface inside the inclined third connecting port, the first rubber roller located on the first impeller shaft that mates with the second connecting port, together with the second rubber roller located on the second impeller shaft, constitutes the maximum pen-clamping gap of the pen feeding assembly.

[0004] For the aforementioned patents, or designs like CN 208359795 U that use a blade holder to drive a pen feed assembly via a turbine transmission to perform pen feed and retraction actions, the maximum pen clamping gap is fixed and cannot be adjusted. When the pencil body to be sharpened is larger than the maximum pen clamping gap, the pen feed assembly cannot work properly. Summary of the Invention

[0005] This invention aims to at least partially solve one of the technical problems in related technologies. To this end, this invention proposes an adjustable pen clamping gap structure, in which a first pen-advancing roller, a second pen-advancing roller, a turbine, and a pen-sharpening assembly are configured to be adjustable in the height direction, with different maximum pen clamping gaps at different height positions, thereby achieving the purpose of adjustable pen clamping gap.

[0006] The present invention also proposes a pencil sharpener with an adjustable clamping gap structure.

[0007] The technical solution adopted by the present invention is: to provide a pen clamping gap adjustable structure, including a pen sharpening assembly, a pen advance and retraction assembly and a bracket, wherein the pen advance and retraction assembly includes a turbine, a first pen advance and retraction roller and a second pen advance and retraction roller mounted on the bracket, the first pen advance and retraction roller and the second pen advance and retraction roller are arranged in parallel and both are meshed with the turbine, and the blade holder on the pen advance and retraction assembly is connected to the turbine shaft;

[0008] The first and / or the second advance and retract pen rollers move relative to the bracket at a first height position and a second height position, and the maximum pen clamping gap between the first and second advance and retract pen rollers at the first height position is not equal to the maximum pen clamping gap at the second height position. The blade holder drives the turbine to move axially, and the turbines abut against the first and second advance and retract pen rollers, so that the first and second advance and retract pen rollers are held at the first height position, the second height position, or any position between the first and second height positions.

[0009] With the above structure, the first and second advance / retractor rollers move between a first and a second height position, switching back and forth between different maximum clamping gaps, suitable for clamping various pencils of different thicknesses. To keep the advance / retractor assembly at the same height for extended periods, the entire pencil sharpening assembly is configured to be movable relative to the support along the height direction. The blade holder in the sharpening assembly drives the turbine to move synchronously. The turbine maintains engagement with both the first and second advance / retractor rollers while also providing support in the height direction. Compared to existing technologies, this invention, based on the design of using a blade holder to drive the advance / retractor assembly via a turbine transmission, also achieves adjustable maximum clamping gaps, increasing the applicability of the pencil sharpener.

[0010] According to one embodiment of the present invention, the bracket is provided with two first mounting grooves and two second mounting grooves. The two ends of the first advance and retract pen roller are respectively slidably engaged with the two first mounting grooves, and the two ends of the second advance and retract pen roller are respectively slidably engaged with the two second mounting grooves. With the above arrangement, the two ends of the first advance and retract pen roller can rotate relative to the first mounting grooves, and can also move up and down along the height direction.

[0011] According to one embodiment of the present invention, the outer side wall of the first mounting groove and the outer side wall of the second mounting groove are arranged in a V-shape or an inverted V-shape; with the above arrangement, when the first pen advance roller and the second pen advance roller move between the first height position and the second height position, the maximum pen clamping gap between them gradually increases or decreases along the height direction.

[0012] According to one embodiment of the present invention, the adjustable pen clamping gap structure further includes a housing, wherein both the first mounting groove and the second mounting groove have upward openings, and the upper cover of the housing extends downward to form a limiting protrusion; the limiting protrusion and the first mounting groove combine to form a space for the first advance / retract pen roller to move between a first height position and a second height position, and similarly the limiting protrusion and the second mounting groove combine to form a space for the second advance / retract pen roller to move between the first height position and the second height position.

[0013] According to one embodiment of the present invention, the upper cover is elastically connected to the first advance / retractable pen roller and / or the second advance / retractable pen roller; that is, an elastic element is provided between the upper cover and the first advance / retractable pen roller and / or the second advance / retractable pen roller, the elastic element having an elastic tendency to bring the first advance / retractable pen roller and the second advance / retractable pen roller closer to each other, so as to provide a clamping force between the first advance / retractable pen roller and the second advance / retractable pen roller for clamping the pen body.

[0014] According to one embodiment of the present invention, the turbine is provided with an annular boss, and the rubber rollers on the first and / or second pen rollers abut against the annular boss; the contact area between the rubber rollers and the annular boss is large, so that the first and / or second pen rollers are subjected to force evenly, which can reduce or replace the force between the impeller and the turbine on the first and / or second pen rollers.

[0015] A pencil sharpener comprising the adjustable clamping gap structure of any of the above embodiments.

[0016] According to one embodiment of the present invention, a drive assembly is installed inside the housing of the pencil sharpener. The drive assembly includes a motor and a reduction gear set. The output gear in the reduction gear set is connected to the blade holder in the pencil sharpener via a coupling in a torque-transmitting manner. The reduction gear set is used to convert the high-speed, low-torque output of the motor into low-speed, high-torque output.

[0017] According to one embodiment of the present invention, the output gear is capable of moving along its axial direction relative to another gear in the reduction gear set that meshes with the output gear, and maintaining engagement; that is, while maintaining engagement with the other gear, the output gear can also move along its own axial direction, and the movement of the output gear drives the tool holder to move through the coupling.

[0018] According to one embodiment of the present invention, a dial wheel is provided inside the housing. The dial wheel has a helical surface on the side facing the cutter holder, and the helical surface abuts against the trigger rod of the output gear. With this configuration, rotating the dial wheel drives the output gear to move up and down via the trigger rod. The output gear, in turn, drives the first and / or second advance / retractable pen rollers via a coupling, the cutter holder, and a worm gear. In the prior art, the dial wheel and trigger rod are used to adjust the height of the pen stop block relative to the cutter holder, thereby adjusting the thickness of the pen tip cut by the sharpening assembly. In this invention, the dial wheel and trigger rod are used to adjust the overall height of the sharpening assembly, thereby using the sharpening assembly to drive the first and / or second advance / retractable pen rollers. The transmission part of the sharpening assembly maintains transmission during up and down movement; for example, the hob and its meshing gear ring can move synchronously, or the hob maintains meshing while moving up and down relative to the gear ring.

[0019] According to one embodiment of the present invention, the housing is provided with an adjustment knob that engages with the dial wheel, and part of the adjustment knob is exposed on the surface of the housing to form an adjustable part; by rotating the adjustment knob through the adjustable part on the surface of the housing, the adjustment knob drives the dial wheel to rotate, thereby realizing the switching of different pen clamping gaps. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the pencil sharpener in an embodiment of the present invention;

[0022] Figure 2 This is a top view of the pencil sharpener in an embodiment of the present invention;

[0023] Figure 3 for Figure 2 Full sectional view of line AA in the middle;

[0024] Figure 4 for Figure 3 A magnified view of a section at point C;

[0025] Figure 5 for Figure 2 Full cross-section of the middle BB line;

[0026] Figure 6 This is a schematic diagram of the structure of the pencil sharpening component in an embodiment of the present invention;

[0027] Figure 7This is a schematic diagram of the pencil sharpening assembly after removing the roller cutter in an embodiment of the present invention;

[0028] Figure 8 This is a perspective view of the adjustable pen clamping gap structure in an embodiment of the present invention;

[0029] Figure 9 This is a schematic diagram of the connection of the adjustable pen clamping gap structure in an embodiment of the present invention;

[0030] Figure 10 This is a schematic diagram of the connection of the pencil sharpening structure in an embodiment of the present invention;

[0031] Figure 11 for Figure 10 A bottom view of the structure of a medium-sized pencil.

[0032] Figure 12 for Figure 11 A cross-sectional view of the CC line;

[0033] Figure 13 This is a perspective view of the bracket in an embodiment of the present invention;

[0034] Figure 14 This is a bottom view of the upper cover in the housing in an embodiment of the present invention;

[0035] Figure 15 This is a structural diagram of the adjustable pen clamping gap structure in an embodiment of the present invention;

[0036] Figure 16 This is a perspective view of the dial in an embodiment of the present invention;

[0037] Figure 17 This is a perspective view of the pen advance / retractor assembly in an embodiment of the present invention;

[0038] Figure 18 This is an exploded view of the pen advance and retreat structure in an embodiment of the present invention.

[0039] Explanation of the labels in the diagram:

[0040] 1. Housing; 2. Adjustment knob; 3. Sharpening assembly; 4. Pencil advance / retract assembly; 5. Drive assembly; 6. Dial wheel; 7. Actuating lever; 8. Coupling; 9. Bracket; 10. Tool holder cover; 11. Support platform;

[0041] 1a. First space; 1b. Second space; 1c. Third space; 1d. Fourth space; 1e. Limiting protrusion;

[0042] 3a. Tool holder; 3b. Hob; 3c. Pen block;

[0043] 4a. Turbine; 4b. First forward / backward pen roller; 4c. Second forward / backward pen roller; 4d. Annular boss;

[0044] 5a. Motor; 5b. Reduction gear set;

[0045] 6a. Helical surface; 6b. Engaging part;

[0046] 7a. Support section;

[0047] 9a. Support part; 9b. First mounting slot; 9c. Second mounting slot. Implementation

[0048] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0049] like Figures 8 to 13 As shown, this embodiment discloses an adjustable pen clamping gap structure, including a pen sharpening assembly 3, a pen advance and retraction assembly 4, and a bracket 9. The pen advance and retraction assembly 4 includes a turbine 4a, a first pen advance and retraction roller 4b and a second pen advance and retraction roller 4c mounted on the bracket 9. The first pen advance and retraction roller 4b and the second pen advance and retraction roller 4c are arranged in parallel and both are meshed with the turbine 4a. The blade holder 3a on the pen advance and retraction assembly 4 is connected to the shaft of the turbine 4a.

[0050] The first advance / retract pen roller 4b and / or the second advance / retract pen roller 4c move relative to the bracket 9 at a first height position and a second height position. The maximum pen clamping gap between the first advance / retract pen roller 4b and the second advance / retract pen roller 4c at the first height position is not equal to the maximum pen clamping gap at the second height position. The blade holder 3a drives the turbine 4a to move axially. The turbine 4a abuts against the first advance / retract pen roller 4b and the second advance / retract pen roller 4c, so that the first advance / retract pen roller 4b and the second advance / retract pen roller 4c are held at the first height position, the second height position, or any position between the first height position and the second height position.

[0051] Specifically, in this embodiment, the first height position is higher than the second height position, that is, the first height position is above the second height position, and the first height position is closer to the pen inlet hole on the housing 1.

[0052] Specifically, the maximum pen-clamping gap between the first pen-advancing roller 4b and the second pen-advancing roller 4c at the first height position is not equal to the maximum pen-clamping gap at the second height position. That is, the maximum pen-clamping gap at the first height position corresponds to one pen-clamping gap setting, and the maximum pen-clamping gap at the second height position corresponds to another setting. In this embodiment, the maximum pen-clamping gap gradually decreases from the first height position to the second height position; in another embodiment, the maximum pen-clamping gap gradually increases from the first height position to the second height position.

[0053] Specifically, in this embodiment, the working principle of the adjustable pen clamping gap structure is as follows: The pen-sharpening assembly 3 moves upward, driving the turbine 4a to move. The turbine 4a moves the first advance / retract roller 4b and the second advance / retract roller 4c from the second height position to the first height position. Then, the pen-sharpening assembly 3 moves downward. The spline connecting the pen-sharpening assembly 3 and the turbine 4a shaft has an inclined guide surface. As the pen-sharpening assembly 3 rotates, the turbine 4a rotates synchronously while moving downward. The turbine 4a moves downward relative to the first advance / retract roller 4b and the second advance / retract roller 4c, and the turbine 4a remains engaged with the impellers on the first advance / retract roller 4b and the second advance / retract roller 4c. At this time, the first advance / retract roller 4b and the second advance / retract roller 4c are suspended in the air. When the pen tip is inserted, the push of the pen tip causes the first advance / retract roller 4b and the second advance / retract roller 4c to move from the first height position to the second height position.

[0054] Specifically, in another embodiment, an elastic element is provided between the first advance / retract pen roller 4b and the second advance / retract pen roller 4c and the support 9. The elastic element has an elastic tendency to keep the first advance / retract pen roller 4b and the second advance / retract pen roller 4c in contact with the turbine 4a, so that the first advance / retract pen roller 4b and the second advance / retract pen roller 4c can move up and down with the turbine 4a.

[0055] Specifically, in this embodiment, the bracket 9 is installed as a detachable component inside the upper cover; in another embodiment, the upper cover has a bracket 9 structure injection molded inside.

[0056] Furthermore, combined Figure 13 As shown, the bracket 9 is provided with two first mounting grooves 9b and two second mounting grooves 9c. The two ends of the first advance and retract pen roller 4b are respectively slidably engaged with the two first mounting grooves 9b, and the two ends of the second advance and retract pen roller 4c are respectively slidably engaged with the two second mounting grooves 9c.

[0057] Specifically, in this embodiment, the bracket 9 has two spaced and parallel support portions 9a, each support portion 9a having a certain height relative to the bottom of the bracket 9. The turbine 4a is rotatably mounted on the bottom of the bracket 9. Each of the two support portions 9a is provided with a first mounting groove 9b and a second mounting groove 9c spaced apart. The two ends of the first advance / retract pen roller 4b are respectively slidably engaged with the two first mounting grooves 9b, and the two ends of the second advance / retract pen roller 4c are respectively slidably engaged with the two second mounting grooves 9c.

[0058] Specifically, when the first forward and backward pen roller 4b moves between the first height position and the second height position, the first forward and backward pen roller 4b moves up and down as a whole.

[0059] Furthermore, the outer wall of the first mounting groove 9b and the outer wall of the second mounting groove 9c are arranged in a figure-eight or inverted figure-eight shape.

[0060] Specifically, the maximum pen-clamping gap at the first height position depends on the distance between the outer wall surface of the first mounting groove 9b and the outer wall surface of the second mounting groove 9c, that is, the maximum distance between the first mounting groove 9b and the second mounting groove 9c at the first height position. When an eight-shaped arrangement is adopted, as the first advance / retract pen roller 4b and the second advance / retract pen roller 4c move from the second height position to the first height position, the maximum pen-clamping gap between them gradually decreases; similarly, when an inverted eight-shaped arrangement is adopted, the maximum pen-clamping gap between them gradually increases.

[0061] Furthermore, combined Figure 14 As shown, the adjustable pen clamping gap structure also includes a housing 1, the first mounting groove 9b and the second mounting groove 9c both have upward openings, and the upper cover of the housing 1 extends downward to form a limiting protrusion 1e.

[0062] Specifically, in this embodiment, the first mounting groove 9b and the second mounting groove 9c adopt a notch structure to restrict the first and second pen rollers 4b and 4c, and to prevent the impellers on them from disengaging from the turbine 4a. Therefore, two spaced and parallel limiting protrusions 1e are added to the housing 1, each limiting protrusion 1e corresponding to a support part 9a. A single support part 9a, together with the first mounting groove 9b and the second mounting groove 9c on that side, forms a limiting groove structure.

[0063] Furthermore, in another embodiment, each support 9a is provided with two sliding groove structures, each sliding groove having two opposite ends. The two ends of the first advance / retract pen roller 4b are slidably engaged with one of the sliding grooves, and the two ends of the second advance / retract pen roller 4c are slidably engaged with the other sliding groove.

[0064] Furthermore, in another embodiment, the upper cover is elastically connected to the first advance / retract pen roller 4b and / or the second advance / retract pen roller 4c.

[0065] Specifically, in another embodiment, the two ends of the first advance / retract pen roller 4b extend out of the first mounting groove 9b, the two ends of the second advance / retract pen roller 4c extend out of the second mounting groove 9c, and the ends of the first advance / retract pen roller 4b and the ends of the second advance / retract pen roller 4c are elastically connected.

[0066] Furthermore, combined Figure 16 and Figure 17 As shown, in this embodiment, the turbine 4a is provided with an annular boss 4d, and the rubber rollers on the first advance / retract pen roller 4b and / or the second advance / retract pen roller 4c abut against the annular boss 4d.

[0067] Furthermore, the first advance / retractable pen roller 4b has at least a rubber roller, an impeller meshing with the turbine 4a, and a rotating shaft. The rubber roller and the impeller are both mounted on the rotating shaft, and the two ends of the rotating shaft are slidably engaged with the two first mounting grooves 9b. Similarly, the structure of the second advance / retractable pen roller 4c is centrally symmetrical to the structure of the first advance / retractable pen roller 4b.

[0068] Furthermore, in combination Figure 17 As shown, the turbine 4a has a central hole for the pencil to enter the pencil sharpening assembly 3. An annular boss 4d is formed on the upper end of the turbine 4a, and the turbine blades of the turbine 4a are located on the outer periphery of the annular boss 4d. The rubber rollers on the first and second advance / retract pencil rollers 4b and 4c both abut against the annular boss 4d.

[0069] Combination Figure 1-8 As shown, another embodiment discloses a pencil sharpener, including the adjustable pen clamping gap structure of this embodiment.

[0070] Specifically, in combination Figure 2 and Figure 3 As shown, in another embodiment, the housing 1 includes an upper cover, a middle cover, and a base, with a support platform 11 installed inside the base. The upper cover, middle cover, base, and support platform 11 divide the housing 1 into four spaces. These four spaces, from top to bottom, are designated as the first space 1a, the second space 1b, the third space 1c, and the fourth space 1d. The pen advance / retractor assembly 4 is installed in the first space 1a; the pen sharpening assembly 3 is installed in the second space 1b, so the second space 1b can also be called the chip chamber. The reduction gear set 5b is installed in the third space 1c; the motor 5a, power supply unit, circuit board, and other structures are installed in the fourth space 1d. The motor 5a is driven and mounted on the support platform 11, and the free end of the motor 5a shaft extends into the third space 1c, with a gear on the free end of the motor 5a shaft meshing with the reduction gear set 5b.

[0071] Furthermore, combined Figure 4 and Figure 5As shown, in another embodiment, a drive assembly 5 is installed inside the housing 1 of the pencil sharpener. The drive assembly 5 includes a motor 5a and a reduction gear set 5b. The output gear in the reduction gear set 5b is torque-transmittingly connected to the blade holder 3a in the pencil sharpener assembly 3 via a coupling 8.

[0072] Specifically, in combination Figure 5 As shown, the pencil feed direction is the axis of the pencil sharpener, so the turbine 4a, the blade holder 3a, the coupling 8, the output gear, and the gear ring that meshes with the hob 3b on the blade holder 3a are arranged coaxially.

[0073] Furthermore, combined Figure 4 As shown, the output gear is capable of moving along its axial direction relative to another gear in the reduction gear set 5b that meshes with the output gear, and remains engaged.

[0074] Furthermore, the housing 1 is provided with a dial wheel 6, the dial wheel 6 having a helical surface 6a on the side facing the tool holder 3a, and the helical surface 6a abutting against the through-touch rod 7 of the output gear.

[0075] Specifically, in another embodiment, the dial 6 is rotatably mounted on the support platform 11, and the dial is eccentrically positioned with respect to the output gear.

[0076] Specifically, in this embodiment, the pencil sharpening assembly 3 includes a blade holder 3a, a hob 3b mounted on the blade holder 3a, and a pencil stop block 3c slidably mounted on the blade holder 3a. The blade holder 3a, the coupling 8, and the output gear are hollow. One end of the actuating rod 7 is fixedly connected to the pencil stop block 3c, and the other end passes through the blade holder 3a, the coupling 8, the output gear, and the support platform 11 in sequence, abutting against the helical surface 6a.

[0077] More specifically, the lower half of the actuating rod 7 is provided with a support section 7a, the outer diameter of which is larger than the outer diameter of the upper half of the actuating rod 7. This is because the upper end of the support section 7a abuts against the output gear, and the lower end abuts against the helical surface 6a. The increase in its outer diameter enhances its structural strength.

[0078] Specifically, in this embodiment, the upper end of the bracket 9 is disposed in the first space 1a, the middle part of the bracket 9 passes through the tool holder cover 10 located in the second space 1b, and the bottom end of the bracket 9 is located in the fourth space 1d and is fixedly connected to the support platform 11. A gear ring is disposed on the tool holder cover 10, and the dial wheel 6 is rotatably disposed between the bracket 9 and the support platform 11.

[0079] Furthermore, the housing 1 is provided with an adjustment knob 2 that engages with the dial 6, and part of the adjustment knob 2 is exposed on the surface of the housing 1 to form an adjustable part.

[0080] Specifically, a meshing part 6b is provided on the outer periphery of the dial 6, and a gear structure that meshes with the meshing part 6b is provided on the outer periphery of the adjustment knob 2.

[0081] In another embodiment, the working principle of the pencil sharpener adjusting the clamping gap is as follows: By rotating the adjustable part on the adjustment knob 2, the adjustment knob 2 drives the dial 6 to rotate. During the rotation of the dial 6, the contact point between the trigger rod 7 and the spiral surface 6a changes, and the trigger rod 7 moves up or down. The contact rod drives the output gear, coupling 8, blade holder 3a, and turbine 4a to move up and down. During the movement, the turbine 4a drives the first advance and retract brush roller 4b and the second advance and retract brush roller 4c to move up and down, so that the advance and retract brush assembly 4 switches the clamping gap at different positions.

[0082] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0083] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0084] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0085] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that they are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0086] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0087] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A pencil clamping gap adjustable structure, comprising a pencil sharpening assembly (3), a pencil advancing and retreating assembly (4) and a support (9), the pencil advancing and retreating assembly (4) comprising a turbine (4a), a first pencil advancing and retreating roller (4b) and a second pencil advancing and retreating roller (4c) mounted on the support (9), the first pencil advancing and retreating roller (4b) and the second pencil advancing and retreating roller (4c) being arranged in parallel and both being in meshing connection with the turbine (4a), a knife holder (3a) on the pencil advancing and retreating assembly (4) being in axial connection with the turbine (4a); characterized in that the first pencil advancing and retreating roller (4b) and / or the second pencil advancing and retreating roller (4c) being movable relative to the support (9) between a first height position and a second height position, and the maximum pencil clamping gap of the first pencil advancing and retreating roller (4b) and the second pencil advancing and retreating roller (4c) at the first height position being different from the maximum pencil clamping gap at the second height position, the knife holder (3a) driving the turbine (4a) to move in the axial direction, the turbine (4a) being in abutment with the first pencil advancing and retreating roller (4b) and the second pencil advancing and retreating roller (4c) so as to keep the first pencil advancing and retreating roller (4b) and the second pencil advancing and retreating roller (4c) at the first height position, the second height position or any position between the first height position and the second height position.

2. The adjustable gap structure of claim 1, wherein: the support (9) being provided with two first mounting grooves (9b) and two second mounting grooves (9c), two ends of the first pencil advancing and retreating roller (4b) being in sliding fit with the two first mounting grooves (9b) respectively, and two ends of the second pencil advancing and retreating roller (4c) being in sliding fit with the two second mounting grooves (9c) respectively.

3. The adjustable gap structure of claim 2, wherein: the outer side wall of the first mounting groove (9b) and the outer side wall of the second mounting groove (9c) being arranged in a shape of eight or inverted eight.

4. The adjustable gap structure of claim 2, wherein: further comprising a housing (1), the first mounting groove (9b) and the second mounting groove (9c) each having an upward opening, and a limiting protrusion (1e) being formed by downward extension of an upper cover of the housing (1).

5. The adjustable gap structure of claim 4, wherein: the upper cover being in elastic connection with the first pencil advancing and retreating roller (4b) and / or the second pencil advancing and retreating roller (4c).

6. The adjustable gap structure of claim 1, wherein: the turbine (4a) being provided with an annular boss (4d), and a rubber roller on the first pencil advancing and retreating roller (4b) and / or the second pencil advancing and retreating roller (4c) being in abutment with the annular boss (4d).

7. A pencil sharpener characterized by: the pencil clamping gap adjustable structure according to any one of claims 1-6.

8. The sharpener of claim 7, wherein: the housing (1) of the pencil sharpener being provided with a driving assembly (5) mounted therein, the driving assembly (5) comprising a motor (5a) and a speed reduction gear set (5b), and an output gear in the speed reduction gear set (5b) being connected in torque-transmissible manner with the knife holder (3a) in the pencil sharpening assembly (3) through a shaft coupling (8).

9. The sharpener of claim 8, wherein: the housing (1) being provided with a dial (6), one side of the dial (6) facing the knife holder (3a) being provided with a helical surface (6a), and the helical surface (6a) being in abutment with the output gear through a touch rod (7).

10. The sharpener of claim 9, wherein: the housing (1) being provided with an adjusting knob (2) in meshing connection with the dial (6), and part of the adjusting knob (2) being exposed on the surface of the housing (1) to form an adjustable part.

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