A pencil sharpener

Abstract

This application discloses a pencil sharpener, including a housing and a pencil sharpening assembly installed within the housing. The pencil sharpening assembly includes a blade holder and a pencil stop block, the pencil stop block being slidably installed within the blade holder. An adjustment assembly is installed within the housing, the adjustment assembly including a transmission rod, an adjustment dial, and a knob. The knob is convexly connected to the adjustment dial, and the knob, when subjected to force, drives the adjustment dial to rotate. One end of the transmission rod is connected to the pencil stop block, and the other end of the transmission rod is connected to the adjustment dial. The adjustment dial, by rotating, adjusts the axial height of the transmission rod, thereby driving the pencil stop block to slide and adjust its axial position against the pencil tip. This not only improves the accuracy of adjustment but also optimizes space utilization.

Description

Technical Field

[0001] This application relates to the field of stationery technology, and more specifically to a pencil sharpener. Background Technology

[0002] A pencil sharpener is a stationery item used to sharpen writing instruments such as pencils and colored pencils. It works by using a built-in blade to shave away the outer wood layer of the pencil through relative movement, exposing the lead inside, thus facilitating writing and drawing. Pencil sharpeners are designed to improve the efficiency and safety of sharpening pencils, while reducing the inconvenience and dangers that can occur with manual sharpening. Traditional pencil sharpeners have a fixed blade position and angle, making it impossible to adjust the sharpening depth and angle according to the user's needs. This means that regardless of the initial thickness of the pencil, the resulting tip is essentially the same thickness. In some special scenarios, such as drawing or engineering drafting, users require different tip thicknesses. Traditional pencil sharpeners cannot provide this flexibility; users can only roughly control the tip thickness by repeatedly trying and adjusting the depth of pencil insertion, a method that is neither precise nor convenient. To address the aforementioned issues, Chinese utility model patent CN210211843U discloses a mechanism for adjusting the pencil tip thickness in a pencil sharpener. This mechanism includes a planing frame with a planing blade mounted on it; a sliding pin, a gear, and a rack. The gear and rack mesh, and both are mounted on the pencil sharpener. The rack has an operating section protruding from the pencil sharpener for operation. A lifting mechanism is provided between the sliding pin and the gear. The sliding pin is connected to the planing frame. This technical solution uses a lifting mechanism to raise and lower the sliding pin, which in turn raises and lowers the planing frame, thus controlling the pencil tip thickness. However, this sliding adjustment method has relatively low precision, making it difficult for users to predict the adjustment level and requiring multiple adjustments to achieve the desired tip thickness. Furthermore, the rack needs to slide linearly inside the pencil sharpener, requiring sufficient space to accommodate its movement, which increases the size of the pencil sharpener and affects its portability and aesthetics. Therefore, there is a need for a pencil sharpening tool that can precisely adjust the nib thickness without increasing its size. Summary of the Invention

[0003] The technical problem to be solved by this application is to provide a pencil sharpener that achieves precise adjustment of the position of the pencil block through a combination of knob, adjustment dial and transmission rod, thereby controlling the thickness of the sharpened pencil tip. This not only improves the accuracy of adjustment and the ease of operation, but also optimizes space utilization and improves the durability and reliability of the pencil sharpener.

[0004] This application provides a pencil sharpener, including a housing and a pencil sharpening assembly installed within the housing. The pencil sharpening assembly includes a blade holder and a pencil stop block, the pencil stop block being slidably installed within the blade holder. An adjustment assembly is installed within the housing, the adjustment assembly including a transmission rod, an adjustment dial, and a knob. The knob is throttlely connected to the adjustment dial, and the knob, when subjected to force, drives the adjustment dial to rotate. One end of the transmission rod is connected to the pencil stop block, and the other end of the transmission rod is connected to the adjustment dial. The adjustment dial, by rotating, adjusts the axial height of the transmission rod, thereby driving the pencil stop block to slide and adjust its axial position against the pencil tip.

[0005] In this technical solution, the pencil stop block is slidably installed inside the blade holder to control the insertion depth of the pencil and the thickness of the pencil tip. The knob is located outside the housing for user operation. Rotating the knob drives the adjustment dial to rotate, which changes the axial height of the transmission rod. The transmission rod drives the pencil stop block to slide axially. The change in the axial position of the pencil stop block directly affects the insertion depth of the pencil, thereby controlling the thickness of the pencil tip. The knob can be designed with multiple settings, allowing users to select different pencil tip thicknesses as needed, making operation more flexible. Users can quickly find the desired pencil tip thickness setting and adjust more precisely. The combination of the knob and the adjustment dial does not require additional sliding space, making the entire adjustment component structure more compact and improving the portability and aesthetics of the pencil sharpener.

[0006] As an improvement, the knob is equipped with a first gear, and the adjustment dial is equipped with a second gear. The first gear and the second gear cooperate so that the knob, when subjected to force, can drive the adjustment dial to rotate. In this technical solution, the cooperation of the first gear and the second gear ensures that the rotation of the knob can be accurately converted into the rotation of the adjustment dial, thereby realizing the adjustment of the position of the pen stop block, providing precise transmission and high-precision adjustment, optimizing space utilization, and improving the durability and reliability of the pencil sharpener.

[0007] As an improvement, the adjustment component further includes a transition gear, with both the first gear and the second gear meshing with it. In this technical solution, the transition gear serves as an intermediate transmission component, connecting the first gear and the second gear. This allows the rotational movement of the knob to be transmitted to the adjustment dial via the transition gear. The design of the transition gear effectively avoids other components or structures within the housing, achieving the transmission function without interfering with other components. This makes the transmission path between the first gear and the second gear more flexible, reduces space waste, and results in a smaller overall size and greater portability of the pencil sharpener.

[0008] As an improvement, the adjusting turntable has multiple stepped structures, which connect to the other end of the transmission rod. These stepped structures are sequentially distributed circumferentially with gradually decreasing heights, and adjacent stepped structures are connected by transition ramps. This technical solution designs multiple stepped structures with progressively varying heights, allowing the transmission rod to switch between different stepped structures, thereby achieving height adjustment. By changing the axial height of the transmission rod, the position of the stop block is adjusted. The transition ramps between adjacent stepped structures make the switching of the transmission rod between different steps smoother, avoiding abrupt jumps and extending the service life of the transmission rod and the adjusting turntable.

[0009] As an improvement, the first gear and the knob are separate structures. The first gear has a snap-fit, and the knob has a locking position that matches the snap-fit. The snap-fit ​​passes through the housing and connects to the locking position. In this technical solution, through the cooperation of the snap-fit ​​and the locking position, the knob and the first gear can be firmly connected together, and the knob and the first gear can rotate synchronously. The design of the snap-fit ​​passing through the housing and connecting to the locking position not only realizes the connection between the knob and the first gear, but also ensures that the knob and the first gear can be stably installed on the housing, improving installation efficiency.

[0010] As an improvement, the first gear is a crown gear. In this technical solution, the crown gear is a special type of gear with its teeth arranged in a fan shape, similar to the shape of a crown. The teeth of the crown gear are perpendicular to the axis, which is used to realize the transmission between vertical axes. This allows it to achieve reliable transmission even when space is limited, making it suitable for use in small spaces and optimizing the overall design of the pencil sharpener.

[0011] As an improvement, the adjusting turntable and the second gear are integrated into a single structure, and are arranged vertically. In this technical solution, the adjusting turntable and the second gear are designed as a whole, reducing the number of mechanical parts, making the entire transmission system more compact, reducing space occupation, and the vertical arrangement makes the transmission path more reasonable, further optimizing the space utilization within the housing.

[0012] As an improvement, the tool holder is provided with a sliding groove for slidingly mounting the pen stop block, and the bottom of the tool holder has a through hole communicating with the sliding groove. One end of the transmission rod is inserted into the through hole to abut against the pen stop block. In this technical solution, the sliding groove provides a fixed sliding path for the pen stop block, ensuring that the pen stop block can move smoothly along the axial direction and abut against the pen tip. The through hole at the bottom of the tool holder, communicating with the sliding groove, provides a channel for the transmission rod to contact the pen stop block. The design of the sliding groove and the through hole makes the entire adjustment assembly more compact and achieves precise control of the pen tip thickness.

[0013] As an improvement, a drive gear is connected to the bottom of the blade holder, and the drive gear is connected to a drive mechanism to drive the blade holder to rotate. The transmission rod is slidably installed inside the drive gear. In this technical solution, the drive mechanism (such as a motor) drives the blade holder to rotate through the drive gear, thereby realizing the automatic pencil sharpening function and improving the user experience. The transmission rod slides inside the drive gear, and by adjusting the rotation of the turntable, the transmission rod pushes the pencil block to move in the groove inside the blade holder, making the movement more reliable and the transmission more precise.

[0014] As an improvement, a trigger block and a start switch are also installed inside the housing. The trigger block and the start switch are elastically connected, and the start switch is electrically connected to the drive mechanism. The blade holder is installed inside the housing and can float up and down. The trigger block is fitted onto the drive gear. When the blade holder is subjected to force, causing the drive gear to move downward, the trigger block is forced downward to abut against the start switch, triggering the drive mechanism to open. In this technical solution, the trigger block and the start switch are connected by an elastic element (such as a spring), ensuring that the trigger block can flexibly contact or separate from the start switch when subjected to external force. The start switch is electrically connected to the drive mechanism, and the trigger block is fitted onto the drive gear. The blade holder can float up and down inside the housing. This design allows the blade holder to move downward when a pencil is inserted. When the blade holder is forced downward, the drive gear also moves downward, causing the trigger block to abut against the start switch. When the start switch is triggered by the trigger block, the drive mechanism starts working, driving the blade holder to rotate and sharpen the pencil. The user only needs to insert the pencil into the blade holder, and the pencil sharpener will start automatically without any additional operation, improving ease of use. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of a pencil sharpener according to this application.

[0016] Figure 2 This is a three-dimensional structural diagram of the pencil sharpening component and the adjustment component in this application.

[0017] Figure 3 This is a three-dimensional structural diagram of the adjusting turntable in this application.

[0018] Figure 4 This is a three-dimensional structural diagram of the knob in this application.

[0019] Figure 5 This is a three-dimensional structural diagram of the first gear in this application.

[0020] Figure 6 This is a cross-sectional structural diagram of a pencil sharpener according to this application.

[0021] The diagram shows: 1. Housing; 2. Pencil sharpening assembly; 21. Blade holder; 211. Slide groove; 212. Through hole; 22. Blade; 23. Pencil stop block; 3. Transmission rod; 4. Adjustment dial; 41. Second gear; 42. Step structure; 43. Transition slope; 5. Knob; 51. First gear; 511. Snap-on; 52. Snap-on position; 6. Transition gear; 7. Drive gear; 8. Actuating block; 9. Start switch. Detailed Implementation

[0022] To better understand this application, various aspects of this application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely illustrative of exemplary embodiments of this application and are not intended to limit the scope of this application in any way. Throughout the specification, the same reference numerals refer to the same elements.

[0023] In the accompanying drawings, the thickness, size, and shape of the objects have been slightly exaggerated for illustrative purposes. The drawings are for illustrative purposes only and are not drawn to scale.

[0024] It should also be understood that the terms "comprising," "including," "having," "containing," and "including," when used in this specification, indicate the presence of the stated features, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or combinations thereof. The terms "first," "second," etc., are primarily used to distinguish different devices, elements, or components (the specific types and constructions may be the same or different), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise stated, "a plurality of" means two or more.

[0025] Furthermore, it should be noted that the terms "installation," "setting," "equipped with," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, elements, or components; they can refer to a direct installation on another component or the possible presence of another intermediate component. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the specification of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0026] like Figures 1 to 6As shown, this application discloses a pencil sharpener, including a housing 1 and a pencil sharpening assembly 2 installed within the housing 1. The pencil sharpening assembly 2 includes a blade holder 21, a blade 22, and a pencil stop block 23. The blade 22 is mounted on the blade holder 21 for cutting pencils. The pencil stop block 23 is slidably mounted within the blade holder 21 for controlling the insertion depth of the pencil and the thickness of the pencil tip. An adjustment assembly is installed within the housing 1, including a transmission rod 3, an adjustment turntable 4, and a knob 5. The knob 5 is convexly connected to the adjustment turntable 4, and the knob 5 drives the adjustment turntable 4 to rotate. One end of the transmission rod 3 is connected to the pencil stop block 23, and the other end of the transmission rod 3 is connected to the adjustment turntable 4. The adjustment turntable 4 adjusts the axial height of the transmission rod 3 by rotating, thereby driving the pencil stop block 23 to slide and adjust its axial position against the pencil tip. The blade 22 is mounted on the blade holder 21, and the pencil stop block 23 is slidably mounted inside the blade holder 21. The knob 5 is located outside the housing 1 and is used for user operation. Rotating the knob 5 drives the adjustment dial 4 to rotate. The rotation of the adjustment dial 4 changes the axial height of the transmission rod 3, which in turn drives the pencil stop block 23 to slide axially. The change in the axial position of the pencil stop block 23 directly affects the depth of pencil insertion, thereby controlling the thickness of the sharpened tip. The knob 5 can be designed with multiple settings, allowing users to select different tip thicknesses as needed, making operation more flexible. Users can quickly find the desired tip thickness setting and adjust more precisely. The combination of the knob 5 and the adjustment dial 4 does not require additional sliding space, making the entire adjustment assembly structure more compact and improving the portability and aesthetics of the pencil sharpener.

[0027] More specifically, such as Figure 2 As shown, the knob 5 is equipped with a first gear 51, and the adjustment dial 4 is equipped with a second gear 41. The first gear 51 and the second gear 41 cooperate so that the knob 5 can drive the adjustment dial 4 to rotate when subjected to force. The cooperation between the first gear 51 and the second gear 41 ensures that the rotation of the knob 5 can be accurately converted into the rotation of the adjustment dial 4, thereby realizing the adjustment of the position of the pen block 23, providing precise transmission and high-precision adjustment, optimizing space utilization, and improving the durability and reliability of the pencil sharpener.

[0028] More specifically, such as Figure 2 As shown, the adjustment assembly also includes a transition gear 6. The first gear 51 and the second gear 41 both mesh with the transition gear 6. The transition gear 6 serves as an intermediate transmission component, connecting the first gear 51 and the second gear 41. This allows the rotational movement of the knob 5 to be transmitted to the adjustment turntable 4 through the transition gear 6. The design of the transition gear 6 can effectively avoid other components or structures within the housing 1, achieving the transmission function without interfering with other components. This makes the transmission path between the first gear 51 and the second gear 41 more flexible, reduces space waste, and makes the overall size of the pencil sharpener smaller and more portable.

[0029] More specifically, such as Figure 2 and Figure 3 As shown, the adjusting turntable 4 has multiple stepped structures 42. The stepped structures 42 are used to connect the other end of the transmission rod 3. The multiple stepped structures 42 are distributed sequentially along the circumference and their height gradually decreases. Adjacent stepped structures 42 are connected by transition slopes 43. The design of multiple stepped structures 42 with gradually changing heights allows the transmission rod 3 to switch between different stepped structures 42, thereby achieving different height adjustments. By changing the axial height of the transmission rod 3, the position of the pen stop block 23 can be adjusted. The connection between adjacent stepped structures 42 by transition slopes 43 makes the switching of the transmission rod 3 between different steps smoother, avoiding abrupt jumps and extending the service life of the transmission rod 3 and the adjusting turntable 4.

[0030] More specifically, such as Figure 2 , Figure 4 and Figure 5 As shown, the first gear 51 and the knob 5 are separate structures. The first gear 51 is provided with a buckle 511, and the knob 5 is provided with a buckle position 52 that matches the buckle 511. The buckle 511 passes through the housing 1 and connects with the buckle position 52. Through the cooperation of the buckle 511 and the buckle position 52, the knob 5 and the first gear 51 can be firmly connected together, and the knob 5 and the first gear 51 can rotate synchronously. The design of the buckle 511 passing through the housing 1 and connecting with the buckle position 52 not only realizes the connection between the knob 5 and the first gear 51, but also ensures that the knob 5 and the first gear 51 can be stably installed on the housing 1, thus improving the installation efficiency.

[0031] More specifically, such as Figure 5 As shown, the first gear 51 is a crown gear. A crown gear is a special type of gear with its teeth arranged in a fan shape, similar to the shape of a crown. The teeth of the crown gear are perpendicular to the axis and are used to realize the transmission between vertical axes. This allows it to achieve reliable transmission even when space is limited, making it suitable for use in small spaces and optimizing the overall design of the pencil sharpener.

[0032] More specifically, such as Figure 3 As shown, the adjusting turntable 4 and the second gear 41 are integrated structures. The adjusting turntable 4 and the second gear 41 are distributed vertically. The adjusting turntable 4 and the second gear 41 are designed as a whole, which reduces the number of mechanical parts, makes the entire transmission system more compact, reduces space occupation, and the vertical distribution design makes the transmission path more reasonable, further optimizing the space utilization inside the housing 1.

[0033] More specifically, such as Figure 2As shown, the tool holder 21 has a sliding groove 211 for slidingly mounting the pen stop block 23. The bottom of the tool holder 21 has a through hole 212 communicating with the sliding groove 211. One end of the transmission rod 3 is inserted into the through hole 212 to abut against the pen stop block 23. The sliding groove 211 provides a fixed sliding path for the pen stop block 23, ensuring that the pen stop block 23 can move smoothly along the axial direction and abut against the pen tip. The bottom of the tool holder 21 has a through hole 212 communicating with the sliding groove 211. The through hole 212 provides a channel for the transmission rod 3 to contact the pen stop block 23. The design of the sliding groove 211 and the through hole 212 makes the entire adjustment assembly more compact and achieves precise control of the pen tip thickness.

[0034] More specifically, such as Figure 6 As shown, a drive gear 7 is connected to the bottom of the blade holder 21. The drive gear 7 is connected to the drive mechanism to drive the blade holder 21 to rotate. The transmission rod 3 is slidably installed in the drive gear 7. The drive mechanism drives the blade holder 21 to rotate through the drive gear 7, thereby realizing the automatic pencil sharpening function and improving the user experience. The transmission rod 3 slides inside the drive gear 7. By adjusting the rotation of the turntable 4, the transmission rod 3 pushes the pencil block 23 to move in the slide groove 211 inside the blade holder 21, making the movement more reliable and the transmission more precise.

[0035] More specifically, such as Figure 6 As shown, a trigger block 8 and a start switch 9 are also installed inside the housing 1. The trigger block 8 and the start switch 9 are elastically connected, and the start switch 9 is electrically connected to the drive mechanism. The tool holder 21 is installed inside the housing 1 and can float up and down. The trigger block 8 is fitted onto the drive gear 7. When the tool holder 21 is subjected to force, driving the drive gear 7 to move downward, the trigger block 8 is forced downward to abut against the start switch 9, thereby triggering the drive mechanism to open. The trigger block 8 and the start switch 9 are connected by an elastic element, ensuring that the trigger block 8 can flexibly contact or separate from the start switch 9 when subjected to external force, thus activating the drive mechanism. Switch 9 is electrically connected to the drive mechanism. The trigger block 8 is mounted on the drive gear 7. The blade holder 21 can float up and down inside the housing 1. This design allows the blade holder 21 to move downward when a pencil is inserted. When the blade holder 21 is forced to move downward, the drive gear 7 will also move downward, causing the trigger block 8 to press against the start switch 9. When the start switch 9 is triggered by the trigger block 8, the drive mechanism starts to work and drives the blade holder 21 to rotate and sharpen the pencil. The user only needs to insert the pencil into the blade holder 21, and the pencil sharpener will start automatically without any additional operation, which improves the convenience of use.

[0036] This application is not limited to the above-described preferred embodiments. Anyone can derive other products in various forms under the guidance of this application. However, regardless of any changes made to their shape or structure, any technical solution that is the same as or similar to that of this application falls within the protection scope of this application.

Claims

1. A pencil sharpener, comprising a housing (1) and a pencil sharpening assembly (2) installed within the housing (1), the pencil sharpening assembly (2) comprising a blade holder (21) and a pencil stop block (23), the pencil stop block (23) being slidably installed within the blade holder (21), characterized in that, An adjustment assembly is installed inside the housing (1). The adjustment assembly includes a transmission rod (3), an adjustment turntable (4), and a knob (5). The knob (5) is connected to the adjustment turntable (4) in a transmission manner. The knob (5) drives the adjustment turntable (4) to rotate under force. One end of the transmission rod (3) is connected to the pen stop block (23), and the other end of the transmission rod (3) is connected to the adjustment turntable (4). The adjustment turntable (4) adjusts the axial height of the transmission rod (3) by rotating, so as to drive the pen stop block (23) to slide and adjust the axial position of the pen tip.

2. A pencil sharpener according to claim 1, characterized in that, The knob (5) is provided with a first gear (51), and the adjustment turntable (4) is provided with a second gear (41). The first gear (51) and the second gear (41) cooperate so that the knob (5) can be driven to rotate the adjustment turntable (4) by force.

3. A pencil sharpener according to claim 2, characterized in that, The adjustment assembly also includes a transition gear (6), and the first gear (51) and the second gear (41) both mesh with the transition gear (6).

4. A pencil sharpener according to claim 1, characterized in that, The adjustment turntable (4) is provided with multiple step structures (42). The step structures (42) are used to connect the other end of the transmission rod (3). The multiple step structures (42) are distributed sequentially along the circumference and their height gradually decreases. Adjacent step structures (42) are connected by transition slopes (43).

5. A pencil sharpener according to claim 2, characterized in that, The first gear (51) and the knob (5) are separate structures. The first gear (51) is provided with a buckle (511), and the knob (5) is provided with a buckle (52) that is adapted to the buckle (511). The buckle (511) passes through the housing (1) and is connected to the buckle (52).

6. A pencil sharpener according to claim 2, characterized in that, The first gear (51) is a crown gear.

7. A pencil sharpener according to claim 1, characterized in that, The adjusting turntable (4) and the second gear (41) are an integral structure, and the adjusting turntable (4) and the second gear (41) are distributed vertically.

8. A pencil sharpener according to claim 1, characterized in that, The tool holder (21) is provided with a sliding groove (211) for slidingly installing the pen block (23). The bottom of the tool holder (21) is provided with a through hole (212) communicating with the sliding groove (211). One end of the transmission rod (3) is inserted into the through hole (212) to abut against the pen block (23).

9. A pencil sharpener according to claim 8, characterized in that, The bottom of the tool holder (21) is connected to a drive gear (7), which is connected to a drive mechanism to drive the tool holder (21) to rotate. The transmission rod (3) is slidably installed inside the drive gear (7).

10. A pencil sharpener according to claim 9, characterized in that, The housing (1) is also equipped with a trigger block (8) and a start switch (9). The trigger block (8) and the start switch (9) are elastically connected. The start switch (9) is electrically connected to the drive mechanism. The tool holder (21) is installed in the housing (1) and can float up and down. The trigger block (8) is fitted on the drive gear (7). When the tool holder (21) is forced to drive the drive gear (7) to move downward, the trigger block (8) is forced to press against the start switch (9) to trigger the drive mechanism to open.

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