Pencil sharpener

Abstract

According to the pencil sharpener, a user can rotate the rocking handle in one direction to achieve automatic pencil sharpening. The power of the rocking handle is shunted, one path enables a pen clamping rack to descend at a constant speed through a pen clamping rack driving system, and the penholder is inserted into a sharpening mold; and the other path drives the blade to perform reciprocating cutting along the guide slope through the tool rest driving system. And when the pen clamping frame descends to a preset position, the spiral spring triggers resetting, and the cutting mold rotates by 90 degrees to switch a cutting surface while the pen clamping frame is lifted. According to the pencil sharpener, the cutting amount is controlled through accurate matching of the lead of the lead screw and the number of turns of the rocking handle, automatic reset and face changing are achieved through the transmission mechanism, and manual intervention is not needed. Specific shapes such as flat-head eyebrow pencils can be accurately cut, operation is easy and convenient, the spill-proof cover is designed to avoid splashing of pencil scraps and accidental injury of the blade, and high efficiency and safety are achieved.

Description

Technical Field

[0001] The present invention relates to the field of daily necessities, in particular to a pencil sharpener. Background Art

[0002] In the cosmetics industry, eyebrow pencils and other pens often need to be sharpened into specific shapes, such as flat tips, to meet user requirements. Existing pencil sharpeners are mostly designed for ordinary writing pens, making it difficult to accurately sharpen eyebrow pencils into the required specific shapes. Therefore, a pencil sharpener that can address this problem is urgently needed. Summary of the Invention

[0003] In view of the above, an object of the present invention is to provide a pencil sharpener to address the problems of the prior art.

[0004] A pencil sharpener in this solution is characterized by comprising: Pen holder, used to fix pens; a knife holder, on which a blade is mounted; The cutting die is provided with a channel for inserting the pen tip and a guide slope, and the blade moves along the guide slope to cut the pen tip; A crank system for providing power; The tool holder drive system connects the crank system and the tool holder, converting the rotational motion of the crank system into the linear reciprocating motion of the tool holder; The pen holder drive system connects the crank system and the pen holder, converting the rotational motion of the crank system into the downward motion of the pen holder; The cutting die drive system connects the pen holder and the cutting die, and drives the cutting die to rotate when the pen holder is reset and raised to achieve multi-faceted cutting.

[0005] Furthermore, the cutting die is cylindrical, and four guiding slopes are provided on the bottom thereof, and the distances between the front and rear guiding slopes and the left and right guiding slopes and the axis of the cutting die are different.

[0006] Furthermore, the blade is movably mounted on the blade holder, and an elastic element is provided between the blade and the blade holder so that the blade always clings to the guide inclined surface.

[0007] Furthermore, it also includes a bottom plate and an anti-overflow cover installed thereon, and the anti-overflow cover surrounds the tool holder.

[0008] Furthermore, a tool holder slide groove is provided in the anti-overflow cover, and the tool holder slides in cooperation with the tool holder slide groove; A rotating rack is provided on the top of the tool holder slide, and a rotating hole for fixing the cutting die is provided at the center of the rotating rack.

[0009] Furthermore, the cutting die driving system includes: A half-toothed gear is provided on the top of the rotating frame, and its gear shaft is fixed by a shaft sleeve provided on the rotating frame; A transmission sleeve coaxial with the cutting die has a raised limiting portion on its inner side; The rotor is fixed to the cutting die and has a wave groove on its outer periphery that matches the raised limiting portion; a first connecting rod assembly connecting the half-tooth gear and the transmission sleeve; The rack provided on the side of the pen holder drives the half-tooth gear to rotate when the pen holder is lifted, and drives the transmission sleeve to rise and fall through the first connecting rod assembly, so that the raised limit part moves along the wave groove, driving the rotor and the cutting mold to rotate.

[0010] Furthermore, the pen holder drive system includes a bevel gear shaft and a screw rod. The screw rod is arranged upright and rotatably next to the tool holder. The pen holder is provided with an integral screw rod sleeve. The screw rod sleeve is spirally connected to the screw rod. A base for mounting the bevel gear shaft is provided on the bottom plate. The crank system is provided with a crank shaft, which is installed on the base. The two ends of the bevel gear shaft are respectively connected to the crank shaft and the screw rod.

[0011] Furthermore, the screw rod is provided with a movable bevel gear for transmission, which is movably sleeved on the screw rod; A connecting sleeve is sleeved below the movable bevel gear, and a tension spring is provided between the connecting sleeve and the tool holder slide groove; A limiting piece and a limiting spring are provided on the base, and the limiting piece is pushed to the bottom of the movable bevel gear under the action of the limiting spring; A worm spring is provided at the bottom of the screw rod; A top rod cooperating with a limit piece is provided at the bottom of the screw sleeve; When the pen holder is lowered into place, the push rod pushes the limiting plate to compress the limiting spring and retract it, so that the movable bevel gear is separated from the bevel gear shaft under the action of the tension spring, and the worm spring drives the screw rod to reverse and reset.

[0012] Further, a lever hinged to the base; a second connecting rod assembly connecting the crank shaft and the lever; A transverse guide rod is provided on the tool holder; A movable sleeve is sleeved on the transverse guide rod, and the end of the lever is hinged to the movable sleeve.

[0013] Beneficial effects: 1. It can accurately achieve multi-faceted cutting of pens, meeting the needs of sharpening pens with specific shapes such as flat-head eyebrow pencils.

[0014] 2. Easy to operate, just need to rotate the handle in one direction continuously, no need to manually adjust the feed, cutting or changing the surface, the pencil sharpening process is fully automated.

[0015] 3. It has automatic cycle performance. When the pen holder drops to the predetermined position, the worm spring and the transmission clutch mechanism (movable bevel gear, limit plate, etc.) are automatically triggered to reset. The pen holder is lifted and the cutting mold rotates to change the surface. No manual intervention is required to enter the next round of cutting. It is suitable for continuous forming of polyhedron pen tips (such as four-sided cutting). BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of the three-dimensional structure of this application; Figure 2 、 Figure 3 、 Figure 4 This is a schematic diagram of the structure of this application from different perspectives after removing the overflow cover; Figure 5 A schematic cross-sectional view of the present application; Figure 6 This is a schematic diagram of the cooperation between the cutting die and the pen of this application; Figure 7 This is a schematic diagram of the structure of the tool holder of this application; Figure 8 This is a schematic diagram of the assembly structure of the limit piece of this application; Figure 9 、 Figure 10 Schematic diagram of different states of the tool holder drive system of this application; Figure 11 is a schematic diagram of the movable bevel gear in the meshing state; Figure 12 A schematic diagram of the movable bevel gear in an engaged state and a schematic diagram of the bevel gear shaft in a disengaged state; Figure 13 It is a structural diagram of the pen holder drive system; Figure 14 Schematic diagram of the working state of the pen holder drive system; Figure 15 Schematic diagram of the matching changes between the rotor and the transmission sleeve; Figure 16 This is a schematic diagram of the working state change of the first connecting rod drive assembly; Figure 17 This is the structural explosion diagram of the pen holder; Reference numerals: pen holder 100, screw sleeve 102, ejector rod 102a, bottom support 102b, chuck 103, spring top ball 104, tool holder 200, blade 201, elastic element 202, tool holder slide 203, rotating frame 204, rotating hole 204a, shaft sleeve 204b, cutting die 300, guide slope 301, crank system 400, base 401, crank shaft 402, tool holder drive system 500, lever 501, second connecting rod assembly 502, transverse guide rod 503, movable Sleeve 504, pen holder drive system 600, bevel gear shaft 601, screw 602, movable bevel gear 603, connecting sleeve 603a, tension spring 604, limit plate 605, limit spring 606, worm spring 607, cutting mold drive system 700, half-tooth gear 701, gear shaft 701a, transmission sleeve 702, raised limit portion 702a, rotor 703, wave groove 703a, first connecting rod assembly 704, rack 705, torsion spring 706 pen 800, bottom plate 901, overflow cover 902. DETAILED DESCRIPTION

[0017] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0018] Reference Figures 1 to 17 A pencil sharpener is shown, comprising: A pen holder 100 for holding a pen 800; A blade holder 200 is provided with a blade 201; The cutting die 300 is provided with a channel for inserting the pen tip and a guide slope 301, and the blade 201 moves along the guide slope 301 to cut the pen tip; A crank system 400 for providing power; The tool holder drive system 500 connects the crank system 400 and the tool holder 200 and converts the rotational motion of the crank system 400 into the linear reciprocating motion of the tool holder 200; The pen holder drive system 600 connects the crank system 400 and the pen holder 100 and converts the rotational motion of the crank system 400 into the downward motion of the pen holder 100; The cutting die driving system 700 connects the pen holder 100 and the cutting die 300, and drives the cutting die 300 to rotate when the pen holder 100 is reset and raised to achieve multi-faceted cutting.

[0019] In this embodiment, the cutting die, serving as the forming component, features a hollow cylindrical structure into which a pen 800 is inserted. Taking the example of an eyebrow pencil 800 being cut into a flat tip, its base is designed with four guiding slopes 301 to accommodate the specific requirements of this type of pencil. More specifically, in this embodiment, the distance difference between the front and rear guiding slopes 301 and the left and right guiding slopes 301 from the axis is controlled to achieve differentiated cutting volume during the cutting process. Only a moderate amount of the pen 800 shaft and a portion of the pen 800 core are removed from the left and right sides, while more of the pen 800 shaft and a majority of the pen 800 core are removed from the front and back sides, thereby creating a flat pen tip shape that meets cosmetic needs. Due to the different positions of the guiding slopes 301, in this embodiment, the blade 201 is movably fixed to the blade holder 200. A spring element 202 provides a spring force to keep the blade 201 in close contact with the cutting die 300. This ensures that the blade 201 follows the intended cutting path, regardless of whether cutting the front and back sides or the left and right sides. The elastic element 202 may be a spring or other elastic device.

[0020] In this embodiment, the cutting die drive system 700 is used to rotate the cutting die 300 90 degrees at a time. The rotation is significant because after cutting the front and back surfaces of the nib, the pen holder 100 returns to its original position and rises. The cutting die drive system 700 converts this upward movement into a rotational motion of the cutting die 300, rotating it 90 degrees before cutting the other two surfaces.

[0021] In this embodiment, the present application further comprises a base plate 901, on which is mounted an anti-spill cover 902 that surrounds the tool holder 200, preventing shavings from the pen 800 from flying and preventing accidental damage from the blade 201. Within the area enclosed by the anti-spill cover 902 is a tool holder slide 203 that guides the linear reciprocating movement of the tool holder 200. The tool holder 200 slides in the tool holder slide 203, and a gantry-style rotating frame 204 is mounted on top of the tool holder slide 203. A rotating hole 204a is located in the center of the rotating frame 204, which can be used to secure the cutting die 300.

[0022] In this embodiment, the cutting mold driving system 700 includes a half-toothed gear 701 in a fixed position, and the half-toothed gear 701 has a gear shaft 701a, which is fixed by a shaft sleeve 204b arranged on the top side of the rotating frame 204. The cutting mold driving system 700 also includes a transmission sleeve 702 arranged above the center of the rotating frame 204 and coaxial with the cutting mold 300. The transmission sleeve 702 contains a rotor 703, and the rotor 703 is integrally arranged with the cutting mold 300. The outer side of the rotor 703 has a wave groove 703a arranged along the outer periphery, and the inner side of the transmission sleeve 702 has a raised limiting portion 702a that cooperates with the wave groove 703a. There is a first connecting rod assembly 704 between the transmission sleeve 702 and the half-toothed gear 701. The cutting mold driving system 700 also includes a rack 705 arranged on the side of the pen holder 100. The principle of this system is: when the pen holder 100 is lifted, the rack 705 can drive the half-tooth gear 701 to rotate. When the half-tooth gear 701 rotates, the first connecting rod assembly 704 converts the rotational motion into the lifting motion of the transmission sleeve 702. When the transmission sleeve 702 is lifted, the cooperation between the raised limit portion 702a and the wave groove 703a can drive the rotor 703 and the cutting mold 300 to rotate ninety degrees.

[0023] It should be noted that the toothed half of the half-toothed gear 701 is initially facing downward, and a torsion spring 706 is attached to the gear shaft 701a. When the pen holder 100 is lowered, the toothed half of the half-toothed gear 701 faces downward, so the rack 705 can only contact one tooth during its downward movement. The next tooth is smooth, and the half-toothed gear 701 is held in place by the torsion spring 706, preventing it from rotating.

[0024] When the rack 705 moves upward, the rack 705 drives the half-toothed gear 701 to rotate half a circle and then derail and is brought back to the initial state by the torsion spring 706.

[0025] In this embodiment, the pen holder drive system 600 includes a bevel gear shaft 601 and a screw 602. The screw 602 is vertically and rotatably arranged next to the tool holder 200. The pen holder 100 has an integral screw sleeve 102 that is screwedly connected to the screw 602. The bevel gear shaft 601 is horizontally mounted on a base 401 mounted on a bottom plate 901. The crank shaft 402 of the crank system 400 is also mounted on the base 401. The ends of the bevel gear shaft 601 respectively engage with a fixed bevel gear on the crank shaft 402 and a movable bevel gear 603 on the screw 602. In this embodiment, the lead of the screw 602 is 2 mm. That is, the crank handle of the crank system 400 rotates the crank shaft 402 one revolution, which in turn causes the bevel gear shaft 601 to rotate one revolution. Simultaneously, the bevel gear shaft 601 rotates the screw rod 602 one revolution. Each revolution of the screw rod 602 lowers the screw rod sleeve 102 and the pen holder 100 by 2 mm. The screw rod 602 is configured to reset after 11 revolutions. That is, after the pen holder 100 has descended 22 mm, the screw rod 602 resets it.

[0026] In this embodiment, the movable bevel gear 603 is connected to the tool holder slot 203 via a tension spring 604, and cooperates with the limit plate 605 and the limit spring 606 on the base 401 to realize automatic clutch of the transmission. Specifically, the movable bevel gear 603 is movably sleeved on the screw rod 602, and a connecting sleeve 603a is installed below the movable bevel gear 603. A tension spring 604 is provided between the connecting sleeve 603a and the outer side of the tool holder slot 203. When the movable bevel gear 603 is engaged with the bevel gear at the end of the bevel gear shaft 601 for transmission, the tension spring 604 is in an energy storage state; a limit plate 605 is provided on the base 401 of the crank system 400, and the limit plate 605 is pushed to the bottom of the movable bevel gear 603 by the limit spring 606 provided on the base 401 to stop it. In this way, the tension of the tension spring 604 can be overcome, so that the movable bevel gear 603 maintains the transmission relationship with the bevel gear shaft 601. In this embodiment The power for resetting the screw rod 602 comes from the worm spring 607 provided on the outer periphery of the bottom of the screw rod 602. When the screw rod 602 drives the pen holder 100 to descend, the screw rod 602 rotates to cause the worm spring 607 to start storing energy. After the pen holder 100 is lowered into place, the top rod 102a provided on the outer side of the bottom of the screw rod sleeve 102 will push the limiting plate 605 through the cooperation of the inclined surface to overcome the elastic force of the limiting spring 606 and retract into the base 401, thereby leaving the bottom of the movable bevel gear 603. In this way, the movable bevel gear 603 will rely on the tension spring 604 to descend and disengage from the bevel gear shaft 601. In this way, the worm spring 607 of the screw rod 602 can be released to drive the screw rod 602 to rotate quickly in the opposite direction to reset the pen holder 100. During the reset and lifting process of the pen clamp 800, the fixed base 102b at the bottom of its screw sleeve 102 will fork the movable bevel gear 603 and lift it, thereby resetting it to the initial position and re-establishing a transmission relationship with the bevel gear shaft 601. Correspondingly, the limit plate 605 will also be reset under the elastic force of the limit spring 606.

[0027] In this embodiment, the tool holder drive system 500 includes a lever 501 arranged on the base 401, and a second connecting rod assembly 502 connecting one end of the lever 501 and the rocker shaft 402. The second connecting rod assembly 502 can convert the rotational force of the rocker shaft 402 into the reciprocating swing of the lever 501, and the other end of the lever 501 is hinged on a movable sleeve 504 arranged on the outside of the tool holder 200. The movable sleeve 504 is sleeved on the transverse guide rod 503 provided on the tool holder 200. When the lever 501 swings back and forth, the movable sleeve 504 drives the tool holder 200 to move back and forth.

[0028] In this embodiment, a chuck 103 is provided on the top of the pen holder 100 and is linked to the rotor 703. A spring top ball 104 is provided in the chuck 103 to provide clamping force. When in use, the chuck 103 can clamp the pen 800, so that the pen 800 can rise and fall together with the pen holder 100. At the same time, because the chuck 103 is linked to the rotor 703, the chuck 103 will also rotate when the rotor 703 rotates, so that synchronization can be maintained.

[0029] In summary, the overall working steps of this application are: 1. The user turns the handle to generate power.

[0030] 2. The power is split into two paths through the crank shaft 402. One path drives the bevel gear shaft 601 through the crank shaft 402, and then drives the screw rod 602, which drives the pen holder 100 to descend. The other path drives the tool holder 200 to cut through the cooperation of the second connecting rod assembly 502 and the lever 501. 3. After the cutting is completed, the reset is triggered, that is, the worm spring 607 is released to drive the screw rod 602 to reverse, so that the pen holder 100 is lifted; 4. When the pen holder 100 is lifted, the rack 705 drives the half-toothed gear 701, and after a series of transmissions, the cutting die 300 is driven to rotate 90 degrees to cut the next symmetrical surface.

[0031] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A pencil sharpener, characterized in that: include: A pen holder (100) for fixing a pen (800); A blade holder (200) having a blade (201) mounted thereon; The cutting die (300) is provided with a channel for inserting the pen tip and a guide slope (301), and the blade (201) moves along the guide slope (301) to cut the pen tip; A crank system (400) for providing power; A tool holder drive system (500) connects the crank system (400) and the tool holder (200) to convert the rotational motion of the crank system (400) into a linear reciprocating motion of the tool holder (200); The pen holder drive system (600) connects the crank system (400) and the pen holder (100) and converts the rotational motion of the crank system (400) into a descending motion of the pen holder (100); The cutting die driving system (700) is connected to the pen holder (100) and the cutting die (300), and drives the cutting die (300) to rotate when the pen holder (100) is reset and raised to achieve multi-faceted cutting.

2. A pencil sharpener according to claim 1, characterized in that: The cutting die (300) is cylindrical, and four guiding inclined surfaces (301) are provided. The front and rear guiding inclined surfaces (301) and the left and right guiding inclined surfaces (301) are at different distances from the axis of the cutting die (300).

3. A pencil sharpener according to claim 2, characterized in that: The blade (201) is movably mounted on the blade holder (200), and an elastic element (202) is provided between the blade (201) and the blade holder (200) so that the blade (201) always closely adheres to the guide inclined surface (301).

4. A pencil sharpener according to claim 1, characterized in that: It also includes a bottom plate (901) and an anti-overflow cover (902) mounted thereon, wherein the anti-overflow cover (902) surrounds the tool holder (200).

5. A pencil sharpener according to claim 4, characterized in that: A tool holder slide groove (203) is provided in the overflow prevention cover (902), and the tool holder (200) is slidably engaged with the tool holder slide groove (203); A rotating rack (204) is provided on the top of the tool holder slide (203), and a rotating hole (204a) for fixing the cutting mold (300) is provided at the center of the rotating rack (204).

6. A pencil sharpener according to claim 5, characterized in that: The cutting die driving system (700) comprises: A half-toothed gear (701) is provided on the top of the rotating frame (204), wherein the gear shaft (701a) is fixed by a shaft sleeve (204b) provided on the rotating frame (204); A transmission sleeve (702) coaxial with the cutting die (300) is provided with a raised limiting portion (702a) on its inner side; A rotor (703) fixed to the cutting die (300) has a wave groove (703a) on its outer circumference that cooperates with the raised limiting portion (702a); a first connecting rod assembly (704) connecting the half-tooth gear (701) and the transmission sleeve (702); A rack (705) is provided on the side of the pen holder (100). When the pen holder (100) is lifted, the rack (705) drives the half-tooth gear (701) to rotate, and drives the transmission sleeve (702) to rise and fall through the first connecting rod assembly (704), so that the raised limiting portion (702a) moves along the wave groove (703a), driving the rotor (703) and the cutting die (300) to rotate.

7. A pencil sharpener according to claim 6, characterized in that: The pen holder drive system (600) includes a bevel gear shaft (601) and a screw rod (602). The screw rod (602) is vertically arranged and rotatably arranged next to the tool holder (200). The pen holder (100) is provided with an integral screw rod sleeve (102). The screw rod sleeve (102) is spirally connected to the screw rod (602). A base (401) for mounting the bevel gear shaft (601) is provided on the bottom plate (901). The crank system (400) is provided with a crank shaft (402). The crank shaft (402) is mounted on the base (401). The two ends of the bevel gear shaft (601) are respectively connected to the crank shaft (402) and the screw rod (602).

8. A pencil sharpener according to claim 7, characterized in that: The screw rod (602) is provided with a movable bevel gear (603) for transmission, which is movably sleeved on the screw rod (602); A connecting sleeve (603a) is sleeved below the movable bevel gear (603), and a tension spring (604) is provided between the connecting sleeve (603a) and the tool holder slide groove (203); A limiting piece (605) and a limiting spring (606) are provided on the base (401), and the limiting piece (605) is pushed to the bottom of the movable bevel gear (603) under the action of the limiting spring (606); A worm spring (607) is provided at the bottom of the screw rod (602); A top rod (102a) that cooperates with the limiting piece (605) is provided at the bottom of the screw sleeve (102); When the pen holder (100) is lowered into place, the push rod (102a) pushes the limiting plate (605) to compress the limiting spring (606) and retract it, so that the movable bevel gear (603) is separated from the bevel gear shaft (601) under the action of the tension spring (604), and the spiral spring (607) drives the screw rod (602) to reverse and reset.

9. A pencil sharpener according to claim 8, characterized in that: The tool holder driving system (500) comprises: A lever (501) hinged to the base (401); a second connecting rod assembly (502) connecting the crank shaft (402) and the lever (501); A transverse guide rod (503) provided on the tool holder (200); A movable sleeve (504) is sleeved on the transverse guide rod (503), and the end of the lever (501) is hinged to the movable sleeve (504).

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