A pencil sharpener

Abstract

The utility model discloses a pencil sharpener, and one-way rotation of the user can realize automatic pencil sharpening. The power of the handle is divided, one way is through the pencil holder drive system to make the pencil holder descend at a constant speed, and the pencil is inserted into the cutting mold; the other way is through the cutter drive system to drive the blade to reciprocatingly cut along the guide slope. When the pencil holder descends to the predetermined position, the volute spring triggers the reset, the pencil holder is lifted, and the cutting mold rotates 90 DEG to switch the cutting surface. The pencil sharpener precisely matches the cutting amount through the lead screw lead and the handle circle number, realizes automatic reset and surface switching through the transmission mechanism, and does not need manual intervention. It can precisely cut out specific shapes such as flat head eyebrow pencils, is simple and easy to operate, avoids pencil dust splashing and blade injury through the anti-overflow cover design, and has high efficiency and safety.

Description

Technical Field

[0001] This utility model relates to the field of daily necessities, specifically to a pencil sharpener. Background Technology

[0002] In the beauty industry, pencils such as eyebrow pencils often need to be sharpened into specific shapes, such as flat tips, to meet usage requirements. Most existing pencil sharpeners are designed for ordinary writing pens and are insufficient for precisely sharpening eyebrow pencils into the desired shape. Therefore, there is an urgent need for a pencil sharpener that can solve this problem. Utility Model Content

[0003] In view of the above, the purpose of this utility model is to provide a pencil sharpener in response to the problems of the prior art.

[0004] A pencil sharpener according to this solution is characterized by comprising:

[0005] Pen clip for holding pens in place;

[0006] A knife holder, equipped with a blade;

[0007] A cutting die is provided with a channel for inserting a pen tip and a guide slope, and the blade moves along the guide slope to cut the pen tip;

[0008] The crank system is used to provide power;

[0009] The tool post drive system connects the crank system and the tool post, converting the rotational motion of the crank system into the linear reciprocating motion of the tool post.

[0010] 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.

[0011] 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 lifted to achieve multi-faceted cutting.

[0012] Furthermore, the cutting mold is cylindrical, with four guide slopes at its bottom, and the distances between the front and rear guide slopes and the left and right guide slopes and the axis of the cutting mold are different.

[0013] Furthermore, the blade is movably mounted on the tool holder, and an elastic element is provided between the blade and the tool holder to ensure that the blade is always in close contact with the guide slope.

[0014] Furthermore, it also includes a base plate and an overflow shield mounted thereon, the overflow shield surrounding the tool holder.

[0015] Furthermore, the overflow cover is provided with a tool holder slide groove, and the tool holder slides in conjunction with the tool holder slide groove;

[0016] The top of the tool holder slide is equipped with a rotating frame, and the center of the rotating frame has a rotating hole for fixing the cutting mold.

[0017] Furthermore, the cutting die driving system includes:

[0018] The half-tooth gear located at the top of the rotating frame has its gear shaft fixed by a bushing set on the rotating frame;

[0019] The transmission sleeve, which is coaxial with the cutting die, has a protruding limiting part on its inner side;

[0020] The rotor, fixed to the cutting die, has a wave groove on its outer periphery that mates with the protruding limiting part;

[0021] The first connecting rod assembly that connects the half-tooth gear and the transmission sleeve;

[0022] The rack located on the side of the pen holder drives the half-tooth gear to rotate when the pen holder is raised. This rotation, through the first connecting rod assembly, causes the transmission sleeve to rise and fall, making the protruding limiting part move along the wave groove, thereby driving the rotor and the cutting mold to rotate.

[0023] Furthermore, the pen holder drive system includes a bevel gear shaft and a lead screw. The lead screw is vertically and rotatably positioned next to the tool holder. The pen holder has an integrally formed lead screw sleeve, which is helically connected to the lead screw. A base for mounting the bevel gear shaft is provided on the base plate. The crank system has a crank shaft, which is mounted on the base. Both ends of the bevel gear shaft are respectively connected to the crank shaft and the lead screw for transmission.

[0024] Furthermore, the lead screw is provided with movable bevel teeth for transmission, which are movably sleeved on the lead screw;

[0025] A connecting sleeve is fitted below the movable bevel tooth, and a tension spring is provided between the connecting sleeve and the tool holder slide groove;

[0026] The base is equipped with a limiting plate and a limiting spring. The limiting plate is pushed to the bottom of the movable bevel teeth under the action of the limiting spring.

[0027] A worm spring is provided at the bottom of the lead screw;

[0028] The bottom of the lead screw sleeve is provided with a push rod that cooperates with the limiting plate;

[0029] When the pen holder descends to its final position, the push rod pushes the limiting plate to compress the limiting spring and retract, causing the movable bevel gear to disengage from the bevel gear shaft under the action of the tension spring. The worm spring then drives the lead screw to reverse and reset.

[0030] Furthermore, levers hinged to the base;

[0031] The second linkage assembly connecting the crank shaft and the lever;

[0032] A transverse guide rod is installed on the tool holder;

[0033] A movable sleeve is fitted onto the transverse guide rod, and the lever end is hinged to the movable sleeve.

[0034] Beneficial effects:

[0035] 1. It can accurately achieve multi-faceted cutting of the pen, meeting the sharpening needs of specific shapes such as flat-tipped eyebrow pencils.

[0036] 2. Easy to operate, only requires continuous one-way rotation of the crank handle, no need to manually adjust the feed, cutting or changing the surface, the pencil sharpening process is fully automated.

[0037] 3. It has an automatic cycle function. When the pen barrel descends to the predetermined position, the worm spring and the transmission clutch mechanism (movable bevel teeth, limit plate, etc.) are automatically triggered to reset. While the pen holder is raised, the cutting mold rotates and changes face. It can enter the next round of cutting without manual intervention. It is suitable for continuous forming of multi-faceted pen tips (such as four-sided cutting). Attached Figure Description

[0038] Figure 1 This is a three-dimensional structural diagram of the present application;

[0039] Figure 2 , Figure 3 , Figure 4 These are schematic diagrams of the structure of this application from different perspectives after the spill cover has been removed.

[0040] Figure 5 This is a cross-sectional schematic diagram of this application;

[0041] Figure 6 This is a schematic diagram illustrating the fit between the cutting mold and the pen in this application;

[0042] Figure 7 This is a schematic diagram of the tool holder structure of this application;

[0043] Figure 8 This is a schematic diagram of the assembly structure of the limiting piece in this application;

[0044] Figure 9 , Figure 10 This is a schematic diagram of the different states of the tool post drive system of this application;

[0045] Figure 11 This is a schematic diagram showing the movable bevel teeth in the meshing state.

[0046] Figure 12 A schematic diagram showing the movable bevel gear in the engaged state and the bevel gear shaft disengaged state.

[0047] Figure 13 This is a schematic diagram of the pen holder drive system;

[0048] Figure 14A schematic diagram illustrating the working state of the pen holder drive system;

[0049] Figure 15 This is a schematic diagram showing the changes in the fit between the rotor and the transmission sleeve.

[0050] Figure 16 This is a schematic diagram showing the changes in the working state of the first linkage drive assembly.

[0051] Figure 17 An exploded view of the pen holder structure;

[0052] Reference numerals: Pen holder 100, lead screw sleeve 102, top rod 102a, base 102b, chuck 103, spring ball bearing 104, tool holder 200, blade 201, elastic element 202, tool holder slide 203, rotating frame 204, rotating hole 204a, bushing 204b, cutting die 300, guide slope 301, crank system 400, base 401, crank shaft 402, tool holder drive system 500, lever 501, second linkage assembly 502, transverse guide rod 503, movable 504 sleeve, pen holder drive system 600, bevel gear shaft 601, lead screw 602, movable bevel gear 603, connecting sleeve 603a, tension spring 604, limiting plate 605, limiting spring 606, worm spring 607, shaping die drive system 700, half gear 701, gear shaft 701a, transmission sleeve 702, protruding limiting part 702a, rotor 703, wave groove 703a, first connecting rod assembly 704, rack 705, torsion spring 706, pen 800, base plate 901, spill cover 902. Detailed Implementation

[0053] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0054] Reference Figures 1 to 17 A pencil sharpener shown includes:

[0055] Pen clip 100, used to hold pen 800;

[0056] Tool holder 200, with blade 201 mounted on it;

[0057] 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;

[0058] The crank system 400 is used to provide power;

[0059] The tool post drive system 500 connects the crank system 400 and the tool post 200, converting the rotational motion of the crank system 400 into the linear reciprocating motion of the tool post 200.

[0060] 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.

[0061] The cutting die drive system 700 connects the pen holder 100 and the cutting die 300. When the pen holder 100 is reset and lifted, it drives the cutting die 300 to rotate to achieve multi-face cutting.

[0062] In this embodiment, the shaping mold, as a forming component, has a cylindrical hollow structure design, allowing the pen 800 to be inserted. Taking the eyebrow pencil 800 shaping mold as an example, it needs to be shaped into a flat-tipped pen 800. Its bottom is designed with four guide bevels 301 to match the special requirements of the flat-tipped eyebrow pencil 800. More specifically, in this embodiment, differentiated removal amounts are achieved during the cutting process by controlling the distance difference between the front and rear guide bevels 301 and the left and right guide bevels 301 to the axis. Only a suitable amount of pen 800 rod and part of pen 800 core are removed from the left and right sides, while more pen 800 rod and most of pen 800 core are removed from the front and rear, thereby shaping a flat pen tip shape that meets makeup requirements. Because of the different positions of the guide bevels 301, in this embodiment, the blade 201 is designed to be movably fixed on the blade holder 200, and the elastic element 202 provides elasticity to keep the blade 201 always in close contact with the shaping mold 300. This ensures that the blade 201 cuts along a predetermined path whether cutting the front and rear or the left and right sides. The elastic element 202 can be a spring or other elastic device.

[0063] In this embodiment, the cutting die driving system 700 is used to drive the cutting die 300 to rotate 90 degrees each time. The meaning of rotation is that after cutting the front and back of the pen tip, the pen holder 100 returns to its original position and rises. The cutting die driving system 700 converts the rising motion into the rotational motion of the cutting die 300, so that the cutting die 300 can rotate 90 degrees to cut the other two sides.

[0064] In this embodiment, the application also includes a base plate 901, on which an anti-overflow cover 902 is installed to surround the tool holder 200, preventing pen shavings from flying and also preventing accidental damage to the blade 201. Within the area surrounded by the anti-overflow cover 902, there is a tool holder slide groove 203 that guides the linear reciprocating lifting and lowering motion of the tool holder 200. The tool holder 200 slides in conjunction with the tool holder slide groove 203. A gantry-type rotating frame 204 is installed on top of the tool holder slide groove 203, and the rotating frame 204 has a rotating hole 204a at its center for fixing the cutting die 300.

[0065] In this embodiment, the shaping die driving system 700 includes a half-tooth gear 701 in a fixed position. The half-tooth gear 701 has a gear shaft 701a, which is fixed by a bushing 204b disposed on one side of the top of the rotating frame 204. The shaping die driving system 700 also includes a transmission sleeve 702 disposed above the center of the rotating frame 204 and coaxial with the shaping die 300. The transmission sleeve 702 contains a rotor 703, which is integrally disposed with the shaping die 300. The outer side of the rotor 703 has a wave groove 703a disposed along the outer periphery. The inner side of the transmission sleeve 702 has a protruding limiting part 702a that cooperates with the wave groove 703a. A first connecting rod assembly 704 is disposed between the transmission sleeve 702 and the half-tooth gear 701. The shaping die driving system 700 also includes a rack 705 disposed on the side of the pen holder 100. The principle of this system is as follows: when the pen holder 100 is raised, the rack 705 can drive the half gear 701 to rotate. When the half gear 701 rotates, the rotational motion is converted into the lifting motion of the transmission sleeve 702 through the first connecting rod assembly 704. When the transmission sleeve 702 lifts, the rotor 703 and the cutting mold 300 can be driven to rotate 90 degrees through the cooperation of the protruding limiting part 702a and the wave groove 703a.

[0066] It should be noted that the toothed half of the semi-gear 701 is initially facing downwards, and there is a torsion spring 706 on the gear shaft 701a. From the front view, when the pen holder 100 descends, because the toothed half of the semi-gear 701 is facing downwards, the rack 705 can only contact one tooth when it moves downwards, and then the next tooth is the smooth surface. The semi-gear 701 is pressed down by the torsion spring 706, so the semi-gear 701 will not be driven to rotate.

[0067] When the rack 705 moves upward, it will drive the half-tooth gear 701 to rotate half a revolution and then derail, and be brought back to the initial state by the torsion spring 706.

[0068] In this embodiment, the pen holder drive system 600 includes a bevel gear shaft 601 and a lead screw 602. The lead screw 602 is vertically and rotatably positioned next to the tool holder 200. The pen holder 100 has an integrally formed lead screw sleeve 102 that is helically connected to the lead screw 602. The bevel gear shaft 601 is horizontally mounted in a base 401 mounted on a base plate 901. The crank shaft 402 of the crank system 400 is also mounted on the base 401. The two ends of the bevel gear shaft 601 mesh with fixed bevel teeth on the crank shaft 402 and movable bevel teeth 603 on the lead screw 602, respectively. In this embodiment, the lead of the lead screw 602 is 2 mm. That is, the crank of the crank system 400 drives the crank shaft 402 to rotate one revolution, the bevel gear shaft 601 to rotate one revolution, and the bevel gear shaft 601 drives the lead screw 602 to rotate one revolution. The lead screw 602 rotates one revolution, causing the lead screw sleeve 102 and the pen holder 100 to drop 2mm. At the same time, the lead screw 602 is set to reset after 11 revolutions, that is, after the pen holder 100 drops 22mm, the lead screw 602 drives it to reset.

[0069] In this embodiment, the movable bevel gear 603 is connected to the tool holder slide groove 203 via a tension spring 604, and works in conjunction with the limiting plate 605 and the limiting spring 606 on the base 401 to achieve automatic engagement and disengagement of the transmission. Specifically, the movable bevel gear 603 is movably sleeved on the lead screw 602, and a connecting sleeve 603a is fitted 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 slide groove 203. When the movable bevel gear 603 engages 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 limiting plate 605 is provided on the base 401 of the crank system 400. The limiting plate 605 is pushed below the movable bevel gear 603 by the limiting spring 606 on the base 401 to stop it. This can overcome the tension of the tension spring 604 and keep the movable bevel gear 603 in a transmission relationship with the bevel gear shaft 601. In this embodiment... The power for the reset of the lead screw 602 comes from the worm spring 607 set on the outer periphery of the bottom of the lead screw 602. When the lead screw 602 drives the pen holder 100 to descend, the rotation of the lead screw 602 causes the worm spring 607 to start storing energy. After the pen holder 100 descends to the position, the top rod 102a set on the outer side of the bottom of its lead screw sleeve 102 will push the limiting plate 605 through the cooperation of the inclined surface, so that it overcomes the elastic force of the limiting spring 606 and retracts into the base 401, thereby moving away from the bottom of the movable bevel tooth 603. In this way, the movable bevel tooth 603 will descend by relying on the tension spring 604 and disengage from the bevel tooth shaft 601. In this way, the worm spring 607 of the lead screw 602 can be released, driving the lead screw 602 to rotate quickly in the opposite direction and reset the pen holder 100. During the resetting and lifting process of the pen clip 800, the fixed base 102b at the bottom of its lead screw sleeve 102 will lift the movable bevel tooth 603 and reset it to the initial position to re-establish the transmission relationship with the bevel tooth shaft 601. Correspondingly, the limiting piece 605 will also reset under the elastic force of the limiting spring 606.

[0070] In this embodiment, the tool holder drive system 500 includes a lever 501 mounted on a base 401 and a second linkage assembly 502 connecting one end of the lever 501 and the crank shaft 402. The rotational force of the crank shaft 402 can be converted into the reciprocating swing of the lever 501 through the second linkage assembly 502. The other end of the lever 501 is hinged to a movable sleeve 504 mounted on the outside of the tool holder 200. The movable sleeve 504 is mounted on a transverse guide rod 503 mounted on the tool holder 200. When the lever 501 swings back and forth, the movable sleeve 504 drives the tool holder 200 to reciprocate up and down.

[0071] In this embodiment, the top of the pen holder 100 is provided with a chuck 103 that is linked to the rotor 703. The chuck 103 is provided with a spring ball 104 that can provide clamping force. When in use, the chuck 103 can clamp the pen 800, so that the pen 800 rises and falls 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.

[0072] In summary, the overall working steps of this application are as follows:

[0073] 1. The user turns the crank to generate power.

[0074] 2. The flow is split into two paths through the crank shaft 402. One path drives the bevel gear shaft 601 through the crank shaft 402, which in turn drives the lead screw 602, which in turn drives the pen holder 100 to descend. The other path drives the tool holder 200 to perform cutting through the cooperation of the second connecting rod assembly 502 and the lever 501.

[0075] 3. After the cutting is completed, the reset is triggered, that is, the worm spring 607 is released, which drives the lead screw 602 to reverse, causing the pen holder 100 to rise;

[0076] 4. When the pen holder 100 is lifted, it drives the half-tooth gear 701 through the rack 705. After a series of transmissions, it drives the cutting mold 300 to rotate 90 degrees to cut the next symmetrical plane.

[0077] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A pencil sharpener, characterized in that, include: Pen clip (100) for holding a pen (800); Tool holder (200), with blade (201) mounted on it; 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; The crank system (400) is used to provide power; The tool post drive system (500) connects the crank system (400) and the tool post (200), converting the rotational motion of the crank system (400) into the linear reciprocating motion of the tool post (200); The pen holder drive system (600) connects the crank system (400) and the pen holder (100), converting the rotational motion of the crank system (400) into the downward motion of the pen holder (100); The cutting die drive 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 lifted to achieve multi-face cutting.

2. A pencil sharpener according to claim 1, characterized in that, The cutting mold (300) is cylindrical, and there are four guide slopes (301), and the distances between the front and rear guide slopes (301) and the left and right guide slopes (301) and the axis of the cutting mold (300) are different.

3. A pencil sharpener according to claim 2, characterized in that, The blade (201) is movably mounted on the tool holder (200), and an elastic element (202) is provided between the blade (201) and the tool holder (200) to ensure that the blade (201) is always in close contact with the guide slope (301).

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

5. A pencil sharpener according to claim 4, characterized in that, The overflow cover (902) is provided with a tool holder slide groove (203), and the tool holder (200) slides in conjunction with the tool holder slide groove (203); The top of the tool holder slide (203) is provided with a rotating frame (204), and the center of the rotating frame (204) is provided with a rotating hole (204a) for fixing the cutting mold (300).

6. A pencil sharpener according to claim 5, characterized in that, The die-cutting drive system (700) includes: The half-tooth gear (701) located on the top of the rotating frame (204) has its gear shaft (701a) fixed by a bushing (204b) located on the rotating frame (204); The transmission sleeve (702) is coaxial with the cutting mold (300), and its inner side is provided with a protruding limiting part (702a). The rotor (703) fixed to the cutting die (300) has a wave groove (703a) on its outer periphery that cooperates with the protruding limiting part (702a). The first link assembly (704) connects the half gear (701) and the transmission sleeve (702). The rack (705) located on the side of the pen holder (100) drives the half gear (701) to rotate when the pen holder (100) is raised. This drives the transmission sleeve (702) to rise and fall through the first connecting rod assembly (704), causing the protruding limiting part (702a) to move along the wave groove (703a), thereby driving the rotor (703) and the cutting mold (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 lead screw (602). The lead screw (602) is vertically and rotatably mounted next to the knife holder (200). The pen holder (100) is provided with an integrally mounted lead screw sleeve (102). The lead screw sleeve (102) is helically connected to the lead screw (602). A base (401) for mounting the bevel gear shaft (601) is provided on the base 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 lead screw (602).

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

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

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