Knife body, knife rest and pencil sharpener

Abstract

The embodiment of the utility model discloses a knife body, a knife rest and a pencil sharpener. Wherein the cutter body comprises a main body, the main body is provided with a first end and a second end, the main body comprises a cutter point part and an avoiding part, the cutter point part is close to the first end of the main body, the avoiding part is close to the second end of the main body, and the main body is provided with a planetary gear; wherein the body is provided with a cutting edge, and the cutting edge is only arranged on the side wall of the blade point part; the avoiding part is used for avoiding a pencil holder of the pencil, and the blade point part is used for grinding a pencil lead of the pencil. The knife body is used for grinding a wood-free pencil, and the avoiding part on the knife body can effectively avoid a pencil holder to prevent the cutting edge of the knife point part from damaging the pencil holder or damaging the pencil sharpener. The pencil sharpener further provides a motor control circuit, and after the motor control circuit is matched with the advancing and retreating assembly, a pencil can automatically move towards the inner side or the outer side of the pencil sharpener.

Description

Technical Field

[0001] This application relates to a knife holder and a pencil sharpener. Background Technology

[0002] Pencils are a common writing instrument. Traditional pencils are made of wood with a lead core embedded in the center. When using a pencil, a sharpener is needed to remove a portion of the wood to expose the lead. With increasing environmental awareness, eco-friendly, recyclable, and lightweight woodless pencils (eco-friendly pencils) have become the preferred choice for many. One type of woodless pencil has a barrel made of plastic or biodegradable materials, with a lead core extending from the end of the barrel. Traditional rotary sharpeners remove a portion of the wood before sharpening the lead. However, woodless pencils, made of plastic or biodegradable materials, do not require sharpening. Therefore, traditional rotary sharpeners can damage the pencil barrel and / or the sharpener itself when sharpening woodless pencils, a problem that urgently needs to be addressed. Summary of the Invention

[0003] This application provides a blade body, a blade holder, and a pencil sharpener to solve at least one technical problem in the prior art.

[0004] The first aspect of this application provides a blade body applied to a rotary blade holder, which includes a body having a first end and a second end. The body includes a blade edge and a clearance portion, the blade edge being close to the first end of the body and the clearance portion being close to the second end of the body. The body is provided with a planetary gear.

[0005] The body is provided with a blade, and the blade is only provided on the side wall of the blade portion; the avoidance portion is used to avoid the pencil barrel, and the blade portion is used to sharpen the pencil lead.

[0006] In some implementations, the outer diameter of the blade portion is larger than the outer diameter of the clearance portion.

[0007] A second aspect of this application provides a blade holder for use with a rotary pencil sharpener, the pencil sharpener including a base, a frame, and the aforementioned blade body;

[0008] The frame is provided with a first end and a second end along the rotation axis, with the first end facing the base and the second end having a through first channel along the rotation axis; the blade is provided on the side of the frame, with the first end of the blade rotatably connected to the first end and the second end of the blade rotatably connected to the second end.

[0009] Wherein, the vertical distance between the rotation center of the first end of the blade and the rotation axis is less than the vertical distance between the rotation center of the second end of the blade and the rotation axis.

[0010] In some implementations, the first end is provided with a first connecting seat, the second end is provided with a second connecting seat, the first end of the blade is rotatably connected to the first connecting seat, and the second end of the blade is rotatably connected to the second connecting seat.

[0011] In some embodiments, the first channel has a tapered end, which is located inside the blade holder and is used to limit the insertion depth of the pencil.

[0012] In some embodiments, an outer support is sleeved on the outside of the tool holder, and an internal gear ring is provided on the inner wall of the outer support. The internal gear ring meshes with the planetary gear of the tool body.

[0013] The tool holder can rotate within the outer support around the rotation axis and drive the tool body to rotate on the tool holder.

[0014] A third aspect of this application provides a pencil sharpener, which includes a base and the aforementioned blade holder;

[0015] The first end of the tool holder is provided with a first interface, and the base is provided with a rotatable third interface. The first interface and the third interface are connected in cooperation, and the outer bracket is relatively stationary on the base.

[0016] The tool holder can be rotated within the outer support around the rotation axis by driving the third interface.

[0017] In some implementations, a motor is also included, which can drive the third interface to rotate on the base.

[0018] In some embodiments, the device further includes a housing and a top cover, wherein a first end of the housing is connected to the base and the blade holder is disposed within the housing, and the top cover is disposed at a second end of the housing;

[0019] The second end of the tool holder is provided with a second interface;

[0020] The top cover has a through hole, and the top cover has an inward and outward assembly. The inward and outward assembly has a fourth interface, and the second interface is connected to the fourth interface.

[0021] The blade holder can drive the forward and backward assembly when it rotates, and the forward and backward assembly can move the pencil inserted into the through hole toward the inside or outside of the pencil sharpener.

[0022] In some implementations, a circuit board is also included, on which a motor control circuit is provided, which can change the connection relationship between the first and second electrodes of the motor and the positive and negative electrodes of the power supply circuit.

[0023] Specifically, when the first electrode is electrically connected to the positive electrode and the second electrode is electrically connected to the negative electrode, the motor can rotate in a first direction; when the first electrode is electrically connected to the negative electrode and the second electrode is electrically connected to the positive electrode, the motor can rotate in a second direction.

[0024] Compared with existing technologies, the advantages of this application are that the blade of this application, when sharpening woodless pencils, has a clearance section that effectively avoids damage to the pencil barrel by the blade tip, preventing damage to the pencil barrel or the pencil sharpener itself. The blade of this application is compatible with traditional rotary pencil sharpeners, reducing the adaptation cost of traditional pencil sharpeners. Furthermore, the pencil sharpener of this application also provides a motor control circuit that can control the motor to rotate clockwise or counterclockwise. When used with the advance / retractor assembly, it allows the pencil to automatically move towards the inside or outside of the pencil sharpener. Attached Figure Description

[0025] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. Wherein:

[0026] Figure 1 This is a schematic diagram of the overall structure of a pencil sharpener according to an embodiment of this application;

[0027] Figure 2 and Figure 3 for Figure 1 An explosion diagram.

[0028] Figure 4 This is a schematic diagram of the overall structure of a tool holder according to an embodiment of this application;

[0029] Figure 5 for Figure 1 A cross-sectional view along the AA direction;

[0030] Figure 6 for Figure 5 A magnified view of a portion of point B in the middle;

[0031] Figure 7 for Figure 6 A schematic diagram of a medium-sized pencil in a grinding state;

[0032] Figure 8 for Figure 1 A diagram showing a pencil sharpener without its top cap attached.

[0033] Figure 9 for Figure 8 A magnified view of a portion of the image;

[0034] Figure 10 This is a schematic diagram of the top cover structure in an embodiment of this application;

[0035] Figure 11 This is a schematic diagram of one type of motor control circuit in the embodiments of this application.

[0036] Explanation of reference numerals in the attached figures:

[0037] 100- Pencil sharpener;

[0038] 10-Tool holder; 101-Frame; 102-First end; 1021-First interface; 1022-First connecting seat; 103-Second end; 1031-Second interface; 1032-Second connecting seat; 104-First channel; 1041-Conical end; 105-Tool body; 1051-Blade edge; 1052-Allowing part; 1053-Planetary gear; 1054-Shaft;

[0039] 20-Outer support; 201-Cavity; 202-Internal gear ring; 203-Window;

[0040] 30-Driver assembly; 301-Third interface; 302-Motor; 303-Circuit board; 304-Switch;

[0041] 40 - Base; 401 - Boss;

[0042] 50 - Housing; 501 - Viewing window;

[0043] 60-Top cover; 6011-Lower cover; 6012-Upper cover; 602-Through hole; 603-Forward / backward assembly; 6031-Main gear; 6032-Fourth interface; 6033-Second channel; 6034-First roller; 6035-First shaft; 6036-First gear; 6037-Second roller; 6038-Second shaft; 6039-Second gear; 700-Environmentally friendly pencil; 701-Lead core; 702-Pen cap. Detailed Implementation

[0044] The present application will now be described in detail with reference to the accompanying drawings and embodiments. Various examples are provided by way of explanation and not by way of limitation. In fact, those skilled in the art will recognize that modifications and variations can be made to the present application without departing from the scope or spirit thereof. For example, a feature shown or described as part of one embodiment may be used in another embodiment to produce yet another embodiment. Therefore, it is desirable that the present application encompass such modifications and variations that fall within the scope of the appended claims and their equivalents.

[0045] In the description of this application, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," and "bottom," etc., 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 application and do not require that this application be constructed and operated in a specific orientation, and therefore should not be construed as limiting this application. The terms "connected," "linked," and "set up" used in this application should be interpreted broadly. For example, they can refer to fixed connections or detachable connections; direct connections or indirect connections through intermediate components; wired connections, radio connections, or wireless communication signal connections. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0046] The accompanying drawings illustrate one or more examples of this application. The detailed description uses numerical and alphabetic designations to refer to features in the drawings. Similar or analogous designations in the drawings and description have been used to refer to similar or analogous parts of this application. As used herein, the terms “first,” “second,” and “third,” etc., are used interchangeably to distinguish one component from another and are not intended to indicate the location or importance of individual components.

[0047] like Figures 1 to 3 As shown, according to an embodiment of this application, a rotary pencil sharpener 100 is provided, which includes a housing 50, a top cover 60 on the top of the housing 50, and a base 40 on the bottom. The housing 50 contains a rotatable blade holder 10 and an outer support 20 disposed outside the blade holder 10.

[0048] The outer support 20 is stationary relative to the housing 50. The outer support 20 is provided with a longitudinally extending cavity 201. The tool holder 10 is disposed in the cavity 201 and can rotate around the longitudinal axis within the cavity 201.

[0049] like Figure 4 and Figure 6As shown, in some embodiments, the tool holder 10 includes a frame 101. The frame 101 has a first end 102 and a second end 103 along its axial direction, with the first end 102 facing the base 40 and the second end 103 facing the top cover 60. The first end 102 of the frame 101 has a first connecting seat 1022, and the second end 103 has a second connecting seat 1032. A rotatable cylindrical tool body 105 is provided on the side of the frame 101, wherein the first end of the tool body 105 is rotatably connected to the first connecting seat 1022 via a pivot 1054, and the second end of the tool body 105 is rotatably connected to the second connecting seat 1032 via a pivot 1054. The vertical distance between the rotation center of the first end of the blade 105 and the axis L1 of the frame 101 is D1, and the vertical distance between the rotation center of the second end of the blade 105 and the axis L1 of the frame 101 is D2, where D1 is less than D2; the angle between the side L2 of the blade 105 facing the axis L1 of the frame 101 and the axis L1 of the frame 101 (the angle in the pencil insertion direction) is an acute angle. The blade 105 includes a cutting edge 1051 and a clearance part 1052, wherein the cutting edge 1051 faces the first end 102 of the frame 101 and has a plurality of spiral cutting edges for grinding the lead core 701; the clearance part 1052 faces the second end 103 of the frame 101. The second end 103 of the frame 101 is provided with a through first channel 104, through which a pencil is inserted into the knife holder 10, and the axis of the first channel 104 is the same as the axis of the knife holder 10.

[0050] like Figures 4 to 6 , Figure 9 As shown, a planetary gear 1053 is provided at the second end of the blade body 105. An internal gear ring 202 is provided at the end of the outer support 20 facing the top cover 60. The internal gear ring 202 is disposed on the inner wall of the cavity of the outer support 20 and meshes with the planetary gear 1053. When the blade holder 10 rotates within the outer support 20, the blade body 105 rotates under the cooperation of the planetary gear 1053 and the internal gear ring 202. Figure 6 and Figure 7 As shown, when the pencil is inserted into the pencil sharpener 100 and moves downward, the pencil cap 702 and the tip of the lead 701 gradually approach the blade 1051 of the sharpener body 105. While the blade 1051 sharpens the tip of the lead 701, the pencil cap 702 is located in the clearance portion 1052 of the sharpener body 105. Since the clearance portion 1052 of the sharpener body 105 has no cutting edge, and the sharpener body 105 forms an acute angle with the insertion direction of the pencil, the sharpener body 105 will not contact the pencil cap 702, thereby preventing damage to the pencil and / or the sharpener 100.

[0051] In some embodiments, the outer diameter of the avoidance portion 1052 is smaller than the outer diameter of the blade portion 1051, further preventing the blade body 105 from contacting the pen barrel.

[0052] The blade body 105 structure is compatible with traditional rotary pencil sharpeners 100; or, a traditional rotary pencil sharpener 100 can have its blade body 105 replaced to meet the sharpening needs of woodless pencils. The length of the blade body 105, the length and outer diameter of the clearance portion 1052, the length and outer diameter of the blade tip 1051, and the outer diameter and tooth profile of the planetary gear 1053 can all be set according to requirements to match different pencil sharpeners 100; no specific limitations are imposed here. Of course, the planetary gear 1053 can also be located at any position of the clearance portion 1052 or at the end of the blade tip 1051; again, no specific limitations are imposed here.

[0053] like Figure 4 , Figure 6 and Figure 7 As shown, in some embodiments, the first channel 104 of the blade holder 10 has a tapered end 1041, which is located on the inner side of the blade holder 10. After the pencil is inserted into the blade holder 10 along the first channel 104, the depth of insertion is limited by the position of the tapered end 1041 and the contact position between the pencil barrel and the inner wall of the tapered end 1041. Alternatively, after the pencil is inserted to a preset position, the pencil cap 702 abuts against the inner wall of the tapered end 1041, thereby limiting further insertion. This prevents the pencil from being over-inserted and causing the pencil barrel to contact the blade 1051.

[0054] In some embodiments, such as Figure 2 and Figure 3 The rotary pencil sharpener 100 shown has a drive assembly 30 on a base 40. The drive assembly 30 includes a motor 302 and a third interface 301. The third interface 301 is located on the top of the base 40, and the motor 302 is located inside the base 40. The third interface 301 is connected to the output end of the motor 302. The first end 102 of the blade holder 10 has a first interface 1021, which is connected to the third interface 301. The blade holder 10 can rotate around an axis under the drive of the motor 302.

[0055] In some embodiments, the first interface 1021 is provided with a groove, and the sidewall of the groove is provided with slots distributed circumferentially thereon; the outer wall of the third interface 301 is provided with a block distributed circumferentially thereon; the block can be selectively inserted into the groove and engaged with it.

[0056] In some embodiments, the drive assembly 30 further includes a speed reducer disposed between the motor 302 and the third interface 301. The speed reducer can reduce the output speed of the motor 302 to a preset range. Of course, some motors 302 integrate a speed reducer, which can also achieve the function of speed reduction.

[0057] In some embodiments, the top of the base 40 is provided with a boss 401, the third interface 301 is provided at the center of the boss 401, and the bottom of the outer bracket 20 is sleeved on the outside of the boss 401 and has a clearance fit with the boss 401.

[0058] like Figure 2 , Figure 9 and Figure 10 As shown, in some embodiments, the top cover 60 has a through hole 602, through which a pencil can pass and be inserted into the tool holder 10. The top cover 60 includes an upper cover 6012 and a lower cover 6011. The through hole 602 includes an upper hole in the upper cover 6012 and a lower hole in the lower cover 6011. The top cover 60 has a forward / reverse assembly 603, which includes a main gear 6031. The main gear 6031 has a fourth interface 6032 and a second channel 6033 passing through the main gear 6031 and the fourth interface 6032. The fourth interface 6032 extends out of the top cover 60 from the lower hole of the lower cover 6011 and can rotate within the lower hole. The second end 103 of the tool holder 10 has a second interface 1031, which is engaged with the portion of the fourth interface 6032 extending out of the top cover 60. The main gear 6031 can rotate around its axis under the drive of the tool holder 10. The forward / backward assembly 603 also includes a first roller 6034 and a second roller 6037, which are located on the same plane. The first roller 6034 is rotatably connected to the lower cover 6011 via a first rotating shaft 6035, and the second roller 6037 is rotatably connected to the lower cover 6011 via a second rotating shaft 6038. A first gear 6036 is mounted on the first rotating shaft 6035 and meshes with the main gear 6031; a second gear 6039 is mounted on the second rotating shaft 6038 and meshes with the main gear 6031; the first gear 6036 and the second gear 6039 are located on opposite sides of the main gear 6031. The main gear 6031 drives the first roller 6034 and the second roller 6037 to rotate via the first gear 6036 and the second gear 6039, respectively. Since the first gear 6036 and the second gear 6039 are located on opposite sides of the main gear 6031, the first roller 6034 and the second roller 6037 will rotate in opposite directions, allowing the pencil to move in one direction between the first roller 6034 and the second roller 6037. That is, the pencil can move inward or outward of the pencil sharpener 100 under the drive of the forward / reverse assembly 603.

[0059] In some embodiments, the second interface 1031 is provided with a groove, and the sidewall of the groove is provided with a locking block distributed circumferentially thereon; the outer wall of the fourth interface 6032 is provided with a locking groove distributed circumferentially thereon; the locking block can be selectively inserted into the groove and engaged with it.

[0060] like Figure 1 and Figure 3 As shown, in some embodiments, the pencil sharpener 100 includes a circuit board 303 and a rotary switch 304. The circuit board 303 is equipped with a control circuit, which includes, for example, Figure 11 The motor control circuit controls the rotation direction of the motor 302 via the rotary switch 304, thereby controlling the rotation direction of the pencil holder 10 and the working state of the drive assembly 30, enabling the pencil to move automatically inward or outward from the pencil sharpener 100. In the figure, the dashed box K represents a circuit structure of the rotary switch 304.

[0061] In some embodiments, the motor control circuit can change the connection relationship between the first and second electrodes of the motor 302 and the positive and negative electrodes of the power supply circuit. When the first electrode is electrically connected to the positive electrode and the second electrode is electrically connected to the negative electrode, the motor 302 can rotate in a first direction; when the first electrode is electrically connected to the negative electrode and the second electrode is electrically connected to the positive electrode, the motor 302 can rotate in a second direction; wherein, the rotation directions of the first and second directions are opposite.

[0062] In addition, the pencil sharpener 100 of this application can have a built-in battery to power the control circuit. Alternatively, a power interface, such as a USB interface, can be provided on the pencil sharpener 100, which is electrically connected to the control circuit; an external power source can be connected to the power interface to power the control circuit.

[0063] like Figure 1 As shown, in some embodiments, the side wall of the outer support 20 is provided with a window 203, and the housing 50 is provided with a viewing window 501, allowing the user to observe the pencil's sharpening process through the viewing window 501 and the window 203. Additionally, multiple windows 203 can reduce the weight of the outer support 20.

[0064] The aforementioned blade body 105 and blade holder 10 can be applied to electric or manual pencil sharpeners 100, without specific limitations.

[0065] The above descriptions are merely examples of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A tool body applied to a rotary tool holder, characterized in that, The body includes a first end and a second end. The body includes a blade portion (1051) and a clearance portion (1052). The blade portion (1051) is close to the first end of the body, and the clearance portion (1052) is close to the second end of the body. The body is provided with a planetary gear (1053). The main body is provided with a blade, and the blade is only provided on the side wall of the blade part (1051); the avoidance part (1052) is used to avoid the pencil barrel, and the blade part (1051) is used to sharpen the pencil lead (701).

2. The blade body according to claim 1, characterized in that, The outer diameter of the blade portion (1051) is larger than the outer diameter of the clearance portion (1052).

3. A blade holder for use in a rotary pencil sharpener, the pencil sharpener comprising a base, characterized in that, It includes a frame (101) and a blade (105) as described in claim 1 or 2; The frame (101) has a first end (102) and a second end (103) along the rotation axis, with the first end (102) facing the base (40) and the second end (103) having a through first channel (104) along the rotation axis; the blade (105) is located on the side of the frame (101), with the first end of the blade (105) rotatably connected to the first end (102) and the second end of the blade (105) rotatably connected to the second end (103); Wherein, the vertical distance between the rotation center of the first end of the blade (105) and the rotation axis is less than the vertical distance between the rotation center of the second end of the blade (105) and the rotation axis.

4. The tool holder according to claim 3, characterized in that, The first end (102) is provided with a first connecting seat (1022), the second end (103) is provided with a second connecting seat (1032), the first end of the blade (105) is rotatably connected to the first connecting seat (1022), and the second end of the blade (105) is rotatably connected to the second connecting seat (1032).

5. The tool holder according to claim 3, characterized in that, The first channel (104) has a tapered end (1041) and the tapered end (1041) is located inside the knife holder (10), and the tapered end (1041) is used to limit the insertion depth of the pencil.

6. The tool holder according to any one of claims 3 to 5, characterized in that, An outer support (20) is sleeved on the outside of the tool holder (10), and an inner gear ring (202) is provided on the inner wall of the outer support (20). The inner gear ring (202) meshes with the planetary gear (1053) of the tool body (105). The tool holder (10) can rotate within the outer support (20) around the rotation axis and drive the tool body (105) to rotate on the tool holder (10).

7. A pencil sharpener, characterized in that, Includes a base (40) and a tool holder (10) as described in claim 6; The first end (102) of the tool holder (10) is provided with a first interface (1021), and the base (40) is provided with a rotatable third interface (301). The first interface (1021) and the third interface (301) are connected in cooperation. The outer bracket (20) is relatively stationary on the base (40). The tool holder (10) can be rotated within the outer support (20) around the rotation axis by driving the third interface (301).

8. The pencil sharpener according to claim 7, characterized in that, It also includes a motor (302) that can drive the third interface (301) to rotate on the base (40).

9. The pencil sharpener according to claim 7 or 8, characterized in that, It also includes a housing (50) and a top cover (60), the first end of the housing (50) being connected to the base (40), and the tool holder (10) being disposed inside the housing (50), and the top cover (60) being disposed at the second end of the housing (50); The second end (103) of the tool holder (10) is provided with a second interface (1031); The top cover (60) is provided with a through hole (602), and the top cover (60) is provided with a forward and backward assembly (603). The forward and backward assembly (603) is provided with a fourth interface (6032), and the second interface (1031) is connected to the fourth interface (6032). The blade holder (10) can drive the advance and retraction assembly (603) when it rotates, and the advance and retraction assembly (603) can move the pencil inserted into the through hole (602) toward the inside or outside of the pencil sharpener (100).

10. The pencil sharpener according to claim 9, characterized in that, It also includes a circuit board (303), on which a motor control circuit is provided. The motor control circuit can change the connection relationship between the first electrode and the second electrode of the motor (302) and the positive electrode and the negative electrode of the power supply circuit. When the first electrode is electrically connected to the positive electrode and the second electrode is electrically connected to the negative electrode, the motor (302) can rotate in a first direction; when the first electrode is electrically connected to the negative electrode and the second electrode is electrically connected to the positive electrode, the motor (302) can rotate in a second direction.

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