Pencil clamping device for electric pencil sharpener and electric pencil sharpener

Abstract

The utility model relates to a pencil clamping device (100) for an electric pencil sharpener. The pencil clamping device (100) comprises a top cover (110) and a pencil clamping mechanism (120), wherein the top cover (110) is provided with a circumferential flange, a first pencil inlet hole (111) and three first supporting parts (112), and the pencil clamping mechanism (120) is provided with a pencil clamping disc (121) and a plurality of pencil clamping assemblies (122). The pen clamping disc (121) is provided with a body, a cutting flange (1211) extending in the axial direction, a second pen inlet hole (1212) and three second supporting parts (1213). The multiple pen clamping assemblies (122) are provided with pen clamping shafts (1221), pen clamping wheels (1222) and at least one thrust wheel (1223). The utility model further relates to the electric pencil sharpener (10) with the pencil clamping device (100). The electric pencil sharpener (10) is low in manufacturing cost, can control feeding of pencils, ensures pencil sharpening quality and prevents excessive sharpening consumption.

Description

Technical Field

[0001] The utility model relates to a pencil clamping device for an electric pencil sharpener and an electric pencil sharpener with the pencil clamping device. Background Art

[0002] Traditional pencil sharpeners usually require manual sharpening, which can easily cause the tip of the pencil to break due to uneven force applied during the sharpening process, and can further contaminate fingers. In order to solve these technical problems, more and more fully automatic pencil sharpeners have appeared on the market.

[0003] As a technical solution for an electric pencil sharpener, Chinese utility model patent CN 111169206 B provides an electric pencil sharpener. This electric pencil sharpener is equipped with a first microswitch on the side of the pen feed hole and a second microswitch on the base. A push rod is provided on one side of the hob holder. The movement of the top cover of the electric pencil sharpener triggers the second microswitch by depressing the push rod. When a pencil is inserted into the pen feed hole, a slider, acting as a transmission component, triggers the first microswitch, thereby activating the drive motor. After the motor is activated, the drive shaft rotates synchronously with the pen holder, causing the pen feed mechanism to automatically feed the pencil inserted into the pen feed hole. Simultaneously, the small gear on the planing assembly, in conjunction with the internal gear ring, rotates and drives the hob, thereby planing the pencil as it is inserted. In other words, this fully automatic pencil sharpening device has a complex structure. In addition to the drive motor and the gear mechanism for the cutting drive, it also requires microelectronic components and circuitry to identify the pencil's feeding status. Furthermore, the electric motor used in this electric pencil sharpener is used to both cut and feed the pencil, resulting in excessive power consumption and increased operating costs. Furthermore, without a pencil cutting status recognition sensor, the pencil would be continuously fed axially and cut, leading to pencil wear and tear. With a pencil cutting status recognition sensor, the entire fully automatic pencil sharpener involves more electronic components, circuits, and mechanical structures, increasing its cost. These consumable electronic components are easily damaged by shock and vibration, which can lead to the immediate destruction of the electric pencil sharpener.

[0004] Typically, this type of electric pencil sharpener is also equipped with three sets of clamping wheel assemblies to assist in the axial feeding of the pencil. Another Chinese utility model patent, CN 215474153 U, shows the typical structure of this clamping wheel assembly. The clamping wheel assembly includes at least a chassis and a rotating disk with a helical tooth surface, and a disc-shaped bracket is also constructed to support the clamping wheel assembly. Furthermore, each clamping wheel assembly includes at least a helical gear for engaging with the helical tooth surface of the rotating disk and a clamping wheel with a conical shape. The meshing movement between the helical tooth surface of the rotating disk and the helical gears of the clamping wheel assembly generates an axial force that can gradually move the pencil toward the pencil sharpener. This three-clamping wheel assembly also has the disadvantages of being complex in structure and easily damaged due to the large number of components. Utility Model Content

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the shortcomings of the electric pencil sharpeners described in the above prior art, such as complex structure, high power consumption, excessive electronic components that are easily damaged, and high cost of use, as well as to reduce the defect of excessive pencil consumption caused by the identification of cutting electronic components.

[0006] In order to solve the above technical problems, the utility model aims to provide an electric pencil sharpener that is easy to operate and relatively low in cost. The electric pencil sharpener is equipped with a pencil clamping device with a simpler structure, thereby reducing the manufacturing cost of the electric pencil sharpener, and controlling the feed of the pencil in a more convenient way to ensure the cutting quality of the pencil and effectively preventing excessive consumption of the pencil during the cutting process.

[0007] According to one aspect of the present invention, in a non-limiting embodiment of the present invention, a pen-clamping device for an electric pencil sharpener includes at least: a top cover and a pen-clamping mechanism. The top cover has an axially extending circumferential flange, a first pen-feeding hole, and three first supporting portions, wherein the first pen-feeding hole axially penetrates the top cover surface and the circumferential flange; each first supporting portion has two ribs spaced apart from each other, each rib extending radially toward the center axis of the top cover to the vicinity of the first pen-feeding hole and joined together. The pen-clamping mechanism includes a pen-clamping tray and multiple sets of pen-clamping assemblies; wherein the pen-clamping tray has a body, an axially extending cutting flange, a second pen-feeding hole, and three second supporting portions, wherein the second pen-feeding hole axially penetrates the body and the cutting flange; the second supporting portion is designed to be substantially identical to the corresponding first supporting portion; and multiple sets of pen-clamping assemblies, each of which has a pen-clamping shaft, a cylindrical pen-clamping wheel, and at least one thrust wheel.

[0008] The ribs of the first supporting portion of the top cover and / or the second supporting portion of the pen clamping tray are configured with recesses opposite to each other; the first supporting portion of the top cover and / or the second supporting portion of the pen clamping tray abut against each other, and the pen clamping shafts of each group of pen clamping assemblies are received in the recesses.

[0009] In a non-limiting embodiment of the present invention, the three first supporting portions of the top cover are evenly connected to the inner periphery of the circumferential flange of the top cover; the three second supporting portions of the pen holder tray are evenly connected to the inner periphery of the pen holder tray body.

[0010] In a specific embodiment of the present invention, the two ribs of each first supporting portion of the top cover form an angle of approximately 120 degrees, which points to the central axis of the top cover; and the two ribs of the three second supporting portions of the pen holder tray also form the same angle.

[0011] In a non-limiting embodiment of the present invention, the pencil-clamping shaft comprises a first journal and a second journal having the same diameter, and a third journal located between the first journal and the second journal.

[0012] In a specific embodiment of the present invention, the pencil-clamping shaft has a first journal and a second journal with the same axial size, and a radial size of the third journal is larger than those of the first journal and the second journal.

[0013] In a specific embodiment of the present invention, the axial dimension of the pen clamp wheel exceeds the axial dimension of the third journal of the pen clamp shaft by approximately 0.5 mm.

[0014] According to another aspect of the present invention, in a non-limiting embodiment thereof, an electric pencil sharpener having the aforementioned pencil holder device is provided. The electric pencil sharpener comprises a pencil sharpener mechanism, a transmission mechanism operatively connected to the pencil sharpener mechanism, and a motor operatively connected to the transmission mechanism. The pencil sharpener mechanism comprises a pencil sharpener holder, the pencil sharpener holder having at least a holder flange directed toward the pencil holder tray and a third pen feed hole extending through the holder flange.

[0015] In a non-limiting embodiment of the present invention, the electric pencil sharpener further comprises a pen tip push rod, which is vertically mounted to the bottom of the electric pencil sharpener and has a contact section and a support rod section capable of abutting against a pencil inserted into the electric pencil sharpener.

[0016] In a specific embodiment of the present invention, the contact section of the pen tip rod is made of elastic material.

[0017] In a specific embodiment of the present invention, the second pen feed hole of the pen clamping tray in the pen clamping device for the electric pencil sharpener receives the tool holder flange of the pencil sharpener in the pencil sharpening mechanism, and the first pen feed hole of the top cover in the pen clamping device for the electric pencil sharpener, the pen clamping gaps constructed by each group of pen clamping assemblies, the second pen feed hole of the pen clamping tray, and the third pen feed hole of the pencil sharpener in the pencil sharpening mechanism are substantially coaxial.

[0018] In summary, the present invention overcomes the shortcomings of the prior art and provides a simple, easy-to-manufacture, low-cost, and easy-to-operate pencil sharpener and an electric pencil sharpener having the same. Other features and advantages of the present invention will be apparent to those skilled in the art after reading this application, and will be described in detail below in conjunction with the accompanying drawings.

[0019] For ease of discussion, the pencil clamp device for an electric pencil sharpener and the electric pencil sharpener having the pencil clamp device described in the present application will be discussed with reference to the reference numerals indicated in the accompanying drawings. However, unless otherwise explicitly indicated, the accompanying drawings and detailed description should not be considered to limit the scope of the claims, and the utility model disclosed herein may also be implemented in various variations or improvements as needed. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings herein are incorporated in and constitute a part of this specification, and illustrate embodiments consistent with the present invention. They are merely exemplary and explanatory and are not intended to limit the present invention.

[0021] Figure 1 An exploded perspective view of an electric pencil sharpener according to the present invention is shown, wherein a pencil clamping device according to a non-specific embodiment of the present invention is particularly shown;

[0022] Figure 2 A perspective view of the electric pencil sharpener according to the present invention is shown after removing the housing component, wherein the pencil clamping device, the pencil sharpening mechanism and the transmission mechanism are shown, and in particular, the structure of the pencil clamping device is shown;

[0023] Figure 3 A perspective view showing the separation of the pencil sharpening mechanism and the pencil clamping device of the electric pencil sharpener according to a non-specific embodiment of the present invention from another perspective;

[0024] Figure 4 A perspective view showing a top cover and a pencil clamping device of an electric pencil sharpener according to a non-specific embodiment of the present invention is shown;

[0025] Figure 5 A perspective view of a top cover of an electric pencil sharpener according to a non-specific embodiment of the present invention is shown, wherein the structure of the top cover is specifically shown;

[0026] Figure 6 A perspective view of a pen holder tray in a pen holder device of an electric pencil sharpener according to a non-specific embodiment of the present invention is shown, wherein the structure of the pen holder tray is specifically shown;

[0027] Figure 7 Shown Figure 1The longitudinal cross-sectional view of the electric pencil sharpener is shown, which specifically illustrates a specific connection method of the top cover, the pencil clamping device and the cutting mechanism, as well as the cutting control mode of the pencil tip.

[0028] Reference numerals

[0029] Electric pencil sharpener 10 Electric pencil sharpener with pencil clamp 100

[0030] Top cover 110 First pen inlet 111 First support portion 112 Recess 1121 First positioning portion 113

[0031] First locking portion 114 Pen clamping mechanism 120 Pen clamping plate 121 Circumferential body cutting flange 1211

[0032] Second pen-feeding hole 1212 Second supporting portion 1213 Second positioning portion 1214 Second locking portion 1215

[0033] Pen clamp assembly 122, pen clamp shaft 1221, pen clamp wheel 1222, thrust wheel 1223

[0034] Support 130 Pencil sharpening mechanism 140 Pencil sharpening tool holder 141 Tool holder body 1411 Tool holder flange 1412

[0035] Third pen inlet 1413 Pen tip push rod 142 Contact section 1421 Support rod section 1422 Wedge-shaped member 143 Transmission mechanism 150 Motor 160

[0036] Pencil 200 DETAILED DESCRIPTION

[0037] The present invention is described below in conjunction with the accompanying drawings. It should be understood that the embodiments listed below are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. The accompanying drawings are provided to present multiple embodiments of the present invention, but the drawings do not have to be drawn according to the dimensions of the specific embodiments, and certain features may be enlarged, removed, or partially cut away to better illustrate and explain the disclosure of the present invention. Some components in the accompanying drawings can be repositioned according to actual needs without affecting the technical effects. The phrase "in the accompanying drawings" or similar terms appearing in the specification do not necessarily refer to all drawings or examples.

[0038] Certain directional terms used in the following description of the drawings, such as "inner," "outer," "upper," "lower," "top," "bottom," and other directional terms, are to be understood as having their normal meanings and referring to those directions associated with normal viewing of the drawings. Unless otherwise indicated, the directional terms used in this specification are generally in accordance with conventional directions understood by those skilled in the art.

[0039] The terms "first," "first," "second," and similar terms used in this utility model do not indicate any order, quantity, or importance, but are used to distinguish one component from other components. The expression "substantially" allows for a reasonable range of angular deviation and does not necessarily mean complete consistency.

[0040] Some embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0041] Figure 1 The electric pencil sharpener 10 according to the present invention is shown in a perspective view after the top cover 110 and the outer cover are removed, so as to show the internal structure of the electric pencil sharpener 10. The electric pencil sharpener 100 generally includes a pencil clamping mechanism 120 and a pencil sharpening mechanism 140. Figure 2 The transmission mechanism 150 of the electric pencil sharpener 100 is further shown.

[0042] In a non-limiting embodiment of the present invention, the electric pencil sharpener pen holder device 100 comprises a top cover 110 and a pen holder mechanism 120. The pen holder mechanism 120 at least comprises a pen holder tray 121 and a plurality of pen holder assemblies 122, see Figure 1 and Figure 2 . The pen clamping shaft 1221 of each group of pen clamping assemblies 122 is a stepped shaft. For the convenience of the following description, the two end journals of the pen clamping shaft 1221 are referred to as the first journal and the second journal. The journal located between the first journal and the second journal of the pen clamping shaft 1221 is constructed with a radial dimension larger than the aforementioned first journal and the second journal to support the pen clamping wheel 1222 of the pen clamping assembly 122. For the convenience of the following description, the journal located between the first journal and the second journal is referred to as the third journal. In particular, a thrust shoulder is constructed at the position where the first journal or the second journal is engaged with the third journal to axially abut against the pen clamping wheel 1222. Each group of the pen clamping assemblies 122 is also provided with a thrust wheel 1223 to limit the axial movement of the pen clamping wheel 1222 on the third journal of the pen clamping shaft 1221. Preferably, the pen-clamping shaft 1221 is designed such that its first journal and second journal have the same diameter, so as to facilitate mold design and molding of the pen-clamping shaft 1221 .

[0043] In another non-limiting embodiment of the present invention, the pencil clamp shaft 1221 can also be constructed in an axially symmetrical configuration, that is, the pencil clamp shaft 1221 is constructed with only a first journal, a second journal, and a third journal located between the first two journals, and the first and second journals have the same axial dimensions. This can avoid damage to the thrust shoulder constructed near the end of the pencil clamp shaft 1221 during mold removal, thereby effectively reducing the scrap rate of the pencil clamp shaft 1221 during the manufacturing process and lowering the component manufacturing costs of the electric pencil sharpener 10 and the pencil clamp device 100 for an electric pencil sharpener. Accordingly, for the pen clamp shaft 1221 having only the first, second and third journals, a pair of identical thrust wheels 1223 can be designed, that is, the thrust wheels 1223 are constructed to have the same outer circumferential size and the same inner hole size, and can be placed on the first and second journals of the pen clamp shaft 1221 at the same time and abut against the third journal to form a thrust for the pen clamp wheel 1222 installed on the third journal.

[0044] In particular, according to the above non-limiting embodiment of the present invention, the pen-clamping wheel 1222 is configured to have an axial length greater than the third journal of the pen-clamping shaft 1221. Specifically, the axial length of the pen-clamping wheel 1222 exceeds the axial length of the third journal of the pen-clamping shaft 1221 by approximately 0.5 mm, so that the thrust wheel 1223 can axially compress the pen-clamping wheel 1222, thereby securing the pen-clamping wheel 1222 to the third journal of the pen-clamping shaft 1221.

[0045] Preferably, the clamping wheel 1222 is generally cylindrical and made of an elastic material. More preferably, the clamping wheel 1222 is a cylindrical roller made of rubber. It is understood that when the clamping wheel 1222 is axially squeezed by the thrust wheel 1223, it will undergo a certain radial deformation, thereby exerting a radial squeezing force on the pencil 200.

[0046] In a specific embodiment of the present invention, three groups of the pencil clamping assemblies 122 are provided to form a pencil clamping gap, so that the pencil 200 can be stably clamped between the three groups of the pencil clamping assemblies 122 .

[0047] In view of this, the pen clamp assembly 122 according to the present invention has a simpler structure than the pen clamp assembly provided in the prior art, and the various components of the pen clamp assembly 122 have better interchangeability through standardized design, which is beneficial to the cost control of the manufacturer.

[0048] In a non-limiting embodiment of the present invention, the top cover 110 is generally symmetrical along its central axis, and has a generally hollow circumferential flange on its inner surface facing the pencil clamp assembly 122. The outer circumference of the circumferential flange is significantly smaller than the inner circumference of the top cover 110. With the help of the hollow circumferential flange, the top cover 110 of the electric pencil sharpener 100 and the pencil clamp assembly 122 can be tightly connected. For details, see Figure 4 、 Figure 5 and Figure 7 The top cover 110 is provided with a central through hole that passes through the top cover 110 and the circumferential flange. The central through hole is also referred to as the first pen feed hole 111. The pencil 200 can be guided into the electric pencil sharpener 10 with the help of the first pen feed hole 111. Furthermore, a plurality of ribs are constructed on the inner circumferential surface of the circumferential flange. The ribs are also referred to as the first supporting portions 112. The number of the first supporting portions 112 is consistent with the number of the pencil clamping assemblies 122, so that each first supporting portion 112 can abut against its corresponding pencil clamping assembly 122.

[0049] In a non-limiting embodiment of the present invention, each first supporting portion 112 in the circumferential flange of the top cover 110 is respectively constructed with two ribs spaced apart from each other, and each rib extends from the inner peripheral surface of the circumferential flange of the top cover 110, and extends at an angle along the radial direction of the top cover 110 toward the central axis of the top cover to the vicinity of the first pen feed hole 111, thereby forming a V-shaped configuration. In particular, the two ribs of each first supporting portion 112 are engaged with each other at a position close to the first pen feed hole 111, and form a smooth transition surface to facilitate demolding, and can effectively reduce stress concentration and deformation of the position during demolding, so as to improve the yield rate. Preferably, each first supporting portion 112 is constructed to have the same shape and size, and is evenly engaged with the inner periphery of the circumferential flange of the top cover 110, so as to simplify the design and manufacture of the top cover 110. More preferably, three first supporting portions 112 are constructed in the circumferential flange of the top cover 110 . Each first supporting portion 112 is substantially V-shaped with an angle of about 120 degrees and is evenly distributed on the inner side of the circumferential flange of the top cover 110 .

[0050] In a specific embodiment of the present invention, each of the two ribs of the first support portion 112 further comprises a recess 1121. Each recess 1121 is directed toward the first and second journals of the pen-clamping shaft 1221 and has substantially the same inner circumference as the first and second journals of the pen-clamping shaft 1221. This recess 1121 receives the pen-clamping shaft 1221, particularly the first and second journals of the pen-clamping shaft 1221, to form a clearance fit with the first and second journals of the pen-clamping shaft 1221. Preferably, the recesses 1121 on each rib of the first support portion 112 are also symmetrical to facilitate molding.

[0051] In a specific embodiment of the present invention, the circumferential flange of the top cover 110 is further configured with a first positioning portion 113 and a first locking portion 114 on its outer circumferential surface for positioning and clamping the top cover 110 and the pen clamping mechanism 120, which will be further described below.

[0052] In a non-limiting embodiment of the present invention, the pencil holder 121 has a circumferential body and a substantially hollow cutting flange 1211 extending axially from the body, the cutting flange 1211 pointing toward the cutting portion of the electric pencil sharpener 10, see Figure 2 、 Figure 3 and Figure 6 . In particular, the cutting flange 1211 of the pen holder tray 121 is radially symmetrical along the central axis of the body. The circumferential body of the pen holder tray 121 is constructed with a plurality of ribs on the side pointing to the top cover 110. The ribs are also called second supporting parts 1213, which are respectively constructed with two ribs, each of which extends from the inner circumferential surface of the body of the pen holder tray 131 and extends at an angle along the radial direction of the body of the pen holder tray 121 toward the central axis of the pen holder tray 121 to the vicinity of the second pen feed hole 1212 of the pen holder tray 121, thereby forming a V-shaped configuration. In particular, the two ribs of each second supporting part 1213 are engaged with each other at a position close to the second pen feed hole 1212, and form a smooth transition surface to facilitate demolding, and can effectively reduce stress concentration and deformation of this position during demolding, so as to improve the yield rate. Preferably, each of the second supporting portions 1213 is configured to have the same shape and size, and is evenly distributed and engaged with the inner circumference of the body of the pen-holding tray 121 .

[0053] In a specific embodiment of the present invention, the number of the second supporting portions 1213 located on the main body of the pen holder tray 121 is the same as the number of the first supporting portions 112 of the top cover 110, and they have the same V-shaped configuration and angled arrangement, and are particularly constructed with the same thickness. As a result, each second supporting portion 1213 of the pen holder tray 121 abuts against its corresponding first supporting portion 112 of the top cover 110, and with the help of the recess 1121 located on the first supporting portion 112 of the top cover 110, each pen holder shaft 1221 is accommodated, and at the same time, a space for accommodating and moving the pen holder wheels 1222 of each pen holder assembly 122 is constructed. For details, please refer to the attached Figure 7 Optionally, the second support portion 1213 of the pen holder tray 121 has a symmetrical recess like the first support portion 112 of the top cover 110 to provide a rotation space for the pen holder shaft 1221 of the pen holder assembly 122. However, preferably, the second support portion 1213 of the pen holder tray 121 is configured to have only a smooth surface on the side facing the top cover 110, i.e., it does not have a symmetrical recess like the first support portion 112 of the top cover 110, thereby simplifying the installation of each pen holder assembly 122 between the pen holder tray 121 and the top cover 110. In other words, as long as the first and second journals of the pen-clamping shaft 1221 of each pen-clamping assembly 122 fall within the symmetrically arranged recesses 1121 in the first support portion 112 of the top cover 110, each pen-clamping assembly 122 will automatically be centered about the central axis of the pen-clamping tray 121 and the top cover 110, and the first support portion 112 of the top cover 110 and each second support portion 1213 of the pen-clamping tray 121 can be easily docked, thereby enclosing the pen-clamping wheel 1222 between the top cover 110 and the pen-clamping tray 121. This installation method is particularly simple and convenient to operate, and does not require high technical skills from the installer.

[0054] Furthermore, the outer periphery of the main body of the pen holder tray 121 is also configured with a second positioning portion 1214 and a second locking portion 1215. These second positioning portion 1214 and second locking portion 1215 correspond to the first positioning portion 113 and first locking portion 114 of the top cover 110. Specifically, the second positioning portion 1214 and second locking portion 1215 of the pen holder tray 121 and the first positioning portion 113 and first locking portion 114 of the top cover 110 are arranged symmetrically along the outer periphery of the pen holder tray 121 and the outer periphery of the top cover 110, respectively. Preferably, the pen holder tray 121 has a pair of second positioning portions 1214 and a pair of second locking portions 1215, and the second positioning portions 1214 and second locking portions 1215 are evenly distributed along the outer periphery of the pen holder tray 121. Similarly, the first positioning portion 113 and the first locking portion 114 of the top cover 110 are also arranged in the same manner.

[0055] In a non-limiting embodiment of the present invention, the pencil sharpening mechanism 140 generally includes a pencil sharpening tool holder 141. The pencil sharpening tool holder 141 includes at least a tool holder body 1411 and a tool holder flange 1412. The tool holder flange 1412 extends axially from the tool holder body 1411 toward the pencil holder tray 121 and sequentially enters the cutting flange 1211 axially penetrating the pencil holder tray 121 and the second pen inlet hole 1212 of the main body of the pencil holder tray 121, thereby forming a clearance fit between the tool holder flange 1412 and the pencil holder tray 121. Figure 7 The cutting flange 1211 of the pencil sharpener holder 141 is further provided with a third pen feed hole 1413 , whereby the pencil 200 can enter the third pen feed hole 1413 of the pencil sharpener holder 141 through the first pen feed hole 111 of the top cover 110 and can further contact the pencil sharpener.

[0056] To detect the cutting status of pencil 200, a perforation is constructed at the bottom of the pencil sharpener 141 to accommodate a tip push rod 142, which is arranged axially along the pencil sharpening mechanism 140. The tip push rod 142 is specifically constructed with a contact section 1421 and a support rod section 1422. The contact section 1421 is mounted to the top of the support rod section 1422, pointing toward the tip of pencil 200. During the cutting process, the contact section 1421 of the tip push rod 142 abuts the tip of pencil 200, while the support rod section 1422 moves axially opposite the tip of pencil 200 to prevent the tip of pencil 200 from breaking. In a specific embodiment of the present invention, the tip rod 142 is provided with a wedge-shaped member 143 at the end away from the tip of the pencil 200 to accommodate slight movement of the support section 1422 of the tip rod 142. Those skilled in the art may also consider providing an elastic member, such as relatively inexpensive rubber, at the end of the support section 1422 of the tip rod 142 away from the tip of the pencil 200 to accommodate slight movement of the support section 1422 of the tip rod 142.

[0057] In a non-limiting embodiment of the present invention, the pencil sharpener 141 of the pencil sharpening mechanism 140 is usually connected to the motor 160 of the electric pencil sharpener 10 through a transmission mechanism 150. Figure 2 and Figure 7 The transmission mechanism 150 is typically configured as a multi-stage gear drive to stably transmit the power of the motor 160 to the sharpener 141 of the pencil sharpener mechanism 140. Since similar transmission mechanisms for electric pencil sharpeners are already provided in the prior art, they will not be described further herein. In the present invention, the sharpener 141 of the pencil sharpener mechanism 140 is specifically designed to rotate about the pencil 200. In other words, the pencil 200 does not rotate about its own longitudinal axis. This cutting method is significantly different from the prior art cutting method in which the pencil is rotated while the sharpener mechanism 140 rotates.

[0058] During installation, the installer can first place the thrust wheel 1223 on the second journal of the pen clamp shaft 1221. If the pen clamp shaft 1221 has a thrust shoulder, one end face of the pen clamp wheel 1222 can be placed against the thrust shoulder, and the thrust wheel 1223 can be installed on the other end face of the pen clamp wheel 1222. If the pen clamp shaft 1221 does not have a thrust shoulder, the thrust wheels 1223 can be installed on both end faces of the pen clamp wheel 1222, thereby completing the installation of the pen clamp assembly 122. Meanwhile, the tool holder flange 1412 of the sharpening tool holder 141 of the sharpening mechanism 140 can be passed through the second pen feed hole 1212 of the pen clamp tray 121. Next, each set of pen clamp assemblies 122 can be placed on the end face of the circumferential body of the pen clamp tray 121, and the top cover 110 can be snapped onto the end face of the circumferential body of the pen clamp tray 121. Thus, the recesses 1121 arranged in pairs on each first support portion 112 of the top cover 110 sequentially engage with the first and second journals of each pencil clamping shaft 1221, providing space for the first and second journals of each pencil clamping shaft 1221 to rotate freely. After the pencil clamping mechanism 120 and the top cover 110 are integrated, they can be placed vertically on the support 120 of the electric pencil sharpener 10, and the assembled transmission mechanism 150 is installed in turn, and the pen tip push rod 142 arranged at the central axis of the transmission mechanism 150 is partially extended into the bottom of the pencil sharpener holder 141. Then, the chassis of the electric pencil sharpener 10 is installed, and the wedge-shaped member 143, the motor 160, the battery and other components are arranged on the chassis, thereby completing the overall assembly of the electric pencil sharpener 10. It is worth noting that this installation method is not the only installation method of the electric pencil sharpener 10, and those skilled in the art can also complete the assembly of the electric pencil sharpener 10 in other ways.

[0059] During use, the user of the electric pencil sharpener 10 sequentially inserts a pencil 200 into the first pen feed hole 111 of the top cover 110. The tip and shaft of the pencil 200 then pass through the gaps between the clamping assemblies 122 and radially press against the cylindrical clamping wheels 1222 of each clamping assembly 122, entering the third pen feed hole 1413 disposed within the blade flange 1412 of the pencil sharpener holder 141. As previously described, the blade flange 1412 of the pencil sharpener holder 141 is inserted at its outer periphery into the second pen feed hole 1212 in the cutting flange 1211 of the pencil clamping plate 121. To begin cutting, the user activates the motor switch, causing the sharpening mechanism 140 of the electric pencil sharpener 10 to begin rotating about its central axis. Specifically, the pencil sharpener holder 141 drives the sharpener to rotate around the tip of the pencil 200. Unlike conventional fully automatic electric pencil sharpeners, the axial feed motion of the pencil 200 is not provided by the motor 160, but rather by the user's finger gently pressing against the end of the pencil 200. Therefore, when the sharpened tip of the pencil 200, i.e., the sharpened lead, abuts the elastic contact section 1421 of the tip push rod 142, the user's finger senses pressure in the opposite direction of the pencil's axis, thereby stopping the feed of the pencil 200 and allowing the pencil 200 to be withdrawn from the third pen feed hole 1413 within the tool holder flange 1412 of the pencil sharpener 141, the gap between the cylindrical pen gripping wheels 1222 of each pen gripping assembly 122, and the first pen feed hole 111 of the top cover 110. This completes the cutting of the pencil 200 and ensures the quality of the pencil lead.

[0060] In summary, the structure of this electric pencil sharpener reduces the number of microelectronic components and microelectronic circuits used to sense cutting compared to the electric pencil sharpeners described in the prior art, effectively reducing the manufacturing cost of the electric pencil sharpener. Furthermore, the motor associated with the electric pencil sharpener is only used to perform cutting movements around the periphery of the pencil, effectively reducing power consumption and reducing the user's cost of use. Furthermore, through the pushing force and touch of the user's fingers, the pencil's feeding movement is manually stopped when the pencil has been sharpened and abuts against the contact section of the pencil tip rod, thereby avoiding excessive consumption of the pencil caused by the continuous operation of the motor, reducing the user's cost of use, and extending the service life of the electric pencil sharpener. On the other hand, the electric pencil sharpener according to the utility model also provides a simpler pen clamping device compared to the prior art, and the pen clamping device is also more suitable for manufacturing and installation.

[0061] Unless expressly excluded or otherwise limited, each document cited herein, including any cross-referenced or related patent or patent application and any patent application or patent to which this application claims priority or the benefit of which is hereby incorporated by reference in its entirety. The citation of any document is not an admission that it is prior art to any of the disclosed or claimed inventions herein, or that it, by itself or in combination with any one or more references, proposes, suggests, or discloses any such invention. In addition, when any meaning or definition of a term in this invention conflicts with any meaning or definition of the same term in a document incorporated by reference, the meaning or definition assigned to that term in this invention shall prevail.

[0062] Although specific embodiments of the present invention have been illustrated and described, it will be apparent to those skilled in the art that many other changes and modifications may be made without departing from the spirit and scope of the present invention. Therefore, it is intended that all such changes and modifications within the scope of the present invention be encompassed in the appended claims.

Claims

1. A pencil clamping device (100) for an electric pencil sharpener, characterized in that: At least: A top cover (110) having an axially extending circumferential flange, a first pen-feeding hole (111), and three first supporting portions (112), wherein the first pen-feeding hole (111) axially penetrates the cover surface of the top cover and the circumferential flange; each first supporting portion (112) has two ribs spaced apart from each other, each rib extending radially toward the central axis of the top cover (110) to the vicinity of the first pen-feeding hole (111) and being joined together; A pen clamping mechanism (120) comprises a pen clamping plate (121) and a plurality of pen clamping assemblies (122); wherein, - The pen holder plate (121) comprises a body, an axially extending cutting flange (1211), a second pen feed hole (1212), and three second supporting portions (1213), wherein the second pen feed hole (1212) axially penetrates the body and the cutting flange (1211); the second supporting portion (1213) is designed to be substantially the same as the corresponding first supporting portion (112); - a plurality of pen-clamping assemblies (122), each of which comprises a pen-clamping shaft (1221), a cylindrical pen-clamping wheel (1222) and at least one thrust wheel (1223); The first supporting portion (112) of the top cover (110) and / or the second supporting portion (1213) of the pen clamping plate (121) are formed with recesses facing each other on the ribs; the first supporting portion (112) of the top cover (110) and / or the second supporting portion (1213) of the pen clamping plate (121) abut against each other, and the pen clamping shaft (1221) of each group of pen clamping assemblies (122) is received in the recesses.

2. The pencil clamp device (100) for an electric pencil sharpener according to claim 1, characterized in that: The three first supporting portions (112) of the top cover (110) are evenly connected to the inner periphery of the circumferential flange of the top cover (110); and the three second supporting portions (1213) of the pen holder tray (121) are evenly connected to the inner periphery of the pen holder tray (121) body.

3. The pencil clamp device (100) for an electric pencil sharpener according to claim 2, characterized in that: The two ribs of each first supporting portion (112) of the top cover (110) form an angle of approximately 120 degrees, which points to the central axis of the top cover (110); and the two ribs of the three second supporting portions (1213) of the pen holder tray (121) also form the same angle.

4. The pencil clamp device (100) for an electric pencil sharpener according to claim 1, characterized in that: The pen-clamping shaft (1221) comprises a first journal and a second journal with the same diameter, and a third journal located between the first journal and the second journal.

5. The pencil clamp device (100) for an electric pencil sharpener according to claim 4, characterized in that: The pen-clamping shaft (1221) comprises a first journal and a second journal having the same axial dimensions, and the radial dimension of the third journal is greater than the radial dimensions of the first journal and the second journal.

6. The pencil clamp device (100) for an electric pencil sharpener according to claim 5, characterized in that: The axial dimension of the pen clamp wheel (1222) exceeds the axial dimension of the third journal of the pen clamp shaft by approximately 0.5 mm.

7. An electric pencil sharpener (10), characterized in that: include: A pen-holding device (100), wherein the pen-holding device (100) is the pen-holding device (100) for an electric pencil sharpener according to any one of claims 1 to 6; A pencil sharpening mechanism (140) comprising a pencil sharpening tool holder (141), wherein the pencil sharpening tool holder (141) at least comprises a tool holder flange (1412) pointing toward the pen holder plate (121) and a third pen feed hole (1413) penetrating the tool holder flange (1412); a transmission mechanism (150) operatively connected to the pencil sharpening mechanism; and A motor (160) is operatively connected to the transmission mechanism (150).

8. The electric pencil sharpener (10) according to claim 7, characterized in that The utility model also comprises a pen tip push rod (142), which is vertically mounted to the bottom of the electric pencil sharpener (10) and has a contact section (1421) and a support rod section (1422) capable of abutting against a pencil inserted into the electric pencil sharpener.

9. The electric pencil sharpener (10) according to claim 8, characterized in that The contact section (1421) of the pen tip push rod (142) is made of elastic material.

10. The electric pencil sharpener (10) according to claim 7, characterized in that The second pen feed hole (1212) of the pen holder plate (121) in the pen holder device (100) for the electric pencil sharpener receives the tool holder flange (1412) of the pencil sharpener tool holder (141) in the pencil sharpening mechanism (140); the first pen feed hole (111) of the top cover (110) in the pen holder device (100) for the electric pencil sharpener, the pen clamping gaps formed by each group of pen clamping assemblies (122), the second pen feed hole (1212) of the pen holder plate (121), and the third pen feed hole (1413) of the pencil sharpener tool holder (141) in the pencil sharpening mechanism (140) are substantially coaxial.

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