Lead feed mechanism for automatic pencil sharpener

Abstract

The utility model provides automatic pencil sharpener's pencil feed mechanism belongs to pencil sharpener technical field. It has solved automatic pencil sharpener overall assembly inconvenient problem. The pencil feed mechanism of this automatic pencil sharpener includes pencil feed box and the pencil feed assembly of setting in pencil feed box, and the pencil feed box includes the box body of top opening and the box cover of being fixed in the top of box body, is equipped with through -hole on the box cover, and the box cover is the plastic piece, is equipped with a pair of the clamping piece that is all board -shaped in through -hole, two clamping pieces are opposite and set up in horizontal direction, and the elastic part that is strip -shaped is integrally connected between the hole wall of clamping piece and through -hole, and two clamping pieces are close to each other under the elastic force of the elastic part of being connected respectively and form the guide hole between the inner end of two clamping pieces, and the pencil feed assembly is located the right below of guide hole. It has greatly improved the assembly convenience of entire automatic pencil sharpener and has other advantages.

Description

Technical Field

[0001] This utility model belongs to the field of pencil sharpener technology, and relates to the pencil feeding mechanism of an automatic pencil sharpener. Background Technology

[0002] Automatic pencil sharpeners can automatically sharpen pencils, greatly improving efficiency compared to traditional hand-cranked pencil sharpeners. Current automatic pencil sharpeners generally consist of a housing, a mechanism housing a bracket, a pencil holder, a sharpening assembly, and a motor that controls the sharpening assembly. Furthermore, to enhance ease of use, more and more automatic pencil sharpeners are equipped with an automatic feeding function to automatically feed and withdraw the pencil.

[0003] For example, the automatic pencil sharpener disclosed in patent application number 202321610996.9 includes a cover with a pen-holding hole through the top, a pencil-feeding box located inside the cover and with a pen-feeding hole through the top, and two pen-feeding shaft assemblies connected in parallel inside the pencil-feeding box. A pen-feeding channel is formed between the two pen-feeding shaft assemblies. An elastic guide plate is fixedly connected to the inside of the cover. The guide plate has a guide hole in the vertical direction, which is located directly below the pen-holding hole. The guide plate has several deformable notches evenly arranged around the guide hole, all of which are connected to the guide hole. A clamping flap is formed between two adjacent deformable notches on the guide plate. A guide plate is fixedly connected to the inside of the cover. The guide plate has a guide hole located directly above the pen feeding channel in the vertical direction. The guide hole can keep the pencil from tilting during automatic pen feeding or sharpening. At the same time, since the guide plate is elastic, several deformable notches are evenly arranged around the guide hole, which are connected to the guide hole. The guide plate forms a clamping petal between two adjacent deformable notches. In this way, the different degrees of deformation at each clamping petal can be used to adapt to the clamping of pencils of different thicknesses.

[0004] However, the guide plate is a separate component. To secure it, a square protrusion and several mounting posts inside the protrusion are required on the inner top wall of the cover. During assembly, the guide plate must first be placed inside the protrusion, ensuring each mounting post passes through its corresponding hole. Then, a pressure plate is placed against the lower side of the protrusion and fastened to the mounting posts to position the pressure plate on the protrusion. This way, the pressure plate secures the guide plate to the cover. Clearly, this structure is complex, and the separate installation and securing of the guide plate makes the entire automatic pencil sharpener inconvenient to assemble. Utility Model Content

[0005] The purpose of this invention is to address the aforementioned problems in the existing technology by proposing a pen-feeding mechanism for an automatic pen sharpener, thus solving the problem of inconvenient overall assembly of the automatic pen sharpener.

[0006] The objective of this utility model can be achieved through the following technical solutions:

[0007] The automatic pencil sharpener's feeding mechanism includes a pencil feeding box and a pencil feeding assembly disposed within the pencil feeding box. The pencil feeding box includes a box body with an open top and a box cover fixed to the top of the box body. The box cover has a through hole. The box cover is made of plastic. A pair of plate-shaped clamping members are disposed within the through hole. The two clamping members are arranged opposite each other in the horizontal direction. A strip-shaped elastic part is integrally connected between the clamping members and the wall of the through hole. Under the elastic force of the elastic parts connected to them, the two clamping members move closer to each other and form a guide hole between the inner ends of the two clamping members. The pencil feeding assembly is located directly below the guide hole.

[0008] When in use, insert the pencil into the automatic pencil sharpener. The pencil passes through the guide hole formed between the two clamping parts and reaches the pencil feeding assembly. The outer diameter of the pencil is larger than the diameter of the guide hole. When the pencil passes through the guide hole, the side wall of the pencil will squeeze the two clamping parts to the sides. At this time, the elastic part will be compressed and in turn apply elastic force to the pencil through the clamping parts to form a clamping force. This clamping force can ensure that the pencil will not be tilted during the pencil feeding assembly.

[0009] The automatic pencil sharpener's feeding mechanism features two clamping components within the through-hole of the pencil case lid. A strip-shaped elastic section is integrally connected between the clamping components and the wall of the through-hole. Under the elastic force of their respective connected elastic sections, the two clamping components move closer together, forming a guide hole between their inner ends for the pencil to pass through. The integral connection of the elastic section between the through-hole wall and the clamping components means that the clamping components, elastic section, and lid are a single, integrated structure. Since the lid is made of plastic, the clamping components and elastic section are integrally formed on it during manufacturing. This allows the lid itself to function as a pencil guide, eliminating the need for a dedicated guide plate or a corresponding mounting structure on the machine. This ensures the stability of automatic pencil feeding and retraction while significantly improving the ease of assembly for the entire automatic pencil sharpener.

[0010] In the above-mentioned automatic pencil sharpener's feeding mechanism, the through hole has two protruding tabs on its wall. The two tabs are arranged opposite each other, and two clamping members are located between the two tabs. The opposite direction of the two clamping members is perpendicular to the opposite direction of the two tabs. The outer end of the clamping member extends out of the tab along the opposite direction of the two clamping members. Each clamping member is connected to two elastic parts, and the two elastic parts are respectively connected between the outer end of the clamping member and the two tabs.

[0011] With the above settings, the elastic part naturally generates a pulling force on the connected clamping member under normal conditions, bringing it closer to the central axis of the through hole. This ensures that after the elastic part is compressed, it can, in turn, provide a stable clamping force to the pencil through the clamping member, ensuring that the pencil will not tilt during the feeding process.

[0012] In the aforementioned automatic pencil sharpener's feeding mechanism, the elastic part is bent into a corrugated shape along the opposite direction of the two clamping members.

[0013] The elastic part is bent in a corrugated shape along the opposite direction of the two clamping parts. This state means that the elastic part is in a contracted state under normal conditions, which causes the two clamping parts to come close together to form a guide hole. When the pencil passes through the guide hole and compresses the two clamping parts, the natural extension of the elastic part can separate the two clamping parts. The elastic force generated by the elastic part wanting to return to its original shape can then be used to clamp the pencil.

[0014] In the aforementioned automatic pencil sharpener's feeding mechanism, the connection between the elastic part and the outer end of the clamping member is smoothly transitioned.

[0015] The connection between the elastic part and the outer end of the clamping member is smoothly transitioned, which reduces stress concentration at this point and ensures that the connection between the elastic part and the outer end of the clamping member is not prone to breakage during frequent topographic changes of the elastic part.

[0016] In the aforementioned automatic pencil sharpener's feeding mechanism, both clamping members have downwardly inclined guide surfaces on their inner upper ends.

[0017] The hole for inserting a pencil in an automatic pencil sharpener is larger than the outer diameter of the pencil, which means that the pencil is not necessarily inserted straight into the sharpener. To address this, downward-sloping guide surfaces are provided on the upper inner ends of the two clamping parts. The presence of these two guide surfaces makes the upper end of the guide hole flared, allowing the pencil to pass smoothly through the guide hole even if it is not inserted straight into the automatic pencil sharpener.

[0018] In the pencil feeding mechanism of the aforementioned automatic pencil sharpener, the inner ends of both clamping members have downward folding portions.

[0019] The clamping parts are plate-shaped and not too thick. Therefore, downward folding parts are provided at the inner ends of both clamping parts. The folding parts can increase the contact area between the clamping parts and the pencil, further ensuring that the pencil will not be crooked during the feeding process.

[0020] Compared with existing technologies, the pencil feeding mechanism of this automatic pencil sharpener features two clamping members inside the through-hole of the pencil box lid. A strip-shaped elastic part is integrally connected between the clamping members and the wall of the through-hole. Under the elastic force of their respective connected elastic parts, the two clamping members move closer together, forming a guide hole between their inner ends for the pencil to pass through. The integral connection of the elastic part between the through-hole wall and the clamping members means that the clamping members, elastic part, and lid are a single integrated structure. Since the lid is made of plastic, the clamping members and elastic part are integrally formed on it during manufacturing. This allows the lid itself to function as a pencil guide, eliminating the need for a dedicated guide plate or a corresponding mounting structure on the machine. This ensures the stability of automatic pencil feeding and retraction while significantly improving the assembly convenience of the entire automatic pencil sharpener. Attached Figure Description

[0021] Figure 1 This is a cross-sectional view of an automatic pencil sharpener.

[0022] Figure 2 This is an exploded view of the pen holder.

[0023] Figure 3 This is a 3D schematic diagram of the pen feeding component.

[0024] In the diagram, 1. Pen feeding box; 1a. Box body; 1b. Box lid; 1b1. Through hole; 1b2. Protrusion; 2. Pen feeding assembly; 3. Clamping component; 3a. Guide surface; 3b. Folding part; 4. Guide hole; 5. Elastic part; 6. Mounting bracket; 7. Drive plate; 8. Pen feeding shaft; 9. Transmission gear; 10. Rubber wheel; 11. Housing; 12. Pen holder; 13. Planing assembly. Detailed Implementation

[0025] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0026] like Figure 1 , Figure 2 and Figure 3As shown, the automatic pencil sharpener's feeding mechanism includes a pencil feeding box 1 and a pencil feeding assembly 2 disposed within the pencil feeding box 1. The pencil feeding box 1 includes a box body 1a with a top opening and a box cover 1b fixed to the top of the box body 1a. The box cover 1b has a through hole 1b1. A mounting bracket 6 is fixed inside the box body 1a. The pencil feeding assembly 2 includes a drive disk 7 rotatably disposed on the mounting bracket 6 and two parallel pencil feeding shafts 8 that can both rotate on the mounting bracket 6. The drive disk 7 is horizontally disposed, and the two pencil feeding shafts 8 are located above the drive disk 7. Several drive teeth are provided circumferentially on the upper side of the drive disk 7. A transmission gear 9 is fixed on each of the two pencil feeding shafts 8. The two transmission gears 9 are located at opposite ends of the two pencil feeding shafts 8 and are meshed with the drive teeth. The automatic pencil sharpener includes a housing 11 with a pencil inlet hole at the top, a pencil holder 12 and a drive motor both housed within the housing 11. The drive motor drives the pencil holder 12 to rotate. A sharpening assembly 13 is mounted on the pencil holder 12. A housing 1a is fixedly connected inside the housing 11. The drive disc 7 is T-shaped, with its lower end fitted onto the top of the pencil holder 12 and both circumferentially fixed. Rubber wheels 10 are fixed to both pencil feed shafts 8, forming a pencil feed channel between them. The drive disc 7 has a pencil through hole in the vertical direction, and the pencil feed channel is located above the pencil through hole.

[0027] Furthermore, such as Figure 1 and Figure 2 As shown, the lid 1b is made of plastic. A pair of plate-shaped clamping members 3 are provided inside the through hole 1b1. The two clamping members 3 are arranged opposite each other in the horizontal direction. A strip-shaped elastic part 5 is integrally connected between the clamping member 3 and the wall of the through hole 1b1. Under the elastic force of their respective connected elastic parts 5, the two clamping members 3 move closer to each other, forming a guide hole 4 between their inner ends. The pen feeding assembly 2 is located directly below the guide hole 4. The upper side of the inner end of each clamping member 3 has a downwardly inclined guide surface 3a, and the inner end of each clamping member 3 has a downwardly folded part 3b. Specifically, the through hole 1b1 has two protruding tabs 1b2 protruding from its wall. The two tabs 1b2 are arranged opposite each other and are rectangular in shape along their opposite direction. Two clamping members 3 are located between the two tabs 1b2, and the opposite direction of the two clamping members 3 is perpendicular to the opposite direction of the two tabs 1b2. The outer ends of the clamping members 3 extend beyond the tabs 1b2 along the opposite direction of the two clamping members 3. Each clamping member 3 is connected to two elastic parts 5, which are respectively connected between the outer end of the clamping member 3 and the two tabs 1b2. The elastic parts 5 are bent into a corrugated shape along the opposite direction of the two clamping members 3, and the connection between the elastic parts 5 and the outer ends of the clamping members 3 is smoothly transitioned.

[0028] In use, the pencil is inserted through the inlet hole at the top of the housing 11. The pencil passes through the guide hole 4 formed between the two clamping members 3 and into the feeding channel between the two feeding shafts 8. The outer diameter of the pencil is larger than the diameter of the guide hole 4. As the pencil passes through the guide hole 4, the side wall of the pencil will press the two clamping members 3 to both sides. At this time, the elastic part 5 will be compressed and apply elastic force to the pencil through the clamping members 3 to form a clamping force. When the pencil enters the feeding channel, the pencil contacts the rubber rollers 10 on the two feeding shafts 8. As the two feeding shafts 8 rotate, the friction between the rubber rollers 10 and the pencil will continuously feed the pencil downward into the planing assembly 13 of the mechanism, realizing automatic pencil feeding. After planing, the two feeding shafts 8 rotate in opposite directions, and the friction between the rubber rollers 10 and the pencil will also continuously feed the planed pencil upward, realizing automatic pencil retraction. During the automatic pen feeding and automatic pen retraction processes, the two clamping parts 3 are always pressed against the side of the pencil under the elastic force of the elastic part 5, thus ensuring that the pencil will never tilt.

[0029] The automatic pencil sharpener's feeding mechanism has two clamping members 3 installed inside the through hole 1b1 of the pencil box 1's cover 1b. The clamping members 3 are integrally connected to the wall of the through hole 1b1 with a strip-shaped elastic part 5. Under the elastic force of the elastic part 5 connected to each other, the two clamping members 3 approach each other and form a guide hole 4 between the inner ends of the two clamping members 3 for the pencil to pass through. The elastic part 5 is integrally connected between the wall of the through hole 1b1 and the clamping member 3, which means that the clamping member 3, the elastic part 5 and the cover 1b are a one-piece structure. The cover 1b is a plastic part, which means that the clamping member 3 and the elastic part 5 are integrally formed on it when the cover 1b is manufactured. This makes the cover 1b itself have the function of clamping and guiding the pencil, so there is no need to set up a guide plate separately, nor is there a corresponding installation structure on the machine to install and fix the guide plate. While ensuring the stability of automatic pencil feeding or automatic pencil retraction, it also greatly improves the assembly convenience of the entire automatic pencil sharpener.

[0030] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. An automatic pencil sharpener's feeding mechanism, comprising a pencil feeding box (1) and a pencil feeding assembly (2) disposed within the pencil feeding box (1), wherein the pencil feeding box (1) comprises a box body (1a) with a top opening and a box cover (1b) fixed to the top of the box body (1a), the box cover (1b) having a through hole (1b1), characterized in that, The box cover (1b) is made of plastic. A pair of plate-shaped clamping members (3) are provided in the through hole (1b1). The two clamping members (3) are arranged opposite each other in the horizontal direction. A strip-shaped elastic part (5) is integrally connected between the clamping member (3) and the hole wall of the through hole (1b1). The two clamping members (3) approach each other under the elastic force of the elastic part (5) to which they are connected and form a guide hole (4) between the inner ends of the two clamping members (3). The pen feeding assembly (2) is located directly below the guide hole (4).

2. The pencil feeding mechanism of the automatic pencil sharpener according to claim 1, characterized in that, The through hole (1b1) has two protruding tabs (1b2) on its wall. The two tabs (1b2) are arranged opposite each other. Two clamping members (3) are located between the two tabs (1b2). The opposite direction of the two clamping members (3) is perpendicular to the opposite direction of the two tabs (1b2). The outer end of the clamping member (3) extends out of the tab (1b2) along the opposite direction of the two clamping members (3). Each clamping member (3) is connected to two elastic parts (5). The two elastic parts (5) are respectively connected between the outer end of the clamping member (3) and the two tabs (1b2).

3. The pencil feeding mechanism of the automatic pencil sharpener according to claim 2, characterized in that, The elastic part (5) is bent into a corrugated shape along the opposite direction of the two clamping members (3).

4. The feeding mechanism of the automatic pencil sharpener according to claim 3, characterized in that, The connection between the elastic part (5) and the outer end of the clamping member (3) is smoothly transitioned.

5. The pencil feeding mechanism of the automatic pencil sharpener according to claim 1, 2, 3, or 4, characterized in that, Both clamping members (3) have a downwardly inclined guide surface (3a) on the upper side of their inner ends.

6. The pencil feeding mechanism of the automatic pencil sharpener according to claim 5, characterized in that, Both clamping members (3) have downward folded portions (3b) at their inner ends.

Images