Electric pencil sharpener

Abstract

The utility model relates to the technical field of pencil sharpeners, in particular to an electric pencil sharpener which comprises a driving gear, a driven gear and a sharpening stopping mechanism, the sharpening stopping mechanism comprises a transmission rod assembly and a transmission gear, and the transmission gear is arranged on the transmission rod assembly and synchronously moves along with the transmission rod assembly. The transmission gear is respectively meshed with the driving gear and the driven gear, the driving gear drives the transmission gear to rotate so as to drive the driven gear to rotate, the transmission rod assembly moves upwards or downwards to enable the transmission gear to be separated from the driving gear and / or the driven gear, and the driven gear can stop rotating, so that the pencil does not continue to be inserted downwards any more. And even if the motor still rotates, the cutting edge cannot further sharpen the pen point, so that the situation of core breakage caused by excessive sharpening of the pen point is avoided.

Description

Technical Field

[0001] The present disclosure relates to the technical field of pencil sharpeners, and more particularly to an electric pencil sharpener. Background Art

[0002] A pencil sharpener is a common stationery item in daily life, used for cutting pencil, eyebrow pencil and other pen tools. Common pencil sharpeners are mainly divided into two categories: manual and electric. Currently, electric pencil sharpeners are becoming more and more popular.

[0003] The electric pencil sharpener completes the cutting of the pencil through automatic pen feeding, pencil sharpening, and pen discharging. The electric pencil sharpener uses a power device to rotate the rubber wheels. The two rubber wheels are respectively located on both sides of the pencil to be cut, and the rotation directions of the two rubber wheels are opposite. The pencil can move upward or downward under the rotation of the two rubber wheels. The friction area for controlling the entry and exit of the pencil and the clamping force area for preventing the pencil from rotating are at the same position. There is a knife rest assembly below the rubber wheels, which can realize the cutting of the pencil. When the rotation directions of the two rubber wheels rotate towards one side of the pencil respectively, that is, both rotate towards the inside, the pencil to be cut moves downward. When the pencil to be cut is in the working area of the knife rest assembly, the cutting work can be completed; after the cutting is completed, the rotation directions of the two rubber wheels rotate towards the outside of the pencil respectively, realizing the upward movement of the pencil, and then taking the pencil away from the working area of the knife rest assembly.

[0004] When the electric pencil sharpener is in use, after the tip of the pencil is sharpened, the motor often still rotates several circles. At this time, the sharpened pencil will further move downward, and the blade will continue to sharpen the tip of the pencil under the drive of the motor, which greatly increases the risk of broken cores, not only causing waste of resources but also bringing great inconvenience to users. Summary of the Utility Model

[0005] In view of the deficiencies or problems existing in the prior art, the present disclosure provides an electric pencil sharpener that can effectively prevent the occurrence of broken cores during operation.

[0006] The technical solution adopted by the present disclosure to solve the above technical problems is: an electric pencil sharpener, comprising: a driving gear, a driven gear, and a sharpening stop mechanism. The sharpening stop mechanism includes a transmission rod assembly and a transmission gear. The transmission gear is arranged on the transmission rod assembly and moves synchronously with the transmission rod assembly. The transmission gear meshes with the driving gear and the driven gear respectively. The driving gear drives the transmission gear to rotate, and then drives the driven gear to rotate. The upward or downward movement of the transmission rod assembly disengages the transmission gear from the driving gear and / or the driven gear.

[0007] As a preferred embodiment, it further includes a tool rest and a motor for driving the tool rest to rotate. The driving gear is arranged between the tool rest and the driven gear, and the driving gear rotates together with the tool rest. The driving gear and the driven gear rotate around the same axis, and the transmission gear is arranged on the side of the driving gear and the driven gear.

[0008] As a preferred embodiment, the sharpening stop mechanism further includes a push rod and a push seat assembly arranged below the push rod. The upper end of the push rod is located in the tool rest, and the lower end of the push rod contacts the push seat assembly. After the pencil is sharpened, the tip touches the push rod downward and presses the push rod downward. The push seat assembly drives the transmission rod assembly to move upward or downward under the action of the push rod.

[0009] As a preferred embodiment, the push seat assembly includes a first push seat and a second push seat. The lower end of the push rod contacts the first push seat. An arc-shaped protrusion is arranged on the first push seat. One end of the second push seat is a slope, and the other end is provided with a convex block. The slope contacts the lower surface of the arc-shaped protrusion. When the push rod is pressed downward, the first push seat moves downward, and the first push seat pushes the second push seat to move towards the transmission rod assembly. The convex block contacts the transmission rod assembly and drives the transmission rod assembly to move upward or downward.

[0010] As a preferred embodiment, the transmission rod assembly includes a first rod body and a second rod body. The first rod body is arranged above the second rod body. The transmission gear is arranged on the first rod body. A threaded section is arranged on the second rod body. The convex block contacts the threaded section and drives the second rod body to move upward or downward. The first rod body and the second rod body move synchronously.

[0011] As a preferred embodiment, the convex block is provided with an arc-shaped structure for adapting to the threaded section, and a chamfer is arranged at the upper end of the convex block.

[0012] As a preferred embodiment, it further includes a trigger switch. The trigger switch is arranged below the transmission rod assembly. The trigger switch is electrically connected to the motor. The second rod body moves downward under the action of the convex block and touches the trigger switch, and the motor stops running.

[0013] As a preferred embodiment, it further includes a pen feeding mechanism. The pen feeding mechanism is arranged on the driven gear. The pen feeding mechanism includes a first runner assembly and a second runner assembly. The first runner assembly includes a first main shaft. A first gear and a first clamping wheel are arranged on the first main shaft. The second runner assembly includes a second main shaft. A second gear and a second clamping wheel are arranged on the second main shaft. The first gear and the second gear rotate together with the driven gear. The rotation of the first gear drives the first clamping wheel to rotate, and the rotation of the second gear drives the second clamping wheel to rotate. The first clamping wheel and the second clamping wheel rotate synchronously and in opposite directions.

[0014] As a preferred embodiment, a spiral structure is provided on the upper surface of the driven gear. The spiral structure rotates together with the driven gear. The first gear and the second gear are arranged on the movement path of the spiral section. The rotation of the driven gear drives the rotation of the first gear and the second gear.

[0015] As a preferred embodiment, one end face of the first clamping wheel contacts the first gear, one end face of the second clamping wheel contacts the second gear. Concavities are provided in the middle of the first clamping wheel and the second clamping wheel. The diameters at both ends of the first clamping wheel and the second clamping wheel are larger than the diameter in the middle.

[0016] Compared with existing products, since the transmission gear meshes with the driving gear and the driven gear respectively, the driving gear drives the transmission gear to rotate, and then drives the driven gear to rotate. The upward or downward movement of the transmission rod assembly disengages the transmission gear from the driving gear and / or the driven gear, and the driven gear can stop rotating. In this way, the pencil will no longer be inserted downward. Even if the motor is still rotating, the blade cannot further sharpen the tip of the pencil. Thus, the occurrence of the core breakage caused by over-sharpening of the tip of the pencil is avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Hereinafter, the present application will be further described in detail with reference to the drawings and preferred embodiments. However, those skilled in the art will appreciate that these drawings are only drawn for the purpose of explaining the preferred embodiments and should not be construed as limiting the scope of the present application. In addition, unless otherwise specified, the drawings only schematically show the composition or structure of the described object and may include exaggerated displays, and the drawings are not necessarily drawn to scale.

[0018] Figure 1 is one of the schematic structural diagrams of an electric pencil sharpener according to the present disclosure;

[0019] Figure 2 is another schematic structural diagram of an electric pencil sharpener according to the present disclosure;

[0020] Figure 3 is one of the schematic structural diagrams of the second pushing seat according to the present disclosure;

[0021] Figure 4 is another schematic structural diagram of the second pushing seat according to the present disclosure;

[0022] Figure 5 is another schematic structural diagram of the electric pencil sharpener according to the present disclosure;

[0023] Figure 6 is the schematic structural diagram of the pushing seat assembly according to the present disclosure;

[0024] Figure 7 is the schematic structural diagram when the transmission gear disengages from the driving gear according to the present disclosure;

[0025] Figure 8 It is a schematic structural diagram when the driving gear and the driven gear of the present disclosure are disengaged;

[0026] Figure 9 It is a schematic structural diagram of the driven gear of the present disclosure.

[0027] Explanation of reference numerals:

[0028] 1. Driving gear; 2. Driven gear; 21. Spiral structure; 3. Pen feeding mechanism; 31. First main shaft; 32. First gear; 33. First clamping wheel; 34. Second main shaft; 35. Second gear; 36. Second clamping wheel; 4. Push rod; 5. Push seat assembly; 51. First push seat; 511. Arc-shaped protrusion; 52. Second push seat; 521. Inclined surface; 522. Bump; 5221. Chamfer; 6. First rod body; 7. Second rod body; 71. Threaded section; 8. Transmission gear; 9. Tool rest; 10. Trigger switch. Detailed implementation manners

[0029] In order to enable those skilled in the art to better understand the technical solutions of the present disclosure, the present disclosure will be described in detail, clearly and completely below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present disclosure and are not used to limit the present disclosure.

[0030] Those skilled in the art should understand that in the disclosure of the present utility model, the orientation or positional relationship indicated by terms such as "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limiting the present utility model.

[0031] Please refer to Figures 1-2 、 Figures 7-8As shown in the figure, the present disclosure provides an electric pencil sharpener, which includes a driving gear 1, a driven gear 2, and a sharpening stop mechanism. The sharpening stop mechanism includes a transmission rod assembly and a transmission gear 8. The transmission gear 8 is arranged on the transmission rod assembly and moves synchronously with the transmission rod assembly. The transmission gear 8 meshes with the driving gear 1 and the driven gear 2 respectively. The driving gear 1 drives the transmission gear 8 to rotate, and then drives the driven gear 2 to rotate. The upward or downward movement of the transmission rod assembly disengages the transmission gear 8 from the driving gear 1 and / or the driven gear 2. Specifically, the driven gear 2 is arranged above the driving gear 1. The upward or downward movement of the transmission rod assembly drives the up and down movement of the transmission gear 8. When the lower end of the transmission gear 8 moves upward beyond the thickness of the driving gear 1, the transmission gear 8 disengages from the driving gear 1, and the transmission gear 8 no longer rotates with the driving gear 1. When the transmission gear 8 stops rotating, the driven gear 2 also stops rotating. When the upper end of the transmission gear 8 moves downward below the driven gear 2, the transmission gear 8 disengages from the driven gear 2. At this time, the driving gear 1 and the transmission gear 8 are in a meshing state, and the transmission gear 8 rotates with the driving gear 1. Since the transmission gear 8 is disengaged from the driven gear 2, the driven gear 2 no longer rotates with the transmission gear 8. In this way, the pencil no longer continues to be inserted downward. Even if the motor is still rotating, the blade cannot further sharpen the tip of the pencil. Thus, the occurrence of the situation of broken cores caused by excessive sharpening of the tip of the pencil is avoided. It can be understood that when the lower end of the transmission gear 8 moves upward beyond the upper surface of the driven gear 2 or when the upper end of the transmission gear 8 moves downward below the lower surface of the driving gear 1, the driven gear 2 will not rotate.

[0032] In an embodiment of the present disclosure, it further includes a tool rest 9 and a motor for driving the tool rest 9 to rotate. The driving gear 1 is arranged between the tool rest 9 and the driven gear 2. The driving gear 1 rotates with the tool rest 9. The driving gear 1 and the driven gear 2 rotate around the same axis. The transmission gear 8 is arranged on the side of the driving gear 1 and the driven gear 2. Specifically, the driving gear 1 and the driven gear 2 have the same diameter, and the thickness of the transmission gear 8 should be greater than or equal to the sum of the thicknesses of the driving gear 1 and the driven gear 2. The transmission gear 8 is arranged on the side of the driving gear 1 and the driven gear 2, which can simultaneously mesh the driving gear 1 and the driven gear 2 with the transmission gear 8, so as to drive the driven gear 2 to rotate together. Such a setting not only makes the transmission stable and reliable but also makes the structure more compact, avoiding waste of space.

[0033] Please refer to Figures 3-6As shown in the figure, further, the sharpening stop mechanism further includes a push rod 4 and a push seat assembly 5 arranged below the push rod 4. The upper end of the push rod 4 is located in the tool rest 9. The lower end of the push rod 4 contacts the push seat assembly 5. After the pencil is sharpened, the tip touches the push rod 4 downward and presses the push rod 4 downward. The push seat assembly 5 drives the transmission rod assembly to move upward or downward under the action of the push rod 4. Specifically, the push seat assembly 5 includes a first push seat 51 and a second push seat 52. The lower end of the push rod 4 contacts the first push seat 51. An arc-shaped protrusion 511 is arranged on the first push seat 51. One end of the second push seat 52 is a slope 521, and a protrusion 522 is arranged at the other end of the second push seat 52. The slope 521 contacts the lower surface of the arc-shaped protrusion 511. When the push rod 4 is pressed downward, the first push seat 51 moves downward. The first push seat 51 pushes the second push seat 52 to move toward the transmission rod assembly. Subsequently, the protrusion 522 contacts the transmission rod assembly and drives the transmission rod assembly to move upward or downward.

[0034] Furthermore, the transmission rod assembly includes a first rod body 6 and a second rod body 7. The first rod body 6 is arranged above the second rod body 7. A transmission gear 8 is arranged on the first rod body 6. A helically upward threaded section 71 is arranged on the second rod body 7. The protrusion 522 contacts the threaded section 71 and drives the second rod body 7 to move upward or downward. The first rod body 6 and the second rod body 7 move synchronously. Specifically, when the transmission gear 8 rotates, both the second rod body 7 and the first rod body 6 rotate. When the second rod body 7 rotates clockwise, after the protrusion 522 contacts the threaded section 71, it drives the second rod body 7 to move upward. Then the first rod body 6 and the transmission gear 8 also move upward. When the lower end of the transmission gear 8 moves upward beyond the thickness of the driving gear 1, the transmission gear 8 disengages from the driving gear 1, and the transmission gear 8 stops rotating, and the driven gear 2 also stops rotating. When the second rod body 7 rotates counterclockwise, after the protrusion 522 contacts the threaded section 71, it drives the second rod body 7 to move downward. When the upper end of the transmission gear 8 moves downward below the lower surface of the driven gear 2, the transmission gear 8 disengages from the driven gear 2, and the driven gear 2 no longer rotates with the transmission gear 8.

[0035] Please continue to refer to Figure 4 As shown in the figure, particularly, the protrusion 522 is provided with an arc-shaped structure for adapting to the threaded section 71. A chamfer 5221 is arranged at the upper end of the protrusion 522. The setting of the chamfer 5221 makes the upper end of the protrusion 522 more rounded, avoiding collisions when the upper end of the protrusion 522 is too sharp and contacts the threaded section 71. This will not only generate noise but also the vibration generated during the collision will affect the stability of the sharpening stop mechanism. In addition, the setting of the chamfer 5221 can also make the protrusion 522 enter the threaded section 71 more smoothly.

[0036] In an embodiment of the present disclosure, a trigger switch 10 is further included. The trigger switch 10 is disposed below the transmission rod assembly. The trigger switch 10 is electrically connected or signal-connected to the motor. When the second rod body 7 moves downward under the action of the bump 522 and touches the trigger switch 10, the motor stops running, thereby causing the tool rest 9 to stop running.

[0037] As Figure 5 shown, as a preferred embodiment, a pen feeding mechanism 3 is further included. The pen feeding mechanism 3 is disposed on the driven gear 2. The pen feeding mechanism 3 includes a first runner assembly and a second runner assembly. The first runner assembly includes a first main shaft 31. A first gear 32 and a first clamping wheel 33 are disposed on the first main shaft 31. The second runner assembly includes a second main shaft 34. A second gear 35 and a second clamping wheel 36 are disposed on the second main shaft 34. The first gear 32 and the second gear 35 rotate together with the driven gear 2. The rotation of the first gear 32 drives the rotation of the first clamping wheel 33. The rotation of the second gear 35 drives the rotation of the second clamping wheel 36. The first clamping wheel 33 and the second clamping wheel 36 rotate synchronously and in opposite directions. When feeding the pen, the pencil is located between the first clamping wheel 33 and the second clamping wheel 36. As the first clamping wheel 33 and the second clamping wheel 36 rotate, the pencil slowly penetrates into the tool rest 9.

[0038] Please refer to Figure 9 shown. Further, a spiral structure 21 is disposed on the upper surface of the driven gear 2. The spiral structure 21 rotates together with the driven gear 2. The first gear 32 and the second gear 35 are disposed on the movement path of the spiral section. The rotation of the driven gear 2 drives the rotation of the first gear 32 and the second gear 35. One end surface of the first clamping wheel 33 contacts the first gear 32. One end surface of the second clamping wheel 36 contacts the second gear 35. Concaves are provided in the middle of the first clamping wheel 33 and the second clamping wheel 36, and the concaves of the first clamping wheel 33 and the second clamping wheel 36 correspond to each other. The diameters of both ends of the first clamping wheel 33 and the second clamping wheel 36 are larger than the diameter of the middle part. When sharpening the pencil, the pencil extends between the concaves of the first clamping wheel 33 and the second clamping wheel 36 and is clamped. Due to the action of friction, the first clamping wheel 33 and the second clamping wheel 36 respectively rotate synchronously and in opposite directions following the first gear 32 and the second gear 35.

[0039] The above has introduced the present application in detail. Specific examples are used in this article to elaborate on the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the present application and its core idea. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of the present application, several improvements and modifications can still be made to the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. An electric pencil sharpener, characterized in that, Comprising: A driving gear (1), a driven gear (2) and a sharpening stop mechanism. The sharpening stop mechanism includes a transmission rod assembly and a transmission gear (8). The transmission gear (8) is arranged on the transmission rod assembly and moves synchronously with the transmission rod assembly. The transmission gear (8) meshes with the driving gear (1) and the driven gear (2) respectively. The driving gear (1) drives the transmission gear (8) to rotate, and then drives the driven gear (2) to rotate. The upward or downward movement of the transmission rod assembly disengages the transmission gear (8) from the driving gear (1) and / or the driven gear (2).

2. The electric pencil sharpener according to claim 1, characterized in that, It further includes a tool rest (9) and a motor for driving the rotation of the tool rest (9). The driving gear (1) is arranged between the tool rest (9) and the driven gear (2). The driving gear (1) rotates together with the tool rest (9). The driving gear (1) and the driven gear (2) rotate around the same axis. The transmission gear (8) is arranged on the side of the driving gear (1) and the driven gear (2).

3. The electric pencil sharpener according to claim 2, characterized in that, The sharpening stop mechanism further includes a push rod (4) and a push seat assembly (5) arranged below the push rod (4). The upper end of the push rod (4) is located in the tool rest (9). The lower end of the push rod (4) contacts the push seat assembly (5). After the pencil is sharpened, the tip touches the push rod (4) downward and presses the push rod (4) downward. The push seat assembly (5) drives the transmission rod assembly to move upward or downward under the action of the push rod (4).

4. The electric pencil sharpener according to claim 3, characterized in that, The push seat assembly (5) includes a first push seat (51) and a second push seat (52). The lower end of the push rod (4) contacts the first push seat (51). An arc-shaped protrusion (511) is arranged on the first push seat (51). One end of the second push seat (52) is a slope (521), and the other end is provided with a convex block (522). The slope (521) contacts the lower surface of the arc-shaped protrusion (511). When the push rod (4) is pressed downward, the first push seat (51) moves downward. The first push seat (51) pushes the second push seat (52) to move towards the transmission rod assembly. The convex block (522) contacts the transmission rod assembly and drives the transmission rod assembly to move upward or downward.

5. The electric pencil sharpener according to claim 4, wherein, The transmission rod assembly includes a first rod body (6) and a second rod body (7). The first rod body (6) is arranged above the second rod body (7). The transmission gear (8) is arranged on the first rod body (6). A threaded section (71) is arranged on the second rod body (7). The convex block (522) contacts the threaded section (71) and drives the second rod body (7) to move upward or downward. The first rod body (6) and the second rod body (7) move synchronously.

6. The electric pencil sharpener according to claim 5, wherein The convex block (522) is provided with an arc-shaped structure for adapting to the threaded section (71). A chamfer (5221) is arranged at the upper end of the convex block (522).

7. The electric pencil sharpener according to claim 5, characterized in that It further includes a trigger switch (10). The trigger switch (10) is arranged below the transmission rod assembly. The trigger switch (10) is electrically connected to the motor. The second rod body (7) moves downward under the action of the convex block (522) and touches the trigger switch (10), and the motor stops running.

8. The electric pencil sharpener according to claim 1, characterized in that, It further includes a pen feeding mechanism (3), the pen feeding mechanism (3) is arranged on the driven gear (2), the pen feeding mechanism (3) includes a first runner assembly and a second runner assembly, the first runner assembly includes a first main shaft (31), a first gear (32) and a first clamping wheel (33) are arranged on the first main shaft (31), the second runner assembly includes a second main shaft (34), a second gear (35) and a second clamping wheel (36) are arranged on the second main shaft (34), the first gear (32) and the second gear (35) rotate together with the driven gear (2), the rotation of the first gear (32) drives the first clamping wheel (33) to rotate, the rotation of the second gear (35) drives the second clamping wheel (36) to rotate, and the first clamping wheel (33) and the second clamping wheel (36) rotate synchronously and in opposite directions.

9. The electric pencil sharpener according to claim 8, characterized in that, A spiral structure (21) is arranged on the upper surface of the driven gear (2), the spiral structure (21) rotates together with the driven gear (2), the first gear (32) and the second gear (35) are arranged on the movement path of the spiral section, and the rotation of the driven gear (2) drives the rotation of the first gear (32) and the second gear (35).

10. The electric pencil sharpener according to claim 8, characterized in that, One end face of the first clamping wheel (33) is in contact with the first gear (32), one end face of the second clamping wheel (36) is in contact with the second gear (35), the middle parts of the first clamping wheel (33) and the second clamping wheel (36) are concave, and the diameters of both ends of the first clamping wheel (33) and the second clamping wheel (36) are larger than the diameters of the middle parts.

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