Automatic pencil sharpener

Abstract

The utility model provides an automatic pencil sharpener which belongs to the technical field of pencil sharpeners and comprises a shell, a pencil sharpening assembly, a driving transmission assembly and a microswitch, the pencil sharpening assembly comprises a supporting frame, a pencil holder, a hob and a driving element, and the driving transmission assembly comprises a stop block, a first transmission rod, a second transmission rod, a transmission ring and a transmission frame. When a pencil is inserted into the pencil holder, the pencil holder pushes the supporting frame to move in the containing cavity, so that the transmission ring is pushed, the push rod pushes the transmission frame to be away from the microswitch along with movement of the transmission ring, at the moment, the second contact is separated from the microswitch, and then the driving element is started to drive the pencil holder and the hobbing cutter to rotate to sharpen the pencil; the pen point makes contact with the stopping block so as to push the stopping block to move, the stopping block pushes the second transmission rod, when the second transmission rod makes contact with the first contact and pushes the first transmission rod to rotate, the second contact makes contact with the microswitch again, and therefore rotation of the driving element is stopped.

Description

Technical Field

[0001] The utility model belongs to the technical field of pencil sharpeners and relates to an automatic pencil sharpener. Background Art

[0002] Writing tools like pencils and colored pencils are prone to wear and tear during use due to friction with the paper and the bumps and bruises of daily use. This can cause the lead to lose its sharpness, affecting the quality of writing or drawing. To restore these writing tools to their optimal condition, pencil sharpeners have become indispensable tools. The main function of a pencil sharpener is to sharpen one end of a pencil or colored pencil to a point, ensuring optimal writing performance. There are many types of pencil sharpeners available on the market, including manual and electric models.

[0003] In summary, the current existing electric pencil sharpeners need to be manually turned on each time they are turned on, and the adjustment of the thickness of the pen tip is not convenient enough, resulting in a low user experience and a large room for improvement. Summary of the Invention

[0004] The purpose of this utility model is to solve the above problems existing in the prior art and to provide an automatic pencil sharpener, comprising:

[0005] a housing provided with a receiving cavity;

[0006] A pencil sharpening assembly comprising a support frame, a pen holder, a hob, and a drive element, wherein the drive element can drive the hob and the pen holder to rotate relative to the support frame, wherein the support frame is provided with an internal tooth portion, and the hob is provided with an external tooth portion, wherein the external tooth portion meshes with the internal tooth portion, and during the rotation of the hob and the pen holder, the hob is driven to rotate.

[0007] a drive transmission assembly disposed in the accommodating chamber, comprising a stop block, a first transmission rod, a second transmission rod, a transmission ring, and a transmission frame; the stop block is slidably disposed on the pen holder; two ends of the first transmission rod are respectively provided with a first contact point and a second contact point; a middle portion of the first transmission rod is rotatably disposed on the transmission frame; the transmission frame is movable within the accommodating chamber; one end of the second transmission rod contacts one end of the stop block, and the other end of the second transmission rod contacts the first contact point; a push rod is provided on one side of the transmission ring, and the other side of the transmission ring contacts the support frame; the push rod can push the transmission frame to move within the accommodating chamber;

[0008] a micro switch disposed in the accommodating cavity, wherein a trigger portion of the micro switch contacts the second contact, and the micro switch is electrically connected to the driving element;

[0009] When a pencil is inserted into the pen holder, the pen holder pushes the support frame to move within the accommodating cavity, thereby pushing the transmission ring. The push rod pushes the transmission frame away from the micro switch as the transmission ring moves. At this time, the second contact separates from the trigger part of the micro switch, thereby activating the driving element to drive the pen holder and the roller to rotate to sharpen the pencil;

[0010] When the pencil is sharpened to a set size, the pencil tip contacts the stop block, thereby pushing the stop block to move. The stop block pushes the second transmission rod. When the second transmission rod contacts the first contact and pushes the first transmission rod to rotate, the second contact contacts the trigger part of the micro switch again, thereby stopping the rotation of the driving element.

[0011] In the above-mentioned automatic pencil sharpener, it also includes a fixing frame and an elastic member, the fixing frame is arranged in the accommodating cavity, the transmission frame is movably arranged on the fixing frame, one end of the elastic member contacts the side wall of the fixing frame, and the other end of the elastic member contacts the transmission frame.

[0012] In the above-mentioned automatic pencil sharpener, it further includes a fixing plate, the fixing plate is provided with a strip groove, the transmission frame is provided with a first limiting protrusion, and the first limiting protrusion is movably connected to the strip groove.

[0013] In the above-mentioned automatic pencil sharpener, the transmission frame is further provided with a second limiting protrusion, and the second limiting protrusion contacts one side of the second contact point.

[0014] The above-mentioned automatic pencil sharpener further includes an adjusting knob, a rotating rod and an adjusting block, the fixed plate is arranged in the accommodating cavity, the adjusting knob is rotatably arranged on the shell, the rotating rod is rotatably arranged on the fixed plate, one end of the rotating rod is connected to the adjusting knob, and the other end of the rotating rod is connected to the adjusting block, and the adjusting block is arranged between the first contact and the first transmission rod.

[0015] In the above-mentioned automatic pencil sharpener, the adjustment block is provided with at least two adjustment surfaces which are not in the same plane, each two adjustment surfaces are connected by an adjustment bevel, and the first contact point contacts the adjustment surface back and forth through the adjustment bevel.

[0016] The automatic pencil sharpener further includes a driving gear and a driven gear, wherein the driving gear is connected to the output shaft of the driving element, the driven gear is connected to the pen holder, the driven gear is meshed with the driving gear, and the transmission ring contacts one side of the driven gear.

[0017] In the above-mentioned automatic pencil sharpener, the fixing plate is further provided with a limiting hole, and the transmission ring is further provided with a limiting rod, and the limiting rod is accommodated in the limiting hole.

[0018] In the above-mentioned automatic pencil sharpener, the stop block is provided with a contact piece, and the contact piece is made of a flexible material.

[0019] In the above-mentioned automatic pencil sharpener, the shell includes a base, a chip storage box and a rear shell, the chip storage box is detachably connected to the base, the rear shell is detachably connected to the base, the chip storage box and the rear shell form a chip storage space, and the hob and the pen holder are accommodated in the chip storage space.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] 1. The user only needs to insert the pen into the pen holder and push it into the pen holder to activate the drive element through the drive transmission assembly to sharpen the pencil. This design ensures that the pencil sharpener can automatically detect the degree of pencil sharpening and automatically stop when the set size is reached, which not only ensures the accuracy of pencil sharpening, but also reduces the user's physical exertion and improves the user experience.

[0022] 2. The maximum rotation range of the first transmission rod is limited by the first limiting protrusion, so that the second contact can stably apply thrust to the trigger part of the micro switch under normal conditions.

[0023] 3. The driven gear is set between the transmission ring and the pen holder. It can not only push the transmission ring, but also transmit the power of the driving element to the pen holder through engagement with the driving gear, which not only improves the efficiency of power transmission but also reduces production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural diagram of the present utility model.

[0025] Figure 2 It is a schematic diagram of the internal structure of the utility model.

[0026] Figure 3 This is a schematic diagram of the drive transmission assembly of the utility model.

[0027] Figure 4 for Figure 3 Enlarged view of detail A.

[0028] Figure 5 It is a schematic diagram of the adjustment component in the present invention.

[0029] Figure 6 for Figure 5 Enlarged view of detail B.

[0030] Figure 7 This is a structural diagram of the second transmission rod of the utility model.

[0031] In the picture:

[0032] 1. Shell; 11. Accommodating chamber; 12. Base; 13. Chip storage box; 14. Back shell; 15. Chip storage space; 2. Pencil sharpener assembly; 21. Support frame; 211. Inner tooth portion; 22. Pen holder; 23. Hob; 231. Outer tooth portion; 24. Driving element; 3. Driving transmission assembly; 31. Stop block; 32. First transmission rod; 321. First contact; 322. Second contact; 33. Second transmission rod; 34. Transmission ring; 341. Push rod; 342. Limit rod; 35. Transmission frame; 351. First limiting protrusion; 352. Second limiting protrusion; 4. Micro switch; 5. Fixing frame; 51. Elastic member; 6. Fixing plate; 61. Strip groove; 7. Adjusting knob; 71. Rotating rod; 72. Adjusting block; 721. Adjusting surface; 722. Adjusting inclined surface; 8. Driving gear; 81. Driven gear. DETAILED DESCRIPTION

[0033] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0034] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0035] In addition, terms such as "first," "second," and "an" in this utility model are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features indicated. Therefore, features specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0036] In this utility model, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0037] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in this field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this utility model.

[0038] The specific embodiments described herein are merely examples of the present utility model. Those skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the scope of the present utility model or exceeding the scope defined by the appended claims.

[0039] like Figure 1-Figure 7 As shown, an automatic pencil sharpener includes: a housing 1, a pencil sharpening assembly 2, a drive transmission assembly 3 and a micro switch 4.

[0040] Among them, the pencil sharpening assembly 2 includes a support frame 21, a pen holder 22, a hob 23 and a driving element 24. The driving element 24 can drive the hob 23 and the pen holder 22 to rotate relative to the support frame 21. The support frame 21 is provided with an inner tooth portion 211, and the hob 23 is provided with an outer tooth portion 231. The outer tooth portion 231 is engaged with the inner tooth portion 211. During the rotation of the hob 23 and the pen holder 22, the hob 23 is driven to rotate.

[0041] Among them, the drive transmission assembly 3 is arranged in the accommodating chamber 11, and the drive transmission assembly 3 includes a stop block 31, a first transmission rod 32, a second transmission rod 33, a transmission ring 34 and a transmission frame 35. The stop block 31 is slidably arranged on the pen holder 22, and the two ends of the first transmission rod 32 are respectively set as a first contact 321 and a second contact 322. The middle part of the first transmission rod 32 is rotatably set on the transmission frame 35, and the transmission frame 35 can move in the accommodating chamber 11. One end of the second transmission rod 33 contacts one end of the stop block 31, and the other end of the second transmission rod 33 contacts the first contact 321. A push rod 341 is provided on one side of the transmission ring 34, and the other side of the transmission ring 34 contacts the support frame 21. The push rod 341 can push the transmission frame 35 to move in the accommodating chamber 11.

[0042] The micro switch 4 is disposed in the accommodating cavity 11 , a trigger portion of the micro switch 4 contacts the second contact 322 , and the micro switch 4 is electrically connected to the driving element 24 .

[0043] Specifically, when a pencil is inserted into the pen holder 22, the pen holder 22 pushes the support frame 21 to move within the accommodating cavity 11, thereby pushing the transmission ring 34. The push rod 341 moves along with the transmission ring 34, thereby pushing the transmission frame 35 away from the micro switch 4. At this time, the second contact 322 is separated from the trigger part of the micro switch 4, thereby activating the driving element 24 to drive the pen holder 22 and the roller 23 to rotate to sharpen the pencil.

[0044] When the pencil is sharpened to a set size, the pencil tip contacts the stop block 31, thereby pushing the stop block 31 to move. The stop block 31 pushes the second transmission rod 33. When the second transmission rod 33 contacts the first contact 321 and pushes the first transmission rod 32 to rotate, the second contact 322 contacts the trigger part of the micro switch 4 again, thereby stopping the rotation of the driving element 24.

[0045] In this embodiment, the user only needs to insert the pen into the pen holder 22 and push it into the pen holder 22 to activate the driving element 24 by driving the transmission assembly 3 to sharpen the pencil. This design ensures that the pencil sharpener can automatically detect the degree of sharpening of the pencil and automatically stop when the set size is reached, which not only ensures the accuracy of pencil sharpening, but also reduces the user's physical exertion and improves the user experience.

[0046] like Figure 1-Figure 7 As shown, on the basis of the above embodiment, it further includes a fixing frame 5 and an elastic member 51, the fixing frame 5 is arranged in the accommodating cavity 11, the transmission frame 35 is movably arranged on the fixing frame 5, one end of the elastic member 51 contacts the side wall of the fixing frame 5, and the other end of the elastic member 51 contacts the transmission frame 35.

[0047] In this embodiment, the transmission frame 35 moves toward the micro switch 4 under the action of the fixing frame 5 and the elastic member 51, so that the first transmission rod 32 located on the transmission frame 35 can always generate thrust on the trigger part of the micro switch 4 under normal conditions, ensuring that the driving element 24 will not start.

[0048] like Figure 1-Figure 7 As shown, based on the above embodiment, the transmission frame 35 is provided with a first limiting protrusion 351 , and the first limiting protrusion 351 contacts one side of the second contact 322 .

[0049] Specifically, the second contact 322 contacts the trigger portion of the micro switch 4 , and the other side of the second contact 322 abuts against the first limiting protrusion 351 , limiting the rotation range of the first transmission rod 32 on the transmission frame 35 .

[0050] In this embodiment, the maximum rotation range of the first transmission rod 32 is limited by the first limiting protrusion 351, so that the second contact 322 can stably apply thrust to the triggering part of the micro switch 4 under normal conditions.

[0051] like Figure 1-Figure 7 As shown, on the basis of the above embodiment, it also includes a fixing plate 6, which is arranged in the accommodating cavity 11, and the fixing plate 6 is provided with a strip groove 61. The transmission frame 35 is also provided with a second limiting protrusion 352, and the second limiting protrusion 352 is movably connected to the strip groove 61.

[0052] Specifically, the length direction of the strip groove 61 is the same as the moving direction of the transmission ring 34 . When the push rod 341 on the transmission ring 34 pushes the transmission frame 35 to move, the second limiting protrusion 352 on the transmission frame 35 can move in the strip groove 61 .

[0053] In this embodiment, the second limiting protrusion 352 is accommodated in the strip groove 61, which can limit the maximum depth of the pen holder 22 pushing the transmission frame 35, and at the same time ensure that the second transmission rod 33 pushed by the stop block 31 contacted by the pen tip can contact the second contact point 322, thereby pausing the driving element 24.

[0054] like Figure 1-Figure 7 As shown, on the basis of the above embodiment, it also includes an adjusting knob 7, a rotating rod 71 and an adjusting block 72, the adjusting knob 7 is rotatably set on the shell 1, the rotating rod 71 is rotatably set on the fixed plate 6, one end of the rotating rod 71 is connected to the adjusting knob 7, and the other end of the rotating rod 71 is connected to the adjusting block 72, and the adjusting block 72 is set between the first contact 321 and the second transmission rod 33.

[0055] Specifically, the middle part of the rotating rod 71 is rotatably connected to the fixed plate 6. When the adjusting knob 7 is rotated clockwise, the rotating rod 71 rotates in the opposite direction, thereby driving the adjusting block 72 to rotate counterclockwise around the connection point between the rotating rod 71 and the fixed plate 6, thereby changing the thickness of the adjusting block 72 located between the first contact 321 and the second transmission rod 33.

[0056] In this embodiment, by rotating the adjustment knob 7 on the housing 1, the rotating rod 71 can be driven to drive the adjustment block 72 to rotate, thereby changing the thickness of the adjustment block 72 located between the first contact point 321 and the second transmission rod 33. This changes the distance that the pencil tip pushes the stop block 31 to push the first contact point 321 via the second transmission rod 33, ultimately causing the thickness of the pencil tip to change.

[0057] like Figure 1-Figure 7As shown, based on the above embodiment, the adjustment block 72 is provided with at least two adjustment surfaces 721 that are not in the same plane, and each two adjustment surfaces 721 are connected by an adjustment bevel 722, and the first contact 321 contacts back and forth with the adjustment surface 721 through the adjustment bevel 722.

[0058] Specifically, the adjustment block 72 is provided with three adjustment surfaces 721 with decreasing heights in sequence, and each adjustment surface 721 is connected by an adjustment bevel 722. When the adjustment block 72 rotates with the adjustment knob 7, the first contact 321 can switch between each adjustment surface 721 through the contact surface between the adjustment bevel 722 and the adjustment block 72.

[0059] In this embodiment, by rotating the adjusting knob 7, the contact surface between the first contact point 321 and the adjusting block 72 is switched. This design allows the user to adjust the thickness of the pencil tip through a simple knob operation.

[0060] like Figure 1-Figure 7 As shown, on the basis of the above embodiment, it further includes a driving gear 8 and a driven gear 81, the driving gear 8 is connected to the output shaft of the driving element 24, the driven gear 81 is connected to the pen holder 22, the driven gear 81 is engaged with the driving gear 8, and the transmission ring 34 is in contact with one side of the driven gear 81.

[0061] Specifically, one end of the pen holder 22 is connected to one side of the driven gear 81. When a pencil is inserted into the pen holder 22 and pushes the driven gear 81, the other side of the driven gear 81 contacts the transmission ring 34, thereby pushing the transmission ring 34 to move. At this time, the push rod 341 on the transmission ring 34 pushes the transmission frame 35 away from the micro switch 4, thereby separating the second contact 322 of the first transmission rod 32 provided on the transmission frame 35 from the trigger part of the micro switch 4, so that the driving element 24 electrically connected to the micro switch 4 is started, and the output shaft of the driving element 24 drives the active gear 8 to rotate, driving the driven gear 81 to rotate synchronously, and finally driving the pen holder 22 to rotate to sharpen the pencil.

[0062] In this embodiment, the driven gear 81 is arranged between the transmission ring 34 and the pen holder 22, which can not only push the transmission ring 34, but also transmit the power of the driving element 24 to the pen holder 22 through engagement with the driving gear 8, which not only improves the efficiency of power transmission but also reduces production costs.

[0063] like Figure 1-Figure 7 As shown, on the basis of the above embodiment, the fixing plate 6 is further provided with a limiting hole (not shown in the figure), and the transmission ring 34 is further provided with a limiting rod 342, and the limiting rod 342 is accommodated in the limiting hole.

[0064] Specifically, after the driven gear 81 pushes the transmission ring 34 to move, the trigger driving element 24 drives the driven gear 81 to rotate. At this time, the limiting rod 342 on the transmission ring 34 is accommodated in the limiting hole on the fixing plate 6, which can prevent the transmission ring 34 and the driven gear 81 from rotating due to contact.

[0065] In this embodiment, by preventing the transmission ring 34 from rotating, the push rod 341 on the transmission ring 34 can stably contact the transmission frame 35, thereby improving the stability of the entire drive transmission assembly 3.

[0066] like Figure 1-Figure 7 As shown, on the basis of the above embodiment, the stop block 31 is provided with a contact piece (not shown in the figure), and the contact piece is made of flexible material.

[0067] Specifically, after the pencil is sharpened in the pen holder 22 , it continues to approach the stop block 31 , pushing the stop block 31 toward the first contact point 321 , and the pencil tip contacts the contact piece on the stop block 31 .

[0068] In this embodiment, the contact block is made of a flexible material to prevent the pen tip in contact with the contact element from being worn or broken.

[0069] like Figure 1-Figure 7 As shown, based on the above embodiment, the shell 1 includes a base 12, a chip storage box 13 and a rear shell 14, the chip storage box 13 is detachably connected to the base 12, the rear shell 14 is detachably connected to the base 12, the chip storage box 13 and the rear shell 14 form a chip storage space 15, and the hob 23 and the pen holder 22 are accommodated in the chip storage space 15.

[0070] In this embodiment, the chip storage space 15 formed by the chip storage box 13 and the rear shell 14 stores the pencil chips generated by the pencil sharpening assembly 2 separately in the chip storage space 15 to prevent the chips from affecting the transmission between the drive transmission assembly 3 .

Claims

1. An automatic pencil sharpener, characterized in that: include: a housing provided with a receiving cavity; A pencil sharpening assembly comprising a support frame, a pen holder, a hob, and a drive element, wherein the drive element can drive the hob and the pen holder to rotate relative to the support frame, wherein the support frame is provided with an internal tooth portion, and the hob is provided with an external tooth portion, wherein the external tooth portion meshes with the internal tooth portion, and during the rotation of the hob and the pen holder, the hob is driven to rotate. a drive transmission assembly disposed in the accommodating chamber, comprising a stop block, a first transmission rod, a second transmission rod, a transmission ring, and a transmission frame; the stop block is slidably disposed on the pen holder; two ends of the first transmission rod are respectively provided with a first contact point and a second contact point; a middle portion of the first transmission rod is rotatably disposed on the transmission frame; the transmission frame is movable within the accommodating chamber; one end of the second transmission rod contacts one end of the stop block, and the other end of the second transmission rod contacts the first contact point; a push rod is provided on one side of the transmission ring, and the other side of the transmission ring contacts the support frame; the push rod can push the transmission frame to move within the accommodating chamber; A micro switch is disposed in the accommodating cavity, a trigger portion of the micro switch contacts the second contact, and the micro switch is electrically connected to the drive element. The user only needs to insert the pen into the pen holder and push it into the pen holder to activate the drive element via the drive transmission assembly to sharpen the pencil. This design ensures that the pencil sharpener can automatically detect the degree of pencil sharpening and automatically stop when the set size is reached, thereby ensuring pencil sharpening accuracy, reducing the user's physical exertion, and improving the user experience. When a pencil is inserted into the pen holder, the pen holder pushes the support frame to move within the accommodating cavity, thereby pushing the transmission ring. The push rod pushes the transmission frame away from the micro switch as the transmission ring moves. At this time, the second contact separates from the trigger part of the micro switch, thereby activating the driving element to drive the pen holder and the roller to rotate to sharpen the pencil; When the pencil is sharpened to a set size, the pencil tip contacts the stop block, thereby pushing the stop block to move. The stop block pushes the second transmission rod. When the second transmission rod contacts the first contact and pushes the first transmission rod to rotate, the second contact contacts the trigger part of the micro switch again, thereby stopping the rotation of the driving element.

2. The automatic pencil sharpener according to claim 1, wherein: It also includes a fixing frame and an elastic member, the fixing frame is arranged in the accommodating cavity, the transmission frame is movably arranged on the fixing frame, one end of the elastic member contacts the side wall of the fixing frame, and the other end of the elastic member contacts the transmission frame.

3. The automatic pencil sharpener according to claim 2, wherein: The transmission frame is provided with a first limiting protrusion, and the first limiting protrusion contacts one side of the second contact point.

4. An automatic pencil sharpener according to claim 3, characterized in that: It also includes a fixing plate, which is arranged in the accommodating cavity and is provided with a strip groove. The transmission frame is also provided with a second limiting protrusion, and the second limiting protrusion is movably connected to the strip groove.

5. The automatic pencil sharpener according to claim 4, characterized in that: It also includes an adjusting knob, a rotating rod and an adjusting block, wherein the adjusting knob is rotatably arranged on the shell, the rotating rod is rotatably arranged on the fixed plate, one end of the rotating rod is connected to the adjusting knob, and the other end of the rotating rod is connected to the adjusting block, and the adjusting block is arranged between the first contact and the second transmission rod.

6. The automatic pencil sharpener according to claim 5, characterized in that: The adjustment block is provided with at least two adjustment surfaces which are not in the same plane, and every two adjustment surfaces are connected by an adjustment slope, and the first contact point contacts the adjustment surface back and forth through the adjustment slope.

7. The automatic pencil sharpener according to claim 4, characterized in that: It also includes a driving gear and a driven gear, wherein the driving gear is connected to the output shaft of the driving element, the driven gear is connected to the pen holder, the driven gear is meshed with the driving gear, and the transmission ring contacts one side of the driven gear.

8. The automatic pencil sharpener according to claim 7, wherein: The fixing plate is further provided with a limiting hole, and the transmission ring is further provided with a limiting rod, and the limiting rod is accommodated in the limiting hole.

9. The automatic pencil sharpener according to claim 1, wherein: The stop block is provided with a contact piece, and the contact piece is made of a flexible material.

10. The automatic pencil sharpener according to claim 1, wherein: The shell includes a base, a chip storage box and a rear shell. The chip storage box is detachably connected to the base, and the rear shell is detachably connected to the base. The chip storage box and the rear shell form a chip storage space, and the hob and the pen holder are accommodated in the chip storage space.

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