阅读说明：本技术 可提示削尖的削笔器 (Pencil sharpener capable of prompting sharpening ) 是由 洪祺程 于 2019-10-31 设计创作，主要内容包括：本发明是关于一种可提示削尖的削笔器,其包括一基座、一提示钮、一削笔座以及一触发件,该提示钮与该削笔座分别与该基座相连接,该触发件能摆动地设于该削笔座与该提示钮之间,当一铅笔于该削笔座中削尖后会推抵该触发件,使该触发件摆动并触发该提示钮弹出,由于该铅笔提供的推力,能有效地施加于该触发件的抵靠面,因此不容易出现在推抵过程中造成削好的笔尖断裂的问题,并能有效避免过度刨削铅笔的情形。(The invention relates to a pencil sharpener capable of prompting sharpening, which comprises a base, a prompting button, a pencil sharpening seat and a trigger piece, wherein the prompting button and the pencil sharpening seat are respectively connected with the base, the trigger piece can be arranged between the pencil sharpening seat and the prompting button in a swinging manner, when a pencil is sharpened in the pencil sharpening seat, the trigger piece can be pushed against the trigger piece, so that the trigger piece swings and triggers the prompting button to pop out, and the thrust provided by the pencil can be effectively applied to the abutting surface of the trigger piece, so that the problem of breakage of a sharpened pencil point in the pushing and abutting process is not easy to occur, and the situation of excessively sharpening the pencil can be effectively avoided.)

1. A sharpener capable of prompting sharpening, said sharpener capable of prompting sharpening comprising:

the base is provided with an accommodating groove and a buckle structure;

the prompting button can be movably arranged in the accommodating groove of the base and is provided with an actuating unit and an elastic arm, the actuating unit is arranged between the prompting button and the accommodating groove, and the elastic arm can be buckled with the buckle structure to enable the prompting button to be positioned at a locking position;

the pencil sharpening seat is arranged on the base, a conical groove is formed in the pencil sharpening seat, the conical groove is provided with a central axis, and a wide part and a narrow part are respectively formed at two ends of the conical groove, so that a pencil can be sharpened in the conical groove; and

a trigger piece, the trigger piece can be located with swinging cut the pen stand with the suggestion button between the elastic arm, the trigger piece include one lean on face, a pin joint portion and one connect the actuator part of pin joint portion, just the actuator part supply support lean on in the suggestion button the elastic arm, when the one end of this pencil in sharpen the back in the bell jar, can support and lean on the face messenger of leaning on the trigger piece swing, and then promote the elastic arm breaks away from buckle structure, and triggers the actuator unit motion makes the suggestion button break away from latched position.

2. The sharpener of claim 1 wherein said abutment surface of said trigger member is perpendicular to said central axis, said abutment surface facing said narrow portion of said tapered slot, whereby said pencil can abut said abutment surface after sharpening, thereby urging said trigger member to oscillate.

3. The sharpener of claim 1 wherein said sharpener base has a pivot unit, said pivot portion of said trigger being pivotally connected to said pivot unit.

4. The sharpener of claim 1, wherein the pivot portion has a pivot axis and a length extending from the pivot axis to the central axis, the pivot portion has a length of 1mm to 50mm, the actuation portion has a length extending along the central axis, and the actuation portion has a length of 1mm to 50 mm.

5. The sharpener of claim 4 where said pivot portion is 3.5mm to 7.5mm in length and said actuator portion is 4mm to 14mm in length.

6. The sharpener of claim 1 wherein said sharpener base includes a seat and a blade, said seat being connected to said base, said blade being fixed to said seat and said blade and said seat together defining said tapered slot, said trigger member having a stop flange facing said blade.

7. The sharpener of claim 3 wherein said sharpener base is rotatably coupled to said base, and said base and said sharpener base are coupled by a ratchet mechanism.

8. The sharpener of claim 1, wherein the base has a pivot unit, and the pivot portion is pivotally connected to the pivot unit of the base.

9. The sharpener as claimed in any one of claims 1 to 8, wherein said snap structure includes a snap projection projecting from one side of said receiving groove in a direction of said resilient arm, said resilient arm of said tip button having a snap hole, said resilient arm being snap-fitted with said snap projection through said snap hole.

10. The sharpener of claim 9 wherein the bottom of said sharpener base is provided with a stop tab, said stop tab extending beyond said abutment surface toward said trigger, and said stop tab extending beyond said abutment surface by a length greater than or equal to the length of overlap of said snap tab and said snap hole.

11. The sharpener of claim 9 wherein said cue button includes a base portion disposed in said receiving cavity, said resilient arm extending from said base portion and defining a fulcrum at a junction of said resilient arm and said base portion, said actuator portion being disposed against said resilient arm at a greater distance from said fulcrum than at a junction of said snap tab and said snap aperture.

12. The sharpener of any one of claims 1-8, wherein the receiving slot has at least one limiting channel therethrough, the cue button has at least one guide arm spaced from the resilient arm, the at least one guide arm has a shape matching the shape of the at least one limiting channel, and the at least one guide arm passes through the at least one limiting channel.

Technical Field

The invention relates to a pencil sharpener, in particular to a pencil sharpener capable of prompting sharpening.

Background

Generally, after a pencil is used for a period of time, a pen point of the pencil becomes blunt and short, and the pen point needs to be shaved by a sharpener so that a refill inside the pencil is exposed and sharpened, thereby facilitating subsequent writing or drawing by a user.

Referring to fig. 12, a pencil sharpener 80 with a sharpening prompting device comprises a housing 81, a prompting button 82 and a pushing block 83, wherein the housing 81 is provided with an accommodating groove 811, a pencil sharpener 812 and a slide 813, wherein the accommodating groove 811 is formed by the surface of the housing 81 being recessed; the pencil sharpener 812 is disposed inside the housing 81 and spaced apart from the accommodating groove 811, a blade 814 is disposed on one of the bevel edges of the pencil sharpener 812, and a pencil 90 is inserted into the pencil sharpener 812 and sharpened in the pencil sharpener 812 by the blade 814; the slide 813 is embedded in the bottom of the pencil sharpener 812, extends along the direction of the blade 814, and communicates the pencil sharpener 812 and the receiving groove 811.

The indication button 82 is movably disposed in the accommodation groove 811, the indication button 82 is disposed with a compression spring 821 and a fastening arm 822, the compression spring 821 is disposed between the indication button 82 and the accommodation groove 811, the fastening arm 822 is disposed at a side close to the slide rail 813, and the indication button 82 can be pressed to fasten the fastening arm 822 in the accommodation groove 811; the pushing block 83 is slidably disposed in the sliding way 813. In operation, a user first presses the indication button 82 to position the latch arm 822 at a latching position as shown in fig. 12 and to make the compression spring 821 in a compressed state, when the pencil 90 is sharpened to a predetermined sharpness, the pen point 91 pushes the push block 83, so that the push block 83 slides in the slide way 813 towards the latch arm 822, and finally pushes the latch arm 822 to disengage the latch arm 822 from the latching position, so that the indication button 82 is ejected by the restoring force of the compression spring 821 to indicate to the user that the pencil 90 has been sharpened.

However, the conventional pencil sharpener 80 has the following disadvantages:

1. during the sliding process of the pushing block 83, a friction force is generated between the pushing block 83 and the inner sidewall of the sliding rail 813, which hinders the pushing block 83 from pushing the smooth degree of the movement of the latch arm 822, and causes a resistance to the forward movement of the pen point 91.

2. As shown in fig. 12, since the push block 83 slides along the direction of the extension of the oblique side of the pencil sharpener 812, the pencil 90 is inserted along the central axis a of the pencil sharpener 812, so that the propelling direction of the pencil 90 is not coaxial with the sliding direction of the push block 83 and forms an angle θ (90 ° < θ <180 °), and therefore, when the pencil 90 pushes the pushing block 83, as shown in fig. 13, a component parallel to the sliding direction and a component perpendicular to the sliding direction are generated, which on one hand reduces the force pushing the pushing block 83 (only the component parallel to the sliding direction has the force pushing the pushing block 83), and on the other hand, the component perpendicular to the sliding direction provides a positive force of the pushing block 83 acting on the sliding way 813, further, the friction force acting on the push block 83 by the inner side wall of the slide 813 is increased, so that the friction condition is more serious.

The resistance causes the user to push the pencil 90 with a greater force to trigger the prompt button 82 to disengage from the snap position to generate the bounce prompt effect, however, the pen point 91 is easily broken or damaged, which causes the user to continue sharpening the pencil, resulting in poor sharpening prompt function and excessive sharpening of the pencil 90, and in conclusion, the conventional pencil sharpener 80 has a certain place to be improved.

Disclosure of Invention

In order to solve the problems of large resistance, poor sharpening prompting function and easy excessive sharpening of the existing pencil sharpener, the invention provides the pencil sharpener capable of prompting sharpening, which effectively improves the problems and is further described as follows.

The invention relates to a pencil sharpener capable of prompting sharpening, which comprises:

the base is provided with an accommodating groove and a buckle structure;

the prompting button can be movably arranged in the accommodating groove of the base and is provided with an actuating unit and an elastic arm, the actuating unit is arranged between the prompting button and the accommodating groove, and the elastic arm can be buckled with the buckle structure to enable the prompting button to be positioned at a locking position;

the pencil sharpening seat is arranged on the base, a conical groove is formed in the pencil sharpening seat, the conical groove is provided with a central axis, and a wide part and a narrow part are respectively formed at two ends of the conical groove, so that a pencil can be sharpened in the conical groove; and

a trigger piece, the trigger piece can be located with swinging cut the pen stand with the suggestion button between the elastic arm, the trigger piece include one lean on face, a pin joint portion and one connect the actuator part of pin joint portion, just the actuator part supply support lean on in the suggestion button the elastic arm, when the one end of this pencil in sharpen the back in the bell jar, can support and lean on the face messenger of leaning on the trigger piece swing, and then promote the elastic arm breaks away from buckle structure, and triggers the actuator unit motion makes the suggestion button break away from latched position.

The invention abandons the existing sliding sharpening prompting structure, and through the technical characteristics, when the pencil sharpener with the prompting function is used, in the swinging process of the trigger piece, the friction force which can obstruct the propelling of the pencil can not be generated by the contact with the slide way as the existing sliding sharpening prompting structure, and the propelling force provided by the pencil can be effectively applied to the abutting surface of the trigger piece, so that the swinging of the trigger piece can generate better unlocking effect, and the problem of invalid component force in the prior art can be solved.

Drawings

FIG. 1 is a perspective partial cross-sectional view of a first preferred embodiment of the present invention;

FIG. 2 is another perspective partial cross-sectional view of the first preferred embodiment of the present invention;

FIG. 3 is an exploded perspective view of the first embodiment of the present invention;

FIG. 3A is an exploded perspective view of a pencil sharpener base according to a second embodiment of the present invention;

FIG. 4 is a side sectional view of the first preferred embodiment of the present invention;

FIG. 4A is an enlarged view of a portion of FIG. 4A at the point of reference 4A;

FIG. 4B is an enlarged view of a portion of FIG. 4B at the location marked 4B;

FIG. 5 is a top sectional view of the first preferred embodiment of the present invention;

FIG. 6 is a perspective view of the indication button and the pencil sharpener of the first preferred embodiment of the present invention;

FIGS. 7 and 8 are side sectional views of the first preferred embodiment of the present invention;

FIG. 9 is a schematic sectional side view of the first preferred embodiment of the present invention showing the movement of the elastic arm;

FIG. 10 is a side view of the trigger of the first preferred embodiment of the present invention;

fig. 10A and 10B are schematic diagrams illustrating a relationship between the size of the pivoting portion of the trigger member and the unlocking effect;

FIGS. 10C and 10D are schematic views of the relationship between the size of the actuating portion of the trigger member and the unlocking effect;

FIG. 11 is a side sectional view of a second preferred embodiment of the present invention;

FIG. 12 is a side sectional view of a prior art sharpener;

FIG. 13 is an enlarged, partial, side cross-sectional view of a push block for pushing a prior art sharpener after sharpening a pencil.

Detailed Description

The technical means adopted by the invention to achieve the preset purpose are further described below by combining the accompanying drawings and the preferred embodiments of the invention.

The present invention is a pencil sharpener capable of prompting sharpening, and the first preferred embodiment thereof is shown in fig. 1 to 3, and comprises a base 10, a prompting button 20, a pencil sharpening base 30 and a trigger 40.

In a first preferred embodiment of the present invention, the base 10 is a substantially cylindrical housing, the base 10 forms an accommodating space 13 therein, and as shown in fig. 1 to 3, the base 10 includes a base 102, an accommodating groove 11, a fastening structure 12 and a cover 14 connected to the base 102, a bottom end of the base 102 is closed to form the accommodating space 13, the accommodating space 13 can collect pen waste generated during the pen cutting process, the top end of the base 102 is provided with at least one fastening portion 103, the accommodating groove 11 is formed by recessing from a position near the bottom of the outer surface of the base 102 and communicates with the accommodating space 13, the fastening structure 12 is disposed in the accommodating space 13, the cover 14 is provided with at least one fastening portion 140, so that the base 102 and the cover 14 can be fastened to each other through the fastening portion 103 and the fastening portion 140 as shown in fig. 1, in a first preferred embodiment of the present invention, as shown in fig. 3, the cover 14 is composed of two half shells, and the cover 14 has two fastening portions 140 (the base 102 is correspondingly provided with two fastening portions 103), the two fastening portions 140 are respectively disposed on the two half shells, the two half shells are respectively provided with at least one combining portion, and the combining portions of the two half shells can be a protruding pillar 142A and a groove 142B respectively, so that the two half shells can be connected through the protruding pillar and the groove, and further, the two fastening portions 140 of the cover 14 are fastened with the two fastening portions 103 of the base 102, so that the cover 14 is connected with the base 102.

As shown in fig. 1 to 4, the indication button 20 can be movably disposed in the accommodating groove 11 of the base 10, and is provided with an actuating unit 201 and an elastic arm 21, the actuating unit 201 is disposed between the indication button 20 and the accommodating groove 11, and the elastic arm 21 can be buckled with the buckle structure 12, so that the indication button 20 is positioned at a locking position as shown in fig. 4, wherein the actuating unit 201 can move the indication button 20 in a direction away from the locking position, and further when the elastic arm 21 is away from the buckle structure 12, the indication button 20 moves relative to the base 10 and extends out of the accommodating groove 11, so as to provide an indication effect.

In a first preferred embodiment of the present invention, as shown in fig. 3 and 4, the indication button 20 includes a base 202 located in the accommodating cavity 11, and the elastic arm 21 extends from the base 202 in a direction away from the opening of the accommodating cavity 11 and extends into the accommodating space 13, a user presses the base 202 to move the indication button 20 toward the accommodating cavity 11, and after the indication button 20 is pressed, the elastic arm 21 can be buckled with the buckling structure 12, the buckling structure 12 includes a buckling protrusion 121, the buckling protrusion 121 protrudes from one side of the accommodating cavity 11 toward the elastic arm 21, and the elastic arm 21 has a buckling hole 211, so that the elastic arm 21 is buckled with the buckling protrusion 121 through the buckling hole 211.

As shown in fig. 4, a pivot point F is formed at the connection between the elastic arm 21 and the base 202, and the elastic arm 21 can swing relative to the pivot point F, so as to disengage from the fastening structure 12; further, the actuating unit 201 is a compression spring, so that when the elastic arm 21 is separated from the fastening structure 12, the prompt button 20 is pushed out of the accommodating groove 11; in other embodiments, the locking structure 12 may be a locking hole or a locking groove, the elastic arm 21 may be provided with a locking block locked with the locking hole or the locking groove, and the actuating unit 201 may be a spring.

Still further, please refer to fig. 4, the accommodating groove 11 may further be provided with at least one limiting channel 111 communicating with the accommodating space 13, and the prompt button 20 is correspondingly provided with at least one guiding arm 22, the at least one guiding arm 22 and the elastic arm 21 are arranged at an interval, the shape of the at least one guiding arm 22 matches with the shape of the at least one limiting channel 111, and the at least one guiding arm 22 passes through the at least one limiting channel 111 and extends into the accommodating space 13, so that when the prompt button 20 moves relative to the accommodating groove 11, the movement between the at least one guiding arm 22 and the at least one limiting channel 111 provides a guiding effect, and the prompt button 20 is limited from moving linearly in the accommodating groove 11 stably without deflection or shaking.

As shown in fig. 3 and 4, the pencil sharpening base 30 is connected to the base 10, and a tapered groove 31 is formed inside the pencil sharpening base 30 for sharpening a pencil 90 in the tapered groove 31, a wide portion and a narrow portion are respectively formed at two ends of the tapered groove 31, taking the direction shown in fig. 4 as an example, the wide portion is located at the top end of the tapered groove 31, the narrow portion is located at the bottom end of the tapered groove 31, and the tapered groove 31 has a sharpening preset point 311 and a central axis a ', and the sharpening preset point 311 is the position of the pencil point of the pencil 90 after sharpening, and the central axis a' passes through the sharpening preset point 311; in the first preferred embodiment of the present invention, the pencil sharpener 30 is located in the accommodating space 13, so that the pencil shavings generated by the sharpening fall into the accommodating space 13 of the base 102, the pencil sharpener 30 includes a sharpener seat 32 and a blade 33, the sharpener seat 32 is connected to the base 10 and clamped between the two half shells of the cover 14, the blade 33 is fixed on the sharpener seat 32, and the blade 33 and the sharpener seat 32 together form the tapered slot 31.

Further, as shown in fig. 3, 5 and 6, the cap 14 of the base 10 is connected to the holder 32 of the pencil sharpening seat 30 through a ratchet structure, the ratchet structure includes a plurality of ratchets 141 and a plurality of pawls 322, wherein the plurality of ratchets 141 are disposed on the inner periphery of the base 10 (distributed on the two half shells of the cap 14), the plurality of pawls 322 are protruded on the outer periphery of the holder 32 of the pencil sharpening seat 30, and each pawl 322 is correspondingly engaged with one of the ratchets 141.

Still further, the tool seat 32 can be seen from fig. 3 and 4, and includes a body 34 and a blade seat 35, wherein the body 34 is connected to the base 10 and clamped between the two half shells of the cover 14, the outer periphery of the body 34 is convexly provided with the detent 322, the blade seat 35 is fastened to the body 34, the blade 33 is fixed on the blade seat 35, and the blade 33 and the blade seat 35 jointly form the tapered slot 31.

As shown in fig. 4, 7, 8 and 10, the trigger 40 can be swingably disposed between the narrow portion of the tapered slot 31 of the pencil sharpener 30 and the elastic arm 21 of the indication button 20, the trigger 40 has an abutting surface 401, a pivoting portion 41 and an actuating portion 42, the abutting surface 401 is disposed at a position of the trigger 40 facing the narrow portion of the tapered slot 31, the pivoting portion 41 is pivotally connected to the pencil sharpener 30 or the base 10, and the actuating portion 42 is abutted against the elastic arm 21 of the indication button 20, so that when one end of the pencil 90 is sharpened in the tapered slot 31, the abutting surface 401 can be abutted to swing the trigger 40, thereby pushing the elastic arm 21 to disengage from the fastening structure 12, and triggering the actuating unit 201 to move, so as to disengage the indication button 20 from the locking position; preferably, the abutting surface 401 is perpendicular to the central axis a', so that the pushing force provided by the pencil 90 can be vertically and completely applied to the abutting surface 401 of the triggering member 40, and further the pushing force of the pencil 90 can be completely utilized, so that the triggering member 40 can generate the best swinging effect.

Further, as shown in fig. 4, fig. 7 and fig. 8, in the first preferred embodiment of the present invention, the body 34 of the tool holder 32 is provided with a pivot unit, preferably, the pivot unit is a pivot 321, and the pivot portion 41 of the trigger 40 has a claw portion, so that the claw portion of the pivot portion 41 of the trigger 40 is sleeved on the pivot 321 of the body 34, and further the trigger 40 can swing relative to the pivot 321, the actuating portion 42 is connected to the pivot portion 41 and extends from one end of the pivot portion 41 away from the pivot 321, in the preferred embodiment, the pivot portion 41 and the actuating portion 42 are both arm-shaped and perpendicular to each other to form an L shape, and the actuating portion 42 abuts against the elastic arm 21 of the indication button 20.

In addition, the body 34 and the blade seat 35 of the tool holder 32 can also be integrally formed as shown in fig. 3A, and the tool holder 32 is provided with a pivot seat 36, the pivot seat 36 is connected to the integrally formed member, the pivot seat 36 is provided with a pivot 361, so that the trigger 40 is pivotally connected to the pivot seat 36 and can swing relative to the pivot 361. The triggering member 40 can be movably pivoted to the tool holder 32 by other means, for example, the pivoting portion 41 of the triggering member 40 forms a closed hole, and two sides of the tool holder 32 corresponding to the closed hole respectively form a pin, so that the triggering member 40 is pivoted to the tool holder 32 by the two pins to rotate relative to the tool holder 32.

When the user rotates the pencil 90 to sharpen the pencil 90 to a predetermined sharpness by planing the blade 33, the tip of the pencil 90 reaches the position of the sharpening presetting point 311 and pushes against the trigger 40, so that the trigger 40 swings relative to the pivot 321 and further pushes against the elastic arm 21, so that the elastic arm 21 deforms toward the bottom of the base 10 as shown in fig. 7, at this time, the fastening hole 211 is separated from the fastening structure 12 of the base 10, the prompt button 20 is popped out along the accommodating groove 11 under the action of the actuating unit 201, and the user can know that the pencil 90 has been sharpened and can stop planing.

Preferably, as shown in fig. 4, 4A and 4B, when the trigger 40 swings, the shaved pen dust may fall into the open space formed between the tool holder 32 and the trigger 40 after swinging, therefore, a blocking piece 324 is disposed at the bottom of the tool holder 32, the blocking piece 324 extends towards the trigger 40 and exceeds the abutting surface 401, and the length L1 of the blocking piece 324 extending beyond the abutting surface 401 is greater than or equal to the length L2 of the overlapping of the locking protrusion 121 and the locking hole 35211 (i.e. L1 is greater than or equal to L2), so that during the swinging of the trigger 40, the blocking piece 324 can provide a stopping function to prevent the pen dust from falling into the open space formed between the tool holder 32 and the trigger 40 after swinging.

Further, in the first preferred embodiment of the present invention, the elastic arm 21 is provided with a positioning shoulder 212, and when the indication button 20 is popped out, the positioning shoulder 212 abuts against the fastening structure 12 of the base 10, so as to prevent the indication button 20 from falling off from the accommodating groove 11.

After the user draws out the pencil 90, since the elastic arm 21 has elasticity and loses the force pushed downward, it will return to the initial state and position shown in fig. 8, and push the trigger 40 back toward the tapered slot 31, so as to be convenient for the user to use again; preferably, in order to avoid the problem that the unlocking sensitivity between the elastic arm 21 and the latch structure 12 is too high, i.e. to avoid the problem that the indication button 20 is ejected when the trigger 40 is touched by mistake or the pencil sharpener is shaken, but is not ejected and pointed after the pencil 90 is sharpened, thereby causing an error indication, as shown in fig. 9, in the first preferred embodiment of the present invention, the distance between the position where the actuating portion 42 of the trigger 40 abuts against the elastic arm 21 and the fulcrum F is greater than the distance between the abutting position of the latch protrusion 121 and the latch hole 211 and the fulcrum F, so that the trigger 40 pushes the displacement stroke L3 of the elastic arm 21 downwards by shaking, which is greater than the overlapping length L2 of the latch protrusion 121 and the latch hole 211 (i.e. L3> L2), so as to enable the latch hole 211 to move downwards by the overlapping length L2 and disengage from the latch protrusion 121, therefore, the displacement stroke of the trigger 40 perpendicular to the elastic arm 21 is greater than the trip unlocking stroke of the elastic arm 21, so that the unlocking sensitivity is prevented from being too high, and the effect of more accurately unlocking is achieved.

Still further, as shown in fig. 7, in the first preferred embodiment of the present invention, a side of the trigger 40 away from the pivot 321 may be provided with a limit flange 402 facing the blade 33, and after the trigger 40 swings, the limit flange 402 will abut against the blade 33 as shown in fig. 7; the limiting flange 402 provides a limiting effect on the swinging of the trigger 40, thereby preventing the trigger 40 from swinging excessively, which may result in failure to reset or breakage of the stress concentration portion of the component.

In the above operation process, since the trigger 40 is not in contact with the components other than the elastic arm 21 except the pivot joint during the swinging process, and the propelling force of the pencil 90 can be directly transmitted to cause the swinging of the trigger 40, the problems of conventional friction and ineffective component force can be solved, so that compared with the prior art, the present invention has the effect of more labor saving and more accurate trigger prompt during the use process.

Further describing the length ratio of the pivot portion 41 and the actuating portion 42 of the trigger 40, as shown in fig. 8 and 10, the shape of the trigger 40 is L-shaped, wherein the pivot axis of the trigger 40 is defined as a point B, the connecting point of the pivot portion 41 and the actuating portion 42 is defined as a point C, and one end of the actuating portion 42 abutting against the elastic arm 21 is defined as a point D, wherein a connecting line of B, C two points forms a horizontal segment BC, a connecting line of C and D two points forms a vertical segment CD, the central axis a ' of the tapered slot 31 passes through a connecting line of C, D two points, such that a connecting line of B, C, D three points can be regarded as a right triangle, i.e. the pivot portion 41 has a length extending from the point B to the central axis a ', the length is a horizontal segment BC, the actuating portion 42 has a length extending along the central axis a ', the length is a vertical segment CD, the lengths of the horizontal section BC and the vertical section CD are preferably between 1mm and 50mm respectively (namely BC is more than or equal to 1mm and less than or equal to 50mm, CD is more than or equal to 1mm and less than or equal to 50 mm); further, in the first preferred embodiment of the present invention, when the horizontal segment BC is between 3.5mm and 7.5mm and the vertical segment CD is between 4mm and 14mm (i.e. 3.5mm ≦ BC ≦ 7.5mm, 4mm ≦ CD ≦ 14mm), the triggering member 40 has a better effect of triggering the prompt, for example, the length of the horizontal segment BC is 5.5 mm and the length of the vertical segment CD is 9 mm. The position of the abutting surface 401 is adjusted according to the preset sharpening point 311, and may fall at the point C, or be higher or lower than the point C.

As shown in fig. 10A and 10B, when the length of the vertical section CD is fixed and the swing amplitude of the elastic arm 21 sufficient for unlocking is not changed, in other words, the downward vertical displacement of the point D is equal, the influence of the change in length of the horizontal section BC on the unlocking triggering is compared, as shown in fig. 10A, when the length of the horizontal section BC is too short, the triggering member 40 must swing with a large amplitude to enable the elastic arm 21 to generate the swing amplitude sufficient for unlocking, the horizontal stroke of the point D is too large, and when the horizontal stroke of the point D is too large, the actuating portion 42 of the triggering member 40 is difficult to push against the central region of the elastic arm 21, and therefore, the length of the horizontal section BC is too short, which easily causes the prompt button 20 to be unlocked and fail; on the other hand, as shown in fig. 10B, when the length of the horizontal segment BC is too long, under the condition that the trigger 40 swings at a small angle, the swing amplitude of the elastic arm 21 reaches the downward vertical displacement of the point D sufficient for releasing and unlocking, so that the prompt button 20 is too sensitive, and the prompt button 20 may jump out by slightly shaking the base 10 during the use of the pencil sharpener, which does not meet the use requirement of sharpening prompt.

Referring to fig. 10C and 10D, under the condition that the length of the horizontal segment BC is fixed and the swing amplitude of the elastic arm 21 sufficient for releasing and unlocking is kept unchanged, the influence of the length change of the vertical segment CD on the use is compared, wherein the swing angle of the trigger 40 in fig. 10C is smaller than that in fig. 10D, as shown in fig. 10C, when the length of the vertical segment CD is too short, the trigger 40 swings at a small angle and unlocks, so that the cueing button 20 is too sensitive; as shown in fig. 10D, when the length of the vertical segment CD is too long, the horizontal stroke of the point D is too large, similar to the situation of fig. 10A, the point D cannot be pushed against the central area of the elastic arm 21, the pushing effect is not good, and the prompt button 20 is easily unlocked and fails.

Fig. 11 is a second preferred embodiment of the present invention, which is similar to the first preferred embodiment in structure, and the main difference is: the inner wall of the base 10 is convexly provided with a pivot unit 101, the pivot unit 101 is formed inside the base 102 at a side away from the accommodating groove 11, a through hole 321A is formed through a side of the body 34 of the tool holder 32 away from the blade 33, one end of the pivot portion 41 of the trigger 40 passes through the through hole 321A from inside to outside and is pivoted with the pivot unit 101 of the base 10 to enable the trigger 40 to swing relative to the pivot unit 101 of the base 10, the pivot portion 41 of the trigger 40 and the actuating portion 42 are L-shaped, and a movement manner of the trigger 40 to trigger the prompt button 20 is similar to that of the first preferred embodiment, which is not described herein again.

Through the technical characteristics, when the pencil sharpener of the present invention is used, in the process of swinging the trigger 40, the friction force which can obstruct the propelling of the pencil 90 can not be generated due to the contact with the slide 813 as in the existing sliding sharpening prompting structure, and the thrust provided by the pencil 90 can be directly transmitted to cause the swinging of the trigger 40, so as to avoid invalid component force, in addition, the thrust of the pencil 90 can be fully utilized, so that a user does not need to strongly push the pencil 90, thereby not easily causing the problem of the breakage of the sharpened pen point in the pushing process, and effectively avoiding excessive sharpening.

Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.