CN110370839B

CN110370839B - Propelling pencil with automatic core rotating function

Info

Publication number: CN110370839B
Application number: CN201910654561.6A
Authority: CN
Inventors: 韩爱国; 郭礼庚; 程小青
Original assignee: Wenzhou Tianjiao Pen Industrial Co ltd
Current assignee: Wenzhou Tianjiao Pen Industrial Co ltd
Priority date: 2019-07-19
Filing date: 2019-07-19
Publication date: 2022-04-19
Anticipated expiration: 2039-07-19
Also published as: CN110370839A

Abstract

The invention relates to an automatic pencil with automatic lead-rotating function, which comprises a penholder component and a pencil lead component arranged in the penholder component, wherein the pencil lead component is connected with a rotating body in a circumferential linkage manner, a holding sleeve for holding by a hand during writing is arranged outside the penholder component, the holding sleeve can axially move in a certain range relative to the penholder component, a driving mechanism is arranged between the holding sleeve and the rotating body, and the driving mechanism converts the axial reciprocating motion of the holding sleeve into the rotating motion of the rotating body and transmits the rotating motion to the pencil lead component to rotate a pencil lead. Compared with the prior art, the propelling pencil of the invention has the advantages that the driving part for driving the rotating body to rotate is transferred to the holding sleeve, so that the pencil lead does not need to stretch and move on the pencil holder assembly, and the writing is smoother.

Description

Propelling pencil with automatic core rotating function

Technical Field

The invention relates to a mechanical pencil with an automatic core rotating function.

Background

When writing with a mechanical pencil, people are often used to hold the pencil shaft obliquely. Therefore, under the condition that the penholder does not rotate, the front end of the pen core can be ground into an inclined plane, so that the writing marks become thicker gradually. Meanwhile, the density of the pen mark is changed from the density due to the change of the pressure. Furthermore, as writing continues, the edges of the markings become less sharp. In order to write uniform and beautiful pen marks, people need to continuously rotate the pen holder, which is inconvenient.

In order to solve the above problems, chinese patent CN101460314A is an improvement on the conventional mechanical pencil, in which a rotating body with upper and lower cam surfaces is arranged in the pencil holder assembly, and a corresponding fixed cam surface is arranged at the position opposite to the upper and lower cam surfaces, the rotating body can move between the upper and lower fixed cam surfaces, and the engaging positions of the upper and lower cam surfaces of the rotating body and the upper and lower fixed cam surfaces are staggered by half phase, and the rotating body is fixedly connected to the clamping component in the pencil lead assembly.

Thus, when writing, the rotary body moves back and forth between the upper and lower fixed cam surfaces in accordance with the application and release of writing pressure applied to the pen core, and is engaged with the upper and lower fixed cam surfaces alternately in sequence. Because the engaging positions of the upper cam surface and the lower cam surface of the rotating body and the upper fixed cam surface and the lower fixed cam surface are staggered by half phase, the rotating body rotates in the process that the rotating body moves back and forth and is alternately engaged, and the clamping component and the pen core are driven to rotate. The principle of the automatic rotation of the rotating body is described in detail in the above-mentioned document.

The propelling pencil of above-mentioned structure is when writing, and the refill subassembly can be for the continuous axial telescopic movement of pen-holder subassembly, and especially when the rise of writing and the pen that falls, the flexible refill subassembly can make the refill when writing have the action of an adhesion, leads to the fact unsmoothly to writing. Moreover, the head of the front end of the pen core moves during writing, and the position of pen falling cannot be accurately controlled.

Disclosure of Invention

The present invention has been made to overcome the above-mentioned drawbacks of the prior art, and an object of the present invention is to provide a mechanical pencil in which a lead is automatically rotated when writing, and an axial position between a lead assembly and a holder assembly is relatively fixed when writing.

The pen comprises a pen holder assembly and a pen core assembly arranged in the pen holder assembly, and the pen core assembly is characterized in that the pen core assembly is connected with a rotating body in a circumferential linkage manner, a holding sleeve for holding by a hand during writing is arranged outside the pen holder assembly, the holding sleeve can axially move in a certain range relative to the pen holder assembly, a driving mechanism is arranged between the holding sleeve and the rotating body, and the driving mechanism converts the axial reciprocating motion of the holding sleeve into the rotating motion of the rotating body and transmits the rotating motion to the pen core assembly to rotate the pen core.

Compared with the prior art, the structure enables the driving part for driving the rotating body to rotate to be transferred to the holding sleeve, so that the pen core does not need to stretch and move on the pen holder assembly, and the writing is smoother. The pencil lead rotates to enable writing handwriting to be fine and uniform all the time and not to become thick, and the writing written by using the pencil lead with the same specification is thinner than that written by using a common pencil, so that the effect of writing by using the thinner pencil lead is achieved on the basis of ensuring the strength of the pencil lead.

The driving mechanism comprises an upper cam surface and a lower cam surface which are arranged on the upper surface and the lower surface of a rotating body, corresponding upper movable cam surfaces and corresponding lower movable cam surfaces are respectively arranged at positions opposite to the upper cam surfaces and the lower cam surfaces, the meshing positions of the upper cam surfaces and the lower cam surfaces of the rotating body and the upper movable cam surfaces and the lower movable cam surfaces are staggered by less than one phase, the rotating body is arranged between the upper movable cam surfaces and the lower movable cam surfaces, the upper movable cam surfaces and the lower movable cam surfaces are in linkage connection with the grip sleeve, and the upper movable cam surfaces and the lower movable cam surfaces of the rotating body are alternately meshed with the upper cam surfaces and the lower cam surfaces of the rotating body along with the axial movement of the grip sleeve.

The upper end surface of the rotating body is provided with an upper cam surface, the upper cam surface corresponds to the upper movable cam surface, and the upper movable cam surface is arranged on the upper movable cam body; the lower end face of the rotating body is provided with a lower cam face which corresponds to the lower movable cam face, and the lower movable cam face is arranged on the lower movable cam body.

The further technical solution of the invention is as follows: the upper movable cam body and the lower movable cam body are fixedly connected into an integral structure through the connecting pin to form a movable gear sleeve, so that the rotating body is accommodated between the upper movable cam body and the lower movable cam body and has a certain gap, and the holding sleeve is in linkage connection with the movable gear sleeve.

The further technical solution of the invention is as follows: a convex block and an abutting surface which are abutted against each other are arranged between the holding sleeve and the movable gear sleeve, so that the movable gear sleeve is pushed by the matching of the convex block and the abutting surface to move downwards when writing pressure is applied to the holding sleeve; in addition, a return mechanism is provided which acts on the movable sleeve or its linkage and which moves the movable sleeve and the grip sleeve upwardly, the return mechanism moving the movable sleeve and the grip sleeve upwardly when the writing pressure on the grip sleeve is released.

The further technical solution of the invention is as follows: the upper movable cam body and the lower movable cam body are respectively connected with the holding sleeve in a linkage way.

The further technical solution of the invention is as follows: a lug and an abutting surface which are abutted against each other are respectively arranged between the axial positions of the upper movable cam body and the lower movable cam body on the grip sleeve, which correspond to the upper movable cam body and the lower movable cam body, and the upper movable cam body and the lower movable cam body; in addition, a reset mechanism is provided, which enables the upper movable cam body, the lower movable cam body and the grip sleeve to move upwards.

Aiming at the upper and lower movable cam bodies with an integrated structure, the invention adopts the further technical scheme that: the movable cam body at one end is set into a discontinuous split form, each split part is fixedly connected with different connecting feet, and meanwhile, the whole movable gear sleeve or the connecting foot part on the movable gear sleeve is made of a material with certain elasticity.

Aiming at the upper and lower movable cam bodies with an integrated structure, the invention adopts the further technical scheme that: the movable cam body at one end and the connecting foot are arranged into a buckling structure.

The further technical solution of the invention is as follows: the number of the connecting pins is two, and the two connecting pins are respectively positioned at symmetrical positions outside the rotating body.

Drawings

The invention is further illustrated by the following examples in conjunction with the accompanying drawings:

FIG. 1: the overall appearance of the embodiment is schematically shown;

FIG. 2: a partial structure diagram of the first embodiment;

FIG. 3: view A-A of FIG. 2;

FIG. 4: a partial structural schematic diagram of the second embodiment;

FIG. 5: a schematic structural view of a rotor portion according to the first embodiment;

FIG. 6: FIG. 5 is a cross-sectional view of the movable sleeve;

FIG. 7: a schematic structural view of a rotor part according to the second embodiment;

FIG. 8: the working state of the cam surface between the rotating body and the corresponding movable cam body is I;

FIG. 9: the working state of the cam surface between the rotating body and the corresponding movable cam body is II;

FIG. 10: the working state of the cam surface between the rotating body and the corresponding movable cam body is three;

FIG. 11: the working state of the cam surface between the rotating body and the corresponding movable cam body is four;

FIG. 12: the working state of the cam surface between the rotating body and the corresponding movable cam body is five;

FIG. 13: a partial structure schematic diagram of the penholder assembly;

FIG. 14: FIG. 13 is a side view;

FIG. 15: the structure of the grip sleeve locking mechanism is partially removed.

Detailed Description

As shown in the figure, the pen comprises a pen holder component 1 and a pen refill component 2 arranged in the pen holder component 1, the pen refill component 2 is connected with a rotating body 3 in a circumferential linkage mode, a holding sleeve 4 which is used for being held by a hand when writing is arranged outside the pen holder component 1, the holding sleeve 4 can axially move in a certain range relative to the pen holder component 1, a driving mechanism is arranged between the holding sleeve 4 and the rotating body 3, and the driving mechanism converts the axial reciprocating motion of the holding sleeve 4 into the rotating motion of the rotating body 3 and transmits the rotating motion to the pen refill component 2 to enable the pen refill to rotate.

After the refill component 2 is linked with the rotating body 3 in a circumferential direction in a linkage manner, the refill component 2 and the rotating body 3 can be fixedly connected in the axial direction; the axial direction of the pencil lead assembly 2 and the axial direction of the rotating body 3 can be in relative sliding connection, and in the connection mode, the relative position of the pencil lead assembly 2 and the rotating body 3 is flexible, so that the installation position of other parts in the pencil can be more flexible.

The driving mechanism comprises an upper cam surface 3a and a lower cam surface 3b which are arranged on the upper surface and the lower surface of a rotating body 3, an upper movable cam surface 5a and a lower movable cam surface 6a which are respectively arranged at the positions opposite to the upper cam surface 3a and the lower cam surface 3b, the engaging positions of the upper cam surface 3a and the lower cam surface 3b of the rotating body and the upper movable cam surface 5a and the lower cam surface 6a are staggered by less than one phase, the rotating body 3 is arranged between the upper movable cam surface 5a and the lower movable cam surface 6a, the upper movable cam surface 5a and the lower movable cam surface 6a are in linkage connection with a holding sleeve 4, and the upper movable cam surface 5a and the lower movable cam surface 6a are alternately engaged with the upper cam surface 3a and the lower cam surface 3b of the rotating body along with the axial movement of the holding sleeve 4.

Provided on the upper end face of the rotary body 3 is an upper cam face 3a, the upper cam face 3a corresponding to the upper movable cam face 5a, the upper movable cam face 5a being provided on the upper movable cam body 5; provided on the lower end surface of the rotary body 3 is a lower cam surface 3b, the lower cam surface 3b corresponding to a lower movable cam surface 6a, and the lower movable cam surface 6a provided on the lower movable cam body 6.

When the upper cam faces 3a are in contact with the upper movable cam faces 5a, the lower cam faces 3b and the lower movable cam faces 6a are separated from each other without interfering with each other; when the lower cam surface 3b is in contact with the lower movable cam surface 6a, the upper cam surface 3a and the upper movable cam surface 5a are separated from each other without interfering with each other.

In the first embodiment, in order to realize the arrangement of the cam surfaces alternately engaged with each other, the upper movable cam body 5 and the lower movable cam body 6 are fixedly connected into an integral structure through the connecting leg 7, the movable gear sleeve 10 is formed, the rotating body 3 is accommodated between the upper movable cam body 5 and the lower movable cam body 6 with a certain gap, and the grip 4 is linked with the movable gear sleeve 10. In this configuration, the upper movable cam surface 5a and the lower movable cam surface 6a can be moved together in synchronization by driving the movable sleeve 10. The specific structure can be as follows: a convex block 41 extending into the penholder component 1 is arranged on the holding sleeve 4, and the convex block 41 is abutted against the movable gear sleeve 10, so that the movable gear sleeve 10 is pushed by the convex block 41 to enable the movable gear sleeve 10 to move downwards when writing pressure is applied to the holding sleeve 4; in addition, a return mechanism is provided which acts on the movable sleeve 10 or on its linkage and which moves the movable sleeve 10 and the grip sleeve 4 upwards, and which moves the movable sleeve 10 and the grip sleeve 4 upwards when the writing pressure on the grip sleeve 4 is released.

In the second embodiment, in order to realize the arrangement of the cam surfaces which are alternately engaged with each other, the upper movable cam body 5 and the lower movable cam body 6 are respectively linked with the grip sleeve 4. The specific structure can be as follows: an upper convex block 41' and a lower convex block 41 which extend into the penholder component 1 are arranged at different axial positions on the holding sleeve 4, the upper convex block 41' is abutted against the upper movable cam body 5, and the lower convex block 41' is abutted against the lower movable cam body 6; in addition, a reset mechanism is provided which moves the upper movable cam body 5, the lower movable cam body 6 and the grip sleeve 4 upward. In this configuration, the upper movable cam body 5 and the lower movable cam body 6 are moved together by the grip sleeve 4.

Since there is a phase difference between the position of engagement of the upper movable cam surface 5a with the upper cam surface 3a and the position of engagement of the lower movable cam surface 6a with the lower cam surface 3b, there is a certain requirement for the relative position between the upper and lower

movable cam bodies

5, 6. In the first embodiment, the upper and lower

movable cam bodies

5 and 6 are integrally fixed to each other, and therefore the relative positions of the upper and lower

movable cam bodies

5 and 6 are relatively fixed. However, the upper and lower

movable cam bodies

5 and 6 are integrally fixed to each other, and there is a problem that when the rotary body 3 is to be mounted at the intermediate position in the axial direction of the upper and lower

movable cam bodies

5 and 6, the size of the rotary body 3 is larger than the size of the mounting space outside the movable sleeve 10 formed by integrally fixing the upper and lower

movable cam bodies

5 and 6 to each other.

Thus, for the first embodiment, at least the following two solutions are needed.

The first scheme is as follows: the movable cam body at one end is arranged in a discontinuous split form, and meanwhile, a certain elastic material is used for manufacturing the whole movable gear sleeve 10 or the connecting foot 7 part on the movable gear sleeve 10, so that the movable gear sleeve 10 can be opened from the discontinuous movable cam body at the end. During assembly, the rotor 3 is inserted into the middle of the movable gear sleeve 10 from the opened opening, and the opened cam body is returned to the state of being engaged with the rotor 3 by the elastic return of the connecting leg 7.

The discontinuous movable cam body in the scheme can be an upper movable cam body 5 or a lower movable cam body 6.

Since only a part of the cam surfaces are engaged, fewer engaging surfaces means that the requirement for the machining accuracy of the part of the movable cam body is higher.

Scheme II: the movable cam body at one end and the connecting foot 7 are arranged into a buckling structure. Thus, before being buckled with each other, one movable cam body is independent, the rotating body 3 can be conveniently placed in the half movable gear sleeve 10 with one end freely opened, and then the independent movable cam body is sealed at the opened end through the buckling structure, so that the closing of the upper end and the lower end of the rotating body 3 is completed.

In this embodiment, the movable cam body engaged with the connecting leg 7 may be the upper movable cam body 5, the lower movable cam body 6, or both the upper and lower

movable cam bodies

5 and 6 may be engaged with the connecting leg 7.

In this arrangement all cam surfaces are maintained in full continuity and therefore have better engagement accuracy. However, it is difficult to provide the snap-fit structure within a very small size range.

With each of the above embodiments and versions, the discontinuous cam surface or portions of the cam surface are more difficult to machine. The larger the area of contact between two mating cam surfaces, the more local manufacturing or assembly errors will be corrected by the rest. Thus, the more complete, the larger the cam surface the less demanding its manufacturing accuracy will be.

Next, the conversion process of the movement will be specifically described by describing the cam surface between the rotating body 3 and the movable cam body corresponding thereto.

As shown in the figure, the engagement surface formed between the upper cam surface 3a and the upper movable cam surface 5a is formed by a plurality of continuous upper undulation units, and the engagement surface formed between the lower cam surface 3b and the lower movable cam surface 6a is formed by a plurality of continuous lower undulation units. The shapes of the upper undulating means on the upper cam surface 3a and the upper movable cam surface 5a may be the same as or different from the shapes of the lower undulating means on the lower cam surface 3b and the lower movable cam surface 6a, but the phase angle occupied by the individual undulating means on the upper cam surface 3a and the upper movable cam surface 5a is the same as the phase angle occupied by the individual undulating means on the lower cam surface 3b and the lower movable cam surface 6 a.

The position of engagement between the upper cam surface 3a and the upper movable cam surface 5a and the position of engagement between the lower cam surface 3b and the lower movable cam surface 6a are shifted by less than one phase. That is, when the upper cam faces 3a and the upper movable cam faces 5a are completely engaged, the lower cam faces 3b and the lower movable cam faces 6a are not in the completely engaged position; when the lower cam surface 3b is fully engaged with the lower movable cam surface 6a, the upper cam surface 3a and the upper movable cam surface 5a are not in the fully engaged position.

Fig. 8 shows a state in which the upper and lower

movable cam bodies

5 and 6 are oriented upward, and in this state, the lower movable cam surface 6a completely engages with the lower cam surface 3b of the rotary body 3, and at this time, the upper movable cam surface 5a is spaced apart from the upper cam surface 3a of the rotary body 3 by a predetermined distance, and the upper movable cam surface 5a and the upper cam surface 3a are positioned at positions of incomplete engagement.

Fig. 9 shows that the upper and lower

movable cam bodies

5 and 6 move downward from the upper state, in which the lower movable cam surface 6a is separated from the lower cam surface 3b, the upper movable cam surface 5a is in contact with the upper cam surface 3a, and since the relative positions in the circumferential direction are not changed, the upper movable cam surface 5a and the upper cam surface 3a are still in the incomplete engagement position, and the undulation elements on the upper movable cam surface 5a have a state in which the slopes of the corresponding undulation elements on the upper cam surface 3a are in contact with each other.

Fig. 10 shows that as the upper and lower

movable cam bodies

5 and 6 continue to move downward from the state of the upper drawing, the slopes on the undulating units on the upper movable cam surface 5a exert pressure on the corresponding slopes on the undulating units on the upper cam surface 3a, so that the upper cam surface 3a is caused to shift circumferentially, that is, the rotary body 3 is caused to rotate circumferentially, and finally the upper movable cam surface 5a and the upper cam surface 3a are completely engaged. Meanwhile, the lower movable cam surface 6a is axially separated from the lower cam surface 3b of the rotary body 3 by a certain distance, and the lower movable cam surface 6a and the lower cam surface 3b are in a position of incomplete engagement.

Fig. 11 shows that the upper and lower

movable cam bodies

5 and 6 are moved upward from the upper state, in which the upper movable cam surface 5a is separated from the upper cam surface 3a, the lower movable cam surface 6a is in contact with the lower cam surface 3b, and since the relative positions in the circumferential direction are not changed, the cam surfaces on the lower movable cam surface 6a and the lower cam surface 3b are still at positions of incomplete engagement, and the undulating units on the lower movable cam surface 6a have an inclined surface which is in contact with the corresponding inclined surface on the undulating units on the lower cam surface 3 b.

Fig. 12 shows that as the upper and lower

movable cam bodies

5 and 6 continue to move upward from the upper view state, the inclined surfaces of the undulating means on the lower movable cam surface 6a exert pressure on the corresponding inclined surfaces of the undulating means on the lower cam surface 3b, so as to cause the lower cam surface 3b to shift circumferentially, i.e., cause the rotary body 3 to rotate circumferentially, and finally cause the lower movable cam surface 6a and the lower cam surface 3b to be completely engaged. Meanwhile, the upper movable cam surface 5a is axially separated from the upper cam surface 3a of the rotary body 3 by a certain distance, and the upper movable cam surface 5a and the upper cam surface 3a are in a position of incomplete engagement.

The positions of engagement between the upper cam surface 3a and the upper movable cam surface 5a and the positions of engagement between the lower cam surface 3b and the lower movable cam surface 6a are different from each other, and are in a fixed relationship with the shapes of the engagement surfaces of the upper and

lower cam surfaces

3a, 3 b. In general, a half-phase shift can be applied to most of the shapes of the meshing surfaces. However, more desirable conditions are: when the grip sleeve 4 is applied with force downwards to write, the rotating angle of the rotating body 3 is a little smaller, and when the grip sleeve 4 is released from the force, the rotating angle of the rotating body 3 is a little larger, so that the rotation of the pen core can be completed as much as possible in the process of lifting the pen, and the writing cannot be influenced too much when the pen is dropped to write.

To achieve the above effect, when the lower cam surface 3b is completely engaged with the lower movable cam surface 6a, the engagement position differs from the engagement position of the upper cam surface 3a with the upper movable cam surface 5a by less than half a phase. That is, when the lower cam surface 3b and the lower movable cam surface 6a are completely engaged, the relative position of the rotor 3 and the upper cam surface 3a needs to be rotated to a position where the upper cam surface 3a and the upper movable cam surface 5a are completely engaged and the rotor 3 is rotated by less than half a phase. Accordingly, when the upper cam surfaces 3a and the upper movable cam surfaces 5a are completely engaged, the relative positions of the rotary body 3 and the lower cam surfaces 3b need to be rotated to a position where the lower cam surfaces 3b and the lower movable cam surfaces 6a are completely engaged, and the rotary body 3 needs to be rotated more than a half phase.

The basic principle of the engagement and rotation between the upper cam surface 3a and the lower cam surface 3b of the rotating body 3 and the upper movable cam surface 5a and the lower movable cam surface 6a, and the conversion of the axial movement into the circumferential rotation is also described in detail in chinese patent CN 101460314A. However, unlike this document, in which the intermediate rotating body is axially moved, in the present invention, the upper movable cam surface and the lower movable cam surface are axially moved on both sides of the rotating body.

In a first aspect of the first embodiment. The number of the connecting feet 7 is two, and the two connecting feet are respectively positioned at the symmetrical positions outside the rotating body 3. The upper movable cam body 5 is a continuous circular ring, the lower movable cam body 6 is a discontinuous circular ring part, the number of the lower movable cam bodies 6 is two corresponding to the two connecting feet 7, the lower movable cam bodies are respectively fixedly connected with the connecting feet 7, and the width of the lower movable cam bodies is the same as that of the connecting feet 7. In the present invention, the number of the connecting pins 7 is not limited to two, and may be one or more. The engagement of the rotating body 3 with the upper and lower

movable cam bodies

5, 6 is not reliable only when the connecting leg 7 is one. When there are a plurality of connecting legs 7, it becomes difficult to fit the rotating body 3 into the space between the upper and lower

movable cam bodies

5, 6.

The reset mechanism can be a reset spring or other reset structures. The reset mechanism can act on the movable gear sleeve 10 or the upper and lower

movable cam bodies

5 and 6, and can also act on a part fixedly connected with or abutted against the movable gear sleeve 10 or the upper and lower

movable cam bodies

5 and 6, such as a holding sleeve 4, but finally needs to act on the movable gear sleeve 10 or the upper and lower

movable cam bodies

5 and 6 and the holding sleeve 4 to reset the movable gear sleeve 10 or the upper and lower

movable cam bodies

5 and 6 and the holding sleeve 4 towards the upper part.

In the above embodiment, when the reset mechanism acts on the movable gear sleeve 10 or the upper and lower

movable cam bodies

5 and 6 first, the movable gear sleeve 10 or the upper and lower

movable cam bodies

5 and 6 are used as the driving part to drive the grip sleeve 4 to move during reset, so that only one corresponding abutting surface of the movable gear sleeve 10 or the upper and lower

movable cam bodies

5 and 6 is needed; when the reset mechanism acts on the holding sleeve 4 firstly, the holding sleeve 4 drives the movable gear sleeve 10 or the upper and lower

movable cam bodies

5 and 6 to move during reset, the corresponding abutting surfaces of the movable gear sleeve 10 or the upper and lower

movable cam bodies

5 and 6 need to be two, namely a corresponding groove needs to be formed in the movable gear sleeve 10 or the upper and lower

movable cam bodies

5 and 6, and the groove needs to accommodate the convex block 41 on the holding sleeve 4 to enter.

In the above embodiment, the protrusion is disposed on the grip sleeve 4, or the protrusion may be disposed on the movable gear sleeve 10 or the upper and lower

movable cam bodies

5 and 6, and an abutting surface matched with the protrusion is disposed at a position corresponding to the grip sleeve 4. However, the provision of the projection on the grip sleeve 4 facilitates assembly of the components.

In the above embodiment, the most preferable scheme of the protrusions 41 on the grip sleeve 4 is that the protrusions 41 are arranged in pairs, and the pairs of protrusions 41 are symmetrically distributed with respect to the axis. In this way, the acting force of the lug 41 on the movable gear sleeve 10 or the upper and lower

movable cam bodies

5 and 6 can be balanced, and the transmission of motion is more facilitated.

The position of the penholder assembly 1 corresponding to the protrusion 41 is provided with an axial slot 11, the slot 11 can accommodate the protrusion 41 from the outside of the penholder assembly 1 to pass through the slot 11 to enter the penholder assembly 1, and meanwhile, the slot 11 has a certain axial space, which can allow the protrusion 41 to axially move in the slot 11 within a certain range.

In the first embodiment, the connecting pin 7 is partially or completely sunk in the axial slot 11 of the barrel assembly 1 in the radial direction.

In this way, the axial slots 11 guide the axial movement of the mobile toothed sleeve 10 and also limit the circumferential rotation of the mobile toothed sleeve 10.

In the second embodiment, the upper protrusion 41' on the grip 4 extends into the corresponding radial hole of the upper movable cam body 5, and the lower protrusion 41 ″ extends into the corresponding radial hole of the lower movable cam body 6.

Thus, the upper and lower

movable cam bodies

5 and 6 are guided and limited in circumferential rotation by the grip sleeve 4 through the upper and lower projections 41' and 41 ".

In the first embodiment, in order to enable the connecting pin 7 on the movable gear sleeve 10 to be installed in the axial slot 11 in the barrel assembly 1, the barrel assembly 1 is divided into the upper and lower parts 1', 1 ″ at the position of the axial slot 11, one part of the upper and lower parts includes all or most of the axial slot 11, and the two parts of the split barrel assembly are connected through the connecting sleeve 14 and the connecting structure therebetween. In consideration of the installation space and the aesthetic appearance of the use, in this embodiment, the axial slot 11 is entirely included in the lower barrel assembly part 1 ″ while the grip sleeve 4 extends upward to cover the outside of the connection sleeve 14.

In the invention, a holding sleeve locking mechanism can be arranged, and the holding sleeve locking mechanism can lock and unlock the axial movement of the holding sleeve. Thus, when the grip sleeve is locked, the grip sleeve cannot be axially moved, and the mechanical pencil is used as a general mechanical pencil. This gives the user the opportunity to select to lock the grip when the user does not want to use the automatic lead rotation feature of the mechanical pencil.

The grip sleeve locking mechanism may be such that: comprises an operating part 81 and a locking block 82, wherein the operating part 81 can control the locking block 82 to enter and move out of the axial slot 11 on the penholder assembly 1.

Fig. 15 shows a grip lock mechanism of a simple structure in which an opening needs to be formed in the grip 4 to expose the manipulation portion 81 outside the grip 4. Of course, a more complicated structure may be provided such that the manipulating portion 81 is not located within the position of the grip sleeve 4, thereby eliminating the need for an opening on the grip sleeve 4.

The grip sleeve locking mechanism can also have other various structural forms, can be locked on the end surface of the grip sleeve, can also be locked in the middle of the grip sleeve, and can also be arranged on the grip sleeve and locked on the penholder assembly.

In the present invention, directional means that the axial direction of the mechanical pencil is toward one end of the cap, and directional means that the axial direction of the mechanical pencil is toward one end of the writing end.

Claims

1. The utility model provides a propelling pencil with automatic core function of changeing, includes pen-holder subassembly and sets up the refill subassembly in the pen-holder subassembly, its characterized in that: the pen core component is connected with a rotating body in a circumferential linkage manner, a holding sleeve for holding by a hand during writing is arranged outside the pen holder component and can axially move relative to the pen holder component, and a driving mechanism is arranged between the holding sleeve and the rotating body and converts the axial reciprocating motion of the holding sleeve into the rotating motion of the rotating body and transmits the rotating motion to the pen core component to rotate the pen core;

the driving mechanism comprises an upper cam surface and a lower cam surface which are arranged on the upper surface and the lower surface of a rotating body, the positions opposite to the upper cam surface and the lower cam surface are respectively provided with an upper movable cam surface and a lower movable cam surface which correspond to each other, the meshing positions of the upper cam surface and the lower cam surface of the rotating body and the upper movable cam surface and the lower movable cam surface are staggered to be less than one phase, the rotating body is arranged between the upper movable cam surface and the lower movable cam surface, the upper movable cam surface and the lower movable cam surface are in linkage connection with the grip sleeve, the upper movable cam surface and the lower movable cam surface are alternately meshed with the upper cam surface and the lower cam surface of the rotating body along with the axial movement of the grip sleeve, and the axial movement range of the grip sleeve relative to the penholder assembly is the same as the up-down movement range of the rotating body relative to the upper movable cam surface and the lower movable cam surface.

2. The mechanical pencil with automatic lead-rotating function according to claim 1, wherein: the upper movable cam surface is arranged on the upper movable cam body, the lower movable cam surface is arranged on the lower movable cam body, the upper movable cam body and the lower movable cam body are fixedly connected into an integral structure through a connecting pin to form a movable gear sleeve, the rotating body is accommodated between the upper movable cam body and the lower movable cam body and has a certain gap, and the holding sleeve is in linkage connection with the movable gear sleeve.

3. The mechanical pencil with automatic lead rotation function according to claim 2, wherein: a convex block and a leaning surface which are mutually leant against each other are arranged between the holding sleeve and the movable gear sleeve.

4. The mechanical pencil with automatic lead rotation function according to claim 2, wherein: one of the upper movable cam body and the lower movable cam body is arranged in a discontinuous split mode, each split part is fixedly connected with different connecting feet, and meanwhile, the whole movable gear sleeve or the connecting foot part on the movable gear sleeve is made of elastic materials.

5. The mechanical pencil with automatic lead rotation function according to claim 4, wherein: the number of the connecting pins is two, and the two connecting pins are respectively positioned at symmetrical positions outside the rotating body; the upper movable cam body is a continuous circular ring, the lower movable cam body is a discontinuous circular ring part, and the lower movable cam body is also two corresponding to the two connecting pins and is respectively fixedly connected with the connecting pins.

6. The mechanical pencil with automatic lead rotation function according to claim 2, wherein: one of the upper movable cam body and the lower movable cam body is buckled with the connecting foot.

7. The mechanical pencil with automatic lead-rotating function according to claim 1, wherein: the upper movable cam surface is arranged on the upper movable cam body, the lower movable cam surface is arranged on the lower movable cam body, and the upper movable cam body and the lower movable cam body are respectively connected with the holding sleeve in a linkage manner.

8. The mechanical pencil with automatic lead rotation function according to claim 7, wherein: the grip sleeve is provided with a convex block and an abutting surface which are abutted against each other between the upper movable cam body and the lower movable cam body and the axial positions of the upper movable cam body and the lower movable cam body which correspond to the grip sleeve respectively.

9. The mechanical pencil with automatic lead rotation function according to any one of claims 2 to 8, wherein: a reset mechanism is arranged, and the reset mechanism enables the upper movable cam body, the lower movable cam body and the holding sleeve to move upwards.

10. The mechanical pencil with automatic lead rotation function according to claim 3 or 8, wherein: the penholder assembly is provided with an axial slot corresponding to the position of the lug, the slot can accommodate the lug to enter or pass through the slot, and meanwhile, the slot has an axial space which can allow the lug to axially move in the slot within a certain range.

11. The mechanical pencil with automatic lead rotation function according to claim 3, wherein: the position of the penholder assembly corresponding to the lug is provided with an axial slot, the slot can accommodate the lug to enter or pass through the slot, meanwhile, the slot has an axial space which can allow the lug to axially move in the slot within a certain range, and the radial part or all of the connecting pin is sunk in the axial slot of the penholder assembly.

12. The mechanical pencil with automatic lead-rotating function according to claim 1, wherein: when the lower cam surface is completely engaged with the lower movable cam surface, the engagement position differs from the engagement position of the upper cam surface with the upper movable cam surface by less than half a phase.

13. The mechanical pencil with automatic lead-rotating function according to claim 1, wherein: a grip sleeve locking mechanism is provided, which can lock and unlock the axial movement of the grip sleeve.

14. The mechanical pencil with automatic lead rotation function according to claim 10, wherein: the handle sleeve locking mechanism comprises an operating part and a locking block, wherein the operating part can control the locking block to enter and move out of the axial groove on the penholder assembly.