A mechanical pencil

Abstract

The invention discloses a propelling pencil, comprising a pen shell, a core assembly and a core storage tube; the core assembly is arranged in the pen shell, and a core pressing spring is arranged between the core assembly and the core storage tube; a pressing spring is arranged between the front end of the pen shell and the front end of the core assembly; a limiting rib matching with a gear of the core assembly is arranged on the inner wall of the pen shell, and a first sliding groove matching with the limiting rib is arranged on the outer side wall of the gear; the core assembly can move under force, when the limiting rib is matched in the first sliding groove and the opening of the core assembly is in an open state, the head of the core assembly extends into the head of the pen shell, and the lead core can be loaded into the core assembly; when the end of the limiting rib abuts against the tooth groove of the gear, the head of the core assembly extends out of the head of the pen shell, and the opening of the core assembly is in a closed state.

Description

Technical Field

[0001] The present invention relates to the technical field of writing tools, and more specifically to a mechanical pencil. Background Art

[0002] In order to keep writing smoothly, wooden pencils need to be sharpened frequently. The emergence of automatic pencils meets people's needs for convenient use. Automatic pencils, as the name suggests, are pencils that can automatically or semi-automatically eject the lead without sharpening. Before using an automatic pencil, you need to put in a thin lead made of graphite (commonly known as a lead), and after putting in the lead, close the back cover to prevent the lead from falling out. There is a spring inside the automatic pencil. Pressing the back cover can make the lead extend from the front end to a fixed length and write fonts of the same thickness. However, the damping head of the current mechanical pencil is always exposed outside the pen shell, and it is easy to be damaged when falling or bumping. The damping head is a core component, which will destroy the automatic lead ejection function, making the mechanical pencil unusable. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a mechanical pencil, wherein when the mechanical pencil is not in use, a damping head can be retracted into a pen shell, thereby effectively protecting the damping head from being damaged when falling or bumping.

[0004] The technical solution of the present invention is to provide a mechanical pencil with the following structure, including a pen shell, a core assembly and a core storage tube; the core assembly is arranged in the pen shell, and a core pressing spring is arranged between the core assembly and the core storage tube; a pressing spring is arranged between the front end of the pen shell and the front end of the core assembly; a limiting rib matching the gear of the core assembly is arranged on the inner wall of the pen shell, and a first sliding groove matching the limiting rib is arranged on the outer side wall of the gear; the core assembly can move under force, when the limiting rib is engaged in the first sliding groove and the opening of the core assembly is in an open state, the head of the core assembly extends into the head of the pen shell, and the lead can be loaded into the core assembly; when the end of the limiting rib is against the tooth groove of the gear, the head of the core assembly extends out of the head of the pen shell, and the opening of the core assembly is in a closed state.

[0005] After adopting the above structure, the mechanical pencil of the present invention has the following advantages compared with the prior art:

[0006] Since the inner wall of the pen shell of the mechanical pencil of the present invention is provided with a limiting rib matching the gear of the movement assembly, and the outer wall of the gear is provided with a first sliding groove matching the limiting rib; the movement assembly can move when subjected to force, and when the limiting rib is engaged in the first sliding groove and the opening of the movement assembly is in an open state, the head of the movement assembly extends into the head of the pen shell, and the lead core can be loaded into the movement assembly at this time; when the end of the limiting rib is against the tooth groove of the gear, the head of the movement assembly extends out of the head of the pen shell, and the opening of the movement assembly is in a closed state; that is, the head of the movement assembly (damping head) can be extended out of the head of the pen shell when in use, and the damping head can be retracted into the pen shell when not in use, which can effectively protect the damping head from being damaged when falling or bumping.

[0007] As an improvement, the mechanical pencil further comprises a connector, the connector being connected between the pusher of the core assembly and the core storage tube, and the core pressing spring being arranged between the core assembly and the connector. With this structure, assembly is more convenient and the structural connection is more reliable.

[0008] As an improvement, the movement assembly includes the propeller, the driving assembly, the flowering assembly and the damping head; the flowering assembly includes the movement front sleeve, the outer wall of the movement front sleeve is rotatably connected with the gear, and the damping head is connected to the front end of the movement front sleeve; the driving assembly includes a rotating wheel and a movement rear sleeve, the movement rear sleeve is matched on the rear end of the movement front sleeve, the rotating wheel is sleeved outside the movement front sleeve and is located between the gear and the movement rear sleeve, and the movement pressing spring is arranged between the movement rear sleeve and the connector; when pressed, the movement assembly moves forward, and the rotating wheel drives the gear to rotate so that the limiting rib is inserted into the first slide groove or the tooth groove of the gear. After adopting this structure, the movement assembly structure is integrated, the integrity and versatility are strong, and it is suitable for more pen models; the front gear and rotating wheel design control the state change of the movement.

[0009] As an improvement, a second slide groove matching the limiting rib is provided on the outer side wall of the rotating wheel, and the limiting rib is slidably fitted in the second slide groove. This structure is simple, and the limiting rib can limit the circumferential rotation of the rotating wheel.

[0010] As an improvement, a connection hole is provided on the side wall of the front sleeve of the movement, and a protrusion matching the connection hole is provided on the side wall of the rear sleeve of the movement, and the protrusion is connected to the side wall of the rear sleeve of the movement through a spring; when the front end of the rear sleeve of the movement is inserted into the rear end of the front sleeve of the movement, the protrusion is embedded in the connection hole. With this structure, the protrusion and the connection hole structure can make the connection structure between the front sleeve of the movement and the rear sleeve of the movement more stable, ensuring the integrated structure of the movement assembly.

[0011] As an improvement, a guiding inclined surface is provided at the connection between the spring piece and the protrusion. With this structure, the rear sleeve of the movement can be connected to the front sleeve of the movement more smoothly.

[0012] As an improvement, a receiving hole is provided on the side wall of the rear sleeve of the movement, one end of the spring is connected to the front side wall of the receiving hole, and the protrusion is exposed outside the receiving hole. With this structure, the structure is simple and easy to install.

[0013] As an improvement, a first limiting ring is provided on the outer side wall of the movement rear sleeve, the front end face of the first limiting ring abuts against the rear end face of the movement front sleeve; the rear end face of the rotating wheel abuts against the front end face of the first limiting ring; the front end of the movement pressing spring abuts against the rear end face of the first limiting ring. With this structure, the structure is simple and easy to assemble.

[0014] As an improvement, the front end of the connector is inserted into the movement rear sleeve, a first limiting step is provided on the side wall of the connector, the movement pressing spring is sleeved outside the connection between the movement rear sleeve and the connector, and the rear end of the movement pressing spring abuts against the step surface of the first limiting step. With this structure, the structure is simple and easy to assemble.

[0015] As an improvement, a second limiting ring is provided on the outer side wall of the front sleeve of the movement, and the front end face of the gear abuts against the rear end face of the second limiting ring. With this structure, the gear is limited by the second limiting ring, and the limiting structure is simple.

[0016] As an improvement, the flowering component also includes a core inner sleeve and a flowering, the core inner sleeve is tightly fitted in the core front sleeve, the flowering is arranged in the core inner sleeve, a core spring is arranged between the flowering and the core inner sleeve, the front end of the propeller is inserted into the core inner sleeve and connected with the rear end of the flowering, the rear end of the propeller is inserted into the core rear sleeve and connected with the front end of the connector; the propeller can push the flowering to move in the core inner sleeve. After adopting this structure, the flowering component has a simple structure and is convenient to connect and assemble with the propeller.

[0017] As an improvement, the front end of the movement rear sleeve is provided with a third limiting ring, the front end of the propeller is provided with a second limiting step, and the second limiting step is limited to the front side of the third limiting ring. With this structure, the third limiting ring can limit the propeller, and the structure is simple and reliable.

[0018] As an improvement, a third limiting step is provided on the side wall of the opening, a fourth limiting ring is provided on the inner wall of the inner sleeve of the movement, the movement spring is sleeved outside the opening, one end of the movement spring abuts against the rear end face of the fourth limiting ring, and the other end of the movement spring abuts against the front end face of the third limiting step. With this structure, the structure is simple and easy to assemble.

[0019] As an improvement, the flowering component also includes an opening and closing drive component, which includes a stopper and a closure member, wherein the closure member is arranged in the front end of the inner sleeve of the movement and is located in front of the fourth limiting ring; the stopper is located in the front end of the front sleeve of the movement and is located in front of the inner sleeve of the movement; the front end of the flowering can move between the stopper and the closure member, and when the front end of the flowering is inserted into the closure member, the front end of the flowering is closed, and when the front end of the flowering is inserted into the stopper, the front end of the flowering is opened. With this structure, the opening and closing drive component has a simple structure, is easy to assemble, and has flexible opening and closing control.

[0020] As an improvement, a ball is provided on the side wall of the opening, and an embedding groove is provided on the side wall of the opening, one side of the ball is embedded in the embedding groove, and the other side of the ball can roll with the inner wall of the closure and the inner wall of the stop. With this structure, the opening can move more flexibly between the closure and the stop due to the action of the ball, reducing friction.

[0021] As an improvement, the front end of the closure member is provided with a guide hole. With this structure, the guide hole guides the ball and prevents the ball from being stuck.

[0022] As an improvement, the aperture of the stopper is larger than the aperture of the closure; a closing opening is provided at the front end of the stopper, and the minimum aperture of the closing opening is smaller than the aperture of the closure. With this structure, the closing opening of the stopper has a limiting effect on the ball, which can prevent the ball from falling out.

[0023] As an improvement, a fourth limiting step is provided inside the front end of the front sleeve of the movement, the outer wall of the closing end of the stopper abuts against the fourth limiting step, and the rear end face of the stopper abuts against the front end face of the inner sleeve of the movement. With this structure, the fourth limiting step has a limiting effect on the stopper.

[0024] As an improvement, the front end of the movement front sleeve is provided with a convex neck, the rear end of the push spring is sleeved outside the convex neck, and the front end of the push spring is against the head of the pen shell. After adopting this structure, the assembly structure of the push spring is simple.

[0025] As an improvement, the rear end of the damping head extends into the convex neck, the front end of the damping head is exposed outside the convex neck, and the front end of the damping head can pass through the pen hole of the head of the pen shell and be exposed outside the pen shell. After adopting this structure, the structure is simple and easy to assemble.

[0026] As an improvement, the rear end of the damping head is slidably fitted in the convex neck, and a damping spring is provided between the damping head and the closing end of the stopper. With this structure, the damping head can automatically eject the core, which is more convenient to use.

[0027] As an improvement, the mechanical pencil further includes a pressing assembly, which includes a pressing connector and a top cap; the pressing connector is limited in the rear end of the pen shell, one end of the pressing connector is connected to the rear end of the core storage tube, and the other end of the pressing connector is connected to the top cap. After adopting this structure, the pressing connector connection structure is simple and easy to assemble.

[0028] As an improvement, the outer side wall of the push connector is provided with a fifth limiting step, the inner side wall of the rear end of the pen housing is provided with a fifth limiting ring, and the rear end surface of the fifth limiting step can be limited on the front end surface of the fifth limiting ring. With this structure, the limiting structure of the push connector is relatively simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 The figure is a schematic diagram of the three-dimensional structure of the mechanical pencil (when loaded with lead) of the present invention.

[0030] Figure 2 The figure is a schematic cross-sectional view of the mechanical pencil (when loaded with lead) of the present invention.

[0031] Figure 3 for Figure 2 Schematic diagram of the enlarged structure of the part in the middle frame.

[0032] Figure 4 It is a partial three-dimensional structural schematic diagram of the mechanical pencil of the present invention.

[0033] Figure 5 The figure is a schematic diagram of the exploded structure of the movement assembly of the mechanical pencil of the present invention.

[0034] Figure 6 The exploded structural diagram of the driving assembly of the movement assembly of the mechanical pencil of the present invention is shown.

[0035] Figure 7 The present invention is a schematic diagram of the exploded structure of the blooming component of the movement component of the mechanical pencil of the present invention.

[0036] Figure 8 The figure is a schematic cross-sectional view of the mechanical pencil (when the damping head extends out of the pencil housing) of the present invention.

[0037] Fig. 9 The figure is a schematic cross-sectional three-dimensional structural diagram of the mechanical pencil (when loaded with lead) of the present invention.

[0038] Fig.10 for Fig. 9 Schematic diagram of the enlarged structure of part B.

[0039] Fig.11 The figure is a schematic cross-sectional three-dimensional structural diagram of the mechanical pencil of the present invention (when the damping head extends out of the pen housing).

[0040] Fig.12 for Fig.11 Schematic diagram of the enlarged structure of part C.

[0041] As shown in the figure: 1. Connector, 101. First limiting step, 2. Core storage tube, 3. Upper pen rod, 301. Fifth limiting ring, 4. Lower pen rod, 401. Limiting rib, 5. Pusher, 501. Second limiting step, 6. Damping head, 7. Movement front sleeve, 701. Fourth limiting step, 702. Neck, 703. Second limiting ring, 704. Connecting hole, 8. Movement inner sleeve, 801. Fourth limiting ring, 9. Flower, 901. Third limiting step, 10. Movement spring, 11. Stopper, 12. Closing piece, 1201. Guide port, 13. Ball, 14. Lead core, 15. Press spring, 16. Damping spring, 17. Gear, 1701. First slide groove, 18. Rotating wheel, 1801, second slide groove, 19, movement rear sleeve, 1901, first limiting ring, 1902, spring piece, 1903, accommodating hole, 1904, protrusion, 1905, guide slope, 1906, third limiting ring, 20, movement pressing spring, 21, pressing connector, 2101, fifth limiting step, 22, top cap. DETAILED DESCRIPTION

[0042] In order to better understand the present application, a more detailed description of various aspects of the present application will be made with reference to the accompanying drawings. It should be understood that these detailed descriptions are only descriptions of exemplary embodiments of the present application, and do not limit the scope of the present application in any way. Throughout the specification, the same figure numerals refer to the same elements.

[0043] In the drawings, the thickness, size and shape of objects have been slightly exaggerated for ease of explanation. The drawings are only examples and are not drawn strictly to scale.

[0044] It should also be understood that the terms “comprises,” “including,” “has,” “includes,” and “containing,” when used in this specification, indicate the presence of the described features, integers, steps, operations, elements, and / or parts, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, parts, and / or combinations thereof.

[0045] like Figures 1 to 7 As shown, the present application discloses a mechanical pencil including a pen case, a core assembly, a connector 1, a core storage tube 2 and a pressing assembly.

[0046] In order to clearly describe the structure of the mechanical pencil, in the present application, the position close to the pen tip is set as the front side, and the position away from the pen tip is set as the back side.

[0047] The pen housing comprises an upper pen holder 3 and a lower pen holder 4, wherein the upper pen holder 3 and the lower pen holder 4 are connected by threads. A pen head hole is provided at the end of the lower pen holder 4. The core assembly, the connector 1, the core storage tube 2 and part of the pressing assembly are all installed in the space formed by the upper pen holder 3 and the lower pen holder 4.

[0048] The movement assembly includes the propeller 5, the driving assembly, the flowering assembly and the damping head 6.

[0049] The flowering component includes a front sleeve 7 of the movement, an inner sleeve 8 of the movement, a flowering 9 and an opening and closing drive component. The inner sleeve 8 of the movement is tightly fitted in the front sleeve 7 of the movement, and the front end of the propeller 5 extends into the inner sleeve 8 of the movement. The flowering 9 is arranged in the inner sleeve 8 of the movement, and the flowering 9 is formed by merging two flowering parts, and the lead core 14 passes between the flowering parts, and the two flowering parts are used to clamp the outside of the lead core 14. The front end of the propeller 5 is provided with a connecting groove, and the shape of the connecting groove matches the shape of the rear end of the flowering 9, and the rear end of the flowering 9 fits in the connecting groove. A movement spring 10 is provided between the opening 9 and the movement inner sleeve 8, a third limiting step 901 is provided on the side wall of the opening 9, a fourth limiting ring 801 is provided on the inner wall of the movement inner sleeve 8, the movement spring 10 is sleeved on the outside of the opening 9, one end of the movement spring 10 abuts against the rear end face of the fourth limiting ring 801, and the other end of the movement spring 10 abuts against the front end face of the third limiting step 901.

[0050] The opening and closing drive assembly includes a stopper 11 and a closing member 12. The closing member 12 is arranged in the front end of the inner sleeve 8 of the movement and is located in front of the fourth limiting ring 801, and a guide port 1201 is arranged in the front end of the closing member 12. The stopper 11 is located in the front end of the front sleeve 7 of the movement and in front of the inner sleeve 8 of the movement, and the aperture of the stopper 11 is larger than the aperture of the closing member 12; the front end of the stopper 11 is provided with a closing opening, and the minimum aperture of the closing opening is smaller than the aperture of the closing member 12. The front end of the front sleeve 7 of the movement is provided with a fourth limiting step 701, and the outer wall of the closing opening of the stopper 11 abuts against the fourth limiting step 701, and the rear end face of the stopper 11 abuts against the front end face of the inner sleeve 8 of the movement. The side walls of the front ends of the two flowering parts are provided with a ball 13, that is, the side walls of the flowering parts are provided with an embedding groove, one side of the ball 13 is embedded in the embedding groove, and the other side of the ball 13 can roll with the inner wall of the closing part 12 and the inner wall of the stopper 11. The front end of the flowering part 9 can move between the stopper 11 and the closing part 12. When the front end of the flowering part 9 is inserted into the closing part 12, the front end of the flowering part 9 is closed, and the flowering part 9 clamps the lead core 14, and the lead core 14 cannot move. When the front end of the flowering part 9 is inserted into the stopper 11, the front end of the flowering part 9 is opened, and the lead core 14 can move between the two flowering parts.

[0051] The front end of the movement front sleeve 7 is provided with a convex neck 702, and a pressing spring 15 is provided between the convex neck 702 and the head of the pen shell, that is, the rear end of the pressing spring 15 is sleeved outside the convex neck 702, and the front end of the pressing spring 15 is against the head of the pen shell. The rear end of the damping head 6 extends into the convex neck 702, and the front end of the damping head 6 is exposed outside the convex neck 702. The front end of the damping head 6 can pass through the pen head hole of the head of the pen shell and be exposed outside the pen shell. The rear end of the damping head 6 is slidably fitted in the convex neck 702, and a damping spring 16 is provided between the damping head 6 and the closing end of the stopper 11.

[0052] The flowering assembly is installed in the lower pen rod 4, the gear 17 is rotatably connected to the outer side wall of the front sleeve 7 of the movement, a second limiting ring 703 is provided on the outer side wall of the front sleeve 7 of the movement, and the front end face of the gear 17 abuts against the rear end face of the second limiting ring 703. The inner wall of the lower pen rod 4 is provided with a limiting rib 401 matching the gear 17 of the movement assembly, and the outer side wall of the gear 17 is provided with a first slide groove 1701 matching the limiting rib 401. In this specific embodiment, the first slide groove 1701 is provided with three paths, and the limiting rib 401 is provided with three lines.

[0053] The driving assembly includes a rotating wheel 18 and a movement rear sleeve 19, and the movement rear sleeve 19 is matched with the rear end of the movement front sleeve 7. The rotating wheel 18 is sleeved outside the movement front sleeve 7 and is located between the gear 17 and the movement rear sleeve 19. The outer wall of the rotating wheel 18 is provided with a second slide groove 1801 matching the limiting rib 401, and the limiting rib 401 is slidably matched in the second slide groove 1801. The movement pressing spring 20 is arranged between the movement rear sleeve 19 and the connector 1. The outer wall of the movement rear sleeve 19 is provided with a first limiting ring 1901, and the front end face of the first limiting ring 1901 abuts against the rear end face of the movement front sleeve 7. The rear end face of the rotating wheel 18 abuts against the front end face of the first limiting ring 1901. The front end of the movement pressing spring 20 abuts against the rear end face of the first limiting ring 1901. The side wall of the movement front sleeve 7 is provided with a connection hole 704, and the side wall of the movement rear sleeve 19 is provided with a protrusion 1904 matching the connection hole 704, and the protrusion 1904 is connected to the side wall of the movement rear sleeve 19 through a spring piece 1902; when the front end of the movement rear sleeve 19 is inserted into the rear end of the movement front sleeve 7, the protrusion 1904 is embedded in the connection hole 704. The side wall of the movement rear sleeve 19 is provided with a receiving hole 1903, one end of the spring piece 1902 is connected to the front side wall of the receiving hole 1903, and the protrusion 1904 is exposed outside the receiving hole 1903. A guiding inclined surface 1905 is provided at the connection between the spring piece 1902 and the protrusion 1904. When pressed, the rear sleeve of the movement pushes the front sleeve of the movement forward, and the rotating wheel and the gear move relative to the limiting rib. When the gear disengages from the limiting rib, the gear rotates, and the end of the limiting rib can be inserted into the tooth groove of the gear.

[0054] The front end of the connector 1 is inserted into the movement rear sleeve 19, and the side wall of the connector 1 is provided with a first limiting step 101. The movement pressing spring 20 is sleeved outside the connection between the movement rear sleeve 19 and the connector 1, and the rear end of the movement pressing spring 20 abuts against the step surface of the first limiting step 101. The rear end of the pusher 5 extends into the movement rear sleeve 19 and is connected to the front end of the connector 1, that is, the front end of the connector 1 is provided with an embedding groove, and the rear end of the pusher 5 is embedded in the embedding groove. The front end of the movement rear sleeve 19 is provided with a third limiting ring 1906, and the front end of the pusher 5 is provided with a second limiting step 501, and the second limiting step 501 is limited to the front side of the third limiting ring 1906.

[0055] The pressing assembly includes a pressing connector 21 and a top cap 22; the pressing connector 21 is limited in the rear end of the pen housing, a fifth limiting step 2101 is provided on the outer wall of the pressing connector 21, a fifth limiting ring 301 is provided on the inner wall of the rear end of the upper pen barrel 3, and the rear end face of the fifth limiting step 2101 is limited on the front end face of the fifth limiting ring 301. One end of the pressing connector 21 is connected to the rear end of the core storage tube 2, and the other end of the pressing connector 21 is connected to the top cap 22.

[0056] The inner cavity of the propeller 5, the gap between the two blooming parts, the inner cavity of the stopper 11 and the inner cavity of the damping head 6 form a core loading passage. The inner cavity of the core storage tube 2 and the inner cavity of the connector 1 are connected to the core loading passage.

[0057] In the initial state, the damping head 6 extends into the nib hole of the lower pen shaft 4, the front end of the opening 9 extends into the closing piece 12, the opening 9 is in a closed state, the limiting rib 401 cooperates with the first slide groove 1701 of the gear 17 and the second slide groove 1801 of the rotating wheel 18, and under the action of the movement pressing spring 20, a movable distance is left between the connector 1 and the rear sleeve 19 of the movement; under the action of the movement pressing spring and the pressing spring 15, the connector 21 is pressed against the fifth limiting ring 301.

[0058] like Figures 8 to 12 As shown, when the mechanical pencil of the present application is used, the top cap 22 is gently pressed, and the force is applied to press the connector 21, the core storage tube 2 and the connector 1 to move forward, the movement pressing spring 20 is compressed, the connector 1 pushes the propeller 5 and the opening 9 to move, the front end of the opening 9 extends into the stop 11, the opening 9 is opened, and the lead 14 in the core storage tube 2 can be loaded into the core loading channel to complete the core loading. Continue to press the top cap 22, the connector pushes the movement assembly forward, during this process, the rotating wheel and the gear slide on the limiting rib, when the limiting rib is separated from the first slide groove of the gear, the gear rotates; at this time, release the pressing top cap, under the action of the pressing spring, the movement assembly moves backward, the gear and the rotating wheel also move backward, and at the same time the gear rotates, the limiting rib slides into the tooth groove of the gear and presses against the gear. At this time, the front end of the damping head 6 passes through the pen head hole and is exposed outside the lower pen shaft 4, and the pressing spring 15 is compressed. Under the action of the movement pressing spring 20 and the movement spring 10, the opening 9, the propeller 5, the connector 1, the oil pipe, the pressing connector 21 and the movement rear sleeve 19 are reset. In the process of writing, under the action of the damping spring 16, the damping head 6 can automatically come out of the core.

Claims

1. A mechanical pencil, characterized in that: The invention comprises a pen case, a core assembly and a core storage tube (2); the core assembly is arranged in the pen case, and a core pressing spring is arranged between the core assembly and the core storage tube (2); a pressing spring (15) is arranged between the front end of the pen case and the front end of the core assembly; a limiting rib (401) matching the gear (17) of the core assembly is arranged on the inner wall of the pen case, and a first sliding groove (15) matching the limiting rib (401) is arranged on the outer wall of the gear (17). 701); the movement assembly can move under force, when the limiting rib (401) is engaged in the first slide groove (1701) and the opening of the movement assembly is in an open state, the head of the movement assembly extends into the head of the pen shell, and the lead can be loaded into the movement assembly; when the end of the limiting rib (401) abuts against the tooth groove of the gear (17), the head of the movement assembly extends out of the head of the pen shell, and the opening of the movement assembly is in a closed state.

2. The mechanical pencil according to claim 1, characterized in that: The mechanical pencil also includes a connector, which is connected between the pusher of the core assembly and the core storage tube, and the core pressing spring is arranged between the core assembly and the connector.

3. The mechanical pencil according to claim 2, characterized in that: The movement assembly comprises the propeller (5), a driving assembly, a flowering assembly and a damping head (6); the flowering assembly comprises a movement front sleeve (7), the outer side wall of the movement front sleeve (7) is rotatably connected to the gear (17), and the damping head (6) is connected to the front end of the movement front sleeve (7); the driving assembly comprises a rotating wheel (18) and a movement rear sleeve (19), and the movement rear sleeve (19) is engaged with the movement front sleeve (7) ), the rotating wheel (18) is sleeved outside the movement front sleeve (7) and is located between the gear (17) and the movement rear sleeve (19), and the movement pressing spring (20) is arranged between the movement rear sleeve (19) and the connector (1); when pressed, the movement assembly moves forward, and the rotating wheel (18) drives the gear (17) to rotate so that the limiting rib (401) is inserted into the first sliding groove (1701) or the tooth groove of the gear (17).

4. The mechanical pencil according to claim 3, characterized in that: A second slide groove (1801) matching the limiting rib (401) is provided on the outer side wall of the rotating wheel (18), and the limiting rib (401) is slidably fitted in the second slide groove (1801).

5. The mechanical pencil according to claim 3, characterized in that: A connecting hole (704) is provided on the side wall of the movement front sleeve (7), and a protrusion (1904) matching the connecting hole (704) is provided on the side wall of the movement rear sleeve (19), and the protrusion (1904) is connected to the side wall of the movement rear sleeve (19) via a spring sheet (1902); when the front end of the movement rear sleeve (19) is inserted into the rear end of the movement front sleeve (7), the protrusion (1904) is embedded in the connecting hole (704).

6. The mechanical pencil according to claim 5, characterized in that: A guiding slope (1905) is provided at the connection between the spring piece (1902) and the protrusion (1904).

7. The mechanical pencil according to claim 5, characterized in that: A receiving hole (1903) is provided on the side wall of the movement rear sleeve (19), one end of the spring sheet (1902) is connected to the front side wall of the receiving hole (1903), and the protrusion (1904) is exposed outside the receiving hole (1903).

8. The mechanical pencil according to claim 3, characterized in that: A first limiting ring (1901) is provided on the outer side wall of the movement rear sleeve (19), and the front end surface of the first limiting ring (1901) abuts against the rear end surface of the movement front sleeve (7); the rear end surface of the rotating wheel (18) abuts against the front end surface of the first limiting ring (1901); and the front end of the movement pressing spring (20) abuts against the rear end surface of the first limiting ring (1901).

9. The mechanical pencil according to claim 8, characterized in that: The front end of the connector (1) is inserted into the movement rear sleeve (19), a first limiting step (101) is provided on the side wall of the connector (1), the movement push spring (20) is sleeved outside the connection between the movement rear sleeve (19) and the connector (1), and the rear end of the movement push spring (20) abuts against the step surface of the first limiting step (101).

10. The mechanical pencil according to claim 3, characterized in that: A second limiting ring (703) is provided on the outer side wall of the front sleeve (7) of the movement, and the front end surface of the gear (17) abuts against the rear end surface of the second limiting ring (703).

11. The mechanical pencil according to claim 9, characterized in that: The flowering component further comprises a movement inner sleeve (8) and a flowering (9), wherein the movement inner sleeve (8) is tightly fitted in the movement front sleeve (7), the flowering (9) is arranged in the movement inner sleeve (8), a movement spring (10) is arranged between the flowering (9) and the movement inner sleeve (8), the front end of the propeller (5) extends into the movement inner sleeve (8) and is connected to the rear end of the flowering (9), and the rear end of the propeller (5) extends into the movement rear sleeve (19) and is connected to the front end of the connector (1); the propeller (5) can push the flowering (9) to move in the movement inner sleeve (8).

12. The mechanical pencil according to claim 11, characterized in that: A third limiting ring (1906) is provided at the front end of the movement rear sleeve (19), and a second limiting step (501) is provided at the front end of the thruster (5), wherein the second limiting step (501) is limited at the front side of the third limiting ring (1906).

13. The mechanical pencil according to claim 11, characterized in that: A third limiting step (901) is provided on the side wall of the opening (9), a fourth limiting ring (801) is provided on the inner wall of the inner sleeve (8) of the movement, the movement spring (10) is sleeved outside the opening (9), one end of the movement spring (10) abuts against the rear end surface of the fourth limiting ring (801), and the other end of the movement spring (10) abuts against the front end surface of the third limiting step (901).

14. The mechanical pencil according to claim 13, characterized in that: The flowering component also includes an opening and closing drive component, the opening and closing drive component includes a stopper (11) and a closing member (12), the closing member (12) being arranged inside the front end of the inner sleeve (8) of the movement and located in front of the fourth limiting ring (801); the stopper (11) is located inside the front end of the front sleeve (7) of the movement and located in front of the inner sleeve (8) of the movement; the front end of the flowering (9) can move between the stopper (11) and the closing member (12), when the front end of the flowering (9) is inserted into the closing member (12), the front end of the flowering (9) is closed, and when the front end of the flowering (9) is inserted into the stopper (11), the front end of the flowering (9) is opened.

15. The mechanical pencil according to claim 14, characterized in that: A ball (13) is provided on the side wall of the opening (9), and an embedding groove is provided on the side wall of the opening (9). One side of the ball (13) is embedded in the embedding groove, and the other side of the ball (13) can roll with the inner wall of the closing piece (12) and the inner wall of the stopper (11).

16. The mechanical pencil according to claim 14, characterized in that: The front end of the closing piece (12) is provided with a guide opening (1201).

17. The mechanical pencil according to claim 14, characterized in that: The aperture of the stopper (11) is larger than the aperture of the closing piece (12); a closing opening is provided at the front end of the stopper (11), and the minimum aperture of the closing opening is smaller than the aperture of the closing piece (12).

18. The mechanical pencil according to claim 17, characterized in that: A fourth limiting step (701) is provided in the front end of the movement front sleeve (7), the outer wall of the closing end of the stopper (11) abuts against the fourth limiting step (701), and the rear end surface of the stopper (11) abuts against the front end surface of the movement inner sleeve (8).

19. The mechanical pencil according to claim 18, characterized in that: The front end of the movement front sleeve (7) is provided with a convex neck (702), the rear end of the push spring (15) is sleeved outside the convex neck (702), and the front end of the push spring (15) is against the head of the pen shell.

20. The mechanical pencil according to claim 19, characterized in that: The rear end of the damping head (6) extends into the convex neck (702), and the front end of the damping head (6) is exposed outside the convex neck (702). The front end of the damping head (6) can pass through the nib hole of the head of the pen shell and be exposed outside the pen shell.

21. The mechanical pencil according to claim 20, characterized in that: The rear end of the damping head (6) is slidably fitted in the convex neck (702), and a damping spring (16) is provided between the damping head (6) and the closing end of the stopper (11).

22. The mechanical pencil according to claim 1, characterized in that: The mechanical pencil further comprises a pressing assembly, wherein the pressing assembly comprises a pressing connector (21) and a top cap (22); the pressing connector (21) is limited within the rear end of the pen housing, one end of the pressing connector (21) is connected to the rear end of the core storage tube (2), and the other end of the pressing connector (21) is connected to the top cap (22).

23. The mechanical pencil according to claim 22, characterized in that: A fifth limiting step (2101) is provided on the outer side wall of the push connector (21), a fifth limiting ring (301) is provided on the inner wall at the rear end of the pen housing, and the rear end surface of the fifth limiting step (2101) can be limited on the front end surface of the fifth limiting ring (301).

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