Pen point thickness adjusting mechanism of hand-operated pencil sharpening machine

Abstract

The utility model provides a pencil point thickness adjusting mechanism of a hand-operated pencil sharpener, and belongs to the technical field of pencil sharpeners. The problem of insufficient use reliability is solved. The push rod is arranged in the rear end of the knife rest in a penetrating mode, the button is arranged on a crank, the push rod is sleeved with the reset spring, the push rod abuts against the button under the action of the reset spring, the button and the crank are fixed in the circumferential direction, a rotatable adjusting disc is arranged in the crank, the button penetrates through the adjusting disc, and a guide structure is arranged between the button and the adjusting disc. When the adjusting disc rotates, the button can be pushed to move forwards through the guide structure, an arc-shaped receding hole is formed in the side portion of the crank, and a shifting rod is arranged on the side portion of the adjusting disc in a protruding mode and penetrates out of the crank from the receding hole. The utility model has the advantages that the thickness of the adjusted pen point cannot be changed uncontrollably when the broken core is pushed out, the use reliability is improved, and the like.

Description

Technical Field

[0001] This utility model belongs to the field of pencil sharpener technology, and relates to a pencil tip thickness adjustment mechanism for a hand-cranked pencil sharpener. Background Technology

[0002] Hand-cranked pencil sharpeners are common school supplies, allowing users to sharpen pencils by cranking the handle. However, conventional hand-cranked pencil sharpeners lack the ability to control the thickness of the sharpened pencil tip, thus failing to meet diverse user needs. To this end, Chinese Patent Application No. 202323149554.1 discloses a tip thickness adjustment mechanism for a hand-cranked pencil sharpener. The hand-cranked pencil sharpener includes a blade holder and a crank handle fixed to the rear end of the blade holder. The crank handle has a mounting cavity, and the rear end of the blade holder has a guide hole communicating with the mounting cavity. The tip thickness adjustment mechanism includes a push rod passing through the guide hole and an adjustment head whose front end is located in the mounting cavity and whose rear end extends out of the crank handle. The adjustment head is slidably connected to the crank handle in the front-back direction and can rotate relative to the crank handle. A spring with elastic force acting backward on the push rod is located in the guide hole. The rear end of the push rod has a guide head that is clearance-fitted with the guide hole. The crank handle has an arc-shaped guide slope arranged around the center line of the guide hole in the mounting cavity. Several positioning grooves are provided on the guide slope. The front side of the adjustment head has a lug that can move along the guide slope and can be engaged in any one of the positioning grooves when the adjustment head rotates. The guide head abuts against the front end of the adjustment head, and the front end of the adjustment head can extend into the guide hole when the adjustment head moves forward. The initial state is with the lug located in the positioning groove furthest from the guide hole, resulting in the finest pencil tip. To achieve a thicker tip, the user simply rotates the adjustment head to move the lug along the guide slope. Because the guide slope is curved and arranged around the center line of the guide hole, its incline forces the adjustment head forward, pushing the push rod forward until the lug engages in the corresponding positioning groove, thus fixing the forward-moving push rod in place. If a lead breaks during sharpening, the user simply presses the adjustment head forward, causing it to push the push rod forward and remove the broken lead.

[0003] Both the lead ejection and the nib thickness adjustment are achieved by operating the adjustment head. Although the nib thickness adjustment is done by rotating the adjustment head and the lead ejection is done by pressing the adjustment head, in actual use it is difficult to guarantee that the adjustment head will not rotate when the lead is ejected by pressing it directly. In other words, the adjustment head may rotate uncontrollably while being pressed, resulting in an uncontrolled change in the adjusted nib thickness. Therefore, there is a problem of insufficient reliability in use. Utility Model Content

[0004] The purpose of this invention is to address the aforementioned problems in the existing technology by proposing a pencil tip adjustment mechanism for a hand-cranked pencil sharpener, thus solving the problem of insufficient reliability.

[0005] The objective of this utility model can be achieved through the following technical solutions:

[0006] A pencil tip thickness adjustment mechanism for a hand-cranked pencil sharpener, comprising a blade holder and a crank handle fixedly connected to the rear end of the blade holder, the pencil tip thickness adjustment mechanism including a push rod passing through the rear end of the blade holder, a button disposed on the crank handle, and a return spring sleeved on the push rod, the push rod abutting against the button under the action of the return spring, characterized in that the button is circumferentially fixed to the crank handle, the crank handle is provided with a rotatable adjustment disc, the button passes through the adjustment disc, a guide structure is provided between the button and the adjustment disc, the button can be pushed forward by the guide structure when the adjustment disc rotates, the side of the crank handle is provided with an arc-shaped clearance hole, and the side of the adjustment disc is provided with a lever protruding out of the crank handle through the clearance hole.

[0007] Because the button and crank are circumferentially fixed and do not rotate, when a thicker pencil tip is needed, the user simply moves the lever to rotate the adjustment dial. This, in turn, pushes the button forward under the action of the guide structure. The button rests against the push rod, causing the push rod to move forward along with the button. When a lead breaks during pencil sharpening, the user simply presses the button forward, which directly pushes the push rod forward to remove the broken lead.

[0008] In the tip thickness adjustment mechanism of this hand-cranked pencil sharpener, the button is circumferentially fixed to the crank handle, and a rotatable adjustment disc is added inside the handle. The button's circumferential fixation prevents further rotation and thus avoids changing the pre-adjusted tip thickness when the button is pressed to remove the lead. The added adjustment disc replaces the button, allowing the user to adjust the tip thickness by rotation. This eliminates the reliance on the button for both tip thickness adjustment and lead removal, preventing uncontrolled button rotation during lead removal and improving reliability. Furthermore, a lever protrudes directly from the side of the adjustment disc, and an arc-shaped clearance hole is provided on the side of the crank handle, allowing direct rotation of the adjustment disc without the need for additional operating components.

[0009] In the above-mentioned hand-cranked pencil sharpener's tip thickness adjustment mechanism, the crank includes a handle body with a concave cavity on the rear side and a cover body fixedly connected to the concave cavity. The clearance hole is formed after the cover body is fixed in the concave cavity. The rear side of the cover body has a non-circular through hole. The button passes through the through hole and the shape of the button matches the through hole.

[0010] The crank handle is configured to include a handle body with a recessed cavity on the rear side and a cover body fixedly connected to the recessed cavity. The positioning hole is formed after the cover body is fixed to the recessed cavity, so that the adjustment disc can be inserted into the crank handle and the lever can be extended out of the crank handle for user operation.

[0011] The button passes through a non-circular through hole, and the shape of the button matches the through hole. This allows the button to be circumferentially fixed to the handle, thus ensuring that there is no rotation when the button is pressed forward to push out the break core.

[0012] In the above-mentioned pen tip thickness adjustment mechanism of a hand-cranked pencil sharpener, the cover body has an annular flange arranged around the through hole, and the adjustment disc is sleeved on the outside of the annular flange.

[0013] The above setup supports the adjustment dial, ensuring its stable rotation and reliable adjustment of the pen tip thickness.

[0014] In the above-mentioned hand-cranked pencil sharpener's tip thickness adjustment mechanism, the side of the handle body is provided with a notch communicating with the cavity, and the rear edge of the cover body is provided with an arc-shaped protrusion. The protrusion is located inside the notch, and the clearance hole is surrounded by the inner wall of the notch and the protrusion. Several indicator marks are provided on the protrusion along the circumferential direction.

[0015] In the above-mentioned pen tip thickness adjustment mechanism of a hand-cranked pencil sharpener, the guide structure includes an arc-shaped functional part located on the adjustment plate and a protruding head protruding from the side of the button. The functional part is concentrically arranged with the button, and a guide slope is provided on the front side of the functional part, with the protruding head abutting against the guide slope.

[0016] The protruding head rests against the first guide slope, which has a slope. When the adjustment dial is rotated, the first guide slope will move along the protruding head, thereby forcing the button to move forward to adjust the pen tip thickness.

[0017] In the above-mentioned hand-cranked pencil sharpener's tip thickness adjustment mechanism, as another technical solution, the guide structure includes an annular part protruding from the side of the button and an abutting part on the adjustment plate. The rear side of the annular part is provided with an arc-shaped guide slope two, which abuts against the abutting part.

[0018] The second guide slope rests against the support part. The second guide slope is sloped, so when the adjustment dial is rotated, the support part will move along the second guide slope, thereby forcing the button to move forward to adjust the pen tip thickness.

[0019] In the above-mentioned pen tip thickness adjustment mechanism of a hand-cranked pencil sharpener, a pen-blocking block is slidably connected to the blade holder in the front-back direction, a slot is provided on the front side of the push rod, and a locking block is provided on the rear side of the pen-blocking block, with the locking block located in the slot.

[0020] Similar to existing methods, in this application, the thickness of the pencil tip is also determined by the position of the pencil stop block; that is, the pencil lead stops sharpening after it comes into contact with the pencil stop block. Similarly, since the pencil tip contacts the pencil stop block, in practice, the broken lead is pushed away by the forward movement of the pencil stop block.

[0021] In the current design, the pencil stop block simply rests against the push rod. After the lead breaks and is ejected, the push rod returns to its original position, and the pencil stop block is pushed back by the tip of the pencil being sharpened during subsequent sharpening. However, the feeding of the pencil being sharpened relies on friction. If the pencil stop block gets stuck, it is difficult to push it back using friction alone.

[0022] Therefore, this pen tip thickness adjustment mechanism has a slot on the front side of the push rod and a locking block on the rear side of the pen stop block. The locking block is located in the slot, so that the push rod and the pen stop block are linked in the front and back direction. In this way, after the broken core is pushed out, the spring force of the return spring can force the pen stop block back to the initial position, avoiding the pen stop block from being stuck and unable to return to its original position smoothly.

[0023] Compared with existing technologies, this hand-cranked pencil sharpener features a button that is circumferentially fixed to the handle, with a rotating adjustment disc added inside the handle. The button's circumferential fixation prevents further rotation and thus avoids altering the pre-adjusted pencil tip thickness when the button is pressed to break the lead. The added adjustment disc replaces the button, allowing the user to rotate it to adjust the pencil tip thickness. This eliminates the need for buttons to handle both tip thickness adjustment and lead breaking, preventing uncontrolled button rotation during lead breaking and thus improving reliability.

[0024] Furthermore, the adjustment disc has a lever protruding directly on its side, and an arc-shaped clearance hole is provided on the side of the crank handle, so that the adjustment disc can be rotated directly without the need to connect other operating parts. Attached Figure Description

[0025] Figure 1 This is a cross-sectional view of the pencil tip adjustment mechanism of this hand-cranked pencil sharpener.

[0026] Figure 2 This is a 3D schematic diagram of the pencil tip adjustment mechanism of this hand-cranked pencil sharpener.

[0027] Figure 3 This is an exploded view of the crank handle.

[0028] Figure 4 This is a breakdown diagram of the crank handle from another angle.

[0029] Figure 5This is a schematic diagram showing the interaction between the buttons and the adjustment dial.

[0030] Figure 6 This is a 3D schematic diagram of the adjustment dial.

[0031] Figure 7 This is a schematic diagram of the connection between the tool body and the tool holder.

[0032] Figure 8 This is a disassembled diagram of the tool body and the tool holder.

[0033] In the diagram, 1. Knife holder; 1a. Pen holder hole; 1b. Mounting hole; 1c. Guide hole; 1d. Block; 1e. Locking block; 2. Crank handle; 2a. Clearance hole; 2b. Handle body; 2b1. Cavity; 2b2. Notch; 2b3. Insertion hole; 2b4. Socket hole; 2b5. Protrusion; 2b6. Stop block one; 2b7. Stop block two; 2c. Cover body; 2c1. Through hole; 2c2. Protrusion; 2c3. 1. Annular flange; 2c4. Pin; 3. Mounting base; 3a. Internal gear ring; 4. Hob; 5. Gear; 6. Push rod; 6a. Shoulder; 6b. Slot; 7. Button; 7a. Protrusion; 8. Return spring; 9. Pen block; 9a. Locking block; 10. Adjustment disc; 10a. Lever; 10b. Actuating part; 10b1. Guide slope; 10b2. Positioning groove; 10b3. Limiting block. Detailed Implementation

[0034] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0035] Example 1

[0036] like Figure 1 and Figure 2 As shown, a pencil tip adjustment mechanism for a hand-cranked pencil sharpener includes a blade holder 1 and a crank handle 2 fixedly connected to the rear end of the blade holder 1. A mounting base 3 is also fitted onto the rear end of the blade holder 1, allowing it to be fixed to the casing of the hand-cranked pencil sharpener. In practice, the mounting base 3 has an internal gear ring 3a through which the blade holder 1 passes. The front end of the blade holder 1 has a through-hole 1a along the front-rear direction, and the side of the hole 1a has a clearance hole 2a. A roller cutter 4 is connected to the blade holder 1, with part of the roller cutter 4 located within the clearance hole 2a. A gear 5 is fixedly connected to the rear end of the roller cutter 4, meshing with the inner side of the internal gear ring 3a. When sharpening the pencil, the pencil is inserted into the hole 1a of the blade holder 1, and then the crank handle 2 is cranked. The crank handle 2 rotates the blade holder 1, causing the gear 5 to move along the internal gear ring 3a and rotate, thus rotating the roller cutter 4 and sharpening the pencil.

[0037] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, this pen tip thickness adjustment mechanism includes a push rod 6 passing through the rear end of the blade holder 1, a button 7 mounted on the crank handle 2, a return spring 8 sleeved on the push rod 6, and a pen-stopping block 9 slidably connected to the blade holder 1 in the front-to-back direction. The pen-stopping block 9 is located behind the pen release hole 1a. The push rod 6 abuts against the button 7 under the action of the return spring 8. The button 7 is circumferentially fixed to the crank handle 2. The crank handle 2 has a rotatable adjustment disc 10. The button 7 passes through the adjustment disc 10. A guide structure is provided between the button 7 and the adjustment disc 10. When the adjustment disc 10 rotates, it can push the button 7 forward through the guide structure. The side of the crank handle 2 has an arc-shaped clearance hole 2a. The side of the adjustment disc 10 has a protruding lever 10a. The lever 10a passes through the clearance hole 2a and out of the crank handle 2. In this embodiment, the guide structure includes an arc-shaped functional part 10b disposed on the adjustment disk 10 and a protruding head 7a protruding from the side of the button 7. The functional part 10b is concentrically disposed with the button 7. A guide slope 10b1 is provided on the front side of the functional part 10b, and the protruding head 7a abuts against the guide slope 10b1. A plurality of positioning grooves 10b2 are provided on the guide slope 10b1, and limiting blocks 10b3 protruding from the guide slope 10b1 are respectively provided at both ends of the arc of the front side of the functional part 10b. The positioning protruding head 7a is locked in the positioning groove 10b2 so that the position of the button 7 after being pushed by the adjustment disk 10 can be fixed, so as to ensure that the adjustment disk 10 will not rotate uncontrollably during the pencil sharpening process; while the setting of the two limiting blocks 10b3 limits the rotation angle of the adjustment disk 10, preventing the adjustment disk 10 from rotating excessively and causing the guide slope 10b1 to completely separate from the protruding head 7a. Furthermore, there are two protrusions 7a, which are symmetrically arranged, and there are two corresponding action parts 10b. The front side of each action part 10b is provided with a guide slope 10b1.

[0038] Specifically, such as Figure 3 and Figure 4As shown, the crank handle 2 includes a handle body 2b with a recess 2b1 on the rear side and a cover body 2c fixedly connected to the recess 2b1. A clearance hole 2a is formed after the cover body 2c is fixed inside the recess 2b1. The rear side of the cover body 2c has a non-circular through hole 2c1 through which the button 7 passes, and the shape of the button 7 matches the through hole 2c1. The through hole 2c1 is actually an internal hexagonal hole. The side of the handle body 2b has a notch 2b2 communicating with the recess 2b1. The rear edge of the cover body 2c has an arc-shaped protrusion 2c2 located inside the notch 2b2. The clearance hole 2a is formed by the inner wall of the notch 2b2 and the protrusion 2c2. Several indicator marks are provided circumferentially on the protrusion 2c2. The cover body 2c has an annular flange 2c3 surrounding the through hole 2c1, and the adjustment disc 10 is sleeved on the annular flange 2c3. The bottom wall of the cavity 2b1 is provided with at least two insertion holes 2b3, and the front side of the cover 2c is provided with at least two prongs 2c4. The front end of each prong 2c4 passes through the corresponding insertion hole 2b3 and is fastened to the front side of the handle 2b.

[0039] like Figure 7 and Figure 8 As shown, the front side of the body 2b is provided with a socket 2b4, which communicates with the cavity 2b1. Two arc-shaped protrusions 2b5 protrude from the wall of the socket 2b4, forming an arc-shaped relief groove between adjacent ends of the protrusions 2b5. The rear end of the tool holder 1 is columnar, and the side of the tool holder 1 is provided with an annular blocking part 1d and two arc-shaped locking blocks 1e. The two locking blocks 1e are symmetrically distributed, with the blocking part 1d located in front of the locking blocks 1e. The curvature of the locking blocks 1e matches the curvature of the relief groove, and the circumferential angle between the two locking blocks 1e is the same as the circumferential angle between the two relief grooves. A stop block 2b6 and a stop block 2b7 protrude from the rear side of the protrusion 2b5 at both ends of its arc. One locking block 1e is located between the stop blocks 2b6 and 2b7 on the rear side of one of the protrusions 2b5, and the other locking block 1e is located between the stop blocks 2b6 and 2b7 on the rear side of the other protrusion 2b5. The body 2b is axially positioned between the blocking part 1d and the locking block 1e. In this embodiment, the thickness of the stop block 2b6 gradually decreases from the end closest to the stop block 2b7 towards the other end. When connecting the crank handle 2 to the tool holder 1, the two locking blocks 1e at the rear end of the tool holder 1 are passed through the two clearance slots respectively, and then the tool holder 1 is rotated. Because the thickness of the first stop 2b6 gradually decreases from the end closest to the second stop 2b7 towards the other end, as the tool holder 1 rotates, the locking block 1e can squeeze past the first stop 2b6 and lock between the first stop 2b6 and the second stop 2b7, thereby fixing the tool holder 1 and the crank handle 2 together.

[0040] Furthermore, such as Figure 1As shown, the rear end of the tool holder 1 is provided with a mounting hole 1b and a guide hole 1c in sequence. The front end of the push rod 6 passes through the mounting hole 1b and the guide hole 1c in sequence, and the push rod 6 is circumferentially fixed to the tool holder 1 through the guide hole 1c. The push rod 6 has a shoulder 6a near the rear end, and the two ends of the return spring 8 abut against the wall of the mounting hole 1b and the shoulder 6a, respectively. The front end side of the push rod 6 is provided with a groove 6b, and the rear end side of the pen block 9 is provided with a locking block 9a, which is located in the groove 6b.

[0041] During installation, first place the adjustment disc 10 inside the cover 2c, and then fit the adjustment disc 10 over the annular flange 2c3 of the cover 2c. Next, pass the button 7 through the through hole 2c1 of the cover 2c and make the protrusion 7a of the button 7 abut against the guide slope 10b1 of the actuating part 10b. Finally, fix the cover 2c in the cavity 2b1 of the handle 2b. Specifically, the front ends of each pin 2c4 of the cover 2c pass through the insertion holes 2b3 on the bottom wall of the cavity 2b1 and are fastened to the front side of the handle 2b. After the cover 2c and the handle 2b are fixedly connected together to form the crank handle 2, fix the crank handle 2 to the rear end of the tool holder 1. The rear end of the push rod 6 will abut against the front end of the button 7.

[0042] Taking the positioning notch at the lowest position of the protrusion 7a on the guide slope 10b1 as an example, the distance between the pencil stop block 9 and the pencil release hole 1a is the farthest at this point, resulting in the finest pencil tip. To make the pencil tip thicker, the user simply moves the lever 10a to rotate the adjustment dial 10. This causes the guide slope 10b1 to move along the protrusion 7a, forcing the button 7 forward. The push rod 6, which abuts against the button 7, moves the pencil stop block 9 forward with it. When a lead breaks during pencil sharpening, the user simply presses the button 7 forward. The button 7 directly pushes the push rod 6 forward, causing the pencil stop block 9 to move forward and push out the broken lead. After the force of pressing the button 7 is released, the push rod 6 resets under the action of the return spring 8, pushing the button 7 back to its original position. The pencil stop block 9, which is linked to the push rod 6 via the locking block 1e and the locking groove 6b, also returns to its initial position along with the push rod 6.

[0043] In the pencil tip thickness adjustment mechanism of this hand-cranked pencil sharpener, button 7 is circumferentially fixed to the crank handle 2, and a rotatable adjustment disc 10 is added inside the crank handle 2. The circumferential fixation of button 7 to the crank handle 2 ensures that when button 7 is pressed to remove the lead, it will not rotate and change the already adjusted pencil tip thickness. The added adjustment disc 10 replaces button 7 for the user to rotate to adjust the pencil tip thickness. This means that pencil tip thickness adjustment and lead removal no longer rely solely on button 7, avoiding the situation where the adjusted pencil tip thickness changes due to the uncontrolled rotation of button 7 during lead removal, thus improving the reliability of use.

[0044] Example 2

[0045] The structure and principle of this embodiment are basically the same as those of Embodiment 1. The difference is that in this embodiment, the guide structure includes an annular part protruding from the side of the button 7 and an abutting part provided on the adjustment plate 10. The rear side of the annular part is provided with an arc-shaped guide slope II, which abuts against the abutting part.

[0046] The second guide slope rests against the abutting part. The second guide slope is sloped, so when the adjustment dial 10 is rotated, the abutting part will move along the second guide slope, thereby forcing the button 7 to move forward to adjust the pen tip thickness.

[0047] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A hand-operated pencil sharpener with a lead point thickness adjusting mechanism, the hand-operated pencil sharpener comprising a holder (1) and a handle (2) fixedly connected to the rear end of the holder (1), the lead point thickness adjusting mechanism comprising a push rod (6) arranged in the rear end of the holder (1), a button (7) arranged on the handle (2) and a return spring (8) sleeved on the push rod (6), the push rod (6) being abutted against the button (7) under the action of the return spring (8), characterized in that, The button (7) is circumferentially fixed with the handle (2), the handle (2) is internally provided with a rotatable adjusting disc (10), the button (7) passes through the adjusting disc (10), a guide structure is arranged between the button (7) and the adjusting disc (10), the button (7) can be pushed to move forward through the guide structure when the adjusting disc (10) rotates, the side of the handle (2) is provided with an arc-shaped accommodation hole (2a), the side of the adjusting disc (10) is provided with a protruding lever (10a), and the lever (10a) passes out of the handle (2) from the accommodation hole (2a).

2. A mechanism for adjusting the thickness of a pencil lead according to claim 1, wherein The handle (2) includes a handle body (2b) provided with a concave cavity (2b1) at the rear side and a cover body (2c) fixedly connected in the concave cavity (2b1), the accommodation hole (2a) is formed after the cover body (2c) is fixed in the concave cavity (2b1), the rear side of the cover body (2c) is provided with a non-circular through hole (2c1), and the button (7) passes through the through hole (2c1) and the shape of the button (7) is matched with the through hole (2c1).

3. A mechanism for adjusting the thickness of the pencil lead according to claim 2, wherein The cover body (2c) is internally provided with an annular flange (2c3) arranged around the through hole (2c1), and the adjusting disc (10) is sleeved outside the annular flange (2c3).

4. A mechanism for adjusting the thickness of a pencil lead according to claim 3, wherein The side of the handle body (2b) is provided with a notch (2b2) in communication with the concave cavity (2b1), the rear side edge of the cover body (2c) is provided with an arc-shaped tab (2c2), the tab (2c2) is located in the notch (2b2), the accommodation hole (2a) is surrounded by the inner wall of the notch (2b2) and the tab (2c2), and a plurality of indication marks are arranged on the tab (2c2) in the circumferential direction.

5. A mechanism for adjusting the thickness of the pencil lead according to claim 1 or 2 or 3 or 4, wherein The guide structure includes an arc-shaped acting portion (10b) arranged on the adjusting disc (10) and a protruding head (7a) arranged on the side of the button (7), the acting portion (10b) is concentrically arranged with the button (7), and the front side of the acting portion (10b) is provided with a guide slope one (10b1), and the protruding head (7a) abuts against the guide slope one (10b1).

6. A mechanism for adjusting the thickness of the pencil lead according to claim 1 or 2 or 3 or 4, wherein The guide structure includes a ring-shaped portion arranged on the side of the button (7) and an abutting portion arranged on the adjusting disc (10), the rear side of the ring-shaped portion is provided with an arc-shaped guide slope two, and the guide slope two abuts against the abutting portion.

7. A mechanism for adjusting the thickness of the pencil lead according to claim 1 or 2 or 3 or 4, wherein The pencil stopper (9) is slidably connected to the holder (1) in the front-rear direction, the front end side of the push rod (6) is provided with a clamping groove (6a), the rear end side of the pencil stopper (9) is provided with a clamping block (9a), and the clamping block (9a) is located in the clamping groove (6a).

Images