Pen point thickness multi-stage adjusting device of pencil sharpener

Abstract

The utility model relates to the field of pencil sharpeners, in particular to a pencil point thickness multi-stage adjusting device of a pencil sharpener, which is characterized in that a cutter group, an inner gear, an adjusting mechanism and a rocking handle are matched for use, and a driving ring and a gear shaft sleeve in the adjusting mechanism are matched for use; the position, relative to the pencil inlet hole, of the adjusting column of the adjusting rod is limited through the tooth grooves with different depths, so that the pencil point thickness degree of pencil sharpening is controlled, multi-stage adjustment control over pencil point thickness adjustment is achieved, meanwhile, the first through hole is formed in the knife rest, and the problem that a broken lead is not prone to falling out is solved.

Description

Technical Field

[0001] The utility model relates to the field of pencil sharpeners, in particular to a multi-stage adjusting device for the thickness of the tip of a pencil sharpener. Background Art

[0002] The disclosed straight-push two-stage adjusting mechanism for the thickness of the tip of a pencil sharpener and the pencil sharpener (patent number: 201721693709.X) achieve a clever cooperation among a button, a guide sleeve and a guide rod. The button is pressed by the user's hand, and by pressing the button, the guide rod can reach two positions in the axial direction. That is, the position in the first state is the position when the tip of the pencil is thinner; the position in the second state is the position when the tip of the pencil is thicker. The position where the push rod extends into the cutter head defines the thickness of the tip of the pencil after cutting. The guide rod is fixed to the push rod that can define the thickness of the tip of the pencil, so as to meet the two-stage requirements of the tip of the pencil, namely the thicker tip gear and the thinner tip gear, in the way of directly pushing the button. This design provides a choice of two gears, thinner and thicker, but it cannot perform multi-stage adjustment of the tip thickness according to task requirements or the environment. In addition, if the pencil lead breaks inside the cutter head during sharpening, it will be relatively difficult to take out. Summary of the Utility Model

[0003] In order to solve the above defects, the utility model provides a multi-stage adjusting device for the thickness of the tip of a pencil sharpener, which solves the problem that the pencil sharpener only has two choices of thinner and thicker gears and cannot perform multi-stage adjustment according to needs.

[0004] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0005] A multi-stage adjusting device for the thickness of the tip of a pencil sharpener includes a cutter group, an internal gear, an adjusting mechanism and a crank. The cutter group includes a cutter head, a hob and a connecting shaft for fixing the hob to the cutter head. The bottom of the cutter head is provided with a first through hole for chip breaking and falling out. The cutter head is also provided with a second through hole for the adjusting mechanism to pass through. One end outer wall of the cutter head is provided with a thread and is threadedly connected with the crank. The interior is provided with a cavity, which is communicated with the second through hole. Two grooves are provided on the inner wall of the cavity;

[0006] The adjusting mechanism is arranged inside the cavity and includes a return spring, an adjusting rod, an adjusting wheel, a blocking block, and an adjusting knob. The adjusting rod includes an adjusting column and a driving ring connected in sequence. Two convex strips are oppositely arranged on the circumferential surface of the driving ring, and a driving claw is vertically and fixedly arranged on the circumferential end surface. A cylindrical surface is provided at the end of the driving claw. The adjusting wheel includes a gear shaft sleeve, a limiting block, and a square shaft. The gear shaft sleeve is in the shape of a hollow cylinder, with one end fixed to the limiting block and the other end surface being in the shape of an arc sawtooth. The depth of the tooth grooves of the gear shaft sleeve increases and then decreases in sequence along the circumferential direction, and the depths of the tooth grooves at both ends of the diameter of the gear shaft sleeve are the same.

[0007] Further, the driving claws are arranged in pairs at both ends of the diameter of the driving ring.

[0008] Further, the gear shaft sleeve is used in cooperation with the driving claw, and the cylindrical surface of the driving claw abuts against the tooth groove of the gear shaft sleeve.

[0009] Further, the number of tooth grooves of the gear shaft sleeve is at least 4 or more and is an even number.

[0010] Further, the limiting column is used in cooperation with the adjusting wheel. The limiting column is inserted into the adjusting wheel and is rotatably connected.

[0011] Further, the size and shape of the second through hole match the adjusting column of the adjusting rod for the adjusting column to pass through the second through hole and be slidably connected.

[0012] Further, the groove is used in cooperation with the convex strip to limit the driving ring from generating axial rotation. The front end of the convex strip is reduced to a triangular shape for easy insertion into the groove.

[0013] Further, a square opening is provided at one end of the adjusting knob to accommodate the insertion of the square shaft and drive the adjusting wheel to rotate.

[0014] Further, the blocking block is used to limit the adjusting mechanism inside the cavity.

[0015] The beneficial effects of adopting the above technical solutions are as follows:

[0016] 1. By setting the cooperation of the cutter group, the internal gear, the adjusting mechanism, and the crank, and using the cooperation of the driving ring and the gear shaft sleeve in the adjusting mechanism, the relative position of the adjusting column of the adjusting rod is limited by tooth grooves of different depths, so as to control the thickness of the pencil tip during cutting and realize multi-level adjustment control of the thickness of the pencil tip.

[0017] 2. By providing a second through hole at the bottom of the tool rest, after the core is broken during the tip cutting, it is convenient for the broken core to fall from the second through hole, solving the problem of the broken core jamming the cutter group. Brief Description of the Drawings

[0018] Figure 1 is a schematic structural diagram of an embodiment of the present utility model;

[0019] Figure 2 is an exploded view of the structure of an embodiment of the present utility model;

[0020] Figure 3 is an exploded view of the structure of the cutter group in an embodiment of the present utility model;

[0021] Figure 4 is an exploded view of the structure of the cutter group from another angle in an embodiment of the present utility model;

[0022] Figure 5 is an exploded view of the structure of the adjusting mechanism in an embodiment of the present utility model;

[0023] Figure 6 is an exploded view of the structure of the adjusting rod in an embodiment of the present utility model;

[0024] Figure 7 is an exploded view of the structure of the adjusting wheel in an embodiment of the present utility model.

[0025] Reference Numerals

[0026] 1. Cutter group; 11. Tool holder; 111. First through hole; 112. Second through hole; 113. Cavity; 1131. Groove; 12. Hob; 13. Connecting shaft; 2. Internal gear; 3. Adjusting mechanism; 31. Return spring; 32. Adjusting rod; 321. Adjusting column; 322. Driving ring; 3231. Rib; 3222. Driving claw; 32221. Cylindrical surface; 33. Adjusting wheel; 331. Gear shaft sleeve; 3311. Tooth groove; 332. Limit stop; 333. Square shaft; 34. Blocking block; 35. Adjusting knob; 4. Crank. Detailed Description of the Preferred Embodiments

[0027] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0028] As Figures 1 to 7As shown in the figure, a multi-level adjustment device for the tip thickness of a pencil sharpener includes a cutter group, an internal gear, an adjustment mechanism, and a crank. The cutter group includes a cutter holder, a hob, and a connecting shaft for fixing the hob to the cutter holder. A first through hole for chip breaking and falling out is provided at the bottom of the cutter holder. A second through hole through which the adjustment mechanism passes is also provided on the cutter holder. One end outer wall of the cutter holder is provided with a thread and is threadedly connected to the crank. A cavity is provided inside and is connected to the second through hole. Two grooves are provided on the inner wall of the cavity. The adjustment mechanism is arranged inside the cavity and includes a return spring, an adjustment rod, an adjustment wheel, a blocking block, and an adjustment knob. The adjustment rod includes an adjustment column and a driving ring connected in sequence. Two convex strips are oppositely arranged on the circumferential surface of the driving ring, and a driving claw is vertically and fixedly arranged on the circumferential end surface. The end of the driving claw is provided with a cylindrical surface. The adjustment wheel includes a gear shaft sleeve, a limiting block, and a square shaft. The gear shaft sleeve is in the shape of a hollow cylinder. One end is fixed on the limiting block, and the other end surface is in the shape of an arc sawtooth. The depth of the tooth grooves of the gear shaft sleeve increases and then decreases in sequence along the circumferential direction, and the depths of the tooth grooves at both ends of the diameter of the gear shaft sleeve are the same.

[0029] With the above technical solution, by setting the combined use of the cutter group 1, the internal gear 2, the adjustment mechanism 3, and the crank 4, when the crank 4 is rotated, the cutter group 1 connected by threads can be controlled to rotate in the internal gear 2, so as to perform cutting work on the pencil inserted into the cutter group 1. When the tip of the pencil touches the adjustment column 321, the pencil no longer continues to enter, and the cutter group 1 cannot cut the pencil, and the cutting work stops. When higher requirements are placed on the thickness accuracy of the pencil tip, only the position of the adjustment column 321 relative to the cutter holder 11 needs to be adjusted to adjust the thickness of the tip. When the adjustment column 321 is closer to the pen inlet hole, the tip is thicker, and when it is farther from the pen inlet hole, the tip is thinner. Therefore, only by rotating the adjustment knob 35, using the insertion connection of the square shaft 333, the adjustment wheel 33 is driven to rotate, and the gear shaft sleeve 331 fixed on the adjustment wheel 33 rotates accordingly. The rotation of the gear shaft sleeve 331 can force the driving claw 3222 in contact with it to perform axial movement, thereby forcing the adjustment rod 32 to also perform axial movement, and then adjusting the position of the adjustment column 321 relative to the cutter holder. Under the pressure of the return spring 31, the driving claw 3222 is forced to abut against the tooth groove 3311 of the gear shaft sleeve 331, and the position of the adjustment column 321 is fixed after being stuck. Because the depths of the tooth grooves 3311 are different, the positions where the driving claw 3222 stays axially are also different, resulting in different positions of the adjustment column 321 relative to the cutter holder 11, so as to achieve the effect of multi-level adjustment of the thickness of the pencil tip.

[0030] As Figure 1 、 Figure 2 、 Figure 5 and Figure 6As shown, the driving claws are arranged in pairs at both ends of the diameter of the driving ring.

[0031] With the above technical solution, by arranging the driving claws 3222 in pairs, the stability can be ensured. Of course, in actual application, multiple driving claws 3222 can also be set, and the tooth grooves 3311 of the corresponding gear shaft sleeves 331 are arranged in corresponding groups along the circumferential direction.

[0032] As Figure 5 and Figure 6 shown, the gear shaft sleeve is used in cooperation with the driving claw, and the cylindrical surface of the driving claw abuts against the tooth groove of the gear shaft sleeve.

[0033] With the above technical solution, by arranging the gear shaft sleeve 331 to be used in cooperation with the driving claw 3222, the cylindrical surface 32221 of the driving claw 3222 abuts against the tooth groove 3311 of the gear shaft sleeve 331. The tooth grooves 3311 with different depths can control the driving claw 3222 to be in different positions, so as to achieve the effect of multi-level adjustment of the thickness of the pencil tip.

[0034] As Figure 5 and Figure 6 shown, the number of tooth grooves of the gear shaft sleeve is at least more than 4 and is an even number.

[0035] With the above technical solution, by setting the number of tooth grooves 3311 to be at least more than 4 and being an even number, or more than 2 pairs, at least 2 levels of tip thickness can be achieved.

[0036] As Figure 3 and Figure 4 shown, the size and shape of the second through hole match the adjusting column of the adjusting rod, and are used for the adjusting column to pass through the second through hole and be slidably connected.

[0037] With the above technical solution, by setting the size and shape of the second through hole 112 to allow the adjusting rod 32 to pass through and restrict the rotation of the shaft, it can ensure that the adjusting rod 32 slides axially and ensure the stability of the adjusting rod.

[0038] As Figure 4 and Figure 6 shown, the groove and the rib are used in cooperation to limit the driving ring from generating axial rotation. The front end of the rib is reduced to a triangular shape for convenient insertion into the groove.

[0039] With the above technical solution, by arranging the groove 1131 and the rib 3231 to be used in cooperation, the driving ring can be restricted from generating axial rotation. The front end of the rib 3221 is reduced to a triangular shape, which is convenient for insertion into the groove 1131 during installation.

[0040] As Figure 7As shown, one end of the adjusting knob is provided with a square opening for accommodating the insertion of the square shaft, driving the rotation of the adjusting wheel.

[0041] With the above technical solution, by setting the square opening, it is convenient for the adjusting knob 35 and the adjusting wheel 33 to be closely combined, and the rotation of the adjusting wheel 33 can be driven by the rotation of the adjusting knob 35.

[0042] As Figure 3 and Figure 4 shown, the blocking block is used to limit the adjusting mechanism inside the cavity.

[0043] With the above technical solution, by setting the blocking block 34, the adjusting mechanism 3 can be limited inside the cavity 113, increasing the stability of installation and ensuring the quick and convenient installation.

[0044] Working principle

[0045] Install the entire device in the order of Figure 2 Rotate the crank handle, which can control the rotation of the cutter set connected by threads in the internal gear, so as to perform the cutting work on the pencil inserted into the cutter set. When the tip of the pencil touches the adjusting column, the pencil no longer continues to enter, and the cutter set cannot cut the pencil, and the cutting work stops; when higher requirements are placed on the thickness accuracy of the tip of the pencil, only by adjusting the position of the adjusting column relative to the tool holder can the thickness accuracy of comparison be adjusted. When the adjusting column is closer to the pen inlet hole, the tip is thicker, and when it is farther from the pen inlet hole, the tip is thinner. Therefore, only by rotating the adjusting knob and using the insertion connection of the square shaft to drive the rotation of the adjusting wheel, the gear shaft sleeve fixed on the adjusting wheel rotates accordingly. The rotation of the gear shaft sleeve can force the driving claw in contact with it to move axially, thereby pushing the adjusting rod to also move axially, and further adjusting the position of the adjusting column relative to the tool holder; under the pressure of the return spring, the driving claw is forced to abut against the tooth groove of the gear shaft sleeve, and the position of the adjusting column is fixed after being stuck; because the depths of the tooth grooves are different, the positions where the driving claws stay axially are also different, resulting in different positions of the adjusting column relative to the tool holder, so that the effect of multi-stage adjustment of the thickness of the tip of the pencil can be achieved.

[0046] In the present invention, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or simply means that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or simply means that the first feature has a lower horizontal height than the second feature.

[0047] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0048] As described above, it is only the preferred specific implementation manner of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model, according to the technical solution of the present utility model and the inventive concept thereof, makes equivalent substitutions or changes, and should be covered within the protection scope of the present utility model.

Claims

1. A multi - level adjusting device for the tip thickness of a pencil sharpener, characterized in that: It includes a cutter set (1), an internal gear (2), an adjusting mechanism (3) and a crank (4). The cutter set (1) includes a tool holder (11), a hob (12) and a connecting shaft (13) for fixing the hob (12) to the tool holder (11). A first through hole (111) for chip breaking and falling out is provided at the bottom of the tool holder (11). A second through hole (112) through which the adjusting mechanism (3) passes is also provided on the tool holder (11). One end outer wall of the tool holder (11) is provided with a thread and is threadedly connected to the crank (4). A cavity (113) is provided inside and is connected to the second through hole (112). Two grooves (1131) are provided on the inner wall of the cavity (113). The adjusting mechanism (3) is arranged inside the cavity (113) and includes a return spring (31), an adjusting rod (32), an adjusting wheel (33), a blocking block (34) and an adjusting knob (35). The adjusting rod (32) includes an adjusting column (321) and a driving ring (322) connected in sequence. Two convex strips (3221) are oppositely arranged on the circumferential surface of the driving ring (322), and driving claws (3222) are vertically and fixedly arranged on the circumferential end surface. A cylindrical surface (32221) is provided at the end of the driving claw (3222). The adjusting wheel (33) includes a gear shaft sleeve (331), a limiting block (332) and a square shaft (333). The gear shaft sleeve (331) is in the shape of a hollow cylinder, one end is fixed to the limiting block (332), and the other end surface is serrated. The depth of the tooth grooves (3311) of the gear shaft sleeve (331) increases and then decreases in sequence along the circumferential direction, and the depths of the tooth grooves (3311) at both ends of the diameter of the gear shaft sleeve (331) are the same.

2. The multi-level adjustment device for the tip thickness of a pencil sharpener according to claim 1, characterized in that: The driving claws (3222) are arranged in pairs at both ends of the diameter of the driving ring (322).

3. The multi-level adjustment device for the tip thickness of a pencil sharpener according to claim 2, characterized in that: The gear shaft sleeve (331) is used in cooperation with the driving claws (3222), and the cylindrical surface (32221) of the driving claws (3222) abuts against the tooth grooves (3311) of the gear shaft sleeve (331).

4. The multi-level adjustment device for the tip thickness of a pencil sharpener according to claim 3, wherein: The number of the tooth grooves (3311) of the gear shaft sleeve (331) is at least more than 4 and is an even number.

5. The multi-level adjustment device for the tip thickness of a pencil sharpener according to claim 1, wherein: The size and shape of the second through hole (112) are matched with the adjusting column (321) of the adjusting rod (32) for the adjusting column (321) to pass through the second through hole (112) and be slidably connected.

6. The multi-level adjustment device for the tip thickness of a pencil sharpener according to claim 1, characterized in that: The grooves (1131) are used in cooperation with the convex strips (3221) to limit the axial rotation of the driving ring (322). The front end of the convex strip (3221) is reduced to a triangular shape for easy insertion into the grooves (1131).

7. A multi-level adjustment device for the tip thickness of a pencil sharpener according to claim 1, characterized in that: One end of the adjusting knob (35) is provided with a square opening for the square shaft (333) to be inserted into, driving the adjusting wheel (33) to rotate.

8. The multi-level adjustment device for the tip thickness of a pencil sharpener according to claim 1, characterized in that: The blocking block (34) is used to limit the adjusting mechanism (3) inside the cavity (113).

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