Lead pencil feeding mechanism and sharpener suitable for different lead pencil diameters

Abstract

The application discloses a pencil feeding mechanism suitable for pencils with different diameters, which comprises a shell panel with a pencil insertion hole, a base, a pencil clamping wheel assembly and a floating frame. The base comprises a first vertical plate and a second vertical plate, and the first vertical plate and the second vertical plate are respectively provided with a transversely extending waist-shaped hole. The pencil clamping wheel assembly comprises two groups of wheel assemblies, each of which comprises a wheel shaft, a pencil clamping wheel and a transmission gear arranged on the wheel shaft in sequence, and the transmission gear is used for transmitting the power of a pencil sharpening mechanism. The end of the wheel shaft is arranged in the waist-shaped hole and can move transversely in the waist-shaped hole. The floating frame comprises a pressing plate and four pressing shaft seats arranged on the lower side of the pressing plate, and the bottom surface of the pressing shaft seat is provided with an inclined surface. A pencil feeding hole corresponding to the pencil insertion hole is formed in the pressing plate. An elastic member is arranged between the shell panel and the pressing plate. The pencil sharpening mechanism can cut pencils with different diameters and different cross-sectional shapes, and the thickness adjustment can be automatically performed during the process of inserting and pulling out the pencil, so that the thickness adjustment of the mechanism is not necessary, and the operation is convenient and fast.

Description

TECHNICAL FIELD

[0001] The present application relates to a pencil sharpener, in particular to a pencil feeding mechanism in a pencil sharpener, which can be applied to the insertion and clamping of pencils with different outer diameters, so as to enable the pencil sharpener to cut pencils with different outer diameters. BACKGROUND

[0002] The pencil sharpener comprises a housing, a pencil feeding mechanism, a hobbing assembly, etc., the hobbing assembly is manually or electrically driven to rotate, a pencil is inserted from the direction of the pencil feeding mechanism, the pencil is cut by the hobbing assembly, and the generated pencil shavings fall into a shavings collecting box below the hobbing assembly.

[0003] The pencil feeding device of the pencil sharpener disclosed in the authorized announcement No. CN205112787U comprises a support and two sets of support assemblies arranged on the support, a pinion shaft is arranged on the support assembly, and a transmission assembly is sleeved on the pinion shaft, the transmission assembly comprises a rubber roller and a clamping wheel.

[0004] The pencil feeding device of the automatic pencil sharpener disclosed in the authorized announcement No. CN204055099U comprises a support, a driving wheel, and two mounting shafts connected to the support, a gear and a roller are sequentially sleeved on the two mounting shafts, the gears on the two mounting shafts are centrally symmetrical, the gears are engaged with a rack on the driving wheel, and the roller and the gear are gap-fitted with the mounting shafts.

[0005] The automatic pencil feeding mechanism suitable for pencils of any specification disclosed in the authorized announcement No. CN105291667B of the applicant comprises a support, two mounting shafts arranged in parallel and at intervals, two pencil feeding wheels, and a driving mechanism for driving the two mounting shafts to rotate, the pencil feeding mechanism further comprises a spacing adjustment assembly for driving the first mounting shaft to move in a first slot and the second mounting shaft to move in a second slot; the pencil feeding hole can be adaptively adjusted according to the specification of the pencil, and the automatic pencil feeding mechanism is suitable for pencils of any specification.

[0006] The spacing adjustment assembly in the structure can be used to adjust the size of the pencil feeding hole; thus, pencils with different outer diameters can be adapted to, the cross-sectional shape of the pencil is circular, triangular or hexagonal, and the outer diameter here refers to the maximum diameter of the pencil with different cross sections.

[0007] When the above structure is implemented, the applicant has the following technical problems: 1. The size of the pencil feeding hole needs to be manually adjusted by the adjusting rod, which is inconvenient to operate.

[0008] 2. The spacing adjustment assembly has too many structural parts, the assembly is complex, and the stability of the structure is poor. SUMMARY

[0009] The technical problem solved by the present application is to provide a pencil feeding mechanism suitable for different outer diameter pencils, which does not need manual operation and can be self-adaptive after the pencil is inserted, and can be used in a manual pencil sharpener or an electric pencil sharpener.

[0010] The technical solution adopted by the present application to solve the above technical problem is a pencil feeding mechanism suitable for different outer diameter pencils, which comprises a shell panel with a pencil insertion hole, a base, a pencil clamping wheel assembly and a floating frame.

[0011] The base comprises a first vertical plate and a second vertical plate, and the first vertical plate and the second vertical plate are respectively provided with a transversely extending waist-shaped hole.

[0012] The pencil clamping wheel assembly comprises two groups of wheel assemblies, each group of wheel assemblies comprising a wheel shaft, a pencil clamping wheel and a transmission gear arranged in sequence on the wheel shaft, and the transmission gear is used to transmit the power of the pencil sharpener.

[0013] The end of the wheel shaft is placed in the waist-shaped hole and can move transversely in the waist-shaped hole.

[0014] The floating frame comprises a pressing plate and four pressing shaft seats arranged on the lower side of the pressing plate, and the bottom surface of the pressing shaft seat is provided with an inclined surface.

[0015] The pressing plate is provided with a pencil feeding hole corresponding to the pencil insertion hole; and at least one elastic member is arranged between the shell panel and the pressing plate.

[0016] In the first state, the floating frame is pressed against the wheel shaft by the elastic member; the two wheel shafts move to the inside of the waist-shaped hole, at this time the wheel shafts are pressed against the first position of the inclined surface, and the distance between the two wheel shafts is L1.

[0017] In the second state, the wheel shafts move to the outside of the waist-shaped hole; the distance between the two wheel shafts is L2, the wheel shafts are pressed against the second position of the inclined surface, at this time the floating frame moves upward to the compressed elastic member, and L2 is greater than L1.

[0018] The further preferred technical solution of the present application is that the pencil feeding mechanism suitable for different outer diameter pencils further comprises a transmission rod and a dial plate.

[0019] The transmission rod comprises a worm and a first gear arranged coaxially;

[0020] The dial plate comprises a connecting sleeve connected with the knife holder and a second gear;

[0021] The transmission gear is engaged with the worm, and the first gear and the second gear are engaged.

[0022] The further preferred technical scheme of the present application is that the elastic member is two or four, and the elastic member is a spring.

[0023] The guiding structure comprises a guiding column arranged on the inner side of the housing panel and a guiding hole arranged on the pressing plate, the guiding column penetrates into the guiding hole, so that the floating frame can move relatively with respect to the housing panel.

[0024] The further preferred technical scheme of the present application is that the base is provided with a positioning structure for mounting the transmission rod.

[0025] The further preferred technical scheme of the present application is that the inclined surface is an inwardly recessed inner bracket surface, and the curvature of the inner bracket surface is continuous.

[0026] The end of the wheel shaft comprises an inner end in contact with the inclined surface and an outer end extending into the waist-shaped hole, and the diameter of the inner end is greater than that of the outer end.

[0027] The further preferred technical scheme of the present application is that the first position of the inclined surface is higher than the second position, and in the process that the wheel shaft moves from the first position to the second position, the floating frame is floated upward, and the elastic member is compressed.

[0028] The further preferred technical scheme of the present application is that the outer side of the pressing plate of the floating frame is provided with a plurality of accommodating grooves corresponding to the number of springs, and the springs are vertically accommodated in the accommodating grooves.

[0029] The further preferred technical scheme of the present application is that after the floating frame and the base are assembled, the two pressing shaft seats on the first side are located inside the first vertical plate, and the two pressing shaft seats on the second side are located inside the second vertical plate.

[0030] And the assembled floating frame and the base form an accommodating area for accommodating the pencil clamping wheel assembly.

[0031] The further preferred technical scheme of the present application is that the pressing plate of the floating frame is provided with guiding holes on both sides, the guiding holes are in the same plane as the pressing plate, and the guiding holes protrude outward with respect to the outer edge of the pressing plate.

[0032] The bottom surface of the pressing plate extends downward to form four pressing shaft plates, the inner side of the pressing shaft plate is recessed inward, so that a pair of inner bracket surfaces are formed between the two pressing shaft plates on the same side, and the inner bracket surfaces on the same side are symmetrical and have consistent arc surface tracks.

[0033] In the first state, the wheel shaft is tangent to the first arc segment surface of the inner bracket surface, and in the second state, the wheel shaft is tangent to the second arc segment surface of the inner bracket surface.

[0034] The base further comprises a substrate provided with a through hole, and a first vertical plate and a second vertical plate extending outward from the upper and lower ends of the substrate;

[0035] The first vertical plate is provided with a first waist-shaped hole on both sides, the second vertical plate comprises two connecting rods, and the outer ends of the connecting rods are provided with a second waist-shaped hole, and the outer end of the second waist-shaped hole is open;

[0036] The first vertical plate extends downward to form a positioning plate, and the positioning plate is provided with a first positioning hole, and the substrate is provided with a second positioning hole;

[0037] The first and second positioning holes are on the same straight line, and the transmission rods are distributed and arranged in the first and second positioning holes;

[0038] The second vertical plate comprises

[0039] The transmission gear is transversely engaged with the worm, and the first gear and the second gear are vertically engaged.

[0040] Compared with the prior art, the advantages of the present application are that the pencil feeding mechanism in the embodiment comprises, in sequence from the pencil feeding end, a shell panel, a floating frame, a pencil clamping wheel assembly and a base. The shell panel and the floating frame pressing plate are arranged with elastic members, the four sides of the pressing plate of the floating frame are distributed with pressing shaft seats with inclined surfaces, and the inclined surfaces and the waist-shaped holes opened on the vertical plate of the base are matched with the wheel shafts of the pencil clamping wheel assembly. The wheel shafts are tangent to the inclined surfaces. When a thicker pencil needs to be cut, the wheel shafts arranged in the waist-shaped holes will slide outward to press the inclined surfaces until the wheel shafts lift the floating frame and compress the elastic members. At this time, the pencil clamping wheel assembly will clamp the thicker pencil, and the elastic members will also generate downward pressure on the floating frame, which will relatively press the two wheel shafts inward, thereby clamping the thicker pencil more tightly. That is, the elastic members not only have the function of automatically resetting the floating frame, but also can enhance the clamping stability of the pencil clamping wheel assembly.

[0041] When the thicker pencil is cut, the floating frame will automatically reset under the action of the elastic members. At this time, the two inclined surfaces on the same side relatively push the two wheel shafts inward to move inward, and the clamping distance between the pencil clamping wheel assemblies is reduced, which can be suitable for cutting thinner pencils. The pencil sharpener can cut pencils of different thicknesses and different cross-sectional shapes, and the thickness adjustment can be automatically performed during the insertion and removal of the pencil, without the need for additional adjustment of the thickness mechanism, which is convenient and fast to operate.

[0042] In addition, the vertical plate of the base is provided with a waist-shaped hole to accommodate and guide the wheel shaft to slide left and right, so as to adjust the clamping distance; when the wheel shaft slides, the inclined surface arranged on the floating frame cooperates with the wheel shaft to push the floating frame to lift up, and the elastic member arranged between the shell panel and the floating frame can automatically reset the floating frame. Through simple structure cooperation, the adjustment of the clamping thickness and the automatic reset of the floating frame are realized at the same time, the structure is simple and ingenious, and the internal space of the pencil sharpener is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0043] The application will be described in further detail below in conjunction with the drawings and preferred embodiments, but those skilled in the art will appreciate that the drawings are only drawn for the purpose of explaining the preferred embodiments and therefore should not be regarded as limiting the scope of the application. In addition, unless specifically indicated, the drawings are only intended to conceptually represent the composition or structure of the described object and can include exaggerated display, and the drawings are not necessarily drawn to scale.

[0044] Figure 1 It is an overall structure diagram of the pencil sharpener;

[0045] Figure 2 It is an internal structure diagram of the pencil sharpener;

[0046] Figure 3 It is a structure diagram of the pencil feeding mechanism Figure 1 ;

[0047] Figure 4 It is a structure diagram of the pencil feeding mechanism Figure 2 ;

[0048] Figure 5 It is a side view of the first state of the pencil feeding mechanism Figure 1 ;

[0049] Figure 6 It is a side view of the first state of the pencil feeding mechanism Figure 2 ;

[0050] Figure 7 It is a side view of the first state of the pencil feeding mechanism Figure 3 ;

[0051] Figure 8 It is a side view of the second state of the pencil feeding mechanism Figure 1 ;

[0052] Figure 9 It is a side view of the second state of the pencil feeding mechanism Figure 2 ;

[0053] Figure 10 It is a side view of the second state of the pencil feeding mechanism Figure 3 ;

[0054] Figure 11Structure disassembly of the lead advancing mechanism Figure 1 ;

[0055] Figure 12 Structure disassembly of the lead advancing mechanism Figure 2 ;

[0056] Figure 13 Structure disassembly of the lead advancing mechanism

[0057] Figure 14 Distance between the two axles in the first state

[0058] Figure 15 Distance between the two axles in the second state DETAILED DESCRIPTION

[0059] The preferred embodiments of the present application will be described in detail below with reference to the attached drawings. Those skilled in the art will appreciate that the description is merely descriptive and exemplary, and should not be interpreted as limiting the scope of protection of the present application.

[0060] It should be noted that similar reference numerals represent similar items in the following drawings, and once an item is defined in one drawing, it can not be further defined and explained in subsequent drawings.

[0061] As shown in Figure 1 and Figure 2 , Figure 13 , the pencil sharpener 200 comprises a main body 201, a cutting mechanism 204 accommodated in the main body 201, and a handle mechanism 202. The handle mechanism 202 is connected to the cutting mechanism 204. The handle mechanism is shaken by external force to drive the cutting mechanism 204 to cut the inserted pencil.

[0062] Preferably, the upper region of the main body 201 is used for cutting the pencil, and the lower region of the main body 201 is arranged with a dust collecting box 203 for accommodating the pencil dust generated by the cutting mechanism 204 cutting the pencil.

[0063] More specifically, the main body 201 comprises a main shell g1, a front cover g2, and a rear cover g3. The rear cover g3 covers the rear side of the main shell g1, and the front cover g2 covers the front side of the main shell g1. The three are installed and fixed by means of fasteners, buckle assemblies, and other conventional technical means in the art.

[0064] The dust collecting box 203 is inserted below the main shell g1, and the front cover g2 is located above the dust collecting box 203. The front surface of the front cover g2 is flush with the front surface of the dust collecting box 203, or the front surface of the dust collecting box 203 is recessed backward relative to the front surface of the front cover g2 by a distance.

[0065] Of course, the pencil sharpener 200 in the embodiment can also be an electric pencil sharpener. The electric rotating mechanism is connected with the cutting mechanism 204. When the power drives the electric rotating mechanism to operate, the cutting mechanism 204 will be driven to cut the pencil.

[0066] The embodiment mainly describes the pencil feeding mechanism which can be automatically reset and adjust the clamping gap thickness. The specific implementation is as follows:

[0067] As shown in Figure 3 and Figure 4 , the pencil feeding mechanism 100 suitable for different outer diameter pencils includes a shell panel 10 with a pencil insertion hole 12, a floating frame 40, a pencil clamping wheel assembly 30, and a base 20. The above four technical structures are arranged in sequence along the pencil feeding end.

[0068] Preferably, the longitudinal projection area range of the above four technical structures is equivalent, so that the overall size of the pencil feeding mechanism 100 is equivalent to and coordinated with the preset main body cavity size.

[0069] The floating frame 40 and the base 20 form a containing area h containing the pencil clamping wheel assembly 30, which plays a containing role on the one hand, and the cover structure also plays a role in protecting the pencil clamping wheel assembly 30 on the other hand.

[0070] As shown in Figure 11 and Figure 12 , the base 20 includes a first vertical plate 21 and a second vertical plate 22, and the first vertical plate 21 and the second vertical plate 22 are respectively provided with a transversely extending waist-shaped hole v.

[0071] More specifically, the base 20 includes a base plate 25 provided with a through hole 24 and the first vertical plate 21 and the second vertical plate 22 extending outward from the upper and lower ends of the base plate 25. The through hole 24 is provided for the cutter holder 70.

[0072] The first vertical plate 21 is provided with a first waist-shaped hole v1 on both sides, and the second vertical plate 22 includes two connecting rods 221, and the outer end of the connecting rod 221 is provided with a second waist-shaped hole v2, and the outer end of the second waist-shaped hole v2 is open.

[0073] The outer end of the second waist-shaped hole v2 is open, which can facilitate the wheel shaft c1 to be clamped. Preferably, the inner arc wall of the second waist-shaped hole v2 extends outward by a distance, and the extension is an upwardly curved arc segment. The upwardly curved arc segment can tighten the opening of the second waist-shaped hole v2 to prevent the wheel shaft c1 clamped in the hole from falling out.

[0074] The outer end of the inner side surface of the outer arc wall of the second waist-shaped hole v2 is formed with a downwardly protruding limiting rib, which can prevent the wheel shaft c1 clamped in the hole from falling out.

[0075] The first and second waist-shaped holes v1 and v2 are formed with a longitudinal channel for the wheel shaft c1 to pass through, and the first and second waist-shaped holes are aligned to ensure that the pencil holder wheel assembly 30 can be arranged vertically to better hold the horizontally inserted pencil.

[0076] In addition, the pencil holder wheel assembly 30 in the embodiment includes two groups of wheel assemblies 31. The wheel assembly 31 includes a wheel shaft c1, a pencil holder wheel c2 arranged on the wheel shaft c1 in sequence, and a transmission gear 32 for transmitting the power of the pencil sharpener mechanism.

[0077] The end of the wheel shaft c1 is arranged in the waist-shaped hole v and can move laterally in the waist-shaped hole v. When a thicker pencil is inserted, the wheel assembly 31 is pushed to move outward, and at this time, the wheel shaft c1 moves outward laterally in the waist-shaped hole v. The lateral length of the waist-shaped hole v matches the adjustment range of the diameter of the holding opening.

[0078] As for the floating frame 40, the floating frame 40 includes a pressing plate 41 and four pressing shaft seats 42 arranged on the lower side of the pressing plate 41. The bottom surface of the pressing shaft seat 42 is provided with an inclined surface, the inclined surface is arranged tangentially with the wheel shaft c1, and the wheel shaft c1 can press the inclined surface, thereby driving the floating frame 40 to move outward, and the holding opening becomes larger. Conversely, when the floating frame 40 is reset under the action of the spring f, the inclined surface will press the wheel shaft c1 to move inward, and the holding opening becomes smaller.

[0079] In addition, the pressing plate 41 is provided with a pencil insertion hole 43 corresponding to the pencil insertion hole 12, so that the pencil can be inserted. A plurality of elastic members are arranged between the shell panel 10 and the pressing plate 41, and the elastic member is preferably a spring f. The spring f can automatically reset the floating frame 40.

[0080] In actual operation, as shown in Figure 5 to Figure 7 , in the first state, the floating frame 40 presses the wheel shaft c1 with the inclined curved surface s under the action of the spring f, and the two wheel shafts c1 move inward in the waist-shaped hole v. At this time, the wheel shaft c1 presses the first position r1 of the inclined curved surface s, and the distance between the two wheel shafts c1 is L1. That is, the holding opening formed by the pencil holder wheel assembly 30 is smaller at this time.

[0081] As shown in Figure 8 to Figure 10 , in the second state, the pencil is inserted between the two pencil holder wheels c2 to push the wheel shaft c1 to move outward in the waist-shaped hole v. The distance between the two wheel shafts c1 is L2, and the wheel shaft v1 presses the second position r2 of the inclined curved surface s1. At this time, the floating frame 40 moves upward to be compressed by the spring f, and L2 is greater than L1. That is, the holding opening formed by the pencil holder wheel assembly 30 is larger at this time.

[0082] The advantage of the present application is that the pencil insertion mechanism 100 is sequentially distributed with the shell panel 10, the floating frame 40, the pencil clamping wheel assembly 30 and the base 20 along the pencil insertion end. The elastic member is arranged between the shell panel 10 and the pressing plate 41 of the floating frame 40, and the pressing shaft seat 42 with an inclined surface is distributed on four sides of the pressing plate 41 of the floating frame 40. The inclined surface cooperates with the wheel shaft c1 of the pencil clamping wheel assembly 30 together with the waist-shaped hole v opened on the vertical plate of the base 20; the wheel shaft c1 is tangent to the inclined surface.

[0083] When a thicker pencil needs to be cut, the wheel shaft c1 inserted in the waist-shaped hole v will slide outward to press the inclined surface until the wheel shaft c1 lifts the floating frame 40 and compresses the elastic member. At this time, the pencil clamping wheel assembly 30 will clamp the thicker pencil, and the elastic member will also generate a downward pressure on the floating frame 40 in the opposite direction, so as to relatively press the two wheel shafts c1 inward, thereby clamping the thicker pencil more tightly. That is, the elastic member not only has the function of automatically resetting the floating frame, but also can enhance the clamping stability of the pencil clamping wheel assembly.

[0084] When the thicker pencil is cut, the floating frame 40 will automatically reset under the action of the elastic member, at which time the two inclined surfaces on the same side relatively push the two wheel shafts c1 inward to move inward, and the clamping distance between the pencil clamping wheel assemblies 30 is reduced, which is suitable for cutting thinner pencils. The pencil sharpener can cut pencils of different thicknesses and different cross-sectional shapes, and the thickness adjustment can be automatically performed during the insertion and removal of the pencil, without the need for additional adjustment of the thickness mechanism, which is convenient and fast.

[0085] In addition, the vertical plate of the base 20 is provided with a waist-shaped hole v to accommodate and guide the wheel shaft c1 to slide left and right, thereby adjusting the clamping distance; when the wheel shaft c1 slides, the inclined surface arranged on the floating frame 40 cooperates with the wheel shaft c1 to push the floating frame 40 to lift up, and the elastic member arranged between the shell panel 10 and the floating frame 40 can automatically reset the floating frame. Through the cooperation of the simple structure, the adjustment of the clamping thickness and the automatic resetting of the floating frame are realized at the same time, which is simple, ingenious and avoids occupying the internal space of the pencil sharpener.

[0086] As shown in Figure 2 , Figure 11 and Figure 12 , the pencil insertion mechanism 100 suitable for pencils of different outer diameters further comprises a transmission rod 50 and a dial plate 60.

[0087] The transmission rod 50 comprises a worm 51 and a first gear 52 arranged coaxially. The dial plate 60 comprises a connecting sleeve 61 and a second gear 62.

[0088] When installed, the connecting sleeve 61 is connected with the tool holder 70 of the cutting mechanism 204, the transmission gear 32 is engaged with the worm 51, and the first gear 52 and the second gear 62 are engaged. Preferably, the transmission rod 50 is located above the dial 60, and correspondingly, the transmission gear 32 is engaged with the worm 51 transversely, and the first gear 52 and the second gear 62 are engaged vertically.

[0089] And the two transmission gears 32 are distributed on both sides of the worm 51, so that the worm 51 can drive the two wheel assemblies 31 to rotate at the same time to clamp the pencil and drive the pencil inward.

[0090] The vertically engaged first and second gears can transmit the rotation of the transversely distributed cutting mechanism 204 to the transmission rod 50 located above the second gear 62. The transversely engaged transmission gear 32 and the worm 51 are engaged so that the transmission rod 50 drives the transmission gears 32 on both sides of it to rotate to clamp and drive the pencil inward.

[0091] Preferably, the pencil clamping wheel c2 is a rubber wheel to increase the friction between it and the pencil, so as to more stably clamp the pencil and drive the pencil to move inward.

[0092] The spring f in the embodiment can be a single spring with a larger diameter, and the single spring is distributed between the shell panel 10 and the pressing plate 41.

[0093] Of course, the spring f can also be provided as two or four. The springs f are evenly distributed between the shell panel 10 and the pressing plate 41.

[0094] In the initial state of the spring f, the shell panel 10 and the pressing plate 41 maintain a certain distance. Based on the existence of the distance, the pressing plate 41 and the shell panel 10 preferably have a guide structure d.

[0095] The guide structure d includes a guide column d1 provided on the inner side of the shell panel 10 and a guide hole d2 provided on the pressing plate 41, and the guide column d1 penetrates into the guide hole d2, so that the floating frame 40 can move back and forth along the predetermined guide track relative to the shell panel 10, thereby avoiding displacement.

[0096] As shown in Figure 14 and Figure 15 The end of the wheel shaft c1 includes an inner end 02 contacting the inclined curved surface s and an outer end 01 extending into the waist-shaped hole v. The diameter of the inner end 02 is greater than that of the outer end 01, so that the inner end 02 can better interact with the inclined curved surface s, and the unexpected force between the outer end 01 and the waist-shaped hole v does not affect the expected action of the inclined surface and the wheel shaft c1.

[0097] In simple terms, the cooperation between the waist-shaped hole v and the axle itself provides a lateral sliding range and guidance, aiming to make the axle c1 freely slide left and right in the waist-shaped hole v. The pressing force between the inclined surface and the axle c1 is transmitted more stably by increasing the contact surface between the axle c1 and the inclined surface, such as expanding the diameter of the axle. That is, in the technical solution, the outer end portion 01 has a smaller diameter, and the inner end portion 02 has a larger diameter.

[0098] In addition, as shown in Figure 14 and Figure 15 , the inner end portion 02 with a larger diameter is matched with the inclined surface, and the outer end portion 01 with a smaller diameter is matched with the waist-shaped hole c. More importantly, when the inner end portion 02 of the axle c1 is tangent to the inclined surface and is pressed against each other, the floating frame 40 is lifted or the floating frame 40 is reset downward under the action of the spring f and presses the axle c1, the outer end portion 01 of the axle c1 and the waist-shaped hole v do not have a force acting relationship, which can make the outer end portion 01 of the axle c1 move effectively in the waist-shaped hole v, and avoid the outer end portion 01 pressing the waist-shaped hole v in the upward and downward movement direction of the floating frame 40, thereby preventing the base 20 from unnecessary displacement.

[0099] Based on the description of the cooperation between the inclined surface and the axle c1 above, we can also know that the most important thing is to form a tangent and mutual pushing effect. Therefore, the specific shape of the inclined surface does not affect the realization of the technical purpose.

[0100] Of course, in order to make the axle c1 better contact and interact with the inclined surface, the inclined surface is preferably set as an inclined curved surface or an inclined arc surface, aiming to adapt the arc surface between the outer wall surface of the axle c1 and the inclined surface, so that the contact between them is more sufficient, and finally achieve the technical purpose of more stable and effective force transmission.

[0101] More preferably, the inclined curved surface s is a continuous and smooth curved surface. As shown in Figure 14 and Figure 15 , and the bracketed arc surface s1 described below. Of course, the inclined curved surface s can also be set as: the wall surface at the first and second positions is an arc surface matching the arc wall of the axle, and the wall surface at other positions is still an inclined straight wall surface.

[0102] The axle seat 42 is preferably a pressure axle plate t structure. Specifically, the four corners of the bottom surface of the pressure plate 41 extend downward to form four pressure axle plates t, and the inner side of the pressure axle plate t is recessed inward to form a pair of bracketed arc surfaces s1 between the two pressure axle plates t on the same side. The bracketed arc surfaces s1 on the same side are symmetrical to each other and have consistent arc surface tracks; the inclined curved surface s is the bracketed arc surface s1.

[0103] As shown in Figure 14 and Figure 15As shown, the symmetric and trajectory consistent inner bracket surface s1 can make the two wheel shafts c1 move up or down relative to the inner bracket surface s1 synchronously, and the two wheel shafts c1 are always at the same height. Even if the pen feeding mechanism is based on dynamic floating, the wheel shaft c1 always dynamically at the same height can always ensure the clamping stability of the pen clamping wheel assembly 30.

[0104] In the first state, as shown in the figure, Figure 14 As shown, the wheel shaft c1 is tangent to the first arc segment surface s11 of the inner bracket surface s1, and at this time the wheel shaft c1 is located at the first position r1 of the inner bracket surface s1. The distance between the two wheel shafts c1 is L1.

[0105] In the second state, as shown in the figure, Figure 15 As shown, the wheel shaft c1 is tangent to the second arc segment surface s12 of the inner bracket surface s1. At this time, the wheel shaft c1 is located at the first position r2 of the inner bracket surface s1. The distance between the two wheel shafts c1 is L2.

[0106] Preferably, the first position r1 of the inner bracket surface s1 is higher than the second position r2.

[0107] During the movement of the wheel shaft c1 from the first position r1 to the second position r2, the floating frame 40 is floated upward, and the spring f is compressed.

[0108] Preferably, the inner side of the shell panel 10 and the outer side of the pressing plate 41 of the floating frame 40 are provided with accommodation grooves 44 corresponding in number to the springs f, and the springs f are vertically accommodated in the accommodation grooves 44.

[0109] After the floating frame 40 is assembled with the base 20, the two pressing shaft plates t on the first side are located inside the first vertical plate 21, and the two pressing shaft plates t on the second side are located inside the second vertical plate 22.

[0110] And the accommodation area h for accommodating the pen clamping wheel assembly 30 is formed between the assembled floating frame 40 and the base 20.

[0111] Preferably, the pressing plate 41 of the floating frame 40 is provided with guide holes d2 on both sides, the guide holes d2 are in the same plane as the pressing plate 41, and the guide holes d2 protrude outward relative to the outer edge of the pressing plate 41.

[0112] More preferably, the base 20 is provided with a positioning structure for mounting the transmission rod 50. For the positioning structure, it needs to be explained that:

[0113] The outer edge of the first vertical plate 21 extends downward to form a positioning plate 27, the positioning plate 27 is provided with a first positioning hole n1, and the base plate 25 is provided with a second positioning hole n2.

[0114] Preferably, the first and second positioning holes are on the same straight line, and the two ends of the transmission rod 50 are distributed and pass through the first and second positioning holes; thereby realizing the installation of the transmission rod 50 on the base 20.

[0115] In actual operation, such as Figure 5 to Figure 7 The image shows the first state of the pencil feeding mechanism 100. At this time, the spring f is in its initial state, the distance between the two axles c1 is small, and the clamping opening between the pencil clamping wheels c2 is small, which is suitable for cutting finer pencils.

[0116] When you need to cut a thicker pencil, such as Figure 8 to Figure 10 The diagram shows the second state of the pencil feeding mechanism 100. A thicker pencil is inserted into the clamping opening, pushing the axles c1 on both sides to move laterally along the oblong holes v: one end of axle c1 moves along the first oblong hole v1, and the other end moves along the second oblong hole v2. Correspondingly, axle c1 and the inner curved surface s1 are pressed against each other until axle c1 pushes the floating frame 40 outward a certain distance, the clamping opening expands, and the spring f is compressed. After the thicker pencil has finished cutting, the floating frame 40 will automatically return to its original position under the action of the spring f.

[0117] The pencil sharpener in this embodiment is based on a floating adjustment mechanism, making it suitable for cutting pencils of different thicknesses and cross-sectional shapes.

[0118] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," and "outer," etc., indicate the orientation or positional relationship as is the orientation or positional relationship when the product of this invention is used, based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship based on the accompanying drawings, are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0119] The foregoing has provided a detailed description of the pencil feeding mechanism and pencil sharpener applicable to pencils of different outer diameters provided by the present invention. Specific examples have been used to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are merely for the purpose of helping to understand the present invention and its core ideas. It should be noted that those skilled in the art can make various improvements and modifications to the present invention without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A lead pencil feed mechanism suitable for different outer diameters of lead pencils, characterized in that: The shell panel with a pen insertion hole, a base, a pen clamping wheel assembly and a floating frame are included. The base includes a first vertical plate and a second vertical plate, and the first vertical plate and the second vertical plate are respectively provided with a waist-shaped hole extending transversely. The pen clamping wheel assembly includes two groups of wheel assemblies, each of which includes a wheel shaft, a pen clamping wheel and a transmission gear arranged on the wheel shaft in sequence, and the transmission gear is used to transmit the power of a pencil sharpening mechanism. The end of the wheel shaft is placed in the waist-shaped hole and can move transversely in the waist-shaped hole. The floating frame includes a pressing plate and four pressing shaft seats arranged on the lower side of the pressing plate, the bottom surface of the pressing shaft seat is provided with an inclined surface, the pressing plate is provided with a pen insertion hole corresponding to the pen insertion hole, and at least one elastic member is arranged between the shell panel and the pressing plate. In the first state, the floating frame is pressed against the wheel shaft by the elastic member, the two wheel shafts move to the inside of the waist-shaped hole, the wheel shaft is pressed against the first position of the inclined surface at this time, and the distance between the two wheel shafts is L1. In the second state, the wheel shaft moves to the outside of the waist-shaped hole, the distance between the two wheel shafts is L2, the wheel shaft is pressed against the second position of the inclined surface at this time, the floating frame moves upward to the compressed elastic member, and L2 is greater than L1.

2. The lead advance mechanism of claim 1, wherein: A transmission rod and a dial plate are further included. The transmission rod includes a worm and a first gear arranged coaxially. The dial plate includes a connecting sleeve connected with a tool holder and a second gear. The transmission gear is engaged with the worm, and the first gear and the second gear are engaged.

3. The lead advance mechanism of claim 1 adapted for use with different diameter pencils, wherein: The elastic member is two or four, the elastic member is a spring, and the pressing plate and the shell panel have a guide structure. The guide structure includes a guide column arranged on the inner side of the shell panel and a guide hole arranged on the pressing plate, the guide column penetrates into the guide hole, so that the floating frame can move relatively with respect to the shell panel.

4. The lead advance mechanism of claim 2, wherein: The base is provided with a positioning structure for mounting the transmission rod.

5. The lead advance mechanism of claim 1, wherein: The inclined surface is an inwardly recessed inner bracket surface, and the curvature of the inner bracket surface is continuous. The end of the wheel shaft includes an inner end portion in contact with the inclined surface and an outer end portion extending into the waist-shaped hole, and the diameter of the inner end portion is greater than that of the outer end portion.

6. The lead advance mechanism of claim 1 adapted for use with different diameter pencils, wherein: The first position of the inclined surface is higher than the second position. During the movement of the wheel shaft from the first position to the second position, the floating frame floats upward, and the elastic member is compressed.

7. The lead advance mechanism of claim 3, wherein: The outer side of the pressing plate of the floating frame is provided with a containing groove corresponding to the number of springs, and the spring is vertically contained in the containing groove.

8. The lead advance mechanism of claim 1 adapted for use with different diameter pencils, wherein: After the floating frame and the base are assembled, the two pressing shaft seats on the first side are located inside the first vertical plate, and the two pressing shaft seats on the second side are located inside the second vertical plate. The floating frame and the base form a containing area for containing the pen clamping wheel assembly after being assembled.

9. The lead advance mechanism of claim 1 adapted for use with different diameter pencils, wherein: The pressing plate of the floating frame is provided with guide holes on both sides, the guide holes are in the same plane as the pressing plate, and the guide holes protrude outward with respect to the outer edge of the pressing plate. The bottom surface of the pressing plate extends downward to form four pressing shaft plates, the inner side of the pressing shaft plate is recessed inward, so that a pair of inner bracket surfaces are formed between the two pressing shaft plates on the same side, the inner bracket surfaces on the same side are symmetrical and have consistent arc surface tracks. In the first state, the wheel shaft is tangent to the first arc segment of the inner arc surface, and in the second state, the wheel shaft is tangent to the second arc segment of the inner arc surface.

10. The lead advance mechanism of claim 2, wherein: The base comprises a substrate provided with a through hole, and first and second vertical plates extending outward from the two ends of the substrate; The first vertical plate is provided with first waist-shaped holes on both sides, the second vertical plate comprises two connecting rods, the outer ends of the connecting rods are provided with second waist-shaped holes, and the outer ends of the second waist-shaped holes are open; The outer edge of the first vertical plate extends downward to form a positioning plate, the positioning plate is provided with a first positioning hole, and the substrate is provided with a second positioning hole; The first and second positioning holes are on the same straight line, and the transmission rods are distributed and arranged at the first and second positioning holes; The second vertical plate comprises The transmission gear is transversely engaged with the worm, and the first and second gears are vertically engaged.

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