CN219789762U - Pencil advancing and retreating device and pencil sharpener for pencils with different diameters - Google Patents

Abstract

The utility model relates to a pen feeding and withdrawing device for pencils with different diameters, which is provided with a base (1), an upper cover (6) and a transmission mechanism arranged between the base (1) and the upper cover (6). The transmission mechanism comprises a toothed rotary table (2), a transmission shaft assembly, a pen inlet shaft assembly and a movable square frame (3) which are arranged in the inner cavity of the base (1). Wherein the first drive shaft assembly (4) and the second drive shaft assembly (4 ') are two bevel gears (42, 43;42',43 ') parallel to each other, the first pen-feeding shaft assembly (5) and the second pen-feeding shaft assembly (5 ') are respectively provided with two bevel gears (52, 53;52',53 ') so as to realize bevel gear transmission with the bevel gears (42, 43;42',43 ') of the first drive shaft assembly (4) and the second drive shaft assembly (4 ') and always keep meshed during pen-feeding by means of a movable frame, thereby improving universality and product force. The utility model also relates to a pencil sharpener with the pencil advancing and retreating device.

Description

Pencil advancing and retreating device and pencil sharpener for pencils with different diameters

Technical Field

The present utility model relates to a pencil advancing and retreating device, and more particularly, to a pencil advancing and retreating device for pencils of different diameters to feed pencils of different diameters to a winding position of a pencil sharpener. The utility model further relates to a pencil sharpener with the pencil advancing and retreating device.

Background

The pencil advancing and retreating device is generally an integral part of a semi-automatic or automatic pencil sharpener for feeding the pencil's pencil point to be sharpened into a sharpener position. Since the types of conventional drawing pencils are generally in the range of 2H-2B, there is a certain difference in the diameters of the conventional drawing pencils corresponding to the types of the conventional drawing pencils, so that in the conventional pencil sharpener with a single-inlet diameter, a pencil with an undersized outer diameter slips when entering the inlet of the pencil sharpener, and a pencil with an oversized outer diameter cannot enter the inlet of the pencil sharpener, which both cases cause difficulty in sharpening pencils with large diameter size differences.

In order to solve the above technical problems, the prior art CN 201922805U provides an automatic pencil feeding device for pencil sharpening, the driving mechanism of the pencil feeding device comprises a pair of pencil clamping shafts, and a rotary disc and a driving disc which are connected together, wherein the pencil clamping shafts are respectively provided with friction wheels sleeved on the movable wheels, and the rotary disc is provided with friction surfaces. In the process that the transmission disc drives the rotary disc to rotate positively and reversely, the power for enabling the pencil to enter the rolling part of the pencil sharpener is transmitted by means of the friction force between the friction surface of the rotary disc and the friction wheel of the pencil clamping shaft, and the rotary disc moves upwards in the direction towards the pencil clamping shaft through a reed or spring sliding structure additionally arranged at the bottom of the transmission disc, so that the contact pressure between the friction wheel of the pencil clamping shaft and the friction surface of the rotary disc is increased. In addition, in order to automatically withdraw the pencil from the sharpening part after the sharpening process is finished, not only is the reed or the spring sliding structure arranged at the bottom of the transmission disc required to move downwards towards the direction away from the pencil clamping shaft to reduce the friction force of the turntable against the friction wheel, but also the key connection between the movable wheel and the shaft lever of the pencil clamping shaft is required to be further separated, so that the compression state of the pencil can be relieved. In this embodiment, a clutch structure of the friction wheel and the movable wheel on the pen holder and corresponding clutch operation, a mating structure between the transmission disc and the friction disc, a compression spring structure between the transmission disc and the base and corresponding compression spring operation, and a swivel operation between the friction disc and the pen holder friction wheel are designed.

Specifically, in order to realize the pen feeding operation, axial engagement between the friction wheel and the movable wheel needs to be realized by means of a clutch mechanism in sequence, then the clamp spring of the transmission disc is moved upwards to realize extrusion among the movable wheel, the friction wheel and the friction wheel on the pen clamping shaft, and then rotary movement between the friction disc and the friction wheel on the pen clamping shaft is realized. In order to realize the pen withdrawal operation, the compression spring of the transmission disc needs to be firstly moved downwards to reduce the extrusion between the movable wheel, the friction wheel and the friction wheel on the pen clamping shaft, and the axial joint between the friction wheel and the movable wheel can be further released through the clutch mechanism. The pencil feeding device of the pencil sharpener relates to a plurality of different transmission and movement mechanisms, the movements between the transmission mechanisms and the movement mechanisms are separated from each other, a user can complete the whole set of actions by following operation steps according to the requirements of pencil feeding and pencil withdrawing, the operation process is complex, the pressure spring structure between the bottom of the transmission disc and the base body is fragile, once the risk of breakage and abrasion occurs in the long-term use process, the effective extrusion between the friction disc and the friction wheel on the pencil clamping shaft cannot be ensured, and the pencil feeding and withdrawing movement of the whole mechanism is negatively influenced. Further, since the structure of each component related to the pen feeding mechanism is complex, during the operation, for example, the frequent operation of the clutch mechanism may cause damage to the component, and abrasion of the friction surface after long-term use may cause slipping during the process of advancing and retreating the pen, thereby further affecting the normal operation of the pen advancing and retreating device and the pen cutter with the pen advancing and retreating device. Furthermore, the pen feeding device does not relate to the technical scheme of feeding and withdrawing pencils with different diameters.

The prior art CN 204222500U further considers the need to accommodate the advance and withdrawal of pencils of different outside diameter sizes. Besides the rotary table with friction disc surface and the rotary shaft pair with pen clamping rotary wheel, the rotary shaft bearing position I and rotary shaft bearing position II with conical cylindrical surface structures are designed at two ends of each rotary shaft, wherein the taper trend of the cylindrical conical surfaces of the rotary shaft bearing position I and the rotary shaft bearing position II is the same. Through the cylindrical conical surfaces of the first rotating shaft bearing position and the second rotating shaft bearing position with the same taper trend, when the two rotating shafts axially move in opposite directions, the axial distance between the two rotating shafts changes, so that the friction force between the friction driving wheel of the flexible glue and the rotating disc with the friction disc surface can be matched when the pencil is fed forward and automatically withdrawn in a reverse way, and the requirements of pencil feeding and withdrawing of pencils with different diameters can be met. The technical scheme of separating the traditional friction disk and the transmission disk is combined into the rotary disk with the friction disk surface, so that the structure of the driving pen feeding and withdrawing mechanism is simplified.

In particular, in order to achieve the pen-in and pen-out operations, in this embodiment, a plurality of elastic pieces for increasing the friction force between the turntable having a friction surface and the friction driving wheel of the rotating shaft, in particular, a plurality of plastic elastic pieces integrally formed with the pinch roller seat are also provided on the surface of the pinch roller seat according to the conventional design. The elastic sheet with the plastic structure also has the risks of frequent breakage and abrasion due to brittleness in the long-term use process, and further, the friction surface between the rotary table and the soft rubber friction driving wheel of the rotary shaft is abraded after repeated use, so that the friction driving wheel of the rotary table and the rotary shaft can also slip in the pen feeding and retreating process, and the use effect of the whole pen feeding and retreating device and the normal operation of the pencil sharpener with the pen feeding and retreating device are affected.

Disclosure of Invention

The present utility model is therefore directed to a pencil advancing and retreating device for pencils of different diameters, which is configured to solve at least some of the above problems, preferably to overcome the disadvantages of the prior art, such as a relatively complex operation process, a relatively fragile part structure, and easy wear and breakage, which may result in slipping during the pencil advancing and retreating process, and poor use effect of the pencil advancing and retreating device, and to provide a more stable and reliable pencil advancing and retreating device suitable for pencils of different diameters, so as to rapidly and conveniently perform the pencil advancing and retreating operation.

According to one aspect of the present utility model, there is provided a pen feeding and retracting device for pencils of different diameters, the pen feeding and retracting device having a base, an upper cover, and a driving machine disposed between the base and the upper cover. Further, the base and the upper cover are both provided with a central through hole for the penholder to pass through. Specifically, the transmission mechanism comprises a toothed turntable, a transmission shaft assembly, a pen inlet shaft assembly and a movable square frame which are arranged in the inner cavity of the base. More specifically, the transmission shaft assembly placed in the base comprises a first transmission shaft assembly and a second transmission shaft assembly capable of meshed transmission with the toothed turntable, wherein the first transmission shaft assembly and the second transmission shaft assembly are parallel to each other and respectively provided with two helical gears with opposite helical angle directions; the pen shaft assembly capable of being supported by the movable box comprises a first pen shaft assembly and a second pen shaft assembly which are arranged in parallel, wherein each of the first pen shaft assembly and the second pen shaft assembly is provided with two bevel gears for meshed transmission with the bevel gears of the first transmission shaft assembly and the second transmission shaft assembly respectively; the upper cover comprises an upper cover panel and a pair of opposed pen-feeding bearing-carrying parts which can be inserted into the peripheral wall of the movable frame; a movable square frame operatively engaged with the base has at least one pair of opposed peripheral walls, wherein the peripheral walls have inverted trapezoidal cutouts for receiving the pencil shaft assemblies to permit the first pencil shaft assembly and the second pencil shaft assembly to slide along the inverted trapezoidal cutouts to define a space therebetween for insertion of pencils of different diameters, wherein the inverted trapezoidal cutouts are designed to permit the movable square frame to move vertically relative to the base to mate with the pencil shaft bearing portion of the upper cover to permit constant engagement therein between the first pencil shaft assembly and the first drive shaft assembly and between the second pencil shaft assembly and the second drive shaft assembly during pencil retraction.

Based on the above, the pencil feeding and withdrawing device provided by the utility model provides a space which is suitable for inserting and traversing pencils with different diameters, and by means of the movable fit between the movable square frame and the pencil feeding bearing carrying part, the pencil feeding and withdrawing device can be freely and steplessly adjusted to adapt to pencils with different sizes without affecting stable work during pencil feeding and withdrawing. Because the pen shaft assembly is spaced apart from the drive shaft assembly, this allows the engagement location between the drive shaft assembly and the toothed turntable to be substantially constant regardless of the lateral distance between the pen shaft assemblies, thereby ensuring reliable engagement therebetween and improving stability during transmission progress. Compared with the prior art that a plurality of gears with different fixed sizes are required to be arranged for meeting the general purpose shape of the pencil sharpener, the pencil sharpener has the advantages of improving the product force and the operability of a user. Meanwhile, the assembling of the pen shaft assembly can be simplified and the assembling precision can be improved by means of the inverted trapezoid notch design. Further, due to the stable transmission of the toothed turntable and the transmission shaft gear transmission and the high transmission ratio formed by the stable transmission, the toothed turntable of the pen shaft assembly obtains higher rotation speed under the operation of an external handle, so that a user can more conveniently and rapidly complete the whole pen feeding and retreating operation process.

Specifically, the base includes: an opposed pair of short cavity walls each having at least one drive shaft support seat, wherein the drive shaft support seats are configured with semi-circular depressions adapted to the shaft end shapes of the first and second drive shaft assemblies and allow the first and second drive shaft assemblies to swivel within the drive shaft support seats having the semi-circular depressions; the plurality of corner edges each have a lower column, wherein a cambered surface-shaped spring retaining wall extending along the longitudinal height direction of the base and protruding towards the center of the base is respectively constructed at the base corner edges; a pair of opposed long chamber walls each having at least one base stop portion; and a counter bore in the middle of the base for mounting the toothed turntable, the counter bore also defining a revolution space for the toothed turntable.

The base forms a receiving space for the toothed turntable and the drive shaft assembly and provides the possibility of a first stage of meshing drive of the toothed turntable with the drive shaft assembly, so that the rotary motion of the toothed turntable in the longitudinal direction about its central longitudinal axis is transmitted by the first drive shaft assembly and the second drive shaft assembly to the rotary motion of the toothed turntable in the longitudinal direction about its respective axis by the first drive shaft assembly and the second drive shaft assembly meshing therewith. Preferably, the counter bore is centrally and symmetrically arranged in the middle of the base; more preferably, the transmission shaft supporting seat with the semicircular recess is symmetrically arranged in the longitudinal direction relative to the center of the counter bore, thereby providing the possibility of symmetrically arranging the toothed turntable, the first transmission shaft assembly and the second transmission shaft assembly in the longitudinal direction, ensuring the balance of stress of the first transmission shaft assembly and the second transmission shaft assembly and providing an effective supporting basis for realizing stable first-stage meshing transmission.

More specifically, the first and second drive shaft assemblies are symmetrically arranged along the longitudinal direction of the base; the first transmission shaft assembly is provided with a first transmission shaft gear, a first bevel gear and a second bevel gear, wherein the first transmission shaft gear and the first bevel gear are positioned near a first end, the second bevel gear is positioned near a second end, and the end face of the first transmission shaft gear in the direction towards the first end is abutted against the first bevel gear; the second transmission shaft assembly is provided with a second transmission shaft gear, a third bevel gear and a fourth bevel gear, wherein the second transmission shaft gear and the third bevel gear are positioned near a third end, the fourth bevel gear is positioned near a fourth end, and the second transmission shaft gear is abutted against the first bevel gear at the end face facing the direction of the third end.

With this arrangement, the turning motion of the toothed turntable in the longitudinal direction about its central longitudinal axis is transmitted simultaneously to the first and second bevel gears of the first drive shaft assembly and the third and fourth bevel gears of the second drive shaft assembly via the first drive shaft gear of the first drive shaft assembly and the second drive shaft gear of the second drive shaft assembly. According to the foregoing, the helical angles of the two helical gears of each driveshaft assembly are in opposite directions. In this regard, one non-limiting embodiment is that the first helical gear of the first drive shaft assembly is a right-hand involute helical gear and its second helical gear is a left-hand involute helical gear, thereby providing an axial force directed toward the shaft end to the helical gear to be engaged in the next stage, respectively.

Further, the first pen shaft assembly is provided with a first outer bevel gear and a second outer bevel gear which are symmetrically arranged near the shaft end, and a first pen shaft elastic roller which is arranged in the middle and takes the shape of a waist, wherein the end face of the first pen shaft elastic roller is respectively abutted against the end faces of the first outer bevel gear and the second outer bevel gear towards the axial center point of the first pen shaft assembly; the second pen inlet shaft assembly is provided with a third outer bevel gear and a fourth outer bevel gear which are symmetrically arranged near the shaft end, and a second pen inlet shaft elastic roller which is arranged in the middle and takes the shape of a waist, wherein the end face of the second pen inlet shaft elastic roller is respectively abutted against the end faces of the third outer bevel gear and the fourth outer bevel gear, which face the axial center point of the second pen inlet shaft assembly.

In view of this, the first and second drive shaft assemblies arranged in pairs ensure stable transmission of the movement power of the pencil in the pencil advancing and retreating device. And since the first transmission shaft assembly and the second transmission shaft assembly are parallel to each other and respectively have the two bevel gears with opposite helix angle directions. According to the non-limiting embodiment, when the first bevel gear of the first shaft assembly is a right-hand involute bevel gear and the second bevel gear is a left-hand involute bevel gear, the two bevel gears of the first shaft assembly and the second shaft assembly are respectively meshed with the bevel gears of the first shaft assembly and the second shaft assembly, so that axial force which is directed towards the shaft center and deviates from the shaft ends is formed on the two bevel gears of the first shaft assembly and the second shaft assembly, and further elastic rollers arranged in the middle of the first shaft assembly and the second shaft assembly are axially compressed, so that when a pencil holder enters a holder accommodating space formed by the two elastic rollers, the pencil holder is tightly pressed by the two elastic rollers, and the bevel gears of the first shaft assembly and the second shaft assembly are stably driven under the action of the reaction force of the pencil holder.

Further, the movable frame has corner edge portions having a cambered surface shape, and optionally, the corner edge portions of the movable frame have spring supporting surfaces and upper columns for receiving the respective springs, respectively, on a side thereof facing the upper cover, wherein a peripheral wall of the movable frame can surround a peripheral wall of the base in a form-fitting manner.

Further, the pen-feeding bearing-carrying part of the upper cover extends from the upper cover panel in the depth direction, wherein the pen-feeding bearing-carrying part is in a right trapezoid shape and is provided with arc-shaped carrying surfaces which are symmetrically arranged so as to limit the rotation space of the first pen-feeding shaft assembly and the second pen-feeding shaft assembly together with the inverted trapezoid notch of the movable square frame; the upper cover panel is provided with at least one pair of limit openings at a pair of upper cover edges transverse to the pen-feeding bearing loading portion. Preferably, the outer wall of the arc bearing surface of the pen bearing part is in clearance fit with the inner peripheral wall of the movable square frame, and more preferably, the limit openings can be two pairs of opposite limit openings. Whereby the axial ends of said first and second pen shaft assemblies roll on surfaces constrained in common by both the arcuate bearing surfaces of the pen shaft bearing portions and the inverted trapezoidal cutouts of the movable box and further define the extreme positions of said first and second pen shaft assemblies.

Particularly optionally, the upper cover further has an upper cover fillet conforming to a portion of the outer periphery Zhou Bixiang of the spring to abut the spring around the lower cylinder at the base corner. Therefore, when the pencil holder of the pencil is inserted, the movable box can be applied with pressure along the depth direction through the movement of the arc bearing surface of the pencil inlet bearing part and the inverted trapezoid notch of the movable box by the shaft ends of the first pencil inlet shaft component and the second pencil inlet shaft component, and the spring positioned at the corner edge part is compressed to store potential energy. Thus, when the pencil shaft of the pencil is withdrawn, the spring positioned at the corner edge part is released to return the movable frame to the initial position.

In particular, the base stop extends in a longitudinal height direction from the long cavity wall of the base to combine with the stop opening shape of the upper cover panel to define a longitudinal height of the movable frame that is vertically movable relative to the base. Preferably, the base limiting part is two pairs of opposite limiting openings combined with the limiting opening shape of the upper cover panel. More preferably, the base stop is configured as a catch or stop or other form of stop element.

According to an aspect of the present utility model, there is also provided a pencil sharpener with a pencil advancing and retreating device for pencils of different diameters having the above features.

In summary, the utility model provides a more stable and reliable pen feeding and withdrawing device which is operated by utilizing the toothed turntable transmission and the helical gear transmission, and the pen feeding and withdrawing device can rotate the toothed turntable through an external handle after a pen holder of a pencil is inserted into a pen holder accommodating space formed by two elastic rollers, so that pencils with different diameters can be operated in a rapid and convenient mode. Furthermore, the utility model also avoids the defects of slipping in the pen feeding and retreating process and poor use effect of the pen feeding and retreating device caused by the fact that the existing pen feeding and retreating device is complex in operation, fragile in part structure and easy to wear and break, and further improves the use effects of the pen feeding and retreating device and a pencil sharpener with the pen feeding and retreating device.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the utility model and are exemplary and explanatory only and not restrictive of the utility model.

FIG. 1 is a three-dimensional perspective view of a pencil advancing and retreating device in an assembled state, further showing a pencil passing through the pencil advancing and retreating device, according to the present utility model;

FIG. 2 is a three-dimensional exploded view of one particular embodiment of the pen advance and retreat device shown in FIG. 1, showing the assembled relationship and specific structure between the components;

FIG. 3 is a three-dimensional perspective view of the advancing and retracting device shown in FIG. 1 with the upper cover removed, showing the relative position between a pencil passing through the advancing and retracting device and the advancing shaft assembly;

FIG. 4 is a three-dimensional perspective view of the pen advance and retreat device shown in FIG. 1 with the upper cover and movable box removed, showing in particular the relative position between the pen shaft assembly and the base;

FIG. 5 is a three-dimensional perspective view of the pen shaft assembly, the drive shaft assembly and the toothed turntable in an assembled state according to the pen advance and retreat device shown in FIG. 1, particularly illustrating the assembled relationship between the pen shaft assembly, the drive shaft assembly and the toothed turntable;

FIG. 6 is a three-dimensional perspective view of the pen advance and retreat device according to FIG. 1, viewed from below and upward, showing in particular one particular manner of assembly of the spring member;

fig. 7 is a three-dimensional perspective view of the pen advance and retreat device shown in fig. 6, with the spring removed, showing in particular the placement of the driveshaft assembly in the upper cover.

Reference numerals:

pencil 200 base 1 of pencil advancing and retreating device 100

Transmission shaft supporting seat 13 of base limiting part 12 of lower column 11

Spring retaining wall 14 toothed turntable mounting counter bore 15 toothed turntable 2

Movable frame 3 spring bearing surface 31 inverted trapezoidal cut 32 upper column 33

First drive shaft Assembly 4 first drive shaft Gear 41 first helical gear 42

The first end 44 and the second end 45 of the second helical gear 43

Second drive shaft assembly 4' second drive shaft gear 41' third bevel gear 42'

Fourth helical gear 43', third end 44', fourth end 45'

First pen shaft Assembly 5 first pen shaft elastic roller 51

First outer bevel gear 52 second outer bevel gear 53 second pen shaft assembly 5'

The second pen-feeding shaft elastic roller 51 'and the third outer bevel gear 52'

Fourth outside bevel gear 53'

The upper cap 6 has a cap central through hole 61 into the pen-bearing-carrying portion 62

Upper cover panel 64 of upper cover fillet 63 of arcuate bearing surface 621

Upper cover edge 65 limit opening 651

Spring 7

Detailed Description

The present utility model will be described with reference to the accompanying drawings, and it is to be understood that the examples set forth below are only illustrative of the technical aspects of the present utility model and are not limiting thereof. The drawings are provided to present various embodiments of the utility model, but are not necessarily drawn to scale and certain features may be exaggerated, removed, or partially sectioned to better illustrate and explain the present disclosure. The position of part of components in the drawings can be adjusted according to actual requirements on the premise of not affecting the technical effect. The appearances of the phrase "in the drawings" or similar language in the specification do not necessarily all refer to the figures or examples.

Certain directional terms used hereinafter to describe the drawings, such as "inner", "outer", "upper", "lower", "top", "bottom" and other directional terms, will be understood to have their normal meaning and refer to those directions as they would be when viewing the drawings. Unless otherwise indicated, directional terms described in this specification are essentially in accordance with conventional directions as understood by those skilled in the art.

The terms "first," "second," and the like as used herein do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. Where the expression "generally" allows for a reasonable range of angular deviations without being absolutely identical.

Some embodiments of the present utility model are described in detail below with reference to the accompanying drawings. The following embodiments and features of the embodiments may be combined with each other without conflict.

Fig. 1 is a three-dimensional perspective view of a pen-advancing and retracting device according to the present utility model in an assembled state, in which a pencil passing through the pen-advancing and retracting device is also shown. Fig. 2 is a three-dimensional exploded view of one particular embodiment of the pen advance and retreat device shown in fig. 1, showing the assembled relationship and specific structure between the components. According to fig. 2, the pencil feeding and withdrawing device for pencils with different diameters comprises a base 1, an upper cover 6 and a transmission mechanism arranged between the base 1 and the upper cover 6, wherein the base 1 and the upper cover 6 are respectively provided with a central through hole for a penholder to pass through. Specifically, the transmission mechanism comprises a toothed turntable 2, a transmission shaft assembly, a pen shaft assembly and a movable box 3 which are arranged in the inner cavity of the base 1. More specifically, the drive shaft assembly placed in the base 1 comprises a first drive shaft assembly 4 and a second drive shaft assembly 4 'capable of meshing with the toothed turntable 2, wherein the first drive shaft assembly 4 and the second drive shaft assembly 4' are parallel to each other and respectively have two helical gears 42,43 or 42',43' with opposite helical angles; the pen shaft assembly supported by the movable frame 3 comprises a first pen shaft assembly 5 and a second pen shaft assembly 5' which are arranged in parallel, wherein the first pen shaft assembly 5 and the second pen shaft assembly 5' are respectively provided with two bevel gears 52, 53 or 52',53' for respectively connecting with the bevel gears 42,43 of the first transmission shaft assembly 4 and the second transmission shaft assembly 4 '; 42',43' are engaged; the movable frame 3 operatively engaged with the base 1 has at least one pair of opposed peripheral walls with inverted trapezoidal cutouts 32 capable of resting in the shaft assemblies to allow the first shaft assembly 5 and the second shaft assembly 5' to slide along the inverted trapezoidal cutouts 32 to form a space therebetween for insertion of pencils of different diameters, wherein the inverted trapezoidal cutouts 32 are designed to allow vertical movement of the movable frame 3 relative to the base 1 to allow constant engagement between the first shaft assembly 5 and the first drive shaft assembly 4 and between the second shaft assembly 5' and the second drive shaft assembly 4' therein; the upper cover 6 comprises an upper cover panel 64 and a pair of opposed pen-feed bearing carrier portions 62 which can be inserted into the peripheral wall of the movable frame 3.

Thus, the pencil advancing and retreating device provides a space which is suitable for inserting and traversing pencils with different diameters, and further presents a more stable and reliable pencil advancing and retreating implementation which is different from the prior art through a toothed rotary disc transmission mode and a bevel gear transmission mode. Due to the stable transmission of the toothed turntable and the transmission shaft gear transmission and the high transmission ratio formed by the stable transmission, the toothed turntable of the pen-feeding shaft assembly obtains higher rotation speed under the operation of an external handle, so that a user can more conveniently and rapidly complete the whole pen-feeding and retreating operation process. It is particularly pointed out that by means of the movable fit between the movable block and the loading portion of the pen-feeding bearing, it is possible to adjust freely and steplessly to pencils of different sizes without affecting the stable operation during pen-feeding and withdrawal. In particular, because the pen shaft assembly is provided separately from the drive shaft assembly, this allows the position of engagement between the drive shaft assembly and the toothed turntable to be substantially constant regardless of the lateral distance between the pen shaft assemblies, thereby ensuring reliable engagement therebetween and improving stability during drive progress. Compared with the prior art that a plurality of gears with different fixed sizes are required to be arranged for meeting the general purpose shape of the pencil sharpener, the pencil sharpener has the advantages of improving the product force and the operability of a user.

More specifically, the base 1 includes: an opposed pair of short cavity walls each having at least one drive shaft support seat 13, wherein the drive shaft support seats 13 are configured with semi-circular depressions adapted to the shaft end shape of the first drive shaft assembly 4 and the second drive shaft assembly 4 'and allow the first drive shaft assembly 4 and the second drive shaft assembly 4' to swivel within the drive shaft support seats 13 having the semi-circular depressions; a plurality of corner sections each having a lower column 11, wherein a cambered spring blocking wall 14 extending in the longitudinal direction +z of the base 1 and protruding toward the center of the base 1 is respectively formed at the corner sections of the base 1; a pair of opposed long chamber walls each having at least one base stopper 12; and a counter bore 15 for mounting the toothed turntable, which is located in the middle of the base 1, and which also further defines the revolution space of the toothed turntable.

It follows that the base 1 constitutes a housing space for the toothed turntable 2 and the drive shaft assembly and offers the possibility of a first stage of meshing drive of the toothed turntable with the drive shaft assembly, so that a swiveling movement of the toothed turntable 2 in the longitudinal direction about its central longitudinal axis is transmitted by the first drive shaft assembly 4 and the second drive shaft assembly 4 'to a swiveling movement of the first drive shaft assembly 4 and the second drive shaft assembly 4' meshing therewith in the longitudinal direction about their respective axes. Preferably, the counter bore 15 is arranged in a central symmetrical manner in the middle of the base 1; more preferably, the drive shaft bearing blocks 13 having the semicircular recesses are symmetrically arranged in the longitudinal direction with respect to the center of the counterbore 15, thereby providing the possibility of arranging the toothed turntable 2 and the first and second drive shaft assemblies 4, 4 'symmetrically in the longitudinal direction, thereby ensuring the balance of the forces of the first and second drive shaft assemblies 4, 4', providing an effective support basis for achieving a smooth first stage meshing drive.

More specifically, the first driveshaft assembly 4 and the second driveshaft assembly 4' are symmetrically arranged along the longitudinal direction +x of the base 1; the first drive shaft assembly 4 has a first drive shaft gear 41 and a first helical gear 42 located near a first end 44 and a second helical gear 43 located near a second end 45, and the first drive shaft gear 41 abuts against the first helical gear 42 at an end face in a direction toward the first end 44; the second propeller shaft assembly 4' has a second propeller shaft gear 41' and a third bevel gear 42' located near a third end 44' and a fourth bevel gear 43' located near a fourth end 45', and the second propeller shaft gear 41' abuts against the first bevel gear 42' at an end face in a direction toward the third end 44 '.

By this arrangement, the turning motion of the toothed turntable 2 in the longitudinal direction about its central longitudinal axis is transmitted simultaneously to the first and second bevel gears 42 and 43 of the first drive shaft assembly and the third and fourth bevel gears 42 'and 43' of the second drive shaft assembly through the first drive shaft gear 41 of the first drive shaft assembly 4 and the second drive shaft gear 41 'of the second drive shaft assembly 4'. According to the foregoing, the helical angles of the two helical gears of each driveshaft assembly are in opposite directions. In this regard, in one non-limiting embodiment, the first bevel gear 42 of the first drive shaft assembly 4 may be a right-hand involute bevel gear and its second bevel gear 43 may be a left-hand involute bevel gear, thereby creating an axial force on both bevel gears directed toward the shaft end, respectively.

Further, the first pen shaft assembly 5 has a first outer bevel gear 52 and a second outer bevel gear 53 symmetrically arranged near the shaft end, and a first pen shaft elastic roller 51 in the shape of a waist arranged in the middle, wherein the end surfaces of the first pen shaft elastic roller 51 respectively abut against the end surfaces of the first outer bevel gear 52 and the second outer bevel gear 53 facing the axial center point of the first pen shaft assembly 5; the second pen shaft assembly 5 'has a third outer bevel gear 52' and a fourth outer bevel gear 53 'symmetrically arranged near the shaft end, and a second pen shaft elastic roller 51' which is arranged in the middle and takes the shape of a waist, and the end surfaces of the second pen shaft elastic roller 51 'respectively abut against the end surfaces of the third outer bevel gear 52' and the fourth outer bevel gear 53 'facing the axial center point of the second pen shaft assembly 5'.

In view of this, the first and second drive shaft assemblies 4 and 4' arranged in pairs ensure stable transmission of the movement power of the pencil in the pencil advancing and retreating device. And since the first and second drive shaft assemblies 4 and 4' are parallel to each other and have the aforementioned helical angles respectively in opposite directions. According to the foregoing non-limiting embodiment, when the first bevel gear 42 of the first shaft assembly 4 is a right-hand involute bevel gear and the second bevel gear 43 is a left-hand involute bevel gear, the two bevel gears of the first shaft assembly 5 and the second shaft assembly 5 'are respectively meshed with the bevel gears of the first shaft assembly 4 and the second shaft assembly 4', so that axial forces directed away from the shaft ends and toward the shaft center are formed on the two bevel gears of the first shaft assembly 5 and the second shaft assembly 5', and further elastic rollers arranged in the middle of the first shaft assembly 5 and the second shaft assembly 5' are compressed in the axial direction, so that when a pencil enters a holding space of the pencil shaft formed by the two elastic rollers, the pencil shaft is tightly pressed by the two elastic rollers, and the bevel gears of the first shaft assembly and the second shaft assembly are stably driven under the reaction force of the pencil shaft.

Another non-limiting embodiment is when the first bevel gear 42 of the first drive shaft assembly 4 is a left-hand involute bevel gear and the second bevel gear 43 is a right-hand involute bevel gear, whereby an axial force directed toward the center point of the shaft is created on both bevel gears, respectively. The two bevel gears of the first pen shaft assembly 5 and the second pen shaft assembly 5' are respectively meshed with the bevel gears of the first transmission shaft assembly 4 and the second transmission shaft assembly 4', so that axial forces which are directed towards shaft ends respectively from center points of back shafts are formed on the two bevel gears of the first pen shaft assembly 5 and the second pen shaft assembly 5 '. In this embodiment, it is conceivable that the end faces of the two bevel gears of the first and second shaft assemblies 5, 5 'respectively, near the shaft ends abut against the inner peripheral wall of the movable frame 3 having the inverted trapezoidal cutout 32, thereby further compressing the elastic rollers disposed in the middle of the first and second shaft assemblies 5, 5' in the axial direction as well.

Further, the movable frame 3 has corner edges having a cambered surface shape, and the corner edges of the movable frame 3 have spring support surfaces 31 and upper posts 33 for receiving the respective springs 7, respectively, on the sides thereof facing the upper cover 6, wherein the peripheral wall of the movable frame 3 can surround the peripheral wall of the base 1 in a form-fitting manner.

Further, the pen-feeding bearing portion 62 of the upper cover 6 extends from the upper cover panel 64 in the depth direction-Z, wherein the pen-feeding bearing portion 62 is in a right trapezoid shape and has arc-shaped bearing surfaces 621 symmetrically arranged to define a revolution space of the first pen-feeding shaft assembly 5 and the second pen-feeding shaft assembly 5' together with the inverted trapezoid slit 32 of the movable frame 3; the upper cover panel 64 is provided with at least one pair of limit openings 651 at a pair of upper cover edges 65 transverse to the pen-bearing carrier portion 62. Preferably, the outer wall of the arc-shaped bearing surface 621 of the pen-feeding bearing-carrying portion 62 is in clearance fit with the inner peripheral wall of the movable frame 3, and more preferably, the limit openings may be two pairs of opposed openings.

Whereby the axial ends of the first and said second pen shaft assemblies 5, 5 'roll on the surfaces jointly constrained by both the arcuate bearing surface 621 of the pen shaft bearing carrying portion 62 and the inverted trapezoidal cutout 32 of the movable block 3 and additionally define the extreme positions of the first and said second pen shaft assemblies 5, 5'.

In particular, the upper cover 6 also has an upper cover fillet 63 that conforms to a portion of the outer periphery Zhou Bixiang of the spring 7 to abut the spring 7 that is sleeved around the lower cylinder 11 at the corner of the base 1. Thus, when the pencil holder is inserted, the movable frame is pressed in the depth direction by the movement of the arc-shaped bearing surface 621 of the pencil-feeding bearing-carrying part 62 and the inverted trapezoid notch 32 of the movable frame 3 at the shaft ends of the first pencil-feeding shaft assembly 5 and the second pencil-feeding shaft assembly 5', and the spring positioned at the corner edge is compressed to store potential energy. Thus, when the pencil shaft of the pencil is withdrawn, the spring positioned at the corner edge part is released to return the movable frame to the initial position.

In particular, the base stop 12 extends in the longitudinal direction +z from the long cavity wall of the base 1 to combine with the stop opening 651 shape of the upper cover panel 64 to define the longitudinal height of the movable frame 3 which is vertically movable relative to the base 1. Preferably, the base stop 12 is two pairs of opposed stop openings that are shape-bonded to the stop openings 651 of the upper cover panel 64. More preferably, the base stop 12 is configured as a catch or stop.

According to an aspect of the present utility model, there is also provided a pencil sharpener with a pencil advancing and retreating device for pencils of different diameters having the above features.

In use, referring to fig. 1 to 7, the pencil 200 is first passed through the upper cover central through hole 61 of the upper cover 6, the accommodation space between the first pen-feeding shaft elastic roller 51 of the first pen-feeding shaft assembly 5 and the second pen-feeding shaft elastic roller 51' of the second pen-feeding shaft assembly 5', the accommodation space between the first transmission shaft assembly 4 and the second transmission shaft assembly 4', the central through hole of the toothed turntable 2, and the toothed turntable mounting counterbore 15 of the base 1. According to one aspect of the present embodiment, when small-diameter pencils are sequentially pushed in the above order, the first and second pencil-advancing shaft elastic rollers 51 and 51 'are pressed to slightly swivel the shaft ends of the first and second pencil-advancing shaft assemblies 5 and 5' in directions away from each other along the arc-shaped bearing surfaces 621 of the pencil-advancing bearing parts 62 and simultaneously slightly move toward the elevation direction +z along the inverted trapezoid slit 32 of the movable block 3, thereby pressing the movable block 3 toward the depth direction-Z and causing the springs 7 to store potential energy. According to another aspect of the present embodiment, when the pencils of small diameter are sequentially pushed in the above order, the shaft ends of the first and second pencil-advancing shaft assemblies 5 and 5' are largely rotated in directions away from each other along the arc-shaped bearing surface 621 of the pencil-advancing bearing portion 62, and at the same time, move at most to the limit position of the longitudinal direction of the inverted trapezoid along the inverted trapezoid slit 32 of the movable block 3 toward the longitudinal direction +z, and also press the spring 7 to store potential energy. Further, in one non-limiting embodiment, the pencil sharpening operation is accomplished by rotating an external handle (not shown) of the pencil sharpener clockwise, which in turn drives the drive shaft assembly and the pencil shaft assembly into the pencil by means of the toothed turntable 2 to pull the pencil to the sharpener of the pencil sharpener.

On the other hand, by rotating an external handle (not shown) of the pencil sharpener counterclockwise, the transmission shaft assembly and the pencil feeding shaft assembly are sequentially driven by the toothed turntable 2 to withdraw the pencil so as to withdraw the shaft of the pencil back to the accommodation space between the first pencil feeding shaft elastic roller 51 and the second pencil feeding shaft elastic roller 51 'of the second pencil feeding shaft assembly 5'.

In summary, the present utility model provides a pen feeding and retracting device which is convenient to operate and can be adapted to pencils of different diameters in a stepless and freely adjustable manner without requiring excessive learning cost for a user by utilizing the movable fit between the movable frame and the pen feeding bearing carrier portion to achieve much better versatility than the prior art in implementing pen feeding operation by a toothed turntable and bevel gear transmission. Furthermore, the utility model also avoids the defects of slipping in the pen feeding and retreating process and poor use effect of the pen feeding and retreating device caused by the fact that the existing pen feeding and retreating device is complex in operation, fragile in part structure and easy to wear and break, and further improves the use effects of the pen feeding and retreating device and a pencil sharpener with the pen feeding and retreating device.

Finally, it should be noted that the above embodiments are only for illustrating the technical solution of the present utility model, and are not limiting. Although the present utility model has been described in detail with reference to the embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the present utility model, which is intended to be covered by the appended claims.

Claims (10)

1. The pencil feeding and withdrawing device for pencils with different diameters comprises a base (1), an upper cover (6) and a transmission mechanism arranged between the base (1) and the upper cover (6), wherein the base (1) and the upper cover (6) are respectively provided with a central through hole for a penholder to pass through,

the transmission mechanism comprises a toothed rotary table (2), a transmission shaft assembly, a pen shaft assembly and a movable square frame (3) which are arranged in the inner cavity of the base (1),

-the drive shaft assembly placed in the base (1) comprises a first drive shaft assembly (4) and a second drive shaft assembly (4 ') capable of meshing with the toothed turntable (2), wherein the first drive shaft assembly (4) and the second drive shaft assembly (4') are parallel to each other and each have two helical gears (42, 43;42', 43') with opposite helical angles;

-said pen shaft assembly supportable by a movable frame (3) comprising a first pen shaft assembly (5) and a second pen shaft assembly (5 ') arranged in parallel, wherein said first pen shaft assembly (5) and said second pen shaft assembly (5 ') each have two bevel gears (52, 53;52',53 ') for meshing transmission with bevel gears (42, 43;42',43 ') of said first drive shaft assembly (4) and said second drive shaft assembly (4 '), respectively;

-said upper cover (6) comprises an upper cover panel (64) and a pair of opposed pen-advance bearing-carrying portions (62) insertable into the peripheral wall of said movable frame (3);

-a movable frame (3) operatively engaged with the base (1) with at least one pair of opposed peripheral walls, wherein the peripheral walls have inverted trapezoidal cutouts (32) capable of resting the pencil shaft assemblies to allow the first pencil shaft assembly (5) and the second pencil shaft assembly (5 ') to slide along the inverted trapezoidal cutouts (32) so as to form a space therebetween for insertion of pencils of different diameters, wherein the inverted trapezoidal cutouts (32) are designed to allow the movable frame (3) to move vertically with respect to the base (1) to cooperate with the pencil shaft bearing portion (62) of the upper cover (6) to allow the first pencil shaft assembly (5) resting thereon to remain engaged with the first transmission shaft assembly (4) and the second pencil shaft assembly (5 ') to the second transmission shaft assembly (4 ') during the advance and retreat of pencils.

2. The feeding and withdrawing device for pencils of different diameters according to claim 1, characterized in that said base (1) comprises:

an opposed pair of short cavity walls each having at least one drive shaft support seat (13), wherein the drive shaft support seats (13) are configured with semi-circular depressions adapted to the shaft end shape of the first drive shaft assembly (4) and the second drive shaft assembly (4 ') and allow the first drive shaft assembly (4) and the second drive shaft assembly (4') to swivel within the drive shaft support seat (13) having semi-circular depressions;

A plurality of corner sections each having a lower column (11), wherein a cambered surface-shaped spring blocking wall (14) extending in the longitudinal direction (+Z) of the base (1) and protruding toward the center of the base (1) is respectively configured at the corner sections of the base (1);

a pair of opposed long chamber walls each having at least one base stopper (12); and

and a counter bore (15) which is positioned in the middle of the base (1) and is used for installing the toothed turntable.

3. The feeding and retracting device for pencils of different diameters according to claim 1, wherein,

the first transmission shaft assembly (4) and the second transmission shaft assembly (4') are symmetrically arranged along the longitudinal direction (+X) of the base (1);

the first transmission shaft assembly (4) is provided with a first transmission shaft gear (41) and a first bevel gear (42) which are positioned near a first end (44) and a second bevel gear (43) which is positioned near a second end (45), and the first transmission shaft gear (41) is abutted with the first bevel gear (42) at the end face in the direction of the first end (44);

the second transmission shaft assembly (4 ') is provided with a second transmission shaft gear (41') and a third bevel gear (42 ') which are positioned near a third end (44') and a fourth bevel gear (43 ') which is positioned near a fourth end (45'), and the second transmission shaft gear (41 ') is abutted against the first bevel gear (42) at an end face in the direction toward the third end (44').

4. The feeding and retracting device for pencils of different diameters according to claim 1, wherein,

the first pen shaft assembly (5) is provided with a first outer bevel gear (52) and a second outer bevel gear (53) which are symmetrically arranged near the shaft end, and a first pen shaft elastic roller (51) which is arranged in the middle and takes the shape of a waist, wherein the end face of the first pen shaft elastic roller (51) respectively abuts against the end faces of the first outer bevel gear (52) and the second outer bevel gear (53) towards the axial center point of the first pen shaft assembly (5);

the second pen inlet shaft assembly (5 ') is provided with a third outer bevel gear (52') and a fourth outer bevel gear (53 ') which are symmetrically arranged near the shaft end, and a second pen inlet shaft elastic roller (51') which is arranged in the middle and takes the shape of a waist, and the end face of the second pen inlet shaft elastic roller (51 ') respectively abuts against the end faces of the third outer bevel gear (52') and the fourth outer bevel gear (53 ') towards the axial center point of the second pen inlet shaft assembly (5').

5. The feeding and withdrawal device for pencils of different diameters according to claim 1, characterized in that the movable frame (3) has corner edges in the form of a cambered surface, and that the corner edges of the movable frame (3) have spring support surfaces (31) and upper cylinders (33) for receiving the individual springs (7) on their sides facing the upper cover (6), respectively, wherein the peripheral wall of the movable frame (3) can enclose the peripheral wall of the base (1) in a form-fitting manner.

6. The feeding and retracting device for pencils of different diameters as claimed in claim 1, wherein the feeding bearing-carrying portion (62) of the upper cap (6) extends in a depth direction (-Z) from the upper cap panel (64), wherein

The pen-feeding bearing carrying part (62) is in a right trapezoid shape and is provided with an arc-shaped carrying surface (621) which is symmetrically arranged so as to limit a rotation space of the first pen-feeding shaft assembly (5) and the second pen-feeding shaft assembly (5') together with an inverted trapezoid notch (32) of the movable square frame (3);

the upper cover panel (64) is provided with at least one pair of limit openings (651) at a pair of upper cover edges (65) transverse to the pen-entry bearing carrier portion (62).

7. The feeding and withdrawing device for pencils of different diameters according to claim 5, characterized in that the upper cover (6) further has an upper cover rounded corner (63) conforming to a part of the outer side Zhou Bixiang of the spring (7).

8. The advance and retreat device for pencils of different diameters according to claim 6, wherein a base stopper (12) extends in a longitudinal height direction (+z) from a long cavity wall of the base (1) to be combined with a stopper opening (651) shape of the upper cover panel (64) to define a longitudinal height at which the movable frame (3) is vertically movable with respect to the base (1).

9. The advance and retreat device for pencils of different diameters according to claim 8, wherein the base stopper (12) is configured as a catch or a stopper.

10. A pencil sharpener with a pencil advancing and retreating device, characterized in that the pencil advancing and retreating device is the pencil advancing and retreating device for pencils with different diameters according to any one of claims 1 to 9.