CN219544390U - Automatic advance and withdraw mechanism and have pencil sharpener of this mechanism - Google Patents

Abstract

The utility model discloses an automatic pen feeding and withdrawing mechanism and a pencil sharpener with the same, wherein the automatic pen feeding and withdrawing mechanism comprises a worm and a gear shifting gear, the gear shifting gear is arranged on the worm, the gear shifting gear is meshed with a forward rotation gear when feeding a pencil, and the gear shifting gear is meshed with a reverse rotation gear when withdrawing the pencil. The utility model provides an automatic pen feeding and withdrawing mechanism, which does not need to change the steering direction of a motor in the transition process between pen feeding and withdrawing, but realizes the conversion of the rotation direction of a worm through the position conversion of a gear shifting gear, thereby converting pen feeding and withdrawing operations.

Description

Automatic advance and withdraw mechanism and have pencil sharpener of this mechanism

Technical Field

The utility model relates to the technical field of pencil cutters, in particular to an automatic pencil feeding and withdrawing mechanism and a pencil cutter with the same.

Background

In the chinese patent application publication No. CN110843391a, an electric pencil sharpener is disclosed, wherein the pencil feeding transmission mechanism comprises a motor output worm and a connecting gear, and the motor output worm is meshed with the connecting gear. The working principle is that the motor output worm is used for driving the pen feeding and retreating assembly to do pen feeding or retreating operation through the driving of the connecting gear.

Most of the prior art including the above patent schemes realize the conversion of pen feeding and retracting operations by changing the steering direction of a motor shaft. However, in the transition process between the pen advance and the pen retreat, the motor shaft scram and reverse rotation can cause the motor to be instantly overloaded, and the motor can be possibly damaged, so that the service life of the motor is influenced. In order to solve this problem, the present utility model proposes the following improvements.

Disclosure of Invention

The present utility model aims to solve one of the technical problems in the related art to a certain extent. Therefore, the utility model provides an automatic pen feeding and withdrawing mechanism, which does not need to change the steering direction of a motor in the transition process between pen feeding and withdrawing, and realizes the conversion of the rotation direction of the worm through the position conversion of the gear shifting gear, thereby converting pen feeding and withdrawing operations.

The utility model also provides a pencil sharpener comprising the automatic pencil advancing and retreating mechanism.

The technical scheme adopted by the utility model is as follows: the automatic pen feeding and retreating mechanism comprises a worm and a gear shifting gear, wherein the gear shifting gear is arranged on the worm, the gear shifting gear is meshed and connected with a forward rotating gear when a pen is fed, and the gear shifting gear is meshed and connected with a reverse rotating gear when the pen is retreated.

The utility model provides an improvement scheme, wherein the motor steering is not required to be changed in the transition process between the pen feeding and the pen withdrawing, and the gear engagement of the gear shifting gear and different steering gears is realized through the position conversion of the gear shifting gear, so that the conversion of the rotation direction of the worm is realized, and the pen feeding and the pen withdrawing operation is converted. Compared with the prior art, the scheme avoids the occurrence of the emergency stop and reverse rotation condition of the motor shaft, reduces the possibility of motor damage, and prolongs the service life of the automatic pen feeding and retreating mechanism.

According to one embodiment of the utility model, the gear shift gear is in torque-transmitting sliding fit with the worm or is fixedly arranged on the worm and moves axially along with the worm; the purpose of the above arrangement is to shift the gear wheel axially between different positions to change the direction of rotation of the worm.

According to one embodiment of the utility model, the automatic pen feeding and retreating mechanism further comprises a shifting fork rod, and the shifting gear is propped against a forward rotating surface on the shifting fork rod when a pen is fed; the arrangement of the forward rotating surface keeps the gear shifting gear at the position meshed with the forward rotating gear, so that the automatic pen feeding and retreating mechanism can perform pen feeding operation.

According to one embodiment of the utility model, the shift gear is abutted against a reversing surface on the shifting fork rod when the pen is withdrawn; the arrangement of the reversing surface keeps the gear shift gear at the position meshed with the reversing gear, so that the automatic pen feeding and withdrawing mechanism can do pen withdrawing operation.

According to one embodiment of the utility model, the worm is sleeved with a first elastic piece which is propped against the gear shifting gear, and the first elastic piece has an elastic tendency to prop the gear shifting gear against the forward rotation surface and/or the reverse rotation surface.

According to one embodiment of the utility model, the worm has a first splined portion, and the shift gear has a splined hole adapted to the first splined portion; by matching the first spline part with the spline hole, the shift gear can move on the worm along the axial direction of the worm and can be connected with the worm in a torque transmission manner.

According to one embodiment of the utility model, the worm has helical teeth for engagement with the pen advance and retreat assembly.

According to one embodiment of the utility model, a second elastic member is connected to the fork lever, the second elastic member having an elastic tendency to bring the forward rotation surface or the reverse rotation surface against the shift gear.

A pencil sharpener comprising any one of the above automatic pencil feeding and retracting mechanisms.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings can be obtained according to these drawings without inventive effort to a person skilled in the art.

FIG. 1 is a perspective view of an automatic pen advance and retreat mechanism in a pen advance according to an embodiment of the present utility model;

FIG. 2 is a perspective view of an automatic pen advance and retreat mechanism according to an embodiment of the present utility model;

FIG. 3 is a schematic view of a fork lever in an inverted configuration according to an embodiment of the present utility model;

FIG. 4 is a schematic view of a worm in an embodiment of the utility model;

FIG. 5 is a schematic diagram of a shift gear in an embodiment of the present utility model;

FIG. 6 is a schematic diagram of the structure of the automatic pen feeding and retracting mechanism in the embodiment of the utility model;

FIG. 7 is a schematic diagram of the structure of the automatic pen feeding and discharging mechanism in the embodiment of the utility model;

fig. 8 is a schematic view of a pencil sharpener according to an embodiment of the present utility model.

The reference numerals in the figures illustrate:

1. a worm; 2. a shift gear; 3. a forward rotation gear; 4. a reversing gear; 5. a pen feeding and retracting assembly; 6. a fork lever; 7. a first elastic member; 8. a motor; 9. a first delay gear; 10. a second delay gear; 11. a second elastic member; 12. a support table; 13. an upper cover; 14. a main body;

1a, a first spline portion; 1b, helical teeth;

2a, spline holes;

6a, a forward rotating surface; 6b, reversing the surface; 6c, a second spline portion; 6d, connecting part.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.

As shown in fig. 1 to 8, in the present embodiment, an automatic pen feeding and withdrawing mechanism is disclosed, which includes a worm 1 and a gear shift gear 2, the gear shift gear 2 is slidably engaged with the worm 1 in a torque-transmissible manner, the gear shift gear 2 is engaged with a forward rotation gear 3 during pen feeding, and the gear shift gear 2 is engaged with a reverse rotation gear 4 during pen withdrawing.

Further, as shown in fig. 1 and 2, at least one forward rotation gear 3 and at least one reverse rotation gear 4 are alternately meshed to form a reduction gear set. The gears on the shaft of the motor 8 are meshed with the first-stage gears in the reduction gear set, so that all stages of gears in the reduction gear set are driven to rotate. In this embodiment, the reduction gear set is a three stage gear set in which the first and third stage gears turn in unison and the second stage gear turns in opposition to the first stage gear.

Further, in the present embodiment, the third stage gear is a forward rotation gear 3, and the second stage gear is a reverse rotation gear 4. Wherein the forward rotation gear 3 is coupled with the bottom of the tool rest through a driving shaft, so that the tool rest synchronously rotates along with the forward rotation gear 3.

Further, in this embodiment, the worm 1 is vertically disposed, the upper end of the worm 1 has a spiral tooth portion 1b, and the pen feeding and retracting assembly 5 includes two pen feeding rubber rollers disposed along a horizontal direction. The two pen feeding rubber rollers are arranged in parallel and are meshed with each other through gears. One of the pen-feeding rubber rollers is provided with a gear structure for meshing with the spiral tooth part 1 b. When the worm 1 rotates, the spiral tooth part 1b drives the two pen feeding rubber rollers to synchronously and reversely rotate through the gear structure. Namely, when the worm 1 rotates, the screw tooth portion 1b drives the pen feeding and retreating assembly 5 to perform pen feeding or pen retreating operation.

Further, as shown in fig. 4 and 5, the lower portion of the worm 1 has a first spline portion 1a, and the shift gear 2 has a spline hole 2a that is fitted with the first spline portion 1 a. The splined hole 2a cooperates with the first splined portion 1a to achieve a torque-transmissible sliding fit of the shift gear 2 with the worm 1.

Further, as shown in fig. 6, the lower end of the worm 1 is a cylindrical structure, and the worm 1 can rotate around its own axis relative to the support table 12 by matching the cylindrical structure with the through hole on the support table 12. The worm 1 is sleeved with a first elastic piece 7, one end of the first elastic piece 7 is propped against the gear shifting gear 2, and the other end of the first elastic piece is propped against the table top of the supporting table 12. The first elastic member 7 has an elastic tendency to move the shift gear 2 in a direction away from the support table 12.

Further, in another embodiment, the shift gear 2 is fixedly mounted on the worm 1, i.e. the shift gear 2 moves up and down with the worm 1 as a whole. Correspondingly, the worm 1 is elastically connected with the supporting table 12, namely the first elastic piece 7 is sleeved on the worm 1, the lower end of the first elastic piece 7 is propped against the supporting table 12, and the upper end of the first elastic piece is propped against the gear shifting gear 2 on the rod body of the worm 1. Correspondingly, the spiral tooth part 1b at the upper end of the worm 1 is replaced by a spur gear structure, and a worm wheel meshed with the spur gear structure is coaxially arranged on one pen feeding rubber roller in the pen feeding and retreating assembly 5. By the axial movement of the worm 1 as a whole, the shift gear 2 is switched between a pen-in position engaged with the forward rotation gear 3 and a pen-out position engaged with the reverse rotation gear 4.

Specifically, as shown in fig. 2 and 3, the automatic pen feeding and retreating mechanism further includes a fork rod 6, and when a pen is fed, the shift gear 2 abuts against a forward rotation surface 6a on the fork rod 6; when the pen is withdrawn, the shift gear 2 is abutted against the reversing surface 6b on the shifting fork rod 6.

Further, the outer periphery of the shift lever 6 has a convex structure extending outward, on which both the forward rotation surface 6a and the reverse rotation surface 6b are located. In the axial direction of the fork rod 6, a height difference exists between the forward rotation surface 6a and the reverse rotation surface 6b, and the forward rotation surface 6a and the reverse rotation surface 6b are arranged in an axial dislocation manner. In the running process of the automatic pen feeding and withdrawing mechanism, the protruding structures are all located above the gear shifting gears 2, so the first elastic piece 7 has an elastic tendency to enable the gear shifting gears 2 to be propped against the forward rotating surface 6a and/or the reverse rotating surface 6 b.

Further, in the present embodiment, the fork lever 6 is mounted on the support table 12, and the fork lever 6 is rotatable about its own axis with respect to the support table 12. During rotation of the shift lever 6, the shift gear 2 is guided from abutting against the forward rotation surface 6a to abutting against the reverse rotation surface 6b or the shift gear 2 is guided from abutting against the reverse rotation surface 6b to abutting against the forward rotation surface 6a by a transition surface between the forward rotation surface 6a and the reverse rotation surface 6 b.

Further, in this embodiment, the fork rod 6 is provided with a connection portion 6d, the connection portion 6d is connected with a second elastic member 11 disposed transversely, the other end of the second elastic member 11 is connected with the support table 12, the second elastic member 11 automatically returns the fork rod 6 to the initial position, and the forward rotation surface 6a abuts against the shift gear 2 at the initial position.

Further, as shown in fig. 6, the lower part of the supporting table 12 is elastically connected with a first delay gear 9, the upper end of the first delay gear 9 is slidably matched with the lower end of the driving shaft in a torque-transmitting manner, and the connecting rod in the driving shaft abuts against the first delay gear 9. When the knife rest is connected with the driving shaft, the upper end of the connecting rod is propped against the pen blocking block on the knife rest. The lower end of the shifting fork lever 6 is provided with a second spline portion 6c, and a second delay gear 10 is connected by a key of the second spline portion 6 c.

In this embodiment, the working principle of the automatic pen feeding and retracting mechanism is as follows:

the motor 8 drives the forward rotation gear 3 to rotate, and the forward rotation gear 3 drives the knife rest to synchronously rotate through the driving shaft. Meanwhile, the forward rotating gear 3 drives the pen feeding and retreating assembly 5 to perform pen feeding through the worm 1, and the pencil is continuously fed, and meanwhile, the pencil is sharpened by the knife rest. Until the pen tip of the pencil moves downwards, the pen blocking block drives the first delay gear 9 through the connecting rod, and the first delay gear 9 moves from a position separated from the second delay gear 10 to a position meshed with the second delay gear 10. The drive shaft drives the second delay gear 10 through the first delay gear 9 to rotate about the axis of the fork lever 6. The shifting fork 6 integrally rotates along with the second delay gear 10, the shifting gear 2 moves upwards along the axial direction of the worm 1 under the action of the first elastic piece 7, and the shifting gear 2 is guided against the forward rotating surface 6a to be against the reverse rotating surface 6b, namely, the shifting gear 2 is meshed with the forward rotating gear 3 to be meshed with the reverse rotating gear 4. The worm 1 rotates reversely, the pen feeding and withdrawing assembly 5 is driven to withdraw the pencil until the pencil withdraws, and the shifting fork rod 6 rotates to automatically reset under the action of the second elastic piece 11, namely the gear shifting gear 2 is meshed with the reversing gear 4 and is converted into being meshed with the forward gear 3.

Referring to fig. 8, another embodiment of a pencil sharpener is disclosed, including the automatic pencil feeding and retracting mechanism described in this embodiment.

Further, in another embodiment, the pen advance and retreat assembly 5 is mounted in the upper cover 13. When the upper cover 13 is in cover connection with the pencil sharpener main body 14, the spiral tooth part 1b on the worm 1 extends into the upper cover 13 and is in meshed connection with the gear structure in the pencil advancing and retreating component 5.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature "above," "over" and "on" a second feature may be a first feature directly above or obliquely above the second feature, or simply indicate that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

While embodiments of the present utility model have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the utility model, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the utility model.

Claims (9)

1. An automatic advance and withdraw pen mechanism which is characterized in that: the pen feeding device comprises a worm and a gear shifting gear, wherein the gear shifting gear is arranged on the worm, the gear shifting gear is meshed and connected with a forward rotation gear when a pen is fed, and the gear shifting gear is meshed and connected with a reverse rotation gear when the pen is withdrawn.

2. An automatic pen advance and retreat mechanism according to claim 1, wherein: the gear shifting gear is in sliding fit with the worm in a torque transmission manner, or the gear shifting gear is fixedly arranged on the worm and moves axially along with the worm.

3. An automatic pen advance and retreat mechanism according to claim 1, wherein: the pen-feeding device also comprises a shifting fork rod, wherein the shifting gear is propped against a forward rotating surface on the shifting fork rod when a pen is fed.

4. An automatic pen advance and retreat mechanism according to claim 3, wherein: when the pen is withdrawn, the shift gear is abutted against the reversing surface on the shifting fork rod.

5. The automatic pen feeding and retracting mechanism according to claim 4, wherein: the worm is sleeved with a first elastic piece which is propped against the gear shifting gear.

6. An automatic pen advance and retreat mechanism according to claim 1, wherein: the worm has a first splined portion and the shift gear has a splined bore that mates with the first splined portion.

7. An automatic pen advance and retreat mechanism according to claim 1, wherein: the worm has a helical tooth for engagement with the pen advance and retreat assembly.

8. An automatic pen advance and retreat mechanism according to claim 3, wherein: the shifting fork rod is connected with a second elastic piece.

9. A pencil sharpener, characterized in that: comprising an automatic pen advance and retreat mechanism according to any of claims 1 to 8.