Three-jaw pencil feeder

Abstract

The three-jaw pencil feeder comprises the power gear, the base plate, the transmission shaft, the pencil clamping device and the shell, the elastic piece is adopted to replace a torsional spring, the material cost is reduced, and installation is more convenient and faster; the three rotary supports are connected end to end in the mode that the guide columns are connected with the guide grooves and are evenly distributed, the center is stable, triangular positioning can be achieved without cooperation of a synchronous disc, a penholder is evenly stressed and stable and does not deviate in the pen feeding process, the refill breaking risk is reduced, the material cost is further reduced, and installation is more convenient and faster. The three rotating supports jointly disperse the acting force, the elastic force interval is larger, and the adaptability is better.

Description

Technical Field

[0001] The utility model relates to the field of stationery, and specifically relates to an automatic pen feeder for a pencil sharpener, specifically a three-claw pen feeder. Background Art

[0002] Most of the existing pen feeders adopt a two-claw structure, and the elastic force is generated on the bracket of the pen feeder. When sharpening a triangular pencil, the acting force is uneven, which easily causes the center to shift, easily breaks the core, and has poor adaptability to sizes. The applicant developed a utility model patent with the application number 202421107663.9, which uses 3 rotating brackets and torsion springs to disperse the acting force, and through a synchronous disk and triangular positioning, the pen rod is evenly stressed during the pen feeding process, stable without deviation, reducing the risk of broken cores. However, using torsion springs has problems such as difficult installation and high costs. Summary of the Utility Model

[0003] In view of the defects of the existing three-claw pen feeder, the technical problem to be solved by the utility model is to provide a three-claw pen feeder with a stable pen feeding center, convenient and fast installation, and lower cost.

[0004] To achieve the above object, according to one aspect of the utility model, the utility model is realized by the following technical measures: A three-claw pen feeder, including a power gear, a chassis, a transmission shaft, a pen clamping device, and a housing. The housing, the chassis, and the power gear are provided with a central hole for the pen rod to pass through. The transmission shaft is installed on the chassis. There are three pen clamping devices, and each pen clamping device includes a rotating bracket, a pen feeding wheel, a positioning wheel, a helical gear, and a rotating shaft. The pen feeding wheel, the positioning wheel, and the helical gear are sequentially sleeved on the rotating shaft, and the rotating shaft is sleeved in the rotating bracket. The transmission shaft is provided with a screw meshing with the helical gear and a gear meshing with the power gear. The rotating bracket is provided with a spring piece, and the free end of the spring piece abuts against the housing.

[0005] Further, the housing is provided with a spring piece supporting surface, and the spring piece abuts against the spring piece supporting surface.

[0006] Further, the spring piece is arc-shaped.

[0007] Further, the chassis and the housing are provided with evenly distributed transmission shaft holes, and the transmission shaft is installed in the transmission shaft holes on the chassis and the housing.

[0008] Further, the rotating bracket is provided with a guiding groove and a guiding post. The guiding post of the rotating bracket is arranged in the guiding groove of another rotating bracket. The three rotating brackets are connected end to end by the guiding post connecting the guiding groove. One end of the rotating bracket is provided with a connecting hole, and the rotating bracket is sleeved on the transmission shaft through the connecting hole.

[0009] Further, support columns are provided on the chassis, a support plane is provided at the bottom of the rotary bracket, and the support plane is placed on the support columns.

[0010] Further, positioning holes are provided on the rotary bracket, and the rotating shaft is fixed in the positioning holes.

[0011] Further, a plurality of card holes are provided on the outer circle of the chassis, a plurality of card feet are provided on the outer circle of the housing, and the housing is fixed on the chassis through the card feet and the card holes.

[0012] Compared with the prior art, the advantages of the present utility model are as follows: The use of elastic pieces to replace torsion springs reduces the material cost and is more convenient and faster to install; the three rotary brackets are connected end to end by the way of the guide posts connecting the guide grooves, are evenly distributed and have a stable center, and can achieve triangular positioning without the cooperation of a synchronous disk, so that the pen rod is evenly stressed during the pen feeding process, is stable and does not deviate, reduces the risk of broken cores, further reduces the material cost, and is more convenient and faster to install; the three rotary brackets jointly disperse the acting force, have a larger elastic force range and better adaptability. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The drawings constituting a part of the present utility model are used to provide a further understanding of the present utility model. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation to the present utility model. In the drawings:

[0014] Figure 1 is a schematic diagram of the overall structure of the three-jaw pen feeder described in the present utility model;

[0015] Figure 2 is an exploded structure diagram of the three-jaw pen feeder described in the present utility model;

[0016] Figure 3 is a schematic diagram of the structure of the rotary bracket described in the present utility model.

[0017] Description of the reference numerals: 1, chassis; 2, power gear; 3, housing; 4, transmission shaft; 5, rotary bracket; 6, rotating shaft; 7, pen feeding wheel; 8, positioning wheel; 9, helical gear; 10, screw; 11, gear; 12, center hole; 13, transmission shaft hole; 14, card hole; 15, support column; 16, elastic piece support surface; 17, card foot; 18, positioning hole; 19, guide groove; 20, guide post; 21, elastic piece; 22, support plane; 23, connection hole. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] The present utility model will be described in detail below with reference to the drawings and in conjunction with the embodiments. It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

[0019] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "bottom", "top", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0020] Please refer to Figures 1 - 3 , the three-jaw pen feeder provided in this embodiment includes a chassis 1, a power gear 2, a housing 3, a transmission shaft 4, and a pen clamping device. Central holes 12 for the pen shaft to pass through are provided on the chassis 1, the power gear 2, and the housing 3. Three uniformly distributed transmission shaft holes 13 and three uniformly distributed support columns 15 are provided on the chassis 1, and a number of card holes 14 are provided on the outer ring. After passing through the central hole 12 of the chassis 1, the power gear 2 meshes with the gear 11 on the transmission shaft 4 for transmission; three transmission shaft holes 13 corresponding to the transmission shaft holes 13 on the chassis 1 are provided on the housing 3. A number of elastic sheet support surfaces 16 are provided on the inner wall of the housing 3, and a number of card feet 17 are provided on the outer ring of the housing 3. The housing 3 is connected to the card holes 14 to fix the chassis 1; a gear 11 and a screw 10 are provided on the transmission shaft 4. The gear 11 meshes with the power gear 2. One end of the transmission shaft 4 is connected to the transmission shaft hole 13 of the chassis 1, and the other end is connected to the transmission shaft hole 13 of the housing 3. The transmission shaft 4 can rotate in the transmission shaft hole 13; there are three pen clamping devices, and each pen clamping device includes a rotating bracket 5, a rotating shaft 6, a pen feeding wheel 7, a positioning wheel 8, and a helical gear 9. A guide groove 19 and a guide post 20 are provided on the rotating bracket 5. The guide post 20 of the rotating bracket 5 is sleeved in the guide groove 19 of another rotating bracket 5. The three rotating brackets 5 are connected end to end by the guide post 20 connecting the guide groove 19. One end of the rotating bracket 5 is provided with a connection hole 23. The rotating bracket 5 is sleeved on the transmission shaft 4 through the connection hole 23. The rotating bracket 5 is also provided with two positioning holes 18. The rotating shaft 6 is fixed in the positioning holes 18. The pen feeding wheel, the positioning wheel 8, and the helical gear 9 are sequentially sleeved on the rotating shaft 6. The helical gear 9 meshes with the screw 10. An elastic sheet 21 is provided on one side of the rotating bracket 5. The elastic sheet 21 is preferably arc-shaped. The arc of the elastic sheet 21 can be a positive bracket arc or a negative bracket arc. The free end of the elastic sheet 21 abuts against the elastic sheet support surface 16 of the housing 3. A support plane 22 is provided at the bottom of the rotating bracket 5. The support plane 22 is placed on the support column 15 of the chassis 1.

[0021] The three-jaw pen feeder provided in this embodiment, when the pencil sharpener is working, after inserting the pen between the three pen feed wheels 7, it will push the pen feed wheels 7 outward. At this time, the pen feed wheels 7 push the rotating bracket 5 through the rotating shaft 6. Since the rotating bracket 5 is sleeved on the transmission shaft 4, the rotating bracket 5 will rotate outward with the transmission shaft 4 as the center. At this time, the rotating bracket 5 drives the elastic piece 21 to displace outward. Since the other end of the elastic piece 21 abuts against the elastic piece support surface 16 of the housing 3, the elastic piece 21 deforms under the drive of the rotating bracket 5. The elastic force generated by the deformation of the elastic piece 21 acts on the pen feed wheels 7 through the conduction of the rotating bracket 5 and the rotating shaft 6, and can clamp the entering pen. Then, the power of the rotation of the cutting part drives the power gear 2 to rotate, thereby driving the transmission shaft 4 to rotate. The screw 10 of the transmission shaft 4 drives the helical gear 9 to rotate, and the helical gear 9 drives the pen feed wheels 7 to rotate through the rotating shaft 6. The rotation of the pen feed wheels 7 drives the pen to enter the pencil sharpener for sharpening; because the three rotating brackets 5 are connected end to end by the way that the guide posts 20 are connected to the guide grooves 19, the guide posts 20 will move in the guide grooves 19 after the rotating brackets 5 rotate. The three rotating brackets 5 are stressed simultaneously to share the acting force, so that the three rotating brackets 5 can adapt to the displacement distance by themselves and can maintain the center stability. The pen feed wheels 7 follow the rotating brackets 5 to make way for the pen feeding space, and triangular positioning can be realized without the cooperation of the synchronizing disk. During the pen feeding process, the pen rod is evenly stressed, stable and does not deviate, reducing the risk of broken cores, and further reducing the material cost, and the installation is more convenient and fast; the three rotating brackets 5 jointly disperse the acting force, the elastic force interval is larger, and the adaptability is better.

[0022] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and variations. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A three-claw pen feeder, comprising a power gear, a chassis, a transmission shaft, a pen clamping device, and a housing, characterized in that: The chassis and the power gear are provided with a central hole for the pen shaft to pass through, the transmission shaft is installed on the chassis, there are three pen clamping devices, the pen clamping devices include a rotating bracket, a pen feeding wheel, a positioning wheel, a bevel gear, and a rotating shaft, the pen feeding wheel, the positioning wheel, and the bevel gear are sequentially sleeved on the rotating shaft, the rotating shaft is sleeved on the rotating bracket, the transmission shaft is provided with a screw rod meshing with the bevel gear for transmission, and a gear meshing with the power gear for transmission, the rotating bracket is provided with a spring sheet, and the free end of the spring sheet is against the outer shell.

2. The three-claw pen feeder according to claim 1, characterized in that: The shell is provided with an elastic sheet supporting surface, and the elastic sheet is supported on the elastic sheet supporting surface.

3. The three-claw pen feeder according to claim 2, characterized in that: The spring piece is arc-shaped.

4. The three-claw pen feeder according to claim 1, characterized in that: The chassis and the shell are provided with evenly distributed transmission shaft holes, and the transmission shaft is installed in the transmission shaft holes on the chassis and the shell.

5. The three-claw pen feeder according to claim 1, characterized in that: The rotating bracket is provided with a guide groove and a guide column. The guide column of the rotating bracket is arranged in the guide groove of another rotating bracket. The three rotating brackets are connected end to end by connecting the guide column to the guide groove. A connecting hole is provided at one end of the rotating bracket, and the rotating bracket is sleeved on the transmission shaft through the connecting hole.

6. The three-claw pen feeder according to claim 5, characterized in that: A supporting column is arranged on the chassis, and a supporting plane is arranged at the bottom of the rotating bracket, and the supporting plane is placed on the supporting column.

7. The three-claw pen feeder according to claim 1, characterized in that: The rotating bracket is provided with a positioning hole, and the rotating shaft is fixed in the positioning hole.

8. The three-claw pen feeder according to claim 1, characterized in that: The outer ring of the chassis is provided with a plurality of clamping holes, the outer ring of the shell is provided with a plurality of clamping feet, and the shell is fixed on the chassis through the clamping feet and the clamping holes.

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