Improved structure of automatic pencil feeding mechanism in pencil sharpener

Abstract

The utility model discloses an improved structure of an automatic pencil feeding mechanism in a pencil sharpener, which comprises a base and a rotating chuck, one side of the base close to the rotating chuck is slidably connected with a gear slider along the diameter direction of the rotating chuck, the gear slider is rotatably connected with a gear shaft, the gear shaft is sleeved with a pencil feeding guide wheel, and a transmission fluted disc is concentrically and rotatably arranged on the base. A polygonal transmission hole in the center of the transmission fluted disc is in transmission connection to a hand-cranking handle of the pencil sharpener, an arc driving groove is formed in the rotating chuck, a driving rod stretching into the arc driving groove is arranged on the gear sliding block, a driving spring is arranged between the base and the rotating chuck, and the end, away from the gear, of the gear shaft is sleeved with a shaft sleeve. A section of gear shaft between the pen feeding guide wheel and the gear is sleeved with a clutch, and clutch helical teeth meshed with the gear clutch helical teeth on the inner side wall of the gear are arranged on the clutch; the pencil feeding device has the advantages of being novel in structure, achieving automatic pencil feeding, automatically stopping pencil feeding and preventing the pencils from being cut continuously.

Description

Technical Field

[0001] This utility model relates to a clutch mechanism in a pencil sharpener, and more particularly to an improved structure of an automatic pencil feeding mechanism in a pencil sharpener. Background Technology

[0002] Pencil sharpeners are commonly used pencil-cutting tools by students. However, existing pencil sharpeners do not automatically stop cutting the pencil after it has been sharpened, which leads to waste of pencils and affects the quality of the pencil sharpener. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide an improved structure for the automatic pen feeding mechanism in a pencil sharpener, addressing the shortcomings of the existing technology.

[0004] To achieve the above objectives, the present invention adopts the following measures:

[0005] An improved structure of an automatic pen feeding mechanism in a pencil sharpener includes a base and a rotating chuck, which are arranged opposite to each other. A pen-passing hole is provided in the middle of the rotating chuck. A gear slider is slidably connected to the side of the base near the rotating chuck along its diameter. A gear shaft is rotatably connected to the gear slider. A pen-feeding guide wheel is sleeved on the gear shaft. A transmission gear plate is concentrically rotatably provided on the base. The side of the transmission gear plate near the gear slider has several teeth for driving to the gear on the gear shaft. A polygonal transmission hole in the center of the transmission gear plate is connected to the hand crank handle of the pencil sharpener. An arc drive groove is provided on the rotating chuck. A drive rod is provided on the gear slider for extending into the arc drive groove. A drive spring is provided between the base and the rotating chuck. One end of the drive spring presses against the base, and the other end presses against the rotating chuck. A bushing is sleeved on the end of the gear shaft away from the gear. A clutch is sleeved on a section of the gear shaft between the pen-feeding guide wheel and the gear. The clutch has clutch helical teeth that mesh with the gear clutch helical teeth on the inner side wall of the gear.

[0006] The base has a base groove along the diameter direction, and the slide plate on the gear slider is slidably connected to the base groove;

[0007] The base is provided with a base spring seat, and the rotary chuck is provided with a chuck spring seat. A spring mounting space is formed between the base spring seat and the chuck spring seat. The drive spring is located in the spring mounting space, with one end of the drive spring pressing against the chuck spring seat and the other end pressing against the base spring seat.

[0008] The gear slider, gear shaft and pen feeding guide wheel are provided in three sets, which form an equilateral triangle, and three driving springs are provided accordingly;

[0009] The aforementioned teeth form a circular structure concentric with the polygonal transmission hole.

[0010] The beneficial effects of this utility model are: practicality, novel structure, automatic pencil feeding during pencil cutting, automatic stopping of pencil feeding after the pencil is cut, thus avoiding continuous cutting of the pencil. Attached Figure Description

[0011] Figure 1 This is an exploded structural diagram of the present invention.

[0012] Figure 2 This is an exploded view of the transmission gear disc of this utility model.

[0013] Figure 3 This is an exploded view of the clutch assembly structure of this utility model. Detailed Implementation

[0014] An improved structure of an automatic pen feeding mechanism in a pencil sharpener includes a base 1 and a rotating chuck 2, which are arranged opposite to each other. A pen-passing hole 203 is provided in the center of the rotating chuck 2. A gear slider 3 is slidably connected to the side of the base 1 near the rotating chuck 2 along its diameter. A gear shaft 4 is rotatably connected to the gear slider 3, and a pen-feeding guide wheel 5 is sleeved on the gear shaft 4. A transmission gear plate 6 is concentrically rotatably mounted on the base 1. The side of the transmission gear plate 6 near the gear slider 3 has several teeth 601 for transmitting power to the gear 401 on the gear shaft 4. A polygonal transmission hole 602 at the center of the transmission gear plate 6 is connected to... The hand crank of the pencil sharpener has an arc drive groove 201 on the rotating chuck 2. The gear slider 3 has a drive rod 301 that extends into the arc drive groove 201. A drive spring 7 is provided between the base 1 and the rotating chuck 2. One end of the drive spring 7 presses against the base 1 and the other end presses against the rotating chuck 2. A bushing 9 is fitted on the end of the gear shaft 4 away from the gear 401. A clutch 8 is fitted on a section of the gear shaft 4 between the pen feed guide wheel 5 and the gear 401. The clutch 8 has a clutch helical tooth 801 that meshes with the gear clutch helical tooth 402 on the inner side wall of the gear 401.

[0015] The base 1 has a base groove 102 along the diameter direction, and the slide plate 302 on the gear slider 3 is slidably connected to the base groove 102.

[0016] The base 1 is provided with a base spring seat 103, and the rotary chuck 2 is provided with a chuck spring seat 202. A spring mounting space is formed between the base spring seat 103 and the chuck spring seat 202. The drive spring 7 is located in the spring mounting space. The drive spring 7 presses against the chuck spring seat 202 at one end and against the base spring seat 103 at the other end.

[0017] The gear slider 3, gear shaft 4 and pen feeding guide wheel 5 are provided in three sets, forming an equilateral triangle, and the drive spring 7 is provided in three sets.

[0018] The aforementioned teeth 601 form a circular structure concentrically arranged with the polygonal transmission hole 602.

[0019] like Figure 1-3 As shown, in its natural state when the pencil is not sharpened, it is driven by the elastic force of the drive spring 7. The elastic force of the drive spring 7 drives the rotating chuck 2 to rotate. When rotating, the drive rod 301 slides within the arc drive groove 201 of the rotating chuck 2. The drive rod 301 then drives the gear slider 3 to move towards the center along the diameter direction of the base 1. At this time, the equilateral triangle formed by the three pencil feeding guide wheels 5 is in its smallest state. When sharpening the pencil, the pencil is inserted through the pencil hole 203 and continues until it is inserted into the equilateral triangle formed by the pencil feeding guide wheels 5. Under the elastic force of the drive spring 7, the pencil feeding guide wheels 5 clamp the pencil.

[0020] When the pencil sharpener is rotating and cutting the pencil, the hand crank drives the transmission gear plate 6 to rotate via the transmission structure. The teeth 601 of the transmission gear plate 6 drive the gear 401 and the gear shaft 4 to rotate together. The pencil feed guide wheel 5 on the gear shaft 4 rotates accordingly. When the pencil feed guide wheel 5 rotates, it feeds the pencil held between the pencil feed guide wheel 5 inward, realizing automatic pencil feeding. As the pencil continues to cut, when the pencil is sharpened, as the resistance increases, when the resistance exceeds the elastic force of the drive spring 7, the clutch helical teeth 801 on the clutch 8 and the gear clutch helical teeth 402 on the gear 401 will slide relative to each other, realizing disengagement. After disengagement, the pencil feed guide wheel 5 stops rotating, and the entire mechanism also stops feeding pencils.

Claims

1. An improved structure of an automatic pen feeding mechanism in a pencil sharpener, comprising a base (1) and a rotating chuck (2), the base (1) and the rotating chuck (2) being arranged opposite to each other, the rotating chuck (2) having a pen-passing hole (203) in the middle, a gear slider (3) being slidably connected to the side of the base (1) near the rotating chuck (2) along its diameter direction, a gear shaft (4) being rotatably connected to the gear slider (3), a pen-feeding guide wheel (5) being sleeved on the gear shaft (4), a transmission gear plate (6) being concentrically rotatably provided on the base (1), the transmission gear plate (6) being provided with a gear slider (3) on the side near the gear slider (3) The device has several teeth (601) on a gear (401) that is driven to a gear shaft (4). A polygonal transmission hole (602) in the center of the transmission gear disk (6) is connected to the hand crank handle of the pencil sharpener. An arc drive groove (201) is provided on the rotating chuck (2). A drive rod (301) is provided on the gear slider (3) that extends into the arc drive groove (201). A drive spring (7) is provided between the base (1) and the rotating chuck (2). One end of the drive spring (7) presses against the base (1), and the other end presses against the rotating chuck (2). The device is characterized by: A bushing (9) is fitted on one end of the gear shaft (4) away from the gear (401). A clutch (8) is fitted on a section of the gear shaft (4) between the pen feed guide wheel (5) and the gear (401). The clutch (8) is provided with clutch helical teeth (801) that mesh with the gear clutch helical teeth (402) on the inner side wall of the gear (401).

2. The improved structure of the automatic pen feeding mechanism in a pencil sharpener according to claim 1, characterized in that: The base (1) is provided with a base groove (102) along the diameter direction, and the slide plate (302) on the gear slider (3) is slidably connected to the base groove (102).

3. An improved structure of the automatic pen feeding mechanism in a pencil sharpener according to claim 1 or 2, characterized in that: The base (1) is provided with a base spring seat (103), and the rotary chuck (2) is provided with a chuck spring seat (202). A spring mounting space is formed between the base spring seat (103) and the chuck spring seat (202). The drive spring (7) is located in the spring mounting space. One end of the drive spring (7) presses against the chuck spring seat (202), and the other end presses against the base spring seat (103).

4. An improved structure of the automatic pen feeding mechanism in a pencil sharpener according to claim 3, characterized in that: The gear slider (3), gear shaft (4) and pen feeding guide wheel (5) are provided in three sets, forming an equilateral triangle, and the drive spring (7) is provided in three sets.

5. An improved structure of the automatic pen feeding mechanism in a pencil sharpener according to claim 4, characterized in that: The aforementioned teeth (601) form a circular structure concentrically arranged with the polygonal transmission hole (602).

Images