Structure of automatic pencil sharpener

An automatic pencil sharpener has a plurality of different sizes of pencil selector openings in a front side of a pencil selector panel, and an annulus groove at the back side of the pencil selector panel for mounting the trigger. Accordingly, the pencil inserted into the pencil receiving opening will keep a constant distance with the trigger switch, regardless of the sizes of the pencil inserted, thereby smoothing the pencil operation in the device.

BACKGROUND OF THE INVENTION

I. Field of the Invention

The present invention relates to a device of an automatic pencil sharpener.” In particular, the present invention relates to an improvement on the pencil selector panel which changes the position of the trigger switch with the rotation of the pencil selector panel to adjust the suitable pencil size.

II. Description of the Prior Art

A pencil is usually used in writing, artifact, and industrial drawing. In our daily life, there are various kinds of pencils (such as conventional, automatic, magic pencils, etc.). A conventional lead pencil has to be sharpened by a pencil sharpener from time to time. The wood covering the pencil lead needs to be sharpened into an appropriate conical shape to expose the lead. Therefore, it takes time to sharpen a conventional lead pencil manually. For most of consumers, it is difficult to sharpen the lead pencil manually into a good looking shape. The shape of the pencil will influence the mood of the user and may affect the way in which the user holds the pencil. Therefore, the pencil sharpening tools such as semi-automatic and automatic pencil sharpener are introduced into the current market. In general, semi-automatic pencil sharpener requires manual rolling forces to sharpen the pencil into preconfigured type by a rotary blade. Additionally, please also refer to the embodiment ofFIG. 1,FIG. 2, andFIG. 3. The automatic pencil sharpener primarily comprises a rotary blade a1powered by an automatic motor. The rotary blade a1forms an angle with the axis of the pencil receiving opening a2. A switch component a3is located in the inner side of the pencil receiving opening a2, The switch component a3is designed to push the trigger a4. The trigger a4covers a half of the pencil receiving opening a2. When in use, the pencil inserted into the pencil receiving opening a2will push the trigger a4which then releases the switch component a3to start the motor, and drive the rotary blade a1to sharpen the pencil b into an appropriate conical shape in a preconfigured angle. However, since the pencil receiving opening a2is fixed, pencils with different sizes may not be inserted into the pencil receiving opening a2, and the sharpener will shake when the pencil of a smaller size is inserted into the pencil receiving opening a2. In order to solve this problem, a pencil selector panel a5having a plurality of openings with different sizes was proposed so that the user can select an opening with a proper size by rotating the selector panel a5. However, in the conventional pencil sharpener, since the pencil is inserted into the opening to be in contact with and to push the trigger a4, the increased pressure on the pencil may make it difficult to insert the pencil into and remove the pencil from the opening.

SUMMARY OF THE INVENTION

It is therefore a primary object of the present invention to provide a device of an improvement on an automatic pencil sharpener.

It is a further object of the present invention to provide a device which can adjust the location of a trigger switch by the movement of pencil selector panel to make pencil insertion and more smoothly.

Thereafter, the automatic pencil sharpener primarily comprises a pencil sharpener body and pencil selector panel, and characterized by a plurality of different sizes of pencil selecting openings set up in front of the pencil selector panel which has an annulus groove at the rear side of the pencil sharpener body. The pencil selector panel is mounted on an emplacing groove located at the front side of the pencil sharpener body. A pencil receiving opening and a plurality of pawls are located in the emplacing groove. A trigger switch is arranged close to the pencil receiving opening and is within of a position groove. Above the trigger switch, a trigger key and a trigger corresponding to the size of annulus groove are fixed.

Accordingly, when assembling the pencil sharpener, the pencil selector panel is fixed to the emplacing groove, and the trigger of the trigger switch is inserted into the annulus groove of the pencil selector panel. Therefore, when rotating the pencil selector panel, the trigger will move along with the inner circumference of the annulus groove, and drive the trigger switch to move linearly along with position groove such that the location of the trigger key will be changed according to the selected pencil openings. Therefore, the pencil can be inserted into and removed from the openings more smoothly.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

FIGS. 4-6show an automatic pencil sharpener in accordance with the present invention primarily comprises a pencil sharpener body1, and a pencil selector panel10.

A plurality of pencil selecting openings11are set up in front of the pencil selector panel10which has annulus groove12at the rear side of the pencil selector panel10. The pencil selector panel10is mounted on the emplacing groove1aat the front side of the pencil sharpener body1. A pencil receiving opening1band a plurality of pawls1care located in the emplacing groove. A trigger switch20is arranged close to the pencil receiving opening1band is within a position groove21. Above the trigger switch20, a trigger key23and a trigger22corresponding to the size of annulus groove12are fixed.

As shown inFIGS. 6-8, when rotating the pencil selector panel10, the trigger22will move along with the inner circumference of the annulus groove12, and drive the trigger switch20to move linearly along with position groove21. Since the inner circumference of the annulus groove12have different curvatures and there are the predefined distances among the corresponding pencil openings11, the location of the trigger key23will move to the selected pencil opening11when the pencil selector panel10rotates.

In summary, the Automatic Pencil Sharpener utilizes the movement of the pencil selector panel to drive the trigger to move in the annulus groove and drive trigger switch to move linearly. Therefore, the pencil insertion and removal will be easier.