JPS602956Y2 - core sharpener - Google Patents

Description

[Detailed description of the invention] The present invention relates to a pencil lead sharpener having an elliptical shape.
More specifically, a horizontal round hole for the inner fitting is drilled in the center, and a wavy step with a certain period is drilled on the ring groove in which the boss of the inner fitting can be inserted and rotated on the inner peripheral wall surface of the round hole. ,
and a core body formed by attaching a sub-blade to the tip opening of the round hole and drilling a vertical hole for removing cuttings below the sub-blade attachment part;
An inner member having an oval hole bored therein into which an oval pencil can be inserted, a boss on the outer circumferential surface that can be inserted into a ring groove of the round hole, and further rotatably inserted into the round hole. This relates to a core sharpener made of a combination of the following.

To specifically explain one embodiment of the core sharpener according to the present invention with reference to the drawings, in FIGS. Hole 2 is drilled.

Further, a ring groove 3 into which a boss of a later-described inner tool can be inserted is bored in the rear inner circumferential wall of the round hole 2, and a sub-cutter 4 is attached at a certain angle to the opening at the tip of the round hole 2. ing.

Further, a vertical hole 5 for taking out cutting chips is bored in the lower part of the attachment part of the sub-blade 4.

On the other hand, at the tip of the inner circumferential wall of the horizontal round hole 2, a step a formed at a certain wavy period is particularly formed as shown in FIG. It is constructed so that it can swing.

Next, reference numeral 6 denotes a middle part that can be rotatably inserted into the round hole 2, and has an oval hole 7 bored in its center and a groove 3 of the main body 1 on its outer peripheral surface. A boss 8 that can be inserted into is bored.

Further, numeral 9 in the figure is a pencil inserted into the inner tool 6.

In the above embodiment, the pencil 9 inserted into the inner tool 6 hits the step a of the round hole 2 and swings back and forth along the step a as it rotates. By drilling the ring groove 10 in the inner circumferential wall surface of the round hole 2 shown in FIG.
It is also possible to swing and cut the pencil attached to the inner tool 6 by sliding the inner tool 6 itself and swinging it back and forth.

Since the lead sharpener according to the present invention has the above-described structure, when the oval pencil 9 is inserted into the inner tool 6 and rotated, the pencil itself will move along the step a or the inner tool 6 will move along the ring groove 3. Accordingly, the pencil 9 swings back and forth by a certain length, and when the short axis of the pencil 9 is cut with the cutting blade 4, the pencil 9 moves forward, and when the long axis of the pencil 9 is cut with the cutting blade 4, the pencil 9 moves backward. , the core inside the pencil 9 is always brought into contact with the cutting blade 4 at a fixed position, and the axis around the core can be cut uniformly regardless of the ellipse.

[Brief explanation of the drawing]

Figures 1, 3, and 4 are cross-sectional explanatory views, Figure 2 is a developed plan view explaining the period of the step, Figures 5 and 6 are rear views, and Figures 7 and 8 are other views. It is an explanatory view of the side. 1...Core main body, 2...Round hole, 3...
...Ring groove, 4...Stinging blade, 6...
-Inner tool, 7...Oval hole, 8...Boss, 9...Pencil.

Claims (1)

[Scope of utility model registration request] A horizontal round hole for the inner fitting is drilled in the center, and a ring groove in which the boss of the inner fitting can be inserted and rotated and a wave-shaped step having a constant period are bored in the inner peripheral wall of the round hole, and A core main body is formed by attaching a sub-blade to the opening at the tip of the round hole and drilling a vertical hole for taking out shavings below the sub-blade attachment part, and an oval hole into which an oval pencil can be inserted. A core sharpener having a boss on the outer circumferential surface that can be inserted into the ring groove of the round hole, and a center tool that can be rotatably inserted into the round hole.