JPS5821758Y2 - Lead diameter adjustment device for pencil sharpeners - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a lead diameter adjusting device for a pencil sharpener.

In a conventional pencil sharpener, a lead stopper shaft is movably inserted from the rear of the rotating shaft, and the lead stopper shaft is supported so as to be able to approach and separate from a pencil insertion taper hole of the rotating shaft,
There is one in which the core diameter can be adjusted and cut by adjusting the position of this core stopper shaft.

However, such a lead stopper shaft must have a notch at its tip to escape from the cutter and external gear, and especially when the lead stopper shaft is made of synthetic resin, if a strain is applied to the tip, the notch will It has drawbacks such as being easily damaged and having poor strength.

In another conventional example, the front part of a lead stopper is fitted into the guide part of the rotating shaft so as to be movable back and forth, and the base hook part of this lead stopper is engaged with the groove at the tip of the adjusting shaft. There is one in which the lead stopper is moved opposite the tapered pencil insertion hole as the pencil moves forward and backward.

In this case, the adjustment shaft is provided with its axis parallel to the axis of the rotating shaft, and the lead stopper is provided between the cylindrical cutter and the cylindrical cutter in order to prevent the pencil lead from digging in between the lead stopper and the cylindrical cutter. It is necessary to move it along.

Therefore, in order to fit the front side part of the lead stopper into the guide part of the rotating shaft and engage the base hook part of the lead stopper with the groove of the adjustment shaft as described above, there is a gap between the lead stopper and the guide part of the rotating shaft. It cannot be assembled unless it has a backlash.

When the lead stopper and the guide part of the rotating shaft are provided with backlash in this way, the middle part of the lead stopper is placed in the plate to prevent the base hook part from coming off from the groove of the adjustment shaft when the lead stopper is moved. It must be pressed by a spring.

However, when the middle part of the lead stopper is pressed by the leaf spring in this way, a moment acts on the lead stopper to rotate its front part towards the rotation axis and its base towards the adjustment axis, ensuring that the lead stopper is firmly attached to the cylindrical cutter. This makes it difficult to move the pencil lead along the lead stopper and the cylindrical cutter.

Further, there is a drawback that the structure related to the core stopper, the guide portion of the rotation shaft, and the adjustment shaft becomes complicated.

The purpose of this invention is to provide a pencil sharpener that has excellent strength, can prevent damage, prevents the lead from digging into the pencil, and has a simple structure for adjusting the lead diameter. We are in the process of providing equipment.

In order to achieve such an object, the present invention provides a pencil sharpener in which a cylindrical cutter rotates and revolves around a pencil inserted into a pencil insertion taper hole of a rotary shaft to cut a pencil. a guide portion formed on a shaft parallel to the axis of the cylindrical cutter; a lead stopper supported on the guide portion so as to be slidable along the cylindrical cutter, and facing the pencil insertion taper hole; It is supported so as to be movable in the axial direction on the opposite side of the pencil insertion taper hole on the rotating shaft, and the distal end surface comes into contact with the lead stopper and serves as a means for adjusting the position of the lead stopper, and as the adjustment shaft moves forward, The lead stopper is pushed forward by its tip end surface, and the lead stopper is moved back by the pencil lead when the adjustment shaft is moved back.

Embodiments of the present invention will be specifically described below with reference to the drawings.

In FIGS. 1 and 2, 1 is a bearing that is removably attached to a case (not shown) and has an internal gear 2 at its inner end;
4 is a rotating shaft rotatably supported at one end by a bearing 1; 4 is a tapered pencil insertion hole 5 and 6 formed in the rotating shaft 3; supporting members are respectively connected to the rotating shaft 3; 7 is supporting both ends; member 5,
A cutter pin fixed to 6, a cylindrical cutter 8 rotatably supported on the cutter pin 7, and a cylindrical cutter 9 fixed to one end of the cutter 8 to connect the cutter pin 7 with the cutter 8.
The external gear 10 is rotatably supported above and meshed with the internal gear 2, and 10 is a handle screwed onto the rear end of the rotating shaft 3.

By rotating the handle 10, the rotating shaft 3 is rotated and the cutter 8 is revolved, and accordingly, the cutter 8 is rotated due to the engagement between the external gear 9 and the internal gear 2, and the tapered pencil insertion hole is rotated. A pencil (not shown) inserted in 4 can be cut.

A guide portion 11 is provided on the cutter 8 side at the middle portion of the rotating shaft 3.
is provided protrudingly, and this guide portion 11 is inclined parallel to the axis of the cutter 8.

The guide portion 11 is formed with a U-shaped cross section on both sides, and a substrate 13 connected to the core stopper 12 is slidably fitted therein, and the cutter 8 side of the core stopper 12 is formed in an arc shape along the outer shape of the cutter 8. It is indented in.

Therefore, the lead stopper 12 can be moved opposite the tapered pencil insertion hole 4.

An adjustment shaft 15 is movably supported in a hole 14 formed in the axial direction at the rear of the rotating shaft '3, that is, on the opposite side from the pencil insertion tapered hole 4.

A notch 16 for escape from the cutter 8 and external gear 9 is formed at the tip of the adjustment shaft 15, and the tip surface faces the rear side of the core stopper 12.

As an example of a means for moving the adjustment shaft 15 and adjusting its position, a compression spring 18 is interposed between the front end wall of the hole 14 and a spring receiver 18 provided at an intermediate portion of the adjustment shaft 15. The shaft 15 is always energized backwards, and the handle 1
A known knocking mechanism 20 is supported on the inside of the upper part of 0 in association with the adjustment shaft 15.

By operating this knock mechanism 20, the adjustment shaft 15 can be advanced in multiple steps against the elasticity of the compression spring 18, or can be moved backward by the elasticity of the compression spring 18.

The core diameter adjusting device of the present invention has a knock mechanism 2 as described above.
0 to advance the adjustment shaft 15 step by step, and in conjunction with this, the lead stopper 12 approaches the pencil insertion taper hole 4 side, thereby bringing the pencil lead into contact with the lead stopper 12 and advancing the pencil. Therefore, the core can be cut with a large diameter.

Further, when the knock mechanism 20 is operated to move the adjustment shaft 15 backward, the lead stopper 12 is initially located close to the pencil insertion taper hole 4 side, but as the pencil is being cut, the lead stopper 12 is moved back to the adjustment shaft 15. The core can then be cut to a smaller diameter.

FIG. 3 shows another embodiment of the present invention.

In this embodiment, as a means for moving the adjustment shaft 15 and adjusting its position, the rear part of the rotary shaft 3 and the adjustment shaft 15 are screwed together, and the other configurations are the same as in the previous embodiment. It is.

Incidentally, the lead stopper 12 and the rotating shaft 3 may be slidably fitted together by a protrusion and groove having a dovetail shape in cross section.In other words, as the rotating shaft 3 rotates, the lead stopper 12 moves into the cutter 8.
Just support it so it doesn't move to the side.

At this time, if the lead stopper 12 is detachably supported on the rotating shaft 3, even if a hole is formed in the lead stopper, only the lead stopper needs to be replaced, which is economically advantageous.

As is clear from the above, according to the present invention, the lead stopper that contacts the pencil lead and regulates the advancement of the pencil, and the adjustment shaft that adjusts the position of this lead stopper are formed separately. Even if the tip of the adjustment shaft is made thin so as to escape from the cutter and the external gear, the lead stopper can be received by the front end surface of the adjustment shaft, and there is no risk of damage due to strain force.

In addition, since the tip end surface of the adjustment shaft is brought into contact with the core stopper, the core stopper can be slidably supported against the guide portion of the rotating shaft without any backlash. The pencil lead can be moved reliably along the cylindrical cutter, and the pencil lead can be prevented from getting stuck between the lead stopper and the cylindrical cutter.

Furthermore, since the tip end surface of the adjustment shaft is brought into contact with the core stopper, it is only necessary to provide precision to the guide portion of the rotary shaft and the core stopper, which has the advantage of simplifying the structure.

[Brief explanation of drawings]

Fig. 1 is a cutaway side view of essential parts showing an example of a pencil sharpener incorporating the lead diameter adjusting device of the present invention, and Fig. 2 is a section II-- of Fig. 1.
FIG. 3 is a cutaway end view taken along line II, and FIG. 3 is a partially cutaway side view of a main part showing a pencil sharpener implementing another example of the lead diameter adjusting device of the present invention. 1...Bearing, 2...Internal gear, 3...
...rotation shaft, 4...pencil insertion taper hole,
8...Cutter, 9...External gear, 1
0...Handle, 11...Guide, 1
2... Core stopper, 15... Adjustment shaft, 20... Knock mechanism.

Claims (1)

[Scope of utility model registration request] A rotating shaft having a tapered pencil insertion hole is supported by a bearing,
A cylindrical cutter and an external gear fixed to the cutter are supported by a cutter pin on a support member of a rotating shaft, and the external gear is meshed with an internal gear formed on the bearing to move the cutter into the pencil insertion taper. A pencil sharpener that cuts a pencil by rotating and revolving around the pencil inserted into one hole, the guide portion being formed on a rotating shaft parallel to the axis of the cylindrical cutter; a lead stopper that is slidably supported along the cylindrical cutter and opposite the pencil insertion taper hole; and a lead stopper that is supported movably in the axial direction on the opposite side of the pencil insertion taper hole on the rotating shaft. 1. A lead diameter adjusting device for a pencil sharpener, comprising: an adjusting shaft whose tip end surface contacts a lead stopper to adjust the position of the lead stopper; and means for adjusting the position of the adjusting shaft.