JPS641318B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a sharpening pencil that feeds out lead as much as it is consumed.More specifically, by rotating a part of the main body,
This relates to a sharpening pencil in which a lead core housed within the body is sequentially fed out to the tip of the body.

(Prior art and its problems) Conventionally, a sharp pencil that feeds out lead as much as it is consumed uses a collect chuck, and the rear end of the lead storage cylinder connected to the collect chuck is connected to the rear end of the sharp pencil. The so-called knock-type sharp pencil has a spiral groove, a vertical groove, and a spiral groove, a vertical groove, etc. The lead core holding member has a protrusion that engages with the spiral groove, etc., and the lead core holding member is advanced by the relative rotation between the spiral groove and the longitudinal groove, and the lead core is fed out. Feeding type sharp pencils are well known, but in the former, the lead cores stored in the lead storage tube can be fed out one by one up to the last one, but on the other hand, the length of the lead tips to be fed out is fixed to a certain extent, It is not possible to arbitrarily select the desired length, and while in the latter case the desired amount of lead core feeding can be arbitrarily selected, on the other hand, each lead core is held in a lead core holding member.
When one lead core is consumed, a new lead core must be attached to the lead core holding member, and each has its advantages and disadvantages.

In view of the above-mentioned circumstances, a sharpening pencil as disclosed in Japanese Patent No. 68284 has been proposed in an attempt to overcome the drawbacks of both. The sharp pencil is provided with a rotatable inner cylinder inside the outer cylinder, into which a cap piece is fitted at the tail end and a fitting ring having a through hole for a pencil lead at the other end is fixed, and in front of the inner cylinder, A conical rod having a spiral protrusion around its periphery is rotatably provided within the conical end of the outer cylinder, and teeth provided on the inner wall of the recess in the front wall of the inner cylinder and a small portion provided at the tail end of the conical rod. It is formed by meshing with a tooth ring, whereby the rotation of the inner cylinder with respect to the outer cylinder rotates the conical rod and sequentially sends out the pencil leads stored in the inner cylinder forward, and
It is now possible to move it back.

However, with the above-mentioned sharpening pencil, 3
Although several conical rods are used, since the lead core does not have a guide part that reliably guides the lead core into the conical rod, the lead core may break when pushed between the spiral protrusions of the conical rod. This may cause problems such as.

(Object of the Invention) The present invention has been made in view of the above-mentioned problems, and has an object to reliably feed lead cores into a lead core feeding roller and sequentially feed out spare lead cores stored in a lead core storage cylinder. The aim is to provide a sharpening pencil that can

(Summary of the Invention) The present invention includes a lead core storage cylinder that is rotatably arranged in a shaft cylinder, which is equipped with a gear on the front part, a gear that engages with the gear of the lead core storage cylinder, and a spiral protrusion on the outer periphery. In a sharp pencil, a plurality of lead-core feed rollers having a diameter of 100 mm are rotatably mounted at positions equidistant from the axis in the front part of the shaft cylinder, and the rear end of the lead-core feed roller has a spiral shape that gradually becomes smaller in diameter. The object of the present invention is to provide a sharpening pencil characterized by having a substantially conical small diameter portion having a protrusion, and to meet the above object.

(Examples) Hereinafter, the present invention will be described in detail based on examples shown in the accompanying drawings.

In FIG. 1, reference numeral 1 is a shaft cylinder,
At the inner front part of the shaft cylinder 1, there are spiral protrusions 2 in the same direction.
102 and a lead core feed roller 3, 103 provided with a small diameter portion 3a, 103a that gradually becomes smaller in diameter at the rear end.
Shafts 4a, 4b and 104a, 10 connected to
4b are rotatably fitted into holes 5, 105 and bearings 6, 106 provided at positions eccentric to the axis in the shaft cylinder 1, and are arranged at positions facing each other with the lead core L interposed therebetween. 7 is the lead core feeding roller 3,103
It is a tubular member placed in front of the shaft cylinder 1. The shafts 4a, 104a connected to the lead core feed rollers 3, 103 have the lead core feed rollers 3,
One end of an elastic body 8, 108 that presses the lead core 103 in the direction of the lead core L is in contact with the other end of the elastic body 8, 108, and the other end of the elastic body 8, 108 is attached to the inner surface of the shaft cylinder 1 or the bearing 3.
is fixed to. Also, gears 9, 109 are fixed to the ends of the shafts 4a, 104a.
109, a gear 1 fixed to the front outer surface of the lead core storage cylinder 10 rotatably attached to the shaft cylinder 1;
1 are engaged with each other, so that the respective lead core feeding rollers 3 and 103 can rotate in the same direction as the lead core storage cylinder 10 rotates.

Next, the operation of the above embodiment will be explained.

When the shaft tube 1 and the lead core storage tube 10 are rotated relative to each other with the shaft tube 1 facing downward, the gear 11 attached to the lead core storage tube 10 and the gear of the lead core feed roller 3, 103 are rotated. 9 and 109 are engaged with each other, the lead core feeding rollers 3 and 103 rotate in the opposite direction to the lead core storage cylinder 10. Now, suppose that the shaft tube 1 is fixed and the lead core storage tube 10 is rotated in the direction of the arrow A in FIG. Rotation is performed in the direction of arrow B shown in FIG. Lead core feed rollers 3, 10 given such rotation
If the spiral protrusion 2, 102 of No. 3 is a left-handed thread, the spiral is moved toward the front of the shaft cylinder 1, that is, toward the left side in the figure. On the other hand, the lead core L that has fallen from the lead core storage cylinder 10 due to its own weight is transferred to the lead core feeding rollers 3 and 10.
Since the lead core L enters the gap formed between the small diameter portions 3a and 103a of the lead core L, if the lead core feed roller 3, 103 rotates as described above, the lead core L is immediately transferred to the lead core feed roller 3, 103. It is drawn in and grasped. Lead core L is lead core feed roller 3, 10
3, when the lead core feed roller 3,
103 expands slightly outward against the pressing force of the elastic bodies 9 and 109. Lead core feed roller 3,1
If 03 is rotated even after the lead core L is gripped,
The lead core L is sent out toward the front of the shaft cylinder 1 as the spiral protrusions 2 and 102 move. When returning the lead core L, it is sufficient to give the lead core feed roller a rotation opposite to that described above.

(Effects of the Invention) According to the present invention as described above, it is possible not only to make a lead core of any desired length protrude, but also to reliably feed the lead core into the lead core feeding roller. To provide an excellent sharpening pencil which can sequentially send out spare lead cores stored in a lead core storage cylinder and has the respective advantages of a conventional lock type sharpener pencil and a rotary feed type sharpener pencil.

Note that the number of lead core feed rollers mentioned above is not limited to the embodiment and may be increased, and in order to prevent rotation of the lead core when moving the lead core, at least one lead core feed roller is provided with a roller that is opposite to the other rollers. It is also possible to provide a spiral protrusion in the same direction and rotate in the opposite direction, and the present invention can be modified in various other ways without departing from the gist thereof.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a longitudinal sectional view. 1... Shaft cylinder, 2, 102... Spiral protrusion, 3,
103...Lead core feeding roller, 3a, 103a...
...Small diameter part, 9,109,11...Gear, 10...
Lead core storage tube.

Claims (1)

[Claims] 1. A lead core storage cylinder equipped with a gear on the front part is rotatably arranged in a shaft cylinder, and a lead core feeding roller is provided with a gear that engages with the gear of the lead core storage cylinder and has a helical protrusion on the outer periphery. In a sharpening pencil in which a plurality of sharpening pencils are rotatably mounted at positions equidistant from the axis in the front part of the shaft cylinder, a substantially conical small diameter part having a spiral protrusion that gradually becomes smaller in diameter at the rear end of the lead feed roller. A sharpening pencil characterized by being provided with.