JPS6150798B2 - - 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. a lead core holding member having a protrusion that engages with the lead core holding member, and the lead core holding member is advanced by relative rotation between the spiral groove and the longitudinal groove;
A so-called rotary-feeding sharp pencil that feeds out lead cores is well-known, but in the former case, the lead cores stored in the lead storage tube can be fed out sequentially until the last one, but on the other hand, the lead that is fed out is The length of the lead is fixed to a certain extent, and it is not possible to arbitrarily select the desired length.In the latter case, the desired lead feed amount can be arbitrarily selected, but on the other hand, each lead core is Since the lead core is held by a holding member, when one lead core is consumed, a new lead core must be replaced with the lead core holding member, and each lead 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 made by meshing with a tooth ring, so that the rotation of the cylinder with respect to the outer cylinder rotates the conical rod, so that the pencil lead stored in the inner cylinder can be sequentially sent forward and returned to the rear. It's getting old.

However, with the above-mentioned sharpening pencil,
Since the three conical rods have spiral protrusions in the same direction and rotate in the same direction, the lead cores will only rotate in the same position unless you take into account the prevention of rotation of the lead cores. There was a fear that it would never move forward or retreat.

(Object of the Invention) The present invention has been made in view of the above-mentioned problems, and it is an object of the present invention to provide a sharpening pencil that can smoothly move the lead core back and forth by preventing rotation of the lead core as much as possible. It is.

(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 comprising a plurality of lead-core feed rollers rotatably mounted at positions eccentric to the shaft center in the front part of the barrel, at least one of the lead-core feed rollers is connected to the other lead-core feed rollers. The object of the present invention is to provide a sharpening pencil which has spiral protrusions in opposite directions and is capable of rotating in opposite directions, and which satisfies the above-mentioned purpose.

(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,
Lead core feed rollers 3, 1 are provided at the front inside of the shaft cylinder 1 with spiral protrusions 2, 102 in mutually opposite directions.
03 is a hole 5 provided in a position where the shafts 4a, 4b and 104a, 104b connected to each roller 3, 103 are eccentric to the axis in the shaft cylinder 1,
105 and bearings 6 and 106 so as to be rotatably inserted, and are arranged at positions facing each other with a lead core L interposed therebetween.

A tubular member 7 is disposed in front of the shaft tube 1, the front end of which is fixed, the tubular member 7 has an inner diameter slightly larger than the outer diameter of the lead core L and supports the lead core L. Some windows 8, 108 are provided on opposing side walls of the tubular member 7 so that a portion of the outer periphery of each of the lead core feed rollers 3, 103 can press the lead core L inside the tubular member 7. It is being A shaft 4a connected to the lead core feed roller 3, 103,
Elastic bodies 9 and 10 that press the lead core feed rollers 3 and 103 in the direction of the lead core L are provided at 104a.
9 is in contact with one end of the elastic body 9,109.
The other end is fixed to the inner surface of the shaft cylinder 1 or to the bearing 3. A gear 10 is fixed to the end of one of the shafts 4a, and a gear 12 is fixed to the front outer surface of the lead core storage cylinder 11 which is rotatably attached to the shaft cylinder 1. A gear 110 is fixed to the end of the other shaft 104a, and a gear 112 fixed to the front inner surface of the lead core storage cylinder 11 is engaged with the gear 110. .
As a result, each of the lead core feeding rollers 3 and 103 can rotate in opposite directions as the lead core storage tube 11 rotates. The rear end portion of the tubular member 7 is inserted into the front end opening of the lead core storage tube 11 so that the lead core storage tube 11 can rotate,
In order to prevent the lead core storage tube 11 from shifting, it is preferable to provide a protruding stopper 13 as shown in the figure. Reference numeral 14 denotes a rear barrel, which is rotatable through a joint 15 with the barrel 1. On the other hand, the rear barrel 14 is engaged with an engaging portion 16 formed at the rear of the lead storage tube 11. A mating hole 17 is formed, and the rear shaft cylinder 14 and the lead core housing cylinder 11 can be rotated together by the engaging portion 16 and the hole 17.

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

When the shaft cylinder 1 and the rear shaft cylinder 14 are relatively rotated with the shaft cylinder 1 facing downward, the rear shaft cylinder 14
Since the lead core housing tube 11 and the lead core housing tube 11 are engaged with each other, the lead core housing tube 11 also rotates relative to the shaft tube 1. When the lead core storage tube 11 rotates, the gear 12 attached to the lead core storage tube 11 engages with the gear 10 of the lead core feed roller 3, and the gear 112 engages with the gear 110 of the lead core feed roller 103. , the lead core feed rollers 3 and 103 also rotate in opposite directions. Now fix the shaft cylinder 1 and rear shaft cylinder 1.
4 is rotated in the direction of the arrow A in FIG.
rotates in the direction opposite to the direction of the arrow A, that is, in the direction of the arrow B shown in FIG. 1, while the lead core feed roller 103 rotates in the same direction as the direction of the arrow A.
Lead core feed roller 3 given such rotation
The spiral protrusion 2 is a left-handed screw, and the lead core feed roller 10
If the spiral protrusion 102 of No. 3 is a right-handed thread, the spirals rotate in opposite directions but are moved toward the front of the shaft cylinder 1, that is, toward the left side. On the other hand, the lead core L, which has fallen from the lead core storage cylinder 11 through the tubular member 77 to the window portions 8, 108 of the tubular member 7 due to its own weight, reaches the end of the lead core feed rollers 3, 103. Since the lead core feed rollers 3, 103 rotate as described above and the spiral protrusions 2, 102 move in the falling direction of the lead core L, the lead core feed rollers 3, 10
The lead core L is pulled in and gripped while slightly expanding outward against the pressing force of the elastic bodies 9, 109 pressing on the lead core L. If the lead core feed rollers 3, 103 are rotated even after the lead core L is gripped, the lead core feed rollers 3, 103 have spiral protrusions 2, 102 in opposite directions, and Because it rotates,
The lead core L is sent out toward the front of the shaft cylinder 1 without rotating. When returning the lead core L, it is sufficient to give the lead core feed rollers 3, 103 a rotation opposite to that described above.

(Effects of the Invention) According to the present invention as described above, not only can a desired length of lead core be protruded, but also the spare lead core stored in the lead core storage tube can be sequentially moved. A sharp pencil that can be fed out, combines the advantages of conventional nozzle type sharp pencils and rotary feed type sharp pencils, and also prevents the lead core from rotating and allows the lead core to move smoothly back and forth. can be provided.

Note that the number of lead core feed rollers mentioned above is not limited to two as in the embodiment, but may be increased in number, and in this case, at least one lead core feed roller should be able to rotate in the opposite direction to the other rollers. . In order to smoothly grip the lead core with the lead core feed roller, the diameter of the end of the lead core feed roller on the lead core storage cylinder side is gradually reduced, and the lead core storage cylinder is integrated with the rear shaft cylinder. may be modified in various 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 feed roller, 10,110,1
2,112...gear, 11...lead core storage cylinder.

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 sharp pencil in which a plurality of lead core feed rollers are rotatably mounted at positions eccentric to the shaft center in the front part of the shaft cylinder, at least one of the lead lead feed rollers has a helical protrusion in the opposite direction to the other lead lead feed rollers. What is claimed is: 1. A sharpening pencil having the following features: