JPH11188990A - Mechanical pencil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate stain or the like of fingers or a sheet surface to be written due to lead dust by using a refill of a general mechanical pencil without necessity of a special lead. SOLUTION: In the mechanical pencil, a rotary roller 9 having a feed droller 8 is disposed in the state exposed from a barrel 1 to feed a lead, the exposed roller 9 is disposed at an offset position from an axis of the barrel 1 or a rotary roller 9 having a feed roller part 8 for feeding the lead is disposed in the state that the roller 9 is exposed from the barrel 1, the exposed roller 9 is disposed coaxially with the axis of the barrel 1, and a retraction restriction means for preventing a retraction of the lead by a wedge operation is disposed near the roller 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sharpening pencil for feeding a lead by rotating a roller.

[0002]

2. Description of the Related Art Conventionally, as a sharp pencil for feeding out a core by rotating a roller,
There is Japanese Utility Model Publication No. 37-32317. The utility model registration claim of the publication states that “the rack 4 formed on the upper surface of the shaft cylinder 1 and penetrating through the concave shaft 2 in the axial direction is formed on the upper surface of the pencil core 3 inserted into the shaft cylinder 1. An annular stopper for fitting and rotatably mounting a gear 5 whose tooth tip meshes with the rack 4 of the pencil core 3 in the barrel 1 on the top surface of the tip of the barrel 1 so as to prevent the gear 5 from rotating. 6 is slidably fitted in the shaft cylinder 1 in the axial direction. "

[0003]

However, in the above-mentioned prior art, a special pencil core, that is, a pencil core formed with a rack must be used, which is inconvenient. Was. Also, since the gear to be operated and the pencil core are meshed with each other, the core is shaved by the teeth of the gear, and as a result, the heart powder of the pencil core attached to the gear adheres to the operated finger and the like. However, not only the finger, but also the surface of the paper to be written on, etc., would be soiled.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and is arranged with a rotating roller having a feeding roller portion for feeding a core exposed from a shaft cylinder. And the exposed rotating roller
Is arranged at a position offset from the axis of the barrel,
Alternatively, a rotating roller having a feeding roller portion for feeding the core is disposed in a state of being exposed from the barrel, and the exposed rotating roller is coaxial with the axis of the barrel. Further, the gist of the present invention is that a retraction restricting means for preventing the retraction of the core by a wedge action is disposed near the rotary roller.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The rear part of a shaft cylinder 1 is a lead tank part 2 for directly storing a lead. In front of the wick tank 2, a wick 1
An operation unit 4 in which a core insertion hole 3 through which the main body can be inserted is formed.
Are detachably fixed by screwing or the like. A space 5 is formed in front of the core insertion hole 3 of the operation unit 4, and the space 5 surrounds and holds about half of the core sent out from the core insertion hole 3. Core holding member 6
Has been fixed. Reference numeral 7 denotes a semicircular groove surrounding and holding the core. An operation roller 9 having a feed-out roller portion 8 for feeding out a lead is rotatably supported on the lead holding member 6. Symbol 10 is
The rotating shaft is formed on the operation roller 9, and the rotating shaft 10 is supported by a shaft hole 11 formed on the lead holding member 6.

The operating roller 9 has a larger diameter than the feeding roller 8 and is slightly exposed from a window hole 12 formed on the side surface of the barrel 1. It was exposed so that it could be easily operated with a finger or the like. Further, the operation roller 9 is arranged at a position offset from the center axis of the barrel 1. This is also in consideration of operability, because the index finger to be operated is located at a position slightly offset from the center axis of the barrel 1 when the barrel 1 is gripped by hand. In addition, the feeding roll
La-8 has elasticity that the core bites slightly,
The core is held between the concave portion 7 of the core holding member 6.

Next, the materials of the feeding roller 8 and the operation roller 9 will be described. When the above rollers are integrally formed, ABS , POM, elastomer
- and the like, depending on their hardness whether, feeding property, considering the operability, or by fitting the gum on the surface of each roller may be such as such as a coating of elastic powder spray. Alternatively, the feeding roller 8 and the operation roller 9 may be formed as separate members and fixed by means such as fitting or bonding. As the material at that time, a material that makes use of the characteristics of each of the feeding roller 8 and the operation roller 9 can be appropriately selected. Incidentally, as the material of the feeding roller 8 at that time, silicone rubber , NBR, or elastomer having good durability against the core is preferable, and the material of the operating roller 9 is resistant to sweat, hand oil, and the like. ABS, POM, and AS are preferred.

[0008] A tip member 13 is provided at the tip of the lead holding member 6.
Is detachably fixed by means such as screwing,
A so-called ball chuck mechanism 14 that prevents the lead from retracting by a wedge action is disposed inside the tip member 13. Here, the ball chuck mechanism 14 will be described. A chuck body 16 for gripping and releasing the core is provided inside a case 15 with a resilient member 17 such as a coil spring.
It is movably arranged while being urged rearward. A chuck ring 19 having an inclined surface 18 is fixed to the front inner surface of the case 15, and the inclined surface 18 and a concave portion 20 formed in the chuck body 16 are fixed.
The rolling element 21 is disposed between the two. The closing action acts on the chuck body 16 by the urging of the repelling member 17 rearward, thereby gripping the lead and preventing the lead from retracting.

A release button 22 for releasing the wedge action of the ball chuck mechanism 14 is provided between the core holding member 6 and the ball chuck mechanism 14, and a part of the release button 22 is moved from the surface of the barrel 1. It is arranged in an exposed state. A gap 23 is formed between the release button 22 and the rear end of the chuck body 16 with which the release button abuts, in order to prevent the wedge action from being released in an accidental operation. In order to increase the certainty, the release button 22 may be urged rearward by a resilient member or the like. Reference numeral 24 denotes a core protection tube fixed to the tip of the tip member 13, but may be formed integrally with the tip member.

Next, the operation will be described. When the operation roller 9 is rotated with the index finger or the like from the state shown in FIG. 1 (the state in which the front ends of the core protection tube 24 and the core L are flush), the feeding roller 8 also rotates and the core L moves forward. Let me know. At this time, the chuck body 16 of the ball chuck mechanism 14 slightly advances due to the advance of the lead L, the wedge action is released, and the lead L
Of the chuck body 16 is released, and the lead L can be easily advanced. In this way, the lead L is extended. Here, when the rotation operation of the operation roller 9 is stopped, the chuck body 17 is urged rearward by the resilient member 17, the wedge action is restored, and the retraction of the lead L is prevented.
To retract (immerse) the lead L, the release button 22 is advanced while the lead L is in contact with the writing surface. Then, the chuck body 16 also advances, and the wedge action is released. At this moment, the core L sinks into the core protection tube 24 while retreating.

A second example will be described with reference to FIGS. This is a modified example of the shape of the feeding roller 8. The feeding roller 25 in this example has a triangular shape, and its bottom surface 26 is in contact with the core L slightly biting. Of course, the feeding roller 25 has elasticity, and the top 27 is deformed when the lead L is advanced (see FIG. 5). In the present embodiment, the ball chuck mechanism 14 for preventing the lead L from retreating and the release button 22 are arranged as in the previous example, but the bottom L of the feed roller 25 and the lead holding member 6 are used for the lead L. Is held, and the triangular feeding roller 25 is not reversely rotated by normal writing pressure, and is not always necessary. In order to retract the lead L, if a force stronger than a normal writing pressure is applied, the feeding roller 25 reversely rotates and retracts (enters).
Needless to say, if the gripping force of the core L acting on the bottom surface 26 of the feeding roller 25 and the core holding member 6 is weakened, the ball chuck mechanism 14 is required. still,
In this embodiment, the shape of the feeding roller is triangular, but various polygonal shapes such as a quadrangle and a pentagon can be appropriately selected.

A third example will be described with reference to FIG. The feeding roller 28 is formed in a gear shape, the projection 30 is formed radially on the side surface of the operation roller 29, and the resiliently deformable claw 31 is engaged with the projection 30 inside the operation unit 4. This is an example in which is provided. By rotating the operation roller 29, the projections 30 and the claws 31 are engaged, and the sound generated at that time provides an operational feeling. Further, as compared with the second example, there are more contact portions (teeth 32) with the core,
The feedability of the core is improved. In this embodiment, as in the previous embodiment, a ball chuck mechanism 14 for preventing retraction of the lead is provided.

A fourth example will be described with reference to FIG. This is an example in which a gear 34 is formed on an operation roller 33, and a gear 35 meshing with the gear 34 is fed out and formed on a roller 36. In this embodiment, the shape of the feeding roller 36 is square, but it may be triangular or pentagonal as in the third embodiment. Further, not only transmission by a gear but also transmission means by a belt or the like may be used. Since the rotation of the operation roller is fed through a transmission member (in this example, a gear) and transmitted to the roller, the core can be extended by rotating the operation roller forward. it can.
A fifth example will be described with reference to FIG. This is an example in which the operation roller of the fourth example is formed large. This operation roller 37
, Two opposing portions are exposed from the operation unit 4. It can be operated with the index finger and the thumb, etc., so that the operability is improved and the operation roller is enlarged, so that it can be fed out with a light force.

A sixth example will be described with reference to FIG. Instead of the core holding member 6, a member for holding the core L is a rotary roller 38.
This is an example. The other mechanism is the same as that of the first example, but the rotating roller 38 may be linked with the feeding roller 8 through a gear or the like. The frictional resistance of the core L to the core holding member is eliminated, and the core L can be smoothly and lightly applied.
Can be paid out. A seventh example will be described with reference to FIGS. The operation roller 39 having a flat peripheral surface is also a feeding roller for feeding a core. A single roller serves both operation and feeding of the core, and has a simple shape, so that it can be manufactured at a very low cost as compared with the above-described example, and therefore, the It can be provided at low cost. The operation roller 39 is disposed on the center axis of the barrel 1. The risk of the index finger touching during writing is low, and erroneous (extending) operation can be prevented. Reference numeral 40 denotes a rotation shaft of the operation roller 39, and the rotation shaft is rotatably supported between the core holding member 6 and the operation unit 4. As shown in FIG. 12, the operation roller may have an H-shaped cross-section, that is, the operation roller 41 may be sandwiched by the operation roller 42. By providing the operation rollers 42 in parallel, it is possible to provide a sharp pencil with good operability regardless of whether it is left-handed or right-handed (eighth example).

A ninth example will be described with reference to FIGS.
By moving the operation roller 43, the ball
This is an example in which the wedge function of the chuck mechanism 14 is released and returned. The operation roller 43 has a feeding roller 44 smaller than its diameter. In this example, the operation unit is formed integrally with the barrel 1, and the wick holding member 46 is disposed inside the operation unit 45 as in the previous example. Is divided into three parts, and is composed of a lead holding part 46a and two guide members 46b. A concave groove 47 for holding the lead is formed inside the lead holding portion 46a, and the guide member 46b
The operation roller 43 (extending roller 44)
The rotary shaft 48 is formed with a long hole 49 that rotates and moves up and down. A guide groove 51 in which a taper slide 50 for pressing the chuck body 16 of the ball chuck mechanism 14 to release the wedge action slides is formed inside the lead holding member 47. The taper slide 50 is
An inclined surface 52 is formed at a rear portion with which the rotating shaft 48 of the operation roller 43 contacts, and a flange portion 53 is formed at an intermediate portion. A pressing cylinder 54 is formed in front of the flange 53 so as to contact the rear of the chuck body 16 and move forward. A resilient member 55 is stretched between the flange 53 and the ball chuck mechanism 14, and the tape is resilient.
In addition to urging the par slide 50 rearward, the operation roller 43 is urged outward from the barrel 1 by the inclined surface 52. Due to this action, a part of the operation roller 43 is exposed from the surface of the barrel 1.

Next, an operation (use) method will be described.
The operation roller 43 is pressed in the radial direction of the shaft cylinder 1 from the state shown in FIG. By this operation, the feeding roll
The rotary shaft 48 comes into contact with the core 44 while the rotary shaft 48 is tapered.
The slide 50 is advanced while compressing the elastic member 55. When the taper slide 50 moves forward, the chuck body 16 of the ball chuck mechanism 14 is moved.
Also advance against the repelling member 17, and the wedge action is released (see FIGS. 18 and 19). In this state, the operation row
When the roller 43 is rotated, the feeding roller 44 is also rotated, and the core is fed. Here, when the pressing operation of the operation roller 44 is released, the taper slide 50 is released.
The chuck body 16 is retracted by the repelling members 55 and 17, and the wedge function is again activated, thereby preventing the core from retracting. When the wick is to be retracted (submerged), the operation roller 43 is pressed in the radial direction in the same manner as in the above operation. The wedge action is released by this operation. At this time, the protruding core is brought into contact with the paper surface or the like to be immersed. The operation roller 43 may be pressed and rotated in the direction opposite to the direction in which the lead is extended to be immersed. In this case, since the core does not have to contact the paper surface or the like, the paper surface is not stained.

[0017]

According to the present invention, a rotary roller having a feed roller portion for feeding a core is disposed in a state of being exposed from a shaft cylinder, and the exposed rotary roller is provided.
Is arranged at a position offset from the axis of the barrel,
Alternatively, a rotating roller having a feeding roller portion for feeding the core is disposed in a state of being exposed from the barrel, and the exposed rotating roller is coaxial with the axis of the barrel. And a retraction restricting means for preventing the retraction of the lead by wedge action near the rotary roller, so that a special lead is not required, and a replacement lead for a general sharp pencil is provided. Can be used, and the finger or paper to be written is not stained by the core powder.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a first example of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is an enlarged view of a main part of FIG. 1;

FIG. 4 is a longitudinal sectional view of a main part showing a second example of the present invention.

FIG. 5 is a longitudinal sectional view showing an operation example of FIG. 4;

FIG. 6 is a vertical sectional view of a main part showing a third example of the present invention.

FIG. 7 is a longitudinal sectional view of a main part showing a fourth example of the present invention.

FIG. 8 is a longitudinal sectional view of a main part showing a fifth example of the present invention.

FIG. 9 is a vertical sectional view of a main part showing a sixth example of the present invention.

FIG. 10 is a longitudinal sectional view of a main part showing a seventh example of the present invention.

FIG. 11 is a sectional view taken along line BB of FIG. 10;

FIG. 12 is a vertical sectional view of a main part showing an eighth example of the present invention.

FIG. 13 is a longitudinal sectional view showing a ninth example of the present invention.

FIG. 14 is an enlarged view of a main part of FIG. 13;

FIG. 15 is a sectional view taken along line CC of FIG. 13;

FIG. 16 is a sectional perspective view of a main part showing the inside of FIG. 13;

FIG. 17 is a perspective view showing the taper slide of FIG. 13;

FIG. 18 is an enlarged view of a main part showing the operation of FIG.

FIG. 19 is a sectional view taken along line DD of FIG. 18;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shaft cylinder 2 Core tank part 3 Core insertion hole 4 Operation unit 5 Space part 6 Core holding member 7 Concave groove 8 Feeding roller part 9 Operation roller 10 Rotary shaft 11 Shaft hole 12 Window hole 13 Tip member 14 Ball chuck mechanism 15 Case 16 Chuck body 17 Repelling member 18 Inclined surface 19 Chuck ring 20 Concave part 21 Rolling element 22 Release button 23 Gap 24 Core protection tube 25 Feeding roller 26 Bottom surface 27 Top roller 28 Feeding roller -29 Operation roller 30 Projection 31 Claw 32 Tooth part 33 Operation roller 34 Gear 35 Gear 36 Feeding roller 37 Operation roller 38 Rotation roller 39 Operation roller 40 Rotation Shaft 41 Feeding roller 42 Operation roller 43 Operation roller 44 Feeding roller 45 Operation unit 46 Core holding member 47 Groove 48 Rotating shaft 49 Elongated hole 50 Tapered slide 51 Guide groove 52 Inclined surface 53 Flange 54 Pressing cylinder 55 Resilient member

Claims (4)

[Claims] 1. A rotary roller having a feed-out roller portion for feeding a core is disposed in a state of being exposed from a shaft cylinder, and the exposed rotary roller is aligned with the axis of the shaft cylinder. A mechanical pencil placed at an offset position. 2. The mechanical pencil according to claim 1, wherein said rotary roller is provided with a retraction restricting means for preventing the core from retracting. 3. The mechanical pencil according to claim 1, wherein a retraction restricting means for preventing retraction of the lead is provided near the rotary roller. 4. A rotary roller having a feed-out roller portion for feeding out a core is disposed so as to be exposed from the barrel, and the exposed rotary roller is coaxial with the axis of the barrel. A mechanical pencil, wherein the mechanical pencil is disposed so as to face upward, and retraction restricting means for preventing retraction of the lead by wedge action is disposed near the rotary roller.