JPH077196Y2 - Automatic centering device for mechanical pencils - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention can automatically perform center feeding during writing, and
The present invention relates to a mechanical pencil automatic centering device capable of automatically and smoothly following the second and subsequent subsequent cores.

[Prior Art and Its Problems] Conventionally, as an automatic centering mechanical pencil, a center detent is mounted, and a slider that is always repelled forward and a rearward allowance of the lead are allowed, but a backward movement is a wedge action. With a ball chuck mechanism that can be blocked with, the slider retreats according to the wear of the core, and the slider returns by releasing the writing pressure, but at that time, pull out the core from the ball chuck and put it in the writing state. It was something to do. However, when using the second and subsequent new cores, it is necessary to expand the ball chuck mechanism, and therefore, the knock cap and the actual opening sho 60-60-8 that are exposed from the writing instrument barrel are required.
As with No. 0983, I had to slide the front part and knock, and I was unable to center the second and subsequent lines while maintaining the writing posture.

[Object of the Invention] The present invention can automatically feed the core during writing by simply pressing the lead protection tube protruding from the tip of the tip or the lead itself while maintaining the writing posture. It is an object of the present invention to provide a mechanical pencil that can automatically follow the succeeding lead after the first one.

[Means for Solving the Problems] The present invention has been made in view of the above problems, and its gist is to provide a first lead gripping mechanism that allows a lead to advance in a shaft cylinder but prevents the lead from retracting. And, via a tilting body that can take an upright posture and a tilted posture in accordance with the forward and backward movement of the lead protection tube, a part of which is exposed from the tip of the tip metal fixed to the tip of the shaft cylinder, A second lead gripping mechanism interlocking with the tilting body is provided, and the chuck of the second lead gripping mechanism is expanded with the backward movement of the second lead gripping mechanism, while the second lead gripping mechanism is moved forward. The automatic centering device for a mechanical pencil is characterized in that the chuck of the second lead gripping mechanism is sometimes closed to allow the lead to move forward.

[Embodiment] Hereinafter, further details will be described based on an embodiment shown in the accompanying drawings.

In FIG. 1, a tip 2 is fixed to the front of the barrel 1 and inside the tip 2, a first chuck ring 3 having an inclined guide surface 3a and a trochanter 4 are formed on the head. A first chuck 5 arranged on the received seat 5a, and a first lead gripping mechanism 7 composed of a first spring 6 interposed between the first chuck ring 3 and the first chuck 5. It is installed. The chuck ring 3 is fixed so as to be interlockable with a lead protection tube 8 which is partially exposed from the tip of the tip metal 2.
A rear end portion of the tilting body 10 can be positioned in a groove portion 9a of an inner cylinder 9 which is clamped and fixed between the tip metal 2 and the shaft cylinder 1 to take an upright posture and an inclined posture. Abutting. Further, behind the tilting body 10, a second chuck ring 11 having a tilt guide surface 11a in a contact position with the tilting body 10 and a trochanter 12 are arranged on a seat 13a formed on the head. Second chuck 13 and a second spring interposed between the second chuck ring 11 and the second chuck 13.
A second lead gripping mechanism 15 composed of 14 is urged forward by the elastic force of the knock spring 16 and attached. A stopper portion 17 is formed inside the barrel 1 at a position facing the rear end of the second chuck 13.

Next, the operation and action will be described based on the configuration described above.

In FIG. 1, the lead L has dropped to the inner stage of the head of the second chuck 13 by its own weight and stopped. Next, when the lead protection tube 8 is pressed against the paper surface or the like, as shown in FIG. 2, the first chuck ring 3 is retracted in conjunction with the lead protection tube 8 and a part of the groove portion of the inner cylinder 9 is retracted.
The tilting body 10 located at 9a tilts with that position as a fulcrum. Then, due to the inclination, the second chuck ring 11 also retracts against the repulsive force of the knock spring 16. In the retracting process, the second chuck 13 has its rear end at the barrel 1. Stopper part formed on
It abuts 17 and spreads the head. By this operation, the lead L passes through the second chuck 13, drops to the inner stage of the head of the first chuck 5, and stops. Next, when the pressure is released, the second core gripping mechanism 15, the tilting body 10, and the first core gripping mechanism 7 are returned to the normal state by the elastic force of the knock spring 16, but the second core gripping mechanism 15 Almost at the same time as the chuck ring 11 is returned, the second chuck 13 closes its head, grips the core L, and returns with the core L gripped. By this return, the lead L causes the first chuck 5 to hold the lead L while pushing the head portion of the first chuck 5 apart (see FIG. 3).

By repeating the above operation (FIGS. 1 to 3), the core L
As shown in FIG. 4, it projects from the tip of the lead protection tube 8 and is ready for writing. As the first lead L decreases, the second lead falls to the rear end due to its own weight, and the first chuck 5 holds the lead L by the same operation, and the lead protection tube 8
Can protrude from the tip. In addition, when writing, the second
Writing will be performed in the state shown in the figure, but the writing pressure can be received by the wedge action of the trochanter 4 of the first chuck 5 and the inclined surface 3a of the first chuck ring 3 to prevent the retraction of the core L. it can.

Next, another embodiment will be described with reference to FIGS. 5 and 6.

The difference from the above-described embodiment is the difference in the configuration of the second lead gripping machine groove, and the description of the overlapping points will be omitted. The same reference numerals are used for the same parts.

In FIG. 5, inside the inner cylinder 29, a protrusion 33a that cooperates with a protrusion 29a provided on the inner cylinder 29 and a grip portion that grips the core L are provided.
Second chuck 33 having 33b, said protrusion 29a and chuck
The second which consists of the knock spring 36 interposed between 33 and
The core gripping mechanism 35 is attached. The second chuck
33 is always open outward.

Next, the operation will be described.

In FIG. 5, the lead L is the lead gripping portion 33 of the second chuck 33.
It has dropped to b due to its own weight and stopped. Next, when the lead protection tube 8 is pressed against the paper surface or the like, the tilting body 10 tilts as shown in FIG. 6, and the second chuck 33 moves backward against the resilience of the knock spring 36. . By this retreat, the protrusion 33a of the second chuck 33 expands when the cooperation with the protrusion 29a of the cylinder 29 is released, and the core L falls to the inner stage of the head of the first chuck 5. And then stop. Then by releasing the pressure,
The second chuck 33 returns due to the repulsive force of the knock spring 36, and by this return, the protrusion 33a of the second chuck 33 and the protrusion 29a of the inner cylinder 29 cooperate again to close the grip 33b. , The core L is gripped, and the tilting body 10 moves forward while gripping the core L until the tilting body 10 returns to the upright posture.
The chuck 5 can hold the core L.

In the above-described embodiment, the first lead gripping mechanism is composed of a chuck ring having an inclined surface, a chuck in which a trochanter is arranged, and a spring. Only the (ball) may be used. The point is that the lead may be allowed to move forward but the lead may be prevented from moving backward.

[Advantage of the Invention] According to the present invention, the first lead gripping mechanism and the second lead gripping mechanism are arranged with the tilting bodies facing each other, and the tip of the mechanical pencil is knocked while maintaining the writing posture. Just by doing, it is possible to provide a mechanical pencil that can automatically feed the lead when writing and also can automatically follow the lead after the second lead.

[Brief description of drawings]

1 to 4 are operation explanatory views showing an embodiment of the present invention, and FIGS. 5 and 6 are operation explanatory views showing another embodiment. 1 ... Shaft cylinder, 2 ... Tip metal, 7 ... First core gripping mechanism, 8
…… Core protection tube, 10 …… Tilting body, 15,35 …… Second core gripping mechanism

Claims (1)

[Scope of utility model registration request] 1. A first lead gripping mechanism which allows the lead to move forward but prevents the lead from retracting in the barrel, and a lead which partially exposes from a tip of a tip metal fixed to the leading end of the barrel behind the lead gripping mechanism. A second lead gripping mechanism that interlocks with the tiltable body is provided via a tilting body that can take an upright posture and a tilted posture according to the back-and-forth movement of the protection tube, and the second lead gripping mechanism. The chuck of the second lead gripping mechanism is expanded with the backward movement of the second lead gripping mechanism, while the chuck of the second lead gripping mechanism is closed when the second lead gripping mechanism is moved forward so that the lead can be moved forward. Automatic centering device for mechanical pencils.