JPS6322998B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention is capable of automatically automatically turning the tip of the tip into the shaft and repeating the pressing operation when the core wears out during use or when the core does not protrude beyond the tip. This invention relates to an automatic mechanical pencil that feeds and feeds a lead.

This type of device has been proposed before, but none of them have complicated mechanisms and are difficult to assemble, and even if they can be assembled, there are none that automatically feed out the lead by pressing the lead while writing. Ta.

With this invention, the lead can be reliably supplied automatically whether you press the lead while writing or the tip of the tip, and therefore, you do not have to wait until the lead protrudes short and almost touches the tip. When you press the lead, the lead is automatically fed out, allowing you to write reliably without the tip of the metal tip touching the paper and tearing the paper, or making it difficult to write because you cannot see the lead while writing. You can write while looking at the lead inside, and each person can freely set the centering length to their preference, so it is suitable for everyone.
The purpose is to provide a truly convenient and useful sharpening pencil at a low price.

The structure of the present invention will be explained in detail with reference to an embodiment shown in the drawings.A shaft cylinder 1 includes a front shaft cylinder 3 having a base 2 screwed onto its tip, and a rear shaft cylinder 5 having a guide cylinder 4 fixed to its rear end.
and are integrally connected by a relay pipe 6. Sliding tube 7
consists of a tip 8, a front cylinder 9, and a rear cylinder 10, and is slidably fitted into the front cylinder 3, and a core storage cylinder 11 slidably fitted into the rear cylinder 5. A compression coil spring 12 is stretched between the sliding tube 7 so that the tip 8 is attached to the stepped portion 2a of the base 2, and the core storage tube 11 is attached to the guide tube 4.
are urged so as to come into contact with the step portions 4a of the respective parts. A lead holder 13 made of an elastic material such as rubber is provided at the center of the tip 8, and lead holding mechanisms 14, 15, and 16 are formed at the front and rear portions of the front tube 9 and at the rear tube 10, respectively. . The first clamping mechanism 14 has a clamping protrusion 14a formed on the inner surface of the front cylinder 9 with a tapered surface that becomes funnel-shaped toward the rear, and a collect chuck 14b is fitted to correspond to the clamping protrusion 14a. .
The collet chuck 14b has an enlarged portion 14c having a notch at its tip, and a flange 14d at its rear end. A compression coil spring 14e is elastically mounted between the collar portion 14d and the clamping protrusion 14a, and a rolling ball 14f is inserted into a recess formed on the outer peripheral surface of the enlarged portion 14c, and the elasticity of the compression coil spring 14e is Therefore, the enlarged portion 14c of the collection chuck 14b is clamped by the tapered surface of the clamping protrusion 14a via the rolling ball 14f. The second core clamping mechanism 15 has the same structure as the first core clamping mechanism 14 except that the clamping protrusion 15a is formed in the second core clamping mechanism 14. That is, the clamping protrusion 15a is formed on an inner cylinder 17 that is slidably fitted into the front cylinder 9, and allows the rolling ball 18 fitted into the fitting hole 9a formed in the front cylinder 9 to be held forward. The inner surface of the shaft cylinder 3 and the outer peripheral surface of the inner cylinder 17 are pressed against each other so that the rolling balls can roll. The third core clamping mechanism 16 has the same structure as the first core clamping mechanism 14 except for the portion where the clamping protrusion 16a is formed and the rear end portion of the collect chuck 16b. That is, the clamping protrusion 16a is formed on the rear cylinder 10, and the rear end of the collection chuck 16b holds the core A from the core storage cylinder 11.
It is shaped like a funnel of 16g so that it can be sent out one book at a time.

Note that 19 is a rubber eraser body, which is detachably fitted to the rear end of the lead storage tube 11. Reference numeral 20 is a knock bar, which is detachably fitted between the lead storage tube 11 and the guide tube 4.

Next, to explain the operation, FIG. 2 shows a state in which three collection chucks hold the core firmly. When the tip of the tip is pressed against the surface of the paper in this state, the compression coil spring 12 is compressed via the front tube 9 and rear tube 10, and the tip 8, front tube 9, and rear tube 10 move rearward. . Due to this movement, the rolling ball 18 fitted in the front cylinder 9 rolls on the inner surface of the front shaft cylinder 3 and retreats, so this rolling ball 18
The rotation acts as a force that pushes the outer circumferential surface of the inner cylinder 17 which is in pressure contact with the inner cylinder 17 rearward, and moreover, the inner cylinder 17 is moved back at twice the speed of the movement amount by which the front cylinder 9 moves backward. As a result, the entire second core holding mechanism 15 moves back at twice the speed of the front cylinder 9, so when the collection chuck 15b tries to pull the core A,
The first and third collect chucks 14b and 16b, which are retracting at the same speed as the core A, are increasingly attached to the respective clamping protrusions 1.
4a, 16a to firmly clamp the lead A, the second collection chuck 15b moves slightly later than the movement of the clamping protrusion 15a. That is, since it has moved relatively in the direction of the tip, it slides on the core A and retreats. Next, when the pressing force is released, the tension of the compression coil spring 12 returns to the original direction. At this time, the rolling ball 18 fitted into the front cylinder 9 returns while rotating in the opposite direction to that described above. Therefore, the inner cylinder 17 moves in the return direction at twice the speed of the sliding cylinder 7. Therefore, the second collect chuck 15b comes to bite into the clamping protrusion 15a, firmly clamps the core, and returns. On the other hand, the first collecting chuck 14b and the third collecting chuck 16b move at twice the speed of the movement of the front cylinder 9 and the rear cylinder 10, so that the core A, which is clamped to the second collecting chuck 15b, moves at twice the speed of the movement of the front cylinder 9 and the rear cylinder 10. Clamping protrusions 14a, 16a
As a result, the clamping force is released and the lead A slides forward in the first and third collect chucks 14b and 16b. Therefore, when the pressing force is completely released, as shown in FIG. 4, a portion of the lead corresponding to the amount of push-in protrudes from the tip of the tip 8, resulting in a writing state. In this writing state, unless a force greater than the resistance of the compression coil spring 12 is applied, it is considered to be fixed.

Now, from this state (FIG. 4), if the tip of the core is again pressed against the surface of the paper as described above, the above action can be repeated to make the cores of a desired length protrude one after another.

When writing is finished and the protruding lead A is to be stored in the barrel 1, it is sufficient to press the tip of the lead against the surface of the paper while pressing the knock bar 20 (FIG. 5). As a result, the compression coil spring 1 is pressed at the same time as the core storage cylinder 11.
2 contracts, and the forward movement of this lead storage cylinder 11 pushes the rear end surface of the third collect chuck 16b forward, and the third collect chuck 16b pushes the second collect chuck 15b forward.
Since the second collection chuck 15b further pushes the first collection chuck 14b, the respective collection chucks 14b, 15b, 16b are released from the clamping protrusions 14a, 15a, 16a, so that the core holding force is lost. However, the lead holder 13 inside the tip 8 holds the lead A lightly with its elastic force, so if left as is, the lead will remain in the same position. Accordingly, it can be retracted smoothly.

Next, when using it for the first time, press the lock bar 20 as described above to open all three collection chucks 14b, 15b, and 16b, so that the core A
falls from the lead storage cylinder 11 to the position of the lead holder 13 of the tip 8 by its own weight alone. Next, Notsukuba 2
When the pressing force of 0 is released, each of the collection chucks 14b, 15b, 16b closes and the lead A is held in each collection chuck. At this stage, if the tip of the tip 8 is pressed several times, the respective lead holding mechanisms 14, 15, 16 work together to send out the lead A as described above.

Furthermore, if the lead in use becomes shorter and shorter and comes off the second collect chuck 15b as shown in FIG. 6, it will not be fed out no matter how much the lead A in use is pushed. That is, the second collect chuck 15b
If the wick does not cooperate with the first collect chuck 14b, press the knock bar 20 at this point, bring the spare lead in the lead storage cylinder 11 into contact with the end of the used lead by its own weight, and insert a new lead into the second collect chuck 15b. If you hold A in your mouth and let go of the lock bar 20, the second collect chuck 15b and third collect chuck 16b will hold a new lead, so if you press the tip of the lead you are using again, this time, the second collect chuck 15b and third collect chuck 16b will
The third collection chuck 15b and the third collection chuck 16b work together to perform the core feeding action. Therefore, the new lead is fed out by repeating the pressing operation of the lead, pushing the used lead back, and the new lead can again be in a state of protruding from the tip. (FIG. 7) Note that one of the first core clamping mechanism or the third core clamping mechanism in the above embodiment may be omitted.

As described above, the self-feeding sharp pencil of the present invention is capable of reliably feeding out and ejecting the leads one after another by pressing the tip or lead at the tip of the shaft. To provide an easy-to-use sharp pencil that allows the user to continue writing without having to change the grip, and does not cause the user to feel the trouble of centering. In addition, the core feeding mechanism employs an extremely simple structure in which a rolling ball fitted into a sliding tube is pressed against the shaft tube and the inner tube, and the inner tube is moved at double speed as the sliding tube moves. ,
It has the excellent effects of being able to produce a sharp pencil with no product variation, reliable operation within a limited barrel, good quality control, easy assembly, and inexpensive sharpening pencils. .

[Brief explanation of the drawing]

FIG. 1 is a vertical side view of the entire sharpening pencil of the present invention, and FIG. 2 is a vertical side view of the main parts,
FIGS. 3 to 7 are half-cut longitudinal side views showing the operating state, and FIG. 3 is a diagram of the state in which the tip is pressed, and FIG. The figure shows the state in use when the tip is released and the lead is fed out, Figure 5 shows the state when the knock bar is pressed, and Figure 6 shows the state in which the lead is fed out.
The figure shows a state in which the lead is shortened, and FIG. 7 shows a state in which a new lead is supplied and fed out. 1...Shaft tube, 7...Sliding tube, 8...Tips, 11
... Core storage cylinder, 12 ... Compression coil spring, 14 ...
...First core clamping mechanism, 15...Second core clamping mechanism, 1
6... Third core clamping mechanism, 14a... clamping protrusion, 1
4b... Collection chuck, 14e... Compression coil spring, 14f... Rolling ball, 15a... Clamping protrusion,
15b... Collection chuck, 15e... Compression coil spring, 15f... Rolling ball, 16a... Clamping protrusion, 16b... Collection chuck, 16e... Compression coil spring, 16f... Rolling ball, 17... Inner cylinder,
18... Rolling ball.

Claims (1)

[Claims] 1 A compression coil spring is stretched between the sliding tube with the tip and the core housing tube, and the tip is biased toward the tip of the barrel and the core housing tube is biased toward the rear end of the barrel. At least two core clamping mechanisms are formed between the storage tube and the sliding tube tip, and these core clamping mechanisms have a clamping protrusion and a collect chuck that engages with the clamping protrusion. It is configured so that it becomes free by relatively moving in the direction of the tip,
The at least one core clamping mechanism clamping protrusion is formed on an inner cylinder fitted in the sliding cylinder, and is in pressure contact with the inner cylinder and the shaft cylinder, respectively, and moves the inner cylinder at twice the speed of the movement of the sliding cylinder. This self-dispensing sharp pencil is characterized by having a rolling ball disposed in a sliding tube that moves the tip, and automatically feeding and feeding the lead by pressing the tip.