JPS6087098A - Writing utensil - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a so-called mechanical pencil type writing instrument, which is used for writing by drawing out a pencil lead from the tip, and is particularly applicable to automatic drawing machines, X-Y plotters, etc. The present invention relates to a writing instrument suitable for use in a writing head.

[Background technology and its problems]

A so-called mechanical pencil type writing instrument that uses a pencil lead generally uses a lead chunk that grips the lead. Since this lead chuck directly grips the pencil lead, slippage is likely to occur between the lead surface and the collection of the chuck, and when the writing instrument is strongly pressed against a writing surface such as paper, etc. The lead is not likely to be pushed into the writing instrument. Also,
As the length of the lead becomes shorter, the distance between the tip of the writing instrument (the tip where the lead protrudes) and the gripping position of the lead chuck becomes shorter, making it impossible to grip the lead. The lead is unusable, uneconomical, and dull, and the amount of writing that can be done with one lead is small, increasing the frequency of lead replacement.

These drawbacks pose a serious problem particularly when the mechanical pencil type writing instrument is used in an automatic writing device such as an automatic drafting machine or an X-Y plotter. In other words, in the automatic writing device @ mentioned above, the pen's amplifier and down operations are performed in two steps using a solenoid plunger, etc., and 'J? If the impact force or pressing force on the pen tip (tip of the lead) is large during this down operation, or if you increase the up and down speed of the pen to increase the writing speed, or if you increase the pen's up and down speed to increase the writing speed. When a large number of sheets are used, the core is likely to be pushed in, resulting in what is known as core denting. In addition, if the length of the lead remaining between the lead chuck and the tip of the writing instrument (the so-called residual lead amount) is long, maintenance becomes complicated as the frequency of lead replacement increases when using a rinsed lead of the same length. especially,
When using multiple writing instruments with different lead diameters and lead hardnesses, replacing the leads is troublesome.

In this case, it may be considered to use a long core, but
Generally, commercially available cores have a certain length, for example, 6
mm) are abundant in both core diameter and core hardness, and are easily available.

[Purpose of the invention]

In view of the above-mentioned practical experience, the present invention has a strong gripping force on the lead handle by the lead chuck, can prevent the lead from being squeezed, etc., and has a small amount of lead remaining when writing becomes impossible, making it economical. The purpose is to provide a marking device that requires less frequent lead replacement.

[Summary of the invention]

In order to achieve the above-mentioned object, a writing instrument according to the present invention includes a lead guide cylinder whose distal end is provided with a rubber ring into which a pencil lead is inserted, and an end of the lead guided into the lead guide cylinder. A tailstock that abuts the core, a core chuck that grips the core, and at least one of the core chuck and the core guide cylinder are slidable in the axial direction and are provided with a full return force by a spring. It is characterized by comprising a supporting writing instrument mold body.

[Actual θ01 Shio] Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

Figure 1 shows the first practical example of this invention.
-Y This is a cross-sectional view of a writing implement used in an automatic writing device such as Zorotsuta.

As shown in FIG. 1, a writing instrument housing 1 having a substantially cylindrical outer shape is
It is slidably supported by an outer cylinder 3 via a spring 2 for applying string pressure. This outer cylindrical body 3 is the same as above! It is held by a support arm or the like of the one-side navigation device, and is moved up and down (so-called pen amplifier, down drive) by a solenoid plunger or the like through this support arm and the like.

The integrated writing instrument 1 can be separated into a lower cylinder 12 and an upper cylinder 13 by means of a threaded part 11. A lead guide cylinder 4 is supported in the lower cylinder 12 so as to be able to move freely in the axial direction. Inside the cylindrical body 13, a rubber holding tube 5 is slidably supported, and a lead chuck portion 6 is fixedly supported. It gives you the power to return to. And these lower cylindrical body 12 and upper cylindrical body 13 are threaded parts? When the IK is packed, the lower end surface of the rubber holding tube 5 comes into contact with the lower end surface of the core guide cylinder 4, and the return force in the downward direction in the figure by the spring γ is applied to the rubber holding member 5.
The voltage is applied to the core guide cylinder 4 via τ.

A 1° pencil lead is inserted 6 near the tip of the lead kite cylinder 4.
A rubber ring 8 is disposed inside the rubber holding tube 5, and a rubber ring 9 through which the core push rod 2o is inserted is disposed inside the rubber holding tube 5. The core push rod 201''j is made of, for example, metal or the like and is bent in the shape rJy, and the holding force by the core chuck portion 6 is strong, and the above-mentioned phenomenon of the core sinking in can be prevented.The diameter of this core push rod 20 is as follows. The diameter may be equal to the diameter of the core 10, but it may be different, for example, H-4q of the core 10.
9.3 mrn % Diameter of tailing rod 20 ((can also be 0.5 mm).

Note that the pencil lead 10τ has the ability to separate the writing instrument body 1 into the threaded part 11 and into the lower cylinder 12 and upper cylinder 13.
This is to facilitate guide insertion into the lower cylindrical body 12. These cylinders 12. ．． 13e may be integrated, and the core 10 and the core push rod 20 may be inserted in this order from the opening at the upper end of the soap writing instrument housing 1.

Here, the outer cylinder 3 of such a writing instrument is held and fixed by the gripping member 16 of the support arm of the automatic writing device, but this support arm can be used with a conventionally known X-Y plotter or the like. Self! It is similar to the support arm of the writing head of a 111I drafting machine, etc., and a solenoid plunger etc. is attached to a movable base etc. that is controlled to move in the X-Y direction 11jJ on the writing surface. Amplifier, down drive! 11. It is installed via iJ machine #4. Further, a lead guide stopper IT attached to the movable base or the like comes into contact with the flange 4a formed near the tip of the lead guide cylinder 4, and the lead guide stopper IT from the writing surface G of the lead guide cylinder 4 comes into contact. The height position is of course regulated. Furthermore, a lead wear detection plate 1 is provided on the flange 12a provided on the lower cylinder 12 of the writing instrument housing 1, for example.
By detecting the amount of movement of the detection plate 18 in the axial direction (vertical direction in the figure), the amount of wear of the core is detected.

Next, the core chuck portion 6 can of course hold the core push rod 20, but if it is arranged in the same manner as a general core chuck, it may have the internal structure shown in FIG. 2.

In FIG. 2, the core chuck portion 6 has a collet member 22 disposed in a substantially cylindrical chuck holder 21 with a slightly swollen lower end and a vertically split portion. When the coil bye 23 is biased upward in the figure, a ring 24 fitted into the lower end portion grips the core etc. in such a way that the diameter of the bulged portion of the shikoret member 22 can be knitted. Regarding the lead gripping action of the lead chuck capital 6, when an upward force is applied to the lead etc., a strong holding force is exerted, but when the lead etc. is pulled downward, the holding force becomes weak and the lead etc. easily pulled downwards.

Here, the core chunk portion 6 grips the core pusher 20, and this core pusher 20 holds the rubber ring 9 in the rubber holding tube 5.
The core feed-out operation (feed-out operation of the core pusher) when the core is inserted into the core will be explained with reference to FIG. At this time, when the core chuck part 6 and the tube body 5 move relative to each other so as to approach each other, for example, when the core chuck part 6 moves downward in the figure (a or the tube body 5 moves upward in the figure). , since an upward force in the figure is applied to the core push rod 20 due to the sliding friction force of the rubber ring 9, the core push rod 20 is firmly held by the core chuck portion 6 and slides downward in the figure within the tube body 5. move. On the other hand, the core chuck portion 6 and the tube body 5
For example, when the core chuck portion 6 moves upward in the figure (or the tube body 5 moves downward in the figure), the force of the friction of the rubber ring 9 causes the force of the core push rod 20 to move away from each other. The holding force by the core chuck part 6 is smaller than the holding force by the core chuck part 6.
1 is held and fixed, and only the core chuck portion 6 moves upward.

In this manner, each time the core chunk portion 6 reciprocates in the axial direction (vertical direction in the figure) with respect to the rubber holding tube 5, the core push rod 20 is drawn out from the core chuck portion 6 downward in the figure.

By the way, FIG. 1 shows the bent-down state when the amount of feed of the lead 10 is a constant value (initial setting 1lII). At this time, the flange 4a near the tip of the lead guide cylinder 4 is supported by the lead guide stopper 1γ, so that the pencil lead 10 protrudes by the distance P between the tip of the lead guide cylinder 4 and the writing surface G. I will do it. The outer cylindrical body 3 is held by the grip member 16 of the support arm described above at a fixed position with respect to the tortoise plane G, for example, at a position where the lower end of the outer cylindrical body 3 is at a height Q, and is then processed 29. A pressing force is applied to the writing instrument housing 1 via the pressure spring 2. This pressing force is applied to the tailing rod 20 via the core chuck portion 6, and this pushing force
Since the lower end of the pencil presses the upper end of the lead 10 of the pencil, the lower end of the lead 10 presses the paper or the like on the writing surface G to obtain a so-called voltage. Note that the height R of the upper end surface of the flange 12a of the writing instrument housing 1 at this time is detected by the detection plate 18, and by detecting this height R, the lead chuck is substantially detected. The distance S from the lower end of section 6 to memorization surface G is detected.

Further, the distance between the lower end of the core chuck portion 6 and the rubber ring 9 of the rubber holding tube 5 is, for example, D.

When the lead 10 is worn out as a result of writing, the writing instrument housing 1, lead chuck 6, lead rod 20, and lead 10 are moved downward in the figure by an amount corresponding to the amount of lead wear. This is because the pressure spring 2 presses the writing instrument housing 1 downward in the figure against the outer cylinder 3, and eventually, as shown in FIG. The lower end surface of the portion 12a is the outer cylindrical body 3.
The above-mentioned downward feeding operation can be performed until it comes into contact with the upper end surface of the holder and is locked. In the state shown in FIG. 3, the distance between the lower end of the lead chuck part 6 and the rubber ring 9 is D-tK&, which is due to the core pusher firmly held by the lead chuck part 6 during the above-mentioned writing operation. This is due to the fact that 2o slides inside the rubber ring 9 and descends by the amount of core wear. Then, before reaching the state shown in FIG. 3, or worse, the detection plate 18 detects that the core wear amount t has reached a predetermined set value (for example, about 0.5 to 1.0 m). , all writing operations are interrupted and the pen amplifier operation is forced. This pen-up operation is performed by pulling out the lead (tail pusher 20) from the lead chuck portion 6.

Figure 4 shows the state of the pen amplifier, and the tip of the 1° lead is the fallen surface G,! In order to float and separate, the rubber holding tube 5 is pressed downward in the figure against the core chuck part 6 by the action of the quick return spring 7, and the distance between the rubber ring 9 and the lower end of the core chunk part 6 becomes D. That is, when transitioning from the pen down state shown in FIG. 3 to the pen amplifier state shown in FIG. The core stock rod 20 is pulled out from the core chuck portion 6 by a distance t.

According to the above-described embodiment of the present invention, the lead pusher 20 made of a metal rod or the like is held by the lead chuck portion 6, and the lead 10 of the pencil is pressed by this lead pusher 20. The lead holding force (holding force of the core pusher 20) is extremely strong, and even if the tip of the lead is strongly pressed against the writing surface G, the lead will not be pushed in, and writing operations can be performed without any trouble. It can protect the core. Furthermore, since the core 10 is fed by the core push rod 20, the amount of remaining core can be extremely reduced.

These are preferred when applied to automatic writing devices in %
Even if you try to speed up the writing operation, you can still write smoothly without any nicks or scratches on the lead, and you can also lengthen the lead replacement cycle.
There is less need to replace the core during use. For example, in the case of an automatic writing device that automatically exchanges multiple writing instruments with different lead diameters and lead hardnesses, this is very advantageous in terms of handling because it reduces the frequency of replacing the lead of each writing instrument. It is.

Furthermore, according to the above-mentioned actual pain sequence of the present invention, the feeding operation of the lead 10 is automatically performed in conjunction with the landing and floating movements of the lead tip of the writing instrument, so-called pen down, and pen amplifier movements, so that the lead tip can be moved to the writing surface. The forcible feeding operation of the lead 10 is not performed unless the lead abrasion t when drawing with a single stroke while the GK is in pressure contact exceeds the above-mentioned fixed value (for example, (about 1.5 to 1) f:.

In addition, if the amount of lead wear when drawing with the above-mentioned brush exceeds the above-mentioned certain value, a change in the height position of the writing instrument housing 1 from the tortoise surface G is provided in relation to the detection plate 18. For example, the lead 10 is detected by a position detection means constituted by a photointerrupter, etc., and according to this detection output, the writing instrument is moved up and down by temporarily stopping the writing operation and driving a solenoid plunger or the like by τ suction. The delivery is forced. Then, after this lead edge drawing operation is completed, the temporarily stopped writing operation may be continued.

In this case, it should be noted that the detection of lead wear is carried out regularly during the writing operation, and there is no need to interrupt the whole writing operation just to detect this lead wear. Therefore, by driving the writing instrument in the vertical direction by a single solenoid plunger for pen up and down, the tip of the lead 1o lands on the writing surface G for scribing, the floating operation, and the movement of the lead 1o. Since the feeding operation and the feeding operation are performed at the same time, there is no need to provide separate drive means such as plungers for each.
The configuration is simple. In addition, since the wear condition of the lead 1o and the amount of height position movement of the writing instrument housing 1 are detected, the amount of lead wear can be checked with a simple structure, and the amount of displacement of the writing instrument housing 1 even during writing operation. Since the detection is carried out continuously, there is no need to interrupt the recording operation just to check for core wear.

Furthermore, at the start of the starting operation, etc., even if the pen is down, the pen housing 1 reaches the lowered position K with respect to the outer cylinder 3 (for example, see FIG. 3), and the detection plate 18 detects lead wear. In such a case, if the pen amplifier is bankrupt, the down operation may be repeated to perform the lead edge push-out operation, and when a predetermined lead edge push-out amount is reached, the writing operation may be performed. In this case, the pen amplifier down operation is performed a predetermined number of times [for example, 5
If the predetermined amount of lead feeding does not reach a predetermined lead amount even after the retardation is repeated (approximately 6 times), an alarm or the like may be issued to request the lead to be replaced.

Next, FIG. 5 shows a second embodiment of the present invention, in which a core guide cylinder 4' is used without using the rubber holding tube 5 of the first embodiment.
A rubber ring 9 into which the tailing rod 20 is inserted is arranged near the upper end of the rubber ring 9. The rear spring γ' directly presses the core guide cylinder 4'. Since the other configurations are the same as those of the first embodiment, the same parts in the drawings are denoted by the same reference numerals and the explanation will be omitted. The operation and effects of this second embodiment are also similar to those of the first embodiment.

Note that the present invention is not limited to the eleventh and second embodiments, for example, the outer cylinder 3 can be used to directly hold the writing implement 1 in the hand and write while applying writing pressure. You can also do this. In this case, the tip of the lead guide cylinder 4 (or 4') comes into contact with the writing surface G and slides as you write, and as the lead wears away, the chain case casing moves against the lead guide cylinder 4. As the body 1 descends, the return spring γ (
Alternatively, according to 7'), the lead guide cylinder 4 moves downward (returns) relative to the writing instrument holding body IK by the amount of lead wear described above. Automatic core feeding (lead feeding) operation is performed by such axial reciprocating motion of the lead guide cylinder 4 and the stone marking tool housing 1, that is, vertical movement in the figure.

〔Effect of the invention〕

According to the writing instrument according to the present invention, the lead chuck part does not directly hold the lead of the pencil, but holds the lead rod made of metal or the like, so the holding force is strong and the lead can be protected. I can do it. In addition, since the core is fed out with a core pushing rod, the amount of remaining core can be extremely reduced, making it economical, and the frequency of core replacement is low, making it convenient to use. Particularly, when used in an automatic writing device, smooth writing operation can be guaranteed even when the writing speed is increased, and maintenance such as lead replacement is simplified.

[Brief explanation of drawings]

FIG. 1 is a schematic sectional view showing the first embodiment of the present invention;
The figure is a sectional view showing a specific structural example of the core chuck part and the rubber holding tube used in this embodiment, and FIGS. 3 and 4 are schematic sectional views showing different operating states of the embodiment of FIG. 1. , FIG. 5 is a schematic sectional view showing a second embodiment of the present invention. 1... Writing instrument electric body 2... Pressure spring 6... Outer cylinder body 4.4'... Lead guide cylinder body 5... Rubber holding tube body 6...Lead chuck part 7.7...Return spring 8.9...Rubber ring 10...Pencil lead 20...Tip stick patent applicant Max Stock Company Representative Patent Attorney Akira Koike Figure 1 Figure 2 Figure 5

Claims (1)

[Claims] A lead guide cylinder whose tip is provided with a rubber ring through which a pencil lead is inserted, a tailstock rod that comes into contact with the end of the lead guided inside the lead guide cylinder, and a gripper for the tailstock rod. A writing instrument housing that supports at least one of the lead chuck and the lead guide cylinder so as to be slidable in the axial direction and to apply a return force by a spring. Writing implements.