JPS62158099A - Propelling pencil - 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 [Field of Industrial Application] The present invention relates to a mechanical pencil whose lead is automatically advanced by releasing a slider from writing on a paper surface or the like.

[Conventional technology]

Recently, a slider that can freely slide inside the tip and multiple spouts +)
Various so-called automatic mechanical pencils have been proposed, which have a combination structure such as 7-g, and can automatically feed the lead by releasing the pressure of the slider from the paper surface. However, all of them have problems in that the internal structures such as the lead feeding mechanism are very complicated, the efficiency of assembly work is poor, and the number of parts is large, making them expensive.

[Summary of the invention]

This invention was made to solve the above-mentioned problems, and the internal structure can be simplified, and the lead feeding operation can be performed in three ways. of course.

On the other hand, it is an object of the present invention to provide a mechanical pencil that can always provide a constant amount of protrusion even if the pencil protrudes excessively by more than a predetermined amount.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, an outer cylinder 1 has a tip 2 at its tip, and a core pipe 3 inside thereof so as to be slidable in the front axial direction. At the tip of this core pipe 3, there is a tip receiving part 4.
is fitted, and the contact distance (
The core delivery mechanisms 5 are arranged at intervals of a).

The tip receiving portion 4 has a tip hole 4a for suppressing and holding the rear end of a lead chuck 6, which will be described later, and the tip receiving portion 4 is movably engaged with the sleeve T.

Here, the engagement between the tip receiving part 4 and the sleeve 7 is such that the two move integrally until the sleeve 7 comes into contact with the tip tube 9.
After that, any structure may be used as long as only the tip receiving portion 4 can move forward, such as the one shown in the second figure.

In the embodiment shown in FIG. 2(a), a foot-shaped protrusion 4b that movably engages with the recess 7a of the sleeve 7 is protruded from the tip receiving part 4.

Further, FIGS. 2(b) and 2(e) show another embodiment of the sleeve 7, in which a groove 7b that movably engages with the convex portion 4c of the tip receiving portion 4 is formed. This groove 7b has a protrusion 7c.
is provided, and the groove width A in this part is formed smaller than the width of the convex part 4C, and until the sleeve 7 comes into contact with the front cylinder 9, the convex part 4c is locked with the protrusion 7c of the groove 7b, and both are integrally connected. moves. After that, the convex portion 4c pushes the protrusion 7c open and moves forward, and only the tip receiving portion 4 is formed so that it can move forward to the tip of the groove 7b.

Also, l! In the case of FIG. 2(c), since the inclined part 7d, which is narrower in width than the protrusion 4c, is formed in series with the protrusion 7c of the groove 1b, the protrusion 7c remains even after the protrusion 4c passes over the protrusion 7c. 4c moves forward while pushing and expanding the inclined portion 7d.

Moreover, FIG. 2(d) also shows another embodiment of the sleeve T,
A rough surface 7e that provides a predetermined resistance to the convex portion 4C on a part of the groove 7b.
is formed. This rough surface 7e provides resistance to the convex portion 4c until the sleeve 7 comes into contact with the tip tube 9, causing the tip receiving portion 4 and the sleeve 7 to move integrally, and thereafter. Only the tip receiving part 4 can move forward.

FIGS. 2(e) and 2(f) similarly show other embodiments of the sleeve 7, in which a bent groove 7b is formed, and the sleeve 7
and the tip receiving portion 4 are formed to be movable in the same manner. In particular, the width A of mrb in FIG. 2(e) is the width B of the convex portion 4c.
The sleeve 7 and the tip receiving part 4 are narrow enough to provide a predetermined resistance to the convex part 4c, and the width C is wider than the width B of the convex part 4c.
are formed to allow the above-mentioned movement. Further, a rough surface 7e that provides a predetermined resistance to the convex portion 4c is also formed in the groove 7b in FIG. 2(f).

Furthermore, FIG. 2(g) also shows another embodiment of the sleeve 7, in which a bent groove 7b is formed in the sleeve 7. The width A of the groove 7b is narrower than the width B of the convex portion 4c, and the two move together until the sleeve 7 comes into contact with the front cylinder 9, as in the above embodiment.

After that, only the tip receiving portion 4 is formed to move forward.

No. 21) also has a bent groove 7b with a protrusion 7c and a locking inclined surface 7.
f1.7f2 and has the same effect as each of the above embodiments.

In the embodiments shown in FIGS. 2(b) to 2(h)'f, a pair of protrusions 4c and #7b are formed facing each other.

In addition, as shown in the first figure, the rear end of the sleeve 7 and the tip receiving part 4
A distance (b) is provided between the flange portion 4d and the flange portion 4d.

In addition, the lead delivery mechanism 5 is equipped with a ball 11 held in a ball holding portion 10 on the head of a lead chuck 6 formed in two parts, and a lead chuck 6 mounted therein, with the rear end attached to the above-mentioned tip. It has a sleeve 7 engaged with the receiving part 4, and a first elastic body 12 for clamping the chuck, which is elastically attached between the sleeve 7 and the locking step 6a of the lead chuck 6.

The lead chuck 6 is forged or pressed.

It is made of a sintered alloy, a metal molded product formed by milling, or a synthetic resin formed by injection molding or compression molding.

In this embodiment, the lead chuck 6 is arranged in two directions along the axis of the core insertion hole 6o as shown in FIGS. 1, 3, and 4.
It consists of a pair of chuck members 61 and 62 which are divided into parts, each having a hemispherical cross section, and include the ball holding part 10, a rear locking step part 6a, and a rear end of the locking step part 6a. A rear tapered cylindrical portion 6b that extends and gradually becomes smaller in diameter on the rear end side, the core insertion hole 60 in the shaft center portion, and an engagement recess 7.
1°72, engagement convex portion To, 73, and opening/closing fulcrum convex portion 74
゜75.

Here, the engagement concave and convex portions connect the engagement convex portion TO of one chuck member 61 to the engagement concave portion 72 of the other chuck member 62.
The chuck members 61 and 62 are respectively engaged with each other to prevent the chuck members 61 and 62 from shifting from each other in the axial direction.

In addition, the opening/closing fulcrum convex portion 74.7 of the chuck member 61.62
5 are brought into contact with each other, and the chuck members 61 and 62 function as a fulcrum for levering in the opening/closing direction, and there is a sufficient clearance K to allow smooth levering (see Fig. 1).
It also has a spacer function to form a .

And on the inner wall of this lead chuck 60 head.

Teeth 63,64 are formed. This tooth part 63°64
As shown in FIGS. 3 to 8, the chuck member 61
．． A plurality of center teeth 63 are arranged at regular intervals along the center line of the inner circumferential surface of the half core insertion hole 60 in 62, and a plurality of center teeth 63 are arranged alternately at regular intervals between these seven/ter tooth parts 63. It consists of side teeth portions 64 that are displaced on both sides.

In these tooth portions 63, 64, the center tooth portion 63 consists of the front and rear tapered surfaces 63a and the vertical surfaces 63b at both ends, and the side tooth portions 64 consist of the front and rear tapered surfaces 64a, the vertical surfaces 64b on the inner end side, and the outer side. The tapered surface 64c on the end side and the side teeth 64 overlap the center teeth 63 at a constant interval along the inner peripheral surface of the half core insertion hole 60 between the center teeth 63. It has an array configuration.

Therefore, each tooth portion 63, 64 has a sharp tip, and each tooth groove bottom portion 63C164d is formed in a planar shape.

By arranging the tooth portions 63 and 64 alternately at regular intervals in this manner, it becomes difficult for dust such as core dregs to accumulate. Furthermore, each tooth groove bottom 63c
, 64d are formed in a flat shape, which also makes it difficult for dust such as core dregs to accumulate.

In addition, if the arrangement structure of each tooth portion 63, 64 can properly hold the lead and effectively remove accumulations of lead waste, etc., for example,
As shown in Figure 9, it has a /\-shaped halo shape.

Any array etc. may be used. Furthermore, each tooth part 63゜6
4 may be spaced apart from each other in the front, rear, left and right directions, or may be provided continuously.

As shown in FIG.
A metal tube 7h made of stainless steel or the like is fitted and attached to g as necessary. This metal cylinder 7h allows reliable, durable and stable rolling contact, and also ensures reliable core holding of the lead chuck 6 and increases durability.

Here, this metal cylinder 7h is not necessarily necessary.

In normal use, the inner tapered wall 7g is connected to the ball 11.
The metal cylinder 7h may be omitted by forming the metal cylinder 7h in a rolling contact form. Furthermore, an annular protrusion TI may be provided at the tip of the inner tapered wall 7g of the sleeve T or the tip of the metal tube 7h, as shown by the dotted line in FIG. 1, if necessary. This effectively prevents the ball 11 from falling off.

In the embodiment shown in FIG. 1, the distal end of the sleeve 7 has an inner tapered wall 7g, but is not limited to this, and may be a parallel wall substantially parallel to the axial direction.

Furthermore, a locking convex portion 6c that engages with the engagement recess 4e of the tip receiving portion 4 may be provided protruding from the rear end portion of the lead chuck 6 as shown in FIG. Note that the concave and convex portions may be reversed. These uneven portions 4e and 6c prevent the lead chuck 6 and the tip receiving portion 4 from instantaneously separating when the knock is released, thereby preventing the core feeding operation from becoming insufficient.

That is, during the knocking operation, the lead chuck 6 is pressed by the tip receiving portion 4, moves forward, and comes into contact with the tip tube 9.

Thereafter, the lead chuck 6 is released and moved forward by the engagement between the tip hole 4a of the tip receiving part 4 and the rear end of the lead chuck 6, thereby feeding the lead.

Here, even immediately after the knock is released, the concave portion 4e and the convex portion 6c
That is, the outer stepped portion T of the sleeve 7 is engaged with the inner stepped portion 15a of the middle frame 15 until it retreats and comes into contact with the inner stepped portion 15a of the middle frame 15. During this time, the lead chuck 6 is released and the lead is smoothly fed.

In the embodiment, the lead chuck 6 is divided into two parts, but it may be divided into three or more parts, or it may be formed as a single piece. Further, in order to prevent the lead chuck 6 from shifting in the axial direction, it is preferable to form a concave-convex retaining section or a jagged part to prevent slippage in the mutual contact portion.

Further, a part of the diameter of the lead chuck 6 is very close to the inner diameter of the middle frame 15, and the rear end of the first elastic body 12 is securely engaged by the engagement step portion 6a of the lead chuck 6. Therefore, the lead chuck 6 is reliably prevented from rattling or shifting in the vertical and horizontal directions.

Further, the ball holding portion 10 of the lead chuck 6 is as follows.

It may also be a hole that simply holds the ball 11.

The ball 11 may be stored and held so that it does not fall off. Note that the ball 11 is rotatable within the ball holding section 10.

Further, the elastic body 12Fi of jXl has a weaker elastic force than the second elastic body 13 described later.

The core delivery mechanism 5 described above is almost entirely housed in the middle frame 15. This middle frame 15 is disposed within the outer cylinder 1 so as to be slidable in the axial direction, and is heated forward by a third elastic body 17. and.

A front tube 9 is provided at the tip of the middle frame 15, an inner stepped portion 15a is provided on the inner wall, and an outer stepped portion 15b is provided on the outer periphery.

There is a distance R between the rear end 9a of the front tube 9 and the tip of the sleeve 7.
(e) is provided. This distance (e) is complementary to the amount of core feeding during the core feeding operation by rear end knocking, as will be described later. Here, the front tube 9 is fitted to the tip of the middle frame 15, as will be described later.

Any material may be used as long as it comes into contact with the leading end of the advancing lead chuck 6 and has the function of stopping the lead chuck 6 and pressing the rear end of the slider 16, and can perform these functions.

Please note that the inner step 15a of the middle frame 15 is the outer step 7 of the sleeve 7 during writing. is engaged with.

Therefore, the sleeve 7 is pressed forward by the middle frame 15 which is urged forward by the elastic body 1T of wc3 that resists the writing pressure. The third elastic body 1T has the following three
fulfill two functions. ■A function to prevent core pipe 3 from rattling.

■The biasing force of this third elastic body 1T is stronger than normal writing pressure, but it has a cushioning function that retracts the middle frame 15 in the event that excessive writing pressure is applied to the lead 14 during writing. (2) When an eraser (not shown) is provided at the rear end of the core pipe 3, this function is to support the eraser when the eraser is in use.

Incidentally, the elastic body 17 of $3 is subjected to a compressive force in the direction of compression by the middle frame 15 which is moved backward due to the tip knock during the core feeding operation described later. Here, the eraser support function of urging the core pipe 3 backward is performed with a predetermined strong urging force, and
In order to perform the tip knock lightly and smoothly, it is desirable to use a predetermined weak urging force that urges the middle frame 15 forward.

Therefore.

! 11 As shown in FIG. 11, the number of turns of the third elastic body 15 is changed between the front side and the rear side, and its approximately center portion is brought into contact with the inner wall of the outer cylinder 1, so that the biasing force toward the front side is weak. It is advisable to strengthen the biasing force toward the rear side. Also, as shown in %@12, a stretchable piece 4f that tries to expand outward is formed on a part of the outer periphery of the tip tube portion 4, and due to friction with the inner wall of the outer tube 1,
A predetermined reaction force may be applied to the backward movement of the tip tube portion 4.

Further, a distance (d) is provided between the outer step portion 15b of the middle frame 15 and the stopper step portion 1a of the outer cylinder 1.

Therefore, the maximum retraction distance of the middle frame 15 is:

It is regulated up to the stopper step portion 1a.

A slider 16 that is movable in the axial direction is arranged inside the tip 2.

The slider 16 includes a slider main body 19 having a slide pipe 18 mounted in the center as shown in the first diagram, and a friction applying member installed inside the slider main body 19 to apply a predetermined frictional pressure to the core 14. 20.

The slider 16 is urged forward by a second elastic body 13 whose rear end is engaged with a receiving portion 21 fixed to the tip 2.

Here, the friction applying member 20 applies a predetermined frictional force to the core 14, and when performing the automatic core feeding operation described later, the elastic force is greater than the elastic force of the first elastic body 12 and @2. This is slightly larger than the elastic force of the elastic body 13. Moreover,
As shown in FIGS. 1 and 13, the friction applying portion 20a of the friction applying member 20 is formed in a saw blade shape inclined toward the front, and the advancing core 14 can move smoothly.

The retracting core 14 is formed so that it cannot be easily retracted due to frictional force.

Further, as a means for stopping the slider 16 for a predetermined period, an annular protrusion 21a on the inner wall of the receiving portion 21 is used as shown in the first figure.
A protrusion 19b that engages with is provided. Here, the slit S is formed on the side surface of the slider main body 19, as shown by the dotted line.

The distance (f) is the distance between the rear end of the slider 16 and the front tube 9 when the slider 16 is not retracted, as shown in FIG. This is the distance that can be written by the automatic lead feeding operation which is the second means, and corresponds to the amount of lead feeding during the lead feeding operation by the tip knock which is the first means.

Also, the distance (b) between the inner wall annular protrusion 21a and the front side of the protrusion 19b (distance at which the two engage with each other).

There is a relationship (a) > (d) > (g) between the distances f% (a), (d), and (g).

Next, the core feeding operation of this invention will be explained.

This core feeding operation can be performed in the following three ways.

+1+ First, the method @l is a normal method performed by knocking the rear end of the core pipe 3.

That is, the sleeve 7 engaged with the tip receiving portion 4.

Due to the knocking action, it moves forward together with the core pipe 3 and the like, but it comes into contact with the tip of the front tube 9 and stops. However, the tip receiving portion 4, which is integral with the core pipe 3, is further pressed forward and moves forward while passing over the inner wall of the sleeve T. Then, the rear end of the lead chuck 6 is pressed forward to perform normal lead feeding.

+21 As a second means, by interrupting writing, the lead feeding operation can be performed automatically.

That is, writing is normally performed with the lead 14 protruding a predetermined amount X from the slide pipe 17 as shown in FIG. As the writing progresses, the lead 14 gradually wears out and becomes flush with the tip of the slide pipe 18, as shown in Figure 15. Even in this state, the slider 16
can retreat rearward against the biasing force of the second elastic body 13, so that the retreat distance (f) shown in FIGS. It is possible.

By the way, the amount of wear of the lead 14 due to writing is the retreat distance (f)
It takes a very long time to write.

By the way, with normal adult pen pressure, density HB, lead diameter 0, 5
When writing a single kanji character on high-quality paper using an M mechanical pencil, the amount of wear on the lead is only about 0.01 m. Therefore, it is usually possible that continuous writing is performed until the slider 16 retreats by the retracting distance (f), and it is considered that writing is always interrupted, such as when taking a break from writing.

For example, assume that writing is interrupted in the state shown in @16 and the tip of the slide pipe 18 is removed from the paper surface.

As a result, the slider 16.

As well as moving forward due to the elastic force of the second elastic body 13,
The core 14 is also pulled in the forward direction together with the slider 16 by a predetermined friction force from the friction applying member 20. on the other hand,
The chuck tightening force of the lead chuck 6 on which the lead 14 is sprayed is applied by the elastic body 12 with a weaker gl than the second elastic body 13, so the above-mentioned tensile force of the lead 14 in the forward direction causes The lead chuck 6 is compressed to allow the entire lead chuck 6 to advance. During this forward movement, the head of the lead chuck 6 rolls into contact with the tapered inner wall 7g of the sleeve 7, and as the ball 11 moves forward, the head of the lead chuck 6
The biting force weakens and the core 14 is fed out.

Through this series of operations, the state shown in Figure 15 is returned again, the lead feeding operation is automatically performed, and writing becomes possible.
Maximum retraction distance (f) of slider 16! Continuous writing is possible.

+a+ The third means is to send out the core by knocking the tip of the slider 16 against the paper surface.

There are two cases of this tip knock: secondary, and since the effects are different, each case will be explained separately.

(a) The first tip knock is performed when the core 14 does not protrude from the tip of the slide pipe 18, as shown in Figure 15, and by knocking the tip, the distance (f) is always extended from the slide pipe 18. The first part from which the core 14 protrudes
The state shown in Figure 4 (X=(f)) is obtained.

That is, due to the tip knock, the lead chuck 6 is moved to the core 14.
At the same time, the slider 16 also moves back. The amount of retreat for both is the same amount, and the maximum retreat distance (d) in Figure 1! It is possible. In addition, middle frame 15Fi
It will be locked by the stopper step portion 1a of the outer cylinder 1.

When retracting the lead chuck 6, the distance a shown in the first diagram is
Since there is the above-mentioned add relationship between and d, the lead 14 is always held in the sprayed state, except when the rear end of the lead chuck 6 comes into contact with the tip tube part 4. Then, as the lead chuck 6 retreats, the middle frame 15 and the front tube 9 are moved rearward through the inner and elevated portions 15a and 7h against the biasing force of the third elastic body 1T.

On the other hand, upon retraction of the slider 16, the distance (a).

Between (a) and (g), (a > (d) >
Since the relationship (g) holds, the vine large retreat distance (d)
In the process of retreating, first.

After the protrusion 19b of the slider body 19 climbs over the inner wall annular portion 21a of the receiving portion 21, the rear end of the slider body 19
7, it protrudes from the rear end of the receiving part 21.

Here, a distance (f) is maintained between the rear end of the slider body 19 and the front tube 9 in the states shown in FIGS. 1 and 17.

Next, when the slider 16 is released from the surface of the paper against which it was pressed, the sleeve 7, lead chuck 6, etc., and the middle frame 15 are moved mainly by the urging force of the third elastic body 17 to the front tube 9. advances until it comes into contact with the stepped portion 2aiCW of the tip tool 2. During this forward movement, the lead chuck 6 holds the lead 14 in a sprayed state.

On the other hand, the slider 16 moves forward due to the urging force of the second elastic body 13, as shown in FIG.

It is temporarily stopped by a protrusion 19b of the slider body 19 that engages with the inner wall annular protrusion 21m. This slider 16
As described above, even when the core 1 is temporarily stopped, the core delivery mechanism 5
4, the lead 14 moves forward relative to the slider 16 until the leading tube 9 comes into contact with the rear end of the slider body 19 and releases the above-mentioned temporary stop engagement. This amount of advance is equal to distance (f).

Therefore, due to the tip knock of this gt, as shown in Fig. 14 (X
= (f)) The state shown is 9. Core 14 is slide pipe 1
The length (f) protrudes from the tip of B.

(b) Next, the second tip knock is performed in a state where 7J14 protrudes from the tip of the slide pipe 18 as shown in Figure 14.

In this case, if X≦short distance d) - distance (g) between the protrusion amount X and distance (d) - distance (b)), the length of (f) always protrudes from the slide pipe 18 A solid core is obtained.

Now, in order to make it easier to understand, we will explain by substituting concrete numerical values as an example. For example, (f) = 0.8.

(g) = 1.3 m, (d) = 1.7 t
tm, X = 0.3 vm (< (d) −(
g) = 0.4 m). When the tip is knocked in this state, first, only the lead delivery mechanism 5 and the middle frame 15 move back together with the lead 14 up to the retreat distance X. After that, @l
Similarly to the tip knock, the slider 16 moves back together with the core delivery mechanism 5 and the middle frame 15. Therefore, the amount of retraction of the lead chuck 6 with respect to the slider 16 is X = 0.3 wm
It's getting bigger. Therefore, the retractable distance of the slider 16 is determined by the inner frame 1 whose retraction amount is regulated by the stopper step 1a.
5, remaining (d) - (g) = 1.7 mm
Only -1,3■=0.4■ can be retreated. During the retreat process, it rides over the inner wall annular protrusion 21a of the receiving portion 21.

Next, when the IC slider 16 is released from the paper surface on which it was pressed, the core delivery mechanism 5
moves forward with the core 14 bitten.

On the other hand, the slider 16 is temporarily stopped by the inner wall annular protrusion 21a engaged with the protrusion 19b.

Thereafter, the core 14 protrudes from the tip of the slide pipe 18 by a length (f) in exactly the same way as the first tip knock.

On the other hand, when X>(d)-□□□)=0.4-, the slider 16 can be engaged with the inner wall annular protrusion 21a by the middle frame 15 whose rear end is regulated by the stopper step 1a. cannot retreat until Therefore, a situation in which the slider 16 engages with the protrusion 21a of the receiving portion 21 and is temporarily stopped cannot occur, so the A adjustment of the protrusion amount as described above is not performed. In other words, no matter how many times the tip is knocked, the tip knock without core feeding is simply being returned, so the core 14 will always protrude at the same protrusion amount X. .

〔Effect of the invention〕

As described above, according to the present invention, the lead chuck is tightened by the sleeve, the sleeve is biased and supported forward by the middle frame, and the slider is locked at a predetermined time by the front barrel, so that the internal structure is improved. It can be simplified, and the core feeding operation can be reduced to 3 times.
You can do it the same way.

Furthermore, in the core feeding operation using the knock at the tip, it is of course possible if the core does not protrude, but on the other hand, if the core does not protrude beyond the specified amount.

Even if there is excessive protrusion, a constant amount of protrusion can always be obtained.

[Brief explanation of drawings]

Fig. 1 is a longitudinal cross-sectional view of an embodiment of the present invention, Fig. 2 is a longitudinal cross-sectional view of the engagement between the sleeve and the tip tube, Fig. 3 is a partial side view of the lead chuck, and Fig. 4 is an open view. Plan view, Figure 5 is W
6 is a sectional view taken along the line Y-X of FIG. The figure is a plan view of another embodiment of the tooth section, and FIG. 10 is a longitudinal cross-sectional view of another embodiment of the lead chuck and tip tube section.
FIG. 11 is a longitudinal sectional view of the third elastic body for the cushion. FIG. 12 is a front view of another embodiment of the tip tube portion, FIG. 13 is a sectional view of the friction imparting member, and FIGS. 14 to 11E17 are explanatory diagrams of the core feeding operation. 1 is the outer cylinder, 3 is the core pipe, 6 is the lead chuck, T is the sleeve, 9 is the tip tube, 15 is the middle frame, and 16 is the slider.

Claims (1)

[Claims] A core pipe (3) is housed inside the outer cylinder (1) so as to be slidable in the axial direction, and a core pipe (3) is arranged at the distal end of the core pipe (3) to allow the core (14) to move forward, but not to retreat. A lead chuck (6) for attaching a core to prevent it, and this lead chuck (6)
The sleeve (7) fitted on the head of the
) and the lead chuck (6), a chuck tightening elastic body (12), a cushioning elastic body (17) that urges the sleeve (7) forward, and the lead chuck (6). It is slidably arranged on the tip side of the lead chuck (6),
Elastic body (13) with a larger elasticity coefficient than the elastic body (12)
), the slider (16) is biased forward by the slider (16);
A mechanical pencil comprising a tip tube (9) attached to the middle frame (15).