JPH0371995B2 - - Google Patents

Description

[Detailed Description of the Invention] <Technical Field> The present invention provides a method for pressing the tip against the writing surface with writing pressure or a slightly stronger force while holding the main body in the writing position when the lead wears out during writing. Regarding a writing instrument in which the lead can be fed out to a fixed length by releasing the pressing force, more specifically, when pressing force is applied to the lead, the slider and chuck mechanism are moved together through the lead as the lead retreats. When retracting, the retraction of the slider is made larger than the retraction of the chuck mechanism, and when the pressing force is released, that is, when the writing tip is pulled away from the paper surface, the slider and chuck mechanism are returned to their original positions. This is an image of an automatic drafting machine in which the return distance of a slider with a lead-carrying member inside is made larger than the return distance of the chuck mechanism, and the lead is pulled out from the chuck body of the chuck mechanism by expanding the slider and performing centering. This invention relates to a sharp pencil that can be used for continuous writing and can also be used as a line head.

<Background technology> The slider and the chuck mechanism are moved back a predetermined distance via the core, and both return to their original positions when the pressing force is released. At this time, the slider is temporarily locked in the retreated position. A sharpening pencil in which centering is performed by returning the chuck mechanism during that time and then returning the slider is generally called a tip-knock type, and is disclosed, for example, in Japanese Patent Application Laid-open No. 14099/1983 by the applicant of the present application. .
With this structure, it is necessary to shift the timing of the advance of the slider and the advance of the chuck mechanism, and for this purpose an O-ring supported on the inner wall of the shaft cylinder is used as a temporary locking means for the slider. There was room for improvement in reliability and durability.

In addition to the above-mentioned structure in which the slider and the chuck mechanism have the same amount of retraction and centering is performed by relatively staggering the return times of both, there is a slider that is mounted on a cylindrical inner frame equipped with a chuck mechanism. The inner frame holds a ball that can move in the radial direction, and the outer peripheral surface of the slider, which is in contact with the ball, is arranged so that the slider can move back and forth with respect to the inner frame as the ball moves. JP-A-57-189898 discloses a structure in which a tapered portion is formed. However, this structure has the following operational concerns.

That is, although centering is performed by changing the amount of return of the middle frame and slider when the writing pressure is released, it is extremely difficult to do so with a small amount of retraction, and the timing is very difficult. If it is taken incorrectly, there is a risk that it will not work, and since it is necessary to apply writing pressure and move the inner frame back significantly, it is difficult to center the pen smoothly while writing.

<Disclosure of the Invention> The object of the present invention is to eliminate the above-mentioned drawbacks of the conventional sharpening pencil, reduce the play of related members until the centering operation, allow reliable protrusion of the lead, and enable centering while writing. To provide an improved sharp pencil capable of centering with writing pressure or a slightly stronger pressing force without performing a special knocking operation while maintaining a writing posture.

Briefly, the sharp pencil of the present invention has a slider that is equipped with a lead-carrying member and is elastically biased forward, and is disposed in such a way that it can be freely pushed into the shaft cylinder, and the lead is allowed to advance behind the slider. A ball chuck mechanism including a chuck body and a chuck mechanism is provided to prevent the lead from retreating, and by applying a pressing force to the writing tip, the slider and the ball chuck mechanism are retracted, and when the pressing force is released, the slider and the ball chuck mechanism are In a sharp pencil that is moved forward for centering, there is provided an actuating body mantle that moves with the movement of the chuck actuating body and is elastically biased forward, and in front of the actuating body mantle, there is provided an actuating body mantle that cooperates with the actuating body mantle. At the same time, the slider can be moved backward by engaging with the slider, and the oscillator is elastically biased rearward and is tiltably held by an oscillator holder whose one end is fixed in the shaft cylinder. It has a set configuration. With this configuration,
When the chuck actuating body retreats due to the reaction force of the writing pressure through the lead, the oscillator tilts to make the moving distance of the slider larger than the moving distance of the chuck body, and the centering is performed by the difference in the moving distance. It was designed to do this.

<BEST MODE FOR CARRYING OUT THE INVENTION> The specific structure of the sharpening pencil according to the present invention will be described with reference to FIG. A rear shaft 1c, which holds a core tank 3 so as to be movable back and forth, is attached to a joint part 2 to a front cylinder part 1b, which has a tip 1a having a conical outer shape engaged with the front end.
They are screwed together so that they can be tensioned freely to form a shaft tube 1 that becomes the pencil body. Inside the shaft cylinder is the core tank 3.
In addition, a slider 5 equipped with a core guide tube 4 protruding from the tip 1a, a slider retracting means 10 that can engage with the slider and retract the slider as the chuck operating body retracts, and a chuck body. A chuck mechanism 9 having a chuck actuator 6 and a chuck actuating body 7 to allow the core to move forward but prevent it from retreating is arranged as follows.

First, a cylindrical slider 5 with a core guide tube 4 connected thereto is connected to an oscillator holder 1 fixed in a shaft tube 1, which will be described later.
It is biased forward by a tip spring 20 whose rear end is fixed to 5, and has a core-carrying member 11 that grips the core with a moderate frictional force, and an outer protrusion 5 at the rear end.
It has a rear protruding portion 5a having a shape b, so that it can be engaged with an oscillator 16, which will be described later. The tip spring 20 is formed so that its elastic force is smaller than the core friction gripping force of the core entraining member.

The slider retraction means 10 is composed of:
Mainly, the actuator mantle 12 is moved backward as the chuck actuator 7 retreats, and is normally urged forward by the writing pressure corresponding spring 30, and the actuator mantle 12 is urged backward by the spring 13 as the actuator mantle 12 retreats. The oscillator pressing member 14 that moves backward, the oscillator holder 15 fixed to the inner surface of the tip 1a, and the holder 15
This is an oscillator 16 which is swingably held by the oscillator 16 and tilts when the oscillator pressing member 14 retreats, thereby causing the slider 5 to expand and retreat.

As mentioned above, the actuator mantle 12 is disposed outside the chuck actuator 7 so as to be able to move back and forth, and its front end comes into contact with the rear end of the rocker pressing member 14. a surface 17, an inner shoulder 18 that engages with the protrusion 7a of the chuck actuating body 7, an outer shoulder 21 that contacts the step 19 of the barrel 1, and a spring that supports the front end of the writing pressure corresponding spring 30. Support surface 22
When the chuck actuating body 7 retreats, it can retreat against the elastic force of the spring 30 corresponding to the writing pressure.

The front end surface 17 of the actuator mantle 12 is an oscillator pressing member 14 whose rear end is in contact with the spring 13.
As shown in FIG. 5, the oscillator 16 is provided with a slit 31 that allows the oscillator 16 to swing rearward and return it to its original upright position by advancing the pressing member 14. A front cylindrical portion 2 in which a spring 13 is interposed between the cylindrical portion 23 and the rocker holder 15.
4. Here, the writing pressure compatible spring 30
The elastic force of is larger than the elastic force of the spring 13 which urges the rocker pressing member 14 rearward, and the difference between the two varies depending on the position of the rear cylinder part 1c with respect to the front cylinder part 1b. This force is set in the range of ~350g, and this force corresponds to the force that the lead receives from the paper surface when writing.

A cylindrical rocker holder 15 in which the rocker pressing member 14 is movably moved back and forth has a notch 32 that holds the rocker 16 in a tiltable manner, and a cutout 32 that communicates with the notch 32 and is partially cut out. and has a C-shaped tip 33,
This prevents the rocker 16 from moving backward, and also serves as a fulcrum during tilting.

The rocker 16, which is tiltably held by the holder 15, has a head 34 that is longer than the width of the notch 32 of the holder 15, a neck 35 held by the notch 32, and a A semicircular leg portion 36 that substantially corresponds to the inner surface shape of the rear cylindrical portion 23 of the member 14 and can be engaged with the rear end flange 5b of the slider 5 is integrally formed.

A chuck mechanism 9 is provided behind the slider 5 and is movable in the axial direction. The configuration of the chuck mechanism itself may be a ball chuck structure similar to the conventional one, and includes a chuck body 6 and a chuck operating body 7, which exhibit a wedge action through cooperation between the trochanter 37 and the inclined surface 38, and the rear end of the chuck body 6 and the chuck operating body. Any type of conventionally known type can be used as long as it has a structure in which the opening of the chuck body 6 is normally closed by the above-mentioned wedge action by the spring 25 stretched between the chuck body 7 and the chuck body 6 to prevent the core from retreating. It's fine. In the illustrated example, the chuck body has two separate chuck pieces disposed opposite each other and held by a rubber ring 39 at the rear end, so that the chuck body 6 has a self-opening force. A pusher 40 connected to the core tank 3 is loosely fitted to the rear of the chuck operating body 7, and a rear end knock type centering can be performed by operating a knock cap 41 integrally connected to the core tank 3. There is. If the pusher 40 is fitted onto the chuck actuating body 7 with an appropriate frictional force, the spring 29 tensioned between the actuating body mantle 12 and the chuck actuating body 7 is not necessary. In FIG. 1, reference numeral 42 is a friction locking ring provided on the outer surface of the slider 5, which holds the lead guide tube 4 in the barrel 1 when carrying the pencil body in a pocket or the like. It is for.

Next, the operation of the sharpening pencil according to the present invention will be explained with reference to FIGS. 1 to 4.

FIG. 1 shows a state in which the lead L protrudes from the lead guide tube 4 and is ready for writing. In this state, the slider 5 is urged forward by the elastic force of the tip spring 20. Also, the chuck body 6 is a chuck operating body 7.
Since the chuck body 6 and the chuck actuating body 7 are urged backward by the chuck spring 25 inside, a wedge action is exerted between the chuck body 6 and the chuck actuating body 7 via the trochanter 37, and the chuck body 6
is in a state of biting the core, and a relationship has been established that allows the core to move forward but prevents it from retreating. At the same time, the chuck actuating body 7 is pushed against the inner shoulder 18 of the actuating body mantle 12 by the spring 29, and the actuating body mantle 12 is pressed against the stepped part 19 of the barrel 1 by the elastic force of the spring 30 corresponding to the writing pressure. It is being In this state, the oscillator 16 is suspended from the oscillator holder 15, and the oscillator pressing member 14 that cooperates with the oscillator 16 is supported by a spring that urges the pressing member 14 backward. 1
The oscillator 16 is freely suspended from the oscillator holder 15 because it is pressed forward by the rear end surface 17 of the actuator mantle 12 through the writing pressure corresponding spring 30 having a force stronger than 3.

FIG. 2 shows the writing state. When the writing state shown in FIG. 2 is entered from the state shown in FIG. 1, the reaction force of the writing pressure causes the operating body mantle 12 to retreat through the lead L, the chuck body 6, and the chuck operating body 7. Due to the retreat of the actuator mantle 12, the actuator mantle 1
The oscillator pressing member 1 which was press-fitted with the front end surface 17 of 2
4 also moves rearward by the same amount as the retreat of the actuating body mantle 12 due to the elastic force of the spring 13. At this time, the head 34 (FIG. 5) of the oscillator 16 is attached to the tip 33 of the oscillator holder 15.
Since the movement of the oscillator pressing member 1 is restricted by
The rotational force is received by the end of the slit 31 of No. 4. In FIG. 2, symbols A, B, and C represent a fulcrum, a point of force, and a point of action, respectively, when rotating the rocker 16. Oscillator 1
6 rotates, the rear end flange 5b of the slider 5
is pushed backward, and the slider 5 is moved backward by the amount of rotation, overcoming the elastic force of the tip spring 20 and the frictional locking force with the core L of the core entraining member 11. That is, the slider 5 receives a force from the rocker 16 that is stronger than the frictional locking force against the core of the internally disposed core entraining member 11, and moves backward by a distance 1. The amount of movement is the amount of retraction 2 of the actuator mantle 12 multiplied by AC/AB, and the centering length at this time is the amount obtained by subtracting the retraction distance of the actuator mantle from the retraction distance of the slider, that is, 1 -2.

FIG. 3 shows the state at the moment when the writing pressure is released and the writing tip is removed from the paper surface P. In this figure, until the writing pressure is released and the lead L separates from the paper surface, the actuator mantle 12 moves forward and the stepped portion 19 of the barrel 1 is moved forward.
It stops when it comes into contact with. At this time, the front end surface 17 of the actuating body mantle 12 presses the oscillator pressing member 14 to return it to its original position, and the oscillator 16 is released from the rotational force of the oscillator pressing member 14, so it is suspended freely. become a state. Here, the slider 5 tries to return to its original state due to the elastic force of the tip spring 20, but in this state, the core gripping force of the chuck body 6 still exists, and the elastic force of the tip spring 20 Since the core friction locking force of the core entraining member 11 is larger than that of
The positional relationship shown in the illustration will continue to be maintained unless the writing pressure is completely released.

In FIG. 4, which shows the state in which the writing pressure is completely released, when the writing tip is completely pulled away from the paper surface P,
The core gripping force of the chuck body 6 is lost, and the chuck body 6
is in a state that allows the core to advance. At the same time, the elastic force of the tip spring 20 overcomes the lead gripping force of the chuck 6, and the slider 5 advances until it abuts against the inner wall of the tip 1a while gripping the lead with its lead-carrying member 11. In this way, the necessary centering has been achieved.

In the above, when the lead already protruding from the lead guide tube 4 is worn out due to writing, centering can be performed by pressing the lead against the paper surface while maintaining the writing posture, applying a pressing force to the lead, and releasing the pressing force. This is the operation when performing. Centering using the normal rear end notch, such as the initial centering operation, is similar to that disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 14099/1982, but will be briefly explained below.

First, when the chuck body 6 is opened, the lead supplied from the lead tank 3, which is stopped on the inner surface of the closed chuck body 6, freely falls to the lead-carrying member 11 of the slider 5. The core must be fed by overcoming wear resistance. To do this, just like a normal rear-end notch type sharp pencil, push and release the notch cap 41 fitted to the rear end of the lead tank 3 with your fingertips. That is, the frictional resistance pusher 40 integrated with the core tank 3 is connected to the chuck actuating body 7 with relatively strong sliding frictional resistance, or the pusher 40
During the forward movement of the chuck actuator 7, the rear step portion 7b of the chuck actuator 7 generates frictional resistance between the chuck actuator 7 and the pusher 40 to connect them. In this case, as already mentioned, the spring 29 is stretched between the chuck actuating body 14 and the actuating body mantle 12, and the chuck actuating body 7 is attached to the actuating body mantle 12 on the outside. Since it is slidable, if the lead tank 3 is advanced against the writing pressure corresponding spring 30, the chuck mechanism 9
The actuator also moves forward, and its front end comes into contact with the back surface of the front end surface 17 of the actuating body mantle 12, preventing further advancement. When the core tank 3 is further advanced thereafter, the leading end surface of the core tank presses the rear end surface of the chuck body 6 and compresses the spring 25 tensioned on the chuck mechanism, thereby moving only the chuck forward. As a result, the trochanter 37 of the chuck mechanism 9 is forced into the widening portion of the tapered guide surface 38 of the chuck operating body 7, and the opening of the chuck body 6 is expanded by the self-expanding force of the rubber ring 39. .

Next, the pressing force applied to the chuck cap 41 is released and the restoring force of the compression spring 30 returns it to its original state, but since the chuck actuating body 7 is connected to the frictional resistance pusher 40 by frictional resistance. With the mouth of the chuck body 6 kept open, the protrusion 7a of the chuck actuating body 7 is pushed back until it touches the inner shoulder 18 of the actuating body mantle 12, and when it returns, it grips the core firmly again. In this way, as the lead tank 3 moves forward, the lead L is moved forward by overcoming the resistance of the lead carrying member 11 of the slider 5, and when the lead tank moves back, it moves back with the mouth of the chuck body 6 open, and when the lead tank 3 is moved back, the lead L is moved forward. Since the lead L will be clamped again at the point where the center ends, the desired centering can be achieved by repeatedly operating the knock cap 41.

6 and 7 show a modification of the slider retraction means 10 according to the present invention, showing the rigid oscillator 16 in the embodiment shown in FIG. 1 and the oscillator pressing member 14 that presses it backward. Instead of the spring 13, an elastic oscillator 116 with a self-resilient force is attached to the oscillator holder 115, and is brought into elastic contact with the tip 117 of the actuating body mantle 12. Due to the retreat, the actuator mantle 12 is moved backward, and the oscillator 116, which had been elastically pressed against the tip 117 of the actuator mantle 12, uses its own elastic force to move the slider 5 backward against the tip spring 20. Move and enlarge. The other configurations and operations are substantially the same as those of the embodiment shown in FIGS. 1 to 5, and therefore their explanation will be omitted.

In either embodiment, the chuck mechanism 9 moves backward due to writing pressure, but in order to cope with individual differences in writing pressure, the front cylinder part 1b and the rear cylinder part are screwed together at the joint part 2 as described above. By adjusting the relative position with the portion 1c, the elastic force of the writing spring 30 can be changed and centering adjustment can be performed.

Since the sharp pencil of the present invention has the above-mentioned structure, the slider can be moved to the maximum extent with the minimum movement of the chuck mechanism, so that the centering operation can be performed extremely smoothly and reliably by simply applying writing pressure or a slightly larger force. It has the advantage of being able to
It can be used not only as a normal sharp pencil but also as a drawing head for an automatic drafting machine.

[Brief explanation of drawings]

1 to 4 are longitudinal cross-sectional views of a sharpening pencil according to a first embodiment of the present invention, in which FIG. 1 shows the state before writing, and FIG. Figure 3 is a diagram showing the state at the moment when the writing pressure is released and the lead is released from the paper surface.
Fig. 4 is a diagram showing a state in which the writing pressure has been completely released, the chuck mechanism and slider have returned, and centering has been performed, and Fig. 5 is a perspective view of the oscillator and its related members in the first embodiment. , FIG. 6, and FIG. 7 are diagrams showing another embodiment of the present invention. 4...Core guide tube, 5...Slider, 6...Chuck body, 7...Chuck operating body, 9...Chuck mechanism, 11... Core entraining member, 12... Operating body jacket, 13... Spring, 14... Rocker pressing member, 1
5,115... Rocker holder, 16,116...
Oscillator, 20...Tip spring, 30...Writing pressure compatible spring.

Claims (1)

[Scope of Claims] 1. A slider equipped with a core-carrying member and elastically biased forward is arranged so as to be freely pushed into the shaft cylinder, and behind the slider is a slider that allows the core to move forward but prevents the core from retreating. A ball chuck mechanism including a chuck body and a chuck operating body is provided, and by applying a pressing force to the tip of the writing instrument or lead, the slider and ball chuck mechanism are retracted, and when the pressing force is released, the slider and ball chuck mechanism are retracted. In the sharp pencil that performs centering by advancing the chuck, an actuating body mantle is provided which moves with the movement of the chuck actuating body and is elastically biased forward, and in front of the actuating body mantle there is a member that cooperates with the actuating body mantle. a tiltable oscillator which is held by an oscillator holder having one end fixed in the shaft cylinder and is elastically biased rearward; is provided, and when the chuck operating body retreats due to the reaction force of the writing pressure through the lead, the oscillator tilts to make the moving distance of the slider larger than the moving distance of the chuck body, and the difference in the moving distance is A sharpening pencil that allows for centering. 2. The oscillator is urged backward by a spring stretched between the oscillator holder and elastically pushed backward by an oscillator pressing member whose rear end is disposed opposite to the operating body mantle. A sharpening pencil according to claim 1 which is energized. 3. The sharp pencil according to claim 1, wherein the oscillator is an elastic oscillator having a self-resilient force and elastically pressed onto the front end of the actuating body mantle. 4. The shaft cylinder has a front cylinder part and a rear cylinder part which are screwed together in an adjustable manner, and by changing the relative position of the front cylinder part and the rear cylinder part, the actuating body mantle is urged forward. 2. A sharpening pencil according to claim 1, wherein the resiliency of the spring can be changed.