TW201529357A - Writing tool - Google Patents

Abstract

The present invention provides a writing tool for effectively protecting the front side part of a writing core that is projected from the front end of an axial cylinder. The writing tool of the present invention comprises: an axial cylinder (10); a pen clip (20) inserted into a front side opening part (11a) of the axial cylinder (10) and projected forward from the front end of the axial cylinder (10); and a writing core (30) inserted into the pen clip (20) for contacting the inner circumferential surface of the pen clip (20), and supported on the axial cylinder (10) in a manner of projecting forward from the front end of the pen clip (20), wherein there is a movement direction conversion mechanism provided between the axial cylinder (10) and pen clip (20). The movement direction conversion mechanism enables the pen clip (20) to move forward relative to the axial cylinder and the writing core by means of the force applied to an outer radial direction of the axial cylinder of the pen clip (20).

Description

Writing instrument

The present invention relates to a writing instrument in which a writing portion protrudes from a front end of a barrel, such as a mechanical pencil and a ballpoint pen, a signature pen, a marker pen, a correction pen, and the like.

Conventionally, as described in Patent Document 1, the invention includes a mechanical pencil including a barrel (40), a clip (slider 10) inserted through a front opening of the barrel (40), and Projecting forward from the front end of the barrel (40); and writing core (spin-out mechanism 20 and core reservoir 22, etc.), inserting the clip (slider 10), and passing the lead (1) from the The front end of the pen holder (slider 10) protrudes forward.

Generally, in the above-described mechanical pencil, the bobbin (40) is held in a state of being inclined at an appropriate angle, and the lead (1) protruding from the above-described pen holder (slider 10) is pressed against the paper surface for writing.

Therefore, by applying an axial pressing force to the lead core (1) and a pressing force in a direction crossing the axial direction, the lead core (1) may be broken by the aforementioned pressing force.

Moreover, as described above, it is also possible to produce the front side of the writing core protruding from the pen holder not only in the automatic pencil but also in the ballpoint pen (especially the needle tip ball pen which is elongated at the tip end) and the signature pen, the marker pen, the correction pen, and the like. The problem of damage (such as lead core, etc.).

Patent Document 1: Japanese Patent Publication No. 2003-11582

The present invention has been made in view of the above-described circumstances, and an object thereof is to provide a writing instrument capable of effectively protecting a front side portion of a writing core protruding from a front end of a barrel.

One means for solving the above problem is a writing instrument comprising: a barrel; a pen holder inserted through a front opening of the barrel and protruding forward from a front end of the barrel; and a writing core and the pen The inner peripheral surface of the clip is in contact with and inserted into the clip, and is supported by the shaft barrel so as to protrude forward from the front end of the clip, wherein a movement direction changing mechanism is provided between the barrel and the clip, The movement direction changing mechanism advances the pen holder with respect to the barrel and the writing core by a force applied to an outer direction of the barrel diameter of the pen holder.

Since the present invention is constructed as described above, it is possible to effectively protect the front side portion of the writing core which protrudes from the front end of the barrel.

1, 2, 3, 4, 5‧‧‧ writing instruments

10, 10', 10" ‧ ‧ shaft

11c‧‧ Section

11a‧‧‧ front opening

13‧‧‧Clamping force member

20, 20’, 20”, 60‧‧‧ pen holders

20a, 11a’, 21”‧‧‧ cam slope

21‧‧‧Spring Acceptance Department

30‧‧‧ writing core

31‧‧‧ lead core

32‧‧‧ lead screw unwinding mechanism

32a‧‧ core storage

32b‧‧‧ chuck

32c‧‧‧Clutch ring

32d‧‧‧core interrupter

32e‧‧ ‧ slide

32e1‧‧‧ expansion section

32e2‧‧‧ core powder drain

32f‧‧  slide force member

32g‧‧‧retention tube

32g1‧‧‧ Front Side Holder

32g2‧‧‧ rear side holding unit

32g12‧‧‧ front side abutment

32g20‧‧‧writing core support

32g22‧‧‧Apartment

32h‧‧‧ core reservoir force member

33‧‧‧ cushioning parts

40‧‧‧Advance and retreat components

50‧‧‧ writing core force component

Fig. 1 is a cross-sectional view showing an example of a writing instrument of the present invention.

Figure 2 is an enlarged perspective view of the main part of the writing instrument.

Fig. 3 is a half cross-sectional view showing an example of a slider.

Fig. 4 is a view of the slider viewed from the front.

Fig. 5 is a half cross-sectional view showing a state in which the writing core is removed from the pen holder.

Fig. 6(a1) is an end view taken along line (a1)-(a1) in Fig. 5, and Fig. 6(a2) is an end view taken along line (a2)-(a2) in Fig. 5.

Fig. 7 is a plan view showing the engagement relationship between the advancing and retracting members and the barrel.

Fig. 8 is an enlarged cross-sectional view of the front end side of the writing instrument, Fig. 8(a) shows a normal writing state, and Fig. 8(b) shows a state in which the pen holder advances. In addition, in the figure, only relative to Figure 8 (a) The moving part is hatched to show Figure 8 (b).

Fig. 9 is an overall sectional view showing the state in which the pen holder advances with respect to the writing instrument.

Fig. 10 is a cross-sectional view showing the main part of the writing instrument. Fig. 10(a) shows a normal state, and Fig. 10(b) shows a state in which the writing core is pressed backward. Further, in the figure, only the portion moved with respect to Fig. 10(a) is hatched to be shown in Fig. 10(b).

Fig. 11 (a) to (c) are cross-sectional views showing a modified example of the cam slope.

Fig. 12 is a front end side enlarged cross-sectional view showing another example of the writing instrument of the present invention, wherein Fig. 12(a) shows a normal writing state, and Fig. 12(b) shows a state in which the pen holder advances. Further, in the figure, only the portion moved with respect to Fig. 12(a) is hatched to be shown in Fig. 12(b).

Figure 13 is a cross-sectional view showing the main part of another example of the writing instrument of the present invention.

Figure 14 is a cross-sectional view showing the main part of another example of the writing instrument of the present invention.

Fig. 15 is a cross-sectional view showing the main part of another example of the writing instrument of the present invention.

Fig. 16 is a perspective view showing another example of the pen holder.

A first feature of the present embodiment is as follows: a writing instrument comprising: a barrel; a pen holder inserted through a front opening of the barrel and protruding forward from a front end of the barrel; and a writing core, and The inner peripheral surface of the clip is inserted into and inserted into the clip, and is supported by the shaft barrel so as to protrude forward from the front end of the clip, wherein a movement direction changing mechanism is provided between the barrel and the clip The movement direction changing mechanism advances the pen holder with respect to the barrel and the writing core by a force applied to an outer direction of the barrel diameter of the pen holder (refer to FIG. 8).

According to this configuration, the force in the outer direction of the outer diameter of the cylinder is applied to the writing core by a pen press or the like from the pen holder In the part, if the force is applied to the clip, the clip advances relative to the barrel and the writing core, covering the front side of the writing core for protection. Therefore, damage or the like of the writing core can be prevented.

As described above, the invention having the above-described features has the gist of the conventional art, that is, the front side portion of the writing core is effectively protected by the pen holder that is advanced by the writing pressure.

Further, as a specific example of the "moving direction changing mechanism", a cam slope (inclined surface) is used to convert the movement of the outer diameter direction of the pen holder into a movement direction of the barrel, and The link member is used to convert the motion of the outer direction of the barrel of the aforementioned clip to the motion of the direction in which the barrel advances.

Further, as a specific example of the "writing core", a writing core for a mechanical pencil that inserts a lead core into a pen holder and protrudes forward from a tip end of the pen holder (sometimes referred to as a refill for a pencil) a ballpoint pen writing core (replacement for a ballpoint pen) that is inserted into the pen holder from the tip end of the pen holder, inserted into the pen holder, and the writing portion is forward from the front end of the pen holder Highlight the core of the pen or marker or the writing core of the pen.

Further, the means for returning the clip to the initial position during advancement is not particularly limited, and for example, the grip member may be provided to bias the clip to the rear with respect to the barrel; And a lever member connected to the aforementioned clip and exposed to the outside of the barrel, by manual operation of the lever member to return the clip to an initial position or the like.

According to a second feature, in addition to the first feature described above, the motion direction changing mechanism is configured to provide a cam slope on at least one of the barrel and the clip, and to advance and retract the clip via the cam slope The ground is engaged with the shaft cylinder, and the cam slope is inclined such that the force is applied to the outer direction of the shaft diameter of the clip, and the clip is advanced by sliding with respect to the other one of the ones.

According to this configuration, the force of the outer diameter of the shaft is applied to the writing core protruding forward from the pen holder, and when the force is applied to the pen holder, the cam inclined surface is slidably coupled to the other one of the ones, so that the pen holder is Advance with respect to the writing core.

Further, in the configuration of "providing a cam slope on at least one of the barrel and the clip, and engaging the clip with the cam slope to be retractably engaged with the barrel", the outer circumference of the clip is included The face is provided with a cam inclined surface that expands toward the front, and the clip is retractably engaged with the front opening of the barrel via the cam slope (refer to FIG. 8); the front opening of the barrel is disposed toward the front Expanding the cam slope and allowing the pen holder to retractably engage the front opening of the barrel via the cam slope (refer to FIG. 12); and providing a rearward extension at the rear end of the pen holder The cam slope of the diameter is such that the clip is retractably engaged with the front end edge of the barrel via the cam slope (see Fig. 13).

Further, the "cam slope" includes a linear inclined surface (see Fig. 8), a convex curved surface (see Fig. 11(a)), and a concave curved surface (see Fig. 11 (b). )) and intermittent slopes (see Figure 11 (c)).

According to a third aspect of the present invention, in addition to the second aspect, the cam slope is provided on at least one of an outer circumferential surface of the clip and a front opening of the barrel, and is opposite to the front surface of the barrel. The pen holder is advanced by sliding on the other of the ones.

According to a fourth feature, in addition to any one of the first to third features described above, the pen holder is provided to advance and retreat with respect to the shaft barrel and the writing core before and after the forward movement. Between the initial positions, and in the initial position, the front side opening portion of the barrel is not movably moved in the radial direction of the barrel, and in the forward position, The front side opening is fitted in a state of having a play in the radial direction of the barrel.

As a fifth feature, in addition to any one of the above-described first to fourth features, the pen urging member is provided to bias the pen holder rearward with respect to the barrel.

According to this configuration, when the force in the intersecting direction of the writing core is released, the pen holder can be automatically retracted by the urging force of the pen urging member.

As a sixth feature, in addition to any one of the above first to fifth features, the writing core is supported to be radially rotatable relative to the barrel relative to the barrel at a rear side of the pen holder Jog.

According to a seventh aspect, in addition to any one of the first to sixth features described above, the invention further includes: a segment portion having a segment portion for reducing a front side diameter; and a writing core supporting the inclined surface at a ratio of the segment The portion further increases in diameter toward the front side, and the writing core supporting portion is disposed between the segment portion and the writing core supporting inclined surface in the barrel, and is capable of being slightly moved in the radial direction of the rear and the barrel.

As an eighth feature, in addition to any one of the above first to seventh features, the writing core is a mechanical pencil having a lead core and a lead screw unwinding mechanism that can revolvely hold the lead core A writing core is supported in the barrel by inserting the lead core that is unscrewed into the pen holder.

Here, the aforementioned "writing core for a mechanical pencil" can be applied to: a structure in which a lead core is unscrewed by an ejection operation; a configuration in which a lead core is unscrewed by a rotating operation; and the operation of the writing tool is rotated by shaking The structure of the lead core; and the well-known construction of a writing core for a mechanical pencil (replacement for a mechanical pencil). In addition, the aforementioned "writing core for a mechanical pencil" further includes a protrusion that is made by a pen pressure A writing core for a pencil for a mechanism in which a lead core rotates, and a writing core for a pencil having a mechanism for rotating a protruding lead by a button operation or the like.

According to the above configuration, when a force in the intersecting direction is applied to the lead core in a state where the lead core is protruded forward from the pen holder, the lead core can be covered and protected by the forward pen holder.

According to a ninth feature, in addition to the eighth feature described above, the lead screw unwinding mechanism includes: a core reservoir having a lead core built therein and held in advance and retreat in the barrel; the chuck; The front end of the core reservoir is connected and clamped to the lead core; the clutch ring is fitted to the chuck in a manner to be detached to the rear side; the core breaker is elastically held on the front side of the clutch ring; the retaining cylinder The core chuck and the clutch ring are built in and out, and the core breaker is built in, and the core reservoir biasing member is biased toward the rear of the core reservoir with respect to the retaining cylinder. The holding cylinder is provided with a rear side abutting portion that receives the clutch ring from the rear side, and a front side abutting portion that receives the clutch ring when moving forward from the front side.

In addition to the ninth feature, the tenth feature is characterized in that the pen holder is fitted to the front end side of the holding cylinder so as to be retractable.

According to this configuration, the forward and backward movement of the pen holder can be performed more smoothly.

According to an eleventh feature, in addition to the ninth or tenth feature described above, the present invention includes: a slider that is located between the chuck and the core breaker, and that can advance and retreat in a state in which a lead core is inserted And a slider biasing member that urges the slider toward the rear with respect to the retaining cylinder.

According to this configuration, for example, the state in which the lead core that is broken between the chuck and the core breaker can be blocked can be prevented by the slider interposed therebetween.

As a twelfth feature, in addition to any of the above first to eleventh features, Further, the writing core is provided with a writing core biasing member that biases the writing core forward with respect to the shaft cylinder, and the writing core resists the aforementioned force by a predetermined rear pressure or more The writing force of the core applying member retreats.

According to this configuration, when an excessive pressing force toward the rear is applied to the writing core, the writing core and the advancing and retracting member are retracted against the urging force of the writing core urging member. Thereby, it is possible to prevent the writing core from being damaged.

Further, in the embodiment to be described later, an independent invention that does not include a part of the above-described features and only the following constituent elements are required as an essential component is also disclosed.

That is, the independent invention is a lead screw unwinding mechanism having a chuck that advances and releases the clamped lead core, and a core interrupter that remains away from the chuck toward the front Inserting a lead core of the chuck, and rotating the lead core to the front of the core breaker by clamping and releasing and advancing and retracting movement of the chuck, wherein the chuck is disposed on the chuck and the core a sliding cylinder that advances and retracts between the interrupters in a state of covering the outer circumference of the lead core, and a biasing member that urges the sliding cylinder toward the rear with respect to the core breaker, so that the chuck and the sliding cylinder integrally advance and retreat And a core powder discharge groove penetrating in the axial direction is provided on an outer circumferential surface of the sliding cylinder.

According to this configuration, it is possible to prevent the lead core between the chuck and the core breaker from being broken by the falling impact or the like by the sliding cylinder, and the sliding of the sliding cylinder by the core powder discharge groove in the axial direction of the sliding cylinder Since the core powder is generated, it is possible to prevent the core powder from being fixed around the slider and causing malfunction.

Further, in the following-described embodiments, an independent invention in which only a part of the above-described features is not included and only the following constituent elements are required is disclosed.

That is, the writing instrument of the independent invention includes: a barrel: a clip inserted through the front opening of the barrel and protruding forward from the front end of the barrel; and a writing core, and the writing clip The inner peripheral surface is in contact with and inserted into the pen holder, and the support protrudes forward from the front end of the pen holder, and the writing instrument is configured to advance and retreat the pen holder relative to the shaft barrel, wherein the writing instrument is provided with a buffer The cushion member is elastically deformed by receiving the pen holder at the time of retreating.

According to this configuration, when the pen holder is retracted, the pen holder is received by the cushioning member, and the cushion member is elastically deformed. Therefore, the clip at the time of retracting can alleviate the operation sound and the like when abutting against the shaft-side member.

[Examples]

Next, a preferred embodiment having the above features will be described in detail based on the drawings.

In addition, in the present specification, the axial direction of the barrel refers to the direction in which the center line of the barrel extends. Further, "front" refers to one side of the axial direction of the cylinder and the front end direction of the writing portion. Further, "rear" means the opposite side to the aforementioned side with respect to the axial direction of the barrel. Also, "cylinder radial direction" means a direction orthogonal to the axial direction of the barrel. Further, the "outer axis direction" means a direction radially away from the center of the barrel along the aforementioned barrel. The "in-diameter direction of the shaft" means a direction in the radial direction of the cylinder barrel near the center of the barrel.

As shown in FIGS. 1 and 2, the writing instrument 1 includes a barrel 10, and a clip 20 that is inserted through the front opening 11a of the barrel 10 and protrudes forward from the front end of the barrel 10; The writing core 30 inserts the lead core 31 into the pen holder 20 and protrudes forward from the front end of the pen holder 20; the advancing and retracting member 40 abuts against the writing core support portion 32g20 of the writing core 30 from the rear, and is relatively The shaft cylinder 10 can advance and retreat by a predetermined amount; and the writing core urging member 50 urges the advancing and retracting member 40 forward with respect to the bobbin 10.

Further, in the present embodiment, the writing core 30 is composed of a plurality of members including the lead core 31, and not only the lead core 31.

According to the illustrated example, the shaft barrel 10 is connected and fixed to the rear end side of the front side barrel 11 by a connecting means such as screwing, fitting, and bonding, and is formed to have a tapered shape on the front end side. The shape is generally elongated and tubular.

As another example of the bobbin 10, it is possible to include a state in which one cylinder is included, a front opening to which a separate body is connected to the distal end side of the cylindrical body, and an aspect including three or more cylinders.

A front side opening portion 11a for inserting a pen holder 20 to be described later is provided on the distal end side of the barrel 10 to protrude forward. In the inner peripheral surface of the bobbin 10, the front side opening portion 11a is reduced in diameter from the rear side portion, and the front end portion of the inner side of the reduced diameter portion receives the front end of the pen holder urging member 13.

According to the illustrated example, the front side opening portion 11a is an inner peripheral surface of a cylindrical hole substantially parallel to the shaft axis, and is provided at a front end edge portion thereof for reducing the cam slope 20a with the clip 20 The convex portion 11b of the frictional resistance.

Further, on the inner circumferential surface of the barrel 10, a segment portion 11c having a front side reduced diameter is provided on the rear side (more specifically, the rear side than the spring receiving portion 21) than the pen holder 20. The segment portion 11c receives the projection 32g21 of the writing core 30 to be described later from the front, and restricts the entire writing core 30 from moving forward.

Further, on the inner circumferential surface of the barrel 10, a ring-shaped segment portion 11n whose front side is reduced in diameter is provided on the rear side of the segment portion 11c. The segment portion 11n abuts so as to receive the distal end of the advancing and retracting member 40, which will be described later, and restricts the forward/backward member 40 from moving forward.

Further, the peripheral wall of the bobbin 10 is provided with a recess 12a which is recessed in the outer diameter direction of the shaft and extends in the axial direction of the cylinder, and the advancing and retracting member 40 is engaged with the recess 12a so as to advance and retreat by a predetermined amount.

As shown in Fig. 7, the recessed portion 12a is provided with a hole having a rectangular shape when viewed from the plane of the peripheral wall on the distal end side of the peripheral wall of the rear side barrel 12, and the front end side of the side barrel 12 including the hole is inserted. It enters the front side shaft barrel 11. The length of the recessed portion 12a in the axial direction of the cylinder is appropriately set so that the advancing and retracting member 40 can advance and retreat by a predetermined amount.

According to the illustrated example, the pen urging member 13 is a compression coil spring in which the pen holder 20 is inserted in the center side gap, and the pen holder 20 is biased rearward via the spring receiving portion 21 .

In addition, as another example of the clip urging member 13, it is possible to use an elastic body such as an elastic material resin or a rubber, a state in which an elastic body such as a leaf spring is used, and a use of the clip urging member 13 The tension spring is tightened at the rear.

The pen holder 20 is retractably engaged with the front side opening portion 11a (specifically, the convex portion 11b) via the cam slope 20a of the outer peripheral portion of the pen holder 20 so as to advance in position relative to the barrel 10 and the writing core 30. The initial position before the advancement advances and retreats.

Further, the pen holder 20 is in contact with the front side opening portion 11a of the barrel 10 over the entire circumference at the initial position (see Fig. 8(a)), whereby the pen holder 20 cannot be moved in the radial direction of the barrel. The front side opening portion 11a is fitted. Further, in the pen holder 20, the outer diameter of the rear side portion of the cam slope 20a is smaller than the inner diameter of the front side opening portion 11a, so that it is capable of being along the shaft barrel at the advanced position (see FIG. 8(b)). The state of the play of the radial movement is fitted to the front side opening portion 11a.

Further, a spring receiving portion 21, which will be described later, is integrally fixed to the rear end side of the pen holder 20. The clip 20 and the spring receiving portion 21 are received by the cushion member 33 made of an elastic material when the clip urging member 13 in the barrel 10 is biased toward the rear of the barrel by the force of the clip urging member 13.

Specifically, the pen holder 20 is a substantially cylindrical member that penetrates the front opening portion 11a in the front-rear direction, and has an outer peripheral portion that is slidably attached to the front end edge (in detail, the convex portion 11b) of the front side opening portion 11a. The annular cam slope 20a.

The cam slope 20a is formed in a conical shape that expands toward the front, and is disposed to be slidably coupled to the front opening portion 11a (in detail, the convex portion 11b), and is configured to be applied to the outer direction of the shaft of the pen holder 20 A moving direction changing mechanism (moving direction changing member) that advances the pen holder 20 with respect to the barrel 10 and the writing core 30.

Moreover, according to the illustrated example, the portion of the pen holder 20 that is closer to the front side than the cam slope 20a is reduced in diameter.

Further, the inside of the pen holder 20 has a lead sliding hole 20b which is slidable to the outer peripheral surface of the lead core 31 on the front side of the cam inclined surface 20a, and an enlarged diameter on the rear side of the lead sliding hole 20b. And the writing core sliding hole 20c which is slidable with the writing core 30.

The lead sliding hole 20b is a hole formed to be slightly larger than the outer diameter of the lead core 31 in contact with or close to the outer peripheral surface of the lead core 31, and extends rearward from the front end portion of the pen holder 20 to be inserted through The writing core is in the sliding hole 20c.

The writing core sliding hole 20c is a hole that is formed to be slightly larger than the outer diameter of the front side holding portion 32g1 on the distal end side of the writing core 30 in order to come into contact with or approach the outer peripheral surface of the tip end side of the writing core 30.

Further, the writing core sliding hole 20c of the illustrated example is formed in a stepped shape in which the outer peripheral surface of the front holding portion 32g1 is reduced in diameter toward the front, and is another example of the writing core sliding hole 20c, and is slid to the front end side of the writing core 30. If you move forward and backward, you can also have a cylindrical shape without steps.

The pen holder 20 having the above configuration is retractably engaged with the front side opening portion 11a of the barrel 10 via the outer peripheral cam slope 20a, and is inserted into the barrel 10. Further, in the bobbin 10, the spring receiving portion 21 is connected and fixed to the outer peripheral surface of the rear end side of the clip 20 by a connecting means such as fitting.

The spring receiving portion 21 has an outer diameter larger than the outer diameter of the rear end side of the pen holder 20 and Further, the cylindrical member having a gap with respect to the inner circumferential surface of the barrel 10 is abutted against the rear end of the pen holder biasing member 13 by the end portion on the distal end side, and the biasing member 13 is biased by the pen holder The rear is stressed and received by the cushioning member 33 from the rear side.

The spring receiving portion 21 can be slightly inclined with respect to the axial center of the shaft by the gap (see Fig. 9).

At the rear end portion of the spring receiving portion 21, a plurality of projections 21a projecting toward the rear of the barrel and partially pressing the cushioning member are provided at regular intervals in the circumferential direction (see FIGS. 5 and 6(a1)).

Further, the cushioning member 33 is an annular member including an elastic material such as rubber and an elastic material resin, and is annularly fitted to the outer circumference of the holding cylinder 32g which will be described later in detail, and is sandwiched by the rear end surface of the spring receiving portion 21 and the writing core. The front end faces of the portions 32g20 are elastically deformed.

Further, as the buffer member 33 exemplified in the drawings, an O-ring of the above-described material is used as a particularly preferable aspect, and as another example, a sponge-like synthetic resin foam or the like may be used.

Further, as another example of the cushioning member 33, a coil spring whose elastic force is weaker than the pen holder biasing member 13 can be used.

Further, the writing core 30 is a writing core for a mechanical pencil having a lead core 31 and a lead screw unwinding mechanism 32 that can revolvely hold the lead core 31, and the lead core 31 is inserted through the pen holder 20 in a manner of being unscrewed. It is disposed in the barrel 10 .

The lead core 31 is a long-shaped cylindrical shaped lead core for a mechanical pencil.

The lead screw unwinding mechanism 32 is provided with a core reservoir 32a having a lead core 31 built therein and held in advance by a predetermined amount in the barrel 10; the chuck 32b is connected to the front end of the core reservoir 32a and clamped Holding the lead 31 forward and releasing it; the clutch ring 32c is taken off to the rear side Engaged in the chuck 32b; the core breaker 32d holds the lead core loosely on the front side of the chuck 32b; the slider 32e is located between the chuck 32b and the core interrupter 32d, and It is possible to advance and retreat in a state in which the lead core 31 is inserted; the slider biasing member 32f urges the slider 32e rearward; the holding cylinder 32g has the chuck 32b, the clutch ring 32c, and the core breaker 32d built therein The slider 32e, the slider biasing member 32f, and the like, and the core reservoir biasing member 32h bias the core reservoir 32a rearward with respect to the retaining cylinder 32g.

The core reservoir 32a is formed in an elongated cylindrical shape capable of accommodating a plurality of lead cores 31, and its rear end portion is disposed in the vicinity of the rear end opening portion of the barrel 10. The core reservoir 32a is molded of a synthetic resin material so as to be elastically deflectable.

A lead lead introduction tube 32i for guiding the lead core 31 from the rear of the bobbin 10 to the core reservoir 32a is connected to the rear end of the core reservoir 32a. Further, an eraser 32j that blocks the rear end opening of the lead core introduction pipe 32i and an ejector cover 32k that covers the eraser 32j from the rear are detachably connected to the rear side of the lead core introduction pipe 32i. The rear end side of the ejector cap 32k protrudes rearward from the rear end of the bobbin 10 so that the ejection operation can be performed.

Further, a connecting member 32m is integrally connected to the front end of the core reservoir 32a.

The connecting member 32m is a substantially cylindrical member that is fixed to the front end of the core reservoir 32a and through which the lead core 31 is inserted, and has a rear end side of the chuck 32b fixed at the front end thereof, and a flange portion on the center side in the front-rear direction. The rear end of the core reservoir urging member 32h is received.

Further, as another example, the connecting member 32m may be omitted, and the rear end side of the chuck 32b may be directly connected to the front end side of the core reservoir 32a, and the core storage may be directly received by the front end edge of the core reservoir 32a. The rear end of the force applying member 32h.

The chuck 32b is formed of a synthetic resin material or a metal material that is elastically deflected, A plurality of (for example, about 2 to 4) claw portions disposed in a core shape around the lead core 31 are provided, and the lead portions 31 are sandwiched by bending the claw portions in the axial direction of the shaft tube. It is impossible to retreat, and the lead core 31 is released by elastically restoring the claw portions.

An outer diameter portion of the chuck 32b including the front end portion of the claw portion inserted into the front end side of the claw portion in the holding cylinder 32g is expanded in diameter from the rear side portion.

The clutch ring 32c is a substantially cylindrical member that is engaged with the inner circumferential surface of the holding cylinder 32g to be described later by a predetermined amount of advance and retreat.

The clutch ring 32c is fitted to the plurality of claw portions of the chuck 32b from the rear side, and is held in a state in which the plurality of claw portions are closed. When the chuck ring 32b is advanced together with the chuck 32b, the clutch ring 32c is locked to the holding cylinder 32g from the aforementioned plurality The claws are relatively detached rearward.

Further, the chuck 32b and the clutch ring 32c may have a well-known structure.

The core breaker 32d is a cylindrical member including an elastic body such as a synthetic rubber and an elastic material resin, and is fitted into the front end side of the holding cylinder 32g so as not to be retractable, and elastically grips the lead core 31 inserted through the inside.

The slider 32e is a substantially cylindrical member that receives the rear end of the slider urging member 32f by the segment of the outer peripheral surface and that inserts the gap of the lead core 31 into the center portion, and is biased toward the rear by the slider biasing member 32f. The force abuts against the front end of the chuck 32b. The inner circumferential surface of the sliding cylinder 32e is a cylindrical shape continuous throughout the entire circumference, and is formed to have an inner diameter that is close to or in contact with the outer circumferential surface of the lead core 31.

Further, the rear end side of the slide cylinder 32e is expanded in diameter toward the front side thereof, and a core powder discharge groove 32e2 for discharging the core powder is formed in the enlarged diameter portion 32e1.

The core powder discharge groove 32e2 is continuous in the axial direction so as to penetrate the peripheral wall of the diameter-enlarged portion 32e1 in the axial direction. As shown in Fig. 4, a plurality of the core discharge grooves 32e are provided at regular intervals in the circumferential direction of the sliding cylinder 32e. The width and depth of the slider 32e are appropriately set to move the core powder in the axial direction.

The core powder discharge grooves 32e2 adjacent to each other in the circumferential direction are formed in a longitudinal rib shape, and a chamfered portion 32e11 which is inclined forward and inclined in the axial direction is provided on the front end side of the longitudinal rib portion. When the slider 32e advances and retracts, the chamfered portion 32e11 reduces the frictional resistance with the inner peripheral surface of the holding cylinder 32g. Further, the front end surface of the enlarged diameter portion 32e1 functions as a receiving portion that receives the rear end seat portion of the slider urging member 32f.

In the third drawing, reference numeral 32e3 is a rib that is fitted to the inner peripheral surface of the rear end side of the slider urging member 32f.

The slider biasing member 32f is a compression coil spring that is annularly located around the lead core 31, and the front end thereof is locked in the holding cylinder 32g, and the rear end abuts against the sliding cylinder 32e.

As another example of the slider biasing member 32f, an elastic body including an elastic material resin or rubber, and a tension spring that pulls the slider 32e rearward may be used.

The holding cylinder 32g is integrally formed by a front side holding portion 32g1 that is inserted into the pen holder 20 in a forward and backward direction, and a rear side holding portion 32g2 that is integrally connected to the rear end side of the front side holding portion 32g1.

Further, in the present embodiment, as the production efficiency is particularly good, the holding cylinder 32g is constituted by a plurality of members as described above, and as another example, the member may be constituted by an integral member.

The front side holding portion 32g1 is formed in a substantially cylindrical shape having a step portion of the front side reduced diameter, and is inserted into the writing core of the pen holder 20 by individually sliding the outer peripheral surfaces of the front end side and the rear end side to the inner surface of the pen holder 20 Slide the hole 20c.

A front end side of the chuck 32b, a clutch ring 32c, a core breaker 32d, a slide 32e, and a slide biasing member 32f are inserted into the front side holding portion 32g1.

The inner peripheral surface of the front side holding portion 32g1 is provided with a rear side abutting portion 32g11 that receives the clutch ring 32c from the rear side and a front side abutting portion 32g12 of the clutch ring 32c that is moved forward from the front side. According to the illustrated example, the rear side abutting portion 32g11 is the front end portion of the rear side holding portion 32g2. Further, the front side abutting portion 32g12 is a step portion in which the front side of the front side holding portion 32g1 is reduced in diameter.

In the inside of the rear side holding portion 32g2, the base end side of the chuck 32b is fixed to the front side thereof, and the front end side of the connecting member 32m is inserted forward and backward on the rear side.

Further, the front end portion of the rear side holding portion 32g2 and the front side holding portion 32g1 are connected and fixed, and the rear end portion of the rear side holding portion 32g2 receives the front end of the core reservoir urging member 32h.

Further, the outer peripheral portion on the rear side of the rear side holding portion 32g2 is integrally connected to the writing core supporting portion 32g20 that protrudes in the outer diameter direction, and is fitted in the ring shape on the front side of the writing core supporting portion 32g20. Buffer member 33.

The writing core support portion 32g20 is vertically movable in the shaft cylinder 10 in a state of being in contact with the segment portion 11c and the writing core supporting inclined surface 41 in the radial direction.

As described in detail, the writing core support portion 32g20 has a projection 32g21 that can abut against the segment portion 11c in the barrel 10 from the rear, and a writing core support that can be moved from the front and the advancing and retracting member 40 on the rear side of the projection 32g21. The abutting portion 32g22 that the inclined surface 41 abuts.

The projection 32g21 is such that the writing core 30 cannot advance with respect to the barrel 10 and is engaged with the barrel 10 by radially moving along the barrel as the pen holder 20 is tilted forward.

As will be described in detail, as shown in FIG. 2 and FIG. 6 (a2), a plurality of (four in the illustrated example) projections 32g21 are provided in the outer peripheral portion of the rear side holding portion 32g2 at intervals in the circumferential direction of the cylinder. Each of the projections 32g21 protrudes outward in the direction of the outer diameter of the cylinder. A gap capable of moving the writing core 30 in the radial direction of the barrel is secured between the inner circumferential surface of the barrel 10 and each of the projections 32g21. That is, a plurality of protrusions 32g21 The outer diameter is set to be smaller than the inner diameter of the barrel 10.

Further, the abutting portion 32g22 is provided integrally with the projection 32g21 on the rear side of the projection 32g21, and is formed in a convex curved shape that is slidably coupled to the writing core supporting inclined surface 41 at the tip end of the advancing and retracting member 40, which will be described later.

According to the above configuration, as shown in FIG. 9, the writing core 30 as a whole has the projection 32g21 and the abutting portion 32g22 as fulcrums, and the front side portion can be rotated in a direction in the radial direction of the shaft cylinder, and when the rotation is performed The rear side portion of the fulcrum is rotated toward the opposite side of the shaft in the radial direction.

Further, according to the writing core supporting portion 32g20 having the above configuration, since the plurality of projections 32g21 individually press the cushioning member 33 individually, the cushioning member 33 in the pressing portion can be largely elastically deformed.

Further, the advancing and retracting member 40 is a substantially cylindrical member in which the gap of the writing instrument 1 is inserted into the center side thereof. A writing core supporting inclined surface 41 that expands in a substantially conical shape toward the front is formed on the inner diameter of the front end surface of the advancing and retracting member 40.

The writing core supporting inclined surface 41 is slidably contacted with the abutting portion 32g22 on the side of the lead screw unwinding mechanism 32, so that the tilting movement of the pen holder 20 and the lead screw unwinding mechanism 32 is easily performed.

Further, the outer circumferential surface of the advancing and retracting member 40 is provided with a segment portion 42 that receives the distal end of the writing core urging member 50, and a recess portion 12a that is retractably engaged with the bobbin 10 side is provided on the rear side of the segment portion 42. The engagement protrusion 43 is formed. The segment portion 42 is an annular segment portion that expands the front side.

A plurality of (two in accordance with the illustrated example) engaging projections 43 are provided so as to correspond to the plurality of recesses 12a on the side of the barrel 10 individually. As shown in Fig. 7, each of the engaging projections 43 is provided at an inner portion of the U-shaped notch formed on the peripheral wall of the advancing and retracting member 40. According to this configuration, the engagement projection 43 can be flexibly elastically flexed in the radial direction of the barrel, and further, as shown in Fig. 7, it can be easily The operation of inserting the advancing and retracting member 40 into the rear side barrel 12 to lock the engaging projection 43 in the recess 12a is performed.

Each of the engagement projections 43 is movable in the front-rear direction in the recessed portion 12a, and is held by the biasing end of the recessed portion 12a in the normal state by the biasing force of the writing core biasing member 50 to be described later.

The writing core urging member 50 is annularly attached to the outer peripheral portion of the advancing and retracting member 40 by abutting the front end thereof to the segment portion 42 on the outer circumference of the advancing and retracting member 40, and abutting the rear end thereof to the rear side bobbin 12 The front end is also the segment portion 12b, thereby biasing the advancing and retracting member 40 forward.

The elastic force of the writing core urging member 50 is appropriately set so that the writing core 30 is retracted by a rearward force equal to or higher than a predetermined writing pressure.

Further, the writing tool 1 is provided with the above-described four urging members, and the order of application of the urging members is a slider urging member 32f, a clip urging member 13, and a writing core urging member. 50. Core reservoir urging member 32h.

Next, the effect of the features of the writing instrument 1 configured as described above will be described in detail.

First, when a pressing force is applied to the ejector cover 32k in order to protrude the lead core 31, the holding cylinder 32g causes the writing core support portion 32g20 to abut against the segment portion 11c and cannot advance. In this state, with the core reservoir 32a When the chuck 32b grips the lead core 31, the front end side of the lead core 31 is elastically held by the core breaker 32d, and the clutch ring 32c is locked in the holding cylinder 32g in the middle of the advancement (detailed In other words, the front side abutting portion 32g12) is disengaged, and the chuck 32b is released in the outer diameter direction of the shaft.

When the pressing force is removed, the chuck 32b is retracted and fitted to the clutch ring 32c to be reduced, and the lead core 31 is again clamped. These actions are repeated by the ejection operation, before the lead 31 The protrusion protrudes from the front end of the pen holder 20.

Further, when the chuck 32b is advanced, the slider 32e which is pressed by the chuck 32b to cover and protect the lead core 31 also advances against the urging force of the slider urging member 32f.

The portion between the core breaker 32d and the slider 32e in the lead core 31 is covered and protected by the slider 32e, so that the lead core 31 can be prevented from being broken due to the falling of the writing instrument 1, or the lead core can be broken. Or a lead core or the like which becomes a residual core is clogged between the core breaker 32d and the chuck 32b.

When the chuck 32b and the slider 32e are repeatedly moved forward and backward, some core powder may be generated due to the sliding contact between the chuck 32b and the slider 32e and the lead core 31, but the core powder may not accumulate in the slip. The outer peripheral portion of the cylinder 32e is discharged toward the front side or the rear side in the axial direction by the core powder discharge groove 32e2 on the outer periphery of the cylinder 32e. Thereby, it is possible to prevent the core powder from being fixed to the outer peripheral portion of the sliding cylinder 32e, thereby preventing the forward and backward movement of the sliding cylinder 32e and the advancement and retreat operation of the chuck 32b of the sliding cylinder 32e.

Further, it is expected that the core powder finally passes through the gap of the outer circumference of the lead core 31, and is discharged to the front side of the clip 20 together with the lead core 31.

Further, in the normal writing state in which the barrel 10 is tilted and pressed against the writing surface P, as shown in Fig. 8(a), the lead core 31 of the writing core 30 projecting forward from the pen holder 20 is written. The surface P receives a reaction force (pen pressure) in a direction intersecting the lead core 31 (in other words, a radial direction of the barrel). At this time, when the reaction force is larger than the normal pen pressure range, the pen holder 20 receives the reaction force to cause the cam slope 20a of the pen holder 20 to slide with the front side opening portion 11a (in detail, the convex portion 11b). It moves toward the outer diameter of the cylinder, and advances against the urging force of the pen urging member 13. At the time of this advancement, the writing core 30 including the lead core 31 moves in the radial direction along the barrel in an inclined manner together with the clip 20 and the lead screwing mechanism 32.

Further, the front end side of the lead core 31 constituting the writing core 30 is covered and protected by the advancing pen holder 20. (Refer to Figure 8 (b)).

Then, when the lead core 31 is separated from the written surface P and the reaction force is removed, the pen holder 20 is retracted by the biasing force of the pen holder urging member 13, and returns to the initial position.

At the time of this retreat, the spring receiving portion 21 integral with the pen holder 20 abuts the rear end portion of the cushion member 33. The cushioning member 33 is received by the writing core supporting portion 32g20 from the rear side, and thus elastically contracts. Therefore, it is possible to alleviate the impact sound when the pen holder 20 abuts against the front side opening portion 11a of the barrel 10.

Further, when the retraction is performed, the spring receiving portion 21 abuts the bumper 33 that is divided in the circumferential direction. Further, the writing core supporting portion 32g20 also presses the projection 32g21 which is divided and arranged in the circumferential direction against the cushioning member 33. Therefore, the cushion member 33 can be largely contracted in the circumferential direction, and the above-described impact sound can be effectively alleviated.

In addition, as another example, a configuration in which a projection other than the illustrated example abuts against the cushioning member 33 or a configuration in which the projection 21a and the projection 32g21 are abutted and the flat surface is brought into contact with the cushioning member 33 may be omitted.

Further, the biasing force of the pen urging member 13 is appropriately set so that the pen holder 20 does not advance under the pen pressing force in the normal intersecting direction of the lead core 31, and the lead core 31 is crossed by the lead core 31. The pen holder 20 advances before being broken by the direction of the pen pressure.

Further, the operation of the entire writing core 30 during the forward movement will be described. As shown in FIG. 9, the writing core 30 has a projection 32g21 and abutting portion 32g22 as a fulcrum, and a radial direction toward the cylinder. The direction (upward according to Fig. 9) is rotated while the rear side portion (core reservoir 32a, etc.) is rotated toward the other side in the radial direction of the barrel.

Further, the core reservoir 32a is elastically deflected by abutting the lead core introduction tube 32i on the rear end side against the inner circumferential surface of the barrel. By the rotation of the writing core 30 as a whole, the pen holder 20 is tilted, one We move forward in the direction of the outside and move forward.

Further, during the above-described rotation, the range of the clamp 20 to the axial direction of the connecting member 32m in the axial direction of the cylinder is maintained substantially linear. Therefore, the lead core 31 does not break due to the bending of the aforementioned range. Further, as shown in Fig. 9, the portion of the lead core 31 projecting rearward from the connecting member 32m is located in a space having an inner diameter larger than that of the core reservoir 32a of the connecting member 32m, so that the lead core 31 does not occur with the core. The inner peripheral surface of the reservoir 32a is in contact with each other and is broken.

Next, the operation when the lead core 31 is pressed by the axial direction of the cylinder tube will be described in detail.

When the lead core 31 is pressed against the lead core 31 that is strongly pressed perpendicularly to the surface P to be pressed, when the lead core 31 receives a pressing force toward the rear, as shown in Fig. 10 (a) and (b), the pressing force is first applied to the backward movement. The chuck 32b of the lead core 31 is clamped. Then, the pressing force applied to the chuck 32b is transmitted to the advancing and retracting member 40 via the clutch ring 32c, the holding cylinder 32g, and the like, and the advancing and retracting member 40 is retracted against the urging force of the writing core urging member 50.

Therefore, as shown in Fig. 10(b), the lead core 31 enters the clip 20 to prevent damage or the like due to the aforementioned pressing force.

Further, according to the above-described embodiment, the cam slope 20a of the pen holder 20 is an inclined surface having a linear cross section, and as another example of the cam slope, it is possible to provide an inclined surface having a convex curved surface in cross section (refer to Fig. 11 (a). )), an inclined surface having a concave curved surface (see Fig. 11 (b)), and an intermittent inclined surface (see Fig. 11 (c)).

Next, a modification of the characteristic portion in the writing instrument of the present invention will be described. In addition, the modification shown below is a part of the change of the above-described writing instrument 1. Therefore, the modified part will be mainly described in detail, and the same part as the writing instrument 1 is attached. The same symbols as those of the writing instrument 1 are omitted and repeated detailed explanations are omitted.

The writing instrument 2 shown in Figs. 12(a) and (b) is provided with a cam slope 11a' at the front opening of the barrel 10'. The cam slope 11a' constitutes a movement direction changing mechanism that causes the pen holder 20' to be slid and advanced by a force applied to the outer direction of the cylinder bore 20'.

Similarly to the above-described barrel 10, the shaft cylinder 10' is composed of a single or a plurality of cylinders, and the opening portion whose diameter is reduced at the front end side has an annular cam slope 11a' which is expanded toward the front.

The pen holder 20' is retractably engaged with the front side opening portion of the barrel 10' via the cam slope 11a', and is biased toward the rear of the barrel by the pen holder biasing member 13 in the barrel 10', and is resisted The pen grip urging member 13 is movable in the radial direction of the barrel in a state where the urging force of the urging member 13 is advanced.

That is, the pen holder 20' is configured to replace the cam slope 20a with the cam slope 11a' of the front side opening portion of the barrel 10', and to provide an annular protrusion on the outer circumferential surface of the pen holder 20'. 20a'. The annular projection 20a' is disposed to be in sliding contact with the cam slope 11a'.

According to the writing instrument 2 shown in FIGS. 12(a) and (b), the reaction force (pen pressure) in the intersecting direction is applied from the writing surface P to the front side from the pen holder 20' in substantially the same manner as the above-described writing instrument 1. The lead core 31 of the protruding writing core 30 is subjected to the reaction force when the reaction force is greater than the normal pen pressure range, so that the annular protrusion 20a' of the pen holder 20' is on the front side of the barrel 10' The cam slope 11a' of the opening slides and moves forward while moving outward in the direction of the cylinder bore.

Thereby, according to the writing instrument 2, the lead core 31 protruding from the pen holder 20' can also be covered and protected by the advancing pen holder 20'.

Further, the core powder discharge groove 32e2 on the outer circumference of the slide cylinder 32e discharges the core powder generated by the advancement and retreat of the chuck 32b and the slide cylinder 32e in the axial direction, and the malfunction caused by the core powder fixing can be reduced.

Further, when the pen holder 20' is retracted, the spring receiving portion 21 which is retracted integrally with the pen holder 20' abuts against the cushioning member 33, and the cushioning member 33 is elastically contracted. Therefore, the action sound caused by the retraction of the pen holder 20' and the spring receiving portion 21 can be reduced.

Further, according to the above embodiment, when the pen holder 20 (or 20') is tilted while moving toward the outer diameter of the cylinder, the core reservoir 32a is abutted against the barrel 10 on the rear end side thereof. Further, the flexure (refer to Fig. 9), as another example, the core reservoir 32a may be swingably coupled to the connecting member 32m. In the other example, for example, one of the rear end side of the connecting member 32m and the front end side of the core accumulator 32a may be provided with a concave portion and a convex portion that are fitted in the radial direction of the barrel in a state of having a play.

Further, according to the above embodiment, the writing core 30 is used as a writing core for a mechanical pencil (sometimes referred to as a replacement for a mechanical pencil), and as another example, the writing core 30 may be used as a writing core for a ballpoint pen (for a ballpoint pen) Refilling core and the writing core of the pen, the writing core of the marker, and the writing core of the correction pen.

For example, when a writing core for a ballpoint pen having a needle shape (in other words, an elongated cylindrical shape) is used as the writing core 30, the needle-like portion of the ballpoint pen tip portion is inserted into the pen holder 20, The tip end portion is protruded forward from the distal end of the pen holder 20 (or 20'), and the ballpoint pen writing core is supported in the barrel 10 so as to be tiltable similarly to the writing core 30.

In addition, when the writing core 30 is a writing core other than the writing core for a pencil, the front end portion of the writing core can be protruded from the front end of the writing clip 20 (or 20') so as not to enter. The front end portion of the writing core enters and exits from the front end of the pen holder 20 (or 20').

And, according to the above embodiment, only in the front end side opening portion of the barrel and the pen holder One side of the cam slope is provided, and as another example, it may be arranged on both sides to advance the pen holder by sliding the cam slopes to each other.

Further, according to the above embodiment, the cam slope is provided on the outer circumferential surface of the pen holder 20 and the front opening portion of the barrel 10, and as another example, as shown in Fig. 13, the cam slope may be provided to the pen holder 20" The aspect of the back end.

The writing instrument 3 shown in Fig. 13 is provided with an annular recessed portion in which the gap is fitted to the front end edge of the barrel 10" at the rear end side of the clip 20", and the surface on the outer diameter side in the recess is oriented. The cam slope 23" of the front diameter is reduced. The tubular protection tube 22" is fixed to the front end side of the pen holder 20" so as to cover the lead core 31.

According to the writing instrument 3, as in the above-described embodiment, the force applied in the intersecting direction is applied to the pen holder 20" via the lead core 31 at the tip end of the writing core 30, and the cam inclined surface 23" slides on the front end edge of the barrel 10". The clip 20" and the protective tube 22" are advanced (refer to the double-dot chain line of Fig. 13). That is, the cam inclined surface 23" acts as a clip by the force applied to the outer direction of the shaft diameter of the cam slope 23" The 20" forward movement direction conversion mechanism functions.

Thereby, the front end side of the lead core 31 can be covered and protected by the forward protective tube 22".

Further, by substantially the same mechanism as the above-described writing instruments 1, 2, the core powder can be discharged in the axial direction by the core powder discharge groove 32e2, and the malfunction caused by the fixing of the core powder can be reduced, and the cushioning member 33 can be used. The operation sound when the pen holder 20" and the spring receiving portion 21 are retracted is reduced.

Further, according to the above embodiment, the advancing and retracting member 40 is interposed between the writing core supporting portion 32g20 of the writing core 30 and the writing core urging member 50, but the writing instrument 4 as shown in Fig. 14 may also omit the advancing and retracting member. 40.

The writing instrument 4 shown in Fig. 14 omits the advancing and retracting member 40 from the writing instrument 1 described above, and The writing core force applying member 50 is replaced with a writing core force applying member 50'.

The writing core urging member 50' is a compression coil spring whose diameter gradually decreases toward the front, and is directly received by the front end abutting against the writing core support portion 32g20 in a state where the rear end is received by the front end of the rear side barrel 12. The writing core 30 is biased in front.

Thereby, according to the writing instrument 4 shown in Fig. 14, when excessive pressing force toward the rear is applied to the lead core 31, the writing core 30 is retracted against the urging force of the writing core urging member 50', thereby preventing it from being prevented. The lead core 31 is broken.

Further, according to the mechanism similar to the above-described writing instruments 1, 2, the core powder can be discharged in the axial direction by the core powder discharge groove 32e2, and the malfunction caused by the fixing of the core powder can be reduced, and can be reduced by the buffer member 33. The small pen holder 20 and the sound of the spring receiving portion 21 when retracting.

Further, the moving direction changing mechanism (for example, the cam slope 20a or the like) may be configured to advance the pen holder with respect to the barrel and the writing core by a force applied to a direction outside the diameter of the barrel of the clip, for example, The aspect shown in Fig. 15 may also be a configuration other than the above.

The writing instrument 5 shown in Fig. 15 is for replacing the pen holder 20 with the pen holder 60 with respect to the writing instrument 1 described above.

The pen holder 60 is a substantially tapered tubular member that is inserted into the front side opening portion 11a of the bobbin 10 so as to be retractable, and protrudes forward from the front end of the bobbin 10, and is inserted into the writing core 30 in contact therebetween. Lead 31. The rear end side of the pen holder 60 is connected to the spring receiving portion 21. Therefore, the pen holder 60 is biased rearward by the pen holder biasing member 13.

The pen holder 60 has a flexure piece portion 61 that is deflectable in the radial direction of the shaft cylinder at a portion that is in sliding contact with the front side opening portion 11a of the barrel 10.

As shown in Fig. 16, a plurality of scratches are provided in the circumferential direction at the rear end side portion of the pen holder 60. The curved piece portion 61. As described in detail, the plurality of notches are formed at intervals in the circumferential direction at the rear end side portion of the pen holder 60, and the flexure piece portion 61 is formed between the adjacent notches. On the inner peripheral surface side of each of the flexure piece portions 61, a space in which each of the flexure piece portions 61 is deflected in the direction of the axial direction of the shaft is secured.

The flexible sheet portions 61 may be formed by double-forming a soft synthetic resin material (for example, an elastic material resin or the like) on the rear end side of the pen holder 60 including a hard synthetic resin.

As a result, when the writing instrument 5 shown in FIG. 15 applies a force in the intersecting direction to the pen holder 60 via the lead core 31 at the tip end of the writing core 30, the flex piece portion 61 on the rear end side of the pen holder 60 is deflected. A cam slope 61a is formed on the outer circumferential surface of the flexure piece 61 (see the double-dot chain line in Fig. 15).

Therefore, in the same manner as in the above-described embodiment, the clip 60 is moved by the biasing force of the clip urging member 13 by sliding the cam slope 61a toward the front opening portion 11a of the barrel 10. This advancement is quickly performed by the elastic restoring force acting on the flexure piece portion 61.

Thereby, the leading end side of the lead core 31 can be covered and protected by the forward pen holder 60.

Further, according to the above embodiment, as a particularly preferable aspect, a plurality of core discharge grooves 32e2 on the outer circumference of the slider 32e (according to the illustrated example) are provided, and as another example, the core powder discharge groove may be used. 32e2 is set to a single, or a number other than the example of the figure.

Further, according to the above embodiment, as a particularly effective effect of discharging the lead powder, the core powder discharge groove 32e2 is provided on the sliding surface of the holding cylinder 32g on the rear side of the sliding cylinder 32e, and as another example, A groove that continuously penetrates forward of the core powder discharge groove 32e2 may be provided on the front side of the slider 32e (specifically, a portion on the front side of the enlarged diameter portion 32e1 in Fig. 3).

And, according to the above embodiment, the pen holder 20, 20' or 20" is advanced and retracted. The automatic pencil is provided with the slider 32e and the core powder discharge groove 32e2, and as another example, a mechanical pencil of the type which does not have the above-described pen holder (for example, the invention described in Japanese Patent Laid-Open Publication No. 2010-201813, No. 2010-094954) In the above, the slider 32e is provided between the core breaker and the chuck, or the like, which is used in the automatic pencil for the multifunction writing instrument (for example, the invention described in Japanese Patent Laid-Open Publication No. 2008-126596).

Further, for example, in the invention described in Japanese Laid-Open Patent Publication No. SHO63-180283, the cushion member 33 in the above embodiment may be provided between the intermediate shaft (2) and the pressing portion (3a). Further, in a writing instrument (including a ballpoint pen, a signature pen, or the like) that covers the other aspect in which the pen holder of the writing core advances and retreats relative to the barrel, the cushioning member 33 can be set to be pressed by the retracted pen holder to be contracted.

Further, according to the above embodiment, the spring receiving portion 21 integral with the pen holder 20 is received by the cushioning member 33. Alternatively, the pen holder 20 and the spring receiving portion 21 may be integrally formed as a separate member. The cushion member 33 receives the state of the integral member; and the spring receiving portion 21 is omitted from the above configuration, and a projection that receives the clip urging member 13 is formed on the outer periphery of the rear end side of the clip 20, and the cushion member 33 is provided. Directly accept the aspect of the pen holder 20 and the like.

Further, according to the writing instrument 5 shown in Fig. 15, a portion of the rear end side of the pen holder 60 is formed of a soft synthetic resin material, and as another example, the entire pen holder 60 is formed of a flexible synthetic resin material, and is thereafter The end side portion functions as the above-described flexure piece portion 61.

Further, according to the writing instrument 5 shown in Fig. 15, a plurality of flexure pieces 61 are provided on the rear end side of the pen holder 60. Alternatively, a soft synthetic resin material may be formed on the rear end side of the pen holder 60. A continuous cylindrical flexible sheet portion.

1‧‧‧writing tools

10‧‧‧ shaft tube

11a (11b) ‧‧‧ front opening (protrusion)

13‧‧‧Clamping force member

20‧‧‧ pen holder

20a‧‧‧ cam slope

21‧‧‧Spring Acceptance Department

30‧‧‧ writing core

31‧‧‧ lead core

32b‧‧‧ chuck

32c‧‧‧Clutch ring

32e‧‧ ‧ slide

32e2‧‧‧ core powder drain

32g20‧‧‧writing core support

33‧‧‧ cushioning parts

P‧‧‧ written face

Claims (14)

A writing instrument comprising: a barrel; a pen holder inserted through the front opening of the barrel and protruding forward from the front end of the barrel; the writing core is in contact with the inner peripheral surface of the clip and is inserted through The pen holder is supported by the shaft barrel so as to protrude forward from the front end of the pen holder, and is characterized in that: a movement direction changing mechanism is provided between the barrel and the pen holder, and the movement direction changing mechanism is applied by The force of the outer direction of the barrel of the pen holder advances the pen holder with respect to the barrel and the writing core. The writing instrument of claim 1, wherein the moving direction changing mechanism is configured to be disposed on the shaft by at least one of a shaft barrel and the clip, and the clip is passed through the cam slope to be retractably engaged with the shaft. The cam is inclined such that the cam slope is inclined such that the force is applied to the outer direction of the outer diameter of the outer diameter of the pen holder and the other one of the ones is slidably advanced. The writing instrument according to the second aspect of the invention, wherein the cam slope is provided at least one of an outer circumferential surface of the pen holder and a front opening of the shaft cylinder so as to expand toward the front, and is opposite to the one side The other side slides to advance the aforementioned clip. The writing instrument of claim 1, wherein the pen holder is disposed between the forward advance position and the forward position before the advancement with respect to the barrel and the writing core, and is formed as follows: In the initial position, the front side opening portion of the barrel is not movably moved in the radial direction of the barrel, and is fitted to the front side opening in a state in which the movement in the radial direction of the barrel is insufficient in the forward position. A writing instrument according to claim 1, wherein the pen clamping force applying member is provided to urge the pen holder toward the rear with respect to the barrel. The writing instrument of claim 1, wherein the writing core is supported to be vertically movable in a radial direction of the barrel relative to the barrel at a rear side of the pen holder. The writing instrument of claim 1, wherein the shaft barrel has a segment portion for reducing the front side diameter; and the writing core supporting the inclined surface, and expanding the diameter toward the front side of the segment portion, in the foregoing The outer peripheral portion of the writing core includes a writing core supporting portion that protrudes outward in the radial direction, and the writing core supporting portion is disposed between the segment portion and the writing core supporting inclined surface in the barrel, and is capable of being along the rear and the shaft The cylinder is slightly moving in the radial direction. The writing instrument of claim 1, wherein the writing core is a writing core for a pencil with a lead core and a lead screw unscrewing mechanism that can revolvely hold the lead core, and the lead core is unscrewed The rod is inserted into the barrel in the manner of the aforementioned pen holder. The writing instrument of claim 8, wherein the lead screw unscrewing mechanism comprises: a core reservoir, a built-in lead core, and is held in advance and retreat in the barrel; the chuck, and the core reservoir The front end is connected and clamped to the lead core; the clutch ring is fitted to the chuck in a manner of being detached to the rear side; the core breaker is elastically held on the front side of the clutch ring; the retaining cylinder is retractable The core chuck and the clutch ring are built in, and the core breaker is built in, and the core reservoir biasing member biases the core reservoir rearward with respect to the holding cylinder in the holding cylinder The rear side abutting portion is provided, and the clutch ring is received from the rear side; and the front side abutting portion receives the clutch ring when moving forward from the front side. The writing instrument according to claim 9, wherein the pen holder is fitted to the front end side of the holding cylinder so as to be retractable. The writing instrument of claim 9, comprising: a sliding cylinder located between the chuck and the core interrupter, and capable of advancing and retracting in a state in which a lead core is inserted; and a sliding force applying member; The slide cylinder is biased rearward relative to the aforementioned retaining cylinder. The writing instrument according to claim 1, wherein a writing core urging member for biasing the writing core forward with respect to the shaft cylinder is provided in the shaft cylinder, and the writing core is oriented by a predetermined writing pressure or more The rear force retreats against the urging force of the aforementioned writing core urging member. The writing instrument of claim 11, wherein the outer peripheral surface of the sliding cylinder is provided with a core powder discharge groove penetrating in the axial direction. The writing instrument according to any one of claims 1 to 13, wherein a cushioning member is provided, and the cushioning member is elastically deformed by receiving the pen holder when retracting.