JP2002301894A - Mechanical pencil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem that a gap has occurred between the rear end of a short lead (hereinafter referred to as a 'residual lead') removed from a chuck unit and the front end of a following new lead (hereinafter referred to as a 'following lead'), when the gap has occurred, in the case of writing, the residual lead is retracted by its writing pressure, it causes writing mistake to take place and causes a writer to feel a sense of incongruity, the writer dislikes this phenomenon and hence draws the residual lead from a guide member, and there is sometimes a user who feeds the following new lead so that the residual lead cannot be effectively used. SOLUTION: A mechanical pencil of the structure, capable of effectively using the residual lead retained at the distal end of a writing instrument is provided. The mechanical pencil comprises a slide member in which a lead inserting hole is formed, at the front side of the barrel, and a lead feeding means longitudinally movably disposed in the barrel. In this pencil, the slide member is interlocked to the retracting operation of at least one member of the feeding means.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sharp shaft in which a slide member having a core insertion hole is provided in front of a barrel, and a core feeding means is disposed inside the barrel so as to be movable back and forth. About the pencil.

[0002]

2. Description of the Related Art As an example of a conventional example, Japanese Utility Model Application Laid-Open No. 56-44 is disclosed.
For example, in Japanese Patent Publication No. 191, a lead tank is disposed inside the shaft main body so as to be able to move back and forth, and a chuck body that feeds the lead forward is fixed to the front end of the lead tank. . A chuck ring is surrounded by a front portion of the chuck body, and opens and closes the chuck body. Further, a tip member is fixed to a front end of the shaft main body, a core insertion hole is formed in the tip member, and a slide member into which a core detent member is press-fitted has a tip end portion of the tip member. It is arranged so that it can appear and disappear.

[0003]

However, in the above prior art, a rear end of a short lead (hereinafter, referred to as a residual lead) which has come off the chuck body and a new lead (hereinafter, referred to as a succeeding lead) are provided. A gap has been created between the front end of the core.) This is because the chuck body is closed by the chuck ring immediately before the retraction operation of the chuck body is completed, and the chuck body retreats while gripping the subsequent core,
At this time, the shortened residual core is in a state independent of the subsequent core, and is lightly held by the core detent member in the leading member, and does not retreat. And
If the gap is generated, the residual core is retracted by the writing pressure during writing, causing writing failure and causing a sense of incongruity. In addition, some users dislike the above phenomenon, pull out the remnant core from the guide member, and then feed out a subsequent new remnant, so that the remnant core cannot be used effectively in some cases.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a mechanical pencil having a novel structure which can eliminate the above-mentioned deficiencies of the prior art and can effectively use the residual core. The present invention is a mechanical pencil having a slide member having a lead insertion hole formed in front of a barrel, and a lead-out means disposed inside the barrel so as to be movable back and forth, wherein the slide is provided. The first gist is that the member and the at least one member of the core feeding means are interlocked with each other, and a slide member having a core insertion hole is provided at the front of the barrel, and the inside of the barrel is provided. A second aspect of the present invention is a mechanical pencil in which a lead-out means is disposed so as to be movable back and forth, and a contact portion for contacting each of the slide member and the lead-out means is formed in a knock member. A mechanical pencil having a slide member having a hole formed in front of the barrel, and a core feeding means disposed inside the barrel so as to be movable back and forth, and pressing the slide member against the barrel. Retreat by That there was a cell as a third aspect.

[0005]

In the above construction of the present invention, the retreating operation of the slider causes the remnant core to retreat in a state of contact with the subsequent retraction.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A first example will be described with reference to FIGS. A core tank 2 is disposed inside the shaft main body 1 so as to be able to move back and forth, and at the front end of the core tank 2, a chuck body 5 that can be opened and closed via a relay member 3 and a core guide member 4 is fixed. ing. In front of the chuck body 5, a chuck body 5
The opening and closing of the chuck ring 6 surrounds it. Also,
A tip member 9 is detachably fixed to the tip of the shaft body 1 via a press-fit member 7 and a connecting member 8 by means such as screwing. The tip member 9 is formed integrally with the shaft body 1. May be. A slide member 10 is disposed inside the tip member 9 so as to be able to move back and forth, and a core detent member 11 made of a rubber-like elastic body and lightly holding a core is press-fitted into the slide member 10. ing. Reference numeral 12 denotes a core protection tube made of a metal material,
Is press-fitted and fixed to the front end of the slide member, but may be formed integrally with the slide member. . Reference symbol S denotes a repellent member such as a coil spring for urging the chuck body 5 and the core tank 2 and the like backward. Further, although the shaft main body of the mechanical pencil in the present embodiment is formed of a transparent material, it is preferable that the slide member, the center detent member and the like are also formed of a transparent material. The movement of the lead, which will be described later, can be confirmed.

Next, the chuck body 5 and the slide member 10 will be described in detail. An outer surface flange portion 13 is formed on the outer periphery of the front end of the chuck body 5. Further, a cylindrical portion 14 is formed to extend behind the slide member 10.
An inner surface flange portion 15 that is in contact with the outer surface flange portion 13 is formed. Here, the chuck body 5 is a so-called collet type chuck composed of two, three or four chuck pieces, and is tightly closed without holding the core. Then, the inner flange 15 of the slide member 10 is moved to the outer flange 13 of the chuck body 5.
Has a structure that escapes. That is, the chuck body 5 and the slide member 10 can be separated and assembled. Although the slide member 10 is loosely inserted into the tip member 9, the slide member 10 may be provided with frictional resistance. However, the frictional resistance is set to be smaller than the friction against the core of the center detent member that holds the core lightly. By preventing the movement of the slide member 10 in a state where the core is not gripped, the movement sound of the slide member 10 generated when the main body is shaken (the middle step of the slide member is (A sound that comes into contact with the inner step) of the vehicle. Further, in front of the inner surface of the tip member 9, an intermediate step portion 16 of the slide member 10 abuts, and an inner surface step portion 17 for regulating the advance amount of the slide member 10 is formed. Next, the operation will be described.
The state shown in FIG. 2 is a state in which the residual core A separated from the chuck body 5 is held by the core detent member 11, and the subsequent core B is gripped by the chuck body 5. When the lead tank 2 is pressed forward from this state, the chuck body 5 moves forward together with the chuck ring 6 and the subsequent lead B
Also move forward. The remnant core A is pushed with the advance of the subsequent core B, and the remnant core A also attempts to advance. However, since the remnant core A is held by the detent member 11, the slide member 10 advances with the remnant core A. Here, when the intermediate step 16 of the slide member 10 comes into contact with the inner step 17 of the tip member 9,
The forward movement of the slide member 10 is restricted. By this operation, the core protection tube 12 fixed to the slide member 10
Moves forward with respect to the tip member 9, so that the projection length of the tip member 9 from the front end is larger than in the initial state.

Here, when the lead tank 2 is further advanced, the residual lead A moves forward in the lead protection tube 12 where the movement is prevented while being pushed by the trailing lead B, and projects and extends from the tip thereof. It is. Eventually, the chuck ring 6 comes into contact with the rear end of the slide member 10, and its forward movement is restricted, and the chuck body 5 expands to release the subsequent lead B. Here, when the forward movement of the lead tank 2 is released, the chuck body 5 retreats with the trailing lead B released, and in this retreating process, the outer flange portion 13 of the chuck body 5 becomes the inner flange portion 15 of the slide member 10. , And the slide member 10 is also retracted. At this time, the residual core A is the core holding member 1 of the slide member 10.
Since it is held lightly at 1, the retraction is performed together with the slide member 10 while maintaining the protruding state of the residual core A, and the subsequent core B released from the chuck body 5 is also retracted. Eventually, the chuck body 5 is closed by the chuck ring 6, and the trailing core B is gripped and retracted. Does not have any gaps. Further, the residual core A is retracted by the above operation,
Since it retreats with respect to the tip member 9 together with the slide member 10, it does not retreat with respect to the core protection tube 12 (slide member 10), so that the projecting length from the core protection tube 12 does not decrease. .

A second example will be described with reference to FIGS. It is a modification of the interlocking means between the chuck body and the slide member of the first example. The outer peripheral flange portion 13 as in the first example is not formed on the front outer peripheral surface of the chuck body 18 of the present example, and a frictional resistance is applied to the inner surface flange portion 15 of the slide member 10. Has become. As an example of applying the friction, the outer diameter of the front outer peripheral surface of the chuck body 18 may be formed to be slightly larger than the inner diameter of the inner surface flange portion 15 of the slide member, and at least one contact surface has a rubber-like elasticity. A body or the like may be applied, or a texture may be applied. Next, the operation will be described. In the initial state (the state in which the chuck body 18 is holding the core: see FIG. 3), the front outer peripheral surface of the chuck body 18 is in contact with the inner surface flange 15 of the slide member 10. Here, the chuck body 1
When the chuck body 18 is advanced (along with the chuck ring 6), the slide member 10 also advances because the chuck body 18 and the inner surface flange 15 are in contact with each other due to frictional resistance. Of course, the residual core A held by the core detent member 11 and the chuck body 1
The trailing core B gripped by 8 also moves forward. Further, when the chuck body 18 and the slide member 10 move forward, the intermediate step 16 of the slide member 10 abuts on the inner surface step 17 of the tip member 9 as in the first example, and the forward movement of the slide member 10 is prevented. (See FIG. 4). However, the chuck body 18
Can be further advanced, the contact between the chuck body 18 and the inner flange 15 of the slide member 10 is released against the frictional force. However, since the chuck body 18 is further advanced, the residual core A moves forward in the core protection tube whose forward movement is restricted.

Then, the chuck ring 6 comes into contact with the rear end of the slide member 10, and the chuck body 18 is expanded.
The trailing lead B is released (see FIG. 5). Here, when the forward movement of the chuck body 18 is released, the chuck body 18 is retracted by the elastic member S, and the front outer peripheral surface of the chuck body 18 and the inner flange 15 of the slide member 10 again come into contact with each other, The slide member 10 also moves backward due to the frictional resistance.
As the slide member 10 retreats, the residual core A held by the detent member 11 also retracts, and the residual core A also retracts the subsequent core B released from the chuck body 18. Eventually, the chuck body 18 is closed by the chuck ring 6, and the trailing core B is gripped and retracted.
There is no gap between the trailing core B and the residual core A. In the second example and the first example, when the chuck body does not grip the core, the outer diameter of the front end outer peripheral surface of the chuck body is smaller than the inner diameter of the inner surface flange of the slide member. Therefore, the chuck body can be easily assembled to the slide member. Also, when assembling with an automatic assembling machine or the like, the front portion of the chuck body can be made to have a substantially uniform outer diameter, so that it can be efficiently applied to a parts feeder or the like.
A third example will be described with reference to FIG. In this example, an outer flange 20 is formed on the outer peripheral surface of the rear end of the slide member 19, and an inner flange 23 is formed on the front end of the chuck body 21 via a tubular portion 22.

As described above, by arranging the chuck body outside the slide member, it is easy to assemble them. That is, in the first and second examples, the amount by which the diameter of the chuck body can be reduced is regulated by the width of the slit formed in the chuck body. Because of the expansion and assembly, the above-mentioned restrictions are eliminated. Further, in this example, since the slide member can sufficiently retreat inside the cylindrical portion, the core protection tube can be stored in the tip member after use.

A fourth example will be described with reference to FIGS. The present example has a configuration substantially similar to that of the first example, but differs in a center detent member. More specifically, the core detent member 24 of the present example is applied to the inner surface of the core protection tube 12. The center detent member 24 is a rubber-like elastic body, and is made of silicone rubber or NBR.
The core detent member 24 is a pipe-shaped core protection tube 1.
The core protection tube 12 may be formed around the core detent member 24 by so-called electroforming, in which metal ions or the like are attached to the surface of the core detent member 24, and formed by attaching metal ions or the like to the surface of the core detent member 24. Is also good. By arranging the core detent member 24 in the core protection tube 12 in this way, even if the residual core A becomes short, the core can be held, and the core can be used effectively. it can. As in the fourth example, means for using the residual core A as effectively as possible includes:
The core protection tube may be press-fitted into the tip member, and the core protection tube 25 is integrally formed with the tip member 9 (see FIG.
Example) may be used. In any case, by shortening the distance from the detent holding part 26 to the tip of the core protection tube 12, the shortened residual core A can be further held,
Thus, the residual core can be used as effectively as possible.

A sixth example will be described with reference to FIGS.
In this example, the core detent member and the core protection tube shown in the first example are integrally formed with the slide member. More specifically, a center detent piece 29 composed of a plurality of divided pieces is formed in the middle part of the inner surface of the slide member 28, and the inner surface of the center detent piece 29 actually holds the core. A trapezoidal projection 30 is formed. Further, at the rear of the slide member 28, two opposing engaging pieces 31 extending rearward are formed.
An inner surface flange 32 is formed on the inner surface of the rear end of 1. The inner flange 32 is in contact with and interlocks with the outer flange 13 of the chuck body 5. The slide member 28
The core protection tube part 33 is also integrally formed in the front part of
A conical portion 34 whose diameter is reduced toward the front is formed at a front portion of the core protection tube portion 33. When writing, the tip of the core is clearly visible and can be written accurately. In addition, as in this example, the core detent, the core protection tube, and the like are integrally formed with the slide member, so that the manufacturing cost of the parts is, of course, increased.
Costs and the like required for assembly are reduced, and as a result, products can be provided to consumers at low cost. In addition, the rear part of the slide member is formed as a two-piece engagement piece, so that the chuck body and the slide member can be easily assembled.

A seventh example will be described with reference to FIG. The sixth
This is a modification of the example, in which the core protection tube portion 36 of the slide member 35 is provided.
And a projection 38 for holding the core is formed on the inner surface of the core protection tube portion 36. That is, by forming the core detent portion (projection 38) on the core protection tube portion 36, it is possible to hold the core even if the core becomes short, thereby enabling the core to be used effectively. It is. An eighth example will be described with reference to FIGS. This is an example in which the cylindrical portion of the slide member of the first example is formed of a member different from the slide member, and is slidable while imparting frictional resistance. More specifically, an O-ring 40 made of a rubber-like elastic body is fitted on the rear outer surface of the slide member 39.
The cylindrical member 41 is fitted on the rear of the slide member 39 in a state of being in contact with the ring 40. In this example, the O-ring 40 is formed as a separate member from the slide member. However, the O-ring 40 may be integrally formed by forming a circumferential rib or the like on the outer peripheral surface of the slide member. On the inner peripheral surface of the rear end of the cylindrical member 41, an inner flange portion 42 that comes into contact with the outer flange portion 13 of the chuck body 5 is formed. The operation is substantially the same as that of the first example, but when the core is stored, the core protection tube 12 is completely stored in the tip member 9 by abutting the core protection tube 12 on a writing surface or the like. be able to. This is because the slide member 39 to which the core protection tube 12 is fixed can slide rearward in the cylindrical member 41 against the frictional resistance of the O-ring. Reference numeral 43 denotes a regulating ring for preventing the slide member 39 from dropping off the cylindrical member 41, but is not particularly necessary when the frictional resistance of the O-ring is sufficient. When the regulating ring is not attached, the assembling and disassembly of the slide member and the tubular member become easy, and the work of reworking when the core is clogged becomes easy.

A ninth example will be described with reference to FIG. The first
This is an example in which a male screw portion 44 and a female screw portion 45 are formed on the surfaces of the outer flange 13 of the chuck body 5 and the inner flange 15 of the slide member 10 of the example. When assembling the chuck body 5 and the slide member 10, the chuck body 5 is strongly closed and assembled to the slide member 10. When disassembling the chuck body 5 and the slide member 10, if the chuck body 5 and the slide member are relatively rotated, they can be easily screwed together. It can be separated. Means in consideration of the ease of assembling and disassembling the chuck body and the slide member may have a structure as shown in FIG. 16 (tenth example) or FIG. 17 (eleventh example). FIG.
Is an example in which a slit 48 is formed in the cylindrical portion 47 of the slide member 46. The slit 48 facilitates opening and closing of the cylindrical portion 47, and facilitates assembly and disassembly of the chuck body and the slide member. Sixth
This is almost the same example as the example shown in FIG. Symbol 49
Is an inner flange portion that contacts the outer flange portion of the chuck body.
In the example shown in FIG. 17, the cylindrical portion is formed into a rod-shaped portion 50 by forming the slit 47 further larger, and the concave portion 5 is formed in an intermediate portion of the slide member 46.
In this example, a long groove for engaging with the concave portion 51 is formed on the inner surface of the tip member. When the tip member and the shaft main body are separated from each other, the slide member is also pulled by the chuck body and tends to come off from the tip member. The spreading action acts on the arm portion 50 of 46, thereby expanding the arm portion, and as a result, the slide member and the chuck body are separated. In the event that the core is broken in the slide member, maintenance becomes easy.

A twelfth example will be described with reference to FIGS. The description of the same configuration as the first example is omitted.
An O-ring 52 made of a rubber-like elastic body or the like that is in sliding contact with the inner surface of the tip member 9 is press-fitted on the outer peripheral surface of the slide member 10. May be. The sliding resistance of the sliding member 10 against the tip member 9 is set to be larger than the sliding resistance of the lead on the lead detent member 11.
That is, as will be described later, when the residual core A is to be pushed out by the subsequent lead B, the slide member 10 is also pushed out, but the sliding resistance with the tip member 9 is strong, and as a result,
The slide member 10 remains stationary, and the residual core A is pushed out. Here, the chuck body 5 is divided into two or three.
It is a so-called collet-type chuck composed of split or quartered chuck pieces. 5 outer surface flange 13
Has a structure that escapes. That is, the chuck body 5 and the slide member 10 can be separated and assembled. Further, in front of the inner surface of the tip member 9, the intermediate step 17 of the slide member 10 abuts, and the slide member 1
An inner surface step 18 for regulating the amount of advance of zero is formed.

Next, the operation will be described. 18 to 20 show a state in which the residual core A separated from the chuck body 5 is held by the center detent member 11, and the subsequent core B is gripped by the chuck body 5. When the lead tank 2 is pressed forward from this state, the chuck body 5 moves forward together with the chuck ring 6 in the tubular portion 14 in a non-contact state, and the trailing lead B gripped thereby also moves forward. The subsequent core B
The remnant core A is pushed with the advance of. The remnant core A also tries to advance, but since the remnant core A is held by the detent member 11,
The slide member 10 also tries to move forward. However, since the sliding resistance of the sliding member 10 against the tip member 9 is set to be larger than the sliding resistance of the core against the center detent member 11, the sliding member 10 is kept stationary. The residual core A moves forward and projects from the tip of the slide member 10 (the tip of the core protection tube 12). By the way, when the above-mentioned sliding resistance reverses, the slide member 10 advances first, and then the lead is delayed and the slide member 1 is moved.
Since it protrudes from the leading end of the zero, it becomes uncomfortable. Then, when the chuck body 5 and the chuck ring 6 are further advanced, the front end of the chuck ring 6 comes into contact with the rear end face of the slide member 10 and the advance movement of the chuck ring 6 is prevented (see FIG. 21). . But,
Since the chuck body 5 is still advanced, the chuck body 5 is released from the chuck ring 6 at this time, and the gripping of the subsequent lead B by the chuck body 5 is released. Here, when the chuck body 5 further moves forward and its front end contacts the inner surface step 10a of the slide member 10, this time,
The chuck member 5 advances the slide member 10. At this time, since the residual core A is lightly held by the core detent member 11, it advances as the slide member 10 advances, but the trailing core B is released from the chuck body 5 and falls by its own weight. As described above, the robot advances while maintaining the contact state with the residual core A (see FIG. 22). Eventually, when the intermediate step 16 of the slide member 10 comes into contact with the inner step 17 of the tip member 9, the forward movement of the slide member 10 is regulated (see FIG. 23).

By these operations, the wick (the following wick B and
Since the remnant core A) and the core protection tube 12 fixed to the slide member 10 advance with respect to the tip member 9, the protruding length of the tip member 9 from the tip becomes larger than in the initial state. Here, when the forward movement of the lead tank 2 is released, the chuck body 5 moves backward while the trailing lead B is released, and the outer surface flange portion 13 moves backward in the cylindrical portion 14 without contact. When the contact resistance between the slide member 10 and the tip member 9 is made larger than the contact resistance between the slide member 10 and the slide member 10, the slide member 10 may be moved in a contact state. That is, the chuck body 5 may be moved backward while the slide member 10 is stationary. When the outer flange 13 of the chuck body 5 comes into contact with the inner flange 15 of the slide member 10 during this retreating process,
The slide member 10 retreats, but slightly later, the chuck body 5 is closed by the chuck ring 6 and again grips the trailing core B (see FIG. 24). And
By these operations, the residual core A is lightly held by the lead holding member 11 of the slide member 10, so that the residual core A retreats with the slide member 10 while maintaining the projected state of the residual core A, and
Since the trailing core B is held by the chuck body 5, the trailing lead B moves backward with the backward movement of the chuck body 5. Although the subsequent core B and the residual core A are retracted by the above-described operation, the trailing core B and the residual core A are retracted with respect to the leading member 9 together with the slide member 10, and thus are retracted with respect to the core protection tube 12 (slide member 10). Not
Therefore, the length of protrusion from the core protection tube 12 does not decrease (see FIG. 25). Also, the slide member 10
Is pressed into the inner surface of the tip member 9 by the O-ring 52 and is kept in the retracted position even after the pressing operation is released. There is no possibility that a gap is formed between the core and the residual core A.

A thirteenth example will be described with reference to FIGS. 26 and 27. The description of the same configuration as the first example is omitted.
Between the rear end of the slide member 10 and the connecting member 8, a resilient member 53 such as a coil spring is stretched.
The slide member 10 is urged forward. Then, the urging force of the elastic member 53 for urging the slide member 10 forward is such that the chuck body 5 expands, and the outer surface flange portion 13 becomes the cylindrical portion 14 of the slide member 10.
It is larger than the sliding contact force when sliding on the inner surface. That is, the sliding member 10 is
Irrespective of the sliding contact with the inner surface 14 of the cylindrical portion or the loose insertion, it is always urged forward to move. It should be noted that a chuck body in which the outer flange portion of the chuck body does not contact the inner surface of the cylindrical portion of the slide member may be used. In particular, in the case of a resin-made chuck body, consideration is given to the deterioration of the elastic force over time. Therefore, it is common to increase the amount of expansion, and therefore, it comes into contact with the inner surface of the cylindrical portion of the slide member. Here, it is conceivable to increase the inner diameter of the cylindrical portion so that the outer surface flange portion of the chuck body does not contact the inner surface of the cylindrical portion. Not only will they become larger,
If the lead is slightly bent or short due to a large expansion amount, the lead is gripped at a position away from the lead gripping portion of the chuck body (see FIG. 28), and the lead is unwound. In some cases, this would cause trouble. Therefore, in the present embodiment, the cylindrical portion of the slide member is made small, and the outer flange portion of the chuck body is brought into contact with the inner surface of the cylindrical portion to regulate the amount of expansion, and the core is held at the regular gripping portion. To hold it.

Next, the operation will be described. The advancing operation of the chuck body and the slide member will not be described because the operation is the same as in the first and twelfth examples. When the forward movement of the core tank 2 is released, the chuck body 5 is retracted while the outer flange portion 13 is rubbed against the inner surface of the cylindrical portion 14 in a state where the chuck body 5 is expanded. Since the member 10 is urged forward by the elastic member 53, the slide member 10 does not retreat. Eventually, the outer flange 13 of the chuck body 5 comes into contact with the inner flange 15 of the slide member 10, and at this time, the retreat operation of the slide member 10 is started (see FIG. 29). Of course, this is against the elastic force of the elastic member 53. The chuck body 5 is closed by the chuck ring 6 and grips the trailing core B again. At this time, in a state where the trailing core B is gripped, the chuck body 5 is slightly retracted similarly to the related art. There is no such thing as. Although the following lead B and the remaining lead A are retracted by the above-described operation, the trailing lead B and the residual lead A are retracted with respect to the leading member 9 together with the slide member 10.
It does not recede with respect to the core protection tube 12 (slide member 10), so that the protrusion length from the core protection tube 12 does not decrease. Further, since the slide member 10 is engaged with the outer surface flange portion 13 of the chuck body 5, the retreat position is maintained even after the pressing operation is released. There is no possibility that a gap is formed between the trailing core B and the residual core A by dropping. In the above example, the resilient member and the slide member are formed as separate members and assembled. However, as shown in FIGS. 30 and 32, the elastically deformable portion is integrally formed behind the slide member by injection molding or the like. It may be formed. More specifically, the elastically deformable portion of the present example will be described. A tubular portion 55 is formed behind the slide member 54,
An elastically deformable mesh-like elastic deformation portion 56 is formed at the rear of the tubular portion 55.

FIG. 31 shows an example in which the slide member 54 is formed of a resin material by means such as injection molding, and the chuck body 57 is also formed of a resin material. As described above, when the resin-made chuck body 57 is in the expanded state, the outer peripheral surface thereof has the cylindrical portion 5 of the slide member 54.
5 is in contact with the inner peripheral surface thereof, and its expansion amount is regulated. Specifically, the expansion amount is slightly smaller than the diameter of the core. Of course, this is for gripping the core at a regular position. In this example, the elastically deformable portion is formed behind the slide member. However, a tension spring may be provided in front of the slide member. You may rush.

A fourteenth example will be described with reference to FIGS. A lead tank 59 is disposed inside the shaft body 58 so as to be movable back and forth, and an openable and closable chuck body 60 is fixed to the front end of the lead tank 59. A chuck ring 61 for opening and closing the chuck body 60 is surrounded in front of the chuck body 60. A base 62 a having a clip 62 formed therein is press-fitted and fixed to a rear portion of the shaft main body 58.
An eraser 63 is detachably attached. Code 6
A knock cap 4 covers the eraser 63,
It is detachably attached to the rear part of the core tank 59. On the other hand, a tip member 65 is detachably fixed to the tip of the shaft main body 58 by means such as screwing. It is attached so as not to come off easily by a grip 66 made of. A slide member 67 is disposed inside the tip member 65 so as to be able to move back and forth. Inside the slide member 67, a core is held lightly and a detent is formed of a rubber-like elastic body or a resin molded product. Member 6
8 is press-fitted, the core detent member may be made of a rubber-like elastic body smaller than that in the illustrated example, and a core guide member made of a resin molded product may be attached to the back of the small detent member. Reference numeral 69 denotes a core protection tube portion, which is integrally formed at the tip of the slide member 67, but may be formed by a metal pipe or the like and press-fitted and fixed. Sign S
Is a repelling member such as a coil spring for urging the chuck body 60, the core tank 59 and the like backward.

Next, the chuck body 60 and the slide member 67 will be described in detail. A projection 70 is formed on the outer surface of the front end of the chuck body 60 at a position facing the projection 70.
A cylindrical portion 71 is formed at the rear of the slide member 67 so as to extend therethrough. An engaging hole through which the protrusion 70 of the chuck body 60 is loosely inserted is formed in an intermediate portion of the cylindrical portion 71. 72
Are formed (FIG. 35A). Further, the cylindrical portion 7
1 The rear inner surface has an inclined surface 7 that is sequentially inclined forward.
3 (see FIG. 36), and the chuck body 60 is formed.
Is easily inserted into the engagement hole 72.
That is, assembly of the chuck body 60 to the slide member 67 is easy. A resilient member 74 such as a coil spring is stretched between the rear end of the slide member 67 and the shaft main body 58 to urge the slide member 67 forward. Then, the urging force of the elastic member 74 for urging the slide member 67 forward is such that the chuck body 60 expands, and the edge 75 other than the protrusion 70 becomes the cylindrical portion of the slide member 67. The sliding contact force is larger than the sliding contact force when the sliding contact is made with the inner surface of the base 71. That is, the slide member 67 is connected to the edge 75 of the chuck body 60.
Regardless of the sliding contact or non-sliding contact with the inner surface of the cylindrical portion 71,
It is urged forward to move. Here, the chuck body 60 is divided into two or three or
The so-called, composed of four divided chuck pieces,
It is a collet type chuck. Further, an intermediate step 76 of the slide member 67 is formed in front of the inner surface of the tip member 65, and an inner step 77 for regulating the amount of advance of the slide member 67 is formed. Next, a method of assembling the chuck body 60 to the slide member 67 will be described. With the core not being gripped (from the state shown in FIG. 37), the chuck body 6
When the zero protrusion 70 is pressed against the rear end of the slide member 67 (tubular portion 71) and pushed in, the head of the chuck body 60 is reduced in diameter by the inclined surface 73 (see FIG. 38). Reaches the engagement hole 72, at which time the chuck body 60
Is released, and the head of the chuck body expands.
Here, at the same time when the projection 70 of the chuck body 60 is loosely inserted into the engagement hole 72, it becomes difficult to separate (the state shown in FIG. 33).

Next, the center detent member 68 will be described in detail. The core detent member 68 has a core insertion hole 68a which is slightly larger than the diameter of the core to be used but is not inserted into the core detent member 68 over the entire length. A center detent portion 68b having a diameter slightly smaller than the diameter of the core to be used is formed at a front portion of the core insertion hole 68a.
The center detent portion 68b is a portion that holds the core lightly and prevents the core from retreating. In the state where the lead is held by the lead detent portion 68b, the lead is held by the ridge line, so that the rotation of the lead during writing by the residual lead can be prevented as much as possible.
The core insertion hole 68 a is formed at a position where a groove 68 c having a width smaller than the diameter of the core used in the axial direction is opposed, and the groove 68 c extends over the entire length of the core detent member 68. It is formed. Further, near the center detent portion 68b, the groove 68c is formed up to the outer peripheral edge of the center detent member 68. That is, the groove 68c near the center detent portion 68b has a slit shape penetrating therethrough. An elastic action is imparted to the core detent portion 68b that holds the core, thereby absorbing variations in the core diameter. The grooves 68c are formed at two opposing positions in this example, but may be formed at three or four positions radially, or may be formed as triangular grooves.
A conical portion 68d is formed above the core insertion hole 68a. The core is easily introduced into the core insertion hole 68a. The center detent member 68 is formed of a resin material. The position of the gate (hole into which the resin enters the cavity) at the time of injection molding is in the direction perpendicular to the axis of the core insertion hole 68a, and is the portion where the groove 68c is formed. (FIG. 35B,
35C). By pouring the resin from the direction in which the strength of the core pin is strong, the bending and breakage of the core pin due to the inflow pressure of the resin is prevented as much as possible. The groove 68c also has a role of absorbing dimensional variations and maintaining an appropriate fixing strength when press-fitting and fixing the center detent member 68 to the slide member 67. That is, the groove 68
The elastic deformation of the center detent member 68 due to c is utilized. In this example, the core insertion hole 68a and the core detent portion 68b are integrally formed. (For example, the example shown in FIG. 53).

Next, the operation will be described. 33 and 34 are states in which the residual core A separated from the chuck body 60 is held by the center detent member 68, and the subsequent core B is gripped by the chuck body 60. The slide member 67 is urged forward by the repelling member 74, but the rear end of the engagement hole 72 of the tubular portion 71 abuts and engages with the projection 70 of the chuck body 60. Therefore, the forward movement (of the slide member 67) is restricted. When the lead tank 59 is pressed forward from this state, the chuck body 60 moves forward together with the chuck ring 61 in the cylindrical portion 71 without contact.
Is urged, the slide member 67 also moves forward while maintaining the engagement state of the engagement hole 72 and the projection 71.
As a result, the subsequent core B held by the chuck body 60
Also, the residual core A held by the core detent member 68 advances together with the slide member 67. Eventually, the slide member 6
The intermediate step 76 of 7 contacts the inner step 77 of the tip member 65, and its forward movement is prevented (see FIG. 39). However, since the projection 70 of the chuck body 60 is loosely inserted into the engagement hole 72, the chuck body 60 and the chuck ring 61, and the subsequent lead B and the residual lead A still advance, The chuck ring 61 is connected to the slide member 67.
When the cylindrical portion 71 comes into contact with the rear end portion, the movement of the cylindrical portion 71 is stopped. Then, at this time, the chuck body 60 expands,
The trailing core B is released, and the edge 7 of the chuck body 60 is released.
5 comes into contact with the inner surface of the cylindrical portion 71 of the slide member 67 (see FIG. 40).

Here, when the forward movement of the lead tank 59 is released, the edge portion 7 of the chuck body 60 is opened in the expanded state.
Although the slide member 67 on which the cylindrical portion 71 is formed is urged forward by the repelling member 74, the slide member 67 does not retreat, although the slide member 67 formed with the cylindrical portion 71 is urged forward. . Eventually, the protrusion 70 of the chuck body 60
When it comes into contact with the rear end of the engagement hole 72 of the slide member 67, the retreat operation of the slide member 67 is started (FIG. 4).
1). Of course, this is against the elastic force of the elastic member 74. Eventually, the chuck body 60 is closed by the chuck ring 61 and grips the trailing core B again (FIG. 4).
2). At this time, in a state where the trailing core B is gripped, the chuck body 60 is slightly retracted similarly to the related art. There is no such thing as. Although the subsequent core B and the residual core A are retracted by the above-described operation, the trailing core B and the residual core A are retracted with respect to the leading member 65 together with the slide member 76. Therefore, the protrusion length from the core protection tube portion 69 does not decrease. In addition, the slide member 67
As in the above examples, since it is engaged with the projection 70 of the chuck body 60, the retracted position is maintained even after the pressing operation is released.
There is no possibility that a gap is formed between the core and the residual core A. In the above example, the resilient member and the slide member are configured as separate members and assembled, but as shown in FIG. 43, an elastically deformable portion is integrally formed behind the slide member by injection molding or the like. Is also good. Explaining concretely the elastically deformable portion of this example, a stretchable mesh-like elastically deformable portion 79 is formed behind the slide member 78.

A modification will be described with reference to FIG. An engagement hole 82 is formed in the cylindrical portion 81 of the slide member 80,
This is an example in which a slit 83 narrower than the projection 70 of the chuck body 60 is formed. An inclined surface 84 is formed on the rear end surface of the cylindrical portion 81 so that the protrusion 70 can be easily mounted in the engagement hole 82. Projection 7 of chuck body 60
When 0 is pressed against the inclined surface 84, the cylindrical portion 81 is elastically deformed around the slit 83 (see FIG. 45), and the protrusion 70 is easily guided into the engagement hole 82. An inner inclined surface 85 is formed on the inner surface of the engagement hole 82 at a position facing the inclined surface 84. The inner inclined surface 85 allows the chuck body 60 and the slide member 67 to be separated from each other. That is, if the core is broken in the slide member, the maintenance is easy. A modification of the engagement hole will be described with reference to FIG. An engagement hole 88 is formed in the cylindrical portion 87 of the slide member 86 as in the previous example.
, An L-shaped guide groove 89 is formed. The end of the guide groove 89 is formed up to the end of the cylindrical portion 87. That is, in this example, when assembling the chuck body to the slide member, the chuck body and the slide member are assembled while rotating relatively (FIG. 47).
reference). By adopting such a configuration, assembly becomes easier, and even if the core is broken in the slide member, the chuck body and the slide member can be easily disassembled and maintenance can be performed. It is easy.

In this embodiment, since the amount of protrusion of the chuck body from the chuck ring is small and there is a distance where the resilient member comes into close contact with the chuck body, the state in which the chuck body is slightly advanced by pressing the knock cap is provided. However, if the chuck body is formed long, the slide member can be assembled without advancing the chuck body. In the above example, since the engaging portion is formed as a through hole, the processing is easy. Particularly, when the slide member is formed by injection molding, the mold can be manufactured at low cost.
Also, dimensional accuracy can be assured. Also, the chuck body 6 is provided on the front end face of the chuck body of this embodiment.
A fan-shaped bulge 90 along the shape of 0 is formed (see FIGS. 48 and 49). The fan-shaped bulging portion 90
This is a pressing portion when the chuck body 60 is pressed into the core tank 59. The specific press-fitting method will be described later in detail. In this embodiment, the bulging portion is a fan-shaped projection. However, as shown in FIG. 50, a central portion on the circumference of the front end face of the chuck body 60 may be raised in a mountain shape. Further, as shown in FIG. 51, the front end face of the chuck body 60 may be formed to extend in the longitudinal direction from the projection 70 toward the front.

Next, a method of assembling the chuck body 60 to the core tank 59 will be described with reference to FIG. First, the core tank 59 is set up, and the repellent member S is positioned from above (front).
Into the core tank 59. Next, the shaft main body 58 is mounted so as to cover the core tank 60 from above. Next, the chuck ring 61 is placed above the shaft main body 58, and the chuck body 60 of this embodiment is inserted. Then
The pressing member 91 is brought into contact with the bulging portion 90 of the chuck body 60 to apply a force to the pressing member 91. Of course, it is a downward force. As a result, the chuck body 60 is
0 receives the force from the pressing member 91. With this force, the lower part of the chuck body 60 is pressed into the core tank 59. At this time, the chuck member 60 is
When an excessive force acts on the chuck body 60, the bulging portion 90 formed at the front end of the chuck body 60 is deformed outward or inward, and deformation of the front part of the chuck body is prevented. That is, it is possible to assemble while maintaining the correct shape without bulging the front portion of the chuck body inscribed in the chuck ring 61. In the above-described embodiment, the protrusion 70 is formed on the front outer peripheral portion of the chuck body 60, and the protrusion 70 is engaged with the slide member 67. Gap is eliminated. That is, the shape of the projection 70 is a very important component. Therefore, if the projection 70 is deformed, the retreat position of the slide member 67 and the like vary, and as a result, the centering length (the extension length of the slide member) also varies. If it does, the protrusion 70 may be damaged, and there is a risk that the slide member 67 cannot be retracted. In order to prevent such a situation, it is preferable to form the bulging portion 90.

A fifteenth example will be described with reference to FIGS. 53 and 54. The same components as those in the fourteenth example are denoted by the same reference numerals. A lead tank 59 is disposed inside the shaft body 58 so as to be movable back and forth, and an openable and closable chuck body 60 is fixed to the front end of the lead tank 59. A chuck ring 61 for opening and closing the chuck body 60 is surrounded in front of the chuck body 60. Also, a resilient member S such as a coil spring for urging these members rearward,
It is stretched between the core tank 59 and the inner step 93 of the barrel 58. The core tank 59, the chuck body 60, the chuck ring 61, the repellent member S, and the like constitute a core feeding means 94 of the present invention. A tip member 65 is detachably fixed to the front portion of the shaft main body 58 by means such as screwing. It is installed internally. Then, the slide member 67
A guide member 95 for guiding the lead and a lead detent member 96 made of an elastic material such as silicone rubber or NBR for holding the lead lightly in front of the guide member 95 and preventing the lead from retreating are disposed inside the guide member 95. However, the guide member and the center detent member 96 may be integrally formed with the tip member. Further, a tubular portion 71 is formed at the rear of the slide member 67, and an engaging hole 72 is formed at a position facing the tubular portion 71. Further, a slit is formed in the tubular portion 71 in connection with the engaging hole 72, and when an external action is applied to the tubular portion 71, the tubular portion 71 can be expanded by an elastic deformation force. . Then, the engagement hole 72
A protrusion 70 formed on the front outer periphery of the chuck body 60 is loosely inserted into the hole. Note that a step 97 is formed behind the inner surface of the tip member 65. The step portion 9 is a regulating portion for preventing the chuck ring 61 from moving forward.
When the chuck ring 61 comes into contact with the chuck body 7, the chuck body 60
Is opened to release the gripping core.

Here, the chuck ring 61 is connected to the step 9
7 is set smaller than the distance W until the protrusion 70 of the chuck body 60 contacts the front end of the engagement hole 72 of the slide member 67. That is,
The chuck ring 61 comes into contact with the step portion 97, and the chuck body 6
The projection 70 of the chuck body 60 comes into contact with the front end of the engagement hole 72 after the expansion of the opening 0. More specifically, the distance V is set to be shorter than the distance W by about 0.1 mm, but if the difference is about 0.05 mm to 1.0 mm, the distance V functions sufficiently. By the way, 1.0
Although it functions even with mm, the protrusion amount of the lead increases, and adjustment of the protrusion amount of the lead later becomes troublesome. Also, the vicinity of the cylindrical portion 71 of the slide member 67 and the shaft body 5
8, a gap X is formed.
Is set smaller than the fitting distance Y between the chuck body 60 and the slide member 67. That is, when the protrusion 70 of the chuck body 60 is loosely inserted (assembled) into the engagement hole 72 of the slide member 67, the cylindrical portion 71 near the engagement hole 72 expands. After assembling, the expansion of the cylindrical portion 71 is restricted, and the loosely inserted state of the protrusion 70 and the engagement hole 72 is maintained. That is, the protrusion 70
Does not come out of the engagement hole 72. Further, the slide member of the present example is a slide member having a slit 83 as shown in the modification of the above-described fourteenth example, and the width of the slit is, for example, when the slide member is mounted on the tip member. Even if the slit is widened, the protrusion of the chuck body has a width that does not come off. That is, the difference between the width of the protrusion of the chuck body and the width of the slit is larger than the difference between the inner diameter of the tip member and the outer diameter of the cylindrical portion of the slide member.

Reference numeral 98 denotes an inner rib 6 of the tip member 65.
An O-ring made of a rubber material or the like interposed between 5a and the slide member 67, and the O-ring 98 provides sliding resistance. The sliding resistance of the sliding member 67 against the tip member 65 is set to be larger than the sliding resistance of the lead against the lead detent member 96. That is, even if the lead advances with the chuck body 60, the movement of the slide member 67 with respect to the tip member 65 is restricted. Incidentally, the core holding force of the core detent member is 20
gf to 100 gf is a suitable value. If the value is smaller than this value, there is a risk that the wick may slide down. In addition,
In this example, the O-ring 98 is slid on the inner rib 65a formed on the tip member 65. However, the O-ring 98 may be slid on the cylindrical inner surface instead of the inner rib. Considering the compression of air due to sliding and the like, it is preferable to use a rib shape. A base 62 a having a clip 62 formed thereon is press-fitted and fixed to the rear of the shaft main body 1, and an eraser 6 is mounted to the rear of the core tank 59.
3 is detachably attached. Reference numeral 64 denotes a knock cap for covering the eraser 63, which is detachably attached to the rear portion of the core tank 59. on the other hand,
A grip member 66 made of a rubber material or the like is mounted in front of the shaft cylinder 58. The grip member 66 is mounted so as to straddle the concave portion 58a formed in the barrel 1 and the concave portion 65b formed in the tip member 65. Tip member 6
5 can be grasped with a finger up to the front. This configuration is the same as the fourteenth example.

Next, the operation will be described. The state shown in FIG. 53 is a state in which the residual core A separated from the chuck body 60 is held by the core detent member 96, and the subsequent core B is gripped by the chuck body 60. Also, the slide member 67
Is pulled rearward by the chuck body 60 protrusion 70. When the lead tank 59 is pressed forward from this state, the chuck body 60 together with the chuck ring 61, the subsequent lead B gripped by the chuck body 60, and the residual lead A pushed by the subsequent lead B advance. . At this time, since the residual core A is lightly held by the core detent member 96 of the slide member 67, the slide member 67 also tries to move forward, but the sliding resistance force of the slide member 67 against the tip member 65 is set large. As a result, the slide member 67 does not move, and the residual core A slides in the detent member 96,
It protrudes from the tip of the slide member 67. Eventually, the chuck ring 61 comes into contact with the step portion 97 of the tip member 65, and its forward movement is restricted. At this time, a gap Z is formed between the protrusion 70 of the chuck body 60 and the front end of the engagement hole 72 of the slide member 67 (see FIG. 55). here,
When the lead tank 59 further moves forward, the chuck body 60 slightly advances the succeeding lead B (as well as the residual lead A) while bringing the projection 70 of the chuck body 60 into contact with the front end of the engagement hole 72 (FIG. 56). At this time, the chuck body 60 expands and releases the grasped subsequent core B, but the moment the chuck ring 61 comes into contact with the step portion 97, the chuck body 60 is opened.
May be expanded.

When the lead tank 59 further moves forward, the protrusion 70 of the chuck body 60 moves the slide member 67 forward. Eventually, the intermediate step portion 76 of the slide member 67 comes into contact with the rear end portion 65b of the inner rib 65a of the front member 65, and its forward movement is prevented (see FIG. 57). Here, when the forward movement of the lead tank 59 is released, the chuck body 60 retreats in an expanded state, but the slide member 67 does not retreat because the resistance is given by the O-ring 98. When the protrusion 70 of the chuck body 60 comes into contact with the rear end of the engagement hole 72 of the slide member 67 (see FIG. 58), the retreat operation of the slide member 67 is started. Eventually, the chuck body 60 is closed by the chuck ring 61 and grips the subsequent core B again (see FIG. 53). At this time, in a state where the trailing core B is gripped, the chuck body 60 is slightly retracted similarly to the related art. There is no such thing as. As described above, the trailing core B and the residual core A are retracted, but are retracted with respect to the leading member 65 together with the sliding member 67. There is no reduction in the length of protrusion from the tip of the 67.
Further, the engagement hole 72 of the slide member 67 is
Since it is engaged with the protruding portion 70, the retracted position is maintained even after the pressing operation is released, and the gap is formed between the trailing core B and the residual core A by dropping under its own weight. There is no such thing as. As described above, in this embodiment, after the chuck ring 61 is brought into contact with the step portion 97,
After the chuck body 60 is expanded, the projection 70 of the chuck body 60 is brought into contact with the front end of the engagement hole 72, so that the chuck body 60 can be expanded without any restriction, Thus, a comfortable chucking sound of the chuck ring can be obtained.

A sixteenth example will be described with reference to FIG. This is an example in which the cylindrical portion of the slide member 67 is formed by another member.
A window hole 100 is also formed in the tubular member 99 in this example, and the projection 70 of the chuck body 60 is loosely inserted into the window hole 100. Further, the cylindrical member 99 is press-fitted and fixed to the main body of the slide member, and the press-fitting distance can be arbitrarily set at the time of assembly. The operation is the same as that of the fifteenth example, and a description thereof will be omitted. However, in this example, since the press-fitting distance of the cylindrical member 99 with respect to the main body of the slide member can be changed, the dimensional variation of the product and the core The protruding length can be set by a press-fit distance of the cylindrical portion to the slide member. As described above, in the fifteenth and sixteenth examples, in a normal state, the rear end of the slide member is located forward of the stepped portion 97 of the front member 65, and the rear end of the slide member is located between the rear end of the slide member and the front surface of the chuck ring. , A gap may be formed between the rear end of the slide member and the front surface of the chuck ring while the rear end of the slide member is positioned behind the step of the front member. . In short, it is only necessary that there is a gap that allows the slide member to retreat while the chuck body grips the subsequent core. If there is no gap, the chuck body cannot be retracted by the writing pressure, and as a result, the wedge effect of gripping the core is weakened, and the core is retracted by the writing pressure.

Here, an example of a mold apparatus for accurately molding the chuck body will be described. This will be described with reference to FIGS. Inside the mold 101, a plurality of divided cavities 102 forming the outer shape of the chuck body 60, and core pins 103 forming the inner shape of the chuck body 60 are arranged. The plurality of divided cavities 102
Is a cavity 102a forming a rear portion 60a and a front portion 60c of the chuck body 60, and a cavity 102b forming an inclined surface 60b with which the chuck ring 61 contacts.
It is composed of More specifically, in the portion where the inclined surface 60b of the cavity 102a is formed,
A through hole 102d is formed, and the through hole 102d is formed.
The cavity 102b that forms the inclined surface 60b is filled in (see FIG. 62 in particular). That is, at least only the cavity 102b forming the inclined surface 60b of the chuck body 60 can be replaced. When the angle of the inclined surface 60b of the chuck body 60 and the outer shape of the inclined surface 60b are to be finely adjusted,
Only the cavity 102b may be removed, and only that portion may be modified or reworked. In the above example, the cavities forming the rear portion 60a and the front portion 60b of the chuck body 60 are integrated, but may be formed separately as shown in FIG. Specifically, the chuck body 60
Cavities 102a forming the rear portion 60a, cavities 102b forming the inclined surfaces 60b, and cavities 102c forming the front portions 60c. That is, the cavity 102a of the previous example is divided into two. In the example in which the chuck body and the slide member are interlocked as in the above example, the timing at which the chuck body retreats and the slide member retreats and the timing at which the chuck body is closed by the chuck ring are extremely important. It becomes something. Therefore, accuracy of the inclined surface of the chuck body is required. Therefore, if the chuck body using the mold described above is used, the inclined surface of the chuck body can be easily and accurately adjusted at low cost.

A seventeenth example will be described with reference to FIGS. 64 and 65. This is an example in which a lead gripping mechanism is provided at the tip of the slide member. A lead tank 105 is disposed inside the shaft main body 104 so as to be movable back and forth, and a first chuck body 106 that can be opened and closed is fixed to a front end of the lead tank 105. A chuck ring 107 for opening and closing the first chuck body 106 is surrounded by a front portion of the first chuck body 106. Further, a tip member 108 is detachably fixed to the tip of the shaft main body 104 by means such as screwing, but the tip member 108 may be formed integrally with the shaft main body 105. A second chuck body 1 that can be opened and closed similarly to the first chuck 106 is provided inside the tip member 108.
Reference numeral 09 is arranged so as to be able to move back and forth, and a core holding portion 111 for holding the core lightly is provided integrally or separately on the inner surface of the core holding portion 110 of the second chuck body 109. That is, when the second chuck body 109 is completely closed, the core is strongly gripped, and when the second chuck body 109 is expanded, the core is lightly held. In the case of being provided integrally, means such as embossing the inner surface of the core holding portion 110 or making a tap may be used.
When it is provided as a separate member, means such as attaching an elastic body such as silicone rubber or NBR may be used. The front portion of the second chuck body 109 protrudes from the front end of the tip member 108, and the front end portion of the front member 108 serves as a chuck ring 112 for opening and closing the second chuck body 109. Reference numeral S denotes a repelling member such as a coil spring for urging the first chuck body 106, the core tank 105, and the like rearward. Next, the first chuck body 106 and the second chuck body 109 will be described in detail. On the outer periphery of the front end of the first chuck body 106,
An outer flange 113 is formed. Further, a cylindrical portion 114 is formed to extend behind the second chuck body 109, and the inner surface of the rear end of the cylindrical portion 114 is in contact with the outer flange 113 of the first chuck body 106. Inner flange 115
Are formed. On the other hand, an intermediate step 116 is formed on the front outer periphery of the second chuck body 109 so as to be able to abut on an inner step 117 formed on the inner surface of the tip member 108. Here, the first chuck body 106
Is a so-called collet-type chuck constituted by split, split or split chuck pieces. When the core is firmly closed without holding the core, the second chuck The outer flange 113 of the first chuck body 106 comes off from the inner flange 115 of the body 109. That is, the first chuck body 106 and the second chuck body 109 can be separated and assembled.

Next, the operation will be described. In the state of FIG. 65, the residual core A separated from the first chuck body 106 is gripped by the second chuck body 109. In addition, the subsequent core B is being held by the first chuck body 106. When the lead tank 105 is pressed forward from this state, the first chuck body 106 moves forward together with the chuck ring 107, and the subsequent lead B gripped thereby also moves forward. The remnant core A is pushed along with the advance of the subsequent core B, and the remnant core A also attempts to move forward.
The second chuck body 109 moves forward together with the residual core A because the second chuck body 109 is gripped by zero and the inner flange 115 of the second chuck body 109 is in contact with the outer surface of the first chuck body 106. At this time, if the second chuck body 109 advances a little, the second chuck body 109 expands.
11, the second chuck body 109 also advances by the advance of the residual core A. Here, when the intermediate step 116 of the second chuck body 109 comes into contact with the inner step 117 of the tip member 108, the forward movement of the second chuck body 109 is restricted.

When the lead tank 105 is further advanced, the residual lead A moves forward while sliding on the lead holding portion 111 of the second chuck body 109, which is prevented from moving, while being pushed by the trailing lead B. , Protruding and extending from its tip. Eventually, the chuck ring 107 comes into contact with the rear end of the second chuck body 109, and its forward movement is restricted.
The first chuck body 106 expands to release the subsequent lead B (see FIG. 66). Here, when the forward movement of the lead tank 105 is released, the first chuck body 106 retreats with the trailing lead B released, but in this retreating process, the first chuck body 106 is released.
The outer flange portion 113 of the inner chuck portion 1 of the second chuck body 109
15 and also retracts the second chuck body 109.
At this time, the residual core A is in contact with the core holding portion 1 of the second chuck body 109.
11, it retreats with the second chuck body 109 while maintaining the residual core A in the protruding state, and also retracts the subsequent core B released from the first chuck body 106 (FIG. 67). Eventually, the first chuck body 10
Numeral 6 is closed by the chuck ring 107 to grip and retreat the subsequent lead B. In addition, although the residual core A is retracted with respect to the leading member 108 by the above-described operation, the residual core A is retracted together with the second chuck body 109, so that the protrusion length from the second chuck body 109 is reduced. There is no.

An eighteenth example will be described with reference to FIG. Inner surface flange 12 of second chuck body 119 of first chuck body 118
This is an example in which the cone angle 121 of the outer peripheral portion with which 0 abuts is set to be larger than the conical angle 22 on the outer peripheral surface of the distal end portion of the second chuck body 119. Thus, by making the cone angles of the first chuck body and the second chuck body different,
Variations in the gripping position of each chuck body of the core to be gripped can be absorbed. That is, for example, when the first chuck body is formed of resin, the outer diameter of the first chuck body when the first chuck body is closed is reduced due to elastic fatigue over time, and as a result, the first chuck body located forward is reduced. The two chuck bodies are retracted more than the initial setting, and eventually affect the gripping force of the lead. This problem was solved by changing the cone angle of each chuck body. As an example of providing a difference in the cone angle of each chuck body, the cone angle of each chuck body in the eighteenth example may be reversed. That is, the cone angle 121 of the first chuck body 15 may be set small, and the cone angle 122 of the second chuck body 119 may be set large. The eighteenth example is particularly effective when the first chuck body is formed of a metal material and the other second chuck body is formed of a resin material. In addition, thereby, the core gripping force of the second chuck body is higher than that of the first chuck body, and an effect of preventing the runout of the core at the tip end is also generated.

Another example is shown in FIG. That is, a conical portion 125 is formed on the inner surface of the inner flange portion 124 of the second chuck body 123, and the first
This is an example in which the outer flange 127 of the chuck body 126 is abutted. And, of course, the cone angle 128 and the cone angle 129 of the second chuck body 123 are different. There are various other examples. The example shown in FIG. 70 is an example in which an expandable and contractible stitch portion 133 is formed in the intermediate portion of the cylindrical portion 132 of the second chuck body 131. A rubber-like elastic body 134 that can expand and contract may be formed by a molding technique (FIG. 71).
(See FIG. 72). Further, as shown in FIG. 73, a slit 136 is formed in the vicinity of the tip of the tip member 108, the vicinity of the tip can be expanded, and the closed position of the second chuck body can be changed, thereby holding the core. Variations in position may be absorbed.

In each of the above examples, the slide member (the second chuck body) is moved backward by the chuck body (the first chuck body). For example, there is a method in which an arm is formed forward from a core tank, and the slide member is retracted with the arm. Hereinafter, a specific description will be given based on FIGS. 74 and 75 (19th example). Inside the shaft body 137,
A core tank 138 is arranged to be able to move back and forth, and an openable / closable chuck body 139 is fixed to the front end of the core tank 138. At the front of the chuck body 139,
A chuck ring 140 that opens and closes the chuck body 139 is surrounded. A resilient member 141 such as a coil spring for urging these members rearward is stretched between the core tank 138 and the inner surface step 142 of the shaft cylinder 137. And these core tank 138 and chuck body 1
39, chuck ring 140, and elastic member 141
Thus, the lead-out means 143 of the present invention is constituted. A front member 148 is provided at the front of the shaft main body 137.
Is detachably fixed by means such as screwing,
A slide member 149 protruding from the tip of the tip member 148 is slidably provided inside. A center detent member 150 for holding the core lightly and preventing the core from retracting is disposed inside the slide member 149, but may be formed integrally with the tip member. Further, grooves 151 are formed in two opposite outer surfaces of the slide member 149 in the axial direction. The groove 151 is not formed up to the rear end of the slide member 149, but is formed only partway. That is, the locking portion 151a is formed.

On the other hand, an arm 152 is fixed at a position facing the front of the core tank 138, and an inward projection 153 is formed at the front end thereof. In this example, the arm 152 is formed as a separate component from the core tank 138, but may be formed integrally. The inward projection 153 is formed by the groove 15 of the slide member 149.
1 is slidably fitted in the first. The arm 152 is slidably fitted into a slit 155 formed in the inner diameter-reduced portion 154 of the shaft main body 137, and is prevented from oscillating or bending in the circumferential direction (particularly, the arm 152). See FIG. 75). Reference numeral 156 denotes a resilient member such as a coil spring stretched between the shaft main body 137 and the slide member 149, and constantly biases the slide member 149 forward.

Next, the operation will be described. In the state shown in FIG. 74, the residual core A separated from the chuck body 139 is held by the center detent member 150, and the subsequent core B is
This is a state where it is gripped by 39. The slide member 149 is urged forward by the repelling member 156, but the inward projection 153 of the arm 152 from the core tank 138 is in contact with the rear part of the groove 151 of the slide member 149. The forward movement (of the slide member 149) is restricted. When the lead tank 138 is pressed forward from this state, the chuck body 139 moves forward together with the chuck ring 140. However, since the slide member 149 is urged by the elastic member 156, the slide member 1
49 also advances while maintaining the engagement between the inward projection 153 of the arm 152 and the rear part of the groove 151. As a result, the subsequent lead B held by the chuck body 139 and the remaining lead A held by the lead holding member 150 advance together with the slide member 149. Eventually, the intermediate step 157 of the slide member 149 comes into contact with the inclined wall 158 of the tip member 148, and its forward movement is prevented (see FIG. 76). However, since the inward protrusion 153 of the arm 152 is loosely inserted into the groove 151 of the slide member 149, the inward protrusion 153 of the arm 152, the chuck body 139, the chuck ring 140,
Further, the trailing core B and the residual core A held by the chuck body 139 can still move forward (see FIG. 77). However, when the chuck ring 140 comes into contact with the rear end of the slide member 149, its movement is prevented. Then, at this time, the chuck body 139 expands, and the trailing core B is released (see FIG. 78).

Here, when the forward movement of the lead tank 138 is released, the chuck body 139 retreats in the expanded state, but the slide member 149 is urged forward by the elastic member 156. 149 does not retreat. When the inward projection 153 of the arm 152 abuts on the locking portion 151a of the groove 151 of the slide member 149, the slide member 149 starts to retract (see FIG. 79). Of course, it is against the elasticity of the elastic member 156. Eventually, the chuck body 139 becomes the chuck ring 1
40, the trailing core B is gripped again (see FIG. 74). At this time, in a state where the trailing core B is gripped, the chuck body 139 is slightly retracted similarly to the related art, but the sliding member 149 is also retracted.
There is no possibility that a gap is formed between the core and the residual core A. Incidentally, also in this example, the above operation causes the following lead B
And the remnant core A retreats.
Does not recede, so that the projecting length from the tip of the slide member 149 does not decrease. In addition, since the slide member 149 is engaged with the inward projection 153 of the arm 152, the slide member 149 continues to maintain the retreat position even after the pressing operation is released, and falls down by its own weight to leave the trailing core B and the rest. There is no case where a gap is formed between the core A. A modification of the nineteenth example will be described with reference to FIG. In the previous example, the arm portion is fixed to the lead tank and engaged with the slide member to be interlocked, but in this example, the slide member is interlocked by the elastic member 141. More specifically, an arm 159 bent forward is formed to extend from the rear end of the elastic member 141. The front end (inward projection 160) of the arm 159 is engaged with the locking portion 151 a of the groove 151 of the slide member 149. Since the arm portion can be formed by processing the repelling member itself, the assembling becomes easy and the device can be manufactured at low cost. The operation is almost the same as in the previous example, and the description thereof will be omitted.

A further modification is shown in FIG. 81 and will be described.
In this example, an arm 162 is extended behind the slide member 161, and the arm 162 is connected to the slit 1 of the core tank 163.
64 are slidably engaged with each other. Next, the operation will be described, but the description of the same operation as in the nineteenth example will be omitted. When the core tank 163 is pressed, the chuck body 139 and the chuck ring 140 move forward. At this time, the slide member 161 also moves forward by the repelling action of the repelling member 156. When the forward movement of the slide member 161 is prevented, only the chuck body 139 and the chuck ring 140 advance, and eventually the chuck body 139 expands. At this time, the slit 164 of the core tank 163
Moves forward with respect to the inward projection 165 of the arm 162. Here, when the pressing operation of the lead tank 163 is released, not only the lead tank 163 but also the chuck body 139 starts retreating. At this time, although the slide member 161 does not retreat by the repelling member 156, the inward projection 165 abuts on the front portion of the slit 164 of the core tank 163, and the slide member 161 is also retracted by the abutment. .

A twentieth example will be described with reference to FIG. This is an example in which the present invention is applied to a side knock mechanical pencil. The rear part of the shaft main body 166 is the core tank part 1 for storing the core.
Although it is 67, it may be extended and formed behind the core feeding means described later. Further, a tapered slide 168 is disposed in the front inside of the shaft main body 166 so as to be movable back and forth, and an openable / closable chuck body 169 is fixed to a front end of the tapered slide 168. A chuck ring 170 for opening and closing the chuck body 169 is surrounded in front of the chuck body 169. In addition, at the rear end of the tapered slide 168, the core tank portion 167 is provided.
The core receiving member 171 that separates a plurality of cores from each other is fixed or integrally formed, but the inner diameter of the core insertion hole 172 of the tapered slide 168 is larger than the diameter of the core to be used. I have. The curvature of the taper slide and the insertion failure of the lead due to the curvature of the lead which occur at the time of molding are prevented. The tapered slide 1
A repelling member 173 such as a coil spring for urging the 68 or the chuck body 169 or the like backward is stretched between the tapered slide 168 and the inner surface step 174 of the shaft main body 166. The taper slide 168, the chuck body 169, the chuck ring 170, the repelling member 173, and the like constitute the lead-out means 175 of the present invention. Also, at the front of the shaft body 166,
A tip member 176 is detachably fixed by means such as screwing, and a slide member 178 projecting from the tip of the tip member 176 is slidably provided inside. A center detent member 179 for holding the core lightly and preventing the core from dropping is disposed inside the slide member 178, but may be integrally formed with the slide member 178.

On the other hand, an inclined surface 180 is formed on the outer surface of the intermediate portion of the tapered slide 168. Also,
An arm 181 is fixed to a rear portion of the slide member 178, and a rear end of the arm 181 is attached to the inclined surface 1.
An inclined surface 182 shorter than 80 is formed. In addition, a knock member 183 rotatably disposed at an intermediate portion of the shaft main body 166 has the inclined surfaces 180 and 18 respectively.
2, a first contact portion 184 and a second contact portion 185 are formed. In addition, each contact portion 1 of knock member 183
84 and 185 are formed and arranged so as to straddle the tapered slide 168 so that they can contact the respective inclined surfaces 180 and 182. Reference numeral 186 denotes a resilient member such as a coil spring stretched between the tip member 176 and the slide member 178.
8 is always biased backwards. Reference numeral 187
Is a grip member made of a rubber material or the like which is coated over the front part of the shaft main body 166 and the rear part of the tip member 176. The grip member 187 and the shaft body 16
A window hole 188 in which the knock member 183 rotates with its front end as a fulcrum is formed in the middle portion where 6 is matched.

Next, the operation will be described. The state shown in FIG. 82 is a state in which the residual core A separated from the chuck body 169 is held by the core detent member 179, and the subsequent core B is gripped by the chuck body 169. The slide member 178 is urged rearward by the resilient member 186, but its rear end (inclined surface 182) is in contact with the second contact portion 185 of the knock member 183. The backward movement of the slide member 178 is restricted. It should be noted that the first contact portion 184 of the knock member 183 and the inclined surface 180 of the tapered slide are not in contact with each other and are separated from each other in a normal state. Note that, by forming the separated state, even if the core diameter is slightly reduced due to variations occurring during production, the gripping force of the chuck body is not impaired, and good writing can be performed. Also occur. By the way, if the tapered slide is always in contact with and pressed against the knock member, the gripping force of the core is reduced, and there is a danger that the core will sink during writing. When the knock member 183 is pressed in the axial direction (radial direction) of the shaft main body 1 from the above state, the second contact portion 185 of the knock member 183 is inclined by the inclined surface 182 of the slide member 178.
, Whereby the slide member 178 moves forward. At this time, since the residual core A is held by the detent member 179 of the slide member 178, the residual core A also advances with the slide member 178. Further, the knock member 1
When the lever 83 is pressed, the first contact portion 184 of the knock member 183 contacts the inclined surface 180 of the tapered slide 168, and the tapered slide 168 starts to move forward.
However, at this point, since the second contact portion 185 of the knock member 183 has passed over the top of the inclined surface 182 of the slide member 178, the slide member 168 is no longer provided.
Is in a state in which it cannot advance, and is in a state of holding the position even if the knock member 183 is further pressed (see FIG. 83).

When the tapered slide 168 starts to move forward, the chuck body 169 and the chuck ring 170 that grip the trailing core B move forward with the operation.
During the forward movement of the chuck body 169, the chuck body 1
The subsequent core B gripped by 69 abuts against the residual core A and presses it, whereby the residual core A is displaced by the slide member 178.
(See FIG. 84). Eventually, the chuck ring 170 contacts the rear end of the slide member 178, the chuck body 169 expands, and the subsequent lead B is released. In this process, the slide member 178 is urged rearward by the elastic member 186. However, since the top of the inclined surface 182 is in contact with the second contact portion 185 of the knock member 183, Restrictions on moving to the US are regulated. The amount of forward movement of the tapered slide 168 by the first contact portion 184 of the knock member 183 is greater than the amount of forward movement of the slide member 178 by the second contact portion 185. That is, the tapered slide advances more than the slide member. The specific means is taper slide 1
The length of the inclined surface 180 at 68 is longer than the length of the inclined surface 182 of the slide member 178, and therefore, the forward movement distance is increased. Here, when the pressing operation of the knock member 183 is released, the tapered slide 168 first retreats, whereby the chuck body 169 and the chuck ring 170 also retreat, grip the succeeding core B again, and the retreat operation is completed. . However, since the second contact portion 185 of the knock member 183 is pressing the inclined surface 182, the slide member 178 keeps its advanced position. Further, at this time, as described in the related art, the trailing core B is slightly retracted because it is gripped immediately before the chuck body 169 is completely closed / retracted. Is formed (see FIG. 85). Here, when the pressing operation of the knock member 183 is further released, the second contact portion 1 of the knock member 183 is released.
85 moves over the top of the inclined surface 182 again, and the resilient force of the resilient member 186 causes the slide member 178 to retreat together with the residual core A. At this time, the trailing end of the residual core A and the trailing lead B
(See FIG. 86). In this example, after the advance of the slide member is regulated, the movement of the tapered slide is started, and the chuck body is expanded.However, the movement of the tapered slide is started in the course of the advancement of the slide member, The chuck ring may catch up and abut on the rear end of the slide member, and the chuck body may be expanded. In other words, when the chuck body holds the lead, if the slide member is set to retreat after the chuck body closes for a distance equal to or longer than the return amount of the lead, there is no mechanism for regulating the advance of the slide member. Is also good.

A twenty-first example will be described with reference to FIGS. 87 and 88. This is an example in which a slide member is retracted by pressing a grip member disposed on a shaft cylinder. The details will be described below. A grip member 190 made of a rubber-like elastic body is mounted on a front outer peripheral surface of the shaft cylinder 189. A tip member 191 is fixed to the front end of the shaft cylinder 189 by means such as screwing, and a slide member 193 having a center detent member 192 is slidably disposed on the tip member 191. Have been. An arm portion 194 is formed behind the slide member 193 so as to be slidably fitted into the slit 198a of the shaft cylinder 189, and has an engagement hole 195 at a rear portion of the arm portion 194. An inclined surface 195a is formed on the rear end side of the engagement hole 195. on the other hand,
A through-hole 196 is formed in the shaft cylinder 189 corresponding to the engagement hole 195, and an inner projection 197 of the grip member 190 is loosely inserted into the through-hole 196. Reference numeral 198 denotes a lead tank, and the lead tank 198 is provided.
A chuck body 199 is fixed to the front end of the chuck body 199. Next, a usage example will be described. FIG. 87 shows the core tank 19.
8 is in a state in which the lead-out operation of the lead is performed. As in the prior art, there is a gap 2 between the residual core A and the subsequent core B.
00 is formed. Here, when the grip member 190 is gripped for writing, the grip member 190 is deformed inward by the gripping force, and the inner surface projection 197 retreats the arm portion 194 along the inclined surface 195a of the arm portion 194. At this time, the slide member 193 is also retracted, and as a result, the rear end of the residual core A comes into contact with the front end of the subsequent core B (FIG. 8).
9).

A twenty-second example will be described with reference to FIG. It is a modification of the fifteenth example. This is an example in which a distance P until the chuck ring contacts the step portion is set to be longer than a distance Q until the protrusion of the chuck body contacts the front end of the window of the slide member. This will be specifically described below. In addition, the first
Similarly to the five examples, the rear of the slide member 201 has a window hole 2
The protrusion 205 of the chuck body 204 is loosely inserted into the window hole 202. On the other hand, the shaft cylinder 58
A step 97 is formed on the inner surface of the tip member 65 fixed to the front end of the contact member with which the chuck ring 61 contacts. The moving distance P of the chuck ring 61 is set to be longer than the distance Q until the protrusion 205 of the chuck body 204 comes into contact with the front end of the window hole 202 of the slide member 201. Further, the sliding resistance of the slide member 201 with respect to the tip member 65 is set to be larger than the sliding resistance of the core with respect to the center detent member 96. Next, the operation will be described. When the lead tank 59 is pressed, the trailing lead B is pressed together with the chuck body 204, and accordingly, the remaining lead A is also pressed and moved forward. Eventually, the protrusion 205 of the chuck body 204 comes into contact with the front end of the window of the slide member 201 (see FIG. 91), and also advances the slide member 201 (see FIG. 92). Further, when the core tank 59 is pressed,
While the chuck ring 61 contacts the stepped portion 97 and the chuck body 204 presses and advances the slide member 201, the chuck body 204 is expanded, and at this time, the trailing lead B is released (see FIG. 93). ). Here, when the pressing operation of the core tank 59 is released, the chuck body 204 retreats, retreats with the slide member 201 with a slight delay, and is eventually closed by the chuck ring 61.

A modification of the twenty-second embodiment will be described with reference to FIGS. 94 to 99. At the rear of the slide member 201, a window hole 20 is provided.
2 is formed, and an inclined surface 203 is formed at the front end side of the window hole 202. In the window 202,
The protrusion 205 of the chuck body 204 is loosely inserted in the same manner as in the above-described example, but the front end face of the chuck body 204 has an inclined surface
Are formed. On the other hand, a step portion 97 with which the chuck ring 61 contacts is formed on the inner surface of the tip member 65 fixed to the front end of the shaft cylinder 58. The moving distance P of the chuck ring 61 is equal to the protrusion 2 of the chuck body 204.
The distance Q is set to be longer than the distance Q until the slider 05 comes into contact with the front end of the window hole 202 of the slide member 201. Next, the operation will be described. When the wick tank 59 is pressed, the subsequent wick B is pressed together with the chuck body 204, and accordingly,
The residual core A also presses and moves forward. Eventually, the inclined surface 206 of the chuck body 204 comes into contact with the inclined surface 203 of the slide member 201 (see FIG. 95), and also advances the slide member 201 (see FIG. 96). Further, when the lead tank 59 is pressed, the chuck ring 61 comes into contact with the step portion 97, and the chuck body 204 is expanded by the inclined surfaces of each other. At this time, the trailing lead B is released (FIG. 97). Here, when the pressing operation of the core tank 59 is released, the chuck body 204 retreats (see FIG. 98), retreats with the slide member 201 with a slight delay, and is eventually closed by the chuck ring 61 (FIG. 99). reference). In other words, in this embodiment, the chuck body is actively expanded by forming inclined surfaces on each member,
Thus, the operation of expanding the chuck body is ensured.

[0054]

According to the present invention, there is provided a mechanical pencil having a slide member having a lead insertion hole formed in front of a barrel, and a lead-out means disposed inside the barrel so as to be movable back and forth. The first aspect is that the slide member and the retreating operation of at least one member of the core feeding means are interlocked, and the slide member having a core insertion hole is provided in front of the barrel, A mechanical pencil in which the core feeding means is arranged to be able to move back and forth inside the barrel,
The second aspect is that a knocking member is formed with a contact portion that comes into contact with each of the slide member and the core feeding means, and a slide member having a core insertion hole formed in front of the barrel,
A third aspect of the present invention is a mechanical pencil in which a lead-out means is disposed inside the barrel so as to be able to move back and forth, and the slide member is retracted by pressing the barrel. Even at the time of writing, writing can be performed without a sense of incongruity, so that residual core can be used effectively.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a first example of the present invention.

FIG. 2 is an enlarged perspective view of a main part of FIG.

FIG. 3 is a longitudinal sectional view of a main part showing a second example of the present invention.

FIG. 4 is an operation explanatory view of a second example.

FIG. 5 is an operation explanatory diagram of a second example.

FIG. 6 is a vertical sectional view of a main part showing a third example of the present invention.

FIG. 7 is a longitudinal sectional view of a main part showing a fourth example of the present invention.

FIG. 8 is an enlarged perspective view of the configuration shown in FIG. 7;

FIG. 9 is a longitudinal sectional view showing a fifth example of the present invention.

FIG. 10 is a sectional perspective view of a main part showing a sixth example of the present invention.

FIG. 11 is a perspective view showing the slide member of FIG. 10;

FIG. 12 is a sectional perspective view showing a seventh example of the present invention.

FIG. 13 is a vertical sectional view showing a main part of an eighth embodiment of the present invention.

FIG. 14 is an enlarged perspective view of FIG.

FIG. 15 is a vertical sectional view showing a ninth embodiment of the present invention.

FIG. 16 is a longitudinal sectional view of a slide member according to a tenth embodiment of the present invention.

FIG. 17 is an external view of a slide member showing an eleventh example of the present invention.

FIG. 18 is a longitudinal sectional view showing a twelfth example of the present invention.

FIG. 19 is an enlarged perspective view of a main part of FIG. 18;

FIG. 20 is an operation explanatory diagram.

FIG. 21 is an operation explanatory diagram.

FIG. 22 is an operation explanatory diagram.

FIG. 23 is an operation explanatory diagram.

FIG. 24 is an operation explanatory view.

FIG. 25 is an operation explanatory view.

FIG. 26 is a diagram showing a thirteenth example of the present invention.

FIG. 27 is an enlarged perspective view of a main part of FIG. 26;

FIG. 28 is an explanatory view showing a core gripping state.

FIG. 29 is an operation explanatory view.

FIG. 30 is a diagram showing a configuration example of a slide member.

FIG. 31 is a diagram showing a configuration example of a slide member.

FIG. 32 is a diagram showing a configuration example of a slide member.

FIG. 33 is a longitudinal sectional view showing a fourteenth example of the present invention.

FIG. 34 is an enlarged view of a main part of the configuration shown in FIG. 33;

FIG. 35 is an enlarged view of a main part of the configuration shown in FIG. 33;

36 is an enlarged view of a main part of the configuration shown in FIG. 33.

FIG. 37 is a longitudinal sectional view showing the operation of the lead gripping mechanism.

FIG. 38 is a longitudinal sectional view showing the operation of the lead gripping mechanism.

FIG. 39 is an explanatory view showing the operation of the lead gripping mechanism.

FIG. 40 is an explanatory view showing the operation of the lead gripping mechanism.

FIG. 41 is an explanatory view showing the operation of the lead gripping mechanism.

FIG. 42 is an explanatory view showing the operation of the lead gripping mechanism.

FIG. 43 is an explanatory view showing a configuration of a slide member.

FIG. 44 is a view showing a modification of the slide member of FIG. 43.

FIG. 45 is an explanatory view showing the operation of the slide member.

FIG. 46 is a view showing still another modified example of the slide member.

FIG. 47 is a view showing still another modified example of the slide member.

FIG. 48 is a view showing a configuration example of a chuck body.

FIG. 49 is a view showing a configuration example of a chuck body.

FIG. 50 is a view showing a configuration example of a chuck body.

FIG. 51 is a diagram showing a configuration example of a chuck body.

FIG. 52 is a view showing a method of assembling the chuck body.

FIG. 53 is a longitudinal sectional view showing a fifteenth example of the present invention.

FIG. 54 is an enlarged sectional view of a main part of FIG. 15;

FIG. 55 is an operation explanatory diagram.

FIG. 56 is an operation explanatory diagram.

FIG. 57 is an explanatory diagram of the operation.

FIG. 58 is an operation explanatory diagram.

FIG. 59 is a longitudinal sectional view of a main part showing a sixteenth example of the present invention.

FIG. 60 is an explanatory view showing an example of a mold apparatus for forming a chuck body employed in the present invention.

FIG. 61 is an explanatory view showing an example of a mold apparatus for forming a chuck body employed in the present invention.

FIG. 62 is an explanatory view showing an example of a mold apparatus for forming a chuck body employed in the present invention.

FIG. 63 is an explanatory view showing an example of a mold apparatus for forming a chuck body employed in the present invention.

FIG. 64 is a longitudinal sectional view showing a seventeenth example of the present invention.

FIG. 65 is an enlarged view of a main part of FIG. 64 and is an operation explanatory view.

FIG. 66 is an enlarged view of a main part of FIG. 64 and is an operation explanatory view.

67 is an enlarged view of a main part of FIG. 64 and is an operation explanatory view.

FIG. 68 is an enlarged view of a part showing an eighteenth example of the present invention.

FIG. 69 is a view showing a modification of the chuck body of the seventeenth example.

FIG. 70 is a perspective view with a part removed showing still another modification of the chuck body of the seventeenth example.

FIG. 71 is a perspective view with a part deleted showing still another modified example of the chuck body of the seventeenth example.

FIG. 72 is a perspective view with a part removed showing still another modification of the chuck body of the seventeenth example.

FIG. 73 is a perspective view with a part removed showing still another modified example of the chuck body of the seventeenth example.

FIG. 74 is a longitudinal sectional view showing a nineteenth example of the present invention.

75 is a sectional view of a principal part in FIG. 74;

FIG. 76 is an explanatory view showing the operation of the nineteenth example.

FIG. 77 is an explanatory view showing the operation of the nineteenth example.

FIG. 78 is an explanatory view showing the operation of the nineteenth example.

FIG. 79 is an explanatory view showing the operation of the nineteenth example.

FIG. 80 is an essential part enlarged view showing a modification of the nineteenth example of the present invention.

FIG. 81 is an essential part enlarged view showing still another modified example of the nineteenth example of the present invention.

FIG. 82 is a longitudinal sectional view showing a twentieth example of the present invention.

FIG. 83 is a view for explaining the operation of the twentieth example;

FIG. 84 is a view for explaining the operation of the twentieth example;

FIG. 85 is a view for explaining the operation of the twentieth example;

FIG. 86 is a view for explaining the operation of the twentieth example;

FIG. 87 is an enlarged longitudinal sectional view of a main part of a twenty-first example of the present invention.

FIG. 88 is a cross-sectional view of a twenty-first example of the present invention.

FIG. 89 is an explanatory view of the operation of the twenty-first example of the present invention.

FIG. 90 is a diagram showing a configuration and operation according to a twenty-second example of the present invention.

FIG. 91 is a diagram showing a configuration and operation according to a twenty-second example of the present invention.

FIG. 92 is a diagram showing a configuration and operation according to a twenty-second example of the present invention.

FIG. 93 is a diagram showing a configuration and operation according to a twenty-second example of the present invention.

FIG. 94 is a diagram showing a modification of the twenty-second example of the present invention.

FIG. 95 is a diagram showing a modification of the twenty-second example of the present invention.

FIG. 96 is a diagram showing a modification of the twenty-second example of the present invention.

FIG. 97 is a diagram showing a modification of the twenty-second example of the present invention.

FIG. 98 is a diagram showing a modification of the twenty-second example of the present invention.

FIG. 99 is a diagram showing a modification of the twenty-second example of the present invention.

[Explanation of symbols]

 Reference Signs List 1 shaft main body 2 core tank 3 relay member 4 core guide member 5 chuck body 6 chuck ring 7 press-fit member 8 connecting member 9 tip member 10 slide member 12 core protection tube 13 outer surface flange portion 14 cylindrical portion 15 inner surface flange portion 16 intermediate stage Part 17 Inner surface step 18 Chuck body 19 Slide member 20 Outer flange 21 Chuck body 22 Tubular part 23 Inner flange 24 Core detent member 25 Core protection tube 26 Detent holding part 28 Slide member 29 Core detent piece 30 Projection 31 Engagement piece 32 Inner flange portion 33 Core protection tube portion 34 Conical portion 35 Slide member 36 Core protection tube portion 37 Slit 38 Projection 39 Slide member 40 O-ring 41 Cylindrical member 42 Inner surface flange portion 43 Restriction ring 44 Male screw portion 45 Female screw Part 46 slide member 47 cylindrical part 48 slit 49 inner surface flange part 50 rod part 51 concave Part 52 O-ring 53 Resilient member 54 Slide member 55 Cylindrical part 56 Elastic deformation part 57 Chuck body 58 Shaft main body 58a Depression 59 Core tank 60 Chuck body 60a Rear part 60b Inclined surface 60c Front part 61 Chuck ring 62 Clip 62a Base 63 Eraser 64 Knock cap 65 Front member 65a Inner rib 65b Rear end 66 Grip 67 Slide member 68 Core detent member 68a Core insertion hole 68b Core detent part 68c Groove part 68d Conical part 69 Core protection pipe part 70 Projection part 71 Cylindrical part 72 Engaging hole 73 Slope 74 Repelling member 75 Edge 76 Intermediate step 77 Inner step 78 Slide member 79 Elastic deformation part 80 Slide member 81 Tubular part 82 Engagement hole 83 Slit 84 Slope 85 Inner slope 86 Slide Member 87 Cylindrical part 88 Engagement hole 89 Guide groove 90 Swelling part 91 Pressing member 93 Inner surface step 94 Core feeding means 95 Guide member 96 Core detent member 97 Step 98 O-ring 99 Cylindrical member 100 Window hole 101 Mold 102 Cavity 103 Core pin 104 Shaft body 105 Core tank 106 First chuck body 107 Chuck ring 108 Tip member 109 Second chuck body 110 Core holding part 111 Core holding part 112 Chuck ring part 113 Outer flange 114 Cylindrical part 115 Inner flange 116 Middle step 117 Inner step 118 first chuck body 119 second chuck body 120 inner flange 121 cone angle 122 cone angle 123 second chuck body 124 inner flange 125 cone 126 first chuck body 127 outer flange 128 cone angle 129 cone angle 131 second Chuck body 132 Tube part 1 3 Stitch part 134 Rubber-like elastic body 135 Bellows part 136 Slit 137 Shaft main body 138 Core tank 139 Chuck body 140 Chuck ring 141 Resilient member 142 Inner surface step part 143 Core feeding means 148 Tip member 149 Slide member 150 Core detent member 151 Groove part 151a Locking portion 152 Arm 153 Inner protrusion 154 Inner reduced diameter portion 155 Slit 156 Repelling member 157 Intermediate step 158 Inclined wall 159 Arm 160 Inner protrusion 161 Slide member 162 Arm 163 Core tank 164 Slit 165 Projection 166 Shaft main body 167 Core tank part 168 Taper slide 169 Chuck body 170 Chuck ring 171 Core receiving member 172 Core insertion hole 173 Repelling member 174 Inner surface step 175 Core feeding means 176 Tip member 17 Slide member 179 Center detent member 180 Inclined surface 181 Arm portion 182 Inclined surface 183 Knock member 184 First contact portion 185 Second contact portion 186 Resilient member 187 Grip member 188 Window hole 189 Shaft cylinder 190 Grip member 191 Tip member 192 Core detent member 193 Slide member 194 Arm 195 Engagement hole 195a Inclined surface 196 Through hole 197 Inner surface projection 198 Core tank 198a Slit 199 Chuck body 200 Gap 201 Slide member 202 Window hole 203 Inclined surface 204 Chuck body 205 Projection 206 Inclined surface A Remaining core B Subsequent core

Continued on the front page (31) Priority claim number Japanese Patent Application 2000-199092 (P2000-1990932) (32) Priority date June 26, 2000 (2000.26.26) (33) Priority claim country Japan (JP) (31) Priority claim number Japanese Patent Application 2000-227844 (P2000-227844) (32) Priority date July 27, 2000 (July 27, 2000) (33) Priority claim country Japan (JP) (31) ) Priority claim number Japanese Patent Application No. 2000-331956 (P2000-331956) (32) Priority date October 31, 2000 (Oct. 31, 2000) (33) Priority claiming country Japan (JP) (31) Priority Claim No. Patent Application No. 2000-354336 (P2000-354336) (32) Priority Date November 21, 2000 (November 21, 2000) (33) Priority Claiming Country Japan (JP) (31) Priority Claim No. Application No. 2000-363822 (P2000-363822) (32) Priority date November 29, 2000 (November 29, 2000) (33) Priority claiming country Japan (JP) (31) Priority claim number Japanese Patent Application 2001- 22541 (P2001-22541) (32) Priority Date January 31, 2001 (2001.1.31) (33) Priority Country Japan (JP) (72) Inventor Souji Onuki Saitama 125 Kawafuji, Yoshikawa-shi, Japan Pentel Co., Ltd. Yoshikawa Plant F-term (reference) 2C353 FA04 FA06 FC13 FE02 FE04 FE06 FG06

Claims (17)

[Claims] 1. A mechanical pencil having a slide member having a lead insertion hole formed in front of a barrel, and a lead-out means arranged inside the barrel so as to be movable back and forth. A mechanical pencil in which a retreating operation of a slide member and at least one member of a core feeding means is linked. 2. The mechanical pencil according to claim 1, wherein at least one member of the lead-out means is a lead chuck body. 3. The mechanical pencil according to claim 1, wherein at least one member of the lead-out means is a lead tank. 4. The mechanical pencil according to claim 1, wherein at least one member of said lead-out means is a repellent member. 5. The mechanical pencil according to claim 2, wherein the chuck body and the slide member are linked with each other.
A mechanical pencil formed by engagement of steps formed on members of each other. 6. The mechanical pencil according to claim 1, wherein the slide member is urged forward by a resilient member. 7. The mechanical pencil according to claim 6, wherein the biasing force of the repelling member is greater than the sliding resistance between the chuck body and the slide member. 8. The mechanical pencil according to claim 1, wherein a projection is formed on an outer surface of the chuck body, and the projection is engaged with a rear portion of the slide member. A mechanical pencil having an engagement hole. 9. The mechanical pencil according to claim 2, wherein the chuck body is opened and closed by a chuck ring, and a slope is formed at a portion of the chuck body where the chuck ring contacts, and the slope is formed. A mechanical pencil, wherein a cavity to be formed is at least a separate member from a cavity to form another part. 10. The mechanical pencil according to claim 8, wherein a front side of the chuck body surrounds a chuck ring for opening and closing the chuck body, and a moving distance of the chuck ring is set to a distance of the chuck body. 2. The mechanical pencil according to claim 1, wherein the protrusion is shorter than a distance in which the window moves in the slide member. 11. The mechanical pencil according to claim 10, wherein a gap is formed between the slide member and the barrel, and the gap is smaller than a fitting distance between the chuck body and the slide member. A mechanical pencil characterized by: 12. A mechanical pencil having a second chuck body for gripping and releasing a lead disposed at a tip of a barrel, and a first chuck body disposed behind the second chuck body. And a center detent portion for holding the core lightly in the second chuck body, and the first chuck body and the second chuck body are moved backward with each other, and the operation is performed. A mechanical pencil characterized by being moved by a retreating operation of a first chuck body. 13. The mechanical pencil according to claim 12, wherein the first chuck body and the second chuck body are interlocked with each other by engagement of steps formed on the members. A mechanical pencil characterized by: 14. A mechanical pencil having a slide member having a core insertion hole formed in front of a barrel, and a core feeding means disposed inside the barrel so as to be movable back and forth. A mechanical pencil characterized in that a contact portion for contacting each of the slide member and the lead-out means is formed in the knock member. 15. The mechanical pencil according to claim 14, wherein each of the abutting portions of the knock member abuts on the slide member at the beginning of the centering operation, and then abuts on the center advancing means. A mechanical pencil characterized by: 16. The mechanical pencil according to claim 14, wherein the knock member is disposed on a side surface of a shaft cylinder. 17. A mechanical pencil having a slide member in which a core insertion hole is formed in front of a barrel, and a core feeding means disposed inside the barrel so as to be movable back and forth,
A mechanical pencil for retracting the slide member by pressing the barrel.