JP2013039743A - mechanical pencil - Google Patents

Abstract

[PROBLEMS] To provide a mechanical pencil capable of smoothly projecting and retracting a writing part and a knock part from front and rear end parts of a shaft tube and realizing a smooth feeding operation of a writing core.
An operation unit 3 capable of rotating around an axis relative to a shaft tube, a guide tube 12 receiving a rotational motion based on the rotation operation of the operation unit, and an axial direction of the guide tube First and second sliding pieces 16 and 18 arranged so as to be movable, and first and second moving the first and second sliding pieces in the axial direction in accordance with the rotational movement of the guide cylinder. Cam members 16 and 17 are provided. A mechanical pencil unit is connected to the first sliding piece 16, and a knock portion 21 is connected to the second sliding piece 18.
[Selection] Figure 8

Description

  The present invention relates to a mechanical pencil configured such that a writing portion and a knock portion are projected from the front and rear of the shaft tube by rotating the operation portion, and a writing core is extended from the writing portion by the knocking operation of the knock portion. About.

Knock-type mechanical pencils are mainly configured with a writing part and a knocking part protruding from the front and back of the barrel, respectively. According to the mechanical pencil with such a structure, this is stored in a pencil case. In such a case, the knock part may be carelessly pressed to cause a malfunction, or a writing part having a sharp tip may hit the pen case and cause damage.
Therefore, Patent Documents 1 to 3 disclose mechanical pencils that can accommodate the writing portion and the knocking portion in the shaft cylinder when not in use.

Japanese Utility Model Publication 4-32306 Japanese Utility Model Publication No. 4-90591 JP 2006-248068 A

By the way, according to the mechanical pencil disclosed in Patent Document 1, a guide groove is formed in a cam cylinder arranged in a shaft cylinder by a longitudinal groove part and oblique groove parts continuously formed at both ends thereof, and the writing part side. The first cam protrusion and the second cam protrusion on the knock portion side are configured to enter the guide groove.
According to this configuration, since the first and second cam protrusions slide in the thin guide groove, it is difficult to ensure a smooth sliding operation and there is a problem that the operation stability is lacking.

Further, according to the mechanical pencil disclosed in Patent Document 2, the rear cam rotates and moves along the slope of the front cam by rotating the sheath that forms the rear end portion of the shaft cylinder. By projecting from the inside of the cylinder and further rotating the sheath, the rear cam is retracted along the slope of the front cam, so that the knock part projects from the inside of the shaft cylinder.
According to this configuration, since the timing and rotational force for projecting the writing part and the knocking part from the shaft tube are different from each other, there is a sense of incongruity in the feeding operation, and the writing core is fed out by contacting the inner sheath with the inner cam For this reason, there is a structural defect that the inner sheath or the inner cam is easily damaged by impact by repeated knocking operations.

Furthermore, according to the mechanical pencil disclosed in Patent Document 3, the cylindrical rotor is rotated by the rotation operation of the rear shaft, and at this time, the cylindrical push rod disposed inside the rotor advances, The mechanical pencil unit moves forward in the shaft cylinder and is ready for writing.
According to this structure, the mechanical pencil unit is moved forward by the push rod in the barrel and is fed out. However, the number of parts of the mechanism part of the feeding portion is large, which increases the size of the mechanical pencil unit. Problems such as difficulty in attaching the (refill) are left.

  The present invention solves the problems in the mechanical pencils disclosed in each of the above-mentioned patent documents, and projects the writing portion and the knock portion at the front end portion and the rear end portion of the shaft tube, and also stores the writing portion and the knock portion. It is an object of the present invention to provide a mechanical pencil that can be smoothly operated and that can simplify the drawing-out operation of the writing core by a knocking operation and realize a smooth drawing-out operation of the writing core.

  The mechanical pencil according to the present invention, which has been made to solve the above-described problems, has an operation unit that can be rotated around an axis relative to a shaft tube, and a rotational motion based on the rotation operation of the operation unit. A guide cylinder housed in the shaft cylinder to be received; first and second sliding pieces disposed on the guide cylinder so as to be movable in the axial direction; and the first and second sliding pieces as the guide cylinder rotates. First and second cam members for moving the second sliding piece in the axial direction are provided, and the first and second sliding pieces are arranged on the basis of rotational movement in one direction of the guide cylinder. The first and second sliding pieces are based on the first state that is separated from each other along the cam surfaces of the first and second cam members, and the rotational movement of the guide tube in the other direction. A second shape made close to each other along the cam surfaces of the first and second cam members. In the first state, the writing part of the mechanical pencil unit connected to the first sliding piece and the knocking part connected to the second sliding piece are It is made into the state which protruded from the front-end part and the rear-end part of a shaft cylinder, respectively, By knocking operation of the said knock part in this state, the said 1st and 2nd cam member, the said 1st and 2nd sliding piece Is configured to move forward together with the mechanical pencil unit.

  In this case, in a preferred embodiment, the first and second cam members are disposed in the shaft cylinder, and either one of the outer peripheral surface of the cam member and the inner peripheral surface of the shaft cylinder is along the axial direction. A protruding rib is formed, and a groove portion is formed on the other side along the axial direction. The rib is accommodated in the groove portion, so that the first and second cam members are disposed in the shaft cylinder. It is arranged to be slidable in the axial direction.

  Preferably, a front end member that covers a front half portion of the mechanical pencil unit and that opens a front end through which a writing portion of the mechanical pencil unit can protrude is disposed in the shaft cylinder, and the knock member is disposed in the front end member. A contact portion that rejects the forward movement of the mechanical pencil unit based on the knocking operation of the portion is formed, and a part of the mechanical pencil unit is in contact with the contact portion so that the writing core is extended. The

  In addition, in a preferred embodiment, the first and second cam members are formed in a cylindrical shape so as to be slidable in the axial direction with the guide tube as an axis, and the cam surface is the first and second cam members. A cam bottom surface that is formed on both end surfaces in the axial direction of the second cam member and facing outward, and is flat in the circumferential direction, and is inclined along the circumferential direction following the cam bottom surface. A slope and a cam top surface that is flat in the circumferential direction following the cam slope are provided, and the first and second sliding pieces are brought into contact with the cam top surface to be in the first state, The first and second sliding pieces are brought into contact with the bottom surface of the cam, whereby the second state is achieved. Note that the first and second cam members may be integrally formed by injection molding or the like.

  In this case, the first and second cam members may be formed with concave portions into which the pointed portions of the first and second sliding pieces fall on the circumferentially flat cam top surfaces. desirable.

  Furthermore, first and second spring members for urging the first and second sliding pieces toward the cam surfaces of the first and second cam members are accommodated in the guide cylinder. It is desirable.

  According to the mechanical pencil having the above-described configuration, the first sliding piece to which the mechanical pencil unit (refill) is connected and the second sliding piece to which the knock portion is connected include the first and second cam members. By being separated from each other along the cam surface, the writing part and the knock part protrude from the front and rear of the shaft tube, respectively. By knocking the knocking portion in this state, the first and second cam members and the first and second sliding pieces move forward together with the mechanical pencil unit.

Therefore, by the symmetrical combination of the first and second cam members and the first and second sliding pieces, the writing operation and the knocking portion can be projected and returned, and the operation can be performed smoothly. can do.
Also, the main components of the first and second cam members and the first and second sliding pieces move back and forth together with the mechanical pencil unit in response to the knocking operation of the knocking part. The lead is paid out. Therefore, the writing-out operation of the writing core can be simplified, and a smooth drawing-out operation of the writing core can be realized.

It is the center sectional view which showed the whole structure in the 2nd state in which the writing part and the knock part were accommodated in the axial cylinder about the mechanical pencil which concerns on this invention. It is the central sectional view which showed the whole structure in the 1st state where the writing part and the knock part protruded before and after the axial cylinder similarly. It is the center sectional view showing the simple substance composition of a tip axis. It is the front view and center sectional view which showed the structure of the front tube accommodated in a front shaft. It is the center sectional view showing composition of a mouthpiece member stored in a tip tube. It is the center sectional view showing the simple substance composition of a rear axis. It is the perspective view and front view which showed the 2nd state of the sliding top drive unit. It is the perspective view and front view which showed the 1st state of the sliding piece drive unit. It is the perspective view and center sectional drawing of a guide cylinder. It is the perspective view and sectional drawing of a 1st sliding piece. It is the perspective view and sectional drawing of a 2nd sliding piece. It is the perspective view and front view of a 1st cam member. It is the perspective view and front view of a 2nd cam member. It is the external view and center sectional drawing of a mechanical pencil unit. It is the external view and center sectional drawing of a ball-point pen refill.

A mechanical pencil according to the present invention will be described based on an embodiment shown in the drawings.
As shown in FIGS. 1 and 2, the external appearance of the mechanical pencil in this embodiment is configured in a simple columnar shape, and the shaft cylinder constituting the outer shell is configured by the front shaft 1 and the rear shaft 2, and the rear shaft A cylindrical operation portion 3 that can be relatively rotated about an axis is attached to the rear end portion of 2.
FIG. 1 shows a second state in which the writing part and the knock part are accommodated in the shaft cylinder, and FIG. 2 shows a first state in which the writing part and the knock part protrude from the front and rear of the shaft cylinder. FIG. 2 shows the state shown in FIG. 1 rotated 90 degrees around the axis.

In the following, the overall configuration shown in FIGS. 1 and 2 will be mainly described, and the detailed configuration of each component will be individually described with reference to other drawings.
As shown in FIGS. 1 and 2, a tip tube 5 formed in a cylindrical shape is fitted and attached to the inner peripheral surface of the tip shaft 1. FIG. 3 is a central sectional view showing a single body configuration of the front shaft 1, and FIG. 4 shows an external configuration and a central sectional view of the front tube 5 housed in the front shaft 1.
4A is a front view of the front tube 5, and FIG. 4B is a longitudinal sectional view of the front tube 5 in the state shown in FIG. Further, (C) is a top view of the front tube 5 shown in a state rotated 90 degrees around the axis with respect to the state shown in (A), and (D) is the front tube in the state shown in (C). 5 is a longitudinal sectional view of FIG.

As shown in FIG. 3, a round hole-like opening 1 a for projecting a writing part of a mechanical pencil unit (refill), which will be described later, is formed at the front end of the front shaft 1. Linear ribs 1b are formed on the peripheral surface so as to reach from the front end portion in the axial direction to the substantially central portion. In this embodiment, the rib 1b is also formed at a position opposed to the inner peripheral surface of the front shaft 1 by 180 degrees, and a total of two ribs 1b are formed.
In addition, an annular rib 1c protruding along the inner peripheral surface is formed in the vicinity of the rear end portion of the inner peripheral surface of the front shaft 1.

On the other hand, as shown in FIG. 4A, a linear groove 5a is formed on the outer periphery of the front tube 5 so as to extend from the front end portion in the axial direction to substantially the center portion. The grooves 5a are also formed on the back-to-back outer peripheral surfaces of the front tube 5 in the same manner. An annular rib 5b protruding along the outer peripheral surface is formed slightly rearward of the central portion of the outer peripheral surface of the front tube 5.
Further, a male screw 5 c is provided on the outer peripheral surface of the rear end portion of the front tube 5. The male screw 5c functions to be separably connected to a female screw (described later) formed on the inner peripheral surface of the rear shaft 2 described above.

In the configuration described above, the front tube 5 is inserted from the rear end portion of the front shaft 1, the groove 5 a is aligned with the rib 1 b, and the front tube 5 is pushed into the front shaft 1. The front tube 5 can be fitted. At this time, the annular rib 5b formed on the outer peripheral surface of the front tube 5 enters the inner side of the annular rib 1c formed on the inner peripheral surface of the front shaft 1, whereby both are coupled in a fitted state. The
As shown in FIGS. 4B and 4D, on the inner peripheral surface on the front end side of the front tube 5, there are six ribs 5d along the axial direction at equal intervals in the circumferential direction. Has been placed. The rib 5d acts in such a manner that the tip member can smoothly slide in the axial direction by coming into linear contact with the outer peripheral surface of the tip member described later.

Further, as shown in FIGS. 4B and 4D, a protruding portion 5e is formed on the further axial side of the rib 5d, and this protruding portion 5e serves as a shaft for a mouthpiece member to be described later. It acts to lock one end of the spring member that is biased toward the rear side in the direction.
Further, as shown in FIG. 4D, a step portion 5f is formed at substantially the center portion of the inner peripheral surface of the front tube 5, and this restricts movement of the tip member, which will be described later, in the axial direction. It acts as a contact part.

  Returning to FIGS. 1 and 2, a tip member 6 is further accommodated in the front tube 5. The tip member 6 is arranged so as to be movable in the axial direction within a certain range in the tip tube 5, and the front half of the mechanical pencil unit 7 is accommodated in the tip member 6. The tip member 6 is urged toward the rear in the axial direction by the spring member 8 shown in FIGS.

  The tip member 6 is formed in a cylindrical shape as shown in a cross-sectional view in FIG. 5, and a tip port 6 a through which the writing portion 7 a of the mechanical pencil unit 7 can project is opened at the front end portion thereof. An annular contact portion 6b is formed immediately after the front opening 6a. When the mechanical pencil unit 7 receives a knock operation and moves forward, the tip of the unit 7 contacts the contact portion 6b. It acts so that the writing core is drawn out.

Further, an annular step portion 6c having a different outer diameter is formed at the center portion in the length direction of the tip member 6, and this step portion 6c receives the other end portion of the spring member 8. . That is, the spring member 8 is interposed between the protruding portion 5e formed on the inner surface of the front tube 5 and the stepped portion 6c of the front end member 6, thereby moving the front end member 6 rearward in the axial direction. Acts to energize.
As shown in FIGS. 1 and 2, a stopper 9 formed in a cylindrical shape is fitted in the front tube 5 and is accommodated in the front tube 5 and attached rearward by the spring member 8. The retracted position of the tip member 6 to be biased is regulated by the stopper 9.

  Further, a flange-shaped member 6d is formed on the rear end portion of the tip member 6 toward the outside. When the mechanical pencil unit 7 receives a knock operation and moves forward, the hook member 6d moves forward, but the tip member 6 also moves forward. However, the flanged member 6d is formed on the step 5f formed on the inner peripheral surface of the tip tube 5. It contacts and acts so as to limit the movement of the tip member 6 in the axial direction.

  FIG. 6 is a cross-sectional view of the rear shaft 2 described above, and a female screw 2a is provided on the inner peripheral surface of the rear shaft 2 on the front end side. The female screw 2a is screwed into the male screw 5c of the front tube 5 fitted to the front shaft 1, and the front shaft 1 and the rear shaft 2 are connected to each other in a separable manner. As shown in FIG. 6, linear ribs 2 b projecting along the axial direction are formed in a range from the central portion to the rear portion on the inner peripheral surface of the rear shaft 2. The rib 2b functions as a guide that allows first and second cam members, which will be described later, housed in the rear shaft 2 to move only in the axial direction.

  Further, an annular rib 2 c is formed on the inner peripheral surface on the rear end side of the rear shaft 2. The annular rib 2c is rotatably mounted with a cylindrical operation portion 3 that constitutes a sliding piece drive unit 11 described below so that the sliding piece drive unit 11 including the operation portion 3 does not fall off. The function to lock to.

FIGS. 7 and 8 show the sliding piece drive unit 11 in an assembled state. FIG. 7 shows the first and second sliding pieces along the cam surfaces of the first and second cam members. 2 shows the second state approaching each other, that is, the state shown in FIG. FIG. 8 shows a first state in which the first and second sliding pieces are separated from each other along the cam surfaces of the first and second cam members, that is, the state shown in FIG.
7 and FIG. 8A is a perspective view of the sliding piece driving unit 11, and FIG. 7B is a state in which the sliding piece is located on the front side. It is shown by the front view.

  As shown in FIGS. 7 and 8, the sliding piece drive unit 11 is provided with a guide cylinder 12. The single unit configuration of the guide tube 12 is shown in FIG. That is, FIG. 9A shows the guide cylinder 12 in a perspective view, and FIG. 9B shows a cross-sectional view of a split groove portion provided in the guide cylinder 12.

  The guide cylinder 12 has a bowl-shaped large-diameter portion 12a formed at the front end, and an opening 12b is formed in the large-diameter portion 12a. The rear end portion of the mechanical pencil unit 7 is formed in the opening 12b. It is configured so that it can be inserted. Further, a linear dividing groove 12c is provided in the axial direction on the rear end side of the guide tube 12 excluding the large diameter portion 12a.

Then, as shown in FIGS. 7 and 8, the first spring member 14 is inserted from the rear end side of the guide cylinder 12, and then the first sliding piece 15 is inserted along the split groove 12c. A cylindrical first cam member 16 is mounted along the outer peripheral surface of the guide tube 12, and then a cylindrical second cam member 17 is mounted along the outer peripheral surface of the guide tube 12. Further, the second sliding piece 18 is inserted along the split groove 12c, and then the second spring member 19 is inserted.
Finally, the small-diameter portion 3a on the front end side of the operation portion 3 formed in a cylindrical shape is fitted so as to cover the rear end portion of the guide tube 12, whereby the sliding piece driving unit 11 described above is fitted. It is assembled.

  FIG. 10 is a perspective view and a sectional view of the first sliding piece 15 constituting the sliding piece drive unit 11 described above. The first sliding piece 15 is formed on a cylindrical portion 15a that slides into the guide cylinder 12 and a peripheral surface of a front end portion of the cylindrical portion 15a, and extends along the dividing groove 12c of the guide cylinder 12. A guide protrusion 15b that moves, and a rear end side of the guide protrusion 15b is formed into a pointed portion 15c. The pointed portion 15c is configured to slide on a cam surface (described later) of the first cam member 16. ing.

  As shown in FIG. 10B, a plurality of ribs 15d are formed along the axial direction on the inner peripheral surface of the rear end side of the cylindrical portion 15a of the first sliding piece 15, and the plurality of ribs are formed. The rib 15d functions as a holding portion to which a rear end portion to be described later attached to the mechanical pencil unit 7 or a rear end portion such as a ballpoint pen refill is press-fitted and connected.

  FIG. 11 is a perspective view and a sectional view of the second sliding piece 18 constituting the sliding piece driving unit 11 described above. The second sliding piece 18 includes a cylindrical portion 18 a that slides in the guide cylinder 12 and a guide protrusion that is formed on a side surface of the cylindrical portion 18 a and moves along the dividing groove 12 c of the guide cylinder 12. 18b, and the front end side of the guide protrusion 18b is formed as a pointed portion 18c. The pointed portion 18c is configured to slide on a cam surface (described later) of the second cam member 17.

Further, a small diameter portion 18d is formed following the cylindrical portion 18a of the second sliding piece 18, and one end of the second spring member 19 is mounted so as to surround the small diameter portion 18d.
The second sliding piece 18 is formed with a projecting body 18e having a conical head following the small diameter section 18d. The projecting body 18e has a knock section shown in FIGS. 21 is detachably mounted.

12A and 12B show the configuration of the first cam member 16 constituting the sliding piece drive unit 11, and FIG. 12A is a perspective view with the circumferential surface on which the groove is formed facing forward, and FIG. The front view of the state which made the groove part the front side similarly, (C) is a front view shown in the state rotated 90 degrees around the axis with respect to the state shown in (B).
The first cam member 16 is formed in a cylindrical shape, and an inner peripheral surface 16a thereof is slidable in the axial direction around the guide tube 12 as described above, and is rotatable relative to the guide tube 12. It is attached so that it becomes.

  Further, the groove 16b is formed linearly on the cylindrical surface of the first cam member 16, and the sliding piece drive unit 11 is accommodated in the rear shaft 2 in the groove 16b. It arrange | positions so that the linear rib 2b which protruded along the axial direction in the axis | shaft 2 may be accommodated. Thereby, the first cam member 16 is slid along the axial direction in the rear shaft 2.

Further, a cam surface is formed on the back side of the cylindrical surface where the groove 16b of the first cam member 16 is formed as shown in FIGS.
The cam surface includes a cam bottom surface 16c that is flat in the circumferential direction, a cam slope surface 16d that is inclined along the circumferential direction following the cam bottom surface, and a cam top surface that is flat in the circumferential direction following the cam slope surface. 16e, and a concave portion 16f is formed on the cam top surface 16e.

13A and 13B show the configuration of the second cam member 17 constituting the sliding piece drive unit 11. FIG. 13A is a perspective view in which the cam surface forming portion is the front side, and FIG. 13B is the groove portion. FIG. 6C is a front view showing the state where the front side is in the front side, and FIG. 8C is a front view showing the state shown in FIG.
The second cam member 17 is formed in a cylindrical shape, and its inner peripheral surface 17a is slidable in the axial direction with the guide tube 12 as an axis, and is rotatable relative to the guide tube 12. It is attached so that it becomes.

  Further, a groove portion 17b is formed linearly on the cylindrical surface of the second cam member 17, and in this groove portion 17b, the sliding piece drive unit 11 is accommodated in the rear shaft 2, and the rear shaft 2 It arrange | positions so that the linear rib 2b which protruded along the axial direction may be accommodated inside. Accordingly, the second cam member 17 is slid along the axial direction in the rear shaft 2 together with the first cam member 16 described above.

  Further, a cam surface is formed on the back side of the cylindrical surface where the groove portion 17b of the second cam member 17 is formed. The cam surface includes a cam bottom surface 17c that is flat in the circumferential direction, a cam slope surface 17d that is inclined along the circumferential direction following the cam bottom surface, and a cam top surface 17e that is flat in the circumferential direction following the cam slope surface. And a concave portion 17f is formed in the cam top surface 17e.

Thus, the sliding piece drive unit 11 configured as shown in FIGS. 7 and 8 is inserted from the rear end side of the rear shaft 2 and mounted in the rear shaft 2 as shown in FIGS. 1 and 2. .
In this case, the linear rib 2b formed on the inner peripheral surface of the rear shaft 2 in the groove portion 16b formed in the first cam member 16 and the groove portion 17b formed in the second cam member 17 as described above. (See FIG. 6) is mounted so as to be accommodated.

  Then, the annular rib 3b formed in the small diameter portion 3a of the operation portion 3 shown in FIGS. 7 and 8 enters the back side of the annular rib 2c formed on the inner surface of the rear end portion of the rear shaft 2. As described above, by pushing the sliding piece drive unit 11, the operation unit 3 can be rotated and mounted in the rear shaft 2 so that the sliding piece drive unit 11 does not fall off.

FIG. 14 shows an example of a mechanical pencil unit 7 used as a cursive body, where (A) is an external view and (B) is a cross-sectional view.
As shown in FIG. 14A, the mechanical pencil unit 7 includes a tip member 7b having a writing portion 7a at the tip, a lead case 7c connected to the tip member 7b, the tip member 7b and the lead case 7c. The chuck spring 7d is disposed between the two.

Further, a tail plug 7e is attached to the rear end portion of the core case 7c, and this tail plug 7e is placed in the cylindrical portion 15a of the first sliding piece 15 in the sliding piece driving unit 11 (see FIG. 10). Press-fitted and connected.
As shown in FIG. 14B, the mechanical pencil unit 7 temporarily holds a metal chuck 7j for holding the writing core 7g, an annular fastener 7k surrounding the chuck 7j, and a writing core. A holding chuck 7n made of rubber is provided.

Next, the operation of the mechanical pencil having the above-described configuration will be described.
As already described, as shown in FIGS. 1 and 2, the mechanical pencil according to the present invention has the second state in which the writing part 7a and the knock part 21 are accommodated in the shaft cylinder, the writing part 7a and the knock part 21 are The first state protruding forward and rearward of the shaft cylinder is configured to be selectable by rotating the operation unit 3, and the writing core is drawn out from the writing unit 7 a by knocking the knock unit 21 in the first state. Act on.

In the second state shown in FIG. 1 in which the writing part 7a and the knock part 21 are accommodated in the shaft tube, the sliding piece drive unit 11 already described is in the state shown in FIG. That is, the pointed portion 15c (see FIG. 10) of the first sliding piece 15 is located at the intersection (see FIG. 12) of the cam bottom surface 16c and the cam inclined surface 16d of the first cam member 16. .
Further, the pointed portion 18c (see FIG. 11) of the second sliding piece 18 is positioned at the intersection (see FIG. 13) of the cam bottom surface 17c and the cam inclined surface 17d of the second cam member 17. .

  That is, the first sliding piece 15 and the second sliding piece 18 are close to each other, and as a result, the mechanical pencil unit 7 attached to the first sliding piece 15 as shown in FIG. The writing portion 7 a is accommodated in the front shaft 1, and the knock portion 21 attached to the second sliding piece 18 is also accommodated in the rear shaft 2.

In this state, when the operation portion 3 disposed at the rear end portion of the shaft cylinder is rotated to the right, the guide cylinder 12 is also rotated in the same direction, and the first and second accommodated in the dividing groove 12 c of the guide cylinder 12. The pointed portions 15c and 18c of the sliding piece are also rotationally driven in the same direction.
On the other hand, the first cam member 16 and the second cam member 17 each having a cam surface on which the pointed portions 15c and 18c slide are slid only in the axial direction as described above and do not rotate in the axial direction. .

Therefore, the pointed portions 15c and 18c of the first and second sliding pieces compress the first and second spring members 14 and 19 while compressing the first and second cam members 16 and 17 and the cam slopes 16d. , 17d.
Each of the pointed portions 15c and 18c reaches the cam top surfaces 16e and 17e that are flat in the circumferential direction of the first and second cam members 16 and 17, and then each of the pointed portions 15c and 18c It falls into the recessed portions 16f and 16f formed on the cam top surface.

In this state, the first sliding piece 15 and the second sliding piece 18 are separated from each other, whereby the mechanical pencil unit 7 attached to the first sliding piece 15 as shown in FIG. The writing portion 7a is projected from the front shaft 1 and the knock portion 21 attached to the second sliding piece 18 is also in the first state projected from the rear shaft 2.
Then, after the first state is selected, when the operation unit 3 is rotated leftward, the second state is made following the reverse of the above-described operation, and the state shown in FIG. 1 is restored.

The cam top surfaces 16e and 17e that are flat in the circumferential direction of the first and second cam members 16 and 17 are formed with concave portions 16f and 16f, respectively. Each pointed portion 15c, 18c is configured to fall.
As a result, when the first state in which the writing unit 7a and the knock unit 21 are projected before and after the shaft cylinder is selected, a moderate click feeling is provided for the rotation operation of the operation unit 3, and the first state has been reached. Can be received as a feel.

  Here, when the knocking portion 21 protruding from the rear end portion of the shaft cylinder is knocked in the state where the first state is selected, the forward movement by the knocking operation is the second sliding piece 18 in the state shown in FIG. The mechanical pencil unit 7 is sequentially transmitted to the second cam member 17, the first cam member 16, and the first sliding piece 15, and acts to push out the mechanical pencil unit 7 attached to the first sliding piece 15 from the rear end side.

The mechanical pencil unit 7 moves forward together with the tip member 6 and protrudes from the tip shaft 1 by the above-described action, but the hook-like member 6d of the tip member 6 is placed on the inner peripheral surface of the tip tube 5 along the way. The forward movement of the tip member 6 is stopped by contacting the formed step portion 5f.
Therefore, the stepped portion 7f (see FIG. 14) formed on the tip member 7b of the mechanical pencil unit 7 is brought into contact with the annular contact portion 6b in the tip member 6 and the forward movement operation is rejected. As a result, the chuck 7j shown in FIG. 14 advances in the tip member 7b while compressing the chuck spring 7d, and the writing core 7g is fed out.
That is, by repeating the knocking operation of the knocking portion 21 described above, the writing core 7g is sequentially drawn out from the writing portion 7a.

  According to the embodiment described above, the writing operation and the knocking operation and the return operation thereof are realized by a symmetrical combination of the first and second cam members and the first and second sliding pieces. In addition, since the main components described above are configured to move back and forth in accordance with the knocking operation of the knock unit together with the mechanical pencil unit, a smooth feeding operation of the writing core from the writing unit can be realized. The effect described in the column of the effect of the above-described invention can be obtained.

  In the embodiment described above, the first and second cam members 16 and 17 are linear in the rear shaft 2 so that the first and second cam members 16 and 17 can move only along the axial direction in the rear shaft 2. The rib 2b is provided, and the first and second cam members 16 and 17 are provided with the grooves 16b and 17b, respectively. However, a linear groove is formed in the rear shaft 2, and the first and first cam members 16 and 17 are formed. Similar effects can be obtained by forming straight ribs on the two cam members 16 and 17, respectively.

Moreover, in embodiment described above, although the case where the mechanical pencil unit 7 was utilized as a cursive body was demonstrated, a ball-point pen refill can also be utilized as a cursive body.
FIG. 15 shows an example of the ballpoint pen refill 23, where (A) is an external view and (B) is a cross-sectional view. As is well known, the ballpoint pen refill 23 is provided with a ballpoint pen tip 23a as a writing portion, and an ink containing tube 23b containing ink 23c is attached to the rear end side thereof.

When the above-described ball-point pen refill 23 is used, the rear end portion of the ink storage tube 23b is press-fitted into the cylindrical portion 15a of the first sliding piece 15 in the sliding piece drive unit 11 (see FIG. 10). It can be attached with.
In this state, when the operation unit 3 is rotated to the right, the writing part (ball pen tip 23a) of the ballpoint pen refill 23 can be protruded from the front end of the shaft cylinder, and writing with the ballpoint pen refill 23 becomes possible.

By the way, the mechanical pencil unit 7 or the ballpoint pen refill 23 described above is provided in a state of being stored in the refill storage container. This refill storage container is comprised from the container main body and the cap which covers the opening part of this container main body so that attachment or detachment is possible, for example, as disclosed by Unexamined-Japanese-Patent No. 2010-120684.
Therefore, a commercial form in which the cap of the refill storage container is provided so as to be dimensioned so that it can be attached as the knock part 21 is conceivable.

  That is, according to the mechanical pencil unit and the ballpoint pen refill, and according to the ink color of the ballpoint pen refill, the color of the cap of the refill storage container is specified, and the cap is knocked at the same time as the refill is replaced. By exchanging and using as 21, it is possible to provide a writing instrument that can easily identify the cursive character that is currently used.

  Furthermore, when the material of the knock part 21 is formed of a material substantially equivalent to the eraser and the writing body is a mechanical pencil, the writing line can be erased by the knock part 21, or a rubber elastic material such as rubber or elastomer can be used. Even when a ballpoint pen containing a thermochromic ink that is formed and discolored by frictional heat or an eraser erasable ink that peels off by the friction of an eraser is used, it is relatively easy to rub the writing line with the knock portion 21. It can be discolored or erased.

1 Lead shaft (shaft tube)
2 Rear shaft (shaft tube)
DESCRIPTION OF SYMBOLS 3 Operation part 5 Tip cylinder 6 Tip member 7 Mechanical pencil unit 8 Spring member 11 Sliding piece drive unit 12 Guide cylinder 12c Split groove 14 First spring member 15 First sliding piece 15c Pointed part 16 First cam member 16c Cam Bottom surface 16d Cam slope 16e Cam top surface 16f Concave portion 17 Second cam member 17c Cam bottom surface 17d Cam slope 17e Cam top surface 17f Concave portion 18 Second sliding piece 18c Pointed portion 19 Second spring member 21 Knock portion 23 Ball pen refill

Claims (6)

An operation unit capable of rotating around an axis relative to the shaft tube, a guide tube housed in the shaft tube that receives a rotational motion based on the rotation operation of the operation unit, and a shaft on the guide tube First and second sliding pieces arranged to be movable in the direction, and first and second moving the first and second sliding pieces in the axial direction in accordance with the rotational movement of the guide tube. A cam member,
A first state in which the first and second sliding pieces are separated from each other along the cam surfaces of the first and second cam members based on rotational movement in one direction of the guide cylinder; The second state in which the first and second sliding pieces are brought close to each other along the cam surfaces of the first and second cam members based on the rotational movement of the guide cylinder in the other direction. In the first state, the writing part of the mechanical pencil unit connected to the first sliding piece and the knocking part connected to the second sliding piece are It is made into the state which protruded from the front-end part and the rear-end part of the axial cylinder, respectively, and by knocking the knock part in this state, the first and second cam members, the first and second sliding pieces Is configured to move forward together with the mechanical pencil unit. A mechanical pencil characterized by that.   The first and second cam members are disposed in the shaft cylinder, and a rib projecting along the axial direction is formed on one of the outer peripheral surface of the cam member and the inner peripheral surface of the shaft cylinder. In the other, a groove is formed along the axial direction, and the rib is accommodated in the groove so that the first and second cam members are slidable in the axial direction in the shaft cylinder. The mechanical pencil according to claim 1, wherein the mechanical pencil is used.   A front end member that covers the front half of the mechanical pencil unit and that opens a front end through which the writing portion of the mechanical pencil unit can protrude is disposed in the shaft tube, and the knock operation of the knock portion is performed in the front end member. An abutting portion that rejects the forward movement of the mechanical pencil unit based on is formed, and a part of the mechanical pencil unit abuts on the abutting portion, so that the writing core is extended. The mechanical pencil according to claim 1 or 2.   The first and second cam members are formed in a cylindrical shape so as to be slidable in the axial direction with the guide tube as an axis, and the cam surface is a shaft of the first and second cam members. Are formed on both end surfaces in the direction toward the outer sides, respectively, and are cam bottoms that are flat in the circumferential direction, cam slopes that are inclined along the circumferential direction following the cam bottom surfaces, and cam slopes. Subsequently, a cam top surface that is flat in the circumferential direction is provided, and the first and second sliding pieces are brought into contact with the cam top surface to be brought into the first state. The mechanical pencil according to any one of claims 1 to 3, wherein the sliding piece is brought into the second state by abutting against the bottom surface of the cam.   The first and second cam members are formed with concave portions into which the pointed portions of the first and second sliding pieces fall, respectively, on the circumferentially flat cam top surfaces. The mechanical pencil according to claim 4.   First and second spring members for urging the first and second sliding pieces toward the cam surfaces of the first and second cam members are accommodated in the guide tube. The mechanical pencil according to any one of claims 1 to 5, wherein:

Images