JP2015033773A - Rotational delivery type writing instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotational delivery type writing instrument having a friction body with preferable assemble ability.SOLUTION: The rotational delivery type writing instrument comprising a thermo-chromic refill in a barrel body in a slidable manner is characterized in that: an outward projection on an extension part disposed on a rear end part of a slide case gets over an inward projection disposed inside the feeding cam, and the slide case is capable of rotating with respect to the feeding cam; and an insertion part disposed on a front end part of a holding member is inserted into the extension part of the slide case, and the rear end part of the feeding cam and the holding member are fitted each other.

Description

  The present invention relates to a rotary feeding type writing instrument capable of moving a pen tip of a writing instrument refill by rotating a rear axis with respect to a front axis.

  2. Description of the Related Art Conventionally, multi-core writing tools capable of selectively appearing and retracting the pen tip of a writing instrument refill are well known. In such a multi-core writing instrument, for example, in Japanese Patent Application Laid-Open No. 2002-293088, “Composite Writing Instrument”, a rotary feeding device in which a tail plug mounted on a rear end portion of a writing instrument refill is detachably connected to a sliding piece (sliding body). In Japanese Utility Model Laid-Open No. 4-1111489, “multi-core writing instrument of mechanical pencil and ball-point pen”, a slide type multi-core writing instrument is slidably connected to an ink storage cylinder of a refill for a writing instrument. A core writing instrument is disclosed.

  In the multi-core writing instrument described above, the applicant of the present invention disclosed in Japanese Patent Application Laid-Open No. 2013-49192 “Multi-core writing instrument”, a plurality of thermochromic writing instrument refills are arranged, and a crown is attached to the rear part of the shaft tube. A multi-core writing instrument in which an elastic portion having rubber-like elasticity for discoloring or erasing the handwriting of the cursive body is provided on the crown.

  By the way, as disclosed in Japanese Patent Application Laid-Open No. 2012-223964 “Rotary payout type writing instrument”, the inwardly extending protrusion in the sliding case is extended in the rotary feeding type writing utensil. As a result, the feed cam is fitted to the sliding case so as to be rotatable and not displaced in the longitudinal direction.

JP 2002-293088 A Japanese Utility Model Laid-Open No. 4-11489 JP 2013-49192 A JP 2012-223964 A

  However, as in Patent Document 4, in order to connect the sliding case and the feeding cam so as to be rotatable and not displaced in the longitudinal direction, the structure becomes complicated, such as providing an elastically deforming portion. When the crown and the friction body are attached to the rear part of the shaft cylinder as in Document 3, there is a problem that the total length becomes long.

  The present invention is intended to solve the above-described conventional problems, and to provide a rotary payout type writing instrument provided with a friction body having good assemblability.

  In order to achieve the above object, the present invention firstly stores a thermochromic ink in an ink storage cylinder, and a pen tip capable of ejecting the thermochromic ink at the front end of the ink storage cylinder. A thermochromic writing instrument refill mounted directly or via a nib holder is slidably disposed within a main body having a front shaft and a rear shaft, and the refill is slid into the rear shaft. A sliding case provided with a moving groove; and a feeding cam that can rotate on the outer peripheral surface of the sliding case by rotating the rear shaft with respect to the front shaft. The rotary writing instrument is provided with a sliding body that slides in conjunction with a refill, and includes a friction body having elasticity via a holding member at a rear end portion of the rear shaft, The moving case and the feeding cam are arranged so that an inward projection provided in the feeding cam is located behind the sliding case. The outward projection of the extended portion provided in the portion climbs over, and the feeding cam is rotatably arranged with respect to the sliding case, and the insertion portion provided at the front end portion of the holding member is the sliding case The rear end portion of the feeding cam and the holding member are mounted. In the present invention, “front” refers to the pen tip side, and “rear” refers to the opposite side.

  According to the first configuration, the sliding case and the feeding cam get over the inward projection provided in the feeding cam, and the outward projection of the extending portion provided in the rear end portion of the sliding case. The feeding cam is rotatably arranged with respect to the sliding case, and an insertion portion provided at a front end portion of the holding member is inserted into an extending portion of the sliding case so that the feeding cam is By attaching the end portion and the holding member, the extension portion of the sliding case is prevented from bending inward by the insertion portion of the holding member after the feeding cam and the sliding case are fitted. Therefore, the assemblability is easy and the sliding case can be made difficult to come off.

  Second, the extending portion of the sliding case is provided with a slit extending along the longitudinal direction from the rear end.

  According to the second configuration, the slit extending from the rear end along the longitudinal direction is provided in the extension portion of the sliding case, so that the extension portion provided in the rear end portion of the sliding case is directed outward. When the projection gets over the inward projection provided in the feeding cam, the extending portion is easily bent inward, and the sliding case and the feeding cam can be easily fitted.

  Third, the holding member is detachably screwed with a female screw portion provided in a rear end portion of the feeding cam and a male screw portion provided on a side surface of the holding member.

  According to the third configuration, the holding member can be detachably attached without complicating the structure, and as a result, the friction body can be easily replaced when the friction body becomes dirty. Can do.

  The present invention was able to provide a rotary drawing-type writing instrument provided with a friction body with good assemblability.

It is a longitudinal cross-sectional view which shows the rotation payout type writing instrument in Embodiment 1. FIG. FIG. 2 is an enlarged vertical cross-sectional view of a main part, partly omitted in FIG. 1. It is an external view which shows the sliding case in FIG. It is a perspective external view which shows the state before mounting | wearing of the holding member in FIG. It is an expanded longitudinal cross-sectional view of the refill for writing instruments.

  Next, an embodiment of the rotary payout type writing instrument of the present invention will be described with reference to the drawings, but the present invention is not limited to the following embodiment.

A first embodiment of the present invention is shown in FIGS.
The rotary drawing-type writing instrument 1 includes a front shaft 2 and a rear shaft 3 via a connecting tube 4, and the front shaft 2 and the rear shaft 3 are connected to each other in a relatively rotatable manner. The refill 21 for the writing instrument, the sliding case 6 provided with a plurality of sliding grooves 6D for holding the refill 21 for the writing instrument and the other refill 31 for the writing instrument having a different ink color, and the rear shaft 3 as the front shaft 2. A refill for a writing instrument having a feeding cam 5 which can rotate on the outer peripheral surface of the sliding case 6 by rotating with respect to the sliding groove 6D, and a sliding body 7 having a cam locking projection 7A connected to the sliding groove 6D. 21 is urged from the elastic body 10 made of a coil spring to the rear of the front shaft 2 on the side opposite to the front end opening 2A, and a sliding body 8 having a cam locking projection 8A in another sliding groove is provided. The other refill 31 for the writing instrument is connected to the front shaft by the elastic body 11 made of a coil spring. This is a conventionally known rotary-drawing-type writing instrument that is arranged to be biased to the rear side opposite to the front end opening 2 </ b> A, and by removing the front shaft 2 from the connecting cylinder 4, the refill for the writing instrument 21 and 31 can be exchanged.

  The feeding cam 5 is formed with a concave groove 5A at the front end of the cam slope, the cam locking projection 7A of the sliding body 7 is brought into contact with the cam slope, and the cam locking projection 7A is rotated as the feeding cam 5 rotates. Moves along the cam slant surface and engages with the concave groove 5A, so that the pen tip 23 of the writing instrument refill 21 with the sliding member 7 attached thereto or the pen tip of another writing instrument refill 31 with the sliding member 8 attached thereto. 33 can be projected and retracted from the front end opening 2 </ b> A of the front cylinder 2.

  The sliding body 7 includes a connecting portion 7B at the front end. Although not shown, the connecting portion 7B includes a shaft portion that is inserted into the tail plug 26 of the writing instrument refill 21 and a bulging portion provided at a front end portion of the shaft portion. Moreover, the said bulging part is made into the shape which cut off the front end part of a spherical body, and the side surface which opposes.

  Further, a brass holding member 11 is provided at the rear end portion of the rear shaft 3, and a female screw portion 5B provided in the rear end portion of the feeding cam 5 and a male screw portion 11B provided on the front end side surface of the holding member 11. The rear end of the holding member 11 is screwed so as to be positioned behind the rear shaft 3. Also, a rubber-like elastic friction body 13 made of polyester elastomer is fitted to the holding member 11, and an outer projection provided on the mounting portion of the friction body 13 is fitted over the inner projection of the holding member 11. It is attached by. The handwriting of the thermochromic ink can be thermally decolored or discolored by heat generated by pressing and rubbing the friction body 13 against the writing surface. Further, on the outer side of the friction body 13, the crown 12 is detachably screwed to the male thread portion of the holding member 11 and the female thread portion on the inner surface of the crown 12. A clip 14 fixed between the rear shaft 13 and the holding member 11 is attached to the rear end portion of the rear shaft 13, and an O-ring 14 made of an elastic body is attached to the male screw portion 11B of the holding member 11. The loosening of the screw of the crown 12 is suppressed.

  Further, the feeding cam 5 and the sliding case 6 have the inward projection 5A provided in the feeding cam 5 and the outward projection 6B of the extending portion 6A provided at the rear end portion of the sliding case 6, The feeding cam 5 is rotatably arranged with respect to the sliding case 6. In addition, the extending portion 6A extending rearward from the rear end portion of the sliding case 6 is provided with a slit 6C extending in the longitudinal direction from the rear end, and the outward projection 6B of the extending portion 6A is provided. When overcoming the inward projection 5A provided in the feeding cam 5, it is easy to bend inward so that it can be easily passed over and fitted.

  The front end portion of the holding member 11 is provided with an insertion portion 11A extending forward and having a smaller diameter than the front end portion of the holding member 11 and the inner diameter of the extension portion 6A of the sliding case 6. 11A is inserted into the extending portion 6A of the sliding case 6, and a female screw portion 5B provided in the rear end portion of the feeding cam 5 and a male screw portion 11B provided on the front end side surface of the holding member 11 are provided. Since it is screwed, the extension portion 6A of the sliding case 6 is prevented from bending inward by the insertion portion 11A of the holding member 11 after the feeding cam 5 and the sliding case 6 are fitted. Yes.

  The sliding case 6 is fixed to the connecting cylinder 4, and the feeding cam 5 has a convex portion 5 </ b> C provided at the rear end of the feeding cam 5 via a concave portion 14 </ b> A of the clip 14. Since the concave and convex portions 3A provided in the opening of the part are fitted into the concave and convex portions to suppress the rotation, the holding member 11 is screwed and the feeding cam 5 is fixed to the rear shaft 3, the rear shaft 3 is fixed to the front shaft 2. When rotating, the rear shaft 3 and the feeding cam 5 can be rotated integrally.

  The writing instrument refill 21 includes a pen tip 23, a pen tip holder 25 in which a rear end portion 23B of the pen tip 23 is press-fitted and fixed to a front end portion 25A, and a rear end portion 25B of the pen tip holder 25 is a front end portion. And an ink containing cylinder 22 press-fitted and fixed to 22A. A front end portion 26A of the tail plug 26 is press-fitted and fixed to the rear end portion 22B of the ink containing cylinder 22.

  The pen tip 23 is composed of a ball pen tip in which a ball 24 is rotatably held in a ball holding chamber of a pen tip front end 23A, and the ball 24 is always placed behind the ball 24 at the front end of the pen tip. A coil spring 29 is provided to press against the inner wall of the part.

  The nib holder 25 is formed of a transparent synthetic resin (polypropylene resin), and the rear end portion 25B of the nib holder 25 is a cylindrical body having substantially the same outer diameter. In the meantime, the writing instrument ink 27 is visible from the outside through the nib holder 25.

  The tail plug 26 is made of an opaque synthetic resin (polyacetal resin), and includes a front end portion 26A that is inserted into the rear end portion 22B of the ink containing cylinder 22, and a rear end portion 26B that is located behind the ink containing cylinder 22. have.

  The ink containing cylinder 22 is a cylindrical metal pipe made of stainless steel (SUS304) with both ends opened. A protrusion 22 </ b> C that protrudes toward the inside of the ink storage cylinder 22 is provided around the front end 22 </ b> A of the ink storage cylinder 22. The rear end portion 22B of the ink containing cylinder 22 is provided with two protrusions 22D that protrude toward the inside of the ink containing cylinder 22 at two different locations in the circumferential direction.

  A black thermochromic ink 27 is accommodated inside the ink container 22, the nib holder 25, and the nib 23. The ink container 22 contains an ink follower 28 made of a high-viscosity fluid that is disposed at the rear end of the thermochromic writing instrument ink 27 and moves forward with ink consumption.

  The writing instrument refill 21 is detachably connected to an overhanging protrusion provided in the rear end portion 26B of the tail plug 26 by an overhanging portion provided in the connecting portion 7B of the sliding body 7, The sliding body 7 and the writing instrument refill 21 are arranged to slide in conjunction with each other. The bulging portion 27B is swingable with respect to the tail plug 26, and an excessive inclination is suppressed by the protruding piece 7C of the sliding body 7.

  Further, the writing instrument refill 21 will be described in detail. A pen tip 23 composed of a ballpoint pen tip that rotatably holds a φ24 mm ball 24 is attached to the front end portion 22A of the ink containing cylinder 22 via a pen tip holder 25. It is. The ink container 22 contains a reversible thermochromic microcapsule pigment having an average particle size of 0.5 μm, and an ink viscosity at 1 rpm in an EM type rotational viscometer is 1020 mPa · s (25 ° C.). A thermochromic writing instrument ink 27 with an ink viscosity at 100 rpm of 84 mPa · s (25 ° C.) and a shear thinning index of 0.48, and an ink follower 28 directly accommodated at the rear end of the ink. It is. The ink viscosity is preferably 100 rpm and 40 to 200 mPa · s (25 ° C.) in an EM type rotational viscometer.

  The writing instrument refill 21 is manufactured by press-fitting a rear end 23B of a pen tip 23 made of a ball pen tip, which has been manufactured in advance, into a front end 25A of a pen tip holder 25. A rear end portion 25B of the nib holder 25 is press-fitted and attached to the front end portion 22A.

  Furthermore, after the thermochromic writing instrument ink 27 and the ink follower 28 are accommodated in the ink accommodating cylinder 22, the front end portion 26 </ b> A of the tail plug 26 is inserted into the rear end portion 22 </ b> B of the ink accommodating cylinder 22. After that, the front end portion of the ink containing cylinder 22 is pressed while air cooling from the outside to the inside, and a protrusion 22C protruding toward the inside of the ink containing cylinder 22 is provided around the pen tip. In addition to increasing the removal force of the holder 25, ink leakage from between the ink containing cylinder 22 and the pen tip holder 25 is suppressed. Further, the rear end portion of the ink containing cylinder 22 is also pressed from the outside to the inside, and protrusions 22D that protrude toward the inside of the ink containing cylinder 22 are provided at two places in different circumferential directions, and the tail plug 26 is attached, and the removal force is enhanced. Finally, the writing tool refill 21 is subjected to centrifugal defoaming to obtain a writing tool refill 21 comprising a thermochromic writing tool refill.

  Although the outer shape of the tail plug 26 is not particularly limited, the writing tool refill 21 is placed in the shaft cylinder by making the outer diameter of the rear end portion 26B of the tail plug 26 equal to or smaller than the outer diameter of the ink containing cylinder 22. Since it becomes easy to insert, it is preferable.

  The ink storage cylinder, shaft cylinder, and holding member in the present invention are made of metal such as stainless steel, aluminum, aluminum alloy, copper, copper alloy, titanium, titanium alloy, nickel, nickel alloy, iron, and iron alloy. Materials, and synthetic resins such as polypropylene resin, polyacetal resin, polycarbonate resin, etc., and the ink container is preferably a metal material in consideration of light shielding properties and gas permeability, and stainless steel in consideration of cost and corrosion resistance. preferable. The holding member is also preferably made of a metal material in order to enhance the effect of preventing the sliding case from coming off.

  In addition, examples of the tail plug, the sliding body, and the nib holder in the present invention include synthetic resin materials such as polypropylene resin, polyacetal resin, and acrylonitrile styrene resin. Preferably, polypropylene is preferable for the pen tip holder in consideration of transparency and ink visibility.

  The writing instrument ink is preferably a reversible thermochromic ink. The reversible thermochromic ink is a heat decoloring type that decolors by heating from a colored state, a color memory retaining type that reversibly stores and retains a colored state or a decolored state in a specific temperature range, or from a decolored state Various types such as a heating coloring type that develops color by heating and returns to a decolored state by cooling from the colored state can be used alone or in combination.

  The coloring material contained in the reversible thermochromic ink includes conventionally known (a) electron donating color-forming organic compounds, (b) electron-accepting compounds, and (c) color reactions of both. A reversible thermochromic pigment in which a reversible thermochromic composition containing at least the essential three components of a reaction medium for determining the occurrence temperature of the polymer is encapsulated in a microcapsule is preferably used.

  The above-mentioned friction body is preferably a rubber-like elastic body such as a rubber or an elastomer that is rich in elasticity and can generate frictional heat by generating appropriate friction during friction. Specific examples include synthetic resins (rubber and elastomer) having elasticity, such as silicone resin, SBS resin (styrene-butadiene-styrene copolymer), and SEBS resin (styrene-ethylene-butylene-styrene copolymer). ), Fluorine resin, chloroprene resin, nitrile resin, polyester resin, olefin resin, ethylene propylene diene rubber (EPDM) and the like. Further, the friction body may be formed integrally with the rear shaft or attached as a separate member. Although it is possible to rub the handwriting by using an eraser, it is preferable to use the friction body as described above, because erase scraps are generated at the time of friction, and the friction body is made of silicone resin or SEBS resin. (Styrene ethylene butadiene styrene block copolymer) is preferably used.

  In the present embodiment, for the sake of convenience, a ballpoint pen refill using a ballpoint pen tip as an example of a pen tip is illustrated. However, examples of the writing instrument refill include a marking pen. Further, in the present embodiment, the front shaft and the rear shaft are rotatably connected via the connecting cylinder, but the connection structure between the front shaft and the rear shaft is not particularly limited, and the front shaft A shaft tube structure conventionally known as a rotary feeding type multi-core writing instrument such as a structure in which a base is attached to the front end portion can be appropriately selected and used.

  In the present embodiment, for the sake of convenience, the mechanism of the multi-core writing instrument that selectively causes the pen tip to appear and disappear from the front end opening of the shaft cylinder by a rotating operation is illustrated, but a single core may be used. Moreover, although the multi-core writing instrument which accommodated the refill for writing instruments which consists of the refill for two thermochromic writing instruments in which a color differs in a shaft cylinder is illustrated, three or more refills for writing instruments, oil-based ball-point pen refill, and water-based gel ink are illustrated. Different refills for writing instruments such as ballpoint pen refills and mechanical pencils can be used in combination.

  The rotary drawing type writing instrument of the present invention can be widely implemented as a multi-core writing instrument in which thermochromic property and a refill for writing instrument are detachably connected.

DESCRIPTION OF SYMBOLS 1 Rotation | feed-out type writing instrument 2 Front shaft 2A Front end opening 3 Rear shaft 3A Concavity 4 Connecting cylinder 5 Feeding cam 5A Inner projection 5B Female thread portion 5C Convex portion 6 Sliding case 6A Extension portion 6B Outward projection 7, 8 Slider 7A Cam locking projection 7B Connecting part 7C Shaft part 7D Swelling part 7E Projection piece 7F Step part 9, 10 Elastic body 11 Holding member 11B Male thread part 12 Head crown 13 Friction body 14 Clip 21, 31 Refill for writing instrument 22, 32 Ink Housing cylinder 22A, 32A Front end 22B, 32B Rear end 22C, 32C Projection 22D, 32D Projection 23, 33 Pen tip 24, 34 Ball 25, 35 Pen tip holder 26, 36 Tail plug 26A Front end 26B Rear end 27, 37 Ink for writing instruments 28, 38 Ink follower 29, 39 Coil spring

Claims (3)

Thermochromic property in which thermochromic ink is contained in an ink containing cylinder, and a pen tip capable of ejecting the thermochromic ink is mounted directly or via a pen tip holder on the front end of the ink containing cylinder The refill for writing instruments is slidably disposed in a shaft cylinder body having a front shaft and a rear shaft, a sliding case having a sliding groove in the rear shaft, and a rear shaft as a front shaft. A sliding cam that can rotate on the outer peripheral surface of the sliding case by rotating with respect to the sliding groove, and a sliding body that slides in conjunction with the refill for the writing instrument is disposed in the sliding groove; A rotary feeding-type writing instrument comprising a friction body having elasticity via a holding member at a rear end portion of the rear shaft, wherein the sliding case and the feeding cam are provided inwardly in the feeding cam. The projecting part of the extended part provided at the rear end of the sliding case gets over the The sliding case is rotatably arranged with respect to the feeding cam, and an insertion portion provided at a front end portion of the holding member is inserted into an extending portion of the sliding case, and a rear end portion of the feeding cam And a rotary feeding type writing instrument, wherein the holding member is mounted. The rotary extending type writing instrument according to claim 1, wherein a slit extending along a longitudinal direction from a rear end is provided in an extending portion of the extending cam. The said holding member is detachably screwed with the internal thread part provided in the rear-end part of the feeding cam, and the external thread part provided in the side surface of the said holding member. Rotating payout type writing instrument.

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