WO2012091036A1 - ボールペンチップ及びそれを用いたボールペン - Google Patents
ボールペンチップ及びそれを用いたボールペン Download PDFInfo
- Publication number
- WO2012091036A1 WO2012091036A1 PCT/JP2011/080267 JP2011080267W WO2012091036A1 WO 2012091036 A1 WO2012091036 A1 WO 2012091036A1 JP 2011080267 W JP2011080267 W JP 2011080267W WO 2012091036 A1 WO2012091036 A1 WO 2012091036A1
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- WIPO (PCT)
- Prior art keywords
- ball
- ink
- contact surface
- ballpoint pen
- contact
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
- B43K—IMPLEMENTS FOR WRITING OR DRAWING
- B43K1/00—Nibs; Writing-points
- B43K1/08—Nibs; Writing-points with ball points; Balls or ball beds
- B43K1/084—Ball beds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
- B43K—IMPLEMENTS FOR WRITING OR DRAWING
- B43K1/00—Nibs; Writing-points
- B43K1/08—Nibs; Writing-points with ball points; Balls or ball beds
- B43K1/082—Balls
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
- B43K—IMPLEMENTS FOR WRITING OR DRAWING
- B43K7/00—Ball-point pens
Definitions
- the present invention includes a ball holding chamber for holding a ball, an ink circulation hole formed in the center of the bottom wall of the ball holding chamber, and a plurality of ink circulation grooves extending radially from the ink circulation hole.
- a ballpoint pen tip that causes a part of the ball held in the ball holding chamber to protrude from the tip end edge and to hold the ball rotatably.
- a ball holding chamber for holding a ball, an ink flow hole formed in the center of the bottom wall of the ball holding chamber, and a plurality of ink flow grooves extending radially from the ink flow hole,
- a ball-point pen tip that projects a part of the ball held in the ball holding chamber from the tip end edge and holds the ball in a rotatable manner by caulking the tip end of the tip body having Are known.
- Japanese Patent Laid-Open No. 2001-39077 discloses that the inner portion of the ball seat is lifted by the spring back property of the chip metal material by hammering that presses the ball for forming the ball seat from the tip end side. It is disclosed that a counterbore can be formed in which the outer portion of the seat is not in contact with the ball.
- the ballpoint pen tip manufacturing method disclosed in Japanese Patent Laid-Open No. 2001-39077 requires a new process for forming a counterbore hole, which increases the manufacturing cost and improves the ink distribution to the ball seat. Therefore, it does not adjust the ink flow of the ball seat, and it is difficult to suppress the wear of the ball seat.
- fluid lubrication formed by the ball pen ink entering between the ball and the ball seat, the contact surface between the ball and the ball seat There are boundary lubrication in which the two are in direct contact and mixed lubrication in which fluid lubrication and boundary lubrication are mixed.
- the inks used for the ballpoint pen can be roughly classified into water-based ballpoint pen ink, water-based or oil-based ballpoint ink provided with shear thinning viscosity, and oil-based ballpoint pen ink.
- water-based or oil-based ink for ballpoint pens and oil-based ballpoint pen inks to which shear thinning has been imparted have a low viscosity for improving the writing feeling.
- the tendency to be in the boundary lubrication state is strong, and as a result, the ball and the ball seat are easily worn.
- An object of the present invention is to provide a ballpoint pen tip with a simple structure that has a good writing feeling and that suppresses wear of the ball and ball seat.
- the present invention includes a ball holding chamber for holding a ball, an ink circulation hole formed in the center of the bottom wall of the ball holding chamber, and a plurality of ink circulation grooves extending radially from the ink circulation hole.
- a ballpoint pen tip that causes a part of the ball held in the ball holding chamber to protrude from the tip end edge and to hold the ball rotatably.
- a curved abutting surface having a curvature different from the curvature of the ball is provided on the bottom wall of the ball holding chamber, and the ball is in contact with a part of the abutting surface.
- a first gap that gradually decreases from the ink circulation hole side to the abutting portion is formed between the ball and the contact surface.
- a ballpoint pen tip, wherein the second gap smaller gradually from the front end side of the ink passage grooves to the contact portion is formed from the side.
- the first gap that gradually decreases from the ink circulation hole side and the second gap that gradually decreases from the front end side of the ink circulation groove are formed, thereby abutting against the ball. It is easy to maintain a state of fluid lubrication or mixed lubrication between the surface (contact portion). Thereby, the wear of the contact surface (contact portion) is suppressed. Furthermore, it was confirmed that the present invention is effective in terms of stable ink outflow, smooth ink return, and improved writing feeling.
- Such a ball-point pen tip can be widely used as a ball-point pen, but can be suitably used particularly for a ball-point pen using a ball having a small diameter of 0.5 mm or less by suppressing wear of the contact surface.
- the present inventor has analyzed the effect of forming the first gap and the second gap as follows. That is, when the ball rotates, the ballpoint pen ink is dragged from the ink circulation hole into the first gap, and a layer of the ballpoint pen ink is formed between the ball and the contact surface. Pressure is generated by this ink layer, and a force to float the ball is generated (wedge effect). This suppresses wear of the bottom wall. When the curvature of the ball and the curvature of the contact surface are completely the same and there is no first gap, ink is not dragged between the ball and the contact surface, so that the effect of suppressing wear is obtained. I can't get it.
- the ink for the ballpoint pen that could not protrude onto the paper surface is returned from the ball holding chamber to the contact surface.
- an ink layer is also formed in the second gap.
- the shape of the contact surface is a curved surface having a curvature different from the curvature of the ball. It is.
- the opening on the ink circulation hole side is preferably 10 ⁇ m or less in length in the axial direction, more preferably 0.001 ⁇ m to 5 ⁇ m, and most preferably 0.001 ⁇ m to 1 ⁇ m.
- the first gap is formed so as to gradually become smaller from the ink circulation hole side, a high wedge effect (force to float the ball) can be obtained in the vicinity of the contact portion of the ball. Thereby, wear of the contact surface (particularly the contact portion) can be effectively suppressed.
- the contact portion is located closer to the tip end portion side than the center position of the contact surface in the axial direction.
- the length of the first gap can be ensured longer than the length of the second gap, and high wear resistance can be ensured.
- the amount of ball-point pen ink returning from the ball holding chamber to the contact surface is small, and therefore the first gap is larger than the second gap. This is because it is effective in terms of generating the wedge effect.
- the contact surface is axisymmetric with respect to an axis, and the contact portion is positioned so as to circulate in a circumferential direction of the contact surface.
- the first gap and the second gap are formed with a good balance, it is easier to maintain the state of fluid lubrication or mixed lubrication.
- the contact portion is positioned substantially evenly in the circumferential direction of the contact surface. Also in this case, since the first gap and the second gap are formed in a well-balanced state, it is easier to maintain the state of fluid lubrication or mixed lubrication. Further, in this case, the contact portion is preferably located at a position away from the ink circulation groove, particularly preferably at a substantially intermediate position of the ink circulation groove in the circumferential direction. In this case, even if the abutting portion is worn, there is little influence on the function of the ink circulation groove, so that a stable ink flow can be maintained.
- the present invention provides a ballpoint pen refill in which a ballpoint pen tip having the above-described features is mounted directly or through a tip holder on an ink storage cylinder, and ink for the ballpoint pen is stored in the ink storage cylinder.
- the ink for a ballpoint pen contains at least fine particles, and the size of the fine particles is smaller than the length in the axial direction of the opening on the ink circulation hole side of the first gap. Refill.
- good handwriting and writing feeling can be obtained. This is considered to be because fine particles enter the first gap to improve lubricity and easily maintain the gap between the ball and the contact surface. Further, it is considered that the ink layer between the ball and the contact surface can be easily maintained even when the fine particles exhibit a repelling function like a cushion.
- the above-mentioned fine particles are not particularly limited, and examples thereof include pigments such as inorganic pigments, organic pigments and processed pigments, and organic fine particles and inorganic fine particles.
- pigments include carbon black, pearl pigments, fluorescent pigments.
- examples thereof include pigments, phosphorescent pigments, complementary color pigments, microcapsule pigments, and specific examples of the fine particles include resin fine particles such as acrylic, silicone, and polyethylene, fine alumina particles, and fine silica particles.
- the size of the fine particles in the present invention refers to the average size to the last, and indicates the average particle size in the case of a substantially spherical shape, and can be obtained by measurement by centrifugal sedimentation type or laser diffraction type. it can.
- the size of the fine particles is smaller than the length in the axial direction of the opening on the ink circulation hole side of the first gap, and is 0.001 ⁇ m to less than 10 ⁇ m, preferably 0.001 ⁇ m to 5 ⁇ m.
- the shape of the fine particles is most preferably a true sphere or a substantially sphere.
- the content of the fine particles is preferably 0.1 to 15% by mass with respect to the total amount of the ink composition.
- the present invention provides a ballpoint pen tip having a feature as described above, wherein a lubricating coating layer is provided on the surface of the ball and / or the surface of the contact surface. is there.
- the contact resistance between the ball and the contact surface or the inner wall of the chip can be remarkably reduced by the synergistic effect of the lubrication coating layer and the fluid lubrication or mixed lubrication by the ink layer described above.
- the writing feeling can be remarkably improved.
- the lubricating coating layer diamond-like carbon (DLC), tungsten disulfide (WS 2 ), molybdenum disulfide (MoS 2 ), graphite, fluorine-containing polymer such as tetrafluoroethylene (PTFE), silicone resin, etc.
- the method for coating the lubricating coating layer is not particularly limited, and examples include vacuum deposition, ion deposition, physical vapor deposition, chemical vapor deposition, and vacuum arc vapor deposition. You may make it coat
- diamond-like carbon (DLC) is most preferably used in consideration of wear resistance and lubricity.
- the material of the ball is not particularly limited, such as tungsten carbide super hard material, ceramic material such as zirconia, stainless steel material and the like.
- the chip body is not particularly limited, such as stainless steel, copper alloy, and aluminum.
- FIG. 2 is a cross-sectional view taken along line AA in FIG. 1. It is a principal part expanded longitudinal sectional view which shows the ball-point pen tip of 1st Embodiment. It is a principal part expanded longitudinal cross-sectional view which shows the ball-point pen tip of 2nd Embodiment.
- FIG. 6 is a cross-sectional view taken along line BB in FIG. 5. It is explanatory drawing which shows the state of the contact surface in FIG. It is a figure which shows the ball-point pen refill using the ball-point pen tip of 1st Embodiment.
- FIG. 10 is a cross-sectional view taken along line AA in FIG. 9. It is a principal part expanded longitudinal cross-sectional view which shows the ball-point pen tip of 4th Embodiment.
- FIG. 14 is a cross-sectional view taken along the line BB in FIG. 13. It is explanatory drawing which shows the state of the contact surface in FIG. It is a figure which shows the ball-point pen refill using the ball-point pen tip of 3rd Embodiment.
- a ballpoint pen tip 1 according to the first embodiment shown in FIGS. 1 to 4 includes a ball holding chamber 3 for holding a ball 9 and an ink formed at the center of the bottom wall 4 of the ball holding chamber 3.
- the ball-point pen tip 1 is configured to project a part of the ball 9 held in the holding chamber 3 from the tip end edge of the tip and rotatably hold the ball 9.
- the chip body 2 is made of a stainless steel wire.
- the ink circulation hole 7 is continuous with the chip rear hole 8.
- the ball 9 has a diameter of 0.5 mm and is made of tungsten carbide.
- the bottom wall 4 of the ball holding chamber 3 is provided with a curved contact surface 5 having a curvature different from the curvature of the ball 9. It abuts against the abutment part which is a part.
- a first gap S1 that gradually decreases from the ink circulation hole 7 side is formed between the ball 9 and the contact surface 5 from the ink circulation hole 7 side to the contact portion.
- a second gap S2 that gradually decreases from the leading end side of the ink circulation groove 6 is formed from the leading end side of the ink circulation groove 6 to the contact portion.
- Such a ball-point pen tip 1 is manufactured as follows. That is, for example, a stainless steel wire having a diameter of 2.3 mm and a hardness of 230 Hv to 280 Hv is cut to a desired length, and the ball holding chamber 3, the ink circulation holes 7, and the ink circulation grooves extending radially from the ink circulation holes 7. 6 is produced. Thereafter, hammering is performed from the tip end portion 2a side in a state where the ball 9 is placed on the bottom wall 4 of the ball holding chamber 3, and a curved surface having a larger radius of curvature than the ball 9 is formed by the springback property. The tip end 2a is caulked inward.
- a curved contact surface 5 (particularly a mortar shape) having a curvature different from that of the ball 9 is formed.
- Contact is made at the contact portion 5a on the circumferential line around the center.
- a first gap S1 and a second gap S2 are formed between the ball 9 and the contact surface 5.
- the first gap S1 and the second gap S2 are formed, fluid lubrication or mixed lubrication is performed between the ball 9 and the contact surface 5 (contact portion 5a). Easy to maintain. For this reason, the wear of the contact surface (contact portion) is suppressed.
- the ball protruding from the tip end edge of the ball 9 is 20% of the ball diameter
- the caulking angle ⁇ is 90 degrees
- the vertical clearance (movable distance) of the ball 9 is Is 15 ⁇ m
- the inclination angle ⁇ of the bottom wall 4 is 135 degrees (see FIG. 2).
- the length H of the opening in the axial direction on the ink circulation hole 7 side of the first gap S1 is 0.9 ⁇ m (see FIG. 4).
- a curved seal surface 2b is formed on the inner wall of the tip end portion 2a.
- the tip edge of the contact surface 5 in the longitudinal section of FIG. 2 and the tip edge of the seal surface 2b facing each other across the contact surface 5 and the axis J see FIG. 1 .
- the intersection K of the line segments K1, K2 passes through the approximate center C of the ball.
- the bias of the ball 9 is suppressed and the ball 9 is unlikely to be detached from the contact surface 5.
- the rotation of the ball 9 is smooth, the gap between the ball 9 and the sealing surface 2b is easily maintained, and therefore, a stable ink outflow amount can be realized and the ink can be easily returned. Can play.
- uneven wear of the contact portion 5a and the seal surface 2b due to the rotation of the ball 9 can be suppressed.
- the ballpoint pen tip 11 of the second embodiment shown in FIGS. 5 to 7 is also formed in the center of the ball holding chamber 13 for holding the ball 9 and the bottom wall 14 of the ball holding chamber 13.
- the tip end portion 12a of the tip body 12 having the formed ink circulation holes 17 and a plurality (four in this example) of ink circulation grooves 16 extending radially from the ink circulation holes 17 inside.
- the chip body 12 is also made of a stainless steel wire.
- the ink circulation hole 17 is also continuous with the chip rear hole 18.
- the ball 9 has a diameter of 0.5 mm and is made of tungsten carbide.
- the bottom wall 14 of the ball holding chamber 13 is provided with a curved contact surface 15 having a curvature different from the curvature of the ball 9, and the ball 9 is a part of the contact surface 15. It comes to contact
- the four positions in the circumferential direction of the contact surface 15 are formed.
- the balls 9 are in contact with each other in a substantially dotted manner. That is, these four places serve as contact portions 15a.
- the junction T2 between the contact surface 15 and another ink circulation groove 16 is obtained.
- the approximate center position between D and E is the highest in the height of the contact surface 15, and the ball 9 is in contact with the contact portion 15a which is the substantially top portion.
- a first gap S1 that gradually decreases from the ink circulation hole 17 side is formed between the ball 9 and the contact surface 15 from the ink circulation hole 17 side to the contact portion.
- a second gap S2 that gradually decreases from the leading end side of the ink circulation groove 16 is formed from the leading end side of the ink circulation groove 16 to the contact portion.
- a third gap S3 between the ball 9 and the contact surface 15 is exposed in the vicinity of the joints T1 and T2 between the contact surface 15 and the ink circulation groove 16. .
- Such a ball-point pen tip 11 is manufactured as follows. That is, for example, a stainless steel wire having a diameter of 2.3 mm and a hardness of 230 Hv to 280 Hv is cut to a desired length, and the ball holding chamber 13, the ink circulation hole 17, and the ink circulation groove extending radially from the ink circulation hole 17. 16 is produced. Thereafter, hammering is performed from the tip end portion 2a side while a molding hammering ball different from the ball 9 is placed on the bottom wall 4 of the ball holding chamber 3, and the radius of curvature is increased by the spring back property. A curved surface is formed in which the four portions serving as the contact portions 15a are raised in the large overall curved surface.
- the hammering ball is replaced with the regular ball 9, and the tip end 2a is caulked inward.
- the contact surface 15a as described above is formed, and the first gap S1, the second gap S2, and the third gap S3 are formed between the ball 9 and the contact surface 15.
- the first gap S1, the second gap S2, and the third gap S3 are formed, so that the fluid between the ball 9 and the contact surface 15 (contact portion 15a) is fluid. Easy to maintain lubrication or mixed lubrication. For this reason, the wear of the contact surface (contact portion) is suppressed.
- the contact portion 15a is located away from the ink circulation groove 16, even if the contact portion 15a is worn, there is little influence on the function of the ink circulation groove 16. For this reason, it is possible to maintain a stable ink flow.
- FIG. 8 shows an example in which the ballpoint pen tip 1 according to the first embodiment is incorporated in the ballpoint refill 21.
- the ball-point pen tip 1 of the first embodiment is attached to the tip of the ink containing cylinder 22.
- the ink containing cylinder 22 contains a pigment having an average particle diameter of 0.5 ⁇ m, and measured at 20 ° C. measured by AR-G2 (stainless steel 40 mm 2 ° rotor) manufactured by TA Instruments Inc.
- An oil-based ballpoint pen ink 24 having an ink viscosity of 2000 mPa ⁇ s (25 ° C.) at a shear rate of 500 sec ⁇ 1 and a grease-like ink follower 25 are accommodated.
- a coil spring 23 is disposed behind the ball 9, and the ball 9 is pressed against the seal surface 2b side of the tip end portion 2a by this pressing force.
- the pressing force of the coil spring 23 that presses the ball 9 was 10 gf, and the ball holding force was 450 gf.
- the ballpoint pen ink 24 in the ink containing cylinder 22 is supplied from the rear hole 8 of the ballpoint pen tip 1 to the ball 9 through the ink circulation hole 7 and the ink circulation groove 6.
- the ball-point pen ink 24 supplied to the ball 9 passes through a gap generated between the inner wall of the tip end 2a and the ball 9 when the ball 9 moves toward the contact surface 5 by the clearance by the writing pressure. , Will be discharged. As a result, writing is made.
- the ballpoint pen ink 24 When the ball 9 is rotated by writing, the ballpoint pen ink 24 is dragged from the ink circulation hole 7 into the first gap S1, and the ballpoint pen ink 24 is interposed between the ball 9 and the contact surface 5. Layers are formed. Pressure is generated by the ink layer, and a force to float the ball 9 is generated (wedge effect). Thereby, the wear of the contact surface 5 is suppressed.
- the ballpoint pen ink 24 that could not protrude onto the paper surface is returned from the ball holding chamber 3 to the contact surface 5.
- an ink layer is also formed in the second gap S2, and thus synergistically with the effect of the ink layer in the first gap S1, The writing feeling and wear resistance can be improved.
- the ink viscosity of the ballpoint pen ink 24 is not particularly limited. However, when the viscosity at the time of writing is less than 10 mPa ⁇ s, the ink viscosity is too low, and the distance between the ball and the contact surface is low. It tends to be difficult to obtain fluid lubrication or mixed lubrication. On the other hand, when the ink viscosity exceeds 5,000 mPa ⁇ s, the ball rotation resistance at the time of writing becomes too large, and the writing feeling tends to be heavy. Therefore, the ink viscosity at the time of writing is preferably 10 to 5,000 mPa ⁇ s, more preferably 30 to 3,000 mPa ⁇ s, and most preferably 50 to 2,500 mPa ⁇ s.
- the curved contact surface 5 having a larger radius of curvature (smaller curvature) than that of the ball 9 is obtained by inclining the bottom wall at the time of caulking after using the springback property by the hammer ring.
- the method of forming the contact surface 5 is not particularly limited as long as the curved contact surface 5 having the first gap S1 and the second gap S2 is obtained.
- the caulking angle ⁇ , the ball diameter, the ball protrusion and the like of the ballpoint pen tip 1 are not particularly limited.
- the angle ⁇ of the bottom wall 4 is smaller than 90 degrees, it is difficult to form the second gap S2 on the contact surface 5, and if the angle ⁇ of the bottom wall 4 exceeds 150 degrees, the first gap S1 is formed. It is hard to do.
- the angle ⁇ of the bottom wall 4 is preferably 90 degrees or more and 150 degrees or less, and most preferably 100 degrees to 140 degrees.
- a ball-point pen tip 31 according to the third embodiment shown in FIGS. 9 to 12 includes a ball holding chamber 33 for holding the ball 9 and an ink formed at the center of the bottom wall 34 of the ball holding chamber 33.
- the tip end portion 32a of the tip body 32 having the circulation holes 37 and a plurality (four in this example) of ink circulation grooves 36 extending radially from the ink circulation holes 37 is caulked inward to thereby hold the ball.
- the ball-point pen tip 31 is configured to project a part of the ball 9 held in the holding chamber 33 from the tip end edge of the tip and rotatably hold the ball 9.
- the chip body 32 is made of a stainless steel wire. Further, the ink circulation hole 37 is continuous with the chip rear hole 38.
- the ball 9 has a diameter of 0.5 mm and is made of tungsten carbide.
- the bottom wall 34 of the ball holding chamber 33 is provided with a curved contact surface 35 having a curvature different from the curvature of the ball 9, and the ball 9 is a part of the contact surface 35. It abuts against a certain abutting portion 35a.
- a first gap S1 that gradually decreases from the ink circulation hole 37 side is formed between the ball 9 and the contact surface 35, from the ink circulation hole 37 side to the contact portion 35a, and the ink.
- a second gap S2 that gradually decreases from the front end side of the ink flow groove 36 is formed from the front end side of the flow groove 36 to the contact portion.
- a lubricating coating layer V composed of a surface layer portion of diamond-like carbon (DLC) is provided on the surface of the contact surface 35. Further, a lubricating coating layer V composed of a surface layer portion of diamond-like carbon (DLC) is also provided on a seal surface 32b described later.
- Such a ball-point pen tip 31 is manufactured as follows. That is, for example, a stainless steel wire having a diameter of 2.3 mm and a hardness of 230 Hv to 280 Hv is cut to a desired length, and the ball holding chamber 33, the ink circulation hole 37, and the ink circulation groove extending radially from the ink circulation hole 37 36 are produced. Thereafter, diamond-like carbon (DLC) is formed in a region on the side where the ball 9 is placed, at least a portion scheduled to be the contact surface 35 and a portion scheduled to be the seal surface 32b. A lubricating coating layer V composed of a surface layer portion is provided.
- DLC diamond-like carbon
- a curved surface having a larger radius of curvature than the ball 9 is formed by the springback property.
- the tip end portion 32a is caulked inward.
- a curved contact surface 35 having a curvature different from that of the ball 9 is formed, and the ball 9 is on the peripheral line around the axis on the tip end portion 32a side of the center position of the contact surface 35 in the axial direction. It contacts at the contact portion 35a.
- a first gap S1 and a second gap S2 are formed between the ball 9 and the contact surface 35.
- the first gap S1 and the second gap S2 are formed, fluid lubrication or mixed lubrication is performed between the ball 9 and the contact surface 35 (contact portion 35a). Easy to maintain. For this reason, the wear of the contact surface (contact portion) is suppressed. Further, in the present embodiment, since the lubricating coating layer V composed of the surface layer portion of diamond-like carbon (DLC) is provided on the surface of the contact surface 35 and the sealing surface 32b, the wear suppressing effect is further enhanced.
- DLC diamond-like carbon
- the ball protruding from the tip end edge of the ball 9 is 20% of the ball diameter
- the caulking angle ⁇ is 90 degrees
- the vertical clearance (movable distance) of the ball 9 is Is 15 ⁇ m
- the inclination angle ⁇ of the bottom wall 34 is 135 degrees (see FIG. 10).
- the opening length H in the axial direction of the first gap S1 on the ink circulation hole 37 side is 0.9 ⁇ m (see FIG. 12).
- a curved seal surface 32b is formed on the inner wall of the tip end portion 32a.
- the leading edge of the abutting surface 35 in the longitudinal section of FIG. 10 and the leading edge of the seal surface 32b facing each other across the abutting surface 35 and the axis J see FIG. 9).
- the intersection K of the line segments K1, K2 passes through the approximate center C of the ball.
- the bias of the ball 9 is suppressed and the ball 9 is unlikely to come off from the contact surface 35.
- the rotation of the ball 9 is smooth, the gap between the ball 9 and the seal surface 32b is easily maintained, and therefore, a stable ink outflow amount can be realized and the ink can be easily returned. Can play.
- uneven wear of the contact portion 35a and the seal surface 32b due to the rotation of the ball 9 can be suppressed.
- the ballpoint pen tip 41 of the fourth embodiment shown in FIGS. 13 to 15 is also formed in the center of the ball holding chamber 43 for holding the ball 9 and the bottom wall 44 of the ball holding chamber 43.
- the tip end portion 42a of the tip body 42 having the formed ink circulation holes 47 and a plurality of (four in this example) ink circulation grooves 46 extending radially from the ink circulation holes 47 inward.
- the chip body 42 is also made of a stainless steel wire.
- the ink circulation hole 47 is also continuous with the chip rear hole 48.
- the ball 9 has a diameter of 0.5 mm and is made of tungsten carbide.
- the bottom wall 44 of the ball holding chamber 43 is provided with a curved contact surface 45 having a curvature different from the curvature of the ball 9, and the ball 9 is a part of the contact surface 45. It comes to contact
- the four positions at the substantially center in the circumferential direction of the contact surface 45 in the region between the ink circulation grooves 46 are formed high, so that the four positions in the circumferential direction of the contact surface 45 are
- the balls 9 are in contact with each other in a substantially dotted manner. That is, these four places serve as contact portions 45a.
- a first gap S1 that gradually decreases from the ink circulation hole 47 side is formed between the ball 9 and the contact surface 45 from the ink circulation hole 47 side to the contact portion.
- a second gap S2 that gradually decreases from the front end side of the ink distribution groove 46 is formed from the front end side of the ink distribution groove 46 to the contact portion.
- a third gap S3 between the ball 9 and the contact surface 45 is exposed in the vicinity of the joint portions T1 and T2 between the contact surface 45 and the ink circulation groove 46. .
- Such a ballpoint pen tip 41 is manufactured as follows. That is, for example, a stainless steel wire having a diameter of 2.3 mm and a hardness of 230 Hv to 280 Hv is cut to a desired length, and the ball holding chamber 43, the ink circulation hole 47, and the ink circulation groove extending radially from the ink circulation hole 47. 46 are produced. Thereafter, hammering is performed from the tip end portion 42a side while a molding hammering ball different from the ball 9 is placed on the bottom wall 44 of the ball holding chamber 43, and the radius of curvature is increased by the spring back property. A curved surface is formed in which the four portions serving as the contact portions 45a are raised in the large overall curved surface.
- the hammering ball is replaced with the regular ball 9, and the tip end portion 42a is caulked inward.
- the contact surface 45a as described above is formed, and the first gap S1, the second gap S2, and the third gap S3 are formed between the ball 9 and the contact surface 45.
- the first gap S1, the second gap S2, and the third gap S3 are formed, so that the fluid between the ball 9 and the contact surface 45 (contact portion 45a) is fluid. Easy to maintain lubrication or mixed lubrication. For this reason, the wear of the contact surface (contact portion) is suppressed. Further, in the present embodiment, since the lubricating coating layer V composed of the surface layer portion of diamond-like carbon (DLC) is provided on the surface of the contact surface 45 and the sealing surface 42b, the wear suppressing effect is further enhanced.
- DLC diamond-like carbon
- the contact portion 45a is located away from the ink circulation groove 46, even if the contact portion 45a is worn, the influence on the function of the ink circulation groove 46 is small. For this reason, it is possible to maintain a stable ink flow.
- FIG. 16 shows an example in which the ball-point pen tip 31 of the third embodiment is incorporated in the ball-point pen refill 51.
- the ball-point pen tip 31 of the third embodiment is attached to the tip of the ink containing cylinder 52.
- the ink containing cylinder 52 contains a pigment having an average particle diameter of 0.5 ⁇ m, and is measured at 20 ° C. measured by AR-G2 (stainless steel 40 mm 2 ° rotor) manufactured by TA Instruments Inc.
- An oil-based ballpoint pen ink 54 having an ink viscosity of 2000 mPa ⁇ s (25 ° C.) at a shear rate of 500 sec ⁇ 1 and a grease-like ink follower 55 are accommodated.
- a coil spring 53 is disposed behind the ball 9, and the ball 9 is pressed against the seal surface 32b side of the tip end portion 32a by this pressing force.
- the pressing force of the coil spring 53 that presses the ball 9 was 10 gf, and the ball holding force was 450 gf.
- the ballpoint pen ink 54 in the ink containing cylinder 52 is supplied from the rear hole 38 of the ballpoint pen tip 1 to the ball 9 through the ink circulation hole 37 and the ink circulation groove 36.
- the ball-point pen ink 54 supplied to the ball 9 passes through a gap generated between the inner wall of the tip end portion 32a and the ball 9 when the ball 9 moves toward the contact surface 35 by the clearance by the writing pressure. , Will be discharged. As a result, writing is made.
- the ballpoint pen ink 54 When the ball 9 is rotated by writing, the ballpoint pen ink 54 is dragged from the ink circulation hole 37 into the first gap S1, and the ballpoint pen ink 54 is interposed between the ball 9 and the contact surface 35. Layers are formed. Pressure is generated by this ink layer, and a force to float the ball 9 is generated (wedge effect). As a result, wear of the bottom wall 34 is suppressed.
- the ballpoint pen ink 54 that could not protrude onto the paper surface is returned from the ball holding chamber 33 to the contact surface 35.
- the second gap S2 since the second gap S2 is formed, an ink layer is also formed in the second gap S2, and thus synergistically with the effect of the ink layer in the first gap S1, The writing feeling and wear resistance can be improved.
- the ink viscosity of the ballpoint pen ink 54 is not particularly limited. However, when the viscosity at the time of writing is less than 10 mPa ⁇ s, the ink viscosity is too low, and the distance between the ball and the contact surface is low. It tends to be difficult to obtain fluid lubrication or mixed lubrication. On the other hand, when the ink viscosity exceeds 5,000 mPa ⁇ s, the ball rotation resistance at the time of writing becomes too large, and the writing feeling tends to be heavy. Therefore, the ink viscosity at the time of writing is preferably 10 to 5,000 mPa ⁇ s, more preferably 30 to 3,000 mPa ⁇ s, and most preferably 50 to 2,500 mPa ⁇ s.
- a curved contact surface 5 having a larger radius of curvature (smaller curvature) than that of the ball 9 is formed by performing caulking after using the springback property by the hammer ring.
- the method for forming the contact surface 5 is not particularly limited as long as the curved contact surface 5 having the first gap S1 and the second gap S2 is obtained.
- the caulking angle ⁇ , the ball diameter, the ball protrusion, etc. of the ballpoint pen tip 31 are not particularly limited. However, if the angle ⁇ of the bottom wall 34 is smaller than 90 degrees, it is difficult to form the second gap S2 on the contact surface 35. If the angle ⁇ of the bottom wall 34 exceeds 150 degrees, the first gap S1 is formed. It is hard to do. For this reason, the angle ⁇ of the bottom wall 34 is preferably 90 degrees or more and 150 degrees or less, and most preferably 100 degrees to 140 degrees.
Landscapes
- Pens And Brushes (AREA)
- Inks, Pencil-Leads, Or Crayons (AREA)
Abstract
Description
本件発明者による回転するボールとボール座との関係についての分析によれば、ボールとボール座との間にボールペン用インキが入り込むことで形成される流体潤滑、ボールとボール座の当接面とが直接に接触する境界潤滑、流体潤滑と境界潤滑とが混じり合った混合潤滑、のそれぞれの状態がある。
図1から図4に示す第1の実施形態のボールペンチップ1は、ボール9を抱持するためのボール抱持室3と、当該ボール抱持室3の底壁4の中央に形成されたインキ流通孔7と、当該インキ流通孔7から放射状に延びる複数本(本例では4本)のインキ流通溝6と、を有するチップ本体2のチップ先端部2aを内側にかしめることにより、ボール抱持室3内に抱持されるボール9の一部をチップ先端縁より突出させると共に当該ボール9を回転自在に抱持するボールペンチップ1である。
次に、図5から図7に示す第2の実施形態のボールペンチップ11も、ボール9を抱持するためのボール抱持室13と、当該ボール抱持室13の底壁14の中央に形成されたインキ流通孔17と、当該インキ流通孔17から放射状に延びる複数本(本例では4本)のインキ流通溝16と、を有するチップ本体12のチップ先端部12aを内側にかしめることにより、ボール抱持室13内に抱持されるボール9の一部をチップ先端縁より突出させると共に当該ボール9を回転自在に抱持するボールペンチップ11である。
次に、図8に示すのは、第1の実施形態のボールペンチップ1をボールペンレフィル21に組み込んだ例である。具体的には、インキ収容筒22の先端部に、第1の実施形態のボールペンチップ1が装着されている。インキ収容筒22内には、平均粒径が0.5μmの顔料を含有し、ティー・エイ・インスツルメント株式会社製AR-G2(ステンレス製40mm2° ローター)によって測定される、20℃、剪断速度500sec-1におけるインキ粘度が2000mPa・s(25℃)である油性ボールペン用インキ24と、グリース状のインキ追従体25と、が収容されている。
図9から図12に示す第3の実施形態のボールペンチップ31は、ボール9を抱持するためのボール抱持室33と、当該ボール抱持室33の底壁34の中央に形成されたインキ流通孔37と、当該インキ流通孔37から放射状に延びる複数本(本例では4本)のインキ流通溝36と、を有するチップ本体32のチップ先端部32aを内側にかしめることにより、ボール抱持室33内に抱持されるボール9の一部をチップ先端縁より突出させると共に当該ボール9を回転自在に抱持するボールペンチップ31である。
次に、図13から図15に示す第4の実施形態のボールペンチップ41も、ボール9を抱持するためのボール抱持室43と、当該ボール抱持室43の底壁44の中央に形成されたインキ流通孔47と、当該インキ流通孔47から放射状に延びる複数本(本例では4本)のインキ流通溝46と、を有するチップ本体42のチップ先端部42aを内側にかしめることにより、ボール抱持室43内に抱持されるボール9の一部をチップ先端縁より突出させると共に当該ボール9を回転自在に抱持するボールペンチップ41である。
次に、図16に示すのは、第3の実施形態のボールペンチップ31をボールペンレフィル51に組み込んだ例である。具体的には、インキ収容筒52の先端部に、第3の実施形態のボールペンチップ31が装着されている。インキ収容筒52内には、平均粒径が0.5μmの顔料を含有し、ティー・エイ・インスツルメント株式会社製AR-G2(ステンレス製40mm2° ローター)によって測定される、20℃、剪断速度500sec-1におけるインキ粘度が2000mPa・s(25℃)である油性ボールペン用インキ54と、グリース状のインキ追従体55と、が収容されている。
2、12、32、42 チップ本体
2a、12a、32a、42a 先端部
2b、12b、32a、42a シール面
3、13、33、43 ボール抱持室
4、14、34、44 底壁
5、15、35、45 当接面
5a、15a、35a、45a 当接部
6、16、36、46 インキ流通溝
7、17、37、47 インキ流通孔
8、18、38、48 後部孔
9 ボール
21、51 ボールペンレフィル
22、52 インキ収容筒
23、53 コイルスプリング
24、54 ボールペン用インキ
25、55 インキ追従体
S1、S2、S3 隙間
T1、T2 接合部
α かしめ角度
β 底壁の角度
H 隙間の長さ
V 潤滑被膜層
Claims (10)
- ボールを抱持するためのボール抱持室と、当該ボール抱持室の底壁の中央に形成されたインキ流通孔と、当該インキ流通孔から放射状に延びる複数本のインキ流通溝と、を有するチップ本体のチップ先端部を内側にかしめることにより、ボール抱持室内に抱持されるボールの一部をチップ先端縁より突出させると共に当該ボールを回転自在に抱持するボールペンチップにおいて、
前記ボール抱持室の底壁には、前記ボールの曲率とは異なる曲率の曲面状の当接面が設けられており、前記ボールは当該当接面の一部である当接部に対して当接するようになっており、
前記ボールと前記当接面との間に、インキ流通孔側から前記当接部までインキ流通孔側から除々に小さくなる第1の隙間が形成されていると共に、インキ流通溝の先端側から前記当接部までインキ流通溝の先端側から除々に小さくなる第2の隙間が形成されている
ことを特徴とするボールペンチップ。 - 前記当接部は、前記当接面の軸心方向の中央位置よりもチップ先端部側に位置している
ことを特徴とする請求項1に記載のボールペンチップ。 - 前記当接面は、軸心に対して軸対称であり、
前記当接部は、前記当接面の周方向に周回するように位置している
とを特徴とする請求項1または2に記載のボールペンチップ。 - 前記当接部は、前記当接面の周方向に略均等に位置している
とを特徴とする請求項1または2に記載のボールペンチップ。 - 請求項1乃至4のいずれかに記載のボールペンチップが、インキ収容筒の先端に直接またはチップホルダーを介して装着され、当該インキ収容筒内にボールペン用インキが収容されてなるボールペンレフィルであって、
前記ボールペン用インキは、少なくとも微粒子を含有しており、
前記微粒子の大きさは、軸心方向における前記インキ流通孔側の開口の長さよりも小さい
ことを特徴とするボールペンレフィル。 - 前記ボールの表面、及び/又は、前記当接面の表面に、潤滑被膜層が設けられている
ことを特徴とする請求項1に記載のボールペンチップ。 - 前記当接部は、前記当接面の軸心方向の中央位置よりもチップ先端部側に位置している
ことを特徴とする請求項6に記載のボールペンチップ。 - 前記当接面は、軸心に対して軸対称であり、
前記当接部は、前記当接面の周方向に周回するように位置している
とを特徴とする請求項6または7に記載のボールペンチップ。 - 前記当接部は、前記当接面の周方向に略均等に位置している
とを特徴とする請求項6または7に記載のボールペンチップ。 - 請求項6乃至9のいずれかに記載のボールペンチップが、インキ収容筒の先端に直接またはチップホルダーを介して装着され、当該インキ収容筒内にボールペン用インキが収容されてなるボールペンレフィルであって、
前記ボールペン用インキは、少なくとも微粒子を含有しており、
前記微粒子の大きさは、軸心方向における前記インキ流通孔側の開口の長さよりも小さい
ことを特徴とするボールペンレフィル。
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US13/976,870 US9346313B2 (en) | 2010-12-27 | 2011-12-27 | Ballpoint pen tip and ballpoint pen using the same |
JP2012550995A JP5807019B2 (ja) | 2010-12-27 | 2011-12-27 | ボールペンチップ及びそれを用いたボールペン |
CN201180062898.XA CN103328227B (zh) | 2010-12-27 | 2011-12-27 | 圆珠笔笔尖以及使用该圆珠笔笔尖的圆珠笔 |
EP11852860.3A EP2660071B1 (en) | 2010-12-27 | 2011-12-27 | Ball pen tip and ball pen using same |
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US11596795B2 (en) | 2017-07-31 | 2023-03-07 | Medtronic, Inc. | Therapeutic electrical stimulation therapy for patient gait freeze |
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CN104527262A (zh) * | 2014-12-18 | 2015-04-22 | 无锡伊诺永利文化创意有限公司 | 圆珠笔芯球珠装置 |
KR102523342B1 (ko) * | 2015-12-29 | 2023-04-20 | 가부시키가이샤 파이롯트 코포레이숀 | 열변색성 필적을 형성시키기 위한 필기구 |
JP7113488B2 (ja) * | 2018-02-22 | 2022-08-05 | 株式会社トンボ鉛筆 | ボールペンチップ及びボールペン |
JP7357461B2 (ja) * | 2018-08-23 | 2023-10-06 | 三菱鉛筆株式会社 | ボールペンリフィル及びボールペン |
CN116457216B (zh) * | 2020-11-16 | 2023-12-05 | 株式会社百乐 | 圆珠笔笔尖、圆珠笔笔芯和圆珠笔 |
WO2024056217A1 (en) * | 2022-09-12 | 2024-03-21 | Societe Bic | Pen tip |
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US9346313B2 (en) | 2016-05-24 |
US20140147190A1 (en) | 2014-05-29 |
EP2660071A4 (en) | 2014-05-21 |
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