JP2001171286A - Knocking type writing utensil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a knocking type writing utensil using a ball-point pen wherein an ink being apt to disconnect in the initial writing is used, mainly, a ball-point pen for the correction of wrong writing, for which the stirring is not required, and the troublesomeness to press the side surface of a container is eliminated, is used. SOLUTION: For a ball-point pen refill 5, a pumping type pressurizing mechanism section is provided at the rear end of an ink-housing tube 10, and in addition, a valve mechanism is arranged in a manner to locate at the rear end of a follower which is disposed in a manner to be located in front of the pressurizing mechanism section, be in contact with the rear end of an ink, and follow the consumption of the ink. Then, this knocking type writing utensil loads the ball-point pen refill, and can engage the tip end section 7 under the protruding and sunk states respectively from the tip end. In such a knocking type writing utensil, under the state wherein the tip end section is projected, the pressurizing mechanism section is advance-operated by the knocking motion of a knocking cylinder 3 provided in a manner to protrude from the rear end, and thus, air is pushed into the rear end hole of the ink-housing tube. In this case, the valve is opened by a specified pressure, and the rear end of the follower is pressurized, and thus, the flowability of the ink to the tip side becomes supportable.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a knock pen having a refill such as a ballpoint pen using an ink which easily runs out of ink during initial writing, and a ballpoint pen or the like which mainly corrects errors by hiding white ink. About.

[0002]

2. Description of the Related Art Conventionally, there has been known a liquid applicator using a white pigment in order to correct a mistake or the like. In addition, since a white pigment and a solvent are easily separated from each other, this type of liquid applicator has a flexible container in which ink, balls, and the like are sealed, and it is necessary to shake and agitate the liquid applicator before use. Further, the ink is ejected by pressing the side surface of the container. However, when the remaining amount of the ink becomes small, even if the side wall of the container is strongly pushed, the ink is not ejected. Also, initial writing (application)
There is a problem that the ink tends to break off. In addition, there is the trouble of attaching and detaching the cap each time it is used.

In general, a ballpoint pen using low-viscosity ink or ink having shear thinning has a large amount of ink flowing out (in order to increase the writing density) and has a large diameter of the ink storage tube to increase the amount of loaded ink. are doing. Further, since the viscosity of the ink is smaller than that of the oil-based ball-point pen, the flow resistance to the ink container is small. Accordingly, ink leakage (ink flows backward at the rear end of the ink storage tube) is likely to occur due to the ink's own weight, falling or knocking impact. For this reason, the ink usually moves following the ink consumption at the time of writing at the rear end of the ink, but a grease-like follower that suppresses the backflow of the ink due to its own weight or impact, and if necessary, a follower A rod is provided immersed in the follower. However, even when the follower is provided, if the ink on the back surface of the ball of the chip runs out when writing upward, there is a risk that a remarkable backflow occurs because the ink head is added directly and the hands and clothes are stained. Further, since the viscosity of the ink is low and the amount of outflow is large, there is a problem that the ink is bleeding (direct current) when a gap is formed between the tip ball and the tip holding portion when the tip side is directed downward.

[0004]

SUMMARY OF THE INVENTION The present invention relates to a knock pen equipped with a refill such as a ballpoint pen which uses ink that is easily peeled off at the time of initial writing, and a ballpoint pen or the like which mainly corrects errors by hiding white ink. It is an object of the present invention to provide a ballpoint pen for correcting a clerical error such as a writing pen which does not need to be mainly stirred and which does not bother pressing the side of the container.

[0005]

The present invention has the following arrangement to achieve the above object. The knock-type writing instrument according to the first aspect of the present invention is provided with a tip of a ballpoint pen at the tip and an ink storage tube at the rear, and is provided on the back of the tip ball so that the tip ball is in close contact with the inner edge of the ball holding portion at the tip. A spring pressure is applied, the ink container is filled with ink and a follower that follows the ink at the rear end of the ink, and a pumping type pressurizing mechanism is provided at the rear end of the ink container. A ballpoint pen refill having a valve mechanism disposed at a rear end of a follower disposed so as to contact the rear end of the ink and follow the consumption of the ink, and a tip mounted on the ballpoint refill with the ballpoint pen refill. In the knock-type writing instrument that can lock the tip in the retracted state, the knock tip of the knock cylinder provided with the tip tip protruding from the rear end The pressure mechanism is moved forward to push air into the rear end hole of the ink storage tube. At this time, the valve is opened at a predetermined pressure and the rear end of the follower is pressurized. It is configured to support liquidity to the side.

According to a second aspect of the present invention, there is provided a knock-type writing instrument as set forth in the first aspect, wherein the pressurizing mechanism is configured to store ink through a knock spring at a rear end of the ink storing pipe. A knock bar locked in a state capable of moving back and forth with respect to the tube, and the inside of the ink storage tube is communicated with the outside air immediately before the knock bar is advanced, and the rear portion of the ink storage tube is shut off from the outside air immediately after the knock bar is appropriately advanced. The valve mechanism is pressed by a spring so that the valve element is in close contact with the receiving seat, and when the knock bar is further advanced and the rear portion in the ink storage tube is pressurized, The valve body is configured to open at a predetermined pressure to press the rear end of the follower.

According to a third aspect of the present invention, there is provided the knock-type writing instrument according to the first aspect, wherein the ink-containing tube is provided with at least a white pigment such as titanium oxide or polymer hollow fine particles and a gel. The ink is filled with a white pigment ink containing an agent and preventing the sedimentation of the pigment and preventing the fluidity from being impaired as much as possible.

[0008]

1 and 2 show a state in which a ballpoint pen refill 5 is mounted on a knock-type writing instrument. The front end and the rear end are opened, and a part of the circumference of the side surface is a required distance from the rear end edge. A shaft cylinder 1 having a long axial window 1d communicating with the front position, and a ball portion 1b elastically displaceable upward and laterally at a position facing the window 1d of the shaft cylinder 1. A locking step 1c is provided on the ball 1b, and a clip 1a having a base 1e joined to the barrel 1 at the rear end is integrally formed of resin, and a U-shaped base having an open front end. A portion surrounded by the slit is formed as an elastic piece 1f at the upper end of 1e, and an inclined surface 1g is appropriately formed at the lower end of the elastic piece 1f.
A front shaft 2 is detachably fixed to the front end of the shaft cylinder 1 by means such as screwing.

On the other hand, as will be described later in detail, the return spring 4 is fitted to the front shaft portion 6a of the ball-point pen refill 5 and inserted into the inside of the barrel 1 from the rear end opening of the barrel 1 to return. The front end of the spring 4 is the inner step 2 of the front shaft 2.
c, and the rear end thereof is in contact with a step 6i in front of the ballpoint refill 5.

[0010] The knock cylinder 3 is a tubular body on the front end opening and the rear end closing, and is provided with a locking projection 3a from the front on the coaxial line of the outer peripheral portion.
The rib 3b and the safety piece 3c are integrally formed.
The knock cylinder 3 has the ball-point pen refill 5 in its inner hole.
Is inserted from the rear end of the barrel 1 in a state where the ink storage section 10 is fitted therein, the locking projections 3a, the ribs 3b, and the safety pieces 3c are fitted into the window holes 1d of the barrel 1, and the safety pieces 3c The elastic piece 1f provided on the base 1e of the clip 1a
Abuts against the stepped portion 1h at the front end of the front end and is locked.

As described above, when the rear end of the knock cylinder 3 is pressed forward, the locking projection 3a pushes up the ball 1b of the clip 1a and moves forward to engage with the locking step 1c. Sometimes, the tip 7 of the ballpoint pen refill 5 protrudes from the distal end hole 2a of the front shaft 2. 2 (see FIG. 2), the tip of the clip 1a is elastically displaced slightly upward or laterally to release the engagement between the locking step 1c and the locking projection 3a, and the return spring 4 secures the ballpoint pen refill 5 by the return spring 4. The dimensions of each part are appropriately set so that the tip 7 of the ballpoint pen refill 5 is immersed inside the front shaft 2 in a state where the piece 3c is retracted until it abuts the step 1h of the elastic piece 1f. In addition, ballpoint pen refill 5
Is replaced by removing the tip shaft 2 from the barrel 1, but in the case of disposable without replacing the ballpoint pen refill 5, the barrel 1 and the tip shaft 2 can be formed integrally.

FIGS. 3 to 5 show the ballpoint pen refill 5 described above. First, as shown in FIG. 3, a white pigment ink 11 is filled in an ink storage tube 10 of a ballpoint pen refill 5, and a grease-like follower 12 that follows the ink as the ink is consumed is filled in the rear end of the ink. I have. In addition, the follower is not compatible with the ink and has a function of preventing the evaporation of the ink. If necessary, a resin follower rod 13 having a specific gravity substantially equal to that of the follower is immersed in the follower. The follower may be a follower such as silicon rubber.

The white pigment ink 11 contains at least a white pigment such as titanium oxide and hollow polymer fine particles and a gelling agent, and is blended so that sedimentation of the pigment is prevented and fluidity is not impaired as much as possible. It is a white pigment ink. or,
Since the ink has a shear thinning property, the ink can be applied with a high concealing property in combination with a decrease in the viscosity as the tip ball rotates.

As shown in the figure, the joint 6 has a front shaft portion 6a formed in front of a flange portion 6b and a rear shaft portion 6c formed in the rear, and a tip ball 8 is formed in a tip fitting hole 6h at the front end of the front shaft portion 6a. The shaft portion 7a of the chip 7 holding the shaft is fixed. The tip 7 is caulked so that the tip ball 8 is rotatably held with the tip ball 8 substantially in contact with a seat having a channel into which ink can flow. The spring 9 is inserted into the inner hole of the chip 7, the rear end of the shaft 7a of the chip is appropriately caulked, and the rear end of the spring 9 cannot be pulled out.

A straight rod portion 9 a is formed in front of the spring 9, and the tip of the rod portion 9 a contacts the back surface of the tip ball 8 in a pressed state. In addition, tip ball 8
Is pressed closely to the inner edge of the ball holding portion (formed by caulking or the like) of the chip 7. In addition, it is possible to provide a pressing member for pressing the back surface of the tip ball 8 on the front surface of the spring, or to make the rod shaft portion into an extremely fine coil shape. Further, it is also possible to form the chip into a resin molded product having excellent wear resistance and ink sealing performance, and to provide a spring seat for pressing the back surface of the tip ball as an integral or separate spring seat. is there.

Further, it is extremely important that the tip ball 8 is in close contact with the inner surface of the ball holding portion, even if the ink has a high viscosity, for drying the writing tip and preventing direct current of the ink. That is,
In order to increase the amount of ink discharged, the ballpoint pen mainly for correcting and writing errors as in the present application is set to have a larger retreat size of the tip ball than the ballpoint pen for writing. Also, if necessary, the surface roughness of the inner surface of the chip holding the tip ball 8, the inner surface is ground to improve the close contact accuracy by caulking, and the secondary plastic working to increase the caulking accuracy is considered. You. Also, if necessary, a surface treatment or the like may be considered on the surface in close contact with the tip ball.

A valve chamber 6d, which is appropriately eccentric with the axis of the chip 7, is provided behind the chip fitting hole 6h.
A tapered or spherical valve element receiving seat 6e is formed at the rear of d so as to communicate with the guide hole 6g. A groove 6f into which ink can flow is formed on one side of the inner wall of the valve chamber 6d. Further, a spherical valve element 6j is loosely fitted in the valve chamber 6d, and the valve element 6j abuts on a state in which the valve element 6j is biased to the rear end of the shaft portion 7a of the chip with the chip 7 facing downward. 6
The ink flowing from the guide hole 6g through the f and the like flows into the chip inner hole. Note that the valve body may be a shaft-like body having a tapered or spherical shape on the side close to the valve body receiving seat. In this case, the valve chamber does not need to be eccentric with respect to the chip axis as described above by forming a groove through which ink flows into the chip on the peripheral surface of the chip in contact with the rear end of the shaft portion of the chip. .

A rear shaft portion 6c extends behind the flange portion 6b of the joint 6, and a cylindrical ink storage tube 10 is provided on the outer periphery of the rear shaft portion 6c with its front end at the rear end of the flange portion 6b. It is pressed and fixed in contact. In addition, a transparent PP resin molded product or the like is used as the ink storage tube 10 as an example. Further, in the embodiment, the joint and the ink storage tube are formed as separate members, but both may be formed as an integral resin molded product.

At the rear end of the ink storage tube 10, a pumping type pressurizing mechanism and a valve mechanism are provided. The configuration will be described below.

First, the valve mechanism will be described. The valve mechanism is disposed at a rear end of a follower disposed so as to contact the rear end of the ink and follow the ink as it is consumed. The bush 14 is provided with a hole at the shaft center from the front end,
A tapered or spherical receiving seat 14c is formed at the rear end of the hole, and a hole having a slightly smaller diameter penetrates to the rear end to form a vent 14d. Also, in the hole at the front end,
A step portion 14b protruding inward at a required position is provided, and a spring 16 is laid between the valve body and the step portion 14b such that the spherical valve body 15 is in close contact with the receiving seat 14c. Incidentally, the step portion 14b of the bush 14 is formed as a piece which is provided with a slit portion 14a or the like so as to be elastically deformable and is easily formed in a stage before being fixed in the ink container 10. The valve body 15 and the spring 16 can be laid.

A pumping type pressurizing mechanism is provided at the rear end of the ink storage tube 10. The configuration of the pressing mechanism will be described below. First, a tapered slit portion 10b tapering from the rear end side toward the front is formed on the rear end side surface of the ink storage tube 10, and a step portion 10c is formed at the front end.
And a slit portion 10a having a predetermined length in the axial front is formed. The knock bar 17 has a flange at the rear end and a shaft in front of the flange, a step 17b at the front end of the flange, and a projection 17a and a substantially outer periphery of the shaft at substantially the middle of the outer periphery of the shaft. A circumferential groove 17c is provided at the front end, and a seal ring 18 made of, for example, an elastic body such as rubber or an elastic molding resin is fixed to the groove 17c. Note that a seal ring having good confidentiality and slipperiness is selected. or,
Consideration is given to interposing other lubricants. Further, the seal ring portion may be formed integrally with the outer periphery of the shaft portion.

The knock bar 17 is inserted from the rear end of the ink container 10, and a knock spring 19 is laid between the step 17 b and the rear end of the ink container 10.
The protrusion 17a elastically expands the tapered slit portion 10b, the protrusion 17a is locked on the front surface of the step portion 10c, and the knock bar 17 is always rearward with respect to the ink storage tube 10 by the knock spring 19. Will be energized. Further, the front portion of the shaft portion of the knock bar is fitted into the rear end hole of the ink storage tube 10, and the outer peripheral portion of the seal ring 18 is in sliding contact with the inner peripheral portion of the rear end hole.
At this time, the seal ring 18 is
Of the shaft cylinder, so that the rear end hole (space portion 20) of the barrel communicates with the outside air. That is, immediately before the forward movement of the knock bar 17, the ink storage tube 1
The rear end hole is communicated with the outside air, and the outer periphery of the seal ring 18 comes into close contact with the inner periphery of the ink storage tube immediately after the knock rod 17 has appropriately advanced, so that the rear end hole is shut off from the outside air. It is configured to be pressurized. Details will be described later in operation.

The ballpoint refill 21 shown in FIG. 5 shows another embodiment of the ballpoint refill. The difference from the above-mentioned ball-point pen refill 5 is that it does not have a valve element provided inside the joint and a follower rod provided inside the follower. That is, the valve element and the follower rod are not essential components. Details will be described later in operation.

[0024]

First, FIG. 1 shows a state in which a knock-type writing instrument is carried. When the rear end of the knock cylinder 3 is pressed forward from this state, the locking projection 3a pushes up the ball portion 1b of the clip 1a and moves forward to engage with the locking step portion 1c. The tip 7 protrudes from the distal end hole 2a of the front shaft 2. (See FIG. 2) In this state, the space 20 substantially at the rear end of the ink storage tube 10 communicates with the outside air through the slit portion 10a, and the setting force of the return spring 4 and the knock spring 19 is balanced as such. ing.

Next, the operation of the pressurizing mechanism and the valve mechanism will be described below. When the rear end of the knock cylinder 3 is pushed forward from the state shown in FIG. 2, the front end 6 k of the joint 6 comes into contact with the step 2 b provided on the front shaft 2 to prevent the forward movement, and the ink storage tube 10 The knock bar 17 starts moving forward. As shown in FIG. 4, when the outer peripheral portion of the seal ring 18 comes into close contact with the entire inner peripheral portion of the ink storage tube 10, the space 20 substantially at the rear end of the ink storage tube is shut off from the outside air and the knock rod 17 is closed. Is further advanced, the outer peripheral portion of the seal ring 18 slides in close contact with the inner peripheral portion of the ink storage tube, and the internal pressure increases as the space portion 20 is reduced. The valve body 15 opens at a predetermined pressure due to the increase of the internal pressure, and the rear end of the follower is pressed by the air being pushed in, thereby supporting the fluidity of the ink to the chip side.

This is because of the effect of preventing the ink from separating from the peripheral surface of the tip ball due to a drop impact, poor ink flowability, and the like, and preventing continuous ink outflow. It becomes the action to do. The space 20
When the pressure is maximally compressed, the internal pressure is set to be appropriately larger than a predetermined pressure at which the valve body 15 opens, and the internal pressure does not increase much more than the predetermined pressure since the pressure leaks from the seal portion. Air is pushed in.

Next, the basic functions of the ballpoint refill 5 will be described. First, in a state where writing is not performed, the tip ball 8 is brought into close contact with the inner edge of the chip holding portion by the pressing of the spring 9, so that the direct current and the backflow of the ink 11 are prevented.
Further, since the tip ball 8 is slightly retracted by the writing pressure, a gap is generated and the ink can flow out, and the ink flows out by the rotation of the tip ball 8 and the writing is performed. By the way, in a state where the tip 7 is directed upward, the valve 6j is in close contact with the valve receiving seat 6e and seals the conducting hole 6g. Therefore, even if the ink on the back surface of the tip ball 8 is exhausted by the upward writing, the ink does not flow backward. Accordingly, when the chip 7 is turned downward, the ink can immediately flow out, and the breakage of the ink is suppressed. By the way, in the structure having no valve element, since the ink head acts in the backward flow direction in upward writing, there is a problem that air is entrapped in the chip and the ink does not immediately follow in downward writing. In addition, there is a problem that air entrainment is gradually accumulated by repeated upward writing.

The follower rod 13 is used when the ink container has a large diameter. That is, the grease-like follower 12 has a problem in that when the ink storage portion has a large diameter, the grease-like follower 12 is easily deformed and broken by the influence of impact or the like. The rigidity can be increased by immersing a resin follower rod having a specific gravity substantially equal to that of the follower in the follower.

Further, since the tip ball 8 is always in close contact with the inner edge of the ball holding portion, it is possible to prevent handwriting by drying of the tip portion. In addition, even if upward writing or impact is applied by the cooperative action of the tip ball 8 and the valve body 6j, the entrainment of air is reduced, so that breakage of the ink is prevented. The direct current and the reverse flow of the ink are achieved by the pressing of the tip ball 8 by the spring 9. However, the incomplete contact state with the tip ball 8 due to the processing variation of the ball holding portion, the ball holding portion and the tip ball 8 In order to supplement the incomplete state when solid matter adheres to the gap of the ink, it works together to support the large head of the ink to reliably prevent the backflow of the ink and to reduce the air entrapment.

The above-described ink backflow prevention structure having a follower rod and a valve element exhibits performance when the ink storage section is large in diameter and easily backflows, or when repeated upward writing or impact is applied. However, it is not essential as a component, and in particular, a ballpoint pen for correcting erroneous writing is not necessarily used because it is rarely used upward.

When carrying the knock-type writing instrument again, the distal end of the clip 1a is elastically displaced slightly upward or laterally to release the engagement between the locking step 1c and the locking projection 3a. The ball-point pen refill 5 is retracted by the spring 4, and the tip 7 enters the inside of the front shaft 2.

[0032]

The configuration and operation of the knock-type writing instrument according to the present invention are as described above, and a ballpoint pen using ink that is easy to run out of ink in initial writing can be written with the aid of a pressurizing action. Further, a white pigment ink containing at least a white pigment such as titanium oxide and polymer hollow fine particles and a gelling agent, and formulated so that sedimentation of the pigment is prevented and fluidity is not impaired, and a pressure mechanism by pumping By providing the above, there is no problem that the white pigment and the solvent are separated as in the related art, so that there is no need to agitate the ink, there is no need to press the side of the container during writing, and a more troublesome cap It is possible to provide an easy-to-use knock-type writing instrument that has no detachment and is easy to use.

[Brief description of the drawings]

FIG. 1 is a partially non-sectional longitudinal sectional view showing the entirety of a knock-type writing instrument of the present invention, in which a writing tip is immersed.

FIG. 2 is a partially non-sectional longitudinal sectional view in a state where a writing tip is knocked out and a writing tip is projected.

FIG. 3 is a longitudinal sectional view of a ballpoint pen refill as an example.

FIG. 4 is an enlarged cross-sectional view showing an operating state of a pressurizing mechanism and a valve mechanism, which is the gist of the present invention.

FIG. 5 is a longitudinal sectional view showing another embodiment of the ballpoint pen refill.

[Explanation of symbols]

 1 Shaft barrel 1a Clip 1b Ball 1c Locking step 1d Window 1e Base 1f Elastic piece 1g Inclined surface 1h Step 2 Front shaft 2a Tip hole 2b Step 2c Inner step 3 Knock cylinder 3a Locking protrusion 3b Rib 3c Safety piece 4 Return spring 5 Ball pen refill 6 Joint 6a Front shaft 6b Flange 6c Rear shaft 6d Valve chamber 6e Valve body receiving seat 6f Groove 6g Guide hole 6h Chip fitting hole 6i Step 6j Valve body 6k Front end 7 Chip 8 Tip ball 9 Spring 9a Rod shaft 10 Ink storage tube 10a Slit 10b Tapered slit 10c Step 11 Ink 12 Follower 13 Follower rod 14 Bush 14a Slit 14b Step 14c Receiving seat 14d Vent port 15 Valve body 16 Spring 17 Knock bar 17a Projection 17b Step 17c Groove 18 Seal ring 19 Knock spring 20 Space 21 Ballpoint pen refill

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Seiichi Kobayashi 2-5-12 Irie, Kanagawa-ku, Yokohama-shi, Kanagawa Prefecture Mitsubishi Pencil Co., Ltd. Yokohama Office F-term (reference) 2C350 GA03 HA11 KC16 KD01 KD03 KD09 KD10 KD10 NA00 NA10 NA18 NA21 2C353 HA01 HA09 HC04 HC16 HC17 HG03 HL01

Claims (3)

[Claims] 1. A tip of a ball-point pen and an ink storage tube at a rear end thereof, and a spring pressure is applied to a back surface of the tip ball so that the tip ball comes into close contact with an inner edge of a ball holding portion at a tip end of the ball. The ink and the trailing end of the ink are filled with a follower that follows the ink, and a pumping type pressurizing mechanism is provided at the rear end of the ink storage tube. A ballpoint pen refill with a valve mechanism located at the rear end of the follower that is arranged to follow with the consumption of ink, and the ball tip refill is mounted and the tip end of the tip is locked in a protruding state from the tip In the knock-type writing instrument that can be used, with the tip of the tip protruding, the pressing mechanism is advanced by the knocking operation of the knock cylinder provided by protruding from the rear end. The air is pushed into the rear end hole of the ink storage tube, and at this time, the valve is opened at a predetermined pressure and the rear end of the follower is pressurized, so that the fluidity of the ink to the tip side is supported. Knock-type writing utensil characterized by being done. 2. A press mechanism, comprising: a knock bar fixed to a rear end of an ink storage tube via a knock spring so as to be capable of moving back and forth with respect to the ink storage tube; The inside of the ink storage tube is communicated with the outside air at
Immediately after advancing as appropriate, a seal portion is provided so that the rear portion inside the ink storage tube is shut off from the outside air, and the valve mechanism is pressed by a spring so that the valve body is in close contact with the receiving seat. 2. The knock-type writing instrument according to claim 1, wherein the valve body is opened at a predetermined pressure and the rear end of the follower is pressed when the rear portion of the ink storage tube is pressed forward. 3. An ink container containing at least a white pigment such as titanium oxide and hollow polymer fine particles and a gelling agent,
The knock-type writing implement according to claim 1, which is filled with a white pigment ink formulated so as to prevent sedimentation of the pigment and to minimize the loss of fluidity.