JP2001171287A - 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, a tip of a ball-point pen is provided at the tip end, and an ink-housing tube is provided at the rear side. Then, a spring pressure is imparted to the back surface of the tip end ball so that the tip end ball may be closely joined to the internal edge of a ball-embracing section at the tip end of the tip. Also, ink is filled in the ink-housing tube, and at the rear end of the ink, a follower which follows the ink is filled. In addition, at the rear end of the ink-housing tube, a pumping type pressurizing mechanism section is provided. This knocking type writing utensil loads the ball-point pen refill, and can engage the tip end section of the tip under protruding and sunk states respectively from the tip end. In such a knocking type writing utensil, under the state wherein the tip end section of the tip is projected, the pressurizing mechanism section is advance-operated by the knocking motion of the rear end of a knocking cylinder provided in a manner to protrude from the rear end. Thus, air is pushed into the rear end hole of the ink-housing tube, and the rear end of the follower is pressurized, and 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 ballpoint pen refill in which 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 further provided at the rear end of the ink container. In a knock-type writing instrument equipped with the ballpoint pen refill and capable of locking the tip of the tip from the tip in a protruding state, the tip of the tip is protruded and provided from the rear end. By the knocking operation of the knock cylinder, the pressurizing mechanism is moved forward, air is pushed into the rear end hole of the ink storage tube, the rear end of the follower is pressurized, and ink flows to the tip side. Sex is configured to be assisted.

According to a second aspect of the present invention, there is provided a knock-type writing instrument according to the first aspect, wherein the pressure mechanism comprises a spring at a rear end of the ink-receiving pipe via a spring. The pressing cylinder locked in a state in which the pressing cylinder can be moved back and forth, and the inside of the pressing cylinder is communicated with the outside air immediately before the pressing cylinder is moved forward, and the rear portion of the pressing cylinder is shut off from the outside air immediately after the pressing cylinder is appropriately advanced. And a valve body provided to open the valve at a predetermined pressure and press the rear end of the follower when the pressing cylinder is further advanced and the inside of the pressing cylinder is pressurized. It becomes.

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. (However,
It is necessary to provide a separate cylinder for constituting a pressure mechanism described later. )

At the rear end of the ink containing tube 10, a pumping type pressurizing mechanism is provided. The configuration of the pressing mechanism will be described below. First, a slightly thin cylindrical portion 10b is formed at the rear end of the ink storage tube 10, and a step 10c is formed at the front end of the outer peripheral portion of the cylindrical portion 10b, and a contact step 10e is formed at the rear of the outer peripheral portion.
Are formed, and a step 10d is formed at the front end of the inner peripheral portion. The tail plug 14 has a shaft portion at the front and an umbrella-shaped flange 14a at the rear end, and a groove 14 at a required position on the front surface of the flange.
c is formed, and a tapered or spherical receiving seat 14d is formed at the front end of the shaft center portion, and a hole having a slightly smaller diameter penetrates to the rear end at the rear thereof to form a ventilation port 14e. ing.

On the other hand, the pressing cylinder 17 is a cylindrical body whose rear end is closed, and has a stepped portion 17b formed substantially in the middle of its inner hole and a seal ring 18 fixed to a groove 17a provided at the front thereof. I have. The seal ring 18 is made of, for example, an elastic material such as rubber or an elastic molding resin, but a material having good confidentiality and slipperiness is selected. In addition, other considerations such as interposition of a lubricant are taken into consideration. Further, the seal ring portion can be formed integrally with the peripheral surface in the pressing cylinder.

Next, a tail plug 14 is inserted into the rear end hole of the cylindrical portion 10b.
Is fixed, and at this time, a spring 16 is laid between the valve body and the step portion 10d such that the spherical valve body 15 comes into close contact with the receiving seat 14d. A return spring 19 is laid between the step 10c of the ink container 10 and the front end of the pressing cylinder 17, and the step 17b is
The pressing cylinder 17 is locked at the front end of the
b can be moved back and forth. The pressure mechanism is configured as described above.

Before the pressing cylinder 17 is knocked (moving forward), the seal ring 18 is
The space 20 behind the pressing cylinder 17 communicates with the outside air through the groove 14c. That is, the space portion 20 is communicated with the outside air immediately before the pressing cylinder 17 advances, and is shut off from the outside air immediately after the pressing tube 17 appropriately advances, so that the space portion 20 is compressed and pressurized. Details will be described later in operation.

By the way, the ballpoint pen refill 2 shown in FIG.
1 shows another embodiment of the ballpoint pen 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 behind the pressing cylinder 17 communicates with the outside air through the groove 14c, and the return spring 4 and the knock spring 1
The setting power of 9 is so balanced.

Next, the operation of the pressing 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 becomes a stepped portion 2 provided on the front shaft 2.
b, the advancing thereof is prevented, and the pressing cylinder 17 starts to advance in conjunction with the knock cylinder 3 with respect to the cylinder portion 10b of the ink storage tube 10. As shown in FIG. 4, when the inner peripheral portion of the seal ring 18 comes into contact with the contact step 10e of the cylindrical portion 10b, the space 20 behind the pressing cylinder 17 is shut off from the outside air, and the pressing cylinder 17 is As the seal ring 18 further advances, the inner peripheral portion of the seal ring 18 slides in close contact with the outer peripheral portion of the cylindrical portion, 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 illustrating an operation state of a pressurizing mechanism section, 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 Ink storage unit 10b Tube 10c Step 10d Inner step 10e Contact step 10f Communication hole 11 Ink 12 Follower 13 Follower rod 14 Tail plug 14a Flange 14b Shaft 14c Groove 14d Receiving seat 14e Vent 15 Valve 16 Spring 17 Pressing cylinder 17a Groove 7b step 18 the seal ring 19 knock spring 20 space 21 Ballpoint refill

 ──────────────────────────────────────────────────の Continued on 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 KC16 KD09 KD10 NA00 NA10 NA18 2C353 HA01 HA09 HC04 HC16 HJ03

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. A ball-point pen refill that 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 further provided at the rear end of the ink storage tube. In a knock-type writing instrument that allows the tip of the tip to be locked in a protruding and retracting state, the knock mechanism of the knock cylinder provided from the rear end with the tip of the tip protruding is used. The air is forced into the rear end hole of the ink storage tube by operating the part forward, and the rear end of the follower is pressurized to support the fluidity of the ink to the chip side. A knock-type writing instrument characterized by the following. 2. A pressure mechanism, comprising: a pressing cylinder fixed to a rear end of an ink storage pipe via a spring so as to be capable of moving back and forth with respect to the ink storage pipe; The inside of the pressing cylinder is communicated with the outside air, and a seal portion provided so that the rear part of the pressing cylinder is shut off from the outside air immediately after advancing appropriately, and when the pressing cylinder further advances and the inside of the pressing cylinder is pressurized. 2. The knock-type writing instrument according to claim 1, further comprising: a valve body provided to open the valve at a predetermined pressure to press the rear end of the follower. 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.