JP2002103874A - Stopper opening structure of ink tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve such a trouble that an ink tank is conventionally structured in such a manner as to activate an elastically deformable protrusion part provided on a stopper to push an ink guide member so that the opening of the ink tank stopper increases but this member comes off depending upon the way the member is fixed, to adversely affect the writing. SOLUTION: This stopper opening structure of the ink tank opens the stopper integrally molded with the ink tank by bringing a pressurizing element into contact with the stopper. The protrusion part which comes into contact with the pressurizing element after the start of a contact action between the stopper and the pressurizing element, is formed on the stopper, on the front side of the stopper and/or near the contact part between the stopper and the pressurizing element. Thus the opening of the stopper is prompted by a reaction generated by the contact between the protrusion part and the pressurizing element.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink tank opening structure in which a pressure member is brought into contact with a stopper integrally formed with an ink tank to open the ink tank. Here, examples of the ink include a writing liquid, a cosmetic liquid, and a correction liquid.

[0002]

2. Description of the Related Art Conventionally, there are roughly two types of ink tanks. The plug is formed separately from the ink tank body such as a ball or a disk, and the plug is formed integrally by injection molding or the like. The latter according to the present invention is generally more advantageous than the former in terms of ink leakage and cost. However, on the other hand, there is difficulty in opening. This will be described below. When opening the plug, insert a pressurized body such as a pen core rear end or a piercing portion of a joint member between the front shaft and the rear shaft into a mounting portion which is a front portion of the plug of the ink tank. And open the stopper. The opening is accompanied by breakage of the plug, and the contact force rapidly increases from the start of the contact to the start of the opening, and once the opening is started, the contact force rapidly decreases. From the viewpoint of the user, the pressing force is applied, and when this force suddenly becomes weak, the opening of the ink tank is detected. The problem is here. That is, opening of the ink tank is not completed by a decrease in the pressing force. Normally, after the opening of the cap is started, the relative displacement between the ink tank and the pressurizing body is advanced with a considerable stroke. This is because the opening amount is increased so that the ink-air replacement can be sufficiently performed. However, the user may be somewhat satisfied with the above-mentioned sensing and may not press the ink tank any more. In such a case, the ink-air replacement described above cannot be sufficiently performed.

Accordingly, Japanese Utility Model Registration Publication No. 251207
No. 8 publication has been devised. The utility model registration claims include an ink tank opening structure in which a pressurizing member is brought into contact with a stopper body integrally formed with the ink tank to open the stopper, and the stopper body front side and And / or elastic deformation in the vicinity of the abutting portion of the pressurizing body with the plug, serving as a contact start portion between the plug and the pressurizing body after the start of the contact between the plug and the pressurizing body. An opening structure for an ink tank, which forms a protruding portion that can be opened, and after the opening of the plug is started, the opening of the plug is advanced by the elastic deformation force of the protruding portion. " ing. That is, the plug is completely opened using the elastic deformation force of the projecting portion.

[0004]

The above prior art has a structure in which a pressurizing member is brought into contact with a plug integrally formed with an ink tank to open the plug. 1 is described in FIG. More specifically, a member indicated by reference numeral 6 is disposed inside the pressurizing body 5 in FIG. The member 6 is, for example, an ink guide core, a temporary ink reservoir member, or the like. The pressurizing body 5
It is also described that the and the member 6 may be integrated, but the illustrated example is configured separately. However, in the case where they are formed separately, the following problems may occur. That is, when the protruding portion 3 of the ink tank 1 comes into contact with the member 6 and the ink tank 1 is further pushed into the pressurizing body 5, the member 6 loses the pushing force and comes off from the pressurizing body 5. It becomes impossible to write. Although such a problem is prevented from occurring in the design, there is a need to improve it because it may be caused by a long-term use or by a change over time.

[0005] Therefore, the present invention, as shown in the above-mentioned prior art, allows the ink to be removed even if the relative displacement between the ink tank and the pressurizing member after opening of the ink tank is not sufficient. Replacement of air is sufficient, and
The opening of the ink tank is prevented from coming off.

[0006]

According to the present invention, there is provided an ink tank opening structure in which a pressure member is brought into contact with a stopper integrally formed with the ink tank to open the stopper. On the side and / or in the vicinity of the abutting portion of the pressurizing body with the plug,
After the start of contact between the plug and the pressurizing body, a projection is formed on the plug again to contact the pressurizing body, and the reaction force generated by the contact between the protruding portion and the pressurizing body, The point is that the opening of the plug is advanced.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings. In the following description, the left side of the drawing is referred to as “front” and the right side of the drawing is referred to as “rear”. 1 to 5 show an embodiment of the present invention. Reference numeral 1 denotes an ink tank main body, a storage unit 2 that stores ink, a plug 3 that seals the storage unit 2,
The plug 3 has a mounting portion 4 which is a front portion of the plug 3. The overall shape is cylindrical, and the rear end (not shown) is appropriately sealed by attaching a tail plug or the like. The material is an appropriate synthetic resin such as polyethylene or polypropylene. here,
The plug 3 has a flat wall surface (hereinafter, referred to as a rear surface) 3a on the side of the housing portion 2 and a frustoconical wall surface (hereinafter, referred to as a front surface) 3b on the side of the mounting portion 4. However, the inner wall 4 of the mounting portion 4
The peripheral portion 3c, which is a portion near a, is a constant thin portion, and the tapered wall 3d, which is a conical generatrix portion, is a connection portion with the peripheral portion 3c. In the center of the truncated cone of the front surface 3b of the plug 3, a protruding portion 3e protruding forward is formed. The protruding portion 3e has a relatively hard outer diameter and length that does not elastically deform due to the influence of the material of the plug 3 or the like.

On the other hand, reference numeral 5 denotes a pressing body, and a rear end 5a of the pressing body 5 projects in a semicircular shape (see a schematic drawing near 5a of the pressing body 5 in FIG. 2). Reference numeral 1 denotes a state in which the rear end 5a has entered the mounting portion 4 while being connected to the inner wall 4a of the mounting portion 4. Further, a member indicated by reference numeral 6 is arranged inside the pressure body 5. The member 6 is shown as being separate from the pressurizing body 5 such as an ink guide core, a temporary ink reservoir member, etc. It may be integrally formed.

The length of the protruding portion 3e of the stopper 3 is set in a state where the ink tank body 1 has moved to the stopper position (inner step 5c) in the pressurizing member 5 and the stopper 3 has been completely opened. Until (see FIG. 5), the length does not abut on the rear end of the member 6. This is because there is no problem if the member 6 is integrally formed with the pressing member 5 as described above. However, if the pressing member 5 and the member 6 are separate members, these members are fixed by some means. The fixing force may vary depending on the fixing means. Therefore, the contact between the member 6 and the protruding portion 3e proceeds, and at this time, the shearing force generated when the stopper 3 is opened becomes stronger than the fixing force between the pressing body 5 and the member 6. If this occurs, the member 6 comes off the pressurizing body 5, and as a result, writing becomes impossible. Although FIG. 1 illustrates a fountain pen, as described above, when the member 6 comes off the pressurizing body 5, there is a risk that the pen tip 7 held and fixed therebetween may come off.

Next, a specific method for opening the ink tank will be described with reference to FIGS. FIG. 3 shows that the contact between the rear end 5a of the pressure body 5 and the front surface 3b of the plug 3 advances,
This shows a state immediately before the plug 3 starts to break as a result of a shearing force being applied to c. That is, during the transition from the state shown in FIG. 1 to the state shown in FIG. 3, the rear end 5a of the pressurizing member 5 is kept in contact with the front surface 3b of the plug 3. Here, since the rear end 5a of the pressurizing body 5 projects in a semicircular shape (see FIG. 2), the opening force thereof is
Although it is directly applied to the front surface 3b of the plug 3, the opening force is substantially applied to the peripheral portion 3c corresponding to the upper part in the figure. The peripheral portion 3c extends until immediately before the breakage, despite the shear force gradually increasing, and at this time, the plug body 3 has a peripheral portion corresponding to 180 ° opposite to the opening force. Tilt around 3f as a fulcrum. When the contact proceeds further, the peripheral edge portion 3c loses the shearing force due to the opening force and starts to break, and opening is started from this time. In addition, the pressing body 5
The contact of the mounting portion 4 with the inner wall 4a is started immediately before the plug 3 starts to break, and from this time, the plug 3 is pressed into the mounting portion 4.

FIG. 4 shows a state in which the rear end 5a of the pressing body 5 and the entire surface 3b of the plug 3 further advance, and a shearing force is applied to the peripheral portion 3c, and as a result, the plug 3 is broken. That is, the state after the start of opening is shown. Since the plug 3 is pushed by the rear end 5a projecting in a semicircular shape of the pressurizing member 5, the inclination is further increased with the peripheral portion 3f opposite 180 ° as a fulcrum. Of the pressing body 5
Abuts against the inner wall 5b of the rear end 5a. Here, if the pressurizing body 5 moves further and the contact with the stopper 3 advances, the inclination of the stopper 3 becomes further larger with 3f as a fulcrum, and the protrusion 3
e and the contact amount between the inner wall 5b and the inner wall 5b also increase, and the increased reaction force due to this contact further promotes the inclination of the plug 3. When the contact reaction force causes a sudden decrease in the contact force that occurs after the opening of the plug is started, the contact force is converted into a force that further breaks the plug 3 using the reaction force. Thus, even if the relative displacement between the ink tank and the pressurizing member is not sufficiently large after the start of the opening, the opening amount increases. This is because the reaction force due to the contact force of the projecting portion on the inner surface of the pressurized body is used.
As described above, the protrusion 3e of the plug 3 is relatively hard without elastic deformation. Although the reaction force is prevented from decreasing due to elastic deformation, some elastic deformation is allowed. FIG. 5 shows a state in which the ink tank body 1 has moved to the stopper position 5c in the pressurizing member 5 and the opening of the stopper 3 has been completed.

[0012]

According to the present invention, there is provided an ink tank opening structure in which a pressure member is brought into contact with a stopper integrally formed with the ink tank to open the stopper. In the vicinity of the contact portion of the pressurizing member with the plug, after the start of contact between the plug and the pressurizing member, a projection is formed on the plug again to contact the pressurizing member, Since the opening of the plug is advanced by the reaction force due to the contact between the protruding portion and the pressing body, the relative displacement between the ink tank and the pressing body after the opening of the ink tank is sufficient. Even without this, the ink tank opening amount can be made sufficient, the air can be sufficiently replaced in the ink tank, and there is no detachment of the component parts, and the difficulty of opening can be suppressed accordingly.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an embodiment.

FIG. 2 is a schematic diagram of a pressing body 5 according to an embodiment.

FIG. 3 is a longitudinal sectional view of the embodiment.

FIG. 4 is a longitudinal sectional view of the embodiment.

FIG. 5 is a longitudinal sectional view of the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ink tank main body 2 Storage part which stores ink 3 Plug body 3a Rear surface 3b Front surface 3c Peripheral edge 3d Tapered wall 3e Projection 3f Peripheral edge 4 Mounting part 4a Inner wall 5 Pressurizing body 5a Rear end 5b Inner wall 5c Inner surface step member 6 7 Pen tip

Claims (1)

[Claims] 1. An opening structure of an ink tank in which a pressurizing body is brought into contact with a plug body integrally formed with the ink tank to open the ink tank, wherein the plug body front side and / or the pressurizing body is provided. After the contact between the plug and the pressurizing body is started, a protruding portion that comes into contact with the pressurizing body is formed in the plug near the contacting portion with the plug, and the protruding portion is added to the protruding portion. The opening structure of the ink tank, wherein the opening of the stopper is advanced by a reaction force caused by contact with the pressure body.