JPS622148Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an ink outflow control mechanism for a water-based ink ballpoint pen.

[Conventional technology]

In a water-based ink ballpoint pen, it is necessary that the ink always leaches in just the right amount during writing, regardless of changes in temperature or atmospheric pressure.

In this type of ballpoint pen, the ink flows around the solid core and is supplied to the ball at the tip. However, the amount of ink in the reservoir decreases due to the temperature of the writer's hand or the outside air temperature. If the resulting decrease in air pressure in the reservoir is not properly compensated for, the ink will not seep out smoothly.
Eventually it becomes impossible to write.

In order to eliminate this kind of inconvenience, when the ink or air in the reservoir expands, the ink that is about to flow out is bypassed to a place other than the ball and temporarily stored, and the ink inside the reservoir is If the pressure decreases, outside air may be automatically introduced into the reservoir.

However, it is by no means easy to obtain an ink outflow control mechanism that can appropriately prevent excess outflow of ink caused by expansion of air in the reservoir due to temperature changes.

In particular, once excess ink is spilled into the control mechanism due to a sudden change in temperature or pressure, it will not return to its original state even if it is in an inverted position when not in use inside the storage cylinder, and the air exchange hole that communicates with the outside air will The ink will ooze out and stain the shaft.

[Problem that the invention attempts to solve]

In the past, various proposals have been made to achieve this purpose, but all of them have complex structures and cannot necessarily be said to be functionally satisfactory.

An object of the present invention is to effectively retain excess ink caused by expansion of air in the reservoir due to changes in temperature or pressure in a control mechanism, and appropriately prevent it from seeping out through air conversion holes communicating with the outside air. The object of the present invention is to obtain an ink outflow control mechanism with a simple configuration.

[Means for solving problems]

According to the present invention, the above purpose is to guide the ink to the writing part through the ink outflow control cylinder 2, which prevents the ink from accidentally outflowing due to pressure increase or air expansion of the ink storage part 4 in the barrel cylinder 7. In a water-based ink ballpoint pen equipped with an inductive core 3, an appropriate number of receiving rings 5, 6 are provided at the front and rear of the outer surface of the ink flow control cylinder 2, and a suitable number of receiving rings 5, 6 are provided in contact with the inner surface of the shaft cylinder 7, and a ring with a slightly smaller diameter is provided in the intermediate part thereof. Annular piece 10 of
This can be solved by providing a plurality of annular pieces 10 and making the width of the annular groove 8 between the annular pieces 10 smaller than the radial width of the gap 9 between the outer periphery of the annular piece 10 and the inner surface of the shaft cylinder 7.

〔Example〕

An embodiment of this invention will be described based on the drawings.

In the figure, reference numeral 1 denotes a ball holding cylinder of a ballpoint pen, the rear end of which is press-fitted into the tip of an ink flow control cylinder 2, and a hole 2a of which holds a ball 1a.
An inductor core 3 consisting of an ink-absorbing fiber bundle or a molded core is fitted for introducing ink into the ink.

The rear end of the guide core 3 slightly protrudes from the shaft hole 2a of the ink outflow control cylinder 2 and reaches the ink reservoir 4 formed in the shaft cylinder 7.

In order to prevent the ink in the ink reservoir 4 from leaking around the ink flow control cylinder 2, approximately the middle part and the rear end of the ink flow control cylinder 2 are provided with:
A plurality of receiving rings 5 and 6 are respectively formed, and each receiving ring 5 and 6 is press-fitted into the shaft cylinder 7.

A large number of slightly small-diameter annular pieces 10 are formed between the front and rear receiving rings 5 and 6 in the ink flow control cylinder 2, and a gap 9 is formed between the annular pieces 10 and the inner surface of the shaft cylinder 7. is formed. The width of this gap 9 in the radial direction is slightly larger than the width of the annular groove 8 between the annular pieces 10.

In addition, on one rear side of the ink flow control cylinder 2,
A narrow ink flow groove 11 in the axial direction is cut out to communicate with the shaft hole 2a.

A narrow axial ink flow groove 11 that communicates with the shaft hole 2a is cut in one side of the rear portion of the ink flow control cylinder 2 that includes the annular piece 10. Furthermore, on the side surface opposite to the ink outflow groove 11, an air exchange groove 12, which is slightly wider than the annular groove 8, is cut in the annular piece 10 in the axial direction.

Furthermore, air introduction grooves 14 for introducing outside air are provided at different positions in the circumferential direction in the front receiving ring 5 and the locking collar 13 provided in front of the locking collar 13 for the front end of the shaft cylinder 7. It is being

The respective annular grooves 15 between the rear receiving rings 6 are sequentially communicated in the front-rear direction via a ramp 16. A narrow ink groove 17 is cut into one side of the rearmost receiving ring 6a.

In the above embodiments, the ink is, as is known,
It is led out from the guide core 3, passes through the inner surface of the ball holding cylinder 1, and flows out into the ball portion.

The air equivalent to the ink consumed by writing is
From the air exchange groove 12 to the annular groove 8 and the ink outflow groove 11
Since the ink is easily replaced by the ink reservoir 4 via the ink storage section 4, defects such as running out of ink will not occur.

When not in use, the ink in the ink reservoir 4 is sucked into the ink outlet 11 by capillary action and prevents outside air from flowing into the ink reservoir 4, so that a stable state can be maintained.

If the temperature increases or the atmospheric pressure decreases when the ink in the ink reservoir 4 is less than half,
Due to the expansion of the air in the ink storage section 4, excess ink flows through the ink outlet groove 11 via the guide core 3.
As a result, the ink flows into the annular groove 15 having a large outer diameter at the rear end of the ink outflow control cylinder 2 and is retained therein.

When the temperature drops, this excess ink easily returns to the ink reservoir 4 via the guide wick 3 due to capillary action.

The receiving ring etc. in the conventional ink flow control cylinder,
When inserted into the shaft cylinder, it tilts and narrows the annular groove between them, which increases the capillary action and also prevents uneven capillary action from acting between the receiving ring and the shaft cylinder. As the temperature rises, excess ink in the ink reservoir is not uniformly discharged into the annular groove, and the excess ink is discharged into the annular groove near the air introduction groove at the front end of the ink outflow control cylinder.
Ink may be ejected with priority.

Furthermore, even when the temperature drops, excess ink is not returned to the reservoir, and the ink leaks out from the air introduction groove and stains the shaft.

However, according to the present invention, as described above, the annular piece 10 of the ink flow control cylinder 2 has a smaller diameter than the front and rear receiving rings 5 and 6, and has a gap 9 between it and the shaft cylinder 7.
Therefore, the annular piece 10 will not fall down and the annular groove will not become narrow.

In addition, even when the temperature suddenly rises, excess ink in the ink reservoir is discharged and retained, giving priority to the annular groove at the rear end of the ink outflow control cylinder, so ink overflows to the outside from the air introduction groove. You can prevent it from coming out.

Moreover, since the width of the gap 9 between the outer periphery of the annular piece 10 and the barrel 7 is larger than the width of the annular groove 8 between the annular pieces 10, the ink is retained in the annular groove 8 by capillary action. , Even if you wave a ballpoint pen,
The ink in the annular groove 8 only flows into the cavity 9 and does not flow out from the air hole.

[Brief explanation of the drawing]

FIG. 1 is a vertical side view of a water-based ink ballpoint pen equipped with an embodiment of the ink outflow control mechanism according to the present invention, FIG. 2 is a vertical side view of the ball holding cylinder and a side view of the guide core, and FIG. Figures 4 to 7 are vertical side views of the ink flow control cylinder fitted into the shaft cylinder.
A-A line, B-B line, and C-C in Fig. 3, respectively.
8 is a partially vertical side view of the ink flow control tube taken out from the barrel, and FIG. 9 is a vertical side view of the ink flow control tube. 1...Ball holding tube, 1a...Ball, 2...
Ink outflow control cylinder, 2a...Shaft hole, 3...Guiding core, 4...Ink reservoir, 5, 6...Receiving ring, 6
a... Reception ring, 7... Shaft cylinder, 8... Annular groove, 9...
... Gap portion, 10 ... Annular piece, 11 ... Ink outflow groove, 12 ... Air exchange groove, 13 ... Locking collar, 14
... Air introduction groove, 15 ... Annular groove, 16 ... Ramp, 17 ... Ink groove.

Claims (1)

[Scope of utility model registration request] A water-based ink ballpoint pen equipped with a guide core 3 that guides ink to a writing section via an ink flow control tube 2 that prevents ink from accidentally flowing out due to a pressure increase in an ink storage section 4 or air expansion within a barrel tube 7. , an appropriate number of receiving rings 5 and 6 are provided on the front and rear sides of the outer surface of the ink flow control cylinder 2, which contact the inner surface of the shaft cylinder 7, and a plurality of annular pieces 10 having a slightly smaller diameter are provided in the intermediate part thereof, and Ink flow from a water-based ink ballpoint pen characterized in that the width of the annular groove 8 between the annular pieces 10 is smaller than the radial width of the gap 9 between the outer periphery of the annular piece 10 and the inner surface of the shaft tube 7. Control mechanism.