JPH088151Y2 - Writing instrument pen core - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to an improvement of a pen core having an ink guide core for guiding ink to a writing section.

(Prior Art) Conventionally, as shown in FIG. 6, an ink guide core that is inserted into a pen core of a writing instrument and flows out ink to a writing part has a supporting part (C) rearwardly inserted and supported in the pen core. To form a small-diameter portion (A), and a portion (B) having the same diameter as the supporting portion (C) is formed behind the portion, and a portion (D) connected to the writing portion is formed in front of the supporting portion (C). However, the ink guide groove (E) is provided in the vertical direction, and when the ink is guided from the axial ink storage portion to the writing portion via the ink guide core, the expansion of the air in the ink storage portion If the amount of ink that flows out is excessive, the ink will flow into the pen core through the ink inlet groove of the pen core, and the ink will be stored in the parallel annular grooves (bellows) of the pen core. It prevents excessive outflow of ink (dropping) to the
When the amount of ink flowing out to the outside becomes small, the ink retained in the annular groove is discharged from the ink inflow groove of the pen core to compensate for this.

(Problems to be solved by the invention) However, in the above-mentioned conventional one, when the ink stored in the pen core is to be discharged to the outside, the ink is re-introduced into the guide groove of the ink guide core through the ink inflow groove of the pen core. However, since the small diameter portion (A) extends in the axial direction corresponding to the ink inflow groove of the pen core, the ink is supplied over the entire small diameter portion (A). The amount of ink flowing out through the ink guide core may be excessive, and it is impossible to sufficiently prevent dripping. On the contrary, there is a risk that the ink may overflow from the air holes due to the rapid inflow of the ink into the pen core. Therefore, this invention is intended to improve the drawbacks of the above-mentioned conventional ones, and intends to perform writing smoothly by sufficiently controlling the induction of ink to the writing portion.

(Means for Solving the Problem) For that purpose, a support portion which is located in the pen core in the front and rear direction to support the ink guide core is provided on an ink guide core which axially penetrates the pen core having a plurality of annular grooves on the outer periphery. Ink inflow that extends to the rear end of the annular groove in the axial direction that connects the ink guide core with the plurality of parallel annular grooves of the pen core is formed while forming a small diameter between the support part and the supporting part. A groove is provided, and an annular groove of a smaller diameter is provided at the rear end of the ink inflow groove at the smaller diameter portion.

(Operation) With the above configuration, when excessive ink is applied to the writing portion through the ink guide core supported by the support portion and the support portion in the pen core and supplied to the writing portion, It is intended to prevent excess ink from flowing out from the writing part by being stored in the annular groove of the pen core through the ink inflow groove of the pen core from the small diameter part between the support parts, and then to the overflow in the pen core. When the flowing ink flows out from the ink inflow groove to the ink guide core,
It does not flow out from the entire ink inflow groove, first flows from the pen core rear part through the ink inflow groove into the ring groove of the ink guide core, and is supplied to the writing part via the guide groove, so there is no excess ink amount, Even when the ink is stored in the pen core, more smooth writing can be performed, and since more ink flows in from the back of the ink guide core through the ring groove, the air provided at the boundary between the tip of the pen core and the shaft. Ink does not overflow from the holes.

(Example) This invention is demonstrated by the Example shown in a figure. (1)
Indicates a small diameter part of the ink guide core, which is formed to have a slightly smaller diameter behind the support part (2) with a step than the support part (2), and between the rear support part (3) and the pen core (11). An annular groove (4) having a diameter smaller than that of the small diameter portion (1) is provided at the rear of the ink storage annular groove (12). (9) is a connecting part that is inserted into the writing part (13) of the water-based ballpoint pen,
Reference numerals (5) and (6) are ink guide grooves for guiding ink from the axial ink reservoir (16) to the writing section (9).
It is provided up to 3) in the vertical direction. In particular, (7) and (8) are auxiliary ink guide grooves extending from the ink reservoir (16) to the rear of the ink guide core. (10) is a shaft, (12) is a plurality of annular grooves (bellows) arranged side by side in the axial direction on the pen core (11), (14) is the writing point of the pen core (11), Reference numeral 15) is an ink inflow groove that allows the ink to flow from the ink induction core into the annular groove (12) of the pen core (11), and is configured in a slit shape that extends to the rear end of the annular groove (12) sufficiently long in the axial direction. . (1
7) is an air hole through which the outside air passes through the annular groove (12) and is introduced into the ink reservoir (16) for exchange with the outflow ink.

With the above-mentioned structure, the ink guide core of the present invention is inserted into the pen core (11), and passes through this, and the tip writing section (13).
The front end of the ink is housed inside, and the rear ink outflow groove (5),
(6), (7) and (8) reach the ink reservoir (16) in the shaft (10), and the ink is stored in the ink reservoir (16).
It flows out toward the writing part (13), but if the amount of ink becomes excessive for writing, it is annular from the small diameter part (1) of the ink guide core through the ink inflow groove (15) of the pen core (11). Although the ink flows into the groove (12) and is stored therein, the ink hits the writing portion and is led out to the writing portion (13) through the guide grooves (5) and (6), and the ink is ejected from the annular groove (12). At this time, the ink inflow groove (15) is elongated in the axial direction and the ring groove (4) of the ink guide core is located at the rear end of the ink guide groove (6). ), The ink is first drawn out from the ring groove (4) to the writing part (13), and a large amount of ink is not drawn out at a time, so smooth writing can be performed. In addition, since there is a ring groove (4), it is possible to mitigate the sudden increase of ink here, Ink extension groove (1
5) Ink does not suddenly flow into the pen core (11), and since the ring groove (4) is provided at the rear, there is no risk of ink overflowing from the air hole (17). .

(Effect of the Invention) As described above, since the present invention is configured, the ink stored in the pen core can be outflowed or the ink can be inflowed into the pen core through the ring groove behind the pen core. It has an excellent effect as a writing instrument that can adjust the amount of ink to be discharged to the area without disturbing the outflow of ink from the ink storage part, and can also prevent the ink from overflowing from the air holes. .

[Brief description of drawings]

FIG. 1 is a plan view of an embodiment of the present invention, FIG. 2 is a rear view thereof, and FIGS. 3 and 4 are I--I, and FIG.
II-II longitudinal sectional view, FIG. 5 is a sectional view of a writing instrument equipped with the ink guide core of the present invention, and FIG. 6 shows a conventional ink guide core. 1 ... small diameter part, 2 ... supporting part, 3 ... supporting part, 4 ... ring groove, 5,6,7,8, ... guide groove, 10 ... writing tool shaft, 11 ... pen core, 12 ...... Annular groove, 15 …… Ink inflow groove, 16 …… Ink reservoir, 17 …… Air hole

Claims (1)

[Scope of utility model registration request] 1. A pen core which is housed in a writing implement shaft, connects the ink reservoir part and the writing part, has an annular groove on its outer periphery, and penetrates the ink guide core in the axial direction, and in front of the ink guide core. The ink guide core is supported in the pen core by the support portion provided on the rear side and the rear support portion, and a small diameter portion having a slightly smaller diameter is formed between the support portion and the support portion, and further, in the rear portion of the parallel annular grooves of the pen core. An ink inflow groove extending in the axial direction is provided to connect the annular groove and the ink guide core, and at the rear end of this ink inflow groove, an even smaller diameter annular groove is provided in the small diameter part of the ink guide core. A pen core of a writing instrument.