JPH074071U - Capillary writing instrument - Google Patents

Abstract

(57) [Summary] [Constitution] Normally, the elastic force of the elastic body 9 causes the core 8 to protrude from the small-diameter pipe 4. A capillary writing instrument for writing by compressing the elastic body 9 by pressing the center core 8 against the surface of the paper at the time of writing to exude the ink absorbed by the elastic body 9. The elastic body 9 is composed of a polyurethane foam having a rib structure in which 50% or more of the foam film is removed. Further, the number of pores of the elastic body 9 is formed to be 100 or more and 200 or less and the porosity is formed to be 40% or more and 80% or less. [Effect] The ink can pass through the elastic body 9 well, and the ink surely follows even when high-speed writing is performed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a drawing-type writing instrument for drawing or plotter in which the center of a small-diameter pipe appropriately protrudes.

[0002]

[Prior art]

 In the conventional thin-tube writing instrument, the elastic body that projects the core is made of a rubber sponge.

[0003]

[Problems to be solved by the device]

 However, the rubber sponge that has been used in the past has a partition wall film, which is a hindrance to ink circulation and ink cannot follow when high-speed writing is performed, and the handwriting becomes faint, making high-speed writing at 40 cm / s or more impossible. It was possible. An object of the present invention is to provide a capillary writing instrument that solves the above problems.

[0004]

[Means for Solving the Problems]

 The present invention normally causes the elastic core of the elastic body to appropriately protrude the core from the small-diameter pipe, and when writing, presses the core against the paper surface to compress the elastic body and exude the ink absorbed by the elastic body. In a writing instrument for capillary writing, the elastic body is composed of a polyurethane foam having a rib structure in which 50% or more of the foam film is removed. Further, the number of pores of the elastic body is formed to be 100 or more and 200 or less and the porosity is formed to be 40% or more and 80% or less.

[0005]

【Example】

 The elastic body used in the capillary writing instrument of the present invention has a rib structure in which the foam film of polyurethane foam is removed by 50% or more by explosive removal or chemical dissolution method. This rib-structured polyurethane foam is compressed to form elongated holes. In addition, in order to improve the flowability of the ink and to prevent the ink from dripping, the number of pores of the elastic body is set to 100 or more and 200 or less and the porosity of the elastic body is set. Of 40% or more and 80% or less. This elastic body is used for a thin-tube writing instrument in which the elastic core of the elastic body causes the middle core to protrude from the small-diameter pipe, and it is used by attaching it so that elongated pores extend in the ink flow direction. As a result, the thin-tube writing instrument using the elastic body can write at a high speed of 80 cm / s. As a capillary writing instrument using the elastic body of the present invention, for example, there is a capillary writing instrument for a plotter shown in FIG. This has a labyrinth structure in which a pen core 2 is press-fitted and joined to a front portion of an ink tank 1 that stores ink, and the air introduced from an air hole 2A into the pen core 2 is guided to the ink storage unit 1A. The groove 2B is formed to adjust the internal pressure of the ink storage portion 1A. As for the structure of the writing portion, as shown in FIG. 2, a small-diameter pipe 4 made of a hard thin tube such as ceramic is press-fitted and fixed to a holder 3 made of synthetic resin. Further, a protective pipe 5 made of metal such as stainless steel for protecting the small diameter pipe 4 is press-fitted and fixed to the holder 3. A front part of a metal tip 6 is press-fitted and fixed to the outside of the holder 3, and a synthetic resin joint 7 is press-fitted and fixed to the rear part of the tip 6. A plurality of ribs protruding inward are formed in the inner hole 7A of the joint 7 so as to extend in the longitudinal direction. Further, the rod-shaped portion of the center core 8 having the bent rear portion is inserted into the small-diameter pipe 4, and the elastic body 9 is formed so that the elongated pores of the polyurethane foam having the rib structure extend in the ink flow direction. Is sandwiched between the bent portion 8A of the core 8 and the front end of the joint 7, and the tip of the core 8 is appropriately protruded from the small diameter pipe 4 by the elasticity of the elastic body 9. The tip 6 of the writing part is fixed to the front part of the pen core 2 shown in FIG. 1, and the joint 7 is inserted into the inner hole 2C of the pen core 2. A tail plug 10 is fixed to the rear portion of the ink tank 1 in which ink is stored by ultrasonic welding or press fitting.

[0006]

[Effect of device]

 As described above, the thin-tube writing instrument of the present invention is configured such that the number of holes in the elastic body is 100 / inch or more and 200 / inch or less, and the porosity of the elastic body is 40% or more and 80% or less. By forming it, the ink smoothly flows through the elastic body and is guided to the tip of the writing, high-speed writing can be performed without scratching the handwriting, and the effect of preventing ink dripping can be obtained.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a capillary writing instrument according to the present invention.

FIG. 2 is an enlarged sectional view of a main part showing a writing part of the capillary writing instrument in FIG.

[Explanation of symbols]

 4 Small diameter pipe 8 Core 9 Elastic body

Claims (1)

[Scope of utility model registration request] 1. Usually, the elastic core of the elastic body causes the central core to appropriately protrude from the small-diameter pipe, and at the time of writing, the central core is pressed against the paper surface to retreat to compress the elastic body so that the ink absorbed in the elastic body is removed. In a capillary writing instrument for exuding and writing, the elastic body is composed of a polyurethane foam having a rib structure in which a foam film is removed by 50% or more, and the elastic body has 100 or more pores / inch and 200 pores or more. / Inch or less and porosity of 40% or more and 8
A capillary writing instrument characterized by being formed to 0% or less.