JPS6325171Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a printing device having a cylindrical printing plate.

Conventionally, a stamp pad containing a desired mark or character is formed on the surface of a cylindrical (ring-shaped) body made of metal or rubber, and a stamp pad containing ink or ink is applied to the surface of the stamp pad. Printing devices are widely used that print marks, characters, etc. in the shape of a stamp plate by pressing the surface of a coated roll to adhere ink and then bringing it into contact with a predetermined position on an article.

However, such a printing device has the disadvantage that it requires a separate ink supply means, such as pressing a stamp pad or the surface of an ink-coated roll against the printing plate surface to deposit the ink. In order to solve this problem, rubber with many pores is made into a cylindrical shape, and a stamp is engraved on the surface of the cylindrical body.
A printing device that supplies ink through pores from the back side (inner diameter side of the cylindrical body) on the surface of this stamp plate can be considered, but with such a stamp plate made of porous rubber, there is a pressing force against the printing surface of the article. The line width that forms the marks and characters printed differs depending on the type of printing. Also, when printing a large number of items at high speed,
The initial printing characteristics cannot be maintained for a long time due to severe wear on the printing plate surface, and the biggest drawback, which is related to the nature of the ink used, is that smearing occurs, and marks and letters are stuck together, making it impossible to print clearly. Ta.

The present invention was developed in view of the various drawbacks of the conventional printing apparatuses as described above, and examples thereof will be explained in detail below with reference to the drawings.

1 is a cylindrical (ring-shaped) stamp made of porous ceramic, on the surface of which is engraved an uneven stamp 1a for printing marks, characters, etc.;
Furthermore, a pipe-shaped rotating shaft 2 that is driven to rotate and supplies ink is inserted into the inside of the printing plate 1, and the printing plate 1 and the rotating shaft 2 are rotated coaxially by, for example, a pin 3. It is fixed. Further, the rotating shaft 2 is provided with ink outflow holes 2a at key points, and the ink that comes out from the outflow holes 2a is absorbed by cotton, cotton, etc.
Ink made of a fiber aggregate such as felt is stored in the storage body 4. Note that the rotating shaft 2 is connected to a rotational drive source and an ink supply source (not shown),
It is configured to rotate in the direction of the arrow and to be able to constantly supply ink.

By the way, the cylindrical stamp 1 is made of porous ceramic, and examples of such porous ceramic include alumina (Al ₃ O ₃ ), cordierite, mullite,
It is preferable to use a material made of silicon carbide or the like, which has a water absorption rate of about 5 to 40%, is highly absorbent, and has a pore size that allows ink to pass through.The optimal value for the average pore size of the pores through which the ink passes is , varies depending on the properties of the ink used for printing. In other words, it differs depending on whether it is an oil-based ink or a water-based ink, and it also varies greatly depending on the concentration and the size of the water in the pigment particles.Inks with low viscosity and small pigment particles have pores with a small average pore diameter. Porous ceramic may be used. However, when the average pore diameter is small, the pores are likely to become clogged, and ink flow tends to gradually deteriorate. On the other hand, if the average pore diameter is large, a highly viscous ink can be used, but the quality of the printed image will be rough and it will be difficult to print clearly. Therefore, suitable porous ceramics have an average pore diameter in the range of 10 to 60 microns.

Furthermore, although the hardness of porous ceramics is considerably lower than that of dense ceramics, it is still considerably higher than that of rubber or type alloy, and therefore the degree of wear is low even when printing is performed frequently. Furthermore, the thermal expansion coefficient is approximately 7.0×10 ^-6 /℃ at maximum,
Furthermore, since it has high heat resistance, the stamping plate 1 is constructed which is less affected by temperature.

The printing device according to the present invention as described above is rotated by the driving force transmitted to the rotating shaft 2, and the ink that is also sent through the rotating shaft 2 and stored in the occlusion body 4 is sent to the printing plate 1 made of porous ceramic. The surface of the stamp plate 1 is in a wet state through the hole, and comes into contact with a paper K placed on a pedestal P, for example, and by applying ink, a predetermined character, mark, etc. is printed on the paper K. can be printed.

Note that a mechanism for sending air or cleaning liquid through the pipe 2 to unclog the pores in the printing plate 1 may be provided. In addition, if the stamp 1a to be engraved on the stamp 1 is of a fixed shape and a large number of stamps are required, the stamp 1 made of porous ceramic is molded using a predetermined mold and fired. It can be manufactured at low cost.

As mentioned above, according to the present invention, since the printing plate is made of porous ceramic, the ink required for printing can be supplied to the surface through the printing plate itself, so there is no need for any other ink supply mechanism. It is possible to provide a durable printing device that maintains stable printing characteristics for a long period of time.

[Brief explanation of the drawing]

The figure shows a cross-sectional structure of a printing device according to an embodiment of the present invention. 1: Stamp plate, 2: Rotating shaft, 3: Pin, 4: Occlusion body.

Claims (1)

[Scope of utility model registration request] In a printing device equipped with a cylindrical stamp for printing desired marks, characters, etc. by depositing ink on the surface of an article, the stamp has an average pore diameter of 10 to
A printing device that is made of a porous ceramic body with a diameter of 60 μ and has an occlusion body built into the cylinder of the printing plate that absorbs ink sent through a rotating shaft and supplies the ink to the printing plate. .