JPH036912B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a printing device, and more particularly to a dot printing device that can easily print not only on flat surfaces but also on curved surfaces.

The present invention also relates to a printing device capable of simultaneously printing in multiple colors.

[Prior Art and its Problems] Conventionally, handwriting with a brush or the like is used as a starting point, and printing using a stencil or handwriting is replaced with an X-Y drafter.

Furthermore, printing devices have also appeared in which a plurality of dot nozzles are lined up and each dot nozzle is selectively activated to eject ink for printing.

However, it goes without saying that handwriting is extremely inefficient and the printing is unclear, and when using a stencil, the printing is clear but not only is it difficult to follow the unevenness of the surface of the printed object, but the efficiency is no different from handwriting. ,
When the characters change, the stencil itself must be replaced, which tends to stain the workers' hands, and the burden on the workers is sometimes greater than handwriting.

Printing using an X-Y drafter does not require an operator, but the printing speed is slow because it is written with a single stroke, and it cannot follow the curved surface of the printed object or unevenness, resulting in parts of the print being chipped or the brush function being damaged. There were some issues that were confusing. There was also a tendency for ink to run out.

The dot nozzle method has the advantage of high printing speed and good ability to follow the unevenness of the surface of the printed object, but it has the inherent disadvantage of poor printing contrast.
Further, there is a problem in that it is impossible to avoid contamination of the printed object, the printing device itself, and surrounding areas due to ink scattering.

Furthermore, although it is not impossible to print in multiple colors using the dot nozzle method, as mentioned above, the contrast is poor, resulting in color bleeding and blurring.

[Purpose of the invention]

The purpose of the present invention is to
To provide a printing device capable of printing at high speed with clear contrast and good adhesion.

Another object of the present invention is to provide a high-speed printing device that is easy to maintain and less likely to cause contamination of the surrounding area.

Still another object of the present invention is to provide a high-speed printing device that enables clear multicolor printing.

[Structure of the invention]

According to the present invention, there is provided a hollow saw-shaped dot element comprising a tip acting part having one or more pasty ink discharge ports and a cylindrical sliding part fixed to the acting part and having an ink hose connector and a stopper at its rear end. and a frame into which the sliding portion is slidably fitted via an elastic body that biases the tip acting portion of the dot element in a direction to separate it.

is provided.

The present invention will be explained in detail below using Examples.

FIG. 1 is a sectional view of the main parts of the present invention.

In FIG. 1, the hollow saw-shaped dot element 1 is placed facing downward.

Although the tip acting portion 2 of the dot element 1 is flat in this embodiment, it is of course possible to have a convex or concave shape.

Further, the action part itself is usually made of metal, but it may also be made of materials with poor rigidity such as rubber, plastic, cloth, etc. Of course, highly elastic metals can also be used.

However, the working part 2 does not necessarily have a part 1 through which the ink passes.
At least three ink ejection ports 3 must be opened. The shape of the ink discharge port 3 is most commonly a round hole, but it may also be an elliptical hole or a square hole.

A cylindrical sliding part 4 is welded onto the acting part corresponding to the umbrella part of the mushroom valve, and an ink hose connector 5 and a stopper 6 are provided at the upper end thereof.

Here, the ink hose connector 5 is a connector for connecting the ink hose 7 and the dot element 1, and the stopper 6 is a connector for connecting the ink hose 7 and the dot element 1. This is to prevent it from getting cluttered. The spring 7 is an example of an elastic body, and may be made of rubber, plastic, a cylinder mechanism, or an electromagnetic solenoid mechanism.

[Operation of the present invention]

FIG. 2 is a sectional view of the action part of the dot element.
Fig. 3 is a bottom view of the lower surface of the action section, Fig. 4 is a front view of the action part in pressure contact with the plane of the printed object via ejected ink, and Fig. 5 is the state of the ink after printing. FIG.

Ink is supplied from the ink tank to the action portion of the dot element through the ink hose under a light back pressure such as air pressure. The viscosity of the ink is relatively determined by the diameter of the ink ejection opening of the working part, but a paste-like ink with a slightly higher viscosity is preferably used for the applications described below. In this case, the diameter of the ink ejection port is
Approximately 0.1 to 0.8 mm is convenient.

In the present invention, the paste-like ink includes, for example, those made by dispersing milk of lime or glaze using water as a dispersion medium, as well as various ordinary printing inks (organic,
The concept also includes coating compositions such as inorganic colorants + pigments or dyes, metal powders) and paints.

As shown in FIGS. 2 and 3, the ink 13 is ejected to the front surface of the dot element action section before it comes into contact with the object to be printed, and becomes ejected ink 14.

Next, when the dot element approaches the printing object 30 and comes into pressure contact with it, the ejected ink is deformed as shown in FIGS. 4 and 5, and its shape is maintained even after the dot element is separated. After printing, the central portion of the ejected ink is crushed by the front surface of the dot element action portion, forming a ring-shaped bank around the outer periphery.

As a result, the contrast of printing is significantly improved.

The ink that adheres to the printing object then dries naturally.
Or it is heated and dried.

Note that the dot element is the minimum unit of a printing device, and printing or pattern printing can be obtained by using a large number of these dot elements together.

[Application examples of the present invention]

FIG. 6 is a front view showing an applied embodiment of the present invention in which dot elements are arranged in rows.

In FIG. 6, a plurality of dot elements 1 are arranged in a row on a lower frame 20A of a rectangular frame 20,
An ink branch pipe 25 is built into the rectangular frame 20,
The upper frame portion 20B is further connected to the rod 11 of the air cylinder 10 provided in the outer frame 21, and the rectangular frame body 20 slides up and down along a guide 22 (not shown) of the outer frame 21. It's getting old.

FIG. 7 is a bottom view of an embodiment in which the row-shaped dot element groups shown in FIG. 6 are further combined to enable numeric printing.

By combining in this manner, numbers 0 to 9 can be easily printed by selectively activating each column-shaped dot element group.

Furthermore, it is also possible to make the dot element group into a desired planar shape so as to completely fill the required area.

In this case, it is of course possible to electrically selectively operate only the dot elements or dot element groups corresponding to printing or pattern printing in combination with a known control device.

In addition, multicolor printing is also possible by changing the ink for each dot element or group of dot elements.

[Effects of the present invention]

By implementing the present invention, all of the above objectives are achieved.

That is, it is possible to print accurately and with clear contrast at high speed on a printing object having an uneven surface.

It is also possible to print any pattern in multiple colors at the same time.

The present invention particularly provides a hot-rolled coil coated with anti-rust oil,
It is useful for steel and metal products such as cold-rolled coils, but it goes without saying that it is also useful for other uses.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of the dot element of the present invention, Fig. 2 is a sectional view of the action part of the dot element, Fig. 3 is a bottom view of the action lower surface of the dot element, and Fig. 4 is a sectional view of the action part of the dot element. Fig. 5 is a plan view showing the state of the ink after printing; Fig. 6 shows an applied example in which dot elements are arranged in a row. The front view and FIG. 7 are bottom views of an embodiment in which dot element groups are combined. 1... Dot element, 2... Tip acting part, 3...
Ink discharge port, 4... cylindrical sliding part, 13... ink, 14... discharge ink.

Claims (1)

[Scope of Claims] 1. A hollow saw valve consisting of a tip acting part having one or more pasty ink discharge ports, and a cylindrical sliding part fixed to the acting part and having an ink hose connector and a stopper at its rear end. 1. A printing device comprising: a dot-shaped dot element; and a frame body into which the sliding part is slidably fitted via an elastic body that biases the tip acting part of the dot element in a direction to separate the dot element. 2. The printing device according to claim 1, wherein the dot elements are arranged in rows or groups. 3. The printing device according to claim 1 or 2, comprising an automatic pressure mechanism that presses one or more dot elements close to the object to be printed. 4. The printing device according to any one of claims 1 to 3, wherein ink of a different color is supplied to each dot element forming a group of one or more dot elements.