JPS61246065A - Printing method - Google Patents

Abstract

PURPOSE:To eliminate noise, by a system wherein a body to be printed is disposed with a gap between it and the peripheral surface of an ink roller rotated with a liquid ink adhered to the peripheral surface thereof, and the liquid ink is adhered to the surface of the body by a movable piece reciprocated in the gap, thereby printing. CONSTITUTION:The surface of the ink roller 1 is constantly covered by a film 10 of the liquid ink 8 supplied from an ink fountain 7. When no voltage is impressed on a bimorph 3, the movable piece 4 fitted to the bimorph 3 is located at position 4a, but when a voltage for bending the bimorph 3 to the ink roller 1 side is impressed, the piece 4 comes into contact with the surface of the ink roller 1, and the liquid ink 8 is built up on the piece 4. When a voltage for bending the bimorph 3 to the side of the body 2 to be printed is impressed, the movable piece 4 is moved to position 4b to make contact with the surface of the body 2, whereby the ink 8 is adhered to the body 8. With an electrical signal cut off, the piece 4 is returned to position 4a. This operation is repeated while moving the body 2, whereby a row of dots of the ink 8a can be printed on the body 2. Accordingly, printing can be performed with a small force, and no noise is generated.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a printing method that can be used in printers (printing machines) and the like, and which makes it possible to immediately convert electrical signals into printed matter.

BACKGROUND OF THE INVENTION Several printing methods are currently in use for immediately converting electrical signals into printed matter. However, these printing methods do not necessarily satisfy the needs of users; the reality is that there is no printer that is quiet, requires no maintenance, has high print quality, is highly reliable, and is inexpensive. . The wired top print has traditionally been most commonly used as a printer that can almost satisfy the above performance.

In this printer, a wire is attached to an electromagnetic movable piece, and the tip of this wire is connected to the paper (printing material) on which the ink ribbon is layered.
A printing method is used in which the ink from the ink ribbon is transferred to the surface of the paper.

This method is highly reliable, inexpensive, and widely used.

Problems to be Solved by the Invention However, in the above-mentioned conventional method, the wire is forcefully struck against the surface of the paper via the ink ribbon, which generates a considerable amount of noise.

The present invention solves the above-mentioned problems and aims to provide a printing method that can realize a noise-free printer.

Means for Solving the Problems ゛ In order to solve the above problems, the printing method of the present invention is as follows:
A printing material is placed with a gap from the surface of a rotating ink cloth with liquid ink applied to the surface, and a movable piece that reciprocates within this gap causes the liquid ink on the ink roller to adhere to the surface of the printing material. It is printed by

According to the method described above, since the movable piece that reciprocates in a small gap between the ink roller and the printing medium is slightly moved, no noise is generated.

EXAMPLE Hereinafter, an example of the present invention will be described based on FIGS. 1 and 2.

FIG. 1 is an explanatory diagram of the operating principle of a printing method in an embodiment of the present invention, and FIG. 2 is an explanatory diagram of the printing principle.

1 is an ink roller, 2 is a printing medium, 3 is a bimorph, 4
is a movable piece, 5 is a fixed base, 6 is a signal source, 7 is an ink pot, 8
is liquid ink, 9 is a protrusion, 1o is a coating of liquid ink 8,
4a is the movable piece at the initial position, 4b is the movable piece at the ink transfer position, 8a is the transferred liquid ink, (A)
is the gap between the ink roller 1 and the printing medium 2. In FIG. 1, an ink roller 1 is connected to a printing medium 2 such as paper and a gap (A
) (preferably about 50μ to 200μ).

There is a movable piece '4 that reciprocates in this gap (A), and this piece is attached to one end of the bimorph 3 (made by gluing two piezoelectric plates together) whose one end is fixed to a fixed base 5.

The movable piece 4 reciprocates between the surface of the ink roller 1, which is rotated by a signal from an electric signal source 6, and the surface of the printing medium 2. A film of liquid ink 8 is always formed on the surface of the ink roller 1 by the ink pot 7. The printing principle will be explained using FIG. Ink roller 1 rotating in the direction of the arrow
The surface of is always covered with a coating 10 of liquid ink 8 due to the liquid ink 8 in the ink fountain 7 contacting one surface. The protrusion 9 of the ink fountain 7 constitutes a knife which limits the thickness of the coating 10 of the liquid ink 8. The movable piece 4 attached to the bimorph 3 is in the position 4a when no voltage is applied to the bimorph 3. When a voltage is applied to the bimorph 3 to bend it toward the ink roller 1, the movable piece 4 comes into contact with the surface of the ink roller 1 as shown in the figure, and since the ink roller 1 is rotating, the liquid ink 8 flows onto the movable piece 4. It rises to the top. Next, when a voltage (opposite polarity) is applied that causes the bimorph 3 to bend toward the printing material 2, the movable piece 4 moves to the position 4b with the liquid ink 8 placed on it, and moves toward the printing material 2. The liquid ink 8 comes into contact with the surface of the printing medium 2, and the liquid ink 8 adheres to the printing medium 2. When the electric signal (voltage) is turned off, the movable piece 4 returns to its original position 4a. If such an operation is repeated in accordance with the electrical signals while moving the printing material 2, a large number of movable pieces that move independently from each other in the direction perpendicular to the surface of the paper can print rows of dots of the liquid ink 8a on the printing material 2. 4, and by driving each with an appropriate electric signal, characters can be printed.

[Specific examples]

Approximately 100 mm on the surface of the ink roller 1 made of aluminum with a diameter of 239 mm.
A film 10 of liquid ink 8 (Kuco offset printing ink) of μ is formed and rotated at 10 revolutions/second, and paper as a printing medium 2 is placed at a position approximately 200 μ apart from the surface of the film 10 of liquid ink 8. I put it on. Next, Bimorph 3 (made by Matsushita Electric Industrial Co., Ltd. PCM86 piezoelectric constant d
, , -200x 10m/N) thickness 10
04m, length 10mm, width 1mm, only the tip is 300mm wide
A stainless steel movable piece 4 that is thinned to μ and processed into a knife shape is attached to the bimorph 3 so that the movable piece 4 is in a position away from the surface of the liquid ink 8 and the surface of the paper when no voltage is applied. The root of the was fixed. While doing so, the paper was moved at a speed of about 200+wm/s and a voltage of +250v was applied for 1+ms, followed by a
When an electrical signal of 0 V for 1 ms was repeatedly applied at 200 Hz, clear dots of about 500 μ x 600 μ were obtained at 1 inch intervals.

Of course, the above is just an example.

For example, although the ink bottle 7 is used for supplying the liquid ink 8, this is merely an example, and a sponge-like object impregnated with the liquid ink 8 may also be used. The liquid ink 8 may be one that is solid at room temperature and becomes liquid when the temperature is raised (thermoplastic ink). In this case, it is necessary to heat the ink roller 1, but there is little dirt after printing.Although we used a piezoelectric bimorph 3 as the drive source for the movable piece 4, it is of course possible to use a coil. be. Further, the number of movable pieces 4 is not limited to one, but it is preferable to use a plurality of pieces.Furthermore, it is only necessary that the printing medium 2 and the ink roller 1 (integrated with the movable piece 4) move relative to each other. It is optional whether the printing body 2 or the ink roller 1 is moved. Furthermore, although no mention was made regarding the color of ink, it goes without saying that various colors can be used, including cyan, magenta, yellow, and black, which are the four primary colors of printing.

Effects of the Invention As described above, according to the present invention, a printing medium is placed with a gap from the circumferential surface of a rotating ink roller whose circumferential surface is coated with liquid ink, and a movable piece that reciprocates within this gap is used to print. Since the liquid ink on the ink roller is attached to the surface of the printing medium for printing, printing can be done with a small amount of force and does not produce noise unlike conventional vuiadot printers.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of the operating principle of a printing method in an embodiment of the present invention, and FIG. 2 is an explanatory diagram of the printing principle.

Claims (1)

[Claims] 1. A printing material is placed with a gap from the circumferential surface of a rotating ink roller with liquid ink applied to the circumferential surface, and a movable piece that reciprocates within this gap is used to remove the liquid on the ink roller. A printing method that prints by applying ink to the surface of the printing material. 2. The printing method according to claim 1, which uses thermoplastic ink as the liquid ink. 3. The printing method according to claim 1 or 2, wherein the movable piece is driven by a piezoelectric bimorph. 4. The printing method according to claim 1 or 2, wherein the movable piece is driven by a coil.