JPS6149881A - Multicolor ink ribbon changeover mechanism for printer - Google Patents

Abstract

PURPOSE:To prevent each tone part of a multicolor ink ribbon from being contaminated due to mxing of different colors, by a construction wherein a shield sheet capable of preventing different colors on a multicolor ink ribbon from mixing with each other is provided between the tip of a printing head and the ink ribbon. CONSTITUTION:A ribbon cartridge 3 mounted on a carrier 4 is supported by the multicolor ink ribbon changeover mechanism so that the tip part of the printing head 8 corresponds to a specified position of the multicolor ink ribbon 2, and when a printing action is conducted on a printing surface of a platen 1, the head 8 presses the specified position of the ribbon 2 through the shield sheet 9, thereby printing is made on a printing apper. Therefore, due to the presence of the sheet 9, the tip of the head 8 does not make direct contact with the ribbon 2, so that it is not stained. Accordingly, when printing by setting the head 8 in correspondence with a color at a position different from the above position, the color of the ribbon 2 used in the preceding printing does not mix with the color of the ribbon 2 used in the subsequent printing.

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention is applicable to printing devices such as input/output typewriters of information processing devices and electric typewriters of printing telegraph machines. The present invention relates to a multicolor ink ribbon switching mechanism for a printing device that can prevent this.

[Prior art and its problems]

Conventionally, in a dot impact serial printer equipped with a multicolor ink ribbon switching mechanism, a printing operation is first performed using a specific color zone of the ink ribbon, and then the color zone of the ink ribbon is switched. to perform the printing operation. In this case, the ink color that was used when printing for the first time is attached to the tip of the print head, so when the next time the color zone is switched and the printing operation is performed again, the ink color that was attached to the tip of the print head is Since the ink is transferred to other different color zones, there is a drawback that the colors mix and cause the color tone on the ink ribbon to become smudged.

[“Objective” of the invention]

The present invention provides a film-like shield sheet between the tip of the print head and the multicolor ink ribbon, so that when performing a printing operation, the print head stamps the ink ribbon through the shield sheet. By performing the printing operation without direct contact with the print head, each color of the multicolor ink ribbon is prevented from being smeared with different ink colors due to adhesion of ink colors to the tip of the print head. An object of the present invention is to provide a multicolor ink ribbon switching mechanism for a printing device capable of performing color printing.

[Structure of the invention]

For this purpose, the mechanism of the present invention is to perform printing by pressing a print head against a platen through an ink ribbon and paper, and the ink ribbon has a plurality of different color zones, which are appropriately different for the print head. A multicolor ink ribbon switching mechanism for a printing device that switches colors to correspond to each other, and a vine shield sheet is provided between the print head tip and the multicolor ink ribbon to prevent different colors from being mixed in the multicolor ink ribbon. It's something.

[Embodiments of the invention]

Next, one embodiment will be described with reference to the drawings.

FIG. 1 is a perspective view of a printing device to which an embodiment of the multicolor ink ribbon switching mechanism of the printing device according to the present invention is applied, FIG. 2 is a side view thereof, and FIG. 3 is a side view of the main parts thereof. be.

In the figure, a ribbon cartridge 3 that accommodates multicolor ink ribbons 2 of four colors has support shafts 3a and 3b on both sides thereof.
It is rotatably held by the support plate 5 of the carrier 4 via the support plate 5 of the carrier 4.

The carrier 4 carrying the 11 cartridge 3 and the print head 8 reciprocates from side to side while performing a printing operation along the platen 1 by means of a guide shaft 6.7.

The carrier 4 has a structure composed of a print head 8, a ribbon cartridge 3 that accommodates a shield sheet 9 and a multicolor ink ribbon 2 colored in four colors, and a ribbon switching mechanism (not shown). As the shield sheet 9, an ultra-thin film is used that has wear resistance and does not allow ink to easily adhere to the surface.

Next, the operation of the dot impact printer device having multicolor ink ribbon switching configured as described above will be explained.

As shown in FIG. 1, the ribbon cartridge 3 mounted on the carrier 4 is held by a multicolor switching mechanism (not shown) so as to correspond to a specific position of the multicolor ink ribbon 2 at the tip of the print head 9. When performing a printing operation on the printing surface of the platen 1, the print head 8 presses a specific position of the multicolor ink ribbon 2 through the shield sheet 9 and prints the printing paper (not shown) wound around the platen 1, as shown in FIG. ). Therefore, the tip of the print head 8 does not come into direct contact with the multicolor ink ribbon 2 due to the presence of the shield sheet 9, so that the tip of the print head 8 is not contaminated with ink.

Next, when the ribbon cartridge 3 is swung around the support shafts 3a, 3b of the ribbon cartridge 3 by a multi-color switching mechanism (not shown) in the direction of arrow B or C in FIG. Print head 8 during printing operation
This corresponds to a position different from the position of the multicolor ink ribbon 2 corresponding to . Similarly to the above case, when the print head 8 presses a specific position of the multicolor ink ribbon 2 through the shield sheet 9 to perform a printing operation, the color of the first multicolor ink ribbon 2 is changed to the color of the later multicolor ink ribbon. It is possible to prevent the color from being mixed into two colors.

〔Effect of the invention〕

As explained above, according to the present invention, by providing a film-like shield sheet between the print head tip and the multicolor ink ribbon, when performing a printing operation, the print head stamps the ink ribbon through the shield sheet. Therefore, the print head itself performs the printing operation without making direct contact with the ink ribbon, so each color of the multicolor ink ribbon may be mixed with different ink colors and smeared due to ink colors adhering to the print head tip. This has the effect of preventing color printing and making it possible to print in beautiful colors.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a printing device to which an embodiment of the multicolor ink ribbon switching mechanism of the printing device according to the present invention is applied, FIG. 2 is a side view thereof, and FIG. 3 is a side view of the main parts thereof. 0 1...Platen 2...Multicolor ink ribbon 3...Ribbon cartridge 3a, 3b...
Support shaft 4...Carrier 5...Support plate 6.
7... Guide shaft 8... Print head 9.
・Shield sheet

Claims (1)

[Claims] A printing device that performs printing by pressing a print head against a platen via an ink ribbon and paper, and the ink ribbon has a plurality of different color zones, and can appropriately switch between different colors to correspond to the print head. A multicolor printing device characterized in that the multicolor ink ribbon switching mechanism is provided with a shield sheet between the print head tip and the multicolor ink ribbon to prevent different colors of the multicolor ink ribbon from being mixed. Ink ribbon switching mechanism.