JPS63158274A - Color line printer - Google Patents

Abstract

PURPOSE:To eliminate a large diameter tubular platen and to reduce the thickness and the weight of casing, by constructing the platen with an endless belt being rotated by means of a drive roller and providing a means for securing the tip side of a print sheet to the platen. CONSTITUTION:A print sheet 7 is secured by means of a securing means 9 and rotated three times by means of a platen 1 so as to make a color print, and made of flexible rubber material. The entire circumferential length of platen 1 is set to be longer than the lateral length l of the maximum available sheet. A roller 2 is employed for driving rotation of the platen 1 and driven by means of a step motor, and after ink of respective color is transferred to the sheet 7 side, the sheet 7 secured to said platen 1 is carried accurately every time to the initial position. An auxiliary roller 3 stretches the platen 1 together with the roller 2 so as to apply a constant tensile force onto the platen 1. The diameter of a pair of rollers 2, 3 is suppressed to a short dimension so as to reduce the weight and the thickness of casing without causing color shift.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention transfers ink for each predetermined color simultaneously along the width direction of printing paper, and performs color printing by overlapping the inks of these colors. The invention relates to a color line printer that can

[Conventional technology]

2. Description of the Related Art Conventionally, various color line printers have been proposed that perform color printing by overlapping colors such as yellow (Y), magenta (M), and cyan (C). That is,
This color line printer is equipped with a print head formed across the entire width of the printing paper and an ink ribbon coated with ink of each color. Color printing is performed by transferring and superimposing the images. By the way, 1. Normally, in such a color line printer, in order to transfer the ink of each color to the print paper side, the ink ribbon is, for example, yellow (Y), as shown in FIG.
100 inks of each color such as magenta (M) and cyan (C)
When the ink of each color is transferred to the print paper side by the print head, the length of the ink coated is As the ink ribbon moves by a portion, the print paper side is returned to the initial position (hereinafter referred to as the initial position), that is, to the leading edge side, and the next color ink is transferred again.

However, with this type of color line printer, it is necessary to accurately return the printing paper to the initial position to overlap each color of ink, but with the color line printer configured as above, the printing There was a risk that the printing paper would be misaligned from its initial position due to paper slipping, resulting in color misalignment, etc. Therefore, for example, as shown in FIG. A configuration has been proposed in which the ink is fixed to a cylindrical platen 102 made by a manufacturer, and ink of each color is transferred to the print paper 101 by a print head 103 each time the platen 102 rotates once.

[Problem to be solved]

By the way, a color line printer with this configuration is
Since the sheet-shaped print paper is fixed on the outer peripheral surface of the platen so that at least both ends thereof do not overlap, the length of the outer peripheral surface of the platen is at least the length perpendicular to the width direction of the print paper. It is necessary to ensure that the length is larger than the length in the direction (hereinafter referred to as the lateral direction). Therefore, for example, when using print paper with a large horizontal length, the platen diameter D
' increases, making it difficult to make the casing thinner and lighter.

SUMMARY OF THE INVENTION In view of the above-mentioned conventional drawbacks, it is an object of the present invention to provide a color line printer that can be made lightweight and thin without the risk of color misregistration.

[Means for solving problems]

That is, in this invention, a print sheet fixed on a platen is conveyed in a fixed direction multiple times, the print head performs transfer printing of a predetermined color for each conveyance operation, and the multiple colors are superimposed to perform color printing. In this color line printer, the platen is constituted by an endless belt rotated by a drive roller, and a fixing means for fixing the leading edge side of the printing paper to the platen is provided.

[Effect]

In the color line printer of the present invention, the platen is composed of an endless belt stretched by a pair of rollers, and by narrowing the diameter of the pair of rollers and increasing the relative distance, the length direction dimension can be increased. Even when using large sheets of printing paper, the casing can be made thinner and lighter.

〔Example〕

An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows a color line printer according to the present invention, and this color line printer includes an endless belt-like platen 1, a pair of rollers 2 and 3 that stretch the platen 1, an auto feeder 4, It is equipped with a printing lid 5 and a discharge means 6. In the figure, reference numeral 7 is a printing paper, 8 is a conveyance guide member, and 10 is a casing.

The platen 1 is used to place and fix the printing paper 7 by a fixing means 9 shown in FIG. 2, and to perform color printing by rotating the printing paper 7 three times along a certain direction.
It is made of flexible rubber material or the like. The entire circumferential length of the platen 1 is set to be larger than the lateral length l of the print paper 7 of the maximum size that can be used.

The roller 2 is used to drive the rotation of the platen 1, and is connected to a stamp motor or the like, and after each color ink is transferred to the print paper 7 side, the print paper 7 fixed to the platen 1 is initialized every time. It is designed to be transported to the correct position.

The roller 3 is for auxiliary use, and is designed to stretch the platen 1 together with the roller 2 and apply a certain tension to the platen 1. And these pair of rollers 2
, 3 have a configuration in which the diameter size is kept small in order to make the casing 10 thinner.

The auto feeder 4 is for automatically feeding the print paper 7 to the platen 1 side, and has a feeding roller 4a attached to the bottom of the leading end.

The print head 5 is formed to have a length that is almost the same as the width of the platen 1, as in the conventional type, and transfers each color of ink to the print paper 7 side each time from an ink ribbon housed in an ink ribbon cassette (not shown). It is designed to allow

The ejection means 6 is for ejecting the print paper 7 to the outside after color printing has been performed by transferring ink of each color.
It is composed of a pair of discharge rolls 6a and the like.

Therefore, according to the color line printer according to this embodiment, even if the size of the print paper 7 is large and the length l in the horizontal direction is large, the length l of the platen 1 corresponding to the length l is By separating the small-diameter rollers 2 and 3, the casing lO can be made thinner and lighter.

〔effect〕

As explained above, according to the color line printer according to the present invention, the conveying means for printing paper is constituted by a platen on a belt for overlapping ink of each color, and a large diameter cylindrical Since a platen is not required, the casing can be made thinner and lighter, which greatly improves portability and has a great practical effect.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a color line printer according to the present invention, FIG. 2 is a perspective view showing an ink ribbon used in the color line printer, and FIG. 3 is a block diagram showing a conventional color line printer. 1...Platen, 7...Print paper, 5...Print head, 2...Roller (drive roller). Applicant: NEC Home Electronics Co., Ltd.

Claims (1)

[Claims] 1. The print paper fixed on the platen is conveyed multiple times in a fixed direction, and the print head performs transfer printing of a predetermined color for each conveyance operation, and the multiple colors are superimposed to produce a color image. A color line printer for printing, characterized in that the platen is constituted by an endless belt rotated by a drive roller, and a fixing means for fixing a leading end side of the printing paper to the platen is provided. printer.