SU1729805A1 - Multicolored printer - Google Patents

Abstract

This invention relates to automatic printing devices and allows for increased speed and reliability. The friction drive of the tape drive is mounted on a supporting element made of a cylindrical shape, and on the disk there are fixation elements that interact with the lock installed on the carriage. 1 hp ff, 1 ill.

Description

This invention relates to automatic drum type printers used in a computer for outputting information on paper or other storage media.

The aim of the invention is to simplify the design, increase the speed and reliability of the printing device.

This goal is achieved by the fact that to switch the ink ribbon to the desired color, a drive of the supporting shaft is used, for which the drive friction disk made of an elastic friction material, interacting with tape drive at the extreme (initial) position of the carriage with a print head, is located on its axis. The tape drive mounted on the nose of the print head or on the carriage is equipped with a mechanism that fixes the position of the ink ribbon relative to the printing elements.

The drawing schematically shows a printing apparatus for multi-color printing.

The device comprises a shaft 1 with printing paper 2, a printing head 3 mounted on a carriage 4 moving on

guides 5 and 6 parallel to the paper shaft 1.

On the nose part 7 of the print head 3 or on the carriage, there is a hinged ribbon driver 8 having —double-shaped lateral surfaces connected by a jumper made in the form of a hollow half-cylinder, the disc-shaped lateral surfaces of the ribbon carrier having arched slots through which the ink ribbon 9 passes and the semi-cylindrical web of the ribbon driver in the central part has a vertical slot (slot) through which the printing needles have access to the surface of the printing paper 2.

Tape feeder 8 freely rotates around an axis perpendicular to the axis of the printhead. On one of the disc-shaped side surfaces of the ribbon carrier (on the left in Fig. 1) in the front part, grooves are made along the outer surface arc for better adhesion with the surface of the driving friction disk 10, and a gear segment interacting with a spring retainer 11 is made on the back side. The ink ribbon 9 is supported by guide rollers 12 and

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placed in a cassette 13 mounted on the side walls of the casing of the printing device.

The printing device operates as follows.

The print head is mounted on the carriage, together with it it makes a reciprocating movement along the paper support shaft, in which the printing elements apply signs to the printed paper through the ink ribbon.

The color switching of the dye ribbon (for example, four-color, with the possibility of obtaining a greater number of colors by superimposing two colors on one line when the carriage is repeated forward or backward) is performed in one of the extreme positions (in Fig. 1, left position) of the carriage, which the tape feeder 8 with the front part of the left disc-shaped lateral surface interacts with the driving friction disk 10, rigidly fixed on the axis of the supporting shaft, driven by a stepper motor, which, according to a given program, turns Tape feeder around its axis, raising or lowering (in an arc) the dye tape and thereby approaching the printing elements of the dye tape of the required color.

When transferring the ink ribbon, the paper is displaced, therefore, after the ribbon has been transferred to the desired color, the carriage is shifted to the beginning of the line, and the paper is returned to its original position by turning the paper supporting shaft.

In the proposed device, there are no additional elements in the electronic circuit, since the carriage drive and the drive shaft drive, which are present in the printing device, are used for color rendering, which reduces its material consumption, size and cost.

In addition, in the proposed printing device, the carriage does not carry the stepper motor with the transmission mechanism of rotation of the ribbon driver, as in the prototype, which reduces the load on the rubbing surfaces and increases their wear resistance. The device opens up the possibility of many serial printers through minor modifications translate from single-color to multi-color.

Claims (2)

Invention Formula 1, A printing device for multi-color printing, containing a supporting plate mounted in the housing, a movable carriage mounted on rails parallel to the axis of the supporting element, placed on the printhead carriage with a tape drive mounted rotatably when interacting with the driving element of the drive, characterized by that, in order to increase speed and reliability, the support element is cylindrical and hinged in the housing, the driving element is designed as The riction disk is mounted on the shaft of the supporting element, and the carriage is equipped with a latch installed with the possibility of interaction with the fixing elements made on the friction disk, the number of which is not less than the number of color bars on the ribbon. 2. Pop 1 device, characterized in that the interacting surfaces of the ribbon carrier and the friction disk are made conical, at least one of the surfaces is made of elastic material and has corrugations.