JPS61284469A - Printing head moving type printing apparatus - Google Patents

Abstract

PURPOSE:To make it possible to perform accurate printing by holding the printing part of printing paper to a flat state, by making printing paper movable at the objective moving position of a printing head at the time of the movement of said head while pressing the printing paper. CONSTITUTION:A pair of pressing means 4a, 4b pivotally supported at one ends thereof in a freely revolvable manner are provided above a printing body 1 and pressing bodies 5 each having a shape bent in a circular arc state are integrally provided to the lower ends of said pressing means 4a, 4b and the lower surfaces of the pressing parts 5 are slid with the upper surface of printing paper 6 in a freely slidable manner. When a printing head 2 moves to the direction shown by an arrow A, the pressing means 4a is held to the right side position of the printing head 2 and held to the left side position of said printing head 2 when the printing head 2 moves to the direction by an arrow B. Therefore, when the printing head 2 moves to the direction shown by the arrow A, the pressing means 4b is revolved to a position upwardly escaped and, contrarily, when the printing head 2 moves o the direction shown by the arrow B, the pressing means 4b is lowered downwardly to be slid with the printing paper 6 and the pressing means 4a moves upwardly. By this method, the interval between the printing head and the printing paper at the time of printing can be always kept constant and a printing error can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION a. Field of Industrial Application The present invention relates to a moving print head type printing device, and particularly to a printing device that prints using a movable print head that is held in a non-contact state with respect to printing paper. This invention relates to a novel improvement for performing giomo in a configuration in which the present invention is performed.

b. Conventional technology Conventionally, in the case of a configuration in which printing is performed using a print head that is held in a non-contact state on the printing paper used, in the case of small paper, it is held by wrapping it around a platen. or placed on a flat platen.

C0 Problems to be Solved by the Invention However, in the conventional configuration described above, printing is performed by ejecting ink while moving the print head in a so-called non-contact state, which is located 0.2 m from the printing paper. In some cases, the paper may twist upward, resulting in some straight lines being printed in a curved shape or some circles being printed in a distorted shape.

Means for Solving the d0 Problem The present invention aims to provide extremely effective means for quickly eliminating the above-mentioned drawbacks, and this invention is intended to achieve this purpose. The gist of the invention is to provide a moving print head type printing device that performs printing using a movable print head held in a non-contact state with respect to printing paper, which includes a pressing means for pressing the printing paper. , a print head moving type printing device having a configuration in which the pressing means is movably disposed at a position ahead of the print head while pressing the print paper when the print head moves.

In a configuration with 10 or more actions, when the print head is moved, the pressing means moves together with the print head onto the print paper at a position ahead of the print head in the direction of movement of the print head, and always presses the bottom or top of the print head. The printed portion of the printing paper corresponding to the above is kept flat, and straight lines, curves, and colors during color printing can be printed accurately.

f. Embodiments Hereinafter, preferred embodiments of the moving print head printing apparatus according to the present invention will be described in detail with reference to the drawings.

What is indicated by the reference numeral 1 in the drawings is a printed body having an almost box-shape as a whole, and a print head 2 consisting of a thermal head is provided at the bottom of this printed body 1, and this print head 2 has a printing section. 3 is formed and is composed of a large number of dot elements (not shown).

A pair of pressing means 4a, 4b are provided on the upper part of the printed body 1, one end of which is rotatably supported, and the lower end of each pressing means 4a, 4b has an arcuate shape. A presser portion 5 is integrally formed, and the lower surface of the presser portion 5 is in slidable contact with the upper surface of the printing paper 6.

Each of the holding means 4a and 4b is configured to be rotatable, and when the print head 2 of the printed body 1 moves in the direction of arrow A, the holding means 4a is held at the right position of the print head 2. , when the cover 2 moves in the direction of arrow B to print on the print body 1, it is configured to be held at a position to the left of the print head 2. Therefore, the print head 2 is
When the print head 2 is moved in the direction of
When the paper moves in the direction of arrow B, the presser means 4b moves downward and comes into sliding contact with the printing paper 6, and the presser means 4a moves upward.

In this embodiment, a case has been described in which the structure is constructed using two pressing means 4a and 4b, but the same effect can be achieved even when the structure is constructed using one pressing means.

Furthermore, a pair of ink cassettes 7.8 are arranged at both ends of the printed body 1, each ink cassette 7.8 stores ink 9, and a roller 10 is provided. On each of these rollers 1°, an ink holding film 11 for holding ink 9 is movably provided by being wound around guides 7a, 8a and blades 7b, 8b made of rubber. 11 is in sliding contact with the surface of the printing portion 3 of the print head 2.

The printing configuration using a print head consisting of the ink retaining film 11 and a thermal head was developed by the present applicant and filed in September 1980. A number of holes or recesses 11 with a diameter. a is formed, and each hole or recess 11
When the ink 9 stored in the ink 9 is used for printing by the thermal head, bubbles are generated by the heat generated from the printing section 3 of the rad 2, and the ink 9 is ejected to the outside due to the pressure of the bubbles, and printing is performed.

As for the print head 2, it is preferable to use an inkjet head having the above-mentioned configuration, but similar effects can be obtained by using an inkjet head using a conventionally known piezoelectric nozzle.

Further, the printing paper 6 is placed on a vacuum-type suction body 13 having a large number of suction holes 12, and is suctioned and placed flat on the base portion 13a of the suction body 13.

In the above configuration, when the printing head 2 is moved together with the printing body 1 and printing is performed on the printing paper 6, the pressing portions of the pressing means 4a and 4b are always at the forward position in the advancing direction of the printing pad 2. is held and presses the printing paper 6 while slidingly contacting it, so printing is performed while the printing paper 6 is always placed flat on the stand 13a of the suction body 13.

In this embodiment, the printing head 2 and the holding means 4a, 4b are attached to the printing body 1, and the printing head 2 and the holding means 4a, 4b are configured so that they can be moved at the same time. It can be effective.

g1 Effects of the Invention Since the print head moving type printing device according to the present invention has the above-described configuration and operation, it is possible to always maintain a constant distance between the print head and the printing paper during printing, and the printing You can prevent mistakes.

In addition, since the printing paper is held down by the pressing means, the printing surface of the printing paper is always kept flat, making it possible to perform reliable printing, and in particular, to prevent color misalignment in the case of color printing.
Color unevenness etc. can be prevented.

[Brief explanation of drawings]

The drawings are for illustrating a moving print head type printing apparatus according to the present invention, and FIG. 1 is a block diagram showing the overall general structure, and FIG. 2 is an enlarged bottom view showing the main part of FIG. 1. 1 is a print body, 2 is a print head, 3 is a print part, 4a, 4b
1 is a pressing means, 5 is a pressing portion, 6 is printing paper, 7.8 is an ink cassette, 9 is ink, 10 is a roller, 11 is an ink holding film, and 13 is a suction body. that's all

Claims (5)

[Claims] (1) A moving print head printing device that performs printing using a movable print head held in a non-contact state with respect to printing paper, comprising a pressing means for pressing the printing paper; 2. A moving print head type printing device, characterized in that said pressing means is movably disposed at a position ahead of said print head while pressing said print paper when said print head is moved. (2) The print head moving type printing device according to claim 1, wherein the print head is disposed above the printing paper. (3) The print head is provided so as to be movable in both directions, and the pressing means is provided so as to be able to change its position depending on the direction of movement of the print head. The moving print head type printing device according to item 1 or 2. (4) The print head is comprised of a thermal head that applies heat to an ink holding film having a large number of ink storage holes or recesses. 3. The moving print head type printing device according to item 3. (5) Item 1 or 2 or 3, wherein the printing paper is adsorbed by a vacuum type paper adsorption member.
The moving print head type printing device according to item 1 or 4.