DE2502231C3 - Mosaic printing device with printing wires arranged like a grid over a surface - Google Patents

Description

The invention relates to a mosaic printing device with a grid-like arrangement over a surface Printing wires which can be moved in the direction of the recording medium for printing by actuating magnets are, with relative movements in two coordinate directions between the recording medium and printing wires are executed.

Printing devices belonging to the genus mosaic printer have already become known. .. Thus, a printing apparatus having Aufzcichnungs - "create some previously known, in which a ^{balkenförmigcr:} Printhead ^r a number of mutually regularly and parallel to each other arranged, relatively short recording pens containing respectively connected to the armature of an electromagnet, the beam-shaped guide element of this device is in arranged displaceably in one direction, the recording sheet also being displaceable, but transversely to the direction of movement of the guide element. This distinguishes the device from the subject matter of the present application which also need printing pins and recording media

ίο in different directions of movement relative to each other be moved. The movement of the print pins even takes place in two directions, which means there are unavoidable tolerances that can even triple. For production of The method is not suitable for fine drawings. In another device for printing characters the character carrier is printed on both sides, this being driven by a drive device between the is moved through both printing devices. at

In the described arrangement there is a risk of damage to the character carrier, since the printing devices are not assigned counterholders.

The invention is based on the object of a fast mosaic printer for producing records to create a high dimensional accuracy over the entire surface of the recording medium with regard to the distances between the individual pressure points and where in particular any slip between individual characters and columns is avoided during the printing process. Based on the known printers in which printing wires are arranged in a grid-like manner. Holes having plate are axially displaceable, the aforementioned object is according to the invention solved in that the pressure wires with their actuating magnets on a rigidly arranged Disc located the same size as the recording medium and at the same intervals are distributed over the entire disk, and that the relative movement through the record carrier supporting base is carried out.

In a further embodiment of the invention, the movement of the base with the character carrier takes place with the aid of a stepper motor, so that each printing wire can approach within the grid field assigned to it in two dimensions, each with 2 ^ς /, rushes with 25 points each. In addition, the plates receiving the printing wires are arranged on both sides of the character carrier, the facing surfaces of the plates having waffle-like surfaces with mutually opposite elevations and depressions as a base for the corresponding printing wire. Each pressure wire stored in the plate is designed as an armature of a coil for generating an electromagnetic field, which can be pressed against the pad having ink ribbon and character carrier in the case of current flow in the coil, overcoming the force of a return spring.

In addition to the main advantage achieved with the invention, both a text and a drawing or both together on one sheet in a short time ϋΛ being able to print out for about 6 to 8 seconds, another advantage is that the text and / '

^65:; or the drawing can be transferred to a character carrier made of normal, plain paper. Another advantage is that the files are archived on the memory

Drawings can be marked at any time in a matter of seconds. The pixels need not to be transferred onto tracing paper or film and then reproduced instead, the pixels are immediately transferred to a simple sheet of paper. This process can be repeated any number of times, so that the use of a pause machine or a reproduction machine can be dispensed with. In addition, the character carrier can except on its front can also be printed with pixels on its back at the same time, if instead of the base a second plate provided with pressure wires and arranged under the sign carrier is used is and the character carrier between the two plat- ι ϊ ten is movable.

The invention is illustrated by way of example and schematically with reference to the drawing and is described below described in more detail. It shows

Fig. 1 the device in a side view, Fig. 2 the same device in a plan view,

3 shows a cross-section along the line AB of FIG. 2 on a greatly enlarged scale,

4 shows a cross-section along the line AB of FIG. 2 on a greatly enlarged scale, with a second plate being arranged below the character carrier instead of the base.

The device consists, for example, essentially of the plate 1, in which a grid-like arrangement Holes 2 for receiving printing wires 3 are introduced, the base 4 on which the character carrier 5, which can preferably consist of normal paper, is stretched, and the drive for the base 4. which consists, for example, of a stepper motor 6 with the associated gear. Between the character carrier 5 and the plate 1 there is a rollable ribbon 7 against which the pressure wire 3 can be pressed.

In the case of an arrangement of the plate 1 receiving the printing wires 3 on both sides of the character carrier 5 wptst each plate 1 one evenly as reciprocal support for the character carrier 5 serving waffle-like surface 15 (Fig. 4). In this In this case, the character carrier 5 itself is moved between the plates 1 via a clamping frame, for example.

The holes 2 arranged in the plate 1 for receiving the printing wires 3 are evenly spaced one behind the other in a row, while the plate 1 has several rows of holes next to one another, the spacing of which corresponds to the spacing of the holes in a row. The over the entire plate 1 evenly ver ^f hurried holes 2 between each include four holes each time a grid 8 a, which for illustration in F i g. 2 is shown hatched. The distance between the holes is kept as small as possible, and for technical reasons (space required for printing pins and their actuation mechanism) it is, for example, 5 mm. This corresponds to the edge length of each square grid 8. Each grid 8 istiin smallest dots with 0.2 mm spacing divided from each other. "In a grid 8 of 5 mm edge length are then obtained 25 lines per 25 points, both the distance the points within a line and the line spacing itself is 0.2 mm. Each grid field 8 therefore has a total of 625 points 8 is to blacken completely, is actuated 625 times. So that the dots are not hammered 625 times on the same place, either the printing wire 3 must be moved step by step from point to point in a line and line by line in the grid field 8 over the fixed character carrier 5, or the The character carrier 5 clamped on the base 4 executes a corresponding movement under the stationary printing wire 3.

The printing wire 3 itself can be pressed against the base 4 via the ink ribbon 7 and the character carrier 5, in that the printing wire 3, which is made of a non-magnetic material, is connected to an iron sleeve forming the armature 9 arranged, the pressure ^ iaht 3 surrounding coil 10 is attracted against the force of a return spring 11 when the coil 10 is traversed by a current. Upon interruption of the current lusses ^f in the coil 10, the print wire 3 by the Ruckhc; ieder 11 is raised from the base 4, the indicia carrier 5 and the ink ribbon 7 and, for example, pressed against a connected to the plate 1 stopper plate 12 (Fig. 3) .

The plate 1 and the base 4 are expediently as large as the corresponding format of the Sheet to be provided with text or a drawing. As a ribbon next to a normal black tape can also be used with a different colored tape; so can such special tapes are used, with which, for example, grease marks on foils for offset printing can be attached. This is the step of making a suitable print media saved by a film process. After the grease marks on the film surface have been stripped off, the Foil itself can be reused.

Any characters can be applied to the character carrier during the printing process, see above that the production of previous imprints, such as company header, borders, tabular Classifications and so on that can be omitted from the character carrier.

List of reference symbols

1 plate

2 holes

3 pressure wire
Λ pad

5 recording media

6 stepper motor

7 ribbon

8 grid

9 anchors

10 coil

11 return spring

12 stop plate

13 waffle-like surface

For this purpose 2 BIaU drawings

Claims (4)

Patent claims: 1. Mosaic printing device with printing wires arranged in a grid-like manner over a surface, which are used for Imprint can be moved in the direction of the recording medium by actuating magnets, wherein Relative movements in two coordinate directions between the recording medium and printing wires are carried out that correspond to the distance of two each in the corresponding coordinate direction spaced printing wires, characterized in that the printing wires (3) with their actuating magnets on a rigidly arranged plate (1) which is the same size as the recording medium (5), and are distributed at equal intervals over the entire plate (1), and that the relative movement is carried out by the support (4) carrying the recording medium (5). 2. mosaic printing device according to claim 1, characterized in that the movement of the substrate (4) with the recording medium (5) with the help of a stepping motor (6) is carried out so that each printing wire (3) is within its assigned Grid field (8) can approach 25 lines with 25 points each in two dimensions. 3. mosaic printing device according to claims 1 and 2, characterized in that the Plates (1) receiving printing wires (3) are arranged on both sides of the recording medium (5) are, the mutually facing surfaces of the plates (1) each have a waffle-like surface (15) with mutually / alternately opposite elevations and depressions as a base (4) for the corresponding printing wire (3). 4. mosaic printing device according to claims 1 to 3, characterized in that each in the plate (1) stored pressure wire (3) as an anchor (9) of a coil (10) for generating an electromagnetic Field is formed, which in the event of a current flow in the coil (10) is overcome the force of a return spring (11) against the ink ribbon (7) and recording medium (5) having pad (4) can be pressed.