DE1249570B - Device for writing wire guidance in wire printers - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. CL:

German KL:

Number:
File number:
Registration date:
Display day:

G06k

B41J Ä

42 m 6-15 / 10

J 26210IX c / 42 m6

July 15, 1964

7th September 1967

The invention relates to a device for guiding the writing wire with wire printers, where the individual writing wires are preferably in rows in Write head arranged guide channels are movably mounted in their longitudinal axis.

In the case of wire printers, the characters at the printing point are made up of small elements, preferably Points, formed. So there is no desired, finished character in the writing area instead, from the writing elements arranged in the form of a matrix, those are always selected from which the character is to be composed. According to the arrangement of the elements, that is preferably the writing wires, a distinction is essentially made between two types of wire printer. Once is a series of elements above the font arranged distributed. The writing paper or the printing unit become uniform in the line direction postponed. The typeface is created by the interaction of the selection of appropriate writing wires with the correct timing. In the other type, all are for one character required writing wires are selected at once and the imprint is made for the entire character once. The individual writing wires are stored in guide holes or tubes in the writing head which they face when printing in the direction of the printable Paper can be moved.

In a known printer, the characters are built up from a grid of 5X7 elements. So there are 35 fine wires in a letter-sized rectangle at each writing point arranged. The wires required for printing a character are used when setting pushed a little forward out of the print head, whereupon the whole print head against the ribbon and the paper is pressed. The writing wires have as a result of the small diameter little stiffness. For this reason, the guidance of the writing wires in the writing head must be special To be valued. At low writing speeds, how to do it with the usual electromechanical or electromagnetic setting the writing wires achieved, no special requirements are placed on the guides.

But so-called magnetostrictive printers have become known in which the relatively slow setting of the writing wires to electromechanical! or electromagnetic path is avoided in that the individual writing wires, via the magnetostriction effect, contribute to longitudinal vibrations in the sonic or ultrasound area, a device for guiding the writing wire
Wire printers

Applicant:

IBM Germany International Office Machines

Society m. B. H.,

Sindelfingen, Tübinger Allee 49

Named as inventor:
Max Preisinger, Darmsheim

stimulated and thereby brought to the impression. Because in this case the writing wires are very short Need time to swing in and take off,

ao very high writing speeds are achieved. The high writing wire speed and number of load cycles achieved here during the vibration process place much greater demands on the management of the writing wires. The well-known guide channels, which consist of bores in the writing head or pipes arranged in it, have to be something have a larger diameter than that of the writing wires, since there are no unnecessary ones due to the guide channels Attenuation of the longitudinal movement of the writing wires is to be caused. Since also the thin If the writing wires are never completely straight, they lay at a specific but random point on the guide channels. Due to the rapid movement of the writing wires Large amounts of material are removed at these points after a short period of operation. As a result each guide channel expands in any direction. The irregular emigration of the individual writing wires causes the typeface to be irregular and illegible in a short time.

Such a write head has a correspondingly short service life or the writing speed must be reduced unnecessarily far. The emigration of the writing wire in one direction ^; tion also increases wire wear and can also lead to the writing wire being seized. The material dust that occurs as a result of abrasion can also contribute to further disruptions in printing operations.

: The shortcomings mentioned here of the known Guide channels are enlarged by the fact that the writing wires vibrate longitudinally uncontrollable transverse vibrations

709 640/253

.step. Since one also as a result of having magnetostrictive Printers attainable high writing speed has gone over to the characters To print step by step, the load on the guide channels or the writing wires is increased again enlarged, so that the disadvantages mentioned are even more significant here. The reason for this is that at step-by-step printing of the characters only one, for example, one column of the font metrix assigned

union is connected parallel to the pen row arranged circuit board.

This arrangement can be further improved in that the circuit board is parallel to 5 each guide channel · one the electric field lines having concentrating rib. -

Further details emerge from the description made with reference to FIGS. 1 to 12. In the Figures 1 to 7, 11 and 12 are in plan view

nete row of writing wires is used and only the area of the writing head is shown in each case. each other according to the number of columns that the pens through during the printing process Scripture matrix is excited. the guide channels emerge from the write head.

The aim of the invention is to improve the loading

known writing wire guides with fast wire Fig. 8 to 10 is schematically only a single printer. The disadvantages mentioned should be drawn out if possible 15 ner pen or guide channel, should be avoided, in particular the wear and tear. 1 of the following

Tongue phenomena are significantly reduced as part of the writing head referred to as the pressure plate 1 and the emigration of the writing wires shown where the guide channels2 are located, despite everything in a certain regularity. The pens are missing in this figure. Because only be brought so that a series of guide channels 2 is provided even after a long period of operation, a flawless typeface is generated over the long term. in the example under consideration it is one

According to the invention, therefore, there is a wire-line printer in which the character creation step taken for writing wire routing with wire printers. To a character! for printing too beaten, which is designed in such a way that the individual must bring, according to the assumed here Writing wires through at right angles to the direction of movement 25 NEN 5X7 writing matrix, the writing wires in five forces acting on corresponding areas of the wan steps can be selected. As in the conditions of the guide channels are created. The introduction to the writing carried out, it should be in the be-This The device causes the expansion of the sought-after example to include a magnetostrictive wire guide channels act as a result of signs of wear and tear, as the vibrations achieved here always takes place in the same direction and thus the advantages of the device described are of particular importance even if the typing speed is high and long. In Fig. 2 are the Operating time a clean typeface is maintained. Writing wires 3 inserted into the guide channels 2. At the same time, the diameter of the guide channels 2 is somewhat desired transverse vibrations of the writing greater than the diameter of the writing wires attenuated and thereby the extent of the wires 3. This measure is necessary so that the Signs of use per se are significantly reduced. Vibration of the writing wires 3 due to friction This makes the device particularly advantageous - it is not dampened too much in the guide channel 2, liable that the forces by magnetic or electro- From Fig. 2 it can also be seen that the static fields are generated. Writing wires 3 as a result of their necessarily very much A useful embodiment of the device 4 ° small cross-section are not completely straight. There is in the fact that the forces are only applied to certain, half of each writing wire lies arbitrarily on one side critical points along the guide channels exerted on the guide channel.

especially at the exit points of the In F i g. 3 are the guide channels 2 and the location

Writing wires on the print head. of the pens 3 after some operating time of the wire

An advantageous arrangement results from 45 printer recording. According to the in Fig. 2 that along the individual guide channels, individual or arbitrary positions of the writing wires 2 several, the writing wires attracting or removing the guide channels 3 in FIG. 3 after the offending, Magnetic poles configured in this way are arranged in a wide variety of directions. These are north, It goes without saying that the writing wires are always subject to wear and tear during operation Increasing expansion of the guide channels is always available in 50 and can only be achieved through special selection be deflected in the same direction. of the material for the printing plate 1, in which the

Guide channels are located, are favorably influenced. But from FIG. 3 it can be seen that the initial arbitrary position of the writing wires 3 of the 55 largest possible horizontal distance T between two writing wires 3 has become extremely large. It can also be seen that due to the very small mutual spacing of the individual guide channels it can very soon happen that individual

A particularly simple arrangement is to have 60 writing wires up to the neighboring guide wire a single plate-shaped permanent magnet worked through a parallel channel and then to an end-parallel one lead to a series of guide channels arranged failure of the printer. Such a one net is. Guiding the writing wires has at least the consequence

A further advantageous arrangement consists in the fact that the typeface produced becomes illegible, that the guide channels are made of non-conductive material 65 F i g. FIG. 4 now shows an arrangement in which are limited and the electrically connected in parallel of FIG. 3, the operating time of the largest pen grater at one pole of a voltage source, the possible distance T between two writing wires 3, is neglected, while the opposite pole at one pole has remained substantially small. In addition, the

In particular, the arrangement can be made so that the guide channels in the desired and have longitudinal slots predetermined by the magnet expansion direction.

The arrangement can also be such that the magnetic poles are combined to form a plate which essentially has a rib concentrating the magnetic field lines parallel to each guide channel.

Distance between adjacent writing wires only changed insignificantly. This state is achieved by a permanent magnet 4, which is used to determine the direction the wear parallel to the row of writing wires 3 or guide channels 2 arranged has been. Due to the magnetic pole assigned to each guide channel or writing wire, all Writing wires deflected in the same direction. By suitably designing the individual guide channels nearby poles of the magnet is ensured that the deflection direction is also at . is retained for a longer period of operation. From FIG. 4 it can be seen that even with a long operating time and high writing speed a clean typeface is maintained. Because by suitable arrangement the individual guide channels can also avoid disruptive transverse vibrations, also the absolute wear and tear, i.e. H. Expansion of the guide channels 2, significantly reduced! In Fig. 8th 9 and 9 are simplified and in perspective for clarity a writing wire 3 and the design of the associated magnets 4 are shown. Of course one or more magnets can be arranged in the longitudinal direction of the writing wires. Also can in the case of several magnets, both the polarity and the field strength and thus the one on the writing wire The force exerted can be adapted to the requirements.

Fig. 10 shows the generation of the required field by electromagnetic means by means of Coils 5 and the core 6.

As in Fig. 5 can be used with lower requirements for writing speed or service life the technical progress aimed at by the invention also through a simple magnetic one Plate 7 can be achieved, which is arranged parallel to the row of guide channels 2. This record is preferably magnetized laterally and with the finest pole pitch. The dividing lines between the poles parallel to the in F i g. 5 to 7 are views shown.

The embodiment according to FIG. 6 shows how, in addition to the enclosed magnetic disk 7, the direction of expansion the guide channels 2 can be defined by longitudinal slots 8.

Another embodiment is shown in FIG. 7 shown. Here the guide channels 2 are on the edge the printing plate 1 arranged. Between the enclosed magnetic plate 7 and the guide channels 2 there is an intermediate layer made of non-magnetic material 9. Since in this case the The attraction forces of the magnet 7 on the writing wires 3 are significantly reduced by the intermediate layer are located in this intermediate layer 9 * slots 8, which serve as target wear points and thus determine the direction of expansion.

FIG. 11 shows an arrangement in which electrostatic fields or those linked to them Forces to determine the direction of expansion of the guide channels 2 are used. The guide channels 2 are here in a pressure plate 1 made of non-conductive material. The pens 3 themselves are made of electrically conductive material and are all electrically conductive to one another tied together. At the points where a force is to be exerted on the pens 3 is parallel an electrically conductive plate 10 is arranged in relation to the guide channels 2. Now it's time for the pens 3 one pole and placed on the conductive plate 10 the other pole of a voltage source, so that on all The same force is exerted on writing pens in the same direction, and thereby the pens are each applied to the same point of the guide channels 2. In this case, too, the plate bears

10 ribs which are suitably shaped for the clear determination of the direction of force and which form the field lines between Bundle pens and plate. It should be noted that the individual pens 3 by their

ίο with the same polarity exert forces that repel one another. However, these forces cancel each other out almost completely in the case of the pens on the inside they are directed opposite here. Since the two outer pens, shown in FIG. 11 the top one and the lowest, in one direction have no neighboring pen, affects this apart from the intended one Force in the horizontal direction an additional Force perpendicular to it. If this force effect is not negligible, it can be done in a simple manner

ao by changing or moving the ribs associated with these writing wires, these unwanted Force effect can be compensated.

For the sake of completeness, FIG. 12 shows a Recorded printing plate 11 of a wire printer, which the characters not step by step, but in prints in one cycle. In the printing plate

11 there are accordingly as many pens or guide channels as there are possible pressure points available. The arrangement of the writing wires results in a true representation of the writing matrix. The writing plate 11 in turn consists of a non-conductive material.

Conductive plates 12 are inserted between the individual columns parallel to the guide channels All pens in a column are connected to one another in an electrically conductive manner. The plates 12 and the rows of pens are now alternately polarized so that, for example, on each pen 3 one Split the plate arranged to the left of it into a repelling plate and the plate arranged to the right of it exerts an attractive force. From this it can be seen that the same force is applied to all pens horizontal direction to the right is exercised. Even after a long period of operation and the associated Expansion of the guide holes 2, the original typeface is retained because the mutual Position of the writing wires 3 remains almost unchanged.

Claims (9)

Patent claims: 1. Device for writing wire guidance in wire printers, in which the individual writing wires in guide channels preferably arranged in rows in the write head in their The longitudinal axis are movably mounted, characterized in that the individual writing wires (3) run through transversely to the direction of movement acting forces applied to corresponding areas of the walls of the guide channels (2) will. 2. Device according to claim 1, characterized in that the forces are magnetic or electrostatic fields are generated. 3. Device according to claim 1, characterized in that the forces are only applied to certain critical points are exercised along the guide channels (2), in particular at the exit points of the writing wires (3) or guide channels (2) on the writing head. 4. Device according to claim 1, characterized in that along the individual guide channels (2) one or more of the writing wires (3) attractive or repulsive magnetic poles configured in such a way are arranged that the writing wires (3) always when the expansion of the guide channels (2) occurs during operation be deflected in the same direction. 5. Device according to claim 4, characterized in that the guide channels (2) in their -Longitudinal axis in the desired direction of expansion given by the magnet, longitudinal slots (8) have. 6. Device according to claim 4, characterized that the magnetic poles (4) are combined to form a plate which is essentially parallel has a rib concentrating the magnetic field lines for each guide channel (2). 7. Device according to claim 4, characterized in that a single plate-shaped Permanent magnet (7) is arranged parallel to a series of guide channels (2). 8. Device according to claim 1, characterized in that that the guide channels (2) are limited by non-conductive material and the electrically parallel-connected pen row is placed on one pole of a voltage source, while the opposite pole to a printed circuit board arranged essentially parallel to the row of pens (10) is connected. 9. Device according to claim 8, characterized in that the circuit board (10) is substantially parallel to each guide channel (2) one concentrating the electric field lines Has rib. Considered publications:
German Patent No. 1132158;
K. Steinbuch, "Taschenbuch der Nachrichtenverarbeitung", Springer-Verlag, 1962, pp. 753, 754. 1 sheet of drawings 709 640/253 8.67 © Bundesdnickerei Berlin