DE2729495A1 - MOSAIC PRINT HEAD - Google Patents

Description

Applicant: VEB Kombinat ZENTRONIK DDR-523 Sömmerda Weißenseer Strasse 52

Mosaic print head

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The h'rlindane concerns an Iviosaik print head for column-wise Druck rri.t extremely high writing speed that is based on a parallel zurr, aul drawing carrier force-driven Printed goods is arranged.

Such r-.x? Aü <clruckeinr: i cfrtungen are predominantly as /..usgäbegerate for information in printed form of the middle Data technology and iiJDV systems are used. There are mainly three principles in the case of Losaikdruckeinrjtungen became known, the complete printer, the column printer and the line printer.

The complete printer is generally based on a 5 ^x 7 grid 3b electromechanically moved printing elements (DT-OC 2 119 200). The large number of pressure elements means an increased production effort, an increased susceptibility to failure and, in addition to a large volume, a considerable mass to be moved along the pressure cell.

This ideation makes high demands in GTart-Stop operation to the drive and transport mechanism of the printing device. The joint density of a complete print head requires a relatively large degree of slimness of the individual print magnets, in order to avoid too great a spread and the associated known difficulties with short pressure wires. However, a large degree of slenderness of the printing magnet inevitably leads to compromise solutions that only output speeds in the order of 100 characters / s.

To reduce the mass to be moved, so-called column printing devices have become known, their print heads consist of 7 to 11 pressure magnets and the pressure elements are arranged in columns · With one of the number The higher stroke frequency corresponding to the columns can, for example, be an output speed with a 5 point / character division of 130 characters / s can be achieved. The small volume and the smaller one are advantageous Mass of the printhead, but the disadvantage is that the higher stroke frequency requires more powerful drive mechanisms, their compact design causes a considerable spread of the pressure elements (DT-OS 2 253 470).

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ORIGINAL INSPECTED

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$ 2729A95

There are printing devices known whose drive mechanisms are arranged in a circle and the prints are lemeηbe guided in the center of the circle almost parallel (DT-Oo 2 110 410; FR-1 ^J S 1 577 409; DT-OS 2 032 821; US-PS 3 770 092) · It is advantageous that the concentric arrangement of the pressure magnets enables low-friction needle guidance. However, it is disadvantageous that only a maximum stroke frequency of 1 kHz can be achieved with a reasonable effort with high-performance pressure magnets. An increase in the output speed, for example to 25Ο characters / s, can therefore only be achieved by reducing the raster points to a 4 point / character division. This reduction does not make sense because the recognizability and the number of characters that can be displayed are severely restricted. Another well-known way to increase the output speed is the so-called line printer. It is known to arrange four or eight pressure magnets at equal intervals on a rail that can be moved in small steps over the entire writing width in one line. The recording medium is driven seven times step by step by a second drive device for writing a line of characters (DT-OS 2 317 493; DT-OS 2 258 247). It is advantageous that the relatively short pressure elements can be guided with very little friction. The disadvantage is that complex electronics are required for the coordinated control of the two drives. The disadvantage is that with a character grid of 5 * 7 with four printing magnets a maximum output speed of 110 characters / s and with eight printing magnets a maximum output speed of 220 characters / s cannot be exceeded. The complex intermittent drive of the recording medium is disadvantageous. The disadvantage is that with a simpler, continuous drive of the recording medium, the rail with the printing magnets must move on an inclined path in order to achieve a horizontal row of dots. A considerable mechanical effort is required for this. It is known to provide a printing magnet for each character of a line, which are jointly stationary next to one another

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are arranged on a frame. Close to the free Ends of the printing elements is a movable baffle provided with a multitude of openings · With the help of this baffle the free ends of the pressure elements guided and continuously deflected from left to right according to a 5 point / character division (DT-OS 2,321,675). It is advantageous that up to 30 lines / s or, depending on the number of characters / print line, several thousand characters / s can be printed. The disadvantage, however, is that caused by the large number of control stages expensive expenditure on electronic components. The disadvantage is that, due to the relatively small width of a character, the considerably stronger printing magnets are offset must be arranged and thus a curvature of the pressure elements is inevitable.

It is also known to provide two separate column print heads, which are permanently assigned, in order to reduce the effort Distance of half the writing width can be moved together by a traction device (DT-OS 2 4-52 867). The disadvantage is that the mutual assignment of the Druckküpi'e must be done by justification on column accuracy and a double carriage and guide device is required is.

The disadvantage is that an increase in the output speed is only effective if the line to be output is larger than half the writing width It is also known to arrange several print heads on a common carriage in order to simultaneously record several recording media on assigned To describe printing rollers (DT-OS 2 502 076). This special printing device is intended as an output device for a cash register machine. A real speed increase is not recorded, only several separate recordings are triggered at the same time and the Reduced effort of several printing devices operated in parallel.

Finally, it is known to use the 7 or 11 printing magnets of a mosaic head in order to achieve a closed line to be arranged in such a way that the pressure wires are guided in two parallel columns in the mouthpiece offset in such a way that

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that with a stepwise movement of the print head in lateral Direction an overlapping of the points is achieved (DT-OS 2 421 658). This arrangement only makes a closed one Polyline achieved, an increase in output speed can not be reached. It is known to use stronger prints to improve the text image to use and these with regard to their altitude in the character field to offset against each other; the offset corresponds to half a column spacing (DT-OS 2 II9 416). Ultimately, it is known to provide two similar parts with guide grooves for guiding printing needles offset in this way to assemble a guide piece (DT-GI. "7 247 148). It is advantageous that this arrangement improves the typeface. However, it is disadvantageous that keep the same number of printing elements is and the printing elements are now housed in zv / ei columns offset by half a division instead of in one column · An increase in the output speed also cannot be achieved with such a print head.

The solutions for increasing the output speed, which can be taken from the known prior art, either lead to a deteriorated typeface, an unacceptably high level of effort or other parts of the picture. In parallel with this solutions for improving the typeface with the usual number of printing elements have also become known. The aim of the invention is, while avoiding these disadvantages, to realize both advantages optionally with one printing device.

The technical problem that is solved by the invention is to provide a mosaic print head for extremely to create high writing speeds with reasonable effort when using the maximum stroke frequency a printing magnet in a development of a multi-column n printhead it achieves twice the output speed of known column printing devices and optionally one realized in a closed line.

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I.iGrkinale of the invention are that the number of Fülirungskanälo learn for the prints le in the two separate exit gaps is greater than the number of print lines of the dot matrix, that the exit openings of the guide carules open dor both exit gaps are opposite in pairs in such a way that the connecting lines are opposite one another Exit openings with the exit slits on the right Form an angle, since the guide canals have at least one nustrittspalte is fully equipped with pressure elements and that the distance between the printing elements in their working state is at least twice the horizontal grid distance the printed dot column is

In an advantageous embodiment of the features of the invention, at least 12 guide channels and at least 12 printing elements are provided and the exit gaps form a right angle with the printing line or an angle reduced by the angle Uj.

In a favorable embodiment of the features of the invention, the angle oi / is equal to the arctangent of the quotient the distance between two printing elements in the working state of a printing column and twice the horizontal grid distance between two point columns

The invention is to be explained in more detail below using two exemplary embodiments.

In the accompanying drawing show:

1: the front view of the guide body with a first embodiment of the guide channel in perspective Depiction,

Fig. 2: a second embodiment of the guide channel in perspective Depiction,

Fig. 3: a first schematic representation of the temporal Sequence of the activation of the printing magnets assigned to the two printing columns when the distance of the Print elements in their working state an odd one Is a multiple of the horizontal grid spacing of the printed dot column,

Fig. 4: a second schematic representation of the time

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uer

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Sequence of the activation of the printing magnets assigned to the two printing columns, if the distance between the printing lines in their working state is an even multiple of the horizontal .box distance of the printed dot column,

Fi £ · 5ϊ the rear view of the guide body in perspective, whereby some pressure elements of both pressure columns are in the working state,

6: the representation of a printing column in enlarged form Scale when the exit columns form a right Y / angle with the print line,

7ϊ shows the representation of a printing column on an enlarged scale when the outlet gaps form an angle (90 ° - ^ L /) with the printing line and the printing elements of both outlet gaps are printed one after the other in the same printing column,

8: a schematic partial representation of the two printing columns on an enlarged scale according to F13. 6 and 7 in an exaggeratedly inclined position to illustrate the size of the tilt angle depending on the distance between the printing gaps,

9s shows a basic representation of a character in two

Phases with double character output speed and normal font quality,

Fig. 10: Basic representation of a character in two Phases with half the character output would give speed and improved font quality.

In Fig. 1, the mouth area of the guide body 1 is shown, which is part of a two- column mosaic print head, whereby the associated printing magnets are not shown in particular In the opening area, a recess is provided, for example with a rectangular cross-section, in which a flat middle piece 2 and two cover pieces 3 of the same type, provided with guide channels 9 according to the line division, are inserted. These parts 2; 3 are preferably made of wear-resistant material. In a modification are in Fig. 2, the middle piece 2 accordingly

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ORIGINAL INSPECTED

the row division with iXihrungskanäle 9 and the cover pieces 3 executed with smooth surfaces · The ones shown in J? Ig · 1 and 2 . Guide channels 9 are for example to reduce the friction with a triangular cross-section

The connecting lines of the centers of the pressure elements 4 stored in the guide channels 9 are at the outlet openings 11 of the guide channels 9 with the outlet gaps I '; II' are identical. This previously described configuration of the mouthpiece of the guide body, for example, can be modified as desired without departing from the subject matter of the invention

According to the invention, the number of guide channels is greater than the number of print lines DZ of the dot matrix and the outlet openings 11 of the guide channels 9 are in pairs in such a way that the connecting lines of opposing outlet openings 11 form a right angle with the outlet gaps Ι ·; ΙΙ * and that the distance a of the printing elements 4 in their working state at least is twice the horizontal grid spacing 14 of the printed dot column 13

These relationships can be seen from Figures 1 and 2 For a seven-line dot matrix, at least 12 Guide channels required in two exit gaps I '; II · are divided.

The outlet ^{gaps I f} ; II ^f with the outlet openings 11 have a distance 5 from one another which corresponds to the distance a between two pressure gaps I; II when the pressure ^{elements 4 'guided in the two outlet gaps I'; II f} run parallel to one another and correspond in this case at least twice the horizontal grid spacing 14 of the printed dot column 13

However, this minimum distance is in practice, such as 5, selected to be much larger, so that the pressure elements assigned to each outlet column I'jII · 4 · simultaneously columns of different characters 8; 10 of a line.

In one example, the control sequence in FIG. 3 is the Printing elements 4 driving printing magnets shown when

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ORIGINAL INSPECTED

the printing elements 4 ¹ have rapid spacing a, Ad'νί * η '' times the horizontal grid spacing 14 of the printed dot column, where η is an odd number, for example 1; 3 »5 ··· In a second example, FIG. 4 shows the control sequence of the printing magnets driving the printing elements 4 when the printing elements 4 'have a distance a which corresponds to η times the horizontal grid spacing 14 of the printed dot column, where η is an even number, for example 2; 4; 6. ·· ·

In FIGS. 3 and 4, the printing cycle T is shown horizontally as the abscissa represented by parallel lines and a sequence of numbers, the character width Z being characterized by a longer line is · The division is based on the horizontal grid spacing 14 between two columns of points 13. Vertical is as the ordinate the line sequence 1-7 of the print lines DZ plotted The application of a printing column I; II carried out in any printing cycle T is indicated by a point in each case. From FIG. 3 it can be seen, for example, that in the 1st printing cycle Ti in the 1st line only one printing point 15 of the Printing column I is generated. In the 2 · and 3 · printing cycle, one printing point 15 of the printing column I and one are created in the 3 · line Pressure point 16 of the pressure column II is shown. In contrast to this, according to FIG. 4, there is always only one pressure magnet in each cycle T a print line DZ controlled. By the way, they are Conditions analogous to FIG. 3. With a mosaic print head designed according to the invention, two types of printing can be selected can be achieved:

- Printing with twice the character output speed with at least seven pressure points 16 in the printing column I; II,

- printing at half the character output speed with at least twelve pressure points 15 »16 in a printing column I; II.

The mosaic print head can be adjusted by slightly tilting its vertical axis by the angle with respect to the print line of switch from one type of pressure to the other.

To carry out the controllable tilting of the mosaic print head, which is arranged, for example, on a printing carriage, known e Ie ctrome chanical means are used · This makes it possible while pressing a line to change the type of printing, for example to add a word or to let part of the sentence emerge in writing

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. ORIGINAL INSPECTED

1. Double-digit printing at cable speed

For printing at twice the character output speed, the mosaic print head is in the normal position, ie the exit gaps Ι ·; ΙΙ 'are oriented at right angles to the print line DZ. The printing elements 4 assigned to the exit gaps I '; II ^f are driven simultaneously in accordance with the grid of the character or characters to be printed and, depending on the distance a, each print a column of the character or characters 6 shows an already completely printed character 7 in a 7 x 5 dot matrix · The following incomplete characters 8; 8 ^f were created in the passage through printing column I and are completed in the subsequent passage through printing column II · In Fig. 5 the point in time is shown when the The first dot column 13 of the second character 8 have already been ^{printed by the printing elements 4 1 of} the printing column I and just three printing elements 4 'of the printing column II represent the second dot column 13 of the character 8. At the same time, the printing elements 4 * of the printing column I represent the first dot column 13 of the fourth character 10. By simultaneously printing two dot columns 13, 14 printing magnets can achieve an output speed of 334 characters / s with the same character quality, if the maximum stroke frequency of the pressure magnets is 1 kHz. A reduction in the additional cost of printing magnets can be achieved by equipping the exit column II ¹ with only five printing elements 4. The five printing elements 4 are distributed over the seven guide channels 9 of the printing column II ^{1 in} such a way that only the guide channels associated with one printing line DZ 9 of both exit columns I'jII ^{1 are} fully equipped, which are required for a legible representation of most of the characters. This is to be understood as the printing characters DZ, in which the matrix of the most important characters has dots lying one behind the other, i.e. preferably the first, fourth and seventh printing line DZ of a seven-line matrix · With an arrangement of 7 + 5 printing elements, which are of this type

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are distributed over the exit column I * and II *, can be used with The output speed is also doubled with reduced effort can be achieved with acceptable character quality · In FIG. 9, the representation of a character, for example "R", shown in two phases. The first phase corresponds to the completed run of the Printing column I, the second phase corresponds to the passage of printing column II that completes the character. The grid 7-5 the dot matrix is retained.

2 «Print with improved font quality

For printing with improved üchrift quality the idosaic print head is tilted by an electromechanical device, which is not the subject of the present invention, by an angle c0 with respect to the print line DZ, ie the exit gaps Ι ';ΙΙ' now close an angle with the print line DZ compared to the normal position 9O ° -oC a. The size of the "Vinkelso ^" depends on * distance a between two printing columns ^{I; II or between two outlet gaps X 1 JlI 1} in the case of a parallel course, the distance a between the printing gaps I; II and the distance 5 between the outlet gaps I *; II ^f slightly differ from each other. By tilting the mosaic print head by the angle ού it is achieved that between two pressure points 15 of the printing column I in each case a printing point 16 of the printing column II is inserted and thus the printing column I originally consisting of 7 printing points 15/16 is now inserted into an aua 14 Pressure points 15; 16 existing pressure columns I + II is transformed. The principle is shown in FIGS. 6 and 7. The distance between two printing points 15; 16 is now • j · The relationships are exaggerated in FIG. 8 at 3 printing points per printing column I; II. This creates a closed line and improves the legibility of the character.
The angle oi results in general from:

O ^ - arc tan

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In a practical embodiment, the distance a between the printing columns IjII should be twice the horizontal grid spacing between two dot columns 13. The distance a thus becomes 5 t 04 now and the angle is deceitful 2.2 °.

The printed character is tilted in relation to the ideal vertical and the angle, which results in the dot gaps of the printed character in the size of a? x 5 matrix offset by only 0.09 rcm from the ideal vertical. This slight offset is not sufficient to have an adverse effect.

In PIg. Figure 10 is a representation of a character, for example "R" shown in two phases.

The first phase corresponds to the completed run of the printing column I, the second phase corresponds to that of the character completed run of the printing column II The external dimensions of the 7 ^ 5 dot matrix are retained in terms of size, although 14 χ 9 points have now been placed.

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L e r s e i t e

Claims (1)

Claims Mosaic print head for column-wise printing with extremely high writing speed, which can be moved on a print carriage along the print cell, which has a large number of print magnets on it, each print magnet drives a print lenient in the direction of the recording medium, the free ends of the print elements are mounted in guide channels , the outlet openings of which are arranged in two separate outlet gaps, characterized in that the number of guide channels (9) is greater than the number of print lines (DZ) of the dot matrix, that the outlet openings (11) of the guide channels (9) of the two outlet gaps (I ¹ ; !!! ¹ ) face each other in pairs in such a way that the connecting lines (12) of opposite outlet openings (11) form a right angle with the outlet gaps (Ι '; ΙΙ ·) so that the guide channels (9) at least one outlet gap ( 1 ^ 1I ¹ ) are fully equipped with printing elements (4) and that the distance (a) of the printing elements (4 ^f ) in their Arbeitsz ustand is at least twice the horizontal grid spacing (14) of the printed dot column (13). Mosaic print head according to claim 1, characterized in that at least 12 guide channels (9) are provided Mosaic print head according to Claim 1, characterized in that at least 12 printing elements (4) are provided. Mosaic print head according to claim 1, characterized in that that the exit gaps (Ι '; ΙΙ ») with the print line (DZ) form a right angle. 5 · mosaic print head according to claim 1, characterized in that the exit gaps (I ^f ; II · ) form an angle (90 ° -) with the print line (DZ). 809809/0673 ORIGINAL INSPECTED G. I. 'mosaic print head according to claim 5i, characterized in that that the angle () is equal to the arctangent of the quotient from the distance (a) between two printing elements (4) in the working state of a printing column (I; II) and the double the horizontal box spacing (14) between two point columns (13). 809809/0673