DE2304742B2 - ARRANGEMENT FOR RECORDING CHARACTERS - Google Patents

Description

The invention relates to an arrangement for recording characters using a plurality of in particular of two writing systems moving synchronously along the line, preferably for inkjet writers or the like

In the case of an ink jet pen, the writing speed is caused by the droplet frequency of the write head. B. at a droplet frequency of 2000 droplets per second a writing speed of 60 characters per second achieved when a character generator adapted to the requirements of the inkjet writer is provided will. An increase to 90 characters per second is possible if a droplet frequency of 3000 to 3500 droplets per second is reliably observed and the acceleration forces that occur stay low. If the sequence of droplets is increased above 4000 droplets per second, the diameter of the droplets becomes too low and the resulting contrast too weak.

In order to increase the writing speed beyond 90 characters per second, a number has hitherto been used operated by writing heads in parallel. For example, the "Inktronic" writer from Teletype It has an article in "Product Engineering" from Oct. 10, 1966, pp. 55 to 58.40 Print heads arranged in parallel

The invention is based on the object of providing a circuit arrangement for ink writing devices provide with which it is possible in a simple and inexpensive manner with minimal circuit complexity the individual writing heads of the writing device are to be controlled.

According to the invention, this object is achieved in that the characters for all writing systems forming character generator is present with a writing system from the character generator and the rest Writing systems controlled simultaneously via buffer memories previously fed in by this character generator and thus come into function at the same time as writing.

The requirement for a low circuit complexity can be met in that the coordinate information of a first character fixed with a first Clock is written into the buffer and that after actuation of intermediate transactions switch with a second clock simultaneously the first character in the buffer and another Characters are taken from the character generator and fed to the individual writing systems, so that all characters are recorded at the same time.

In the case of a plurality of writing systems, each system has a different one for manufacturing reasons Droplet frequency, which of course results in a very strongly fluctuating typeface on one line With this invention achievable advantages are in particular that this typeface by Selection of two matching heads over the whole line remains constant and that with one insignificantly increased circuit complexity a doubling of the writing speed is achieved. It is also possible to write in two colors.

An embodiment of the invention is shown in the drawings and will be described in more detail below described. It shows

1 shows a schematic representation of a circuit arrangement with two writing systems of an inkjet printer,

2 shows a schematic representation of the double writing head in writing position with the assigned writing gaps at the beginning of writing or with step-by-step Operation,

F i g. 3 shows a schematic representation of the position of the double writing head with the associated writing gaps at the transition to the notation with uninterrupted feed and

4 shows a block diagram of the connection of a character generator to two writing systems in one Inkjet pens.

The F i g. 1 shows a circuit arrangement according to claim 1 in an ink jet printer, that is to say a circuit with two writing systems 1 and 2 which are combined to form a combined writing head 3. The information about a first character fed to the character generator 6 via the line 4 and the buffer memory 5 is entered into the X and V buffers 8 as coordinate information via the switches 7/1 and 7/2 with a high clock rate 10. The switches 7 are then actuated and the X and V information for a second character is fed to the amplifiers 9 with the clock 11. At the same time and in the same cycle 11, the coordinate information is taken from the buffer stores 8 and fed to the write head 3 together with the coordinate information of the second character via the amplifier 9. The bars 10 and 11 are fed to the character generator 6 via the switch 7/3.

The Fig.2 shows a schematic representation of the Double writing head in writing position with the assigned writing gaps at the start of writing or at gradual operation. A group of four characters that is written at a standstill, the first 12/1 and third 12/3 or second 12/2 and

fourth I2 / 4 characters written at the same time. The individual writing systems I and 2 are mounted or designed in such a way that their central axes are offset at a distance of two columns from the writing line 12. In the writing line 12, the writing gaps are 12 / 1.12 / 2.12 / 3. 12/4 etc. lined up next to one another in line direction When changing to a notation with uninterrupted feed (Fig. 3), the assignment of the individual writing systems 1, 2 to the individual writing positions in the writing line 12 changes in such a way that now two adjacent characters 12/5, 12/6 or 12/7, 12/8 etc. can be entered until the line is filled. This special change from writing a group of four characters 12/1 ... 12/4 at a standstill, to writing a sequence of characters 12/5, 12/6, 12/7 etc. “which takes place with uninterrupted feed” achieves that to accelerate the writing systems 1 and 2, the width of two writing gaps 12/3, 12/4 is now available.

In Figure 4 is a block diagram is shown, the one Connection of a character generator to two writing systems shows how they are used in the inkjet printer Application comes.

The A71, YIl information for a first character entered in the character generator 6 is entered into an A "or V shift register 8 with a high clock rate 10 (as is required, for example, for character formation in the display device). Then it is switched

tet (represented by switches 7 for the sake of clarity ) and X and Y information for the second character is written into the XIl, y> 2 registers 13, 14 with the clock 11 required for the inkjet printer.

The X and V information of the first character take the X / ϊ, Yl \ registers 15, 16 from the shift registers 8 with the same clock 11, so that both characters are processed at the same time. Immediately after taking over the last coordinate in the XJ2-. V / 2 register 13,

ίο 14 is switched to the shift register 8 by the switch 7 switched. This means that while the ink jet is still being directed to the last coordinate, the Shift register 8 filled by the third character with clock 10, so that the other characters each without any Loss of time can be retrieved from the shift registers. Repeat the operations just described until the line is finished. The subsequent signal processing according to the registers takes place in a known manner via a comparator 17 in connection with a beam position counter 13. Downstream of this are digital-to-analog converters 19. Deflection amplifiers 20, which then connect to the writing systems (and 2 connected.

The light control of the characters is done on the one hand directly from the character generator via line 23, on the other hand, for the temporarily stored character via an additional buffer memory 21. This stores the light information in the beam position counter 18 until the comparison is completed.

For this purpose 3 sheets of drawings

Claims (3)

Patent claims: 1. Arrangement for recording characters under Use of a plurality, in particular of two writing sy stars that move synchronously along the line, preferably for inkjet pens oddgL, characterized in that a the characters for all writing systems {3) forming character generator (6) available ixt where a writing system (1) from the character generator (6) and the other writing systems (2) via previously from this character generator (6) fed buffer (8) are controlled simultaneously and thereby come into function at the same time as writing. > 5 2. Arrangement according to claim 1, characterized in that the coordinate information of a character (Zl) can be transmitted with a first clock (10) from the character generator (6) into the buffer (8) and is applied by pressing »toggle switches (7) second clock (11) at the same time the character (ZJX) from these buffers (8) and a further character (Z / 2) from the character generator (6) can be fed to the individual writing systems (3) so that all iieichen are recorded at the same time. 3. Arrangement according to claim 1, characterized in that two individual writing systems (1, 2) in a combined writing head (3) are arranged offset at a distance of two writing gaps (12).