Ink jet copier

© Al

460.102

MINISTRY OF INDUSTRY REGISTRATION OE INDUSTRIAL PROPERTY © es® ©

DATE OF PRESENTATION

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25-6-1977

SPAIN

PATENT OF INVENTION [3Cj PRIORITIES * ^ NUMBER

700.632

28-6-76

USA

<td>θ ADVERTISING DATE</td><td>(^ INTERNATIONAL CLASSIFICATION</td><td>PATENT OF THE OUC IS DIVISIONARY</td>

<td></td><td>BOIL</td><td></td>

Θ

TITLE HEARS THE INVENTION

IMPROVEMENTS INTRODUCED IN A COPIING MACHINE BY GROUPS '«OUCITANTC (»&gt;

INTERNATIONAL BUSINESS MACHINES CORPORATION (BO9-75-O19

ADDRESS OF «OUCITANTC

Armonk, New York 10504, United States of America

Q) INVENTOR IES)

Sidney Jared POX, Van Clifton MARTIN and Danny Alien Van HOOK »31 HOLDER

REPRESENTATIVE

DON FERNANDO DE ELZABURU MARQUEZ (eg .241)

TGG

UNC A · 4 MOO. 3f0 «

BE USED AS THE FIRST MEMORY PAGE

Hojn no. one

FUNDAMENTALS OF THE INVENTION »

Field of the invention

The invention relates to copiers in general, and more specifically to multi-nozzle ink jet copiers, in which a plurality of ink jet nozzles are arranged in a plurality of linear groups or clusters around the periphery of a drum. swivel media holder, and the information scanned from a document is pre-arranged in a memory and subsequently transferred to the linear groups of nozzles at appropriate times previously determined to reproduce a copy of the scanned document on a medium supported on the drum.

Description of the prior art

Inkjet copiers generally generate digital information that defines an image and apply the digital information directly to a printer or inkjet printers, or apply it indirectly through a memory storage device that may or may not include a redisposition of digital information. In cases where multiple ink jet nozzles are used, they may be arranged in a linear grouping parallel to the axis of a drum that supports the paper or other means on which the image is to be formed. When the drum is rotated, the ink jet pool is axially transported and the digital information is used to^-selectively control the ink jets, in order to reproduce in this way the image on the medium supported on the drum.

Hojn no. two

In cases where multiple nozzle clusters are used, the images formed by each nozzle can follow interwoven spiral designs over the medium. A perfect interlaced design is necessary to ensure complete coverage and prevent double or multiple coverage of some areas over the medium. Various methods will provide such spiral interlocking design.

The nozzle clusters can be manufactured in such a way that the distance between nozzle centers is made equal to the desired distance between centers of the ink drops on the medium. This method provides automatic interlacing, but the required distance between nozzles is impractical if a high print resolution is required. Manufacturing problems appear that make this solution unacceptable since distance, for any reasonable degree of resolution, is inadequate to accommodate the structural elements required to perform the required function.

A greater distance between nozzles in the cluster can be achieved by arranging the grouping at an angle with respect to the axis of the drum since the angular arrangement provides a closer axial distance between drops, while allowing a greater distance between nozzles; However, this solution introduces a new problem. When the grouping of nozzles is at an angle with respect to the axis of the drum, the drops from the different nozzles in the arrangement have different flight times due to the different distances

Sheet No. J to the surface of the drum. This produces varying degrees of erroneous droplet displacement depending on the number of nozzles and their distance in the grouping. The problem of different flight times can be avoided by arranging the nozzles on a curved support plate that follows the contour of the drum of so that all the nozzles are equidistant from the surface of the drum. This solution is far from ideal, since it requires a structure that is difficult to manufacture and align.

The nozzles and clusters may be staggered to provide additional space. However, this solution leads to additional problems in the sectors of uniformity of the propulsion system, diversion when two or more rows are used, and drainage problems.

A more desirable solution would allow complete freedom in the distance between centers of the nozzles, which would allow a distance between centers of nozzles greater than the distance between centers of the drops on the paper in the axial direction, with an insignificant sacrifice of speed of print or resolution. Such a solution would facilitate the manufacture of the nozzles and allow a much wider choice of existing nozzle technologies, such as stretched glass nozzle clusters or corroded amorphous material clusters, all of which require a substantial distance. In addition, the freedom in the distance · minimizes the problems in the assembly of the electrodes of load, in the systems of deviation of drainage, and other proPHojn no. 4

- Problems related to electrical intermodulation are solved more easily.

Summary of the invention

The invention considers an inkjet copier with multiple nozzles in which digital information signals, representative of an image to be reproduced, are received from a line scanner or the like. The signals are stored, one line at a time, in one of two interim memories on an alternate basis, under the control of chronological regulation signals supplied by a chronological regulation signal generator. The signals stored in the provisional memories are stored, under the control of a setpoint generator, in previously determined places in a main memory. The setpoint signals used to select the information signals to be stored - and the placements in the main memory to store the selected signals are generated from the chronological signals and are representative of line, nozzle and line placements. main memory words, expressed as modular displacements from a reference. Information signals stored in the main memory are accessed under control of setpoint signals generated by an output setpoint generator under control of the chronological regulation signal and a drum synchronization signal provided by the drum support system. paper. The drum synchronization signal appears N ^, times for each revolution of the drum, in which it is equal to the total number of nozzles in the nozzle clusters. The signs of

F (lojn ηήπη. 5

10.

20.

Information read from memory is stored in selected records to control the associated inkjet nozzles. The nozzles are arranged in a plurality of linear clusters around the periphery of the paper support drum and provide an interlaced image on the paper when the drum is rotated and the nozzle clusters are transported simultaneously in an axial direction, the nozzles in the groups they are distanced in k resolution elements, and the grouping advances in resolution elements in the axial direction in each revolution or rotation of the drum.

Brief description of the drawings'. Figure 1 is a block diagram of a complete ink jet copier, constructed accordingly? do with the invention; · -

The figure. 2 is a schematic diagram of the grouping of nozzles and the drum, to be illustrated, in Figure 1;

Figure 3 is a perspective view of the drum shown in Figure 1;

Figure 4 is a schematic diagram illustrating the segments and printed lines, and identifies the 'various nozzles and clusters that print the various segments;

Figure 5 is a schematic diagram of the chronological regulator shown in Figure 1, and includes graphical representations of the output signals from the chronological regulator;

Figure 6 is a detailed block diagram

PH No. 6 dsl Spring Organizer illustrated in the figure. one;

Figure 7 is a detailed block diagram of the Signal Value Generator shown in Figure 1;

Figure 8 is a block diagram of the cluster and switch registers shown in Figure 1;

Figure 9 is a block diagram of the Setpoint Generator illustrated in Figure 1; Y

Figure 10 is a graphic representation of chronological regulation relationships used in the illustrated circuits.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Figure 1 is a block diagram of an inkjet copier, and includes a document scanner 11 arranged to scan a document to be copied. The document explorer 11 can take any form; preferably, the document browser should be arranged to scan serial horizontal lines in succession by the length of the document, and provide a serial data stream indicative of the image content of the document on a line-by-line basis. The document browser 11 is controlled by a chronological signal generator line synchronizer 12. Line synchronization signals cause the document browser to scan one line at a time when each line synchronization signal appears. The chronological regulation signals of .data provide bit information. Typically, document explorer 11 will provide 40 lines llojn no. 7 in a document length of 6.53 mm, and the chronological data controller will provide 1,400 bits of information on each of the scanned lines. The values ​​set forth above are typical of an ink jet copier, if it is constructed in accordance with the invention, described in the specification. Obviously, these values ​​can be varied over a wide range depending on the resolution required in the copy.

The uncoded video data from the document browser 11 is applied to the data input of a spring organizer 14, The spring organizer 14 performs several functions that will be described below. The details of the spring organizer 14 are illustrated in Figure 6 and the detailed description of how the spring organizer 14 performs its function will be described in connection with the description of Figure 6.

The spring organizer 14 is provided internally with two memory zones. The successive lines of data from the browser 11 are stored in these memory locations according to a previously determined scheme. The data in the first line, for example, is stored in the first storage placement. After this data has been received, the data from the second line is stored in the second storage location. - While the second line is being stored in the second placement, the data previously stored in the first placement is selectively inserted in main memory 15. The spring organizer 14 utiHojn no. 8 It lists four control signals provided by the chronological regulation signal generator 12 and three additional signals provided by a signal value generating circuit 16. In addition to the chronological data and line synchronization signals applied to the document browser 11, the organizer 14 receives a cycle chronological regulation signal and a group chronological regulation signal from the regulation signal generating circuit - chronological 12. The three signals received from the input signal value generator circuit 16 are a line value marked with L, a nozzle value marked with N, and a word value marked with W. The signal value generator 16 receives the line synchronization signals and the chronological regulation signals from the chronological regulation signal generator 12 and a previously adjusted value signal stored in a register 17 · · The value generator input signals 16 is illustrated in detail in figure 7 »and a description of the operation of this circuit will be given in conjunction with the description in figure 7 · The contents of register 17 represents a misalignment of the paper or media 24 with respect to a mounting drum or media holder 22 on which and with respect to which the image is generated. If there is no misalignment, the value stored in register 17 is zero.

The data stored in the spring organizer 14 is presented to the main memory 15 based on the input signals from the chronological regulation signal generator 12 and the vaHojn generator No. 9 signal logs 16. The actual storage locations selected are determined by a setpoint generator 18 that responds to the signals L, 'N, and W from the signal value generator 16, generating the setpoints within which the data presented by the organizer will be placed of spring 14. The setpoint generator 18 provides an output signal that is inserted in a setpoint register 19 that actually controls the locations within the main memory 15 where the data from the spring organizer 14, The setpoint generator is inserted. 18 It is shown in greater detail in Figure 10 and will be described in conjunction with the description in Figure 10.

The image data stored in the main memory 15 is applied, one word at a time, through a switch 20 under control of the nozzle value N from the signal value generator 16, to the groupings 21A to 21E. The stored signals control the nozzles associated with each of the ciric groupings, thereby controlling the deposition of ink on the medium mounted on the drum 22. the groups are propelled by a group propulsion system 25 in an axial direction along the periphery of the drum. Thus, each nozzle describes a spiral around the drum, selectively modulating the ink deposited by the nozzles when the nozzle cluster is axially propelled, and the drum is propelled in a rotational direction that causes the image to appear on the medium 24 mounted on the drum 22. Clusters 21A through 21E are shown in greater detail.

FHojn no. 10

20.

in Figure 2A and in Figure 2B, and will be described in conjunction with the descriptions of these figures.

A read / write control signal from the chronological controller. 12 is applied to main memory 15; and when each memory setpoint is generated by the setpoint generator 18, as described above, a read cycle is executed which causes the contents of the memory placement to be applied to the groups described above. Reading cycle

I is followed by a write cycle in which the new image information is stored in the setpoint indicated by the setpoint generator 18. This information will be supplied to the nozzle groups the next time access to this setpoint is obtained in the main memory 15. A drum synchronization signal is applied to the chronological regulation signal generator 12 and causes a line synchronization signal emitted from it to be synchronized with the drum synchronization signal, and thus the data coming from the document browser. 11 cannot be left behind or ·· go beyond ie the impression that occurred on the medium

24. This prevents excessive or insufficient shifting of data in memory 15, thereby reducing the amount of storage space required. The details of the output signal value generator 16 are illustrated in the figure? and will be described in conjunction with the description of that figure. Switch 20 and the data records associated with groupings 21A through -21E are shown in greater detail in Figure 8 and will be described in conjunction with the description of that figure.

Sheet No. H

Figures 2 and 2A illustrate the drum, the group assemblies and the group propulsion system. The drum 22 is supported to rotate through structures that are not shown. Adjacent to the periphery of the drum is a cluster propulsion motor 28 that propels a lead screw 29.. The cluster support 30 is mounted on the head screw 29 and moves in an axial direction along the surface of the drum on the screw 29. Forty ink jet nozzles 31 schematically illustrated, are supported on the cluster holder 30. These nozzles are arranged in five linear groups, each of eight nozzles. The details of the ink jet nozzles and associated ink jet printing mechanisms have been intentionally suppressed, since conventional ink jet nozzles and conventional ink jet printers can be used with this invention, because the placement of the nozzles on the nozzle holder. 3θ is substantially unrestricted. The specific arrangement of nozzles, described above, is illustrative only. A large number of nozzle arrangements can be selected if the rules set forth below are followed. jo.

According to the invention, the distance between the centers of the nozzles in each of the clusters has virtually no restriction, since adjacent nozzles are not required to cover adjacent segments of the drum circumference. Each of the circumferential lines around the drum is divided into segments llojn no. J.2

-of equal length and the number of selected segments is equal to the total number of nozzles and the lines · are separated from each other in a resolution element. This criterion allows the distance of the nozzles to be greater than the distance between the centers of the drops or the lines on the paper with an insignificant sacrifice of the printing speed or resolution. In addition, it allows the manufacture of nozzles using a much simpler procedure, since distance restrictions can be eliminated. This consideration expands the number of useful technologies available for manufacturing ink jet nozzles. For example, groups of stretched glass nozzles or corroded amorphous materials can be used, since these are currently limited to greater distances. In addition, · the assembly of charging electrodes, the drainage diversion system and the problems related to electrical intermodulation become much easier to solve. The described techniques can be used in copiers of a single grouping: or of multiple clusters. The requirements for the memories, as presented in main memory 15, are minimal facts using 'multiple clusters of nozzles placed around the circumference of the drum as illustrated in Figure 1, provided that they are found' intertwined properly. This is due to the fact that the required memory storage is directly related to the axial length subtended by the clusters.

Considering the placement of the nozzles in a cluster, two cases should be considered, the cluster

Hojn nftm. Simple IJ, and multiple clusters spaced around the periphery of the drum.

In an individual grouping comprising N nozzles spaced apart from each other in k resolution elements, the criteria for entanglement are the following, where N and k are both integers.

1) The grouping of nozzles must advance in the axial direction in N resolution elements for each individual revolution of the printing drum.

2) For k capable of being decomposed into prime factors, such that k = AxBx ... x Μ, N must be an integer that does not have prime factors in common with k, that is, the fraction k / N must be irreducible?

According to the foregoing, the first nozzle prints, for example, segment 1 for a given scan line, the second nozzle prints segment 1 + k, the third one prints segment 1 + 2k, etc. With it in order that all segments are printed without overlapping impressions of any segment, the first segment must not be reached again in the previous sequence up to 1 + Rk. Examples of combinations of k and N that will be intertwined are given below.

1) k = 2, N includes the group of all odd integers.

2) k = 3, N includes the group of all integers that are not multiples of 3.

3) k = 4, N includes the group of all odd integers;

4) k = 5 »K includes the group of all integers that are not multiples of 5.

Hojn no. 14

5) k = 30 ¿2 x 3 x¿7, N includes the group of all odd integers that are not multiples of 3 or 5 · If the fraction k / N is reducible, the grouping of nozzles does not it will be intertwined, and areas with double printing or skipped areas will result.

The second case considered and illustrated in Figure 1 and in Figure 2 is that of multiple groups of several nozzles, · A plurality of M groups of nozzles, identical having a total of N ^ nozzles, are shown in Figure 2. The nozzles are separated from each other in the grouping into K resolution elements. M, the number of groupings, N, the number of nozzles per group, and k the multiple of the resolution elements are all integers. The criteria-for entanglement are as follows.

1) The transportation of nozzles should advance in the axial direction in N ^ resolution resolution elements revolutionized in which N ^ is the total number of nozzles. * Ό

2) The fraction Tk / M divided by TN must be --— irreducible. The numerator and denominator should not have common prime factors. T is the smallest integer number between 1 and M, such that^-Tk / M is also a tero number (it follows that M / T is also an integer). The value of T required to satisfy the above expressions indicates the need to match groups of keels. If T is equal to 1, there is no restriction on the nozzles as regards the pairings. If l is equal to 2, the groupings must be in even number^-and they must be matched into two groups displaced each in 1802 ,. If T is equal to 3, the number of groupings must be a

Ρ10

Sheet No. 2, ^

-multiple ¿Three and must be arranged in three groups separated from each other in 1202. In a multiple grouping in which T is equal to 2, the pairs of groups of clusters must be distanced in 1802 from each other; however, the distances between each group will be dictated by other requirements, namely by what place in the drum the grouping segments should begin.^ANDThis will be treated in greater detail when describing the specific embodiment shown.

A grouping arrangement can be selected according to the operations set forth below. . .one,

1) The desired value for fc is chosen to provide the desired resolution according to the expression 1 / resolution = separation between nozzles / k.

2) The number of desired groupings of M. is selected.

3) The exposed fraction is resolved or calculated.-previously to determine the value of T and the allowable number of nozzles. The minimum T is found which satisfies the equality Tk / M equal to an integer, and it is concluded that the equation set forth above is irreducible.

. 4) For a minimum print moderator or main memory requirement, all groupings must be aligned in the axial direction with a common circumferential line, as illustrated in Figure 2. The groupings do not necessarily need to be axially aligned with a common circumferential line. In this case the axial alignment can be classified in terms of distance between clusters. However, if these .50

Hoj λ no. 16 • are not aligned, however interlacing will occur. to, but an increased main memory will be required in all cases where information is being scanned and printed at the same time. The angular distance for axially aligned groupings can be any multiple of 5602 / N ^ that is not a multiple of 360 x K / N ^, · of any other group in which 3602 / N ^ corresponds to a segment.

In the illustrated embodiment, five groupings, 21A through 21E, are used. Each of these groupings includes eight nozzles 31. The nozzles in the groupings are spaced apart from each other in five resolution elements, and therefore the values ​​given above are N b 5] K = 5, K b 8, ffl = 40. When these values ​​are substituted in the equation given above, T has a value of 1, and therefore the groupings are not paired and can be angularly distanced according to the description above. An angular distance of 92 between clusters was selected. You selected 9^S of all the possible orientations, since - it allows an easier visualization of the operation. - A selection of 542 is also an excellent choice, as it provides adequate space between clusters so that the inkjet nozzle housings still have adequate space opposite to the clusters to install paper handling equipment, in order to allow that paper is inserted and removed automatically or manually in the drum. ''

Figure 3 illustrates the drum 22 with the paper 24 mounted thereon and the tamHojn synchronization generator no.

j-bor 27. The drum synchronization generator includes the disk 32 which has 40 transparent lines lined around the periphery of the disk. The disk 32 is fixed to the drum 22 and rotates with it between a light spring 33 and a detector 34. When the light from the spring 33 is detected by the detector 34, the drum synchronization signal is provided by the detector 34. This signal is applied to the chronological regulation signal generator circuit 12 illustrated in the

10 'figure 1, ί

Figure 4 illustrates 40 scan lines as reproduced in the drum. Each of the 40 scan lines includes 40 segments. The drawing in * figure 4 is very deformed in order to present the information »- Ί in a way that is clearly understood. - The 40 scan lines typically occupy 6.53 rom on the drum or on the paper mounted on it. The drawing contains a series of numbers. The first digit in each of the double digit numbers represents the grouping number. The second digit of the double digit numbers represents the number of nozzles within the cluster that produced the image in that particular segment. Either one of the double digit numbers has the same extension as one of the segments .. Therefore,. in the first scan line the first segment is produced by the first nozzle of the first grouping and the. number is 11. The second segment of the first line is produced by the first nozzle of the second agrr pation. The third segment is produced by the first keel of the third group, the fourth segment is pro

Sheet No. 3.Q led by the first nozzle of the fourth grouping, and the fifth segment is produced by the first nozzle of the fifth grouping. The second nozzle of the first cluster reproduces the sixth segment in the first scan line. The sequence continues along the scan line. The eighth nozzle of the fifth cluster reproduces the first segment of the second scan line and all other nozzles in clusters are shifted in a segment to the right. Subsequent lines are produced in the same way with the segments produced by the preceding nozzles on the right, and moving back to the left - when segment 402 was made on the preceding line. All illustrated design occupies a single drum revolution. In a subsequent revolution of the drum another 40 scan lines are produced · The 40 lines illustrated in Figure 4 are deformed, as discussed above, and only occupy approximately 6.53 mm of space in the vertical direction on the paper , 'on which the image is being produced. However, the width is substantially as illustrated in Figure 4. A full page, of course, will require many reproductions one after the other of the 40 lines illustrated in Figure 4.

Figure 5 is primarily intended to illustrate the output signals from the chronological regulation signal generator 12 shown in Figure 1. The chronological regulation signal generator includes a standard Oscillator 55 7 the necessary logic and logic circuits 56 for produce the four output signals llojn no. 3. ^ »

illustrated, in response to the drum timing signal supplied by the drum timing generator 27 of Figure 1. The details of the chronological controller 12 are not illustrated here, since conventional circuits can be used to provide the chronological regulation signals illustrated in figure 5. These will typically include counting circuits, logic circuits, differentiators and integrators to work with the pulses from the patron oscillator 35 to provide the output signals illustrated in Figure 5. .. ..

The drum synchronization signal from the drum synchronization generator 27 is arranged once for every 40th revolution of the drum 22. This signal causes the line synchronization signal from the chronological regulator 12 to be emitted, and by Therefore, the line synchronization signals are produced substantially to the same extent as the drum synchronization signal. 140t signals of chronological data regulation are produced between each line synchronization signal, to thereby provide the 1,400 bits per scanned line mentioned above. In addition, the period between line synchronization signals includes 56 cycle chronological regulation signals. Cycle chronological regulation signals can be symmetric, or do not necessarily need to be symmetric. If the two treatment times for the spring organizer 14 are symmetrical, then the signal can be symmetric. However, if the read operation requires more time than the operation

Sheet No. 20, this can be accommodated by making the cycle chronological regulation signal asymmetric within each of the 56 cycles, the grouping chronological regulation signal includes five pulses during the positive cycle of each of the chronological regulation signals of cycle, yielding 280 pulses between successive · line synchronization signals.

The spring organizer 14 of Figure 1 is illustrated in greater detail in Figure 6. The data signals from the explorer 11. are applied to a shift recorder 37 and are displaced therein under the control of the chronological regulation signal. data from the chronological regulator 12. ΕΓ shift register 37 stores five bits and is provided with five parallel output signals · that are applied, through a door circuit · 38 and a 3% switching circuit to one or another of the two registers of ' input data 40 and 41 associated with random access memory cells 42 and 43 respectively. The data signals are shifted within the shift register 37 under control of the chronological regulation signals from the chronological regulator. 12. In addition, the chronological data signals are 'applied to a counter 44 from 1 to 5. By counting' five, the counter 44 provides a signal that enables gate 38 and resets the counter 44. When the door 38 is enabled, the content of the shift register 37 is applied in parallel to the switch 39. Depending on the state of the control signal, the contents of the shift register 37 is applied to the data record of the "ηύτη" . 21 trada 40 or to the input data record 41. The control signal applied to the switch 59 is generated by a trigger circuit 45 which is switched by the line synchronization signal from the chronological regulator 12. In this way, the control output signal from the trigger 45 combines status with each line sync signal. During a line period, the content of the shift register 37 is applied successively to each five-bit period to the input data recorder 40 ,. while during the next line period the content is applied in series to five bits in parallel to the input data register 41.

The content of the input data records 40 and 41 are stored in memories 42 and 43 respectively in placements defined by the contents of the record records 46 and 47 respectively. The actual setpoint inserted in any of the registers 46 or 47, depending on the state of the trigger 45, is generated by a counter 48 that responds to the output signal of the counter 48. Counter 48 counts from '1 to 280, since 280 is the maximum number of setpoints required in memories 42 and 43. This amount will accommodate 1,400 bits in a single scan line, since 280 consignable positions each of which contains 5 Bits equal. 1,400 bits per stored line. The output signal of the counter 48 is applied through a switch 49 to any of the registers 46 or 47 depending on the status of the control signal from the trigger 45 When the control signal occupies a state, the content h10

Sheet No. 22 of the counter 48 will be inserted in register 46 and when the oontrol signal occupies the opposite state the content will be inserted in register 47. Registers 46 and 47

I as well as 40 and 41 work in synchronism under control of the control signal from trigger 45 to cause the contents of the scanned line to be inserted alternately in memories 42 and 45. An encoder circuit 50 that responds to the signal from Counter output 48 decodes the count of 280 and resets counter 48 so that it is prepared to undergo the next scanned line. This completes the description of Figure 6 in regard to the reception of data from the browser and the insertion of the data received in memories 42 and 45 on a basis of alternating lines. The rest of the description that follows will be related to the removal of the contents of reports 42 and 43, and to the insertion of these contents in the appropriate places in main memory 15.

The contents of memories 42 and 43 are made available in output data records 51 and 52 respectively. Memories 42 and 43, depending on the particular type selected, can be controlled by the output of trigger circuit 45 as to which one will be in a reading cycle and which will be in a writing cycle, since these cycles are opposite in any given time for the two memories, that is when the data from the line browser is being stored in memory 42, the content of the memory · 43 that represents the data of the previous scan line will be read within the output register 52 and will be inserted 25

Sheet No. 2J tados, as will be described below, in main memory 15. The output registers 51 7 52 are connected by a switch 53 and by five doors 54-1 up. 54-5 with a data entry register 55 associated with main memory 15. The operation and function of doors 54-1 through '54 -5 will be described below.

The chronological regulation signal A from the chronological regulator 12 is applied to a counter 56 which counts from 1 to 5 and is reset. The output signals illustrated in counter 5θ provide an indication of the count. These are marked by A and will be used anywhere in this circuit and will be described later. These output signals are also applied to a decoder circuit 57 which decodes. actual count Al to A-5 and reset counter 5θ after the count of A-5 has occurred. The output signals of decoder 57, Al through A-5, are applied to doors 54-1 through 54-5, respectively, and therefore the first five bits from memory 42 or memory 45 are applied to through the - * gate 54-1 to the first five positions of the input register 55 «The second group of five bits is applied through the gate 54-2 to the second positions of five bits in the input data register 55, © be, until the last group of five bits is inserted in the last five positions of the input register 55 · Referring again to Figure 5, it should be noted that the chronological signal A, or chronological signal of grouping, contains five imputes in one half of the cycle chronological regulation period. This is necessary, since

PHojn no. 24 · Five instructions in memories 42 δ 43 must be processed for a period of chronological cycle since the word length in main memory 15 is 25 bits and the length is. Memories 42 and 43 are five bits- Therefore, the content of five setpoints in memories 42 or 43 is collected in the input data register 55 during each cycle chronological signal for later insertion into the memory .15 · These are mounted under the control of counter 56 and decoder 57 · ί

A setpoint generator 5θ receives the signal from the counter 5θ »the output signals 1, N and W from; - from the signal value generator 16 and computes the setpoint as indicated in the expression in the drawings. The computed setpoint is applied through a switch 59 under control of the control output signal. I proceeded from trigger 45 to register 46 or register 47, depending on the state of trigger 45. It should be noted that the setpoint from the counter 48 and the signal 20 from the generator 53 will be applied to different registers 46 and 47 because the control signals from the trigger 45 are in opposite states and. They are applied to switches 49 and 59 respectively. Thus, data will be written into one memory while these are being removed from the other memory and the papers will be reversed with each successive line synchronization signal. The arrangement and operation of the 5S setpoint generator must be evident to those skilled in this technique. Typically, this string generator will be constructed from SOPHoja no. 25 «

"Conventional liquids to specifically provide the output signal indicated from the input signals provided. A general purpose computer could be used. However, the required speed and the required limited function would collide in many cases - against such choice.

Figure 7 is a detailed diagram of the signal value generator 16 illustrated in Figure 1. The

---- Chronological data control signals are applied to an A 60 counter that is provided with five counting stages that have paired outputs Al, A2, A4, A8 and A16. The outputs Al, 32, 35, A8 and AIS are applied through a Y 61 gate to the reset input of the -6G meter. Thus, the counter 60 is reset after the count of 25 chronological data pulses. This corresponds to the number of bits in a word in main memory. The output of gate Y 61 is connected to a counter B 62 which has three stages to provide a count of words W ranging from 1 to? or, said differently, from 0 to 6. The outputs Bl, B2 and B4 of counter B 62 are connected with a gate Y 63 that has its output connected to the reset input of counter 62. The output of gate Y 63 It is also connected to an E 64 counter that has four stages, whose outputs are marked by ElfE2, E4 and E8. These constitute the nozzle value N, the outputs El, 12, ls5 and E8 are connected to a gate Y 65 which has its output connected to the reset input of the counter 64 which counts up to 8, and is readjusted, providing this In this way, an indicative output signal of the eight nozzle values.

Hojn no. 2S

The previously adjusted value stored in register 17 of Figure 1 is applied to previously set a counter F 66.. The line synchronization signals from the chronological regulator 12 of Figure 1 are applied to the stepped input of the counter 66 which has six stages and provides the ΐ line ·! Count. The outputs 5Γ, W, F8, YES6 and F32 of the counter 66 are applied through a gate Y 67 to the reset input of the counter 66. Thus, counter 66 - counts from 1 to 40 to indicate which of the 40 scan lines is being treated. Obviously, many more than 40 lines are treated. However, these are treated as groups of 40 by the circuits described above.

Figure 8 illustrates some of the details of groupings 21A through 21E and the relationship of switch 20 with them. Switch 20 is connected to the output register associated with main memory 15 and receives 25 bits in parallel from it. In addition, it receives the N signal from the signal value generator 16. Each of the groups 21 includes 8 nozzles NO to N7. A record 77 is associated with each of the keels. There are a total of 40 such records. The 8 registers 77 associated with the first cluster are connected in parallel with the first five bit positions from the main memory output register 15 through the switch 20. These registers are selectively connected under control of the N signal from the generator. of signal values ​​16. The 8 registers 77 associated with grouping 2 are connected with bit positions 63 through 103 of the register (lojn no.

Output of memory 15 through switch 20 under control of signal N from the value generator 16. Similarly, the 8 registers associated with each of the third, fourth and fifth groups are connected to the following immediate five-bit groups from the main memory output register 15 through the switch 20 under control of the N signal from the signal value generator 16. The registers 77 are loaded in parallel through the switch 20 and the data contained therein is moved in a serial mode under control of the chronological data control signal with the nozzles connected, as indicated in the drawings. ;

Figure 9 illustrates in greater detail the setpoint generator 18. The physical details of the setpoint generator of multiple outputs 18 are not shown, since - it can be constructed from normal components to perform the functions sketched in algebraic form. inside the box.

Three intermediate calculations are illustrated in the box In the first intermediate calculation the line value L is divided by k to provide an integer I and a fraction P.

. The integer I converted to Mod N gives a value I '. The value I 'and the fractional part P of the previous give a value I'.P that is multiplied by k to give a value A *. The value A 'indicates the starting setpoint for each group of nozzles. This value, however, is an intermediate value that is multiplied by a constant P (= 7 = number of words per segment) added with the val

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-of word W and a 4N value to give the actual setpoint where data is retrieved or arranged depending on which portion of the cycle chronological regulator is active (read or write).

The R, Mod N and 4N values ​​are calculated in advance and stored in the multi-output setpoint generator 18 for each nozzle. The following table is based on a value of k = 5 and R_K indicates the number of storage placements in memory 15 allocated for one!&gt; eyelet.

<td>Nozzle · number ”.</td><td></td><td>Mod N</td><td>x 7</td><td>4N</td>

<td> 1</td><td> 5 ·</td><td> 1</td><td> 35</td><td>or. :</td>

<td> 2 .</td><td> 10</td><td> 2</td><td> 70</td><td></td>

<td> 3</td><td> 15</td><td> 3</td><td> 105.</td><td> 105</td>

<td> 4</td><td> 20</td><td> 4</td><td> 140</td><td> 210</td>

<td> 5</td><td> 25</td><td> '·. 5</td><td> 175</td><td> 350</td>

<td> 6</td><td> 30</td><td> ' 6</td><td> 210</td><td> 525</td>

<td> .7</td><td> 35</td><td> 7 .</td><td> 245</td><td> 735</td>

<td> 8</td><td> • 40</td><td> 8</td><td> 280</td><td> 980 .</td>

<td>The</td><td>remaining</td><td>values ​​before</td><td>described</td><td>they are proportionate</td>

operated by the circuits previously described. The values ​​of Mod N and 4N can be stored in a memory only for reading in setpoints corresponding to the values ​​of nozzle numbers that are provided by the circuits described above. Although a computer device programmed for general use for the multiple setpoint generator 18 can be used, a more desirable choice would be that of strong electrical installation logic circuits to perform the function des30

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crita, since the required calculation speed would be achieved, with greater ease and economy.

The graphs and the table in Figure 10 illustrate the different chronological relationships and the succession of - 'phenomena occurred in the circuits described above. Figure A illustrates several cycles in the line and drum timing signals. Graphs B and C illustrate read / write sequences for random access memories (RAM) 42 and 43. Chart D illustrates a single period of line synchronization and chart E illustrates the fifty-six periods of cycle chronological regulation that occur in it. The table immediately below graph E graphically illustrates the appearance of different values ​​during the different cycles of the cycle chronological regulation sequence. The indicated sequences are repeated. The number of words goes from 0 to, 6 and is repeated. It ends in 6 in the 56 ° cycle of the chronological cycle controller. The number of nozzles remains.

for seven cycles and increases by 1 where it remains for seven cycles. After that it increases by 3 and increases every seven cycles; 'The number of lines increases in line synchronization and remains at this value until the next line synchronization. The graph 3? it shows a single cycle of the cycle-chronological regulator and the graph G shows the chronological data regulator during this cycle.

PHoJa no.