US3697958A - Font selecting system - Google Patents

Font selecting system Download PDF

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US3697958A
US3697958A US887537A US3697958DA US3697958A US 3697958 A US3697958 A US 3697958A US 887537 A US887537 A US 887537A US 3697958D A US3697958D A US 3697958DA US 3697958 A US3697958 A US 3697958A
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font
characters
character
type
printing
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US887537A
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John J Larew
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Genicom Corp
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General Electric Co
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    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K15/00—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers
    • G06K15/02—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers using printers
    • G06K15/08—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers using printers by flight printing with type font moving in the direction of the printed line, e.g. chain printers

Definitions

  • ABSTRACT Characters to be printed by a multiple font priming apparatus are represented by discrete numbers, and the printable characters on the apparatus are 22 Claims, 3 Drawing Figures PARALLEL 1O COMPARATOR 45 COLLNN DECCDER PATENTED 10 $972 SHEET 1 (IF 2 FINGER COUNTER COLUMN DECODER Cl C2 C40 C80 STORE 8 DRIVE COMPARATOR DATA INPUT 47/ HAMMER m m mm Nm T mm M m M L W2. w m J. I N 2 H m 11% 4 Dn m w O R L O m I mm mm 8 M N U GN R 7 A m S m M 7 P I.
  • the present invention relates to print selection systems for printers; and, more particularly, it relates to improved print selection systems for printers having a plurality of selectable fonts of characters.
  • the present invention is concerned with apparatus of the type for use in printing either a portion or an entire line at a time in response to signals received from a remote location.
  • Such systems may include those responsive to manual keyboards and those responsive to more complex information handling units such as computers.
  • printers, photocomposing apparatus, and the like which have the capacity for storing large numbers of selectable characters.
  • By employing rapidly moving cylinders or belts with the character forming elements disposed on the surface thereof it is possible to print entire lines across a record medium within the time required for a single cycling of such units.
  • a signal discretely representative of that character is presented to and stored by the printing apparatus. Subsequently, when the corresponding character forming element is in the appropriate position, the apparatus is actuated and the character is printed.
  • the present invention is particularly compatible with the apparatus of the type disclosed in the copending US. Pat. application Ser. No. 9l,l60 filed Nov. 19, 1970, which is a full continuation of Ser. No. 734,501 which was filed June 4, I968 by Earle B. McDowell and Clifford M. Jones, and assigned to the General Electric Company.
  • the aforementioned patent application discloses an improvement over conventional line printing. It includes a data storage unit which stores less than all of the data received for an entire line; and yet accomplishes the printing of an entire line within a predetermined interval of time.
  • One particular embodiment utilizes a type-carrying belt having a number of flexible arms, each of which has the type face for a particular character on one end thereof.
  • the type-carrying belt is mounted upon drive devices which rotate about parallel axes in order to effect passage of the belt between the recording medium and a plurality of hammers that are disposed across the face of the recording medium along the line to be printed.
  • the position of each character relative to a fixed point on the printer is determined by detecting the passage of a particular character past that point, and thereafter triggering a counting mechanism at a rate proportional to the rate of character movement.
  • the recording medium may be considered to comprise a plurality of distinct columns, each of which is a possible character position. Each character is represented by a discrete number and the numbers corresponding to characters to be printed are stored as input data.
  • circuitry compares the column position with the stored input data to determine whether or not a character is to be printed at that particular position. When the comparison indicates coincidence between the position of the character on the belt and the character to be printed in that position, the hammer of that column position is actuated and impacts the type face on the recording medium.
  • a binary counter is employed which is synchronized with the belt movement and registers successive integers at the same rate as that at which the characters pass suc cessive columns.
  • the integer registered in the counter at any particular time is the representative number of the character located at a predetermined column position at that time, and is used in conjunction with the input date to develop a control signal for actuating the appropriate hammer at an appropriate time to print selected characters in the desired column.
  • the present invention relates to a printing system wherein preselected signals are utilized for effecting a change of font.
  • a particular embodiment of the invention operates in conjunction with belt printers wherein the belt contains at least two fonts of characters which are continuously presented to all possible printing positions on a recording medium.
  • the particular font currently being presented to the recording medium is indicated discretely and the particular font desired to be utilized is indicated discretely such that comparison of these discrete indications controls the actual character printing operation.
  • Another object of the invention is to provide an improved method for shifting from a first to a second font of printing data responsive to remotely generated signals.
  • Another object of the present invention is to provide a multiple font printing system wherein all characters received following the receipt of a particular signal will be printed from the font indicated thereby.
  • a font selection system for a multi-font printing apparatus operative to selectively print characters from one of a plurality of fonts in response to signals identifying the font and character desired, comprising means for storing data representative of the character to be printed, font selection means responsive to said font selection signals to discretely modify said stored date to indicate the appropriate font, means for generating data representative of the printable characters and their positions at any particular point in time, and comparison means for comparing said stored data with said generated data to control printing of the desired character.
  • FIG. 1 is a block diagram of a printer employing the font selection system of the present invention.
  • FIG. 2 is a more detailed block and schematic diagram of an embodiment of a font selection control system of the type contemplated by the present invention.
  • FIG. 3 is a block diagram of a communication terminal including a belt printer carrying two sets of characters or type fonts.
  • FIG. 1 illustrates a print control system for the type of printer described in detail in the aforecited patent application, Ser. No. 91,160. This figure appears as FIG. 5 in the cited patent application and is reproduced here as a particular example of a print selection system with which the font selection system of the present invention may be employed.
  • FIG. 5 illustrates a print selection system with which the font selection system of the present invention may be employed.
  • the illustrated system includes an input memory 43 which receives character commands as input data in the form of a number representing each character to be printed.
  • the input memory 43 stores the input character number for comparison with numbers representing characters on the printing belt.
  • Column counter and memory 44 registers a numerical indication of the desired column position of each of the input characters stored in input memory 43, and in synchronizer 45 controls storage and utilization of the data in units 43 and 44.
  • the input data provided to such an apparatus may generally be classified as either information to be printed on the record medium, e.g., printable characters such as alphanumeric characters, punctuation marks; or special command signals, e.g., non-printable characters such as carriage return, line feed, shift out, or shift in.
  • the special command signals are utilized to program the printed matter or to make the apparatus perform particular functions.
  • the present disclosure is primarily concerned with the command signals shift out" and shift in, which are utilized to select the particular font of characters to be printed. For purposes of discussion, one may consider use of the U.S.A. Standard Code for Information Interchange (ASCII), wherein binary numbers 1 through 32 represent the special commands or non-printable characters and binary numbers 33 through 126 represent printable characters.
  • ASCII Standard Code for Information Interchange
  • Finger counter 40 registers a number representing the character appearing at a predetermined position on the apparatus. This is a binary counter that is initially set to the number representing the first character of a font, upon receipt of a start of font signal that may be generated once for each complete revolution or cycle of the belt. The characters on the belt are located in accordance with the code used so that each successive character is represented by a number one integer greater than that of its predecessor. Accordingly, finger counter 40 is counted up by one integer each time a new character appears at said predetermined position and the number registered therein always represents the appropriate character.
  • Input memory 43 and column counter and memory 44 are each capable of storing data representing a predetermined number of characters and their desired position. This data is continuously circulated and recirculated for comparison with the number registered in finger counter 40 in order to detect the appropriate juxtaposition of the character on the belt and the desired column. When this is detected, printing is effected and the input data is erased and replaced with new data.
  • Ser. No. 9l,l60 the number registered in finger counter 40 and the number registered in column counter and memory 44 are applied to an adder 41 which arithmetically adds the numbers, character by character, serially, to produce a summation signal for comparison with the character number stored in input memory 43.
  • a distinct summation signal is produced for each column number that is added to a particular finger count number, and each summation signal effectively provides character position information relating a particular character to a particular column position.
  • Comparator 42 serially compares one character at a time at a rate sufficiently high to effect comparison of all of the data characters stored in the circulating input memory 43 during the time it takes for a character on the belt to pass from any given column to an adjacent column. Upon detecting correspondence, a signal is generated and forwarded to the column decoder 46 which, in conjunction with an indication from the column counter and memory 44, causes the appropriate hammer on the print mechanismto print the desired character.
  • input information in the form of an input character number from a keyboard or from a tape reader or an external source is applied to an input memory 43 over the DATA INPUT line.
  • lnput memory 43 stores the numerical representation of each of the input characters comprising the input information.
  • the write-in of characters into memory 43 is controlled by a write-in synchronizer 45. Synchronizer 45 is responsive to the presence of an input character at the input to memory 43 and the availability of a storage capacity at the input position of this memory.
  • synchronizer 45 alerts or strobes the input memory to receive the character and also a second memory 44 which receives a number from its counter which corresponds to the column in which the input character simultaneously received is to be printed.
  • Another source of information to the system is over line 34, as from a photosensor as described in the aforementioned application, Ser. No. 734,500, which provides the stimulus to finger reference counter 40 to register a number corresponding to the print character at a reference position along the print line, e.g., the character adjacent column 1.
  • memory 43 receives and stores the information which is desired to be printed
  • memory 44 stores information indicating where the input information is to be printed
  • register 40 stores information indicating where the print characters are that must be actuated to print out the input information.
  • each number in the column indicating memory 44 is added in an adder 41 to the number indicating the reference print character seriatim to obtain a series of sums, each sum being a number representing the print character at the print position represented by the value of the column indicating number from memory 44.
  • finger counter 40 contains a number, such as 32, which is the value of the character about to align with column 1.
  • the numbers stored in memory 44 which indicate the columns in which the input characters are to be printed, may begin with the number 0 for the character to be printed in the first column, and for an eight character capacity, the numbers stored for the first eight input characters will extend from 0 through 7. Thus the value of the first sum, 32 0, will be 32. Thus the value of the print character which can be printed in column 1 is 32. Since the number for each print character is greater than the number of the succeeding print character by an integral increment, such as l in a preferred embodiment, and since the same integral increment separates the numbers accorded to adjacent columns, the number I will indicate the next column and it is added to the reference number 32 to produce the number 33 which reference is the number representing the character which can next be printed in column 2. It can be observed from the above example that the column indicating number zero" indicates the first column and the number one indicates the second column. This is a common practice where the system as here relies on binary numbers for its computation.
  • the series of sums produced by adder 41 are numbers representing the print characters which can next be printed at the columns indicated by the column number forming a part of each sum.
  • These print character numbers (the same) are compared by comparator 42 with the input character numbers in the input memory 43.
  • the comparison is on a bit-by-bit basis and is in synchronism with the circulation of memories 43 and 44 such that the sum which was produced by the column position number for the first input character is compared with the first input character number. If the print character approaching the first column has a number which compares with the input character number to be printed in the first column then there is a coincidence of numbers and an output is obtained from comparator 42.
  • comparator 42 The output of comparator 42 is applied to a column decoded 46 and also back to the input memory 43.
  • the feedback path to input memory 43 enables the input character which resulted in the finding of a printable character to be erased. This enables memory 43 to receive another input character in the space left.
  • the column decoder 46 receives the coincidence indicating signal from comparator 42. Column decoder 46 also receives seriatim the columns indicating numbers from memory 44 as they are applied to adder 4]. Thus, as each computation is being made in the adder and comparator 42, the channel of the column decoder 46 corresponding to the column position number applied to the adder is energized. Thus, for example, when the column 1 indicating number, zero, is being applied to the adder, the column 1 output channel C l of column decoder 46 is energized. If there is a coincidence detected by the comparator 42, then the print actuation means for channel 1 is energized. In FIG. 2 the print actuating means is shown as a block 47 for the column 40 position C40.
  • Block 47 represents a memory or store unit and a hammer drive.
  • the memory is provided for each of the columns such that all coincidence indications obtained for one examination of the contents of the input memory 43 will be stored so that for the one position of the print characters all hammers will be simultaneously actuated for all the printable characters located. This simultaneous printout results in random or nonsequential printout within the storage capacity of the memories 43 and 44.
  • N represents the input character number
  • F C represents the column indicating number, i.e., number indicating the column in which the corresponding input character is desired to be printed; and if F represents the number indicating font position, i.e., the number of the print character in the font at a reference column; then the computation that is performed by the print selection system shown in FIG. 2 can be expressed by the algorithm F C N
  • This algorithm for the system of FIG. 2 indicates that the number representing font position is summed with the number representing the column in which the input character is to be printed and compared with the input character numbers to detect equality.
  • FIG. 3 there are shown portions of the printing mechanism preferred for the printer in the system of FIG. 1.
  • a belt 1 supported and driven by pulleys 2 and 3.
  • the direction of the motion of the belt is indicated by arrows, in a counterclockwise direction.
  • Suitable pulley drive means such as a drive motor powers pulley 3 to provide the belt with a substantially constant speed drive.
  • the direction of movement of character belt 1 relative to a record medium 4 is such that it traverses a line or proposed line on the record medium.
  • the belt 1 supports a plurality of fonts of type characters or sets of type symbols, which for purposes of simplicity is shown to consist of a first font or set of type 5 and a second font or set of type 6.
  • Each font comprises a plurality of flexible fingers 7, each finger having on the uppermost face thereof a print character 8.
  • the motion of the belt is such that the print characters move parallel to the proposed print line in front of a typing or inking ribbon- 9 and a plurality of hammers 10.
  • a recording medium 4 such as a piece of paper 4 is shown being supported against a platen or roller 30 for being driven in the vertical direction.
  • Ink ribbon 9 passes between the paper and the print character bearing fingers.
  • the hammers 10 when actuated by appropriate means such as solenoids strike the finger into the ribbon and thus into the paper.
  • the paper moves perpendicular to the print line as shown by the arrow and the print characters move from column to column parallel to the print line. Since the fingers 8 are embedded in the belt, which preferably is of a resilient plastic material such as polyurethane polymer, they are thus fixed in a predetermined order.
  • the belt 1 may carry several fonts of characters although only two fonts of characters are illustrated for simplicity.
  • a reset device 36 for applying a signal over lead 37 to counter 40 for resetting this counter at each indication of the beginning of a font of print characters.
  • a change in font may be generated in any one of a number of ways.
  • a wide finger is used to indicate a change of font.
  • the counter 40 is reset by reset means 36 when a wide finger such as 7A is sensed by photosensors l2, 13. Wide finger 7A is positioned in the fonts at a point to be detected by the photosensors when the first print character of one of the fonts is approaching the first column.
  • the count signals are applied over lead 34 and the change of font" signal over lead 37 to the finger counter 40.
  • FIG. 2 illustrates the elements of input memory 43 and finger counter 40 in somewhat more detail. In addition, it includes the storage and control elements employed in conjunction with the invention in order to control font selection and utilization.
  • the input memory 43 comprises a paralIel-to-serial shift register 50 and storage unit 52. These units are interconnected by lead 62, erase gate 51, lead 63 and lead 64. These interconnections permit the circulation of the contents of the memory in response to clock pulses (not shown).
  • Finger counter 40 is shown as having its output supplied to a parallel-to-serial shift register 53 and it is the output of this register which is serially presented to adder 41 for addition to the output of the column counter and memory 44.
  • the write-in synchronizer 4S and column counter and memory unit 44 are illustrated in the same manner as in FIG. 1.
  • a data input is shown supplying the printable character input data to input memory 43 via leads 61, and also supplying special command signals shift in SI) and shift out (SO) on leads 102 and 103 respectively.
  • data input 100 is a decoding unit which responds to the input data information and forwards data for the printable characters to the input memory while forwarding the special command data to the appropriate portions of the control apparatus.
  • the SI signal indicates that the primary font is to be employed for subsequently received characters and the SO signal indicates that the secondary font is to be employed for the subsequently received characters.
  • a font selection flip-flop 101 is set.
  • the set" output from font selection flip-flop 102 over lead 104 sets an eighth stage of the paralIel-to-serial shift register 50. Accordingly, when the eighth parallel-to-serial shift register is in a one" state, it is indicative of the fact that the SI signal has been received and the primary font should be used. When it is desired to employ the second font, the SO signal is transmitted and this operates over lead 103 to reset the font selection flipflop 101. The reset output of flip-flop 101 places the eighth stage of the shift register 50in a zero state.
  • the font selection flip-flop 101 discretely modifies the character input data to indicate the desired font. It is also necessary to identify the fonts in printing position at any point in time. Attention is directed to the upper right quadrant of the figure where a second font flip-flop 110 is illustrated. Finger counter 40 is operative in response to count signals upon lead 34 to indicate the number representative of the character appearing at a predetermined column position. When utilizing the ASCII mentioned above, wherein the first 33 characters (including are not printing characters, finger counter 40 begins with a count of 33 upon receipt of a start font signal on lead 37. Thereafter, for each pulse received over lead 34, the finger counter counts up until it reaches a count of 126, at which time it automatically resets to 33.
  • second font flip-flop 110 is to modify the finger counter output in order to indicate which font is in position for printing. This is effected by setting the second font flip-flop when the finger counter reaches a count indicative of the termination of the first font, i.e., upon reaching a count of 126.
  • each font was identified by the generation of a special font start signal in response to detection of a special geometrical configuration on the finger starting each font. In accordance with the present invention, this is not necessary. Rather, when the finger counter 40 registers the number representing the last character of a font, it is automatically reset via lead 111 and simultaneously transmits a set signal over lead 112 to the set input of the second font flip-flop 110. Thus, when flip-flop 110 is in a set condition it is indicative of the fact that the second font is available for printing.
  • flip-flop 110 Upon being set, flip-flop 110 sets the eighth bit of paralleLto-serial shift register 53 via lead 113 in the same manner as was done in the parallel-to-serial shift register 50 of the input memory 43.
  • the data indicative of the characters in printing position has been modified to reflect font position in the same manner as the input character data has been modified.
  • comparator 42 When comparison is subsequently effected in comparator 42, only the character in the appropriate font will cause coincidence and generate the necessary hammer drive signal ultimately applied to storage and hammer drive unit 47.
  • the present invention has been described and illustrated with particular reference to a belt-type partial line-at-a-time printing system.
  • the invention itself is not restricted to this particular type of printing apparatus.
  • drum-type printing units may partake of the advantages of the present invention.
  • all applications of the invention will not be wedded to the utilization of binary counting devices and the like.
  • the basic principles of the invention are applicable to other techniques utilizing other storage arrangements and other basic control systems.
  • a font selection system for multi-font printing apparatus operative to selectively print characters from one of a plurality of fonts in response to signals identifying the font and character desired, comprising: means for storing data representative of the character to be printed at particular positions along a print line, font selection means responsive to said font identifying signals to supplement said stored data to indicate the appropriate font, means for generating data representative of the selectively printable characters and their positions along said print line at any particular point in time, and comparison means for comparing said stored data with said generated data to control printing of the desired character and font.
  • each character is represented by a discrete number
  • said means for storing data comprising means for storing numbers corresponding to the character to be printed
  • said font selection means comprising means for adding a predetermined number to each stored number
  • a font selection system wherein the data representative of each of said characters is represented by a discrete number; means for cyclically presenting the characters in said fonts to all potential printing positions on a recording medium; said means for generating data representative of the printable characters and their positions comprising means for cyclically generating numbers corresponding to the character presented at a particular position with time; a source of an initiation signal; means for commencing the cycle of said number generation in response to said initiation signal and means for thereafter reinstituting said cycle of number generation upon the generation of a particular number by said generating means.
  • a font selection system including means operative in response to said reinstitution of the cycle of number generation to add a predetermined number to each number generated during the succeeding cycle.
  • a font selection system wherein said data input storage comprises means for storing numbers corresponding to the character to be printed at a particular position along a print line, and said font selection means comprises means for adding said predetermined number to each stored number.
  • each character is represented by a discrete number
  • said data input storage comprises means for storing numbers corresponding to the character to be printed at a particular position along a print line
  • said font selection means comprising means for modifying the numbers stored.
  • a font selection system as defined in claim 8 further comprising means for generating a signal at the beginning of a first font, means for initially setting said binary counter by said signal generated at the beginning of a first font to a number representative of the character whose type-face appears at a predetermined location relative to the record medium. and means thereafter for modifying the content of said binary counter as successive type-faces appear at said location to represent the character thereof; and means for automatically resetting said counter to said number at the end of said first font.
  • said additional means comprises a flip-flop responsive to said automatic resetting of said counter to add said predetermined number to each successive output of the counter until the end of the second font of characters occurs.
  • a multifont printing apparatus operative to selectively print characters from one of a plurality of fonts of printable characters carried on a carrier across a printing surface in response to signals identifying the font and character desired, comprising: means for storing data representative of the character to be printed, font selection means responsive to said font identifying signals indicating a change in font to modify said stored data to indicate the appropriate font, means for generating data representative of the printable characters on said carrier and their positions at any particular point in time, and comparison means for comparing said stored data with said generated data to control printing of the desired character and font.
  • each character is represented by a discrete number
  • said data input storage comprises means for storing numbers corresponding to the character to be printed
  • said font selection means comprising means for adding a predetermined number to each stored number
  • a font selection system wherein the data representative of each of said characters is represented by a discrete number; means for cyclically presenting the characters in said fonts to all potential printing positions on a recording medium; said means for generating data representative of the printable characters and their positions comprising means for cyclically generating numbers corresponding to the character presented at a articular position with time; a source of an initiation signal movement of a given font of printable characters on the carrier to a predetermined location with respect to said printing surface; means for commencing the cycle of said number generation in response to said initiation signal and means for thereafter reinstituting said cycle of number generation upon the generation of a particular number by said generating means.
  • a font selection system including means operative in response to said reinstitution of the cycle of number generation to add a predetermined number to each number generated dur ing the succeeding cycle.
  • a font selection system wherein said data input storage comprises means for storing numbers corresponding to the character to be printed, and said font selection means comprises means for adding said predetermined number to each stored number.
  • a font selection system as defined in claim 17 further comprising means for generating a signal at the beginning of a first font, means for initially setting said binary counter by said signal generated at the beginning of a first font to a number representative of the character whose type-face appears at a predetermined location relative to the record medium, and means thereafter for modifying the content of said binary counter as successive type-faces appear at said location to represent the character thereof; and means for automatically resetting said counter to said number at the end of said first font.
  • a font selection system as defined in claim 18 wherein said additional means comprises a flip-flop responsive to said automatic resetting of said counter to add said predetermined number to each successive output of the counter until the end of the second font of characters occurs.
  • a printer which moves a plurality of fonts of type characters successively into printing position relative to a print line on a document for selectively effecting printing on the document by the type characters, a first recirculating memory for storing first coded representations of input characters to be printed on the document, a second recirculating memory for storing second coded representations of the columnar addresses corresponding to the print columns in which said input characters are to be printed, means for at gesired columnar addresses in desired fonas.
  • said means for modifying said third coded representations comprises means for producing a first control signal representative of a first font moving into printing position, means for modifying said third coded representations in response to said first control signal, means for counting each of the type characters included in said first font to derive a sum signal, and means responsive to said sum signal for modifying said third coded representations to indicate a change in font.
  • a system for selectively printing characters from a pair of sets of type characters which are moved in a predetermined sequence along a print line comprising means for storing data representative of characters desired to be printed at particular positions along a print line and data representative of the particular set of type selected from said sets of type to be associated with each of said last-named characters, means for generating first signals representative of the successive positions of movement of each of said type characters in said sets of type characters moving along said print line and a second signal representing movement of the beginning of one of said sets of type characters to a predetermined position with respect to a reference position, a counter, means for establishing a first count in said counter in response to said second signal, means for causing said counter to count to a second count in response to the pas-age of said type characters of said one of said sets'of type to successive positions along said print line, means responsive to said second count counted in said counter for establishing said first count in said counter, means for causing said counter to count to a third count in response to the passage of said type characters of the other of

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Cited By (9)

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US3827357A (en) * 1973-09-12 1974-08-06 Sperry Rand Corp On-the-fly printer with shortened print cycle
US3855923A (en) * 1973-06-29 1974-12-24 J Foley Print control system for high speed printers
US3944989A (en) * 1972-11-17 1976-03-16 Takachiho Koeki Kabushiki Kaisha Pattern information memory using circulating memories
US4000486A (en) * 1973-10-23 1976-12-28 International Business Machines Corporation Full page, raster scan, proportional space character generator
US4063029A (en) * 1975-09-29 1977-12-13 Siemens Aktiengesellschaft Arrangement for effecting a variable modification of information used to control a printer unit of a teleprinter
US4144560A (en) * 1974-12-20 1979-03-13 General Electric Company Adaptive control for signal processing
US4152981A (en) * 1977-06-03 1979-05-08 Computer Peripherals, Inc. Dual pitch impact printing mechanism and method
US4327421A (en) * 1976-05-13 1982-04-27 Transtech International Corporation Chinese printing system
US4457229A (en) * 1982-12-27 1984-07-03 International Business Machines Corporation Scan correction for a line printer having multi-pitch type carriers

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DE2062384A1 (de) 1971-07-01
FR2074210A5 (enExample) 1971-10-01
GB1274620A (en) 1972-05-17

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