EP0290219A2 - Vorrichtung zum Steuern der Wagenbewegung in einem Drucker - Google Patents

Vorrichtung zum Steuern der Wagenbewegung in einem Drucker Download PDF

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Publication number
EP0290219A2
EP0290219A2 EP88303981A EP88303981A EP0290219A2 EP 0290219 A2 EP0290219 A2 EP 0290219A2 EP 88303981 A EP88303981 A EP 88303981A EP 88303981 A EP88303981 A EP 88303981A EP 0290219 A2 EP0290219 A2 EP 0290219A2
Authority
EP
European Patent Office
Prior art keywords
print
carriage
printing
line
printing apparatus
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP88303981A
Other languages
English (en)
French (fr)
Other versions
EP0290219B1 (de
EP0290219A3 (en
Inventor
Ryoichi C/O Brother Kogyo Kabushiki Kaisha Sasaki
Youji C/O Brother Kogyo Kabushiki Kaisha Sata
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Brother Industries Ltd
Original Assignee
Brother Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP62109589A external-priority patent/JPS63274575A/ja
Priority claimed from JP62121550A external-priority patent/JPS63286378A/ja
Application filed by Brother Industries Ltd filed Critical Brother Industries Ltd
Publication of EP0290219A2 publication Critical patent/EP0290219A2/de
Publication of EP0290219A3 publication Critical patent/EP0290219A3/en
Application granted granted Critical
Publication of EP0290219B1 publication Critical patent/EP0290219B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J19/00—Character- or line-spacing mechanisms
    • B41J19/18—Character-spacing or back-spacing mechanisms; Carriage return or release devices therefor
    • B41J19/20—Positive-feed character-spacing mechanisms
    • B41J19/202—Drive control means for carriage movement

Definitions

  • the present invention relates to a printing apparatus capable of printing in both directions on a print line basis, and specifically relates to a printing apparatus wherein when printing a document on a plurality of print lines, intervals between characters on each print line are kept constant, for instance on resumption of printing after printing has been suspended.
  • some of printing apparatuses such as electronic typewriters and printers are constituted so as to print, when print data sent from an external apparatus is printed on a plurality of print lines, in one direction from the left margin position to the right margin position, and some of printing apparatuses are constituted so as to print in both the right direction and the left direction to improve the printing speed.
  • a print paper is fed by an amount of line space by a line feed processing, and subsequently, the carriage is moved to the right end print position Rp, and the line end character is printed on the right end print position Rp, and thereafter the control is performed so that printing is made on the succeeding print line S while the carriage is moved sequentially in the left direction.
  • the character interval between the end character and the character succeeding the end character becomes smaller than the character interval between other characters due to elongation of a wire or belt and backlash of gears of the driving means for driving the carriage, and therefore the character intervals are not kept constant on the same print line, and positional deviation of printed characters takes place also between the preceding and succeeding print lines, and thus a problem exists.
  • a first object of the present invention is to provide a printing apparatus capable of keeping intervals between printed characters on each print line constant when printing in both directions is performed across a plurality of print lines, by means of regulating positional errors of the carriage due to backlash of gears and elongation of a wire or belt of the carriage driving means.
  • a second object of the present invention is to present a printing apparatus capable of preventing variation of character intervals when resuming printing, by regulating positional errors of the carriage before resuming printing.
  • the present invention provides a printing apparatus having memory means for storing code data of characters to be printed so as to correspond to each print position; printing means having a print head mounted on a carriage; carriage driving means for driving the carriage movable along a print line for printing characters corresponding to code data in the memory means on a print paper; print direction control means for controlling the carriage driving means to move the carriage forward or backward while printing along each print line so that the carriage moves along a shortest path; judging means for judging according to data in the memory means whether or not theprint end position of a present print line is located between the print start position and the print end position of the succeeding print line in the carriage driving direction;control means controlling the carriage driving means to move the carriage, when the print end position of the present print line is located between the print start position and the print end position of the succeeding print line, to a preceding print position which precedes said print start position in the print direction of the succeeding print line and subsequently to move the carriage to the print start position.
  • the second aspect of the present invention provides a printing apparatus having memory means for storing code data of characters to be printed so as to correspond to each print position; printing means having a print head mounted on a carriage; carriage driving means for driving the carriage along a print line for printing characters and symbols corresponding to code data in the memory means on a print paper; print direction control means for controlling the carriage driving means to move the carriage forward or backward while printing along each print line so that the carriage moves along a shortest path; original position setting means for setting an original position of the carriage at one movement limit position ; print suspending means for controlling the printing means to suspend printing according to a suspension command signal; print resuming means for controlling the carriage driving means to move the carriage, when the print suspending means is released, to a print resuming position where printing is to be resumed, after setting the carriage to the original position by the original position setting means; regulating means for regulating backlash in the carriage driving means before resuming printing, when the moving direction of the carriage in moving from the movement limit position to the print resuming position
  • the printing means is controlled so as to make printing in both directions while the carriage is moved forward and backward on a print line basis.
  • the controlling means moves the carriage to the preceding print position side from the print start position of the succeeding print line, with the print direction of the succeeding print line taken as a reference, after printing of the present print line has been completed, and thereafter moves the carriage to the print start position of the succeeding print line.
  • the original position of the carriage is set before printing.
  • the printing means is controlled so as to make printing in both directions while moving the carriage forward and backward on a print line basis.
  • the original position of the carriage is set by the original position setting means, and thereafter the print resuming means returns the carriage to the succeeding print position. Then, where the moving direction of the carriage when returning to the succeeding print position is reverse to the succeeding print direction, a positional error of the carriage due to backlash and extension of wire or belt is corrected by the regulating means before resuming the printing.
  • Irregular intervals between printed characters when resuming the printing can be prevented and thereby accurate printing can be performed irrespective of the succeeding print direction.
  • This embodiment is of the case where the present invention is applied to an electronic typewriter.
  • a keyboard 3 is disposed in the front part of a main frame 2 of an electronic typewriter 1, and a printing mechanism PM is installed behind the keyboard 3 in the main frame 2, and a one-line liquid crystal display 75 for displaying inputted characters and symbols is installed in the rear part of the keyboard 3.
  • character keys 10 including alphabet keys, numeral keys and symbol keys, a print start key 11 for printing text data of a text memory 52, a return key 12 and other various function keys 13, 14 are installed as on normal typewriters.
  • the printing mechanism PM is provided with at least a platen 20 for feeding a print paper 15, a line feed motor 89 for driving it and a line feed drive circuit 89a, a carriage 22 supported by a guide 21 parallel with the platen 20, a carriage drive motor 90 for driving the carriage 22 right and left in a reciprocating fashion and a carriage drive circuit 90a, a typewheel 24 housed in a wheel cassette 23 and a typewheel drive motor 96 for driving it and a typewheel drive circuit 96a, a print ribbon 26 stored in a ribbon cassette 25 and a ribbon drive motor 97 for taking-up it and a ribbon drive circuit 97a, a print hammer for hammering a type element 27 of the typewheel 24 and a hammer solenoid 28 for driving it and a hammer drive circuit 28a, a ribbon change-over mechanism selectively disposing the print ribbon 26 or a correction ribbon 29 at the print position, and this printing mechanism PM is similar to the printing mechanism of normal
  • the carriage 22 is driven so as to reciprocate forward and backward along a print line on the print paper 15 by means of a well-known carriage driving means CM disclosed, for example, in U.S. Pat. No. 4,044,882.
  • This carriage driving means CM comprises a carriage drive motor 90 installed near a left-side wall of the frame 2, a driving gear 91 on a motor-shaft of the motor 90, a transmitting gear 92 engaged with the driving gear 91, a driving pulley 93 formed integrally with the gear 92, a driven pulley (not shown) installed near a right-side wall of the frame 2, and a wire 94 which is engaged with two pulleys and fixed to the carriage 22 at both ends.
  • the electronic typewriter 1 is constituted with the key board 3, the printing mechanism PM, a displaying mechanism D, a controlling apparatus C, and the keyboard 3, the printing mechanism PM and the displaying mechanism D are connected to a main CPU (Central Processing Unit) 30 of the controlling apparatus C through a bus 31 including data bus and address bus.
  • a main CPU Central Processing Unit
  • the controlling apparatus C is constituted with the main CPU 30, a ROM (Read Only Memory) 40 and a RAM (Random Access Memory) 50 connected to the CPU 30 through the bus 31.
  • a program memory 41 of the ROM 40 stores a control program for controlling the printing mechanism PM and the displaying mechanism D in correspondence to code data inputted from each character key 10 and each function key 13, 14 on the keyboard 3, a control program for controlling printing in both directions as described later.
  • the RAM 50 is provided with a present position memory 51 for sequentially renewing and storing the present position of a print head 27a of the carriage 22 from the absolute origin in correspondence to the print position, a printed data memory 55 for sequentially storing about 500 characters of data such as characters printed in the typewriter mode in correspondence to the print position, an input buffer 56 for storing data such as characters which are inputted from the keyboard 3 or read from a text memory 52 in the memory mode (display mode), the text memory 52 for storing inputted data as file data, a cursor display position counter 57 for counting the cursor display position in response to a movement of the cursor in correspondence to each display position of the display 75, a cursor position pointer 58 for pointing address of the input buffer 56 corresponding to data of the cursor display position counter 57, a print direction flag 53 which is set when printing is made in the right direction (forward direction) and is reset when printing is made in the left direction (backward direction) in printing text data of the text memory 52, a print buffer 54 for sequentially reading text data
  • the text memory 52 stores an EOT (End of Text) code following the last data of text data.
  • the main CPU 30 makes the printing mechanism PM print a character or symbol corresponding to the data inputted from each character key 10 based on the control program, and makes the printed data memory 55 store the printed data in sequence in correspondence to the print position. Furthermore, in the memory mode, the main CPU 30 makes the input buffer 56 store the inputted data of one print line, makes the display 75 display that data, and makes the text memory 52 store that data of one print line in response to an operation of the return key 12.
  • the displaying mechanism D is constituted with an interface 70, a CPU 71 for display, a character generator 72, a display controller 73, and the liquid crystal display 75, and the connection thereof is as shown in the diagram.
  • the displaying mechanism D is similar to the publicly known mechanism, and does not relate directly to the present invention, and therefore description thereon is omitted.
  • a line segment F shows a character string printed on a preceding line
  • a line segment S shows a character string printed on a succeeding line.
  • Symbol Ep designates the last print position of the preceding print line
  • symbol Lp designates the left end print position (line-head print position) of the succeeding print line
  • symbol Rp designates the right end print position (line-end print position) of the succeeding print line
  • a dotted line shows print paper feed
  • an arrow " ⁇ ” shows movement of the carriage 22 in the right direction
  • an arrow " ⁇ ” shows movement of the carriage 22 in the left direction.
  • step S1 (hereinafter represented simply by S1, and the same is true of the other steps), and initialization is executed in such a manner that the print direction flag 53 is set to print characters on the preceding line in the right direction (print direction flag data "1") and so on, and in S2, the typewriter 1 is ready for a key-input.
  • processing proceeds to S3.
  • S7 data to be printed next is read from the print buffer 54.
  • S8 judgment is made on whether or not that data is end data (EOT code), and if it is not the EOT code, processing proceeds to S9.
  • S9 judgment is made on whether or not that data is the last data of line, that is, data preceding by one character before return code, and if NO, processing returns to S6.
  • S6 - S9 are repeated, and for example, when printing is made up to data preceding by one character before the last print position Ep of the line segment F as shown in Fig. 4 (a) through (j), judgment is made to be YES, and processing proceeds to S10.
  • the last data of print line is printed on the last print position Ep.
  • the print head 27a is located at the last print position Ep.
  • S11 text data of the following one print line is read from the text memory 52, being written to the print buffer 54.
  • S12 according to data of the present position memory 51, data of the print buffer 54 and data of the pitch memory 60, the left end print position Lp and the right end print position Rp of the line segment S in the succeeding print line are evaluated by arithmetic operation, and judgment is made on whether or not the last print position Ep is located between the left end print position Lp and the right end print position Rp, and if the judgment is YES, positional errors due to backlash and wire elongation of the driving means driving the carriage 22 is required to be regulated, and therefore processing proceeds to S13. For example, as shown in Fig. 4 (b) and (e), the last print position Ep is located between the left end print position Lp and the right end print position Rp of the line segment S.
  • the print head 27a (i.e. the carriage 22) is moved to the print position higher by one character (in the direction of left margin) than the left end position Lp.
  • line feed processing is performed which feeds the print paper 15 by an amount of a set line space.
  • the print head 27a is moved to the left end print position Lp (refer to Fig. 4(e)).
  • the print head 27a is moved to the print position lower by one character (in the direction of right margin) than the right end print position Rp.
  • line feed processing is performed which feeds the print paper 15 by an amount of a set line space.
  • the print head 27a is moved to the right end print position Rp (refer to Fig. 4(b)).
  • judgment is made on whether or not the preceding print has been made in the right direction, and if it has been made in the right direction, processing proceeds to the above-­mentioned S18, and if in the left direction, processing returns to S6.
  • control of printing in both directions is performed including regulation of positional errors of the carriage 22 through S6 - S18
  • control of printing in both directions is performed including correction of positional errors of the carriage 22 through S6 - S13 and S19 - S22.
  • control of printing in both directions is performed without regulation of positional errors of the carriage 22 through S6 - S12, S23 and S15 - S18
  • control of printing in both directions is performed without regulation of positional errors due to backlash and wire elongation of the driving means of the carriage 22 through S6 - S12, S23 and S20 - S22.
  • processing proceeds to S25, and alarm processing such as buzzer sounding is performed, and processing returns to S2.
  • processing proceeds to S26, and the processing corresponding to the operated key is executed, and processing returns to S2.
  • each character to be printed on each print line is printed by moving the carriage 22 in the same direction. This means that the intervals between characters on the same line are kept constant and thereby beautiful print of document can be performed.
  • the print head 27a in order to regulate positional errors caused by a play of gears or elongation of a wire in the driving means of the carriage 22, when the print head 27a is moved, the print head 27a is moved by an amount with one extra character and thereafter moved back by one character to the normal position, but the extra amount of movement is not limited to one character, and in short, the amount of movement has only to be enough to regulate the positional errors in the carriage driving system.
  • a control routine of printing in both directions in the first embodiment is modified partly as shown in Fig. 5, and when the printing direction is reversed after the above-described regulation of positional errors has been made, the amount of rotation of the carriage drive motor 90, that is, the amount of correction of backlash and wire elongation is controlled so that the print position of each character to be printed in the left direction (or right direction) corresponds to the print position of each character to be printed in the right direction (or left direction).
  • the carriage drive motor 90 is driven to make reverse rotation by an amount of rotation of the carriage drive motor 90 during which the carriage 22 is not moved actually despite the rotation of the carriage drive motor 90 (amount of regulation of the positional errors), and the print head 27a is moved in the left direction by a predetermined distance, and processing proceeds to S6.
  • characters can be printed on predetermined positions without apparent deviation on all print lines.
  • the amount of regulation of the positional errors may be obtained by measuring the distance of actual positional deviation, being stored in the ROM 40 as data, or may be arbitrarily set by the operator.
  • control routines of printing in both directions are not limited to the flow charts as shown in Figs. 3(a) to 3(c) and Fig. 5, but they may be modified partly to routines as shown in Fig. 6 (a) and (b).
  • This second embodiment is an embodiment in the case where the present invention is applied to a typewriter like the electronic typewriter 1 in the above-mentioned first embodiment, and therefore description thereon is made using the same numerals and symbols for designating the elements having the same function as that of the electronic typewriter 1 of the above-mentioned first embodiment.
  • the electronic typewriter 1 is constituted with the keyboard 3, the printing mechanism PM, the displaying mechanism D, the controlling apparatus CA, and the keyboard 3, the printing mechanism PM and the displaying mechanism D are connected to the CPU (Central Processing Unit) 130 of the controlling apparatus CA through a bus 131 including data bus and address bus.
  • CPU Central Processing Unit
  • a cover switch 80 for detecting the state of opening and closing of the cover 4 for shutting the top opening part of a space wherein the carriage 22 moves is connected by a connecting wire 81, and the other end of the cover switch 80 is grounded, and the intermediate part of the connecting wire 81 is connected to a 5V reference voltage line Vc through a pull-up resistor 82.
  • the controlling apparatus CA is constituted with the CPU 130, the ROM (Read Only Memory) 140 and the RAM (Random Access Memory) 150 connected to the CPU 130 through the bus 131.
  • a program memory 41A of the ROM 140 stores in advance a control program for controlling the printing mechanism PM and the displaying mechanism D in correspondence to code data inputted from each character key 10 and various function keys 13, 14 on the keyboard 3, a control program for setting the original positions of the typewheel 24 and the carriage 22 in the state that the carriage 22 is brought in contact with a stopper 95 in the vicinity of the left-side wall of the frame 2, a printing control program for making printing in both directions while the carriage 22 is moved forward and backward on a print line basis, a control program for controlling correction of the backlash and wire elongation as described later, and the like.
  • the RAM 150 is provided with the present position memory 151 for sequentially renewing and storing the present position of the carriage 22 (i.e. the present position of the print head 27a) from the absolute origin in correspondence to the print position, a key buffer 162 for temporarily storing data which is inputted from the keyboard 3 or is read from the text memory 152, a line buffer 160 for storing data of at least one print line from the key buffer 162 or the text memory 152 in correspondence to the print position, a relocation position memory 161 for storing data of the last print position, the print direction flag 153 which is set when the print direction is right and is reset when the print direction is left in printing text data of the text memory 152.
  • the present position memory 151 for sequentially renewing and storing the present position of the carriage 22 (i.e. the present position of the print head 27a) from the absolute origin in correspondence to the print position
  • a key buffer 162 for temporarily storing data which is inputted from the keyboard 3 or is read from the text memory 152
  • a line buffer 160 for
  • the text memory 152 stores EOT (End of Text) code following the last data thereof.
  • the CPU 130 makes the printing mechanism PM print characters and symbols corresponding to data inputted from each character key 10, and simultaneously makes the line buffer 160 sequentially store that data in correspondence to the print position based on the control program in the typewriter mode. Furthermore, in the memory mode, the CPU 130 makes the line buffer 160 store inputted data of one print line, and simultaneously makes the displaying mechanism D display it, and makes the text memory 153 store that one line of data in response to an operation of the return key 12.
  • the displaying mechanism D has a general configuration comprising the display 75 consisting of a liquid crystal displaying apparatus and a display controller 73A outputting a drive signal to the display 75.
  • an area that is, a name of file storing desired text data to be printed is specified by operating the character key 10 and function keys 13, 14. Then, when the print start key 11 is operated to print the inputted data stored in the text memory 152, the main routine is started, and processing proceeds to step 1 (hereinafter represented simply as S1, and the same is true of the other steps), and judgment is made on whether or not the character data to be printed is stored in the specified file of the text memory 152, and if the judgment is YES, processing proceeds to S2, and if the judgment is NO, processing proceeds to S3, and alarms the operator by a buzzer, returning to the main routine.
  • step 1 hereinafter represented simply as S1
  • S2 text data of one print line stored in the text memory 152 is written to the line buffer 160, and processing proceeds to S4.
  • whether or not the cover 4 is opened is judged based on an open/close signal from the cover switch 80, and if the judgment is NO, that is, when the "L"-level signal is given, processing proceeds to S5, and text data of one character is read from the line buffer 160, and processing proceeds to S6.
  • the text data of the line buffer 160 is printed in sequence, and when the data of line end is printed, the line end code data is read from the line buffer 160, and if the judgment results in YES, processing returns to S2. Then, the following text data of one print line is stored in the line buffer 160, and S4-S10 are repeated likewise the above-mentioned, and the text data is printed in sequence.
  • the print direction flag 153 is changed-­over from set to reset or from reset to set, and thereby the print direction is reversed.
  • the original position of the carriage 22 is set by moving the carriage 22 and bringing it in contact with a stopper 95 in the vicinity of the left-side wall of the frame 2, and the original position of the typewheel 24 is set by rotating the typewheel 24 in the state of contact with a stopper (not shown), and thereafter processing proceeds to S13.
  • the print head 27a is moved to the relocation position, and processing proceeds to S14.
  • description on mechanical and electric configurations and controls thereof for setting the original positions of the carriage 22 and the typewheel 24 are similar to the printwheel homing apparatus disclosed in U.S. Pat. No. 4,264,220 or U.K. Pat. Application No. 8800171.
  • S14 based on the print direction flag 153, whether or not the print direction is left is judged, and the judgment results in YES in the case of left direction (the print direction flag 153 is reset), and processing proceeds to S15.
  • the print head 27a is moved to the print position lower (right side) by one character, and processing moves to S16, and regulation of backlash and wire elongation is performed by moving the print head 27a to the print position higher (left side) by one character again, and processing proceeds to S5, and printing is resumed from the relocation position halfway of printing.
  • the print direction is right, regulation of backlash and wire elongation is not required, and therefore judgment is made to be NO, and processing proceeds to S5.
  • the print head 27a is returned to the relocation position after regulation of the positional errors due to backlash and wire elongation, and therefore the character intervals on the place where printing is resumed can be kept constant likewise the case where the printing direction is right, and thereby accurate printing can be made.
  • configuration is made in a manner that the original position of the carriage 22 is set by bringing the carriage 22 in contact with a stopper 95 in the vicinity of the left-side wall of the frame 2, but configuration may be made in a manner that the original position is set by bringing the carriage 22 in contact with a stopper in the vicinity of the right-side wall of the frame 2, and in this case, after suspending the printing by opening the cover 4 when the printing direction is right, regulation of positional errors is performed.
  • configuration is made in a manner that printing is suspended and resumed based on the open/close signal of the cover 4, but configuration may be made in a manner that printing is suspended based on a detection signal from a ribbon end detecting means when the print ribbon 26 runs out, and printing is resumed when the restart key is operated.
  • the "H"-level signal is sent to the above-­mentioned input port of the CPU 130, and when the restart key is operated, the "L"-level signal is sent to that port.
  • the above-mentioned ribbon end detecting means can be constituted with an aluminum reflecting foil affixed to the ribbon end and a light emitter and a photoreceptor which are installed in the carriage 22 so as to correspond to the aluminum reflecting foil.
  • the present invention is applicable also to various printers having a gear mechanism in the carriage driving system such as thermal-head type printers, wire-dot type printers, ink-jet type printers and laser printers besides the daisy-wheel type typewriter of the above-mentioned embodiment.

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EP19880303981 1987-05-02 1988-05-03 Vorrichtung zum Steuern der Wagenbewegung in einem Drucker Expired - Lifetime EP0290219B1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP62109589A JPS63274575A (ja) 1987-05-02 1987-05-02 印字装置
JP109589/87 1987-05-02
JP62121550A JPS63286378A (ja) 1987-05-19 1987-05-19 印字装置
JP121550/87 1987-05-19

Publications (3)

Publication Number Publication Date
EP0290219A2 true EP0290219A2 (de) 1988-11-09
EP0290219A3 EP0290219A3 (en) 1990-07-04
EP0290219B1 EP0290219B1 (de) 1993-09-22

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Application Number Title Priority Date Filing Date
EP19880303981 Expired - Lifetime EP0290219B1 (de) 1987-05-02 1988-05-03 Vorrichtung zum Steuern der Wagenbewegung in einem Drucker

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EP (1) EP0290219B1 (de)
DE (1) DE3884262T2 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU662857B2 (en) * 1993-04-27 1995-09-14 Gerber Scientific Products Inc. Method and apparatus for printing on sheet material

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4180335A (en) * 1975-11-30 1979-12-25 Ricoh Company, Ltd. High speed serial printer
EP0068122A2 (de) * 1981-06-30 1983-01-05 International Business Machines Corporation Druckkopfsteuerung für einen bidirektionalen Seriendrucker mit Vorausschau
EP0140389A2 (de) * 1983-11-03 1985-05-08 Siemens Aktiengesellschaft Verfahren und Anordnung zur Reduzierung des Druckversatzes in bidirektional druckenden Matrixdruckeinrichtungen

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4180335A (en) * 1975-11-30 1979-12-25 Ricoh Company, Ltd. High speed serial printer
EP0068122A2 (de) * 1981-06-30 1983-01-05 International Business Machines Corporation Druckkopfsteuerung für einen bidirektionalen Seriendrucker mit Vorausschau
EP0140389A2 (de) * 1983-11-03 1985-05-08 Siemens Aktiengesellschaft Verfahren und Anordnung zur Reduzierung des Druckversatzes in bidirektional druckenden Matrixdruckeinrichtungen

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU662857B2 (en) * 1993-04-27 1995-09-14 Gerber Scientific Products Inc. Method and apparatus for printing on sheet material

Also Published As

Publication number Publication date
EP0290219B1 (de) 1993-09-22
DE3884262D1 (de) 1993-10-28
EP0290219A3 (en) 1990-07-04
DE3884262T2 (de) 1994-04-28

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JPS62240573A (ja) 印字装置

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