EP0156391A1 - Machine à écrire à disque porte-caractère - Google Patents

Machine à écrire à disque porte-caractère Download PDF

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Publication number
EP0156391A1
EP0156391A1 EP85103802A EP85103802A EP0156391A1 EP 0156391 A1 EP0156391 A1 EP 0156391A1 EP 85103802 A EP85103802 A EP 85103802A EP 85103802 A EP85103802 A EP 85103802A EP 0156391 A1 EP0156391 A1 EP 0156391A1
Authority
EP
European Patent Office
Prior art keywords
daisy wheel
spokes
printing
spoke
home position
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.)
Withdrawn
Application number
EP85103802A
Other languages
German (de)
English (en)
Inventor
Motoi Maekawa
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.)
Toshiba TEC Corp
Original Assignee
Tokyo Electric Co 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
Application filed by Tokyo Electric Co Ltd filed Critical Tokyo Electric Co Ltd
Publication of EP0156391A1 publication Critical patent/EP0156391A1/fr
Withdrawn legal-status Critical Current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
    • B41J7/00—Type-selecting or type-actuating mechanisms
    • 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
    • B41J1/00—Typewriters or selective printing mechanisms characterised by the mounting, arrangement or disposition of the types or dies
    • B41J1/22—Typewriters or selective printing mechanisms characterised by the mounting, arrangement or disposition of the types or dies with types or dies mounted on carriers rotatable for selection
    • B41J1/24—Typewriters or selective printing mechanisms characterised by the mounting, arrangement or disposition of the types or dies with types or dies mounted on carriers rotatable for selection the plane of the type or die face being perpendicular to the axis of rotation

Definitions

  • This invention relates to a daisy wheel typewriter.
  • An electronic typewriter for use with a daisy wheel which has a plurality of, for instance 100, spokes arranged in a radial arrangement and having printing types of characters such as alphabet letters, numerals and symbols provided at the end, is well known in the art.
  • spokes with printing types of characters which are used comparatively frequently such as small letters and numerals
  • spokes with printing types of characters which are less frequently used such as capital letters and special characters are arranged close to a spoke remote from the reference spoke, e.g., spaced apart 180° from the reference spoke.
  • the reference spoke of the daisy wheel is returned to the home position when no key is operated until the lapse of a predetermined period of time. This is done so that the last printed character may be readily confirmed, the reference spoke having a smaller length than the length of the other spokes to this end, and also that frequently used characters may be printed speedily.
  • the capital letters are thought to be used less frequently, sometimes sentences are typewritten, which are constituted by capital letters.
  • the prior art daisy wheel is immediately returned to the home position when no key is operated until the lapse of a predetermined period of time.
  • An object of the invention is to provide a daisy wheel typewriter, with which the daisy wheel printing type characters can be printed speedily irrespective of whether the characters are used frequently or not.
  • a daisy wheel typewriter which comprises a daisy wheel including a center member and a plurality of spokes mounted in a radial arrangement on the center member, the spokes having characters provided at the end and being grouped into first and second spoke groups respectively including first and second reference spokes, a keyboard circuit including a plurality of character keys for generating printing data when selectively operated to select a corresponding printing type and at least one function key, a position sensor for generating an output signal when detecting that the first reference spoke is at a home position, a daisy wheel driver for causing rotation of the daisy wheel according to a drive signal, a hammer driver, data generator for generating group designation data representing the first or second designation data representing which of the first and second spoke groups is designated, and a control unit for providing a drive signal to the daisy wheel drive means according to input printing data to cause rotation of the daisy wheel to set a printing type, designated by the input printing data, to a printing position and
  • group designation data representing either the first or second spoke group, to which a spoke with a character to be printed belongs, is generated from a data generator. Unless no subsequent character key is operated within a predetermined period of time, the first or second reference spoke in the first or second spoke group designated by the group designation data is set to the home position.
  • respective characters can be printed quickly, for each printing type is usually set to the printing position with only a short rotation of the daisy wheel.
  • Fig. 1 shows the structure of a daisy wheel DW used in an embodiment of an electronic typewriter according to the invention.
  • the daisy wheel DW has a center member or disk 1 and a plurality of, e.g., 100, spokes 2 mounted in a radial arrangement on the disk 1 and each having a printing type 3 of an individual character provided at the end.
  • the spokes 2 include a reference spoke 2A.
  • the reference spoke 2A and a spoke 2B adjacent to and on the left side of the reference spoke 2A are made shorter than the neighboring spokes 2.
  • the disk 1 has a home position hole 4 formed at a position corresponding to the reference spoke 2A.
  • a spoke 2C which is angularly spaced apart substantially 180° from the reference spoke 2A and a spoke 2D adjacent to and on the left side of the spoke 2C are also made shorter than the neighboring spokes 2.
  • Spokes 2 neighboring and centered on the reference spoke 2A (which constitute substantially an upper half of the illustrated daisy wheel) constitute a first spoke group, which have printing types 3 of comparatively frequently used characters such as small letters and numerals.
  • Spokes 2 neighboring and centered on the spoke 2C constitute a second spoke group with printing types 3 of less frequently used characters such as capital letters and special characters.
  • the daisy wheel OW is rotated by a daisy wheel motor as drive means to be described later.
  • a first home position sensor to be described later detects the hone position hole 4, whereby the daisy wheel is set to a first home position.
  • a second home position sensor to be described later detects the home position hole 4, whereby the daisy wheel is set at a second home position.
  • Fig. 2 shows an essential part of the circuitry of the embodiment of the electronic typewriter according to the invention.
  • the circuitry illustrated includes a microprocessor 11 and a keyboard circuit 12.
  • the microprocessor 11 has a shift flag area SF which serves as spoke group determination means, a timer TM, a first memory Ml where position data "0" for the reference spoke 2A is preset, and a second memory M2 where position data "50" for the spoke 2C is preset.
  • the keyboard circuit 12 although shown only schematically for the sake of simplicity of illustration, has character keys including alphabet keys 12A corresponding to alphabet letters "a" to- "z-" and “A” to “Z” and numeral keys 12 B corresponding to numerals "0" to “9", a shift key 12C which is operated when a capital letter is to be printed, a shift lock key 12D which is operated when printing a capital letter subsequent to a small letter or printing a small letter subsequent to a capital letter, and other function keys.
  • the microprocessor 11 sequentially generates from its output port key scanning signals SO to S9 which are fed to the keyboard circuit 12 via inverters. It also receives at its input port return signals RO to R7 which are each fed back from the keyboard circuit 12 when each of the key scanning signals is generated. In this way, the microprocessor 11 detects an operated key in the keyboard circuit 12. Usually, a voltage +V1 from a voltage source VS is supplied to the input port at all times. The microprocessor 11 also receives at a different input port the output signals from the first and second home position sensors 13 and 14 noted above, thereby checking whether the home position hole 4 of the daisy wheel is at a position to be detected by the sensor 13 or 14.
  • the microprocessor 11 further generates, from a different output port, control signals for controlling the operation of a motor driver 16, which drives a daisy wheel motor 16-1 for rotating the daisy wheel and a carriage motor 16-2 for moving a carriage (not shown) carrying the daisy wheel mounted thereon, and also the operation of a hammer driver 17, which drives a hammer to strike a printing type 3 set at the printing position.
  • a motor driver 16 which drives a daisy wheel motor 16-1 for rotating the daisy wheel and a carriage motor 16-2 for moving a carriage (not shown) carrying the daisy wheel mounted thereon
  • a hammer driver 17 which drives a hammer to strike a printing type 3 set at the printing position.
  • Fig. 3 shows the circuit construction of the first home position sensor 13.
  • the illustrated sensor 13 includes a light-emitting diode 13-1 connected between a voltage source terminal at +Vl and ground, a phototransistor 13-2 which is rendered conductive in response to light from the light-emitting diode 13-1, a diode 13-3 connected in opposite polarity between the collector and emitter of the phototransistor 13-2, a resistor 13-4 connected between the emitter of the phototransistor 13-2 and ground and an inverting amplifier 13-5 for amplifying and inverting the emitter voltage on the phototransistor 13-2 and feeding the amplified and inverted output to the microprocessor 11.
  • the phototransistor 13-2 When the light from the light-emitting diode 13-1 is blocked by the disk 1, the phototransistor 13-2 is nonconductive, and a signal at a high level is fed from the amplifier 13-5 to the microprocessor 11. When the light from the light-emitting diode 13-1 is incident on the phototransistor 13-2 through the hole 4 in the disk 1, the phototransistor 13-2 is rendered conductive, so that a low level signal is provided from the amplifier 13-5.
  • the microprocessor 11 thus can judge whether the daisy wheel is at the first home position according to the output of the sensor 13.
  • the second home position sensor 14 has the same construction as the first home position sensor 13, and the microprocessor 11 can judge whether the daisy wheel is at the second home position according to the output signal of the sensor 14.
  • Fig. 4 shows an example of the hammer driver 17.
  • the illustrated hammer driver 17 includes an npn transistor 17-1, which has its emitter grounded through a resistor and whose conduction state is controlled according to a drive control signal fed from the microprocessor 11, and a solenoid coil 17-2, which has one end connected to the collector of the transistor 17-1 and the other end connected to a voltage terminal at +V2 through a resistor.
  • the microprocessor 11 When the microprocessor 11 generates a drive control signal at a high level, the solenoid coil 17-2 is energized, so that a hammer or actuator is driven to strike the character at the printing position.
  • the microprocessor 11 first checks whether one of the keys is operated. When it detects that one of the keys is operated, it checks whether the operated key is a character key such as an alphabet letter key 12A or a numeral key 12B or shift lock key 12D or other key. If it detects that the operated key is a character key, the microprocessor 11 determines the extent, to which the daisy wheel is to be rotated, through comparison of the prevailing position of the daisy wheel to the position data of the printing type 3 designated by the operated character key.
  • a character key such as an alphabet letter key 12A or a numeral key 12B or shift lock key 12D or other key. If it detects that the operated key is a character key, the microprocessor 11 determines the extent, to which the daisy wheel is to be rotated, through comparison of the prevailing position of the daisy wheel to the position data of the printing type 3 designated by the operated character key.
  • the microprocessor 11 drives the daisy wheel motor 16-1 to set the designated printing type 3 to the printing position. Then it supplies an energization signal to the printing hammer driver 17 to drive the hammer. Then it supplies a control signal to the motor driver 16 to drive the carriage motor 16-2 so as to move the daisy wheel in a printing direction to the next printing position. Then it sets the timer TM.
  • the microcomputer 11 If the microcomputer 11 detects that the operated key is the shift lock key 12D, it checks whether the shift flag SF is set in STEP 1. If the shift flag SF is set, the microcomputer 11 resets this flag. If the flag is reset, on the other hand, the microcomputer 11 sets the flag. After the microprocessor 11 resets the shift flag SF, it checks whether the signal from the first home position sensor 13 is at a low level indicating that the hole 4 is being detected. If the signal of the sensor 13 is at a high level, the microprocessor 11 determines the extent of rotation of the daisy wheel through comparison of the prevailing daisy wheel position to the reference position data "0" of the reference spoke 2A read out from the first memory Ml.
  • the daisy wheel motor 16-1 drives the daisy wheel motor 16-1 to set the printing type 3 of the reference spoke 2A to the printing position.
  • the first home position sensor 13 detects the home position hole 4 to generate the low level signal. The operation of the positioning is omitted if it is detected that the signal of the sensor 13 is at the low level.
  • the microcomputer 11 After the microcomputer 11 sets the shift flag SF, it checks whether the signal from the second home position sensor 12 is at a low level. If it detects that the signal of the sensor 14 is at a high level, it determines the extent of rotation of the daisy wheel by comparison of the prevailing daisy wheel position with the reference position data "50" of the spoke 2C read out from the second memory M2. According to the determined extent of rotation, it drives the daisy wheel motor 16-1 to set the printing type 3 of the spoke 2C to the printing position. When this positioning is effected, the second home position sensor 14 detects the home position hole 4 to generate a low level signal. The operation of positioning is omitted if it is detected that the signal of the sensor 14 is at the low level.
  • the microprocessor 11 checks whether the preset time of the timer TM is over. If it detects that the preset time is over, it checks whether the signals from the first and second home position sensors 13 and 14 are at the low level. If it detects that the signal of one of the sensors 13 and 14 is at the low level, the routine ends. If it detects that none of the signals of the sensors 13 and 14 are at the low level, it checks whether the shift flag SF is set. If it detects that the shift flag SF is reset, it determines the extent of rotation of the daisy wheel by comparison of the prevailing daisy wheel position with the position data "0" of the reference spoke 2A read out from the first memory Ml.
  • the daisy wheel motor 16-1 drives the daisy wheel motor 16-1 according to the determined extent of rotation to set the printing type 3 of the reference spoke 2A to the printing position.
  • the first home position sensor 13 detects the home position hole 4 to generate a low level signal.
  • the microprocessor 11 detects that the shift flag SF is set in STEP 2, it determines the extent of rotation of the daisy wheel by comparison of the prevailing daisy wheel position to the position data "50" of the spoke 2C read out from the second memory Ml. According to the determined extent of rotation, it drives the daisy wheel motor 15 to set the printing type 3 of the spoke 2C to the printing position. When this positioning is effected, the second home position sensor 14 detects the home position hole 4 to generate a low level signal.
  • the extent to which the daisy wheel is to be rotated is determined by comparison of the prevailing daisy wheel position with the position data of the printing type corresponding to the operated character key to drive the daisy wheel motor 16-2 according to the determined extent of rotation, setting a corresponding printing type to the printing position.
  • the timer T is set.
  • either reference spoke 2A or 2C is set to the printing position depending on whether the shift flag SF is set or reset. If it is found that the shift flag SF is reset, the reference spoke 2A is set to the printing position.
  • the spoke 2C is set to the printing position.
  • either reference spoke 2A or 2C of the daisy wheel is set to the printing position to be ready for the subsequent printing operation. Therefore, if a subsequently operated character key corresponds to a character in the same group as the character of the preceding operated character key, the character of that character key is within the semicircle arc centered on the reference spoke 2A or 2C in the printing position.
  • the extent of rotation of the daisy wheel necessary for the subsequently operated character key can be reduced so that the subsequent character can be printed more quickly.
  • the state of the shift flag SF is inverted, and the reference spoke 2A or 2C is immediately set to the printing position according to the inverted state of the shift flag SF.
  • the daisy wheel is concurrently selectively set to the first or second home position that corresponds to a smaller extent of daisy wheel rotation necessary for the printing of the subsequent character.
  • the subsequent character can be speedily printed in response to the key operation.
  • the embodiment is by no means limitative.
  • the daisy wheel is set to the second home position through the calculation of the extent of rotation of the daisy wheel necessary to get from the prevailing position to the second home position thereof.
  • the spokes 2A to 2D have had a smaller length than the length of the other spokes, they may have the same length as the other spokes.
  • no printing type may be provided on the end of the spokes 2A to 2D.
  • the reference spoke 2C may not be provided at an angle of 180° relative to the reference spoke 2A but may be at any other suitable angle relative thereto.

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  • Accessory Devices And Overall Control Thereof (AREA)
EP85103802A 1984-03-30 1985-03-29 Machine à écrire à disque porte-caractère Withdrawn EP0156391A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP62529/84 1984-03-30
JP59062529A JPS60206648A (ja) 1984-03-30 1984-03-30 デイジ−ホイ−ル式タイプライタ

Publications (1)

Publication Number Publication Date
EP0156391A1 true EP0156391A1 (fr) 1985-10-02

Family

ID=13202807

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85103802A Withdrawn EP0156391A1 (fr) 1984-03-30 1985-03-29 Machine à écrire à disque porte-caractère

Country Status (3)

Country Link
EP (1) EP0156391A1 (fr)
JP (1) JPS60206648A (fr)
KR (1) KR850006521A (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3924725A (en) * 1974-06-28 1975-12-09 Ibm Dual array disc printer
US4044880A (en) * 1973-12-26 1977-08-30 International Business Machines Corporation High speed wheel printer and method of operation

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4044880A (en) * 1973-12-26 1977-08-30 International Business Machines Corporation High speed wheel printer and method of operation
US3924725A (en) * 1974-06-28 1975-12-09 Ibm Dual array disc printer

Also Published As

Publication number Publication date
KR850006521A (ko) 1985-10-14
JPS60206648A (ja) 1985-10-18

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Effective date: 19860205

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18D Application deemed to be withdrawn

Effective date: 19870930

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Inventor name: MAEKAWA, MOTOI