EP0307180A2 - Schreibkopf mit S/P-Umsetzer und Steuerschaltung für Drucker - Google Patents

Schreibkopf mit S/P-Umsetzer und Steuerschaltung für Drucker Download PDF

Info

Publication number
EP0307180A2
EP0307180A2 EP88308265A EP88308265A EP0307180A2 EP 0307180 A2 EP0307180 A2 EP 0307180A2 EP 88308265 A EP88308265 A EP 88308265A EP 88308265 A EP88308265 A EP 88308265A EP 0307180 A2 EP0307180 A2 EP 0307180A2
Authority
EP
European Patent Office
Prior art keywords
driving
print head
printing
serial
circuit
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
EP88308265A
Other languages
English (en)
French (fr)
Other versions
EP0307180A3 (en
EP0307180B1 (de
Inventor
Hiroshi Kikuchi
Jiro Tanuma
Hideaki Ishimizu
Tadashi Kasai
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.)
Oki Electric Industry Co Ltd
Original Assignee
Oki Electric Industry 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 Oki Electric Industry Co Ltd filed Critical Oki Electric Industry Co Ltd
Publication of EP0307180A2 publication Critical patent/EP0307180A2/de
Publication of EP0307180A3 publication Critical patent/EP0307180A3/en
Application granted granted Critical
Publication of EP0307180B1 publication Critical patent/EP0307180B1/de
Expired legal-status Critical Current

Links

Images

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
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/485—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by the process of building-up characters or image elements applicable to two or more kinds of printing or marking processes
    • B41J2/505—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by the process of building-up characters or image elements applicable to two or more kinds of printing or marking processes from an assembly of identical printing elements
    • B41J2/5056—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by the process of building-up characters or image elements applicable to two or more kinds of printing or marking processes from an assembly of identical printing elements using dot arrays providing selective dot disposition modes, e.g. different dot densities for high speed and high-quality printing, array line selections for multi-pass printing, or dot shifts for character inclination

Definitions

  • This invention relates to a printer, particularly to a driving circuit.
  • a conventional driving circuit employs a control unit having a control circuit for controlling a space motor for moving a carriage on which the print head is mounted and a line feed motor for performing a line feed, and a driving circuit for driving a print head.
  • the space motor, the line feed motor and the print head are respectively connected to the control unit through connection cables.
  • Fig. 1 is a schematic view illustrating a conventional driving circuit.
  • a control unit 1 comprises a control circuit 2, a driving circuit 3 and a connector 4.
  • a carriage 5 comprises a connector 6 and a print head 7.
  • the connectors 4 and 6 are connected to each other by a cable 8.
  • Fig. 2 shows a concrete example of the conventional driving circuit illustrated in Fig. 1.
  • 9A and 9B represent timing signals to determine periods for which the driving power is supplied.
  • Transistors 10A and 10B are turned on and off in response to the signals 9A and 9B.
  • Driving signals 1101 to 1124 respectively correspond to 24 printing dot pins, not shown, contained in the print head 7.
  • Transistors 1201 to 1224 are provided to be turned on and off in response to the driving signals 1101-1124 for controlling the electric currents through driving coils 1301 to 1324, which in turn drive the respective dot pins in the print head 7.
  • N+1 signal lines are required for driving the dot pins when the dot pins are aligned along a single vertical line and (N+2) lines are required when the dot pins are aligned in two staggered vertical lines as in a stagger head.
  • a serial-to-parallel converter is mounted on the carriage, and driving information is transmitted serially from the control circuit to the serial-­to-parallel converter, and converted into parallel information.
  • An object of the present invention is to provide a printer in which the number of signal lines are reduced.
  • Another object of the present invention is to provide a printer which permits the cable and the carriage to be commonly used between different types of a print head.
  • the present invention is characterized by incorporating a serial-to-parallel converter and a driving circuit into the print head.
  • serial printing information is transmitted to the serial-to-parallel converter of the print head through the connectors and the cable and converted into parallel printing information.
  • Control signals from the control circuit concerning the driving are transmitted to the driving circuit of the print head, and converted and then selectively applied to the driving elements of the print head so that the driving elements designated by the parallel printing information are driven in accordance with the control signals.
  • Fig. 3 shows a printer having circuit for driving a print head according to an embodiment of the present invention.
  • 14 represents a print head with 24 pins (not shown);
  • 15 represents a control unit for generating printing information to be supplied to the print head 14;
  • 16 represents a cable for connecting the control unit 15 and the print head 16; 17 and 18 are connectors for connection with the cable 16;
  • 19 represents a control circuit composed of a microprocessor and the like and transmits, through signal lines 20, 21 and 22 of the cable 16 to the print head 14, a clock signal C, a data signal D in the form of serial printing information and a trigger signal T instructing printing timing and data transmission.
  • 23 represents a power supply unit, a logic power supply Vl and a ground E of which are connected to the control circuit 19. The logic power supply Vl and the ground E as well as a driving power supply Vd of which is respectively connected to the print head 14 through power lines 23, 24 and 25 of the cable 16.
  • 2601-2624 represent driving coils which serve as printing elements for the printing pins.
  • 27 represents a serial-to-parallel converter (S/P converter) which is composed of a 24-bit shift register 28 and a 24-bit latch circuit 29 and converts serial printing information from the control circuit 19 into parallel printing information.
  • S/P converter serial-to-parallel converter
  • Fig. 4 is a timing chart showing the operation of the converter 27.
  • the shift register 28 of the converter 27 successively receives and shifts a series of data signals (bits) D designating activation (printing) or non-activation (non-­printing) for the respective ones of the 24 printing pins, in synchronism with the clock signal C, following a trigger signal T.
  • the latch circuit 29 latches the series of the data signals D.
  • the contents of the latch circuit 29 are output as on/off driving signals Dr1-Dr24.
  • 30 represents a driving circuit for driving the coils 2601-2624.
  • 31 represents a driving time generation circuit for generating a driving time.
  • Fig. 5 is a circuit diagram illustrating the driving time generation circuit in which the driving time generation circuit 31 comprises a charge-discharge circuit composed of a capacitor C1 and a resistor R1 and a comparator CP comparing a potential on the capacitor C1 with a reference voltage Va set by voltage-dividing resistors R2 and R3.
  • the capacitor C1 After being discharged by the trigger signal T, the capacitor C1 is charged. While the voltage on the capacitor is lower than the reference voltage Va, the comparator CP maintains its output, i.e., a driving signal Dr0 to be high, thereby keeping the transistor Tr0 on, to supply the driving power Vd to one terminal of each of all the coils 2601-2624.
  • the time for which the driving power is applied is determined to be the time necessary for printing.
  • +Vcc and 5V represent respective terminals for the driving power supplies.
  • Transistors Tr1-Tr24 are disposed to couple the other terminal of each of the coils 2601-2624 to the ground E and are turned on when the corresponding signals Dr1 to Dr24 from the S/P converter 27 are high. As a result, the coils 2601-2624 are energized for the above-mentioned period of printing when the corresponding bits of the printing data supplied from the S/P converter 27 are high ("1").
  • Fig. 6 shows how the print head 14 and other parts are assembled.
  • the print head 14 has electric components, generally denoted by reference numeral 33, which include the S/P converter 27 and the driving circuit 30 mounted on a printed circuit board 32.
  • the electric components 33 are covered by a cover 34.
  • the print head 14 is mounted on a carriage 35 in such a way that a male connector 36 of the printed circuit board 32 is inserted in a female connector 18 attached to the carriage 35.
  • the female connector 18 of the carriage 35 is connected by the cable 16 to the control unit 19.
  • Fig. 6 37 represents a guide shaft to which the carriage 35 is mounted such that it is movable along the guide shaft 37 from side to side of the printer, 38 represents a platen on which a printing paper is passed.
  • An ink ribbon is interposed between the print head and the printing paper on the platen 38.
  • the driving time generation circuit 31 When the trigger signal T from the control circuit 19 falls at time t1, the driving time generation circuit 31 the capacitor C1 releases its charge in a moment and then begins to be charged.
  • the driving signal Dr0 output from the comparator CP is at the high level so that the transistor Tr0 is on.
  • the driving signal Dr0 becomes low so that the transistor Tr0 turns off and the coil currents I1 and I24 are interrupted. The printing pins are thereby retracted.
  • control circuit 19 and the S/P converter 27 are connected to each other via three signal lines, a plurality of alarm signals and the like can be added to perform interruption of printing or alteration of printing cycle time.
  • data signal D′ having additional driving time control information D1 and D2 together with the series of signals D1 to D24 can be used in place of the data signal D.
  • a delay time information can be added in which case bit numbers of the shift register 28 and the latch circuit 29 are increased to accommodate the delay time information.
  • the resistor R1 can be made variable so as to permit control of the printing head 14 in accordance with temperature information and the resistor R2 can be made variable so as to permit control in accordance with the driving time information.

Landscapes

  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Accessory Devices And Overall Control Thereof (AREA)
  • Dot-Matrix Printers And Others (AREA)
EP19880308265 1987-09-07 1988-09-07 Schreibkopf mit S/P-Umsetzer und Steuerschaltung für Drucker Expired EP0307180B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP1987136708U JPH0512060Y2 (de) 1987-09-07 1987-09-07
JP136708/87U 1987-09-07

Publications (3)

Publication Number Publication Date
EP0307180A2 true EP0307180A2 (de) 1989-03-15
EP0307180A3 EP0307180A3 (en) 1989-12-13
EP0307180B1 EP0307180B1 (de) 1992-08-19

Family

ID=15181630

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19880308265 Expired EP0307180B1 (de) 1987-09-07 1988-09-07 Schreibkopf mit S/P-Umsetzer und Steuerschaltung für Drucker

Country Status (3)

Country Link
EP (1) EP0307180B1 (de)
JP (1) JPH0512060Y2 (de)
DE (1) DE3873863T2 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0532877A2 (de) * 1991-08-02 1993-03-24 Canon Kabushiki Kaisha Aufzeichnungsgerät, Aufzeichnungskopf und Substrat
US5745136A (en) * 1993-04-16 1998-04-28 Canon Kabushiki Kaishi Liquid jet head, and liquid jet apparatus therefor
CN1131785C (zh) * 1999-02-10 2003-12-24 广州市海天长信科技有限公司 彩色喷墨打印机喷墨头串行通讯电路

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58158268A (ja) * 1982-03-17 1983-09-20 Toshiba Corp プリンタヘツド・ドライブ回路
JPS60236782A (ja) * 1984-05-10 1985-11-25 Nec Corp ドツトマトリツクスプリンタ
JPS60242087A (ja) * 1984-05-17 1985-12-02 Oki Electric Ind Co Ltd プリンタの印字ヘツド駆動回路
JPS61143170A (ja) * 1984-12-17 1986-06-30 Nec Corp 印字装置
GB2197105A (en) * 1986-10-23 1988-05-11 Brother Ind Ltd Serial printer

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55109684A (en) * 1979-02-16 1980-08-23 Ricoh Co Ltd Recorder

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58158268A (ja) * 1982-03-17 1983-09-20 Toshiba Corp プリンタヘツド・ドライブ回路
JPS60236782A (ja) * 1984-05-10 1985-11-25 Nec Corp ドツトマトリツクスプリンタ
JPS60242087A (ja) * 1984-05-17 1985-12-02 Oki Electric Ind Co Ltd プリンタの印字ヘツド駆動回路
JPS61143170A (ja) * 1984-12-17 1986-06-30 Nec Corp 印字装置
GB2197105A (en) * 1986-10-23 1988-05-11 Brother Ind Ltd Serial printer

Non-Patent Citations (5)

* Cited by examiner, † Cited by third party
Title
IBM TECHNICAL DISCLOSURE BULLETIN, vol. 19, no. 8, January 1977, pages 2986-2987, New York, US; T.A. BRESKI et al.: "Multielement print head" *
PATENT ABSTRACTS OF JAPAN, vol. 10, no. 100 (M-470)[2157], 16th April 1986; & JP-A-60 236 782 (NIPPON DENKI K.K.) 25-11-1985 *
PATENT ABSTRACTS OF JAPAN, vol. 10, no. 114 (M-473)[2171], 26th April 1986; & JP-A-60 242 087 (OKI DENKI KOGYO K.K.) 02-12-1985 *
PATENT ABSTRACTS OF JAPAN, vol. 10, no. 342 (M-536)[2398], 19th November 1986; & JP-A-61 143 170 (NEC CORP.) 30-06-1986 *
PATENT ABSTRACTS OF JAPAN, vol. 7, no. 283 (M-263)[1428], 16th December 1983; & JP-A-58 158 268 (TOKYO SHIBAURA DENKI K.K.) 20-09-1983 *

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0532877A2 (de) * 1991-08-02 1993-03-24 Canon Kabushiki Kaisha Aufzeichnungsgerät, Aufzeichnungskopf und Substrat
EP0532877A3 (en) * 1991-08-02 1993-06-16 Canon Kabushiki Kaisha Recording apparatus, recording head and substrate therefor
EP1122071A3 (de) * 1991-08-02 2001-08-22 Canon Kabushiki Kaisha Aufzeichnungsgerät, Aufzeichnungskopf und Substrat
US6290334B1 (en) 1991-08-02 2001-09-18 Canon Kabushiki Kaisha Recording apparatus, recording head and substrate therefor
US6474789B1 (en) 1991-08-02 2002-11-05 Canon Kabushiki Kaisha Recording apparatus, recording head and substrate therefor
EP1529643A3 (de) * 1991-08-02 2005-07-13 Canon Kabushiki Kaisha Aufzeichnungsgerät, Aufzeichnungskopf und Substrat dafür
US5745136A (en) * 1993-04-16 1998-04-28 Canon Kabushiki Kaishi Liquid jet head, and liquid jet apparatus therefor
CN1131785C (zh) * 1999-02-10 2003-12-24 广州市海天长信科技有限公司 彩色喷墨打印机喷墨头串行通讯电路

Also Published As

Publication number Publication date
EP0307180A3 (en) 1989-12-13
JPH0512060Y2 (de) 1993-03-26
DE3873863D1 (de) 1992-09-24
DE3873863T2 (de) 1993-04-08
JPS6440661U (de) 1989-03-10
EP0307180B1 (de) 1992-08-19

Similar Documents

Publication Publication Date Title
US4930915A (en) Printer having means for identifying print head type
EP0774358B1 (de) Thermodrucker
EP0131966B1 (de) Schrittformatüberlagerungs-Druckvorrichtung
US4085837A (en) Vertical tabulation control for high speed printer
US4219824A (en) Thermal recording apparatus
US5457488A (en) Method and apparatus for controlling array of light-emitting elements
EP0295953A2 (de) Druckverfahren für thermische Drucker
EP0254454B1 (de) Nach dem Übertragungsprinzip arbeitender Thermo-Drucker
JP2002225246A (ja) 印刷装置、印刷ヘッドの駆動制御装置及び方法、並びに温度検出装置
GB2119549A (en) Multicolor printer
US5354135A (en) Recorder and dot pattern control circuit
EP0307180B1 (de) Schreibkopf mit S/P-Umsetzer und Steuerschaltung für Drucker
EP0751003B1 (de) Drucker mit abnehmbarem Druckkopf
US5724077A (en) Driving method for an ink jet recording device having a plurality of recording heads
US4983054A (en) Data latching for preheat and print control in a thermal printer
JPH081996A (ja) ラインヘッド
JPH0311273B2 (de)
US5149214A (en) Print wire driving apparatus
KR100398032B1 (ko) 소형프린터
JPH0538836A (ja) プリントヘツド及び印字装置
JPS61262162A (ja) ワイヤドットヘッド
JPS60242087A (ja) プリンタの印字ヘツド駆動回路
JPS609775A (ja) サ−マルヘツド駆動方式
JPH024550A (ja) プリンタ装置
JP2796763B2 (ja) 印字ヘッド制御方式

Legal Events

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

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): DE FR GB

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): DE FR GB

17P Request for examination filed

Effective date: 19900406

17Q First examination report despatched

Effective date: 19911204

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE FR GB

ET Fr: translation filed
REF Corresponds to:

Ref document number: 3873863

Country of ref document: DE

Date of ref document: 19920924

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20070830

Year of fee payment: 20

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20070905

Year of fee payment: 20

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20070914

Year of fee payment: 20

REG Reference to a national code

Ref country code: GB

Ref legal event code: PE20

Expiry date: 20080906

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF EXPIRATION OF PROTECTION

Effective date: 20080906