EP0057118B1 - Elektromechanisches Druckwerk für einen Serienparalleldrucker - Google Patents

Elektromechanisches Druckwerk für einen Serienparalleldrucker Download PDF

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Publication number
EP0057118B1
EP0057118B1 EP82400032A EP82400032A EP0057118B1 EP 0057118 B1 EP0057118 B1 EP 0057118B1 EP 82400032 A EP82400032 A EP 82400032A EP 82400032 A EP82400032 A EP 82400032A EP 0057118 B1 EP0057118 B1 EP 0057118B1
Authority
EP
European Patent Office
Prior art keywords
motor
sheet
print head
rotary movement
movement
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.)
Expired
Application number
EP82400032A
Other languages
English (en)
French (fr)
Other versions
EP0057118A3 (en
EP0057118A2 (de
Inventor
Renaud Cuel
Henri Le Gledic
Yvon Le Meur
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.)
Thales SA
Original Assignee
Thomson CSF SA
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 Thomson CSF SA filed Critical Thomson CSF SA
Publication of EP0057118A2 publication Critical patent/EP0057118A2/de
Publication of EP0057118A3 publication Critical patent/EP0057118A3/fr
Application granted granted Critical
Publication of EP0057118B1 publication Critical patent/EP0057118B1/de
Expired 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
    • B41J25/00—Actions or mechanisms not otherwise provided for
    • B41J25/001—Mechanisms for bodily moving print heads or carriages parallel to the paper surface
    • B41J25/006—Mechanisms for bodily moving print heads or carriages parallel to the paper surface for oscillating, e.g. page-width print heads provided with counter-balancing means or shock absorbers
    • 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
    • B41J19/76—Line-spacing mechanisms
    • B41J19/78—Positive-feed mechanisms
    • B41J19/94—Positive-feed mechanisms automatically operated in response to carriage return

Definitions

  • the present invention relates to electromechanical printing devices for printers of the series-parallel type.
  • Serial-parallel type printers are well known. Their print head is driven by an alternating rectilinear movement parallel to the inscription lines and comprises n elements (n positive integer) each capable of printing a series of k consecutive dots on a line (k positive integer).
  • n elements n positive integer
  • k positive integer k positive integer
  • current printers use a rotary motor coupled to an eccentric (or to a cam) placed in a light formed in the print head.
  • these printers include an auxiliary rotary motor coupled to a device for moving the printing sheet, and a motor control circuit. This circuit controls the motors in order to animate the print head in an alternating linear movement parallel to the writing lines and to advance the printing sheet as soon as the writing of a line is finished.
  • the disadvantage of the two motors and their control circuit is that they are expensive.
  • a printing device comprising a single motor, a roller supporting a sheet, a fixed printing head, first transmission elements transforming the rotary movement generated by the motor into a rotation movement of the roller around its axis, for advancing the sheet, and second transmission elements transforming the rotary movement generated by the motor into a reciprocating and rectilinear movement moving the roller parallel to its axis and in synchronism with its rotational movement.
  • first transmission elements transforming the rotary movement generated by the motor into a rotation movement of the roller around its axis, for advancing the sheet
  • second transmission elements transforming the rotary movement generated by the motor into a reciprocating and rectilinear movement moving the roller parallel to its axis and in synchronism with its rotational movement.
  • patent application GB-A-2 046 177 describes a device comprising a movable print head; two rollers supporting the sheet of paper; first transmission elements for driving the paper, comprising: a cylinder pressing on the paper and provided with oblique grooves relative to its generatrices, grooves in which slides a finger secured to the print head, to cause a rotation of the cylinder when the print head is moved; and second transmission elements, for moving the head perpendicular to the direction of movement of the paper and in synchronism with this movement, comprising: a shaft provided with an endless groove, constituting a cam, causing a finger integral with the head, in an alternating linear displacement when the shaft turns in a constant direction.
  • the subject of the present invention is an electromechanical printing device having the advantage of: having only one rotary motor for controlling both the advance of the paper and the movement of the print head, which entails a cost. lower achievement; to include, for moving the roller, only a rotation mechanism, which is simple and which allows the roller to be easily moved to handle the sheet of paper; and to include, to move the head in two fixed positions, a simple and inexpensive device.
  • an electromechanical printing device for a printer of the series-parallel type, comprising: a printing head intended for printing a sheet; a rotary motor; a roller supporting the sheet; first transmission elements transforming the rotary movement generated by the motor into a rotational movement of the roller around its axis, to advance the sheet; second transmission elements transforming the rotary movement generated by the motor into a reciprocating and rectilinear movement applied to the print head, perpendicular and synchronous with the movement of advancement of the sheet to place the head in two fixed positions; is characterized in that the motor is a stepping motor; in that the second transmission elements comprise an eccentric mounted on the axis of the motor and placed in a lumen formed in the print head; in that the first transmission elements comprise a gear coupled to the motor and transmitting only one rotation pitch out of two from the motor, and means for transforming the rotational movement transmitted by the gear into a rotational movement applied to the roller .
  • FIG. 1 represents an embodiment of the device according to the invention for a thermal printer of the series-parallel type, the print head of which is the width of a line and is provided with n electrodes (not shown); each electrode capable of printing two points by moving the print head a distance equal to half the interval separating two consecutive electrodes.
  • This device comprises a rotary step-by-step motor 4, a thermal printing head 1 intended for printing a sheet of electrosensitive paper 2, a roller 3 on which the sheet of paper 2 is placed, and transmission elements transforming the rotary movement printed by the motor4, on the one hand in a rectilinear reciprocating movement animating the printing head 1, and on the other hand in a rotary movement animating the roller 3.
  • the direction of the rectilinear reciprocating movement printed at the printing head impression 1 is there. This direction is parallel to the inscription lines of the sheet 2 and to the axis of rotation of the roll 3.
  • a rotation of the roll 3 causes the sheet of paper to move in a direction perpendicular to the lines of registration.
  • the principle implemented by the transmission elements of the device consists in synchronizing the movements of the print head 1 and of the roller 3 in order to allow a paper advance at the end of the writing of a line and before the start. the registration of a new line.
  • the displacement of the print head 1 is generated by an eccentric 5 placed inside a light formed in the print head 1.
  • this eccentric 5 is coupled to the motor 4 by means of a transmission axis 6 which corresponds to the axis of rotation of the eccentric 5 and to the motor shaft 4.
  • the eccentric 5 transforms the stepwise rotation movement generated by the motor 4 into a reciprocating rectilinear movement, of direction y'y, animating the print head 1.
  • the displacement of the print head 1 is carried out from a first extreme position (position 1) to a second extreme position (position 2).
  • the pitch of the motor 4 is 90 ° and the number of stops of this motor during a cycle of the translational movement of the print head 1 is four. Each engine stop corresponds to an extreme position of the print head 1.
  • FIGS. 2a, 2b, 2c and 2d allow a better understanding of the movement animating the print head 1.
  • the print head 1 the transmission axis 6, the eccentric 5, and the rectangular section 30 of the light formed in the printing head 1, seen from the section plane AA of FIG. 1.
  • an orthogonal coordinate system OX 1 Y 1 has also been shown, the origin of which 0 corresponds to the center of the section of the transmission axis 6.
  • This coordinate system is only used to show the rotary movement of the 'eccentric 5.
  • the instants t i , tz, t 3 and t 4 correspond to the four instants at which the engine 4 stops during a cycle of the translational movement of the print head 1.
  • FIG. 2a corresponds to the position of the print head 1 at time t 1 .
  • This position is the first extreme position of the print head 1, it is position 1.
  • the transmission axis 6 rotates 90 ° and causes a linear displacement of the print head. impression 1. This displacement has the amplitude d.
  • the eccentric 5 and the print head 1 are in the position shown in Figure 2b.
  • This position corresponds to the second extreme position of the print head 1, this is position 2.
  • the transmission axis 6 again rotates 90 °, but this rotation does not cause no translation of the print head 1.
  • the print head 1 is therefore always in position 2 as shown in FIG. 2c.
  • the electrodes of the print head 1 are controlled to print the sheet at the characteristic instants t l , t 2 , t 3 and t 4 of each cycle of the movement of the print head 1. In fact, these instants correspond to on the one hand at the instants of stopping the printhead 1 and on the other hand at extreme positions of the printhead 1. For each writing line, it is necessary that each electrode can print two different dots.
  • the method consists in giving a first print order to the n electrodes at time t 1 , in moving the print head 1 between the instants t i and t 2 , in giving a second print order to the n electrodes at at time t 2 , to command an advance of the printing sheet between times t 2 and t 3 so as to present to the n electrodes a blank writing line, and so on.
  • transmission elements have been placed between the motor 4 and the roller 3 which transforms the rotary movement of the motor 4 into a rotary movement which only drives the roller 3 'between, on the one hand the instants t 2 and t 3 , and on the other hand the instants t 3 and t 4 of the rotation cycle of the motor 4.
  • the advance of the sheet will be controlled between the end of the registration of each line and the start of registration of the next line.
  • FIG. 1 The transmission elements which make it possible to implement this method are represented in FIG. 1.
  • the motor 4 is coupled to the roller 3 by means of a transmission consisting of: a first synchronous pulley 7, the axis of rotation of which corresponds to the axis 6, and a second synchronous pulley 9 linked to the synchronous pulley 7 by means of the toothed belt 8, of a worm 11 whose axis of rotation 10 of direction x'x corresponds to the axis of rotation of the pulley 9, of a toothed wheel 12 meshed with the worm 11, of a toothed wheel 13 whose axis of rotation 20 corresponds to l axis of rotation of the toothed wheel 12, and a toothed wheel 14 meshed with the toothed wheel 13 and having an axis of rotation 15 corresponding to the axis of rotation of the roller 3.
  • the transmission consisting of pulleys 7 and 9, the transmission axis 6, the axis of rotation 10, and the toothed belt 8, serves to drive the worm 11 in a rotational movement around the axis 10.
  • the multiplication ratio of this gear is 1, so that a 90 ° rotation of the motor shaft 4 corresponds to a 90 ° rotation of the screw 11.
  • the gear consisting of the toothed wheels 13 and 14 and transmission axes 15 and 20 it serves to drive the roller 3 in a rotational movement around the axis 15.
  • Each gear step of the tooth wheel 12 corresponds to a rotation of the roller 3 which drives an advance of sheet 2 over a length equal to the interval between two consecutive inscription lines.
  • the gear relating to the toothed wheel 12 and the worm 11 is the most complex. To better understand its operation, this gear has been represented in FIG. 3, seen from the section plane BB of FIG. 1.
  • the face of the tooth wheel 12 which is seen from this cutting plane BB comprises all of the teeth d i (i varying from 1 to 32). These teeth i have a cylindrical shape. They are distributed on a concentric circle at the circumference of the wheel and mesh successively in the thread of the endless screw 11.
  • the shape of the thread is alternately helical and circular.
  • the rhythm of the change in shape of the thread corresponds to a quadrant of the screw 11. In fact, as shown in FIG. 3, the thread of the screw 11 is circular on a quadrant of the screw, helical on the next quadrant, then circular And so on.
  • the screw comprises an active part, consisting of two quadrants comprising the thread of helical shape, and an inactive part consisting of two quadrants comprising the thread of circular shape.
  • the successive steps of rotation of the screw 11 correspond alternately a quadrant comprising the thread of circular shape and a quadrant comprising the thread of helical shape.
  • the screw 11 is previously positioned so that the active part of the screw corresponds to a pitch of rotation of the motor 4 taking place, either between the instants t 2 and t 3 , or between the instants t 4 and t i of each cycle of rotation, and that the inactive part corresponds to the rotation step taking place either between the instants t, and t 2 , or between the instants t s and t 4 .
  • the screw 11 generates a rotation of the toothed wheel 12 and therefore an advance of the sheet 2, only between the instants t 2 and t 3 and that between the instants t 4 and t i of each cycle of motor rotation 4.
  • the roll 3 can easily be moved away from the print head 1.
  • the toothed wheels 13 and 14 provide a convenient means for transmitting a rotational movement roller 3 while allowing it to move away from the print head 1.

Landscapes

  • Character Spaces And Line Spaces In Printers (AREA)
  • Common Mechanisms (AREA)
  • Impact Printers (AREA)

Claims (2)

1. Elektromechanische Druckvorrichtung für einen Drucker vom Serien-Parallel-Typ, enthaltend: einen Druckkopf (1) zum Bedrucken eines Bogens (2); einen Drehantrieb (4); eine den Bogen (2) tragende Rolle (3); erste Übertragungselemente, welche die durch den Drehantrieb (4) erzeugte Drehbewegung in eine Drehbewegung der Rolle (3) um ihre Achse umsetzen, um den Bogen (2) vorzuschieben; zweite Übertragungselemente (5 und 6), welche die durch den Antrieb (4) erzeugte Drehbewegung in eine geradlinige Hin- und Herbewegung umsetzen, die dem Druckkopf (4) erteilt wird, und zwar senkrecht zu und synchron mit der Vorschubbewegung des Bogens (2), zur Bewegung des Kopfes (1) in zwei feste Stellungen; dadurch gekennzeichnet, daß der Antrieb (4) ein Schrittmotor ist; daß die zweiten Übertragungselemente ein Exzenter (5) umfassen, das auf der Achse des Motors (4) montiert und in einer Aussparung des Druckkopfes (1) untergebracht ist; daß die ersten Übertragungsmittel ein an den Antrieb (4) angekoppeltes Getriebe (11, 12) umfassen, welches nur einen von zwei Drehschritten des Motors (4) überträgt, sowie Mittel (12 bis 15) zur Umsetzung der durch das Getriebe übertragenen Drehbewegung in eine der Rolle (3) aufgeprägte Drehbewegung umfassen.
2. Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, daß das Getriebe umfaßt: eine endlose Schnecke (11); ein Zahnrad (12), das mit der endlosen Schnecke (11) in Eingriff ist und eine Drehbewegung ausführt, welche der durch das Getriebe übertragenen Drehbewegung entspricht, und eine Übertragungsvorrichtung (6, 7, 8, und 10), welche die Drehbewegung des Motors (4) auf die endlose Schnecke (11) überträgt; und daß die endlose Schnecke (11) ein Gewinde umfaßt, welches aus Sektoren zusammengesetzt ist, deren Form abwechselnd kreisrund und schraubenförmig ist; und daß jeder Sektor des Gewindes einem Drehschritt des Motors (4) entspricht.
EP82400032A 1981-01-27 1982-01-08 Elektromechanisches Druckwerk für einen Serienparalleldrucker Expired EP0057118B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8101464A FR2498524B1 (fr) 1981-01-27 1981-01-27 Dispositif electromecanique d'impression pour imprimante du type serie-parallele et telecopieur comportant un tel dispositif
FR8101464 1981-01-27

Publications (3)

Publication Number Publication Date
EP0057118A2 EP0057118A2 (de) 1982-08-04
EP0057118A3 EP0057118A3 (en) 1982-08-18
EP0057118B1 true EP0057118B1 (de) 1985-01-23

Family

ID=9254546

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82400032A Expired EP0057118B1 (de) 1981-01-27 1982-01-08 Elektromechanisches Druckwerk für einen Serienparalleldrucker

Country Status (5)

Country Link
US (1) US4420763A (de)
EP (1) EP0057118B1 (de)
JP (1) JPS57144781A (de)
DE (1) DE3261980D1 (de)
FR (1) FR2498524B1 (de)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4520371A (en) * 1982-12-30 1985-05-28 International Business Machines Corporation Multi-zone thermal print head
JPS59187459U (ja) * 1983-05-31 1984-12-12 アルプス電気株式会社 サ−マルプリンタ
JPS6015170A (ja) * 1983-07-08 1985-01-25 Hitachi Koki Co Ltd ドットラインプリンタのシャトル機構
IT1162944B (it) * 1983-09-29 1987-04-01 Olivetti & Co Spa Meccanismo di interlinea per macchina per scrivere
JPS60161160A (ja) * 1984-01-31 1985-08-22 Nec Home Electronics Ltd ドツトラインプリンタ
IT1228366B (it) * 1989-03-13 1991-06-14 Leptons Italia Srl Stampante termica particolarmente per etichette.
US5106216A (en) * 1989-11-22 1992-04-21 Samsung Electronics Co., Ltd. Device for driving a platen and carriage of a printing machine
JP3334185B2 (ja) * 1991-10-14 2002-10-15 セイコーエプソン株式会社 プリンタ
CA2130762C (en) * 1994-08-24 1999-07-06 Eva Anne Turley Treatment of disease and conditions associated with macrophage infiltration
US5433543A (en) * 1993-10-29 1995-07-18 Hewlett-Packard Company Media feed and carriage motion mechanism for shuttle-type printers
JPH08267871A (ja) * 1995-02-03 1996-10-15 Alps Electric Co Ltd サーマルプリンタ

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1000641B (it) * 1973-12-28 1976-04-10 Olivetti & Co Spa Unita di stampa elettrotermica di tipo perfezionato
FR2300678A1 (fr) * 1975-02-13 1976-09-10 Logabax Dispositif d'impression pour imprimantes rapides
JPS5829761B2 (ja) * 1975-08-13 1983-06-24 住友化学工業株式会社 含水殺虫組成物
CA1122477A (en) * 1978-02-27 1982-04-27 Akira Katsura Printer
IT1108649B (it) * 1978-04-14 1985-12-09 Olivetti C Ing E C Spa Dispositivo di stampa a punti
GB2046177B (en) * 1979-03-26 1983-04-20 Seiko Instr & Electronics Printer
FR2457772A1 (fr) * 1979-05-31 1980-12-26 Enertec Dispositif d'impression a deplacement transversal relatif d'une tete d'impression et d'un support d'impression applique sur un rouleau

Also Published As

Publication number Publication date
FR2498524B1 (fr) 1986-07-25
DE3261980D1 (en) 1985-03-07
EP0057118A3 (en) 1982-08-18
US4420763A (en) 1983-12-13
JPS57144781A (en) 1982-09-07
EP0057118A2 (de) 1982-08-04
FR2498524A1 (fr) 1982-07-30

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