EP0016995B1 - Mécanisme d'entraînement et de guidage d'une tête à aiguilles d'une imprimante à aiguiller - Google Patents

Mécanisme d'entraînement et de guidage d'une tête à aiguilles d'une imprimante à aiguiller Download PDF

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Publication number
EP0016995B1
EP0016995B1 EP80101133A EP80101133A EP0016995B1 EP 0016995 B1 EP0016995 B1 EP 0016995B1 EP 80101133 A EP80101133 A EP 80101133A EP 80101133 A EP80101133 A EP 80101133A EP 0016995 B1 EP0016995 B1 EP 0016995B1
Authority
EP
European Patent Office
Prior art keywords
guide
needle head
rope
drive
driving pulley
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
EP80101133A
Other languages
German (de)
English (en)
Other versions
EP0016995A3 (en
EP0016995A2 (fr
Inventor
Fritz Siegenthaler
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.)
Ascom Autelca AG
Autelca AG
Original Assignee
Ascom Autelca AG
Autelca AG
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 Ascom Autelca AG, Autelca AG filed Critical Ascom Autelca AG
Publication of EP0016995A2 publication Critical patent/EP0016995A2/fr
Publication of EP0016995A3 publication Critical patent/EP0016995A3/de
Application granted granted Critical
Publication of EP0016995B1 publication Critical patent/EP0016995B1/fr
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
    • 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
    • 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
    • B41J29/00—Details of, or accessories for, typewriters or selective printing mechanisms not otherwise provided for
    • B41J29/02—Framework

Definitions

  • the invention relates to a drive and guide device for a needle head of a dot matrix printer, which belongs to the type specified in the preamble of claim 1.
  • a drive device of this type for a printer head is known (DE-A-2 306 036), which has a cable deflection from one strand to another at each end of the guide, and its drive motor with the traction sheave in the longitudinal center of the guide with its shaft is arranged at right angles to the dreams.
  • Empty spaces are inevitable on both sides of the drive motor, and the housing dimension of the printer across the printer head guide becomes larger, i. H. the housing becomes higher or longer in the direction of the guide for the record carrier, in particular paper guide, which also makes this guide longer, and faults e.g. are much more difficult to fix due to foreign bodies or folds in the record carrier.
  • To attach the drive motor to the dot matrix printer chassis it must be equipped with suitable suspension elements.
  • the invention seeks to remedy this.
  • the invention as characterized in claims 1 to 3, solves the problem of creating a drive device for a needle head of a needle printer, which takes up less space, makes better use of the space of the dot matrix printer housing and a shorter guide for the recording medium and easier attachment of the drive motor enables.
  • the further development of the guides for the needle head specified in claim 4 is reliable and simple, in particular the two guides do not need to run exactly parallel, nevertheless jamming is excluded and the guides are much less susceptible to faults when contaminated. Overall, the device is characterized by a simple, compact design.
  • the needle head 1 of the dot matrix printer is in a position which corresponds approximately to the center of a line to be printed.
  • the needles of the needle head 1 print at the printing point 2 by means of an ink ribbon on a paper which is pushed onto an underlay 4 through an insertion slot 3. Paper, ribbon, ribbon guide and feed device and a possible paper cutter are not shown. Only the drive motor 5 of the paper conveyor device is shown in outline.
  • the working end 6 of the needle head 1 facing the pressure point 2 (lower in the drawing) is guided on a round rod 7 by means of two pairs of rollers 8 and 9.
  • the rollers 8 are arranged on the side of the round rod 7 facing the pressure point 2 and are rotatably mounted on axles 10 which are firmly connected to the needle head 1. They have a circumferential groove which is V-shaped in cross-section and, together with the round rod 7, absorb the reaction force which occurs during the printing process, relentlessly supporting the needle head 1 in the direction of this force.
  • the rollers 9 are each rotatably mounted on axes 11 in a fork-shaped slotted end of a prestressed leaf spring 12, the center of which is firmly connected to the needle head 1 by a bolt 13.
  • the bias of the leaf spring 12 is greater than the force of gravity of the needle head 1 to ensure that it is guided securely.
  • the needle head 1 is guided on the (upper) end facing away from its (lower) working end 6 so that it can be displaced against rotation about the round rod 7 by means of a slide 14 on a guide bar 15.
  • the slide 14 only needs to slide laterally on the bar, since the weight of the needle head 1 is borne by the rollers 9.
  • the bar 15 has a much greater distance from the round rod 7 than the pressure point 2, so that a sufficiently precise positioning (perpendicular to the plane of FIG. 1) of the (lower) working end 6 of the needle head 1 with a slight play of the slide 14 on the Bar 15 is reached, in which the sliding friction is negligible and there is no susceptibility to interference from contamination.
  • the needle head 1 is slidably mounted along its guide 7, 15 and is rigidly supported by the rollers 8 against the reaction force occurring during the printing process, so that the entire pressure force of the needles can be used.
  • a double pulley 17 is rotatably mounted directly above the rollers 9.
  • the arrangement of the pulleys 19, 23 and 24 results in a known manner from the position of the double-grooved pulley 17 and the traction sheave 26 and the rope course described below.
  • One end 29 of a stretch-resistant (ie practically inextensible) rope is on the sides wall 18, the other end of the rope 30 is attached to the intermediate wall 22.
  • the rope runs from one end 29 in a first section 31 parallel to the round rod 7 to the double grooved rope pulley 17, wraps around it in one of its grooves by 180 °, runs in a second section 32 to the rope pulley 19, at which it is again deflected by 180 ° , so that the next, third section 33 again runs parallel to the round rod 7.
  • the rope on the sheave 23 is deflected by approximately 90 ° to the traction sheave 26, which it wraps around the screw groove several times, whereupon it is deflected by the sheave 24 by approximately 90 °, and again in a fourth section 34 parallel to Round rod 7 runs in the other groove of the double grooved rope pulley 17, wraps around it by 180 °, followed by the last, fifth section 35, which extends to the other rope end 30.
  • the section 31 is aligned with the section 35 and the section 32 with the section 34, apart from a small parallel displacement, which is caused by the distance between the two grooves of the double pulley 17.
  • the cable runs between the sections 31 and 32 around a circumferential half and between sections 34 and 35 around the other circumferential half of the double pulley 17.
  • the sections 31, 32, 34 and 35 must run parallel to the round rod 7 so that the tension of the cable remains constant when the needle head 1 runs along the guide rod 7 and bar 15 when printing a line.
  • the location of the cable is fixed, which lies in the middle of the cable section wound on this traction sheave 26 when the needle head 1 is in the middle of its path running along the rod 7 and bar 15.
  • the rope is expediently guided through one of two adjacent radial bores of a hollow cylindrical body of the traction sheave, which has the screw groove on the outside, into the interior thereof and out through the other bore.
  • the rope section wound in the screw groove must be at least four times as long as the displacement path of the needle head 1, since for the entire displacement path on one side of the point at which the rope is attached to the traction sheave 26, a rope section twice the length of this path is wound and on the other side of this point as much rope has to be unwound.
  • the cable drive described is as such free of play, without any significant friction and not susceptible to faults, in particular not sensitive to dust and other contaminants.
  • the needle head 1 is held directly with respect to shocks in the direction of displacement on four cable sections 31, 32, 34 and 35.
  • the tensile force acting on the traction sheave 26 when the needle head 1 is shaken, the torque of which the motor has to withstand, is only half the force caused by the inertia of the needle head 1. Since the ends 29 and 30 of the rope are held stationary, the rope is fixed to the traction sheave 26, and the rope tension acts in opposite directions on the double-groove rope sheave 17 on the needle head 1, the rope slips, which affects the position of the needle head 1 could impact, reliably prevented.
  • the radius of the sheaves 17, 19, 23, 24 and also the traction sheave 26 can be dimensioned relatively large despite the compact construction. This is essential for the selection of the rope material and the lifespan of the rope as well as for a safe positioning of the needle head 1 in the direction of the rope pull.
  • a sleeve 36 is formed which receives the end of the connecting cable 37 of the needle head which is connected to the needle head 1.
  • the other end of the cable is supported in a stationary manner (not shown).
  • This cable has a sheath formed by a (only partially shown) coil spring 38 and is U-shaped with its legs in the uppermost part of the housing between the side walls 18 and 25 and the front and rear wall, not shown, in the plan view (plan view), not shown arranged parallel to the rod 7 and bar 15 and held elastically by means of the coil spring 38.

Landscapes

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

Claims (5)

1. Dispositif d'entraînement et de guidage pour une tête à aiguilles d'une imprimante à aiguilles comprenant un dispositif de guidage (7, 15) parallèle à la direction des lignes, sur lequel la tête à aiguilles (1) peut être déplacée par un dispositif d'entraînement par câble (19, 26, 31-35) dont chaque extrémité du câble est fixée à une extrémité du dispositif de guidage (7), et qui comprend des brins (33, 32/34) parallèles au dispositif de guidage (7, 15), un renvoi de câble (19) entre un brin (32) et un autre brin (33) à une extrémité du dispositif de guidage (7) et une poulie d'entraînement (26) entraînée par un moteur réversible (28), caractérisé en ce que le moteur d'entraînement (28) avec la poulie d'entraînement (26) est disposé à l'autre extrémité du dispositif de guidage (7), son arbre (27) étant parallèle audit dispositif de guidage (7), en vue du déplacement de la tête à aiguilles (1) qui est guidée par frottement de roulement (8, 9) sur le dispositif de guidage (7), et deux autres poulies (24, 23) qui sont disposées à cette autre extrémité du dispositif de guidage (7) renvoyant le câble depuis un brin (34) en direction de la poulie d'entraînement (26) et depuis cette dernière (26) vers un autre brin (33).
2. Dispositif selon la revendication 1, dans lequel le moteur d'entraînement (28) comprenant la poulie d'entraînement (26), et un moteur d'entraînement (5) monté sous ce dernier et destiné à l'avance du support d'enregistrement, sont disposés sur une paroi latérale (25) du châssis de l'imprimante à aiguilles.
3. Dispositif selon la revendication 1 ou 2, dans lequel le câble de raccordement flexible (37) de la tête à aiguilles (1) a la forme d'un U entre son extrémité fixée à la tête à aiguilles (1) et son extrémité fixe, les branches du U étant parallèles au dispositif de guidage (7, 15), et est maintenu élastiquement par un ressort hélicoïdal (38) entourant ledit câble de raccordement (37).
4. Dispositif selon la revendication 1, 2 ou 3, dans lequel la tête à aiguilles (1) est guidée à proximité de la position d'impression (2) au moyen de galets (8, 9) sur un premier dispositif de guidage (7) et est guidé de façon glissante à son extrémité qui est à l'opposé de la position d'impression (2) sur deux surfaces d'un second dispositif de guidage (15) qui sont perpendiculaires au plan du support d'enregistrement.
5. Dispositif selon la revendication 4, dans lequel l'emplacement (17) où l'entraînement par câble (31, 32, 34, 35) est raccordé à la tête à aiguilles (1) est à une distance plus faible du premier dispositif de guidage (7) et à une distance plus importante du second dispositif de guidage (15).
EP80101133A 1979-03-30 1980-03-06 Mécanisme d'entraînement et de guidage d'une tête à aiguilles d'une imprimante à aiguiller Expired EP0016995B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH296879 1979-03-30
CH2968/79 1979-03-30

Publications (3)

Publication Number Publication Date
EP0016995A2 EP0016995A2 (fr) 1980-10-15
EP0016995A3 EP0016995A3 (en) 1981-01-07
EP0016995B1 true EP0016995B1 (fr) 1984-08-22

Family

ID=4245691

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80101133A Expired EP0016995B1 (fr) 1979-03-30 1980-03-06 Mécanisme d'entraînement et de guidage d'une tête à aiguilles d'une imprimante à aiguiller

Country Status (4)

Country Link
US (1) US4303347A (fr)
EP (1) EP0016995B1 (fr)
JP (1) JPS55132292A (fr)
DE (1) DE3068989D1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4353262A (en) * 1981-06-10 1982-10-12 Mannesmann Tally Corporation Rotary/linear shuttle mechanism
US4468144A (en) * 1982-06-09 1984-08-28 Contitronix, Inc. Detachable carriage assembly for printer
US4466753A (en) * 1982-09-24 1984-08-21 Willcox Frederick P Carriage guiding system and frame for a printer
US4547089A (en) * 1983-08-19 1985-10-15 At&T Teletype Corporation Guide for a print head of a printing device
JPS60150052U (ja) * 1984-03-14 1985-10-05 シチズン時計株式会社 プリンタのキヤリツジ装置
DE3520569C1 (de) * 1985-06-07 1987-01-08 Siemens Ag Spielfreier Antrieb fuer Druckerwagen in Zeilendruckeinrichtung
GB2183771B (en) * 1985-11-30 1990-05-16 Burroughs Corp Printhead transport apparatus
CN114475021B (zh) * 2022-01-27 2022-09-06 广东顶峰精密技术有限公司 笔记本电池标加工用定位装置

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2353151A (en) * 1940-06-06 1944-07-11 Manning Bowman & Co Electric flatiron and the like
US3393459A (en) * 1965-07-01 1968-07-23 Bendix Corp Probe and probe holding device for a coordinate measuring machine
BE795860A (fr) * 1972-02-25 1973-08-23 Xerox Corp Machines a imprimer a grande vitesse avec cable de chariot a compensation de deplacement
US3885661A (en) * 1972-11-30 1975-05-27 Copal Co Ltd Printing head feeding mechanism for printers
DE2358682A1 (de) * 1973-11-24 1975-05-28 Philips Patentverwaltung Antriebsvorrichtung zur fortschaltung des sich bewegenden teiles einer druckvorrichtung
JPS50158418A (fr) * 1974-06-10 1975-12-22
DE2438735C3 (de) * 1974-08-13 1981-09-10 Philips Patentverwaltung Gmbh, 2000 Hamburg Seriendruckwerk
US4030590A (en) * 1975-10-03 1977-06-21 Ncr Corporation Spacing and connecting a plurality of print heads
DE2558380A1 (de) * 1975-12-23 1977-07-07 Ncr Co Vorrichtung zum punktweisen einwirken auf einen informationstraeger
JPS52121404A (en) * 1976-04-05 1977-10-12 Ricoh Kk Carriage feeding mechanism for printer
US4189244A (en) * 1977-11-21 1980-02-19 Data Products Corporation Platen gap adjuster

Also Published As

Publication number Publication date
JPS55132292A (en) 1980-10-14
US4303347A (en) 1981-12-01
DE3068989D1 (en) 1984-09-27
EP0016995A3 (en) 1981-01-07
EP0016995A2 (fr) 1980-10-15

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