EP0947343B1 - Imprimante, en particulier imprimante à matrice d'aiguilles - Google Patents

Imprimante, en particulier imprimante à matrice d'aiguilles Download PDF

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Publication number
EP0947343B1
EP0947343B1 EP98124395A EP98124395A EP0947343B1 EP 0947343 B1 EP0947343 B1 EP 0947343B1 EP 98124395 A EP98124395 A EP 98124395A EP 98124395 A EP98124395 A EP 98124395A EP 0947343 B1 EP0947343 B1 EP 0947343B1
Authority
EP
European Patent Office
Prior art keywords
print
holder
recording medium
print head
head
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 - Lifetime
Application number
EP98124395A
Other languages
German (de)
English (en)
Other versions
EP0947343A2 (fr
EP0947343A3 (fr
Inventor
Klaus Otto Brandenburg
Peter Schattmann
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.)
PSI Printer Systems International GmbH
Original Assignee
PSI Printer Systems International GmbH
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 PSI Printer Systems International GmbH filed Critical PSI Printer Systems International GmbH
Publication of EP0947343A2 publication Critical patent/EP0947343A2/fr
Publication of EP0947343A3 publication Critical patent/EP0947343A3/fr
Application granted granted Critical
Publication of EP0947343B1 publication Critical patent/EP0947343B1/fr
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
    • B41J25/00—Actions or mechanisms not otherwise provided for
    • B41J25/304—Bodily-movable mechanisms for print heads or carriages movable towards or from paper surface
    • B41J25/308—Bodily-movable mechanisms for print heads or carriages movable towards or from paper surface with print gap adjustment mechanisms
    • B41J25/3082—Bodily-movable mechanisms for print heads or carriages movable towards or from paper surface with print gap adjustment mechanisms with print gap adjustment means on the print head carriage, e.g. for rotation around a guide bar or using a rotatable eccentric bearing
    • 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
    • B41J25/304—Bodily-movable mechanisms for print heads or carriages movable towards or from paper surface
    • B41J25/308—Bodily-movable mechanisms for print heads or carriages movable towards or from paper surface with print gap adjustment mechanisms

Definitions

  • the invention relates to printers, in particular matrix dot matrix printers with a longitudinally displaceable holder mounted on a guide, in particular a guide shaft for receiving the printhead, which is driven by a drive parallel to one with a Record carrier occupied pressure abutment is moved, the distance between the printhead tip and the platen (pressure gap), taking into account the strength of the inserted recording medium by means of a Sensor controlled actuator assigned to the printhead holder to a required one Value is set.
  • the invention relates to methods by means of which the pressure gap and the touch strength can be adjusted.
  • a scanning element is used, which consists of a the one end of a probe lever rotatably mounted, acted upon by a spring force Tactile role exists.
  • the sensing element has an indicator with the sensor an electronic circuit for generating an analog signal cooperates.
  • the indicator consists of a soft iron part that works with a sensor, which consists of a field plate differential sensor.
  • DE-C2- 40 25 483 describes a printing device in which the pressure gap setting is controlled depending on probes made up of a magnet and a Hall probe.
  • the Hall probe is on an elastically deformable Pressure plate mounted, the free end mechanically against the Surface of the record carrier is present.
  • the associated magnet is rigid connected to the printhead or its holder.
  • the invention has for its object a printer with a device for setting of the pressure gap, which provide a high degree of operational reliability guaranteed, works precisely and is simple to set up,
  • the object is described in a printer of the input Art solved in that the sensor from an associated with the printhead holder Tactile finger and an electrical transmitter actuated by this, the Touch finger is arranged such that it changes position, esp.
  • the bearing play between the guide and the holder of the printhead and the encoder detects a control signal returns when the printhead moves against the actuator moved the surface of the record carrier or the pressure abutment as a stop and so that the printhead holder is raised relative to the guide.
  • a holder for the print head which has a guide sleeve slides on a guide shaft.
  • the touch finger can then be arranged in this way be that he through a bottom opening in the sleeve or close to the edge of the Sleeve pressed by its own weight or a spring against the guide shaft becomes.
  • the print head is driven by an actuator against the record carrier or the print abutment is pressed, the holder of the print head is in the frame the game between the guide shaft and sleeve slightly raised and thus the Touch finger moves.
  • the touch finger transfers the small movement to an electrical encoder, the Signal the reached, defined position of the print head from the position of the actuator detected.
  • the touch finger is designed as a rocker arm, it is advantageous that Arrange the bearing of the lever so that the lever part on the guide shaft is applied to the lever part that acts on the electrical encoder, a mechanical Translation of, for example, 1: 3 results.
  • At least the one against the guide shaft Touch finger is advantageously made of a very slidable, low-abrasion plastic formed or equipped with one,
  • FIG. 2 shows a perspective illustration, partly in section, of a Print head holder for a dot matrix printer.
  • the same or similar parts are in both Figures with the same reference numerals.
  • Fig. 1 shows a holder 1 for the printhead 2 with its printhead tip 3.
  • the Printhead 2 is elastically supported in the holder 1 via springs 4.
  • a not shown Ribbon holder is assigned to printhead tip 3.
  • the pressure abutment 6 is arranged.
  • a record carrier 5 usually a paper tape, laid in one or more layers.
  • the Printhead 2 can be opposite by a schematically indicated actuator 7 the holder 1 and thus relative to the pressure abutment 6 for setting the pressure gap be moved.
  • a stepper motor is used as a drive for the actuator 7, so a step counter can not only the position of the print head 2 at Apply to a recording medium 5 and opposite the pressure abutment 6 capture, but also the return movement of the print head 2 for the setting of Monitor and control the pressure gap.
  • the holder 1 for the print head 2 is in the printer housing on a guide shaft 8 stored using a guide sleeve 9.
  • a touch finger 10 is arranged in the region of an opening in the wall of the sleeve 9.
  • the touch finger 10 is designed as a lever and is rigidly connected to the holder 1 Axis 11 pivotally mounted. With the end 12, the touch finger 10 rests the guide shaft 8 and with the end 13 on the tilting movement of the finger 10 detecting electrical encoder 14.
  • the dead weight of the touch finger 10 and a spring 15, which may be additionally used, ensure good installation of the touch finger end 12 to the guide shaft 8. Since the end 12 of the touch finger 10 constantly slides on the guide shaft 8 in the printing mode, it is advantageous the finger 10 or at least the adjacent end 12 from a low-abrasion, easy to slide To manufacture plastic.
  • the gap is very small, 10 ⁇ m to a maximum of 30 ⁇ m, so much smaller than in the schematic Drawing shown for better understanding.
  • the little, alone for reasons of good sliding properties of the print head holder 1 with its sleeve 9 opposite the guide shaft 8 inevitably existing game shows that the sleeve 9th supported by the weight of the holder 1 together with the print head 2 and, if necessary by the force of the spring 15, rests on top of the guide shaft 8 and below the drawn gap forms.
  • the print head 2 If the print head 2 is actuated by the actuator 4 against the recording medium 5 or the pressure abutment 6 moves, when the print head tip 3 is placed on the Pressure abutment 6, or the recording medium 5 of the print head holder 1 with its Sleeve 3 raised by the small tolerance gap. This will be the end 12 of the Touch fingers 10 moved down.
  • the associated stroke of the end 13 against the force of the spring 15 actuates the electrical transmitter 14.
  • the spring 15 should be designed to be comparatively strong. This ensures that in printing operation in which the needles against the recording medium 5th beat, no lifting of the holder 1 relative to the guide shaft 8 and thus there is also no signal from the transmitter 14.
  • the position of the surface of the recording medium can be 5 determine very precisely about the position of the actuator 4, so that also the setting of a defined printing gap with respect to the recording medium 5 can be done precisely by the actuator 4 without adjusting the components beforehand.
  • FIG. 2 are the parts described with the schematic drawing of FIG. 1, provided with the same names.
  • this figure is a guide profile 16 that prevents the holder 1 from tipping over the guide shaft 8.
  • the skid-like parts 17 accommodate the retaining springs 4 of the print head 2.
  • the breakthroughs 18 is a worm shaft used as part of the actuator 4 vertical adjustment of the print head 2 takes place.
  • the holder 1 forms a receptacle 19 for the printhead, not shown in this figure.
  • the actuator 4 not only move the print head 2 against the pressure abutment 6 must, but also ensure a very precise adjustment of the pressure gap if it is appropriate to use a stepper motor for the actuator 4 and Make adjustment movements in the pilgrim step.
  • a method can be carried out in a simple manner to adjust the pressure gap.
  • the printhead 2 is used in this process by the actuator 4 in a rest position, for. B. at the end of a line, against the pressure abutment 6 occupied with the recording medium 5 until the Guide sleeve 9 of the print head holder 1 is raised relative to the guide shaft 8 and thus a signal is triggered via the touch finger 10.
  • the signal is the Movement of the actuator 4 and thus also the print head 2 stopped reached position and then the print head 2 by the actuator 4, preferably in the mitage step, to a defined print distance from the recording medium 5 set.
  • the pressure gap can also be set during printing.
  • the printing operation needs z. B. only briefly interrupted in a line connection and the print head 2 are moved against the recording medium 5.
  • the so The measurement data obtained allow the pressure gap to be set so quickly that practically no interruption in pressure can be determined.

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  • Common Mechanisms (AREA)

Claims (9)

  1. Imprimante, en particulier imprimante matricielle, avec un support transporté en mouvement longitudinal sur un guide, destiné à recevoir la tête d'impression, qui est mue par un système d'entraínement parallèlement à une table d'impression garnie d'un support d'écriture, dans laquelle la distance entre la pointe de la tête d'impression et la table d'impression (fente d'impression) est réglée à une valeur nécessaire, en tenant compte de l'épaisseur du support d'écriture introduit, par un servomoteur associé au support de la tête d'impression et piloté par un capteur, caractérisée en ce que le détecteur se compose d'un doigt palpeur (10) associé au support de la tête d'impression (1) et d'un capteur électrique (14) actionné par celui-ci, en ce que le doigt palpeur (10) est disposé de telle manière qu'il détecte les changements de position, en particulier le jeu de l'appui entre le guide (8) et le support (1) de la tête d'impression (2) et en ce que le capteur (14) fournit un signal de commande, lorsque la tête d'impression (2) est, lors d'un mouvement par le servomoteur (4), amenée à butée contre la surface du support d'écriture (5) et que le support de tête d'impression (1) est ainsi soulevé.
  2. Imprimante suivant la revendication 1, caractérisée en ce que le support (1) pour la tête d'impression (2) forme une douille de guidage (9) pour un arbre de guidage (8) et en ce que le doigt palpeur (10) s'applique contre l'arbre de guidage (8) près du bord de la douille de guidage (9) ou à travers un évidement dans la paroi de celle-ci, de préférence sous la charge de son propre poids ou d'un ressort (15).
  3. Imprimante suivant la revendication 1 et 2, caractérisée en ce que le doigt palpeur (10) a la forme d'un levier pivotant appuyé sur le support de tête d'impression (1), qui s'applique d'une part contre l'arbre de guidage (8) et est d'autre part couplé à un capteur électrique (14).
  4. Imprimante suivant une revendication 1 à 3, caractérisée en ce que le doigt palpeur (10) peut pivoter sur le support de tête d'impression (1) d'une manière telle qu'il existe un rapport de transmission mécanique depuis le doigt palpeur (10) sur l'arbre de guidage (8) jusqu'au capteur électrique (14).
  5. Imprimante suivant une revendication 1 à 4, caractérisée en ce qu'au moins la partie (12) du doigt palpeur (10) appliquée sur l'arbre de guidage (8) se compose d'une matière plastique bien glissante résistant à l'usure.
  6. Imprimante suivant la revendication 5, caractérisée en ce que le capteur électrique (14) est un élément piézo-électrique.
  7. Imprimante suivant la revendication 5, caractérisée en ce que le capteur (14) est une jauge d'allongement, de préférence sous la forme d'un élément résistant déposé par pulvérisation.
  8. Procédé pour le réglage de la fente d'impression dans une imprimante suivant une revendication 1 à 7, caractérisé en ce que la tête d'impression (2) est amenée par le servomoteur (4), dans une position de repos, par exemple à une fin de ligne, contre la table d'impression (6) garnie du support d'écriture (5), jusqu'à ce que la douille de guidage (9) du support de tête d'impression (1) soit soulevée par rapport à l'arbre de guidage (8) et qu'ainsi un signal soit émis par le doigt palpeur (10), signal qui provoque l'arrêt du mouvement du servomoteur (4) et dès lors aussi de la tête d'impression (2), dont la position atteinte est détectée et la tête d'impression (2) est alors réglée par le servomoteur (4), de préférence au pas de pèlerin, à une distance d'impression déterminée par rapport au support d'écriture (5).
  9. Procédé pour le réglage de la force de frappe d'une imprimante à aiguilles en fonction de l'épaisseur de dépôt formée par le support d'écriture (5) sur la table d'impression (6), en utilisant une imprimante suivant une revendication 1 à 7, caractérisé en ce que la tête d'impression (2) est d'abord menée latéralement à côté du support d'écriture (5) par le servomoteur (4), en ce qu'elle est déplacée contre la table d'impression (6) jusqu'à ce que le capteur (14) réagisse, en ce que cette position du servomoteur (4) est ensuite comparée à la position du servomoteur (4) après l'application de la tête d'impression (2) contre la table d'impression (6) garnie du support d'écriture (5) et en ce que la force de frappe est réglée en fonction de la différence de position.
EP98124395A 1998-03-28 1998-12-22 Imprimante, en particulier imprimante à matrice d'aiguilles Expired - Lifetime EP0947343B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19813899A DE19813899A1 (de) 1998-03-28 1998-03-28 Drucker, insbesondere Matrix-Nadeldrucker
DE19813899 1998-03-28

Publications (3)

Publication Number Publication Date
EP0947343A2 EP0947343A2 (fr) 1999-10-06
EP0947343A3 EP0947343A3 (fr) 2000-02-02
EP0947343B1 true EP0947343B1 (fr) 2002-03-13

Family

ID=7862767

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98124395A Expired - Lifetime EP0947343B1 (fr) 1998-03-28 1998-12-22 Imprimante, en particulier imprimante à matrice d'aiguilles

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EP (1) EP0947343B1 (fr)
DE (2) DE19813899A1 (fr)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3830880A1 (de) * 1988-09-08 1990-03-15 Mannesmann Ag Drucker, insbesondere matrixnadeldrucker, mit einer druckkopfabstandseinstelleinrichtung
DE3913073A1 (de) * 1989-04-21 1990-10-25 Philips Patentverwaltung Verfahren zur einstellung eines druckspaltes bei einem drucker
DE4025483C2 (de) * 1990-08-10 1995-03-16 Siemens Nixdorf Inf Syst Druckeinrichtung
JPH04282261A (ja) * 1991-03-08 1992-10-07 Brother Ind Ltd 印字ヘッドにおける印字隙間検出装置
JPH04355177A (ja) * 1991-05-31 1992-12-09 Brother Ind Ltd 印字ヘッドのギャップ調整装置

Also Published As

Publication number Publication date
EP0947343A2 (fr) 1999-10-06
DE19813899A1 (de) 1999-09-30
EP0947343A3 (fr) 2000-02-02
DE59803330D1 (de) 2002-04-18

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