EP0542811B1 - Dispositif d'impression a tete d'impression reglable - Google Patents

Dispositif d'impression a tete d'impression reglable Download PDF

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Publication number
EP0542811B1
EP0542811B1 EP91914103A EP91914103A EP0542811B1 EP 0542811 B1 EP0542811 B1 EP 0542811B1 EP 91914103 A EP91914103 A EP 91914103A EP 91914103 A EP91914103 A EP 91914103A EP 0542811 B1 EP0542811 B1 EP 0542811B1
Authority
EP
European Patent Office
Prior art keywords
print head
platen
recording medium
printing device
hall voltage
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
EP91914103A
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German (de)
English (en)
Other versions
EP0542811A1 (fr
Inventor
Udo Petermann
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.)
Wincor Nixdorf International GmbH
Original Assignee
Wincor Nixdorf 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 Wincor Nixdorf International GmbH filed Critical Wincor Nixdorf International GmbH
Publication of EP0542811A1 publication Critical patent/EP0542811A1/fr
Application granted granted Critical
Publication of EP0542811B1 publication Critical patent/EP0542811B1/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

Definitions

  • the invention relates to a printing device according to the preamble of claim 1.
  • a device for adjusting the section of a print head in a matrix printer in which a sensor intended for contact with the surface of the record carrier is arranged on the print head carrier.
  • the print head carrier can be adjusted with the help of an eccentric adjustment mechanism in the direction of the print abutment and away from it.
  • To determine the thickness of the recording medium it is first drawn into the printing position.
  • the printhead carrier is then moved to a reference position furthest away from the platen, which is determined by means of a light barrier. The distance of the sensor surface from the pressure abutment in this reference position is fixed and known.
  • the print head carrier is then moved in the direction of the print abutment, until the sensor rests on the surface of the record carrier that has now been drawn in with a certain contact pressure, the distance covered up to this point being measured by means of a counter. This measured distance is then subtracted from the previously known reference distance in the computing device. The difference corresponds to the thickness of the recording medium. On the basis of the value for the thickness of the record carrier determined in this way, the print head carrier is then moved away from the print abutment again until the desired distance between the print head and the surface of the record carrier is set.
  • a sensor has already been proposed in a device of the type known from US Pat. No. 4,676,675 - viewed in the feed direction of the record carrier - to be arranged in front of the print position on a part fixed to the printer frame relative to the platen in such a way that it rests on the platen when the record carrier has not yet been pulled in and can be deflected or deformed by the retracted record carrier, the deflection or deformation of the sensor being proportional electrical quantity is implemented.
  • the sensor proposed in this solution comprises moving parts which can become contaminated by the inevitably occurring paper dust and thereby block. Furthermore, these mechanical parts would have to be adjusted.
  • a device for controlling the distance of a printhead from a recording medium in which a sensor in the form of a two-armed lever is pivotally mounted on the printhead carrier or the printhead carriage so that it has one free lever end can rest on the record carrier in the area of the respective printing point.
  • the sensor is formed from a thin sheet of metal which is pressed against the recording medium by a spring with a very low contact pressure, so that the sensor can slide over the paper almost without resistance.
  • the sheet has a recess at its support point, through which the needles of the print head can pass. At its lever end facing away from the support point, this sensor carries a magnet which interacts with a Hall probe arranged on the print head carrier.
  • An electronic control circuit moves the print head carrier or the print head carriage perpendicular to the print abutment until a desired voltage corresponding to a predetermined distance of the print head from the recording medium occurs on the Hall probe.
  • This solution has considerable disadvantages in practical operation.
  • the sensor is only allowed to lightly touch the surface of the record carrier rest, otherwise it could hinder the movement of the print head and damage the record carrier during the movement of the print head.
  • it is precisely this low contact pressure that causes the sensor to respond to any unevenness in a record carrier. This is particularly noticeable in the case of multi-layer record carriers, for example form sets or savings books.
  • the invention has for its object to further improve a device of the type specified in the preamble of claim 1 in such a way that moving parts of the sensor, which require mechanical adjustment, can be eliminated and that the device is simple in construction and robust in operation.
  • the solution according to the invention has the advantage that the sensor works without contact and does not require any mechanical parts that would have to be adjusted and whose function could be impaired by paper dust.
  • Both parts of the Hall sensor are arranged on already existing parts of the printing device, namely on the one hand on the pressure element and on the other hand on the print head or print head carriage.
  • the pressure element is so tightly clamped against the pressure abutment that it presses the record carriers to be processed flat against the pressure abutment.
  • the measurement is not falsified by dents, kinks or folds in the record carrier, since it is flattened in any case.
  • the spring which prestresses the pressure element in the direction of the pressure abutment must be relatively strong, slight deviations from the usual spring force also play no role. Adjustment is therefore relatively uncritical.
  • Attaching one part of the Hall sensor to the pressure element ensures that the adjustment of the print head spacing can already take place while the recording medium is still being drawn into its printing position. When it has reached this, the print head is also set to the correct distance. This avoids a time delay when setting the print head spacing.
  • the pressure abutment can be a platen roller in a manner known per se, the pressure element preferably being an elastically deformable pressure plate which extends over the entire width of the pressure abutment.
  • a second Hall probe which is thermally coupled to the first Hall probe, is preferably provided on the pressure element outside the region which the print head traverses as it moves along the pressure abutment.
  • the good thermal coupling between the two Hall probes makes it possible to use the output signal of the second probe to compensate for the temperature response of the first probe.
  • the invention further relates to a method for setting and maintaining a predetermined distance of a print head of a printing device from a recording medium according to claims 11 and 12.
  • FIGS. 1 and 2 one can see a platen roller designated 10 serving as a pressure abutment.
  • a print head guide 14 Parallel to the shaft 12 of the platen roller 10, a print head guide 14 is arranged in front of it, which is mounted with eccentric bearings 16, 18 in side plates 20, 22 of a printer frame.
  • a pinion 24 is arranged in a rotationally fixed manner, with a second pin on the output shaft a step motor 28 combs pinion 26 seated.
  • a carrier 30 is mounted axially displaceably on the print head guide 14 and in turn carries a needle print head 32.
  • An elastically deformable pressure plate 36 is located below the mouthpiece 34 of the needle print head 32. This extends over the entire writing width of the printer. At its lower edge 38, it is fixedly connected to a crossbar 40 of the printer frame extending between the side plates 20, 22 and, near its upper edge, tangentially touches the platen roller 10 in a line of contact 42 (FIG. 2) immediately below the print head mouthpiece 34. The upper edge 44 of the pressure plate 36 is bent obliquely away from the platen roller 10 above the contact line 42.
  • paper guides 46, 48 are arranged on both sides of the print head mouthpiece 34, the upper ends 50 of the print roller 10, which are located at a short distance from each other, are adapted to the contour of the print roller 10 (FIG. 2).
  • the arrangement of the pressure plate 36 and the paper guides 46, 48 described above ensures that a recording medium 52 clings closely to the platen roller 10 in the printing area.
  • a permanent magnet 54 is inserted into the left paper guide 46.
  • a first Hall probe 56 is glued to the pressure plate 36. As can be seen in FIG. 2, this Hall probe 56 is located at the level of the permanent magnet 54, so that these elements face each other when the print head 32 is in a corresponding printing position along the platen roller 10.
  • a second Hall probe 58 On the pressure plate 36 is outside the area caused by the movement of the carrier 30 is swept along the print head guide 14 by the permanent magnet 54, a second Hall probe 58. Both Hall probes 56, 58 are thermally well coupled via the pressure plate 36, so that the output signal of the second probe 58 can be used to compensate for the temperature response of the first probe 56 .
  • the print head 32 In the automatic setting, the print head 32 must be in the position in which the permanent magnet 54 and the first Hall probe 56 face each other.
  • the Hall voltage is dependent on the magnetic induction and thus on the distance d (FIG. 2) between the permanent magnet 54 and the Hall probe 56.
  • This distance d is the distance of the print head mouthpiece 34 from the platen roller 10 or the surface of the recording medium 52 guided around the roller proportional.
  • the target head spacing is a specific factor for the print head used, which, depending on the head type, is between 0 mm for a thermal print head and 0.5 mm for a wire print head.
  • a certain Hall voltage value corresponds to this distance and is permanently stored in the control program for the printer controller 60 (FIG. 1).
  • a recording medium 52 is drawn into the printer from the underside of the roller. He pushes himself between the platen roller 10 and the pressure plate 36. This reduces the distance d and the Hall voltage increases.
  • the eccentrically mounted print head guide 14 is then rotated via the stepper motor 28 and the pinions 24, 26, as a result of which the Distance d changes until the Hall voltage of Hall probe 56 matches the stored target value.
  • the target head spacing is then set again. In order to compensate for the inevitable mechanical play, the head infeed is always carried out in the same direction, as the first three steps in the flow chart in FIG. 3 show.
  • the solution according to the invention was explained using an exemplary embodiment with a dot matrix printer.
  • the invention is not limited to such a dot matrix printer. Rather, it can be used with all types of printers in which the distance between the print head and platen has to be set depending on the paper thickness.

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  • Common Mechanisms (AREA)

Abstract

Un dispositif d'impression comprend une butée (10) de soutien d'un support d'enregistrement (52), une tête d'impression (32) mobile par rapport à la butée (10) dans le sens des lignes à imprimer, un organe correcteur (28, 26, 24) qui ajuste l'écartement entre la tête d'impression et la butée (10) et un élément de pression (36) qui presse le support d'enregistrement (52) sur la butée (10), de manière variable selon l'épaisseur du support d'enregistrement (52). Un aimant (54) est monté sur une des pièces (élément de pression 36, pièce 46 fixée à demeure sur la tête d'impression) et au moins une sonde de Hall (56) est montée sur l'autre pièce (pièce 46 fixée à demeure sur la tête d'impression, élément de pression 36), de sorte que l'aimant (54) et la sonde de Hall (56) puissent être amenés à un emplacement prédéterminé de la tête d'impression, où ils se recouvrent, et qui correspond à une position de mesure. Un circuit (60) de mesure de la tension de Hall et de réglage de celle-ci sur une valeur prédéterminée (tension de consigne de Hall) commande l'organe correcteur (28, 26, 24) de la tête d'impression (32) en fonction d'une différence entre la tension réelle de Hall et la tension de consigne de Hall.

Claims (12)

  1. Dispositif d'impression comportant un châssis (20, 22), un élément de contre-appui d'impression (10) maintenu dans celui-ci, destiné à soutenir un support d'impression (52), une tête d'impression (32) montée sur le châssis (20, 22) de façon à pouvoir être déplacée par rapport à l'élément de contre-appui d'impression (10) dans le sens des lignes, un dispositif de réglage (28, 26, 24) destiné au réglage de l'écart de la tête d'impression par rapport à l'élément de contre-appui d'impression (10) et un élément presseur (36) solidaire du châssis, appuyant le support d'impression (52) contre l'élément de contre-appui d'impression (10), lequel élément presseur peut être déplacé sensiblement perpendiculairement à la surface de l'élément de contre-appui d'impression (10), en correspondance avec l'épaisseur du support d'impression (52),
    caractérisé par le fait qu'
    est monté, sur l'élément presseur (36) un aimant (54), et sur une pièce (46) solidaire de la tête d'impression au moins une sonde à effet Hall (56), ou bien sur l'élément presseur (36) au moins une sonde à effet Hall et sur la pièce (46) solidaire de la tête d'impression, un aimant (54), de façon telle que l'aimant (54) et la sonde à effet Hall (56) peuvent être amenés en regard l'un de l'autre dans une position prescrite de la tête d'impression, correspondant à une position de mesure, et que l'on prévoit un circuit (60) destiné à mesurer la tension Hall et à régler celle-ci sur une tension Hall de consigne prescrite, lequel circuit commande le dispositif de réglage (28, 26, 24) de la tête d'impression (32) en fonction de la différence entre la tension Hall réelle et la tension Hall de consigne.
  2. Dispositif d'impression selon la revendication 1,
    caractérisé par le fait que l'élément de contre-appui d'impression est un rouleau d'écriture (10) et que l'élément presseur est une tôle d'application d'une pression (36) déformable élastiquement qui s'étend sur toute la longueur axiale du rouleau d'écriture (10).
  3. Dispositif d'impression selon la revendication 1 ou 2,
    caractérisé par le fait que la tête d'impression (32) est fixée sur un support susceptible d'être déplacé parallèlement à l'élément de contre-appui d'impression et que la pièce solidaire de la tête d'impression est un élément (46) de guidage du support d'impression (52) relié de façon fixe au support (30) de tête d'impression.
  4. Dispositif d'impression selon la revendication 3,
    caractérisé par le fait que le support (30) de tête d'impression, est monté sur un arbre (14) lui-même monté de façon excentrée, qui peut être mis en rotation au moyen du dispositif de réglage (28, 26, 24).
  5. Dispositif d'impression selon l'une des revendications 1 à 4,
    caractérisé par le fait qu'il est prévu une deuxième sonde (58) à effet Hall couplée thermiquement à la première soude (56) à effet Hall, sur l'élément presseur (36), en dehors de la zone que parcourt la tête d'impression (32) lors de son déplacement le long de l'élément de contre-appui d'impression (10).
  6. Dispositif d'impression selon l'une des revendications 1 à 5,
    caractérisé par le fait qu'il est prévu des moyens (60) à l'aide desquels l'écart entre la tête d'impression (32) et le support d'impression (52) peut être réglé en fonction de l'épaisseur de celui-ci.
  7. Dispositif d'impression selon la revendication 6,
    caractérisé par le fait que le circuit (60) comporte une mémoire destinée à la mise en mémoire d'une pluralité de valeurs de consigne de tension Hall qui correspondent aux différentes épaisseurs de support d'impression (52).
  8. Dispositif d'impression selon l'une des revendications 1 à 7,
    caractérisé par le fait que la tête d'impression (32) est une tête d'impression à aiguilles.
  9. Dispositif d'impression selon l'une des revendications 1 à 7,
    caractérisé par le fait que la tête d'impression est une tête d'impression thermique.
  10. Dispositif d'impression selon l'une des revendications 1 à 7,
    caractérisé par le fait que la tête d'impression est une tête d'impression à jet d'encre.
  11. Procédé de réglage et de maintien d'un écart prescrit entre une tête d'impression (32) d'un dispositif d'impression et à un support d'impression (52), le dispositif d'impression comprenant un châssis (20, 22), un élément de contre-appui d'impression (10) maintenu sur celui-ci, un dispositif de réglage (28, 26, 24) destiné au réglage de la tête d'impression (32) sensiblement perpendiculairement à l'élément de contre-appui d'impression (10), un élément presseur (36) destiné à appuyer le support d'impression (52) contre l'élément de contre-appui d'impression (10) et un capteur de distance (54, 56) destiné à détecter l'écart de la tête d'impression (32) par rapport à l'élément de contre-appui d'impression (10), ou par rapport au support d'impression (52),
    caractérisé par le fait qu'avant l'introduction du support d'impression dans le dispositif d'impression, on déplace la tête d'impression (32) parallèlement à l'élément de contre-appui d'impression (10) jusque dans une position de mesure dans laquelle un élément formant capteur, soit un aimant (54) soit une sonde à effet Hall (56), situé sur l'élément presseur (36), est amené en regard avec un élément formant capteur correspondant, soit une sonde à effet Hall (56), soit un aimant (54) fixé sur la tête d'impression, en vue de la mesure de la distance, que l'on déplace la tête d'impression (32) perpendiculairement à l'élément de contre-appui d'impression (10) jusqu'à ce que la tension réelle Hall générée par le capteur de distance soit égale à une tension Hall de consigne prescrite à l'avance, que l'on éloigne la tête d'impression (32), à partir de cette position de concordance, éloignée de l'élément de contre-appui d'impression (10) d'une distance prescrite, que l'on introduit le support d'impression (52), et que l'on déplace la tête d'impression (32) en direction de l'élément de contre-appui d'impression jusqu'à ce que la tension Hall réelle soit à nouveau en correspondance exacte avec la tension Hall de consigne, le parcours accompli à cette occasion par la tête d'impression (32) étant saisi.
  12. Procédé selon la revendication 11, caractérisé par le fait que l'épaisseur du support d'impression est établie à partir de la différence entre le parcours fixé à l'avance accompli par la tête d'impression (32) et le parcours effectué par la tête d'impression (32), le support d'impression (52) étant introduit, jusqu'à ce qu'elle atteigne la position de concordance, et par le fait que la tension Hall de consigne est réglée en fonction de l'épaisseur du support d'impression.
EP91914103A 1990-08-10 1991-08-06 Dispositif d'impression a tete d'impression reglable Expired - Lifetime EP0542811B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4025483A DE4025483C2 (de) 1990-08-10 1990-08-10 Druckeinrichtung
DE4025483 1990-08-10
PCT/EP1991/001484 WO1992002370A1 (fr) 1990-08-10 1991-08-06 Dispositif d'impression a tete d'impression reglable

Publications (2)

Publication Number Publication Date
EP0542811A1 EP0542811A1 (fr) 1993-05-26
EP0542811B1 true EP0542811B1 (fr) 1994-04-20

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ID=6412062

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Application Number Title Priority Date Filing Date
EP91914103A Expired - Lifetime EP0542811B1 (fr) 1990-08-10 1991-08-06 Dispositif d'impression a tete d'impression reglable

Country Status (5)

Country Link
US (1) US5360276A (fr)
EP (1) EP0542811B1 (fr)
JP (1) JPH06500274A (fr)
DE (2) DE4025483C2 (fr)
WO (1) WO1992002370A1 (fr)

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JP2880627B2 (ja) * 1993-06-25 1999-04-12 東芝テック株式会社 印字ギャップ調整装置
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US6578276B2 (en) * 1998-01-27 2003-06-17 Eastman Kodak Company Apparatus and method for marking multiple colors on a contoured surface having a complex topography
DE19813899A1 (de) * 1998-03-28 1999-09-30 Psi Printer Systems Internatio Drucker, insbesondere Matrix-Nadeldrucker
US6428135B1 (en) 2000-10-05 2002-08-06 Eastman Kodak Company Electrical waveform for satellite suppression
US6561607B1 (en) 2000-10-05 2003-05-13 Eastman Kodak Company Apparatus and method for maintaining a substantially constant closely spaced working distance between an inkjet printhead and a printing receiver
US6450602B1 (en) 2000-10-05 2002-09-17 Eastman Kodak Company Electrical drive waveform for close drop formation
US20030110644A1 (en) * 2001-12-18 2003-06-19 Miller Michael D. Universal fork
KR100636135B1 (ko) * 2003-12-31 2006-10-19 삼성전자주식회사 양면인쇄장치의 화상정렬 인쇄방법
JP6291854B2 (ja) * 2014-01-17 2018-03-14 セイコーエプソン株式会社 プリンターおよびその制御方法
EP3723992B1 (fr) * 2018-01-18 2024-03-06 Hewlett-Packard Development Company, L.P. Chariot d'imprimante avec capteur
KR20220142515A (ko) * 2020-04-23 2022-10-21 휴렛-팩커드 디벨롭먼트 컴퍼니, 엘.피. 인쇄 매체와 프린트헤드 사이의 거리 조정
CN115157871B (zh) * 2022-08-12 2023-11-21 厦门汉印电子技术有限公司 打印头和打印衬底之间距离确定方法、打印设备和存储介质

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DE2608301C2 (de) * 1976-02-28 1986-02-20 Ncr Corp., Dayton, Ohio Vorrichtung zur Regelung des Abstandes eines Druckkopfes von einem Aufzeichnungsträger
US4676675A (en) * 1984-05-09 1987-06-30 Brother Kogyo Kabushiki Kaisha Media thickness compensating device for a printer
JPS62212180A (ja) * 1986-03-14 1987-09-18 Nec Corp プリンタ
EP0240460A3 (fr) * 1986-04-02 1987-12-16 Ciba-Geigy Ag Mélange d'éthers glycidyliques polyfonctionnels durcissables à température ambiante
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JPH0259378A (ja) * 1988-08-24 1990-02-28 Brother Ind Ltd プリンタ
DE3830880A1 (de) * 1988-09-08 1990-03-15 Mannesmann Ag Drucker, insbesondere matrixnadeldrucker, mit einer druckkopfabstandseinstelleinrichtung

Also Published As

Publication number Publication date
DE4025483A1 (de) 1992-02-13
EP0542811A1 (fr) 1993-05-26
DE4025483C2 (de) 1995-03-16
US5360276A (en) 1994-11-01
DE59101459D1 (de) 1994-05-26
WO1992002370A1 (fr) 1992-02-20
JPH06500274A (ja) 1994-01-13

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