EP0269976A2 - Dispositif de support pour tête d'impression à matrice - Google Patents

Dispositif de support pour tête d'impression à matrice Download PDF

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Publication number
EP0269976A2
EP0269976A2 EP19870117308 EP87117308A EP0269976A2 EP 0269976 A2 EP0269976 A2 EP 0269976A2 EP 19870117308 EP19870117308 EP 19870117308 EP 87117308 A EP87117308 A EP 87117308A EP 0269976 A2 EP0269976 A2 EP 0269976A2
Authority
EP
European Patent Office
Prior art keywords
rocker
support
print head
sensor
axes
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
EP19870117308
Other languages
German (de)
English (en)
Other versions
EP0269976A3 (en
EP0269976B1 (fr
Inventor
Hermann Kohlhage
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
Siemens Nixdorf Informationssysteme 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 Siemens Nixdorf Informationssysteme AG filed Critical Siemens Nixdorf Informationssysteme AG
Priority to AT87117308T priority Critical patent/ATE72415T1/de
Publication of EP0269976A2 publication Critical patent/EP0269976A2/fr
Publication of EP0269976A3 publication Critical patent/EP0269976A3/de
Application granted granted Critical
Publication of EP0269976B1 publication Critical patent/EP0269976B1/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 device for holding a matrix print head with a carrier, on which the print head and a rocker bearing a sensor for scanning the thickness of a record carrier are pivotally mounted about axes parallel to one another and for support for the record carrier, the print head depending on the distance of the sensor is adjustable relative to the support.
  • DE-OS 23 21 988 shows a device for holding a needle printhead, in which the distance of the printhead mouthpiece from the recording medium is set by means of a sliding element.
  • the sliding element sits close to the printhead, so that the change in distance which the sliding element experiences is transmitted to the printhead in a short way.
  • the print head and the sliding element are arranged on the carrier via leaf springs, so that they perform a quasi-linear movement perpendicular to the recording plane with small deflections. This arrangement can only be used for recording media which have a completely constant strength. If, on the other hand, the recording medium has differences in thickness over a relatively short distance, then those of the relatively large-area slider cannot be detected. This is the case, for example, with a passbook when the print head approaches the center fold of the passbook.
  • the print head can be adjusted in a linear guide perpendicular to the surface of the record carrier.
  • the printhead is directly connected to a sensing roller so that it can follow the movements of the sensing roller immediately.
  • sliding guides which enable the required precise and smooth movement of the print head in a reliable manner, are quite complex.
  • the invention has for its object to provide a device of the type mentioned, which ensures in a simple and reliable manner the maintenance of a constant distance between the print head mouthpiece and the surface of a recording medium regardless of the thickness thereof.
  • the object is achieved in that the print head is attached to a second rocker, which is directed essentially parallel to the first rocker and is supported by a support on the first rocker and that the distances measured perpendicular to the rocker axes 1 1, 1 2, 13 and 14 of the support of the sensor, of the axis of the first rocker, of the print head mouthpiece and of the axis of the second rocker are chosen so that the relationship is at least approximately fulfilled, with 13 greater than 11 and 14 greater than 12.
  • a certain distance between the needle tips of the print head and the probe is required, which in practice can be about 10 mm.
  • a rocker carrying the printhead cannot be chosen to be much longer than approx. 100 mm for spatial design reasons. If the sensor and the printhead were arranged on the same rocker arm, this would, according to the lever laws of mechanics, lead to the printhead being raised by approx the feeler. With a passbook of approx. 3 mm thickness, this would result in the printhead being raised 0.3 mm higher than the support compared to the sensor. This additional amount can no longer be bridged by the printing needles without the typeface suffering as a result.
  • the sensor is expediently formed in a manner known per se from a roller, the axis of which lies in a plane running through the print needle guides of the print head mouthpiece and perpendicular to the support for the recording medium.
  • the line of contact of the sensor with the surface of the recording medium also lies in the plane running through the printing needle guides and perpendicular to the support, so that the sensor actually detects the thickness of the recording medium at the point at which the printing needles are to hit the recording medium.
  • the rocker axes preferably lie at least approximately in the same plane parallel to the support.
  • the second rocker is biased in the direction of the support, so that the sensor rests on the recording medium with a certain contact pressure.
  • the rockers can be pivoted together about their axes by means of an adjusting device. Certain stops, of which at least one can be adjustable, can be provided on the first rocker and the support for bearing against one another, in order to establish a defined zero position of the rockers.
  • the generally designated 10 holder for a needle printhead 12 (Fig. 2), of which only the mouthpiece 14 is shown in Fig. 1, comprises a carriage 16 which is slidably mounted on a slide rail 18 in the longitudinal direction of the slide rail.
  • the carriage 16 has two arms 20 on which a first rocker arm 26 and a second rocker arm 28 are pivotally mounted about axes 22, 24 which are parallel to one another.
  • the rocker axles 22 and 24 lie in a plane parallel to a support surface 30 for a record carrier 32 (in the present case, for example, a savings book).
  • the rocker 26 is in the form of a frame or bracket and serves to hold a tracking roller 34, which is intended as a sensor for scanning the thickness of the recording medium 32.
  • the rocker 28 is also frame-shaped and extends essentially parallel to the rocker 26.
  • the needle print head 12 is fastened to the rocker 28.
  • the rocker 28 - viewed perpendicular to the rocker axes 22, 24 - is longer than the rocker 26 so that it engages over it.
  • the guide roller 34 and the needle print head 12 are arranged on the two rockers 26 and 28 such that the axis 36 of the guide roller 34 lies in the plane running through the needle guides 40 of the print head mouthpiece 14.
  • the rocker 28 rests on a support 38 connected to the rocker 26, which has a semi-cylindrical surface, so that the contact between the support 38 and the rocker 28 is only linear.
  • the two rockers 26 and 28 are in the illustrated embodiment Helical compression springs 42 are biased towards the support 30 so that they rest on the support 30 or the recording medium 32 with a defined pressure.
  • this preload can also be achieved in that the mounting of the rocker 28 is not designed as a rod-shaped shaft, but as a leaf spring in the length of the rocker axis 24. In this embodiment, the leaf spring then exerts the pressure on the first rocker 26 and thus the tracking roller 34.
  • the two rockers 26 and 28 can be pivoted together by means of an actuating device (not shown) in order to enable or facilitate the insertion of a record carrier into the printing device.
  • a stop 44 comes to rest on a counter-stop 48 provided with an adjusting screw 46, which is connected to the first rocker 26.
  • the tracking roller 34 is raised by the amount A.
  • the support 38 is only raised by a fraction of the dimension A. Selecting the distances 11 to 14 of the bearing 38 in FIG. 2 from the tracking roller 34, from the first rocker axis 22, from the print head mouthpiece 14 and from the second rocker axis 24 in such a way that the relationship is at least approximately fulfilled, this has the consequence that when the guide roller 34 is raised by the amount A, the pressure Kopfmund Huawei 14 is also raised only by the amount A and not by a higher amount. The intended distance B of the print head mouthpiece 14 from the surface of the recording medium is thus always maintained, regardless of its thickness.

Landscapes

  • Common Mechanisms (AREA)
  • Facsimile Heads (AREA)
  • Length Measuring Devices With Unspecified Measuring Means (AREA)
EP87117308A 1986-12-01 1987-11-24 Dispositif de support pour tête d'impression à matrice Expired - Lifetime EP0269976B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87117308T ATE72415T1 (de) 1986-12-01 1987-11-24 Vorrichtung zur halterung eines matrixdruckkopfes.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3641044A DE3641044C1 (de) 1986-12-01 1986-12-01 Vorrichtung zur Halterung eines Matrixdruckkopfes
DE3641044 1986-12-01

Publications (3)

Publication Number Publication Date
EP0269976A2 true EP0269976A2 (fr) 1988-06-08
EP0269976A3 EP0269976A3 (en) 1989-09-06
EP0269976B1 EP0269976B1 (fr) 1992-02-05

Family

ID=6315222

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87117308A Expired - Lifetime EP0269976B1 (fr) 1986-12-01 1987-11-24 Dispositif de support pour tête d'impression à matrice

Country Status (4)

Country Link
EP (1) EP0269976B1 (fr)
AT (1) ATE72415T1 (fr)
DE (2) DE3641044C1 (fr)
ES (1) ES2029257T3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103753973A (zh) * 2014-02-13 2014-04-30 云南南天电子信息产业股份有限公司 打印头定距调整装置

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4041985A1 (de) * 1990-12-21 1992-07-02 Mannesmann Ag Drucker, insbesondere matrixdrucker

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2900061A (en) * 1957-02-12 1959-08-18 Palmer George Vincent Ambulatory typewriter
FR2185160A5 (fr) * 1972-05-18 1973-12-28 Burroughs Corp
DE2409060A1 (de) * 1974-02-25 1975-08-28 Siemens Ag Flachdrucker zum bedrucken von formularen
SE389061B (sv) * 1975-03-06 1976-10-25 Philips Svenska Ab Tryckhuvud med distansorgan for instellning av tryckavstand
DE2608301C2 (de) * 1976-02-28 1986-02-20 Ncr Corp., Dayton, Ohio Vorrichtung zur Regelung des Abstandes eines Druckkopfes von einem Aufzeichnungsträger
DE2651884C3 (de) * 1976-11-13 1981-05-14 Philips Patentverwaltung Gmbh, 2000 Hamburg Vorrichtung zur elektromechanischen Abstandsregelung eines Druckkopfes vom Druckwiderlager
DE3112079C2 (de) * 1981-03-27 1983-02-03 Triumph-Adler Aktiengesellschaft für Büro- und Informationstechnik, 8500 Nürnberg Vorrichtung zum Abheben des Druckkopfes von der Druckgegenlage
DE3417381A1 (de) * 1984-05-10 1985-11-14 CAB-Produkttechnik Gesellschaft für Computer- und Automations-Bausteine mbH, 7500 Karlsruhe Vorrichtung zur automatischen papierdickenanpassung eines druckerkopfes

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103753973A (zh) * 2014-02-13 2014-04-30 云南南天电子信息产业股份有限公司 打印头定距调整装置

Also Published As

Publication number Publication date
ES2029257T3 (es) 1992-08-01
DE3641044C1 (de) 1988-05-11
ATE72415T1 (de) 1992-02-15
DE3776629D1 (de) 1992-03-19
EP0269976A3 (en) 1989-09-06
EP0269976B1 (fr) 1992-02-05

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