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EP0040879B1 - Imprimante par points avec ajustement automatique de la tête d'impression - Google Patents

Imprimante par points avec ajustement automatique de la tête d'impression Download PDF

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Publication number
EP0040879B1
EP0040879B1 EP81200532A EP81200532A EP0040879B1 EP 0040879 B1 EP0040879 B1 EP 0040879B1 EP 81200532 A EP81200532 A EP 81200532A EP 81200532 A EP81200532 A EP 81200532A EP 0040879 B1 EP0040879 B1 EP 0040879B1
Authority
EP
European Patent Office
Prior art keywords
printing
carriage
chamber
friction plate
printing 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
Application number
EP81200532A
Other languages
German (de)
English (en)
Other versions
EP0040879A2 (fr
EP0040879A3 (en
Inventor
Lothar Haubrich
Heinrich Dürr
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.)
Philips Intellectual Property and Standards GmbH
Koninklijke Philips NV
Original Assignee
Philips Patentverwaltung GmbH
Philips Gloeilampenfabrieken NV
Koninklijke Philips Electronics NV
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 Philips Patentverwaltung GmbH, Philips Gloeilampenfabrieken NV, Koninklijke Philips Electronics NV filed Critical Philips Patentverwaltung GmbH
Publication of EP0040879A2 publication Critical patent/EP0040879A2/fr
Publication of EP0040879A3 publication Critical patent/EP0040879A3/de
Application granted granted Critical
Publication of EP0040879B1 publication Critical patent/EP0040879B1/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
    • B41J25/00—Actions or mechanisms not otherwise provided for
    • B41J25/001—Mechanisms for bodily moving print heads or carriages parallel to the paper surface

Definitions

  • the invention relates to a matrix printer with a combination of a carriage and a print head located thereon which can be moved back and forth along a paper guide and which has a first printing position for printing drawing elements when moving from left to right and a second printing position for printing drawing elements when moving right to left, wherein the drawing elements of a certain print element in the print head, which are printed on the paper when the print head moves to the right, with respect to the drawing elements of this same print element which are printed on the paper when the print head moves to the left, in are shifted vertically over a distance that is part of the vertical distance between two successive print elements in the print head.
  • the height of the print head in relation to the paper guide is set by energizing an electromagnet, the armature of which is connected via a lever to an eccentric which is connected to a part of the longitudinal guide of the car works together.
  • the printhead is adjusted in height by rotating the printhead around an axis parallel to the line direction. Since the height of the print head can be set optionally, there is a choice between characters whose composite elements (dot imprints) are relatively far apart and characters whose composite elements are relatively close to one another or even overlap.
  • the invention has for its object to provide a matrix printer of the type mentioned, with which characters can be printed completely automatically in a simple manner, the composite elements of which are relatively close to one another, for which purpose a relatively small number of printing elements is also used.
  • the reversal of movement of the print head can also be used in order to achieve a relative displacement of the position change element.
  • the distance in which the height adjustment takes place can lie either before or after the reversal point or on both sides of the reversal point (in terms of time). It is particularly simple and advantageous to essentially or largely use the reversal of movement itself for the height adjustment without having to use certain inertial forces on the position changing member. In this case, the change in the movement impulse is given by the change in direction of the speed vector.
  • the position change element forms the coupling between a friction plate which can be displaced via a guide wall delimiting the chamber and the print head.
  • a separate friction plate as a coupling offers the advantage that different forms of the position change members can be used with constant friction conditions between the friction plate and the guide wall, because the friction element is, as it were, normalized. It is also possible to obtain a precisely determined coefficient of friction for a relatively long time through the choice of material for the friction plate.
  • the friction plate can also be used to determine the magnitude of the relative movement that the position changing member performs with respect to the print head.
  • a further special embodiment of a matrix printer according to the invention is characterized in that the chamber is located in the carriage and the guide wall delimiting the chamber is part of a fixedly arranged guide profile extending parallel to the line direction and the print head with the carriage with respect to the guide profile from the first and second pressure state and vice versa is rotatable about an axis of rotation which is perpendicular to the line direction. Since the carriage can be rotated with the print head, the existing guide profile of the carriage can be used for guiding the rotary movement.
  • the matrix printer shown in FIGS. 1, 2 and 3 contains a printhead 3, mounted on a carriage 1, of a type known per se with six electromagnetically displaceable printing pens, the printing ends 5 of which for writing lie on a vertical line.
  • the pressure pins are guided in a bearing 7 near their printing ends 5.
  • the print head 3 is attached to the carriage 1 with the aid of a wire bracket 9 known per se.
  • the carriage 1 can be moved along a paper guide 13 via a fixedly arranged guide profile 15 which extends parallel to the line direction and which.
  • the guide professional) 15 is U-shaped in cross section (see FIG. 2) and serves as a guide for the carriage 1, which consists of two snap-in parts, i. H. a front part 17 and a rear part 19.
  • the snap connections are located at the reference numbers 21 and 23 (FIGS. 1 and 2). Further similar snap connections between parts 17 and 19 of the carriage 1 are not given for the sake of simplicity.
  • the carriage 1 is guided along the guide profile 15 by means of a number of sliding plates 25, 27, 29, 31, 33, 35, 37, 38 and a friction plate 39.
  • the friction plates 25, ..., 38 have different considerations with respect to the friction plate 39.
  • Both the sliding plates 25, ..., 38 and the friction plate 39 are located in chambers of the carriage 1.
  • the chambers of the sliding plates 25,... 37 are not designated with reference numerals.
  • the friction plate 39 is located in a particularly marked chamber 41, which is explained in more detail below. All sliding plates 25, ..., 38 are arranged with some play in the relevant chambers in order to allow a slight relative movement between the plates and the carriage 1.
  • the sliding plates 25, 29, 31, 33, 35 and 37 can also be tilted by hemispherical cams 43, 45, 47, 48, 49 and 51, respectively, which are formed in the walls of the relevant chambers.
  • the slide plate 27 is held against the guide profile 15 with a helical spring 53 (FIG. 2). This prevents static over-determination in a direction perpendicular to the row direction.
  • the slide plate 38 is also held pressed against the guide profile 15 with a helical spring 55.
  • the sliding plates 25, ..., 38 and the friction plate 39 ensure the guidance of the carriage 1 on the guide profile 15.
  • the carriage 1 is dimensioned such that there is clearance around the guide profile 15 between the carriage and the guide profile.
  • the carriage 1 is rotatable about a horizontal axis 57 (see FIG. 3) perpendicular to the line direction.
  • This axis of rotation 57 runs through the point of contact of the cam 48 with the slide plate 35 and thus perpendicular to the plane of the paper in FIG. 1.
  • the print head 3 can therefore also be rotated about the axis of rotation 57.
  • the rotation of the combination of the carriage 1 and the print head 3 is carried out by a position changing member which, in the embodiment shown in FIGS. 1, 2, 3 and 4, is designed as a circular cylindrical roller 59 which can roll and / or slide over the friction plate 39 that can slide over the guide profile 15 itself.
  • the roller 59 like the friction plate 39, is located in the chamber 41, the upper side 60 of the guide profile 15 forming a boundary.
  • the chamber 41 there is also a plate 63 arranged at an angle a with the row direction 61, which can be tilted about a rib 64 in the wall of the chamber 41 (FIG. 2).
  • the roller 59 can roll and / or slide over the surface of the plate 63 facing the friction plate 39.
  • the axis of the roller 59 runs perpendicular to the line direction.
  • the roller 59 bears against a first boundary wall 65 of the chamber 41, while the carriage 1 is moved in the direction of the arrow 67 via the guide profile 15.
  • a first, second boundary wall 69 lies opposite the first boundary wall 65.
  • the friction plate 39 bears against a third boundary wall 71, which lies opposite a fourth boundary wall 73.
  • the carriage 1 Shortly before the carriage 1 reaches the point of reversal from a rightward movement into a leftward movement at the end of a printed line, the carriage 1 is braked strongly for a short time.
  • the masses of the friction plate 39 and the roller 59 and the frictional forces on the friction plate 39 and on the roller 59 and the pressure force,. which the carriage 1 exerts on the roller 59 are such that the roller 59 bears against the second boundary wall 69 before the friction plate 39 bears against the fourth boundary wall 73.
  • the roller 59 and the second boundary wall 69 Since the distance between the roller 59 and the second boundary wall 69 is greater than the distance between the friction plate 39 and the fourth boundary wall 73, this means that the roller 59 must roll and / or slide over the friction plate 39 for some time before one Sliding process between the friction plate 39 and the guide profile 15 occurs. This is due to the selection of a relatively large coefficient of friction between the friction plate 39 and the guide profile 15 with respect to both the coefficient of friction between the roller 59 and the friction plate 39 and the coefficient of friction between the roller 59 and the plate 63 and the first boundary wall 65 and the second boundary wall 69 is reached.
  • the time at which the roller 59 and the friction plate 39 are put on can be either before or after the time of the reversal of movement, depending on the magnitude of the mass inertia forces concerned.
  • the carriage 1 rotates together with the print head 3 over a certain angle about the axis of rotation 57 (see FIGS. 1 and 3).
  • This rotation causes the print head 3 to drop by a distance of 0.09 mm in the present case.
  • the horizontal displacement of the printhead due to the rotation around the axis 57 is negligible, and with it the resulting obliquity of the printed characters, because the distance between the axis 57 and the roller 59 is relatively large.
  • printing is then carried out from right to left between the drawing elements which were already printed in the same line during the movement from left to right. The vertical distance between these drawing elements was 0.18 mm.
  • the printhead 3 can also be equipped with a plurality of printhead columns.
  • printheads with two printhead columns are frequently used.
  • These two printing pin columns can possibly be arranged offset from one another.
  • the vertical distance between the first printing pin from the first column and the first printing pin from the second column is often 0.18 mm, while the vertical distance between two successive printing pins in the same column of printing pins is 0.36 mm.
  • the carriage 1 When the movement is reversed at the end of the carriage movement from right to left, the carriage 1 is raised with the print head 3 by the same distance by which the combination mentioned has decreased during the last movement reversal.
  • the roller 59 moves from the second boundary wall 69 to the first boundary wall 65.
  • the roller 59 abuts the boundary wall 65 before the friction plate 39 bears against the third boundary wall 71.
  • the time of application can be either before or after the time of the reversal of movement depending on the magnitude of the inertial forces on the roller 59 or the friction plate 39.
  • the braking of the car can be carried out over a relatively long time.
  • the change of the boundary wall is effected entirely and directly after the reversal of movement on the left side.
  • the rod 75 consists of a rod 75 with rounded ends 77 and 79.
  • the rod 75 forms the coupling between the carriage 1 and the friction plate 39.
  • the carriage 1 and the friction plate 39 with bearing recesses 81 and 83 equipped.
  • the distance a between the end 85 of the friction plate 39 and the fourth boundary wall 73 of the chamber 41 is so large that after the reversal of movement from the direction of movement of the carriage 1, which is indicated by the arrow 67, the Bearing recess 83, seen in the vertical direction, lies below the bearing recess 81, the rod 75 being in the vertical position.
  • the friction plate 39 thus not only fulfills the function of a sliding element with a precisely determined friction behavior, but also serves as a limiter of the tilt angle ⁇ of the tilting rod 75 or by a combination of the effect of the inertial force exerted on the friction plate 39 and the rod 75 when the carriage 1 is braked and the movement reversal.
  • the boundary wall can even be changed completely before the moment of reversal of movement, if the braking of the carriage 1 is effected in a sufficiently short time.
  • the combination of the carriage 1 and the print head 3 is rotated counterclockwise about such an angle about the axis of rotation 57 that the combination mentioned is again 0.09 mm in more vertical Direction is pushed up.
  • the displacement of the combination in the horizontal direction is negligibly small due to the relatively large distance between the axis of rotation 57 and the bearing recess 81.
  • the tilting angle ⁇ of the rod 75 is possible to have the tilting angle ⁇ of the rod 75 not determined indirectly by the stroke that the friction plate 39 can perform with respect to the carriage 1, but in a direct manner.
  • the first boundary wall 65 and the second boundary wall 69 are provided with mutually opposite lugs, against which the rod 75 can rest.
  • the chamber 41 is completely in the carriage 1, it is possible to use a chamber which is partly in the carriage 1 and partly in the print head 3.
  • the friction plate 39 is in the carriage 1, while the inclined plate 63 is in the print head 3.
  • the height adjustment is carried out by a relative movement of the print head 3 with respect to the carriage 1.
  • the print head 3 can contain printing elements of various types which are suitable for matrix printing.
  • the printing elements consist of electrodes for electrostatic printing or of ink tubes that send ink drops to the data carrier.
  • position change elements can also be used on both sides of the print head.
  • the axis of rotation 57 does not exist. Such an embodiment offers the advantage that the carriage 1 can be made narrower.

Landscapes

  • Character Spaces And Line Spaces In Printers (AREA)
  • Dot-Matrix Printers And Others (AREA)
  • Impact Printers (AREA)
  • Common Mechanisms (AREA)

Claims (5)

1. Imprimante par points comportant un ensemble mobile dans un sens et dans l'autre le long d'un guide pour le papier et formé d'un chariot et d'une tête d'impression se trouvant sur ce chariot, qui présente une première position d'impression pour imprimer des éléments de caractères lors d'un déplacement de la gauche vers la droite et une seconde position d'impression pour imprimer des éléments de caractères lors d'un déplacement de la droite vers la gauche, les éléments de caractères d'un élément d'impression déterminé dans la tête d'impression, qui sont imprimés sur le papier lors du déplacement de la tête d'impression vers la droite, étant décalés par rapport aux éléments de caractères de ce même élément d'impression qui sont imprimés sur le papier lors du déplacement vers la gauche, dans un sens vertical d'une distance qui est égale à une partie de la distance verticale séparant deux éléments d'impression successifs dans la tête d'impression, caractérisée en ce que l'ensemble du chariot et de la tête d'impression est pourvu d'une chambre dans laquelle se trouve un organe de commutation de position qui peut être déplacé par rapport à cet ensemble par une modification de l'impulsion cinétique de la tête d'impression et amène ainsi la tête d'impression par la modification de l'impulsion de la première position d'impression à l'autre.
2. Imprimante par points suivant la revendication 1, caractérisée en ce que l'organe de commutation de position forme l'organe de couplage entre une plaque de friction pouvant coulisser sur une paroi de guidage délimitant la chambre et la tête d'impression.
3. Imprimante par points suivant la revendication 2, caractérisée en ce que l'organe de commutation de position est un cylindre circulaire pouvant rouler sur la plaque de friction et sur une surface qui lui est opposée dans la chambre et qui est disposée obliquement par rapport à la direction des lignes et à la plaque de friction, ce cylindre s'appliquant dans la première position d'impression contre une première paroi de délimitation de la chambre et dans la seconde position d'impression contre une seconde paroi de délimitation de la chambre opposée à la première, de sorte que les deux parois de délimitation et l'axe du cylindre circulaire sont parallèles l'un à l'autre.
4. Imprimante par points suivant la revendication 2, caractérisée en ce que l'organe de commutation de position est une barrette oscillante qui, par sa première extrémité, est positionnée dans le chariot et par son autre extrémité dans la plaque de friction de sorte que l'angle d'inclinaison de la barrette oscillante est déterminé par des saillies pour la plaque de friction se trouvant dans la chambre.
5. Imprimante par points suivant la revendication 1, caractérisée en ce que la chambre se trouve dans le chariot, la paroi de guidage délimitant la chambre fait partie d'un profilé de guidage fixé en place et s'étendant parallèlement à la direction des lignes et la tête d'impression peut pivoter avec le chariot par rapport au profilé de guidage à partir de la première et de la seconde position d'impression et inversement autour d'un axe de pivotement qui s'étend perpendiculairement à la direction des lignes.
EP81200532A 1980-05-22 1981-05-19 Imprimante par points avec ajustement automatique de la tête d'impression Expired EP0040879B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19803019515 DE3019515A1 (de) 1980-05-22 1980-05-22 Drucker zur herstellung eines rasterfoermig aufgebauten zeichens
DE3019515 1980-05-22

Publications (3)

Publication Number Publication Date
EP0040879A2 EP0040879A2 (fr) 1981-12-02
EP0040879A3 EP0040879A3 (en) 1982-02-10
EP0040879B1 true EP0040879B1 (fr) 1984-03-21

Family

ID=6103031

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81200532A Expired EP0040879B1 (fr) 1980-05-22 1981-05-19 Imprimante par points avec ajustement automatique de la tête d'impression

Country Status (10)

Country Link
US (1) US4365901A (fr)
EP (1) EP0040879B1 (fr)
JP (2) JPS5715982A (fr)
AR (1) AR228356A1 (fr)
BR (1) BR8103132A (fr)
CA (1) CA1168108A (fr)
DE (2) DE3019515A1 (fr)
FI (1) FI69597C (fr)
IE (1) IE51521B1 (fr)
YU (1) YU131181A (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3019515A1 (de) * 1980-05-22 1981-11-26 Philips Patentverwaltung Gmbh, 2000 Hamburg Drucker zur herstellung eines rasterfoermig aufgebauten zeichens
JPS58160163U (ja) * 1982-04-19 1983-10-25 東芝テック株式会社 プリンタの印字ヘツドギヤツプ調節装置
JPS599838U (ja) * 1982-07-10 1984-01-21 アルプス電気株式会社 プリンタの紙厚調整装置
JPS5999738U (ja) * 1982-12-24 1984-07-05 マークテック株式会社 印字装置
JP2522231B2 (ja) * 1991-11-15 1996-08-07 株式会社精工舎 印字モ―ドを切換え可能なワイヤドットプリンタ
GB9818026D0 (en) 1998-08-18 1998-10-14 Neopost Ltd Print head transport mechanism
US20030160840A1 (en) * 2001-10-19 2003-08-28 Haseeb Yusef Carriage guide for inkjet printer

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1364646A (en) * 1971-10-07 1974-08-29 Creed Co Ltd Printed telegraph machine
JPS566032B2 (fr) * 1973-07-05 1981-02-09
US4010835A (en) * 1975-08-01 1977-03-08 International Business Machines Corporation Matrix print head
DE2535699C3 (de) * 1975-08-09 1978-12-14 Olympia Werke Ag, 2940 Wilhelmshaven Verfahren und Drucker zur Herstellung von feingerasterten Schriftzeichen auf einem Aufzeichnungsträger
US4086997A (en) * 1977-03-07 1978-05-02 Wang Laboratories, Inc. Adjustable support for print head assembly
DE3019515A1 (de) * 1980-05-22 1981-11-26 Philips Patentverwaltung Gmbh, 2000 Hamburg Drucker zur herstellung eines rasterfoermig aufgebauten zeichens

Also Published As

Publication number Publication date
IE51521B1 (en) 1987-01-07
CA1168108A (fr) 1984-05-29
DE3019515A1 (de) 1981-11-26
DE3162763D1 (en) 1984-04-26
EP0040879A2 (fr) 1981-12-02
JPH0342250A (ja) 1991-02-22
JPH0443786B2 (fr) 1992-07-17
EP0040879A3 (en) 1982-02-10
FI811545L (fi) 1981-11-23
YU131181A (en) 1983-12-31
JPH0258113B2 (fr) 1990-12-06
IE811114L (en) 1981-11-22
FI69597B (fi) 1985-11-29
AR228356A1 (es) 1983-02-28
FI69597C (fi) 1986-03-10
US4365901A (en) 1982-12-28
JPS5715982A (en) 1982-01-27
BR8103132A (pt) 1982-02-09

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