EP0049907B1 - Imprimante, notamment imprimante thermo-électrique - Google Patents

Imprimante, notamment imprimante thermo-électrique Download PDF

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Publication number
EP0049907B1
EP0049907B1 EP81108336A EP81108336A EP0049907B1 EP 0049907 B1 EP0049907 B1 EP 0049907B1 EP 81108336 A EP81108336 A EP 81108336A EP 81108336 A EP81108336 A EP 81108336A EP 0049907 B1 EP0049907 B1 EP 0049907B1
Authority
EP
European Patent Office
Prior art keywords
roll
printing head
fact
axis
printer
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
EP81108336A
Other languages
German (de)
English (en)
Other versions
EP0049907A3 (en
EP0049907A2 (fr
Inventor
Günther Obstfelder
Gerhard Kreutze
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.)
F&O Electronic Systems GmbH and Co
Original Assignee
F&O Electronic Systems GmbH and Co
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 F&O Electronic Systems GmbH and Co filed Critical F&O Electronic Systems GmbH and Co
Priority to AT81108336T priority Critical patent/ATE11890T1/de
Publication of EP0049907A2 publication Critical patent/EP0049907A2/fr
Publication of EP0049907A3 publication Critical patent/EP0049907A3/de
Application granted granted Critical
Publication of EP0049907B1 publication Critical patent/EP0049907B1/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
    • B41J25/304—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 printer, in particular a thermoelectric printer, with electrically controllable pressure points, consisting of a motor-driven roller rotatably mounted in a housing and a print head which rests on the roller in a spring-loaded manner and whose print line is arranged in the longitudinal direction of the roller.
  • thermoelectric printers with print points which can be controlled electrically in parallel, are subject to tolerances which have the effect that the print head does not lie completely tangentially on the roller.
  • different roller prints are created, which lead to different print quality of the printed information.
  • Attempts have been made to compensate for this disadvantage by printing the printhead onto the roller under high contact pressure.
  • the roller wears out quickly; in particular, deviations in the contact pressure lead to the printhead being worn differently and quickly, which therefore has only a short service life.
  • the printed image becomes different and deteriorates.
  • a printer has become known from US Pat. No. 4,189,244, the print head of which can be displaced longitudinally to an elongate plate which serves as an abutment.
  • the printhead runs on a rod, which has an adjusting device at each end. so that a change in the position of the rod together with the print head relative to the abutment is possible.
  • an adjustable platen for mosaic printing devices in which a roller is held in two housing side walls by means of setting plates, these setting plates being adjustable in the XY plane by means of eccentric foam. This allows the platen, in this case the platen, to be adjusted relative to the printhead.
  • the invention is therefore based on the object of providing a printer of the type mentioned at the outset in which tolerances of the contact pressure on the roller can be compensated for and a completely uniform print image is to be produced as a result.
  • the printer according to the invention has the salient advantage that manufacturing or assembly tolerances of the print head or the print head carrier with respect to the roller can be compensated.
  • the printhead or the printhead carrier is arranged such that its distance from the roller and the angle of the longitudinal axis of the printhead from the longitudinal axis of the roller can be changed.
  • the printhead or the printhead carrier can thus advantageously be arranged displaceably up and down; furthermore, the print head or the print head carrier can be arranged such that it can be tilted about its longitudinal axis with respect to the roller.
  • the print line of the print head lies exactly tangentially on the roller after adjustment, with the print head now resting on the roller with the same pressure everywhere as a further advantage.
  • the printhead can thus be adjusted in such a way that all print dots on a print line print evenly and a uniform print image appears. In this way, a high pressure of the print head against the roller can be avoided. This in turn significantly increases the life of the printhead. Furthermore, the unevenness of the roller can be compensated for by changing the position of the print head.
  • the invention thus provides for the first time a printer whose print head can be adjusted in such a way that the possible mean smallest error can be set in order to obtain an optimal, uniform print image. At the same time, due to the resulting lowest contact pressure, this leads to a long service life for the printhead and the roller.
  • the adjustment process is to be explained in such a way that not all points of a print line of the print head lie on the roller before the adjustment. After the adjustment, all points of a print line lie evenly tangentially on the roller with the same pressure.
  • the adjusting device can consist of an axis running parallel to the longitudinal axis of the print head carrier, which axis is in fixed connection with the latter and the ends of which are slidably supported in the housing walls of the housing.
  • the ends of the axis can each be held in a bore of a guide plate, which are slidably mounted on the housing walls. Due to this axis, which is in a fixed connection with the print head carrier, the position of the print head carrier and thus of the print head can be easily changed to compensate for tolerances.
  • the guide plate can have a hole, preferably a slot hole, which is partially aligned with a bore within the housing wall, the diameter of the bore being greater than the diameter of the hole or greater than the slot width of the slot hole.
  • the guide plate can have two further slotted holes or elongated holes, through which screws extend, which are screwed into threaded bores within a clamping plate lying on the guide plate for holding the guide plate on the housing wall.
  • the power supply to the printhead can be flexible strands. This ensures that the print head is easily displaceable without any force moments being transmitted from live cables to the print head.
  • FIGS. 1 to 7 The example of the printer according to the invention shown in FIGS. 1 to 7 consists according to FIG. Of two housing walls 1, 2, which are arranged plane-parallel and between which a rear wall 3 is mounted. Between the housing walls 1, 2, a rigid axle 4 is mounted in the front area thereof by means of screws 5, 6, which keeps the housing walls 1, 2 at a distance. The housing walls 1, 2, the rear wall 3, and the rigid axis 4 thus form a solid and rigid housing.
  • a roller 43 (FIG. 4) is arranged between the housing walls 1, 2, the shaft 28 of which can be driven via a motor 7 and a gear train 8. The motor 7 can be switched via a microswitch 9.
  • a printhead carrier 10 with a printhead 44 (FIG. 6) is mounted above the roller 43, the printhead carrier 10 being relatively movable with respect to the roller 43.
  • the distance of the print head 44 from the roller and the angle of the longitudinal axis of the print head 44 relative to the longitudinal axis of the roller 43 can be changed.
  • the distance can be changed in such a way that the print head is more or less lifted off the roller on one side and thus no longer runs completely plane-parallel to the roller.
  • the longitudinal axis of the print head which normally runs parallel to the longitudinal axis of the roller, is rotated by a small angle by changing the position of the axis, so that the distances of the individual printing points from the roller also change. It is therefore possible to tilt or swivel the print head carrier together with the print head.
  • the print head carrier 10 consists of an elongated part 42, to which a head part 52 is integrally formed.
  • the actual print head 44 is arranged below this head part 52.
  • the head part 52 has a continuous longitudinal groove 45 which runs parallel to the longitudinal direction of the elongated part 42.
  • a pressing and guiding part 46 which is screwed onto the elongated part 42 by means of screws 48.
  • This pressing and guiding part serves mainly for supplying and holding the current leads 47 to the printhead 44 in the region of the roller 43. For this reason, the side of the pressing and guiding part 46 facing the printhead 44 is round. The pressing and guiding part 46 thus clamps the current leads or strands 47 which lead from the pressing and guiding part 46 to a circuit board 25 which is mounted on the rear wall 3 (FIG. 1).
  • the elongated part 42 has on its front longitudinal edge two hold-downs 12, 13 which serve as a counter-holder for springs 19, 20 on the axis 14. A total of four springs 19, 20, 21 22 are slid onto this axis 14, which are preferably spiral springs.
  • One end of the two middle springs 19, 20 is supported against the hold-down devices 12, 13, the other end of the middle springs 19, 20 is supported against the axis 4.
  • a further shaft 28 (FIG. 1) is freely arranged, the ends of which are arranged in elongated holes 41 (FIG. 4) and on which in the region of the side walls 1, 2 hold-down rollers 29, 30 for holding down the Paper are arranged in the area of its edge.
  • the elongated holes 41 are arranged vertically in the direction above the roller 43, so that the shaft 28 can be moved upwards away from the roller 43.
  • the two remaining spiral springs 21, 22 on the axis 14, which are arranged in the region of the ends of the axis 14, serve to press the shaft 28 onto the roller 43.
  • the one ends of the spiral springs 21, 22 are supported on the fixed one Axis 4, the other ends of the coil springs 21, 22 rest on the shaft 28 with the direction of action radially Roller 43.
  • the spiral springs 19, 20, 21, - 22 on the one hand pivot the print head around the shaft 14 in the direction of the roller 43 and press it onto it, on the other hand, the freely movable shaft 28 together with its hold-down rollers 29, 30 pressed onto the roller 43 and the paper 11.
  • the adjustment mechanism used in this example consists of a guide plate 27 which has a slot hole 35, an elongated hole 37 and a further slot hole 36 along a longitudinal edge in its upper region.
  • the slotted hole 35 has a greater width than the width of the slotted hole 36 or the elongated hole 37.
  • the guide plate 27 has a bore 38 which is approximately below the elongated hole 37 is arranged.
  • the two guide plates are arranged on both sides of the housing walls 1 and 2 on the inside, the slot hole 35 partially encompassing the axis 4.
  • the slot hole 39 (FIG. 3) is aligned with a bore 40 inside the housing walls 1, 2 , wherein the bore 40 has a larger diameter than the width of the slot hole 39 carries.
  • the printhead is now checked and adjusted as follows after paper has been loaded into the printer.
  • the axis 14 is carried along, which in turn is in a fixed connection with the print head carrier 10, as a result of which a change in the position of the print head with respect to the roller 43 takes place.
  • the position of the printhead in relation to the roller 43 can be changed, as a result of which tolerances and the resulting pressure differences in the printed image can be corrected and compensated for.
  • all errors are minimized to a medium error, which means that the print line of the print head is at the same pressure everywhere along its length.
  • the print line produces an optimal print image, which in turn leads to the longest possible service life of the print head due to the minimized contact pressure.

Landscapes

  • Common Mechanisms (AREA)
  • Electronic Switches (AREA)

Claims (8)

1. Imprimante, notamment une imprimante thermo-électrique avec des points de poussée parallèlement programmables par électricité se composant d'un cylindre d'impression pivotant actionné par moteur qui est logé dans une boîte, et d'une tête d'impression placée au sens longitudinal du cylindre d'impression qui, sous l'action d'un ressort, est couchée sur le cylindre d'impression. La tête d'impression (22) a un dispositif d'ajustage qui permet de changer l'angle de l'axe longitudinal de la tête d'impression vis-à-vis de l'axe longitudinal du cylindre d'impression de façon qu'après l'ajustage, la ligne d'impression de la tête d'impression soit couchée sur le cylindre d'impression de manière tangentielle exacte et avec la même pression de chaque point de poussée.
2. Imprimante conformément à la revendication 1, marquée du fait que le dispositif d'ajustage permet, d'une part, la modification de l'angle de l'axe longitudinal de la tête d'impression vis-à-vis de l'axe longitudinal du cylindre d'impression et, d'autre part, il permet de modifier en même temps la position de la tête d'impression par rapport à l'espace entre tête d'impression et cylindre d'impression.
3. Imprimante conformément à la revendication 1 ou 2, marquée du fait que la tête d'impression (42, 44) est montée sur un support (43) muni d'un dispositif d'ajustage.
4. Imprimante conformément à la revendication 3, marquée du fait que le dispositif d'ajustage se compose d'un axe (14) guidé parallèlement à l'axe longitudinal du support (43), relié solidement avec ce support et dont les fusées d'essieu sont fixés de manière mobile aux parois de la boîte (1, 2).
5. Imprimante conformément à la revendication 4, marquée du fait que les fusées d'essieu (14) sont fixés à un forage (38) de chacune des lamettes de guidage (27), qui sont montées de manière mobile aux parois de la boîte (1, 2).
6. Imprimante conformément à la revendication 5, marquée du fait que la lamette de guidage (27) est pourvue d'un trou, de préférence d'un trou en fente, lequel s'aligne à un forage (40) à l'intérieur de la paroi de la boîte (1, 2), étant donné que le diamètre du forage est plus grand que celui du trou ou de la largeur de fente du trou en fente.
7. Imprimante conformément à la revendication 6, marquée du fait que la lamette de guidage (27) est munie de deux trous en fente supplémentaires (36) ou de trous oblongs (37) traversés par des vis (24) qui sont vissés aux forages taraudés à l'intérieur d'une lamette de serrage couchée sur la lamette de guidage garantissant la fixation du dispositif de serrage de la lamette de guidage aux parois de la boîte (1, 2).
8. Imprimante conformément à une des revendications précédentes, marquée du fait que la tête d'impression est alimentée par une amenée du courant sous forme de cordons souples.
EP81108336A 1980-10-15 1981-10-15 Imprimante, notamment imprimante thermo-électrique Expired EP0049907B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81108336T ATE11890T1 (de) 1980-10-15 1981-10-15 Drucker, insbesondere thermoelektrischer drucker.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3038867 1980-10-15
DE3038867A DE3038867C2 (de) 1980-10-15 1980-10-15 Ausdruck- und Justiervorrichtung für den Druckkopf eines Thermodruckers

Publications (3)

Publication Number Publication Date
EP0049907A2 EP0049907A2 (fr) 1982-04-21
EP0049907A3 EP0049907A3 (en) 1983-06-01
EP0049907B1 true EP0049907B1 (fr) 1985-02-20

Family

ID=6114392

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81108336A Expired EP0049907B1 (fr) 1980-10-15 1981-10-15 Imprimante, notamment imprimante thermo-électrique

Country Status (3)

Country Link
EP (1) EP0049907B1 (fr)
AT (1) ATE11890T1 (fr)
DE (2) DE3038867C2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010079135A2 (fr) 2009-01-09 2010-07-15 Energetica Holding Gmbh Module solaire dans une structure sandwich en verre isolant, procédé de fabrication et utilisation

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU574668B2 (en) * 1983-04-12 1988-07-14 Monarch Marking Systems Inc. Labeler
US4957379A (en) * 1989-01-11 1990-09-18 Monarch Marking Systems, Inc. Printing apparatus
DE3909254A1 (de) * 1989-03-21 1990-09-27 Esselte Meto Int Gmbh Thermodruckkopf
JP3365559B2 (ja) * 1990-08-10 2003-01-14 株式会社サトー サーマルプリンタにおけるヘッド支持機構
DE4332626A1 (de) * 1993-09-24 1995-03-30 Esselte Meto Int Gmbh Verfahren und Vorrichtung zur Montage eines Thermodruckmoduls

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE6916735U (de) * 1969-04-24 1969-09-04 Triumph Werke Nuernberg Ag Vorrichtung zum einstellen des papierwagens an schreib- oder aehnlichen maschinen
DD111850A1 (fr) * 1974-03-11 1975-03-12
JPS5420744A (en) * 1977-07-15 1979-02-16 Toshiba Corp Heat sensitive recorder
US4189244A (en) * 1977-11-21 1980-02-19 Data Products Corporation Platen gap adjuster

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010079135A2 (fr) 2009-01-09 2010-07-15 Energetica Holding Gmbh Module solaire dans une structure sandwich en verre isolant, procédé de fabrication et utilisation

Also Published As

Publication number Publication date
ATE11890T1 (de) 1985-03-15
DE3038867C2 (de) 1983-12-01
EP0049907A3 (en) 1983-06-01
EP0049907A2 (fr) 1982-04-21
DE3169079D1 (en) 1985-03-28
DE3038867A1 (de) 1982-05-06

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