EP0236773A2 - Print head platen distance adjusting device for a printer particularly for a matrix printer - Google Patents

Print head platen distance adjusting device for a printer particularly for a matrix printer Download PDF

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Publication number
EP0236773A2
EP0236773A2 EP87101985A EP87101985A EP0236773A2 EP 0236773 A2 EP0236773 A2 EP 0236773A2 EP 87101985 A EP87101985 A EP 87101985A EP 87101985 A EP87101985 A EP 87101985A EP 0236773 A2 EP0236773 A2 EP 0236773A2
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EP
European Patent Office
Prior art keywords
axis
printer
eccentric
carriage
section
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Granted
Application number
EP87101985A
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German (de)
French (fr)
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EP0236773A3 (en
EP0236773B1 (en
Inventor
Günter Dipl.-Ing. Gomoll (FH)
Wolfgang Dipl.-Ing. Hauslaib (Fh)
Gustav Frank
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Vodafone GmbH
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Mannesmann AG
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Priority to AT87101985T priority Critical patent/ATE68137T1/en
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    • 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
    • B41J25/3088—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 printer frame, e.g. for rotation of an eccentric carriage guide shaft
    • 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 adjusting the distance between the print head and the abutment of a printer, in particular a matrix printer, with a print head arranged on a carriage, with a carriage guide, consisting of a first axis leading the carriage in the longitudinal direction and one leading the carriage only in the vertical direction second axis, the first axis being mounted in the areas of the side walls of the printer by means of eccentric sections of the same eccentricity and carrying an adjusting lever on the outside of the printer.
  • Such eccentric adjustment devices serve the purpose of the operator setting such a distance between the printhead and the recording medium which basically gives the best typeface or, in the case of matrix printers of the needle type, allows the desired number of copies to be produced.
  • this optimal position of the print head is left in any case when the replacement of an ink ribbon or an ink ribbon cassette or the re-introduction of a different type of recording medium or the new beginning of a recording medium is required for continuous webs.
  • signs of wear of the printing needles occur, which make it necessary to readjust the printing needles or to regrind the end faces. In such cases, the printhead must be removed so that the printhead must be readjusted after it is reinstalled.
  • a device that works by means of adjusting eccentrics to adjust the distance between the print head and the writing abutment a printer is known for example from US Pat. No. 4,178,106. Regardless of the fact that the known device is basically only useful for a bar-shaped pressure abutment, the known solution lacks a sufficiently precise determination of the actuating lever for the basic position. In addition, the adjustment to a zero position is extremely imprecise. Furthermore, this eccentric adjustment also involves a less precise guidance in the direction of adjustment.
  • the state of the art is also the subject of DE utility model 71 40 524.
  • This solution provides for a print head that cannot be turned on, on the other hand an adjustable print roller, an adjustment device being provided at each end of the roller.
  • the known object thus essentially contains three movable and coupled assemblies, namely the pivotable holder, a lever element receiving the adjustment movement and a coupling element receiving a fine adjustment movement.
  • the large number of components required for this inevitably entails a tolerance chain, so that the resulting play between the components already leads to the inaccuracy of the adjustment movement. For example, the parallelism of the adjustment movements of the adjustment devices located on both sides of the pressure roller is not guaranteed.
  • the present invention is based on the object of simplifying the subject matter of the type described at the outset compared to the known solutions, i.e. to get by with a smaller number of components and, compared to the known solutions, to ensure a simpler construction with higher accuracy of the positioning movement and above all with higher accuracy of the starting position, i.e. to improve the requirements for the zero position as well as for parallel adjustment and compliance with parallelism.
  • the first axis is provided with a third eccentric section for fixing the adjusting lever, which corresponds to the size of the eccentricity and the position of the eccentricity with the other eccentric sections that the first axis with their Shaft is guided in each case in horizontal recesses of the side walls of the printer frame and that the first and the second eccentric section each resiliently bear against the outer sides of the side walls in adjusting plates on a reference surface.
  • This solution initially means a one-piece axis with three eccentric sections, which can be produced accordingly, and then means an improved parallel guidance and an improved adjustment over the reference surface. The initial adjustment is thus carried out practically optimally by the connection of the actuating lever to the first axis, and the parallel adjustment or the forward and backward movement is adhered to extremely precisely by the formation of the reference surface and by the constant contact with this reference surface.
  • the pressing of the first axis with the corresponding eccentric sections is achieved in that the first and second eccentric sections can each be adjusted against the reference surface by means of spring clips.
  • the assignment of the control lever to the first axis with the three eccentric sections can also advantageously be carried out in that the eccentric sections of the first axis arranged in the setting plates are provided with a circular cross section, whereas the third eccentric section assigned to the control lever is provided with a larger one Radius is provided and that this third eccentric section is adjoined by a collar section which is larger in radius.
  • This design allows the setting lever to be fixed axially in addition to the radial fixing by the corresponding eccentric section without great effort.
  • a horizontal displacement path of the adjusting plates is also created in that the stable plates each have dowel pins or fastening screws guided in horizontal elongated holes.
  • the adjusting lever be in a zero position when the three eccentric sections are rotated by approximately 15 degrees about the longitudinal axis of the first axis guiding the carriage. Since the control lever is only moved from its zero position to the open position, since the zero position takes into account a minimum distance between the print head and the platen, the control lever is moved in a favorable range of the eccentricity position.
  • the actuating lever is opposite an arc-shaped detent segment for a detent attached to the actuating lever.
  • the actuating lever in the region of the curved locking segment is assigned stops in both pivoting directions.
  • the device for adjusting the distance between a print head (1) and a print abutment 2 is located in a matrix printer (3) of the needle type.
  • the pressure abutment can consist of a cylindrical platen (Fig. 2) or a pressure bar (2a) ⁇ Fig. 5> be formed.
  • the print head (1) is arranged on a carriage (4) and firmly connected to it.
  • the carriage (4) is moved back and forth in parallel to and at a constant speed due to a carriage guide (5) and a drive, not shown, in front of the writing abutment (2).
  • the slide guide (5) consists of a slide (4) in the longitudinal direction, ie parallel to Pressure abutment leading first axis (6) and a second axis (7) leading the carriage (4) only in the vertical direction, which releases the carriage (4) in the horizontal plane perpendicular to its direction of back and forth. Horizontal displacement of the first axis (6) therefore leads to a change in the distance between the print head (1) and the print abutment (2).
  • the first axis (6) is mounted in the side walls (3a or 3b) in a guided manner, specifically in horizontal recesses (8), as shown in FIG. 6.
  • the eccentric sections (6a and 6b) of the first axis (6) located next to the side walls (3a and 3b) are according to the size and position of the eccentric, i.e. the eccentricity "e" and the beginning and the course completely the same.
  • Attached to the outside (3c) of the matrix printer (3) is an adjusting lever (9), the zero position (9a) of which, as shown in FIG. 5, is directly related to the position of the eccentricity "e".
  • the setting of the adjusting lever (9) takes place via a third eccentric section (6c) with the eccentricity "e” and its exact position with respect to the other two eccentric sections (6a and 6b).
  • the exact eccentricity "e” and its beginning and end is advantageously achieved by clamping the shaft (6) on its shaft (10) and adjusting the eccentricity around the eccentricity "e", after which conventional turning tools rotate the eccentric sections (6a, 6b, 6c) edit or produce.
  • the adjusting lever (9) is axially or the like by means of spring washers (11). attached and secured.
  • each of the eccentric sections (6a and 6b) is pressed resiliently against a reference surface (19) by means of a spring clip (18).
  • the spring clips (18) are each fixed inside the adjusting plates (13a and 13b).
  • the fastening screws (15) and the dowel pins (14) are each guided in elongated holes (20) so that the system of the eccentric sections (6a, 6b, 6c) can be brought into the position shown (Fig. 5). This determines the position of the reference surface (19).
  • the minimum gap (21) is set, which e.g. is matched to the needle stroke of the print head (1).
  • Such a minimum gap (21) is usually on the order of 0.05 to 0.15 mm.
  • each setting plate (13a, 13b) is set to parallelism, in which the reference surface (19) of each setting plate (13a, 13b) is at the same distance from the pressure abutment (2).
  • the spring clips (18) ensure that the eccentric sections (6a and 6b) rest permanently on the reference surface (19).
  • the adjustment directions are each designated by (22) in FIGS. 5 and 6.
  • the zero position (9a) ⁇ Fig. 5> can also be designed such that the eccentricity "e” is rotated about 15 degrees to the right about the longitudinal axis (23) (axis 6) (not shown) and the adjusting lever (9) is in the position shown ( Fig. 5) is arranged.
  • This position of the adjusting lever (9) shown there is the zero position (9a).
  • the minimum gap (21) is at the specified dimension.
  • the control lever (9) is opposite a curved locking segment (24) with a locking lug (25) attached to the control lever (9).
  • the adjusting lever (9) is therefore in the position pivoted away in the pivoting direction (26), e.g. for changing the ribbon cassette (27) ⁇ Fig. 1> with the locking lug (25) placed in the tooth gaps (28), the distance between the pressure abutment (2a) and the print head (1) being increased accordingly.
  • the path of movement of the adjusting lever (9) is limited by the stops (29 and 30) provided on the detent segment (24).
  • the opening movement of the print head (1) corresponds to a rotational movement direction (31) of the shaft (10) of the axis (6) about the longitudinal axis (23) due to the pivoting direction (26) of the adjusting lever (9) and corresponds to a horizontal movement of the shaft (10) in the direction (32), the eccentric sections (6a and 6b) pivoting in the direction (33) so that the circular cross section (16) moves in the direction (34).
  • the distance (still based on the opening movement) between the longitudinal axis (23) and the reference surface (19) becomes smaller, as a result of which the distance between the print head (1) and the platen (2) increases.
  • the circular cross section (16) is, of course, held against the reference surface (19) by means of the spring clips (18) during the opening movement.

Abstract

Bei einem auf einem Schlitten (4) angeordneten Druckkopf (1) besteht die Schlittenführung aus einer den Schlitten (4) in Längsrichtung führenden ersten Achse (6) und einer den Schlitten (4) nur in Verti­kalrichtung führenden zweiten Achse (7), wobei die erste Achse (6) in den Bereichen der Seitenwände (3a,3b) des Druckers mittels Exzenter-­Abschnitten (6a,6b) gleicher Exzentrizität "e" gelagert ist und an der Außenseite (3d) des Druckers einen Stellhebel (9) trägt.In the case of a print head (1) arranged on a carriage (4), the carriage guide consists of a first axis (6) guiding the carriage (4) in the longitudinal direction and a second axis (7) guiding the carriage (4) only in the vertical direction, the first axis (6) is mounted in the areas of the side walls (3a, 3b) of the printer by means of eccentric sections (6a, 6b) of the same eccentricity "e" and carries an adjusting lever (9) on the outside (3d) of the printer.

Zur Erreichung eines Minimalaufwandes an Bauteilen und zur Festlegung einer Null-Lage der Exzenter-Abschnitte (6a, 6b) sowie zur Verbesserung der Parallelität beim Anstellen wird vorgeschlagen daß zur Festlegung des Stellhebels (9) die erste Achse (6) mit einem dritten Exzenter-­Abschnitt (6c) versehen ist, der bezüglich der Größe der Exzentri­zität (e) und der Lage der Exzentrizität (e) mit den anderen Exzenter-Abschnitten (6a,6b) übereinstimmt, daß die erste Achse (6) mit ihrem Schaft (10) jeweils in horizontalen Ausnehmungen (8) der Seitenwände (3a,3b) des Druckerrahmens (12) geführt ist und daß der erste und der zweite Exzenter-Abschnitt (6a,6b) jeweils an den Außenseiten (3d) der Seitenwände (3a,3b) in Stellplatten (13a,13b) an einer Bezugsfläche (19) federnd geführt anliegen.

Figure imgaf001
In order to achieve a minimum expenditure on components and to determine a zero position of the eccentric sections (6a, 6b) and to improve the parallelism when starting, it is proposed that the first axis (6) be fixed with a third eccentric to fix the actuating lever (9). Section (6c) is provided, which corresponds to the other eccentric sections (6a, 6b) with respect to the size of the eccentricity (e) and the position of the eccentricity (e), that the first axis (6) with its shaft (10) each in horizontal recesses (8) of the side walls (3a, 3b) of the printer frame (12) and that the first and the second eccentric section (6a, 6b) each on the outer sides (3d) of the side walls (3a, 3b) in resilient plates (13a, 13b) on a reference surface (19).
Figure imgaf001

Description

Die Erfindung betrifft eine Einrichtung zum Verstellen des Abstandes zwischen Druckkopf und Schreibwiderlager eines Druckers, insbesondere eines Matrixdruckers, mit einem auf einem Schlitten angeordneten Druckkopf, mit einer Schlittenführung, bestehend aus einer den Schlitten in Längsrichtung führenden ersten Achse und einer den Schlitten nur in Vertikalrichtung führenden zweiten Achse, wobei die erste Achse in den Bereichen der Seitenwände des Druckers mittels Exzenter-Abschnitten gleicher Exzentrizität gelagert ist und an der Außenseite des Druckers einen Stellhebel trägt.The invention relates to a device for adjusting the distance between the print head and the abutment of a printer, in particular a matrix printer, with a print head arranged on a carriage, with a carriage guide, consisting of a first axis leading the carriage in the longitudinal direction and one leading the carriage only in the vertical direction second axis, the first axis being mounted in the areas of the side walls of the printer by means of eccentric sections of the same eccentricity and carrying an adjusting lever on the outside of the printer.

Derartige Exzenter-Verstelleinrichtungen dienen dem Zweck, durch das Bedienungspersonal einen solchen Abstand zwischen Druckkopf und Auf­zeichnungsträger einzustellen, der im Grunde das beste Schriftbild ergibt bzw. bei Matrixdruckern der Nadelbauart gestattet, die ge­wünschte Anzahl von Durchschriften zu fertigen. Diese optimale Stel­lung des Druckkopfes wird jedoch dann in jedem Fall verlassen, wenn der Austausch eines Farbbandes bzw. einer Farbbandkassette oder das Neueinführen eines andersartigen Aufzeichnungsträgers bzw. des neuen Anfanges eines Aufzeichnungsträgers bei Endlosbahnen erforderlich wird. Sodann treten bei Matrixnadeldruckern Verschleißerscheinungen der Drucknadeln auf, die ein Nachstellen der Drucknadeln bzw. ein Nachschleifen an den Stirnseiten erforderlich machen. In solchen Fällen ist der Ausbau des Druckkopfes erforderlich, so daß der Druckkopf nach Wiedereinbau neu justiert werden muß.Such eccentric adjustment devices serve the purpose of the operator setting such a distance between the printhead and the recording medium which basically gives the best typeface or, in the case of matrix printers of the needle type, allows the desired number of copies to be produced. However, this optimal position of the print head is left in any case when the replacement of an ink ribbon or an ink ribbon cassette or the re-introduction of a different type of recording medium or the new beginning of a recording medium is required for continuous webs. Then, in the case of matrix needle printers, signs of wear of the printing needles occur, which make it necessary to readjust the printing needles or to regrind the end faces. In such cases, the printhead must be removed so that the printhead must be readjusted after it is reinstalled.

Eine mittels Verstell-Exzentern arbeitende Einrichtung zum Verstellen des Abstandes zwischen Druckkopf und Schreibwiderlager eines Druckers, ist z.B. aus der US-PS 4,178,106 bekannt. Unabhängig davon, daß die bekannte Einrichtung im Grunde nur für ein balkenför­miges Druckwiderlager sinnvoll ist, ermangelt es der bekannten Lösung einer ausreichend genauen Festlegung des Stellhebels für die Grund­stellung. Außerdem ist der Abgleich auf eine Null-Lage äußerst ungenau. Ferner ist mit dieser Exzenterverstellung auch eine wenig präzise Führung in Anstelllrichtung verbunden.A device that works by means of adjusting eccentrics to adjust the distance between the print head and the writing abutment a printer, is known for example from US Pat. No. 4,178,106. Regardless of the fact that the known device is basically only useful for a bar-shaped pressure abutment, the known solution lacks a sufficiently precise determination of the actuating lever for the basic position. In addition, the adjustment to a zero position is extremely imprecise. Furthermore, this eccentric adjustment also involves a less precise guidance in the direction of adjustment.

Eine präzisere Führung ergibt sich aus der DE-OS 30 14 823, für die allerdings ein im Druckergehäuse linear geführter Einsatzrahmen er­forderlich ist, der in Richtung der Druckkopfachse senkrecht zur Druckgegenlage verschieblich ist. Diese bekannte Lösung benötigt näm­lich zusätzlich eine zwischen dem Einsatzrahmen und dem Druckerge­häuse zum Festlegen der Verschiebeposition erforderliche Stellvor­richtung. Diese bekannte Lösung vermeidet daher eine wenig präzise Führung in Anstellrichtung, verbindet jedoch einen größeren Aufwand, der aus wirtschaftlichen Gründen nicht immer tragbar ist.A more precise guidance results from DE-OS 30 14 823, for which, however, an insert frame guided linearly in the printer housing is required, which can be displaced in the direction of the print head axis perpendicularly to the print bed. This known solution additionally requires an adjusting device required between the insert frame and the printer housing for fixing the displacement position. This known solution therefore avoids a less precise guidance in the direction of attack, but combines a greater effort, which is not always feasible for economic reasons.

Stand der Technik ist außerdem der Gegenstand des DE-Gebrauchsmusters 71 40 524. Diese Lösung sieht einen nicht anstellbaren Druckkopf vor, hingegen eine verstellbare Druckwalze, wobei an jedem Ende der Walze jeweils eine Verstellungsvorrichtung vorgesehen ist. Der bekannte Gegenstand enthält also im wesentlichen drei bewegliche und mitein­ander gekoppelte Baugruppen, nämlich die schwenkbare Halterung, ein die Verstellungsbewegung empfangendes Hebelelement und ein eine Feinverstellungbewegung empfangendes Kopplungselement. Die Vielzahl der hierzu notwendigen Bauteile bringt zwangsläufig eine Toleranz­kette mit sich, so daß das sich ergebende Spiel zwischen den Bautei­len schon zur Ungenauigkeit der Verstellbewegung führt. So ist z.B. die Parallelität der Verstellbewegungen der auf beiden Seiten der Druckwalze befindlichen Verstellvorrichtungen nicht gewährleistet.The state of the art is also the subject of DE utility model 71 40 524. This solution provides for a print head that cannot be turned on, on the other hand an adjustable print roller, an adjustment device being provided at each end of the roller. The known object thus essentially contains three movable and coupled assemblies, namely the pivotable holder, a lever element receiving the adjustment movement and a coupling element receiving a fine adjustment movement. The large number of components required for this inevitably entails a tolerance chain, so that the resulting play between the components already leads to the inaccuracy of the adjustment movement. For example, the parallelism of the adjustment movements of the adjustment devices located on both sides of the pressure roller is not guaranteed.

Der vorliegenden Erfindung ist die Aufgabe zugrundegelegt, den Gegenstand der eingangs bezeichneten Gattung gegenüber den bekannten Lösungen zu vereinfachen, d.h. mit einer geringeren Anzahl von Bau­teilen auszukommen und gegenüber den bekannten Lösungen einen einfa­cheren Aufbau bei höherer Genauigkeit der Anstellbewegung und vor allen Dingen bei höherer Genauigkeit der Ausgangsstellung zu gewähr­leisten, d.h. die Voraussetzungen für die Null-Lage sowie für die Parallelverstellung und die Einhaltung der Parallelität zu verbes­sern.The present invention is based on the object of simplifying the subject matter of the type described at the outset compared to the known solutions, i.e. to get by with a smaller number of components and, compared to the known solutions, to ensure a simpler construction with higher accuracy of the positioning movement and above all with higher accuracy of the starting position, i.e. to improve the requirements for the zero position as well as for parallel adjustment and compliance with parallelism.

Die gestellte Aufgabe wird erfindungsgemäß dadurch gelöst, daß zur Festlegung des Stellhebels die erste Achse mit einem dritten Exzenter-Abschnitt versehen ist, der bezüglich der Größe der Exzentrizität und der Lage der Exzentrizität mit den anderen Exzenter-Abschnitten übereinstimmt, daß die erste Achse mit ihrem Schaft jeweils in horizontalen Ausnehmungen der Seitenwände des Druckerrahmens geführt ist und daß der erste und der zweite Exzenter-Abschnitt jeweils an den Außenseiten der Seitenwände in Stellplatten an einer Bezugsfläche federnd geführt anliegen. Diese Lösung bedeutet zunächst eine einstückige Achse mit drei Exzenter-­Abschnitten, die entsprechend genau herstellbar sind und bedeutet sodann eine verbesserte Parallelführung und eine verbesserte Justie­rung über die Bezugsfläche. Die Erstjustierung ist damit durch die Verbindung des Stellhebels mit der ersten Achse praktisch optimal ausgeführt und die Parallelverstellung bzw. das Vor- und Zurückstel­len wird durch die Bildung der Bezugsfläche und durch die dauernde Anlage an dieser Bezugsfläche äußerst genau eingehalten.The object is achieved in that the first axis is provided with a third eccentric section for fixing the adjusting lever, which corresponds to the size of the eccentricity and the position of the eccentricity with the other eccentric sections that the first axis with their Shaft is guided in each case in horizontal recesses of the side walls of the printer frame and that the first and the second eccentric section each resiliently bear against the outer sides of the side walls in adjusting plates on a reference surface. This solution initially means a one-piece axis with three eccentric sections, which can be produced accordingly, and then means an improved parallel guidance and an improved adjustment over the reference surface. The initial adjustment is thus carried out practically optimally by the connection of the actuating lever to the first axis, and the parallel adjustment or the forward and backward movement is adhered to extremely precisely by the formation of the reference surface and by the constant contact with this reference surface.

Das Andrücken der ersten Achse mit den entsprechenden Exzenter-­Abschnitten wird nach weiteren Merkmalen dadurch erreicht, daß der erste und der zweite Exzenter-Abschnitt jeweils mittels Federbügeln gegen die Bezugsfläche anstellbar sind.According to further features, the pressing of the first axis with the corresponding eccentric sections is achieved in that the first and second eccentric sections can each be adjusted against the reference surface by means of spring clips.

Die Zuordnung des Stellhebels zu der ersten Achse mit den drei Exzenter-Abschnitten kann außerdem vorteilhalterweise dadurch erfol­gen, daß die in den Stellplatten angeordneten Exzenter-Abschnitte der ersten Achse mit kreisförmigem Querschnitt versehen sind, hingegen der dem Stellhebel zugeordnete dritte Exzenter-Abschnitt mit einem größeren Radius versehen ist und daß an diesen dritten Exzenter-­Abschnitt ein im Radius größerer Bundabschnitt anschließt. Diese Gestaltung gestattet, den Stellhebel neben der radialen Festlegung durch den entsprechenden Exzenter-Abschnitt auch axial ohne größeren Aufwand festzulegen.The assignment of the control lever to the first axis with the three eccentric sections can also advantageously be carried out in that the eccentric sections of the first axis arranged in the setting plates are provided with a circular cross section, whereas the third eccentric section assigned to the control lever is provided with a larger one Radius is provided and that this third eccentric section is adjoined by a collar section which is larger in radius. This design allows the setting lever to be fixed axially in addition to the radial fixing by the corresponding eccentric section without great effort.

Ein horizontaler Verschiebeweg der Stellplatten wird außerden dadurch geschaffen daß die Stallplatten jeweils in horizontalen Langlöchern geführte Paßstifte bzw. Befestigungsschrauben aufweisen.A horizontal displacement path of the adjusting plates is also created in that the stable plates each have dowel pins or fastening screws guided in horizontal elongated holes.

Um eine weitgehend lineare Verstellung zu erreichen, wird vorgeschlagen, daß der Stellhebel bei einer um ca. 15 Grad um die Längsachse der den Schlitten führenden ersten Achse gedrehten Lage der drei Exzenter-Abschnitte in Null-Lage steht. Da der Stellhebel von seiner Null-Lage nur noch in Öffnungsstellung bewegt wird, da die Null-Lage einen Mindestabstand des Druckkopfes zum Druckwiderlager berücksichtigt, wird der Stellhebel in einem günstigen Bereich der Exzentrizitäts- Lage bewegt.In order to achieve a largely linear adjustment, it is proposed that the adjusting lever be in a zero position when the three eccentric sections are rotated by approximately 15 degrees about the longitudinal axis of the first axis guiding the carriage. Since the control lever is only moved from its zero position to the open position, since the zero position takes into account a minimum distance between the print head and the platen, the control lever is moved in a favorable range of the eccentricity position.

Zur Fixierung in den einzelnen Öffnungslagen ist ferner vorgesehen, daß dem Stellhebel ein bogenförmiges Rastsegment für eine am Stell­hebel befestigte Rastnase gegenüberliegt.For fixing in the individual opening positions, it is also provided that the actuating lever is opposite an arc-shaped detent segment for a detent attached to the actuating lever.

In Verbindung mit dem Rastsegment ist noch vorteilhaft, daß dem Stellhebel im Bereich des bogenförmigen Rastsegmentes in beiden Schwenkrichtungen Anschläge zugeordnet sind.In connection with the locking segment, it is also advantageous that the actuating lever in the region of the curved locking segment is assigned stops in both pivoting directions.

Ein Ausführungsbeispiel ist in der Zeichnung darstellt und wird im folgenden näher beschrieben. Es zeigen

  • Fig. 1 einen Querschnitt durch einen mit der Erfindung ausgerüsteten Matrixdrucker,
  • Fig. 2 einen vereinfachten Längsschnitt durch den Matrixdrucker mit Bauteilen, die für die Erfindung von Bedeutung sind,
  • Fig. 3 die Achse mit den drei Exzenter-Abschnitten in Ansicht,
  • Fig. 4 eine Vorderansicht auf die Achse gemäß Fig. 3,
  • Fig. 5 eine Seitenansicht auf das Druckwiderlager, den Druckkopf und den Stellhebel und
  • Fig. 6 eine Seitenansicht auf eine Seitenwand des Druckerrahmens mit Vorderansicht der eingebauten Achse, die die drei Exzenter-Abschnitt aufweist.
An embodiment is shown in the drawing and will be described in more detail below. Show it
  • 1 shows a cross section through a matrix printer equipped with the invention,
  • 2 shows a simplified longitudinal section through the matrix printer with components that are important for the invention,
  • 3 shows the axis with the three eccentric sections in view,
  • 4 is a front view of the axis of FIG. 3,
  • Fig. 5 is a side view of the platen, the printhead and the lever and
  • Fig. 6 is a side view of a side wall of the printer frame with a front view of the built-in axis, which has the three eccentric sections.

Die Einrichtung zum Verstellen des Abstandes zwischen einem Druckkopf (1) und einem Druckwiderlager 2 befindet sich in einem Matrixdrucker (3) der Nadelbauart. Das Druckwiderlager kann hierbei aus einer zylindrischen Schreibwalze (Fig. 2) oder aus einem Druckbalken (2a) <Fig. 5> gebildet sein.The device for adjusting the distance between a print head (1) and a print abutment 2 is located in a matrix printer (3) of the needle type. The pressure abutment can consist of a cylindrical platen (Fig. 2) or a pressure bar (2a) <Fig. 5> be formed.

Der Druckkopf (1) ist auf einem Schlitten (4) angeordnet und mit diesem fest verbunden. Der Schlitten (4) wird aufgrund einer Schlittenführung (5) und eines nicht näher gezeigten Antriebs vor dem Schreibwiderlager (2) und zu diesem parallel mit konstanter Geschwindigkeit hin- und herbewegt. Die Schlittenführung (5) besteht aus einer den Schlitten (4) in Längsrichtung, d.h. parallel zum Druckwiderlager führenden ersten Achse (6) und einer den Schlitten (4) nur in Vertikalrichtung führenden, zweiten Achse (7), die in horizontaler Ebene den Schlitten (4) senkrecht zu seiner Hin- und Herbewegungsrichtung freigibt. Eine horizontale Verlagerung der ersten Achse (6) führt daher zu einer Veränderung des Abstandes zwischen dem Druckkopf (1) und dem Druckwiderlager (2).The print head (1) is arranged on a carriage (4) and firmly connected to it. The carriage (4) is moved back and forth in parallel to and at a constant speed due to a carriage guide (5) and a drive, not shown, in front of the writing abutment (2). The slide guide (5) consists of a slide (4) in the longitudinal direction, ie parallel to Pressure abutment leading first axis (6) and a second axis (7) leading the carriage (4) only in the vertical direction, which releases the carriage (4) in the horizontal plane perpendicular to its direction of back and forth. Horizontal displacement of the first axis (6) therefore leads to a change in the distance between the print head (1) and the print abutment (2).

Die erste Achse (6) ist in den Seitenwänden (3a bzw. 3b) geführt gelagert, und zwar in horizontalen Ausnehnumgen (8), wie in Fig. 6 gezeigt ist. Die neben den Seitenwänden (3a bzw. 3b) befindlichen Exzenter-Abschnitte (6a und 6b) der ersten Achse (6) sind nach Größe und Lage des Exzenters, d.h. der Exzentrizität "e" und des Beginns und des Verlaufs völlig gleich. An der Außenseite (3c) des Matrix­druckers (3) ist ein Stellhebel (9) befestigt, dessen Null-Lage (9a), wie in Fig. 5 gezeigt ist, in direkter Beziehung zur Lage der Exzen­trizität "e" steht. Die Festlegung des Stellhebels (9) erfolgt über einen dritten Exzenter-Abschnitt (6c) mit der Exzentrizität "e" und deren genauen Lage zu den beiden anderen Exzenter-Abschnitten (6a und 6b). Die exakte Exzentrizität "e" und deren Beginn und Ende wird vorteilhafterweise dadurch erzielt, daß die Achse (6) an ihrem Schaft (10) eingespannt und um die Exzentrizität "e" exzentrische eingestellt wird, wonach übliche Drehwerkzeuge die Exzenterabschnitte (6a,6b,6c) bearbeiten bzw. herstellen. Der Stellhebel (9) ist axial mittels Federringen (11) o.dgl. befestigt und gesichert.The first axis (6) is mounted in the side walls (3a or 3b) in a guided manner, specifically in horizontal recesses (8), as shown in FIG. 6. The eccentric sections (6a and 6b) of the first axis (6) located next to the side walls (3a and 3b) are according to the size and position of the eccentric, i.e. the eccentricity "e" and the beginning and the course completely the same. Attached to the outside (3c) of the matrix printer (3) is an adjusting lever (9), the zero position (9a) of which, as shown in FIG. 5, is directly related to the position of the eccentricity "e". The setting of the adjusting lever (9) takes place via a third eccentric section (6c) with the eccentricity "e" and its exact position with respect to the other two eccentric sections (6a and 6b). The exact eccentricity "e" and its beginning and end is advantageously achieved by clamping the shaft (6) on its shaft (10) and adjusting the eccentricity around the eccentricity "e", after which conventional turning tools rotate the eccentric sections (6a, 6b, 6c) edit or produce. The adjusting lever (9) is axially or the like by means of spring washers (11). attached and secured.

In den Seitenwänden (3a,3b) des Druckerrahmens (12) sind lediglich die horizontalen Ausnehmungen (8) vorgesehen, in denen sich die Achse (6) mit dem Schaft (10) in Richtung auf das Druckwiderlager (2) zu-­und wegbewegen kann. An der Außenseite (3d) bilden Stellplatten (13a und 13b) mittels Paßstiften (14) und Befestigungsschrauben (15) eine Abdeckung, so daß die Achse (6) axial festgelegt ist. Währenddem die Exzenter-Abschnitte (6a und 6b) mit einem kreisförmigen Quer­ schnitt (16) versehen sind, ist der Exzenter-Abschnitt (6c) mit dem Radius R (Fig. 4) gebildet, wodurch sich ein im Radius größerer Bund­abschnitt (17) ergibt.Only the horizontal recesses (8) are provided in the side walls (3a, 3b) of the printer frame (12), in which the axis (6) with the shaft (10) can move towards and away from the pressure abutment (2) . On the outside (3d), setting plates (13a and 13b) form a cover by means of dowel pins (14) and fastening screws (15), so that the axis (6) is fixed axially. Meanwhile, the eccentric sections (6a and 6b) with a circular cross cut (16) are provided, the eccentric section (6c) is formed with the radius R (Fig. 4), which results in a larger radius section (17).

Wie Fig. 6 zeigt, wird jeder der Exzenter-Abschnitte (6a und 6b) mittels eines Federbügels (18) gegen eine Bezugsfläche (19) federnd angedrückt. Die Federbügel (18) sind jeweils im Inneren der Stell­platten (13a und 13b) befestigt. Die Befestigungsschrauben (15) und die Paßstifte (14) sind jeweils in Langlöchern (20) geführt, so daß das System der Exzenter-Abschnitte (6a,6b,6c) insgesamt in die gezeichnete Position (Fig. 5) gebracht werden kann. Hierdurch wird die Lage der Bezugsfläche (19) bestimmt. Zunächst wird jedoch der Mindestspalt (21) eingestellt, der z.B. auf den Nadelhub des Druckkopfes (1) abgestimmt ist. Gewöhnlich liegt ein solcher Min­destspalt (21) in der Größenordnung von 0,05 bis 0,15 mm. Sodann werden die Stellplatten (13a und 13b) auf Parallelität eingestellt, in der die Bezugsfläche (19) jeder Stellplatte (13a,13b) denselben Abstand zum Druckwiderlager (2) aufweist. Die Federbügel (18) sorgen für eine dauernde Anlage der Exzenter-Abschnitte (6a und 6b) an der Bezugsfläche (19). Die Verstellrichtungen sind in den Fig. 5 und 6 jeweils mit (22) bezeichnet.As FIG. 6 shows, each of the eccentric sections (6a and 6b) is pressed resiliently against a reference surface (19) by means of a spring clip (18). The spring clips (18) are each fixed inside the adjusting plates (13a and 13b). The fastening screws (15) and the dowel pins (14) are each guided in elongated holes (20) so that the system of the eccentric sections (6a, 6b, 6c) can be brought into the position shown (Fig. 5). This determines the position of the reference surface (19). First, however, the minimum gap (21) is set, which e.g. is matched to the needle stroke of the print head (1). Such a minimum gap (21) is usually on the order of 0.05 to 0.15 mm. Then the setting plates (13a and 13b) are set to parallelism, in which the reference surface (19) of each setting plate (13a, 13b) is at the same distance from the pressure abutment (2). The spring clips (18) ensure that the eccentric sections (6a and 6b) rest permanently on the reference surface (19). The adjustment directions are each designated by (22) in FIGS. 5 and 6.

Um eine weitestgehend lineare Verstellung des Schaftes (10), damit des Schlittens (4) und damit des Druckkopfes (1) vor dem (zylindrischen) Druckwiderlager (2) zu erzielen, kann die Null-Lage (9a) <Fig. 5> auch dahingehend konzipiert sein, daß die Exzentrizität "e" um ca. 15 Grad nach rechts um die Längsachse (23) (der Achse 6) gedreht (nicht gezeichnet) angeordnet wird und hierbei der Stellhebel (9) in der gezeichneten Lage (Fig. 5) angeordnet ist. Diese dort gezeichnete Lage des Stellhebels (9) ist die Null-Lage (9a). In dieser Null-Lage (9a) befindet sich der Mindestspalt (21) auf dem vorgegebenen Maß.In order to achieve a largely linear adjustment of the shaft (10), thus the slide (4) and thus the print head (1) in front of the (cylindrical) print abutment (2), the zero position (9a) <Fig. 5> can also be designed such that the eccentricity "e" is rotated about 15 degrees to the right about the longitudinal axis (23) (axis 6) (not shown) and the adjusting lever (9) is in the position shown ( Fig. 5) is arranged. This position of the adjusting lever (9) shown there is the zero position (9a). In this zero position (9a), the minimum gap (21) is at the specified dimension.

Dem Stellhebel (9) liegt ein gebogenes Rastsegment (24) mit einer am Stellhebel (9) befestigten Rastnase (25) gegenüber. Der Stellhebel (9) wird daher in der in Schwenkrichtung (26) weggeschwenkten Lage, z.B. für das Auswechseln der Farbbandkassette (27) <Fig. 1> mit der Rastnase (25) in die Zahnlücken (28) gestellt, wobei der Abstand zwischen dem Druckwiderlager (2a) und dem Druckkopf (1) entsprechend vergrößert wird. Der Bewegungsweg des Stellhebels (9) ist durch die am Rastsegment (24) vorgsehenen Anschläge (29 und 30) begrenzt.The control lever (9) is opposite a curved locking segment (24) with a locking lug (25) attached to the control lever (9). The adjusting lever (9) is therefore in the position pivoted away in the pivoting direction (26), e.g. for changing the ribbon cassette (27) <Fig. 1> with the locking lug (25) placed in the tooth gaps (28), the distance between the pressure abutment (2a) and the print head (1) being increased accordingly. The path of movement of the adjusting lever (9) is limited by the stops (29 and 30) provided on the detent segment (24).

Die Öffnungsbewegung des Druckkopfes (1) entspricht aufgrund der Schwenkrichtung (26) des Stellhebels (9) einer Drehbewegungsrichtung (31) des Schaftes (10) der Achse (6) um die Längsachse (23) und entspricht einer horizontalen Bewegung des Schaftes (10) in Richtung (32), wobei die Exzenter-Abschnitte (6a und 6b) in Richtung (33) schwenken, so daß der kreisförmige Querschnitt (16) sich in Richtung (34) bewegt.The opening movement of the print head (1) corresponds to a rotational movement direction (31) of the shaft (10) of the axis (6) about the longitudinal axis (23) due to the pivoting direction (26) of the adjusting lever (9) and corresponds to a horizontal movement of the shaft (10) in the direction (32), the eccentric sections (6a and 6b) pivoting in the direction (33) so that the circular cross section (16) moves in the direction (34).

Hierdurch wird der Abstand (immer noch auf die Öffnungsbewegung bezogen) zwischen der Längsachse (23) und der Bezugsfläche (19) kleiner, wodurch sich der Abstand des Druckkopfes (1) vom Druckwiderlager (2) vergrößert. Der kreisförmige Querschnitt (16) wird während der Öffnungsbewegung selbstverständlich wie erläutert mittels der Federbügel (18) gegen die Bezugsfläche (19) gehalten.As a result, the distance (still based on the opening movement) between the longitudinal axis (23) and the reference surface (19) becomes smaller, as a result of which the distance between the print head (1) and the platen (2) increases. The circular cross section (16) is, of course, held against the reference surface (19) by means of the spring clips (18) during the opening movement.

Claims (7)

1. Einrichtung zum Verstellen des Abstandes zwischen Druckkopf und Schreibwiderlager eines Druckers, insbesondere eines Matrixdruckers, mit einem auf einem Schlitten angeordneten Druckkopf, mit einer Schlittenführung, bestehend aus einer den Schlitten in Längsrichtung führenden ersten Achse und einer den Schlitten nur in Vertikalrichtung führenden zweiten Achse, wobei die erste Achse in den Bereichen der Seitenwände des Druckers mittels Exzenter-Abschnitten gleicher Exzentrizität gelagert ist und an der Außenseite des Druckers einen Stellhebel trägt,
dadurch gekennzeichnet,
daß zur Festlegung des Stellhebels (9) die erste Achse (6) mit einem dritten Exzenter-Abschnitt (6c) versehen ist, der bezüglich der Größe der Exzentrizität (e) und der Lage der Exzentrizität (e) mit den anderen Exzenter-Abschnitten (6a,6b) übereinstimmt, daß die erste Achse (6) mit ihrem Schaft (10) jeweils in horizontalen Ausnehmungen (8) der Seitenwände (3a,3b) des Druckerrahmens (12) geführt ist und daß der erste und der zweite Exzenter-Abschnitt (6a,6b) jeweils an den Außenseiten (3d) der Seitenwände (3a,3b) in Stellplatten (13a,13b) an einer Bezugsfläche (19) federnd geführt anliegen.1. Device for adjusting the distance between the print head and the writing abutment of a printer, in particular a matrix printer, with a print head arranged on a carriage, with a carriage guide, consisting of a first axis leading the carriage in the longitudinal direction and a second axis leading the carriage only in the vertical direction , the first axis being mounted in the areas of the side walls of the printer by means of eccentric sections of the same eccentricity and carrying an adjusting lever on the outside of the printer,
characterized,
that to fix the adjusting lever (9) the first axis (6) is provided with a third eccentric section (6c) which with respect to the size of the eccentricity (e) and the position of the eccentricity (e) with the other eccentric sections ( 6a, 6b) that the first axis (6) with its shaft (10) is in each case in horizontal recesses (8) of the side walls (3a, 3b) of the printer frame (12) and that the first and the second eccentric section (6a, 6b) in each case rest against the reference surfaces (19) in a resilient manner on the outer sides (3d) of the side walls (3a, 3b) in setting plates (13a, 13b). 2. Einrichtung nach Anspruch 1,
dadurch gekennzeichnet,
daß der erste und der zweite Exzenterabschnitt (6a,6b) jeweils mittels Federbügeln (18) gegen die Bezugsfläche (19) anstellbar sind.2. Device according to claim 1,
characterized,
that the first and the second eccentric section (6a, 6b) can each be adjusted against the reference surface (19) by means of spring clips (18). 3. Einrichtung nach den Ansprüchen 1 und 2,
dadurch gekennzeichnet,
daß die in den Stellplatten (13,13b) angeordneten Exzenter-­Abschnitte (6a,6b) der ersten Achse (6) mit kreisförmigem Quer­schnitt (16) versehen sind, hingegen der dem Stellhebel (9) zu­geordnete dritte Exzenter-Abschnitt (6c) mit einem größeren Ra­dius (R) versehen ist und daß an diesen dritten Exzenter-­Abschnitt (6c) ein im Radius größerer Bundabschnitt (17) anschließt.3. Device according to claims 1 and 2,
characterized,
that the eccentric sections (6a, 6b) of the first axis (6) arranged in the adjusting plates (13, 13b) are provided with a circular cross section (16), whereas the third eccentric section (6c) assigned to the adjusting lever (9) is also provided is provided with a larger radius (R) and that this third eccentric section (6c) is adjoined by a collar section (17) which is larger in radius. 4. Einrichtung nach den Ansprüchen 1 bis 3,
dadurch gekennzeichnet,
daß die Stellplatten (13a,13b) jeweils in horizontalen Lang­löchern (20) geführte Paßstifte (14) bzw. Befestigungsschrauben (15) aufweisen.4. Device according to claims 1 to 3,
characterized,
that the adjusting plates (13a, 13b) each have dowel pins (14) or fastening screws (15) guided in horizontal elongated holes (20). 5. Einrichtung nach den Ansprüchen 1 bis 4,
dadurch gekennzeichnet,
daß der Stellhebel (9) bei einer um ca. 15 Grad um die Längsachse (23) der den Schlitten (4) führenden ersten Achse (6) gedrehten Lage der drei Exzenter-Abschnitte (6a,6b,6c) in Null-Lage (9a) steht.5. Device according to claims 1 to 4,
characterized,
that the adjusting lever (9) in a position of the three eccentric sections (6a, 6b, 6c) rotated about 15 degrees around the longitudinal axis (23) of the first axis (6) guiding the slide (4) in the zero position ( 9a). 6. Einrichtung nach den Ansprüchen 1 bis 5,
dadurch gekennzeichnet,
daß dem Stellhebel (9) ein bogenförmiges Rastsegment (24) für eine am Stellhebel (9) befestigte Rastnase (25) gegenüberliegt.6. Device according to claims 1 to 5,
characterized,
that the actuating lever (9) is opposite an arc-shaped detent segment (24) for a detent (25) attached to the actuating lever (9). 7. Einrichtung nach den Ansprüchen 1 bis 6,
dadurch gekennzeichnet,
daß dem Stellhebel (9) im Bereich des bogenförmigen Rastsegmentes (24) in beiden Schwenkrichtungen (26) Anschläge (29,30) zugeordnet sind.7. Device according to claims 1 to 6,
characterized,
that the actuating lever (9) in the region of the arcuate locking segment (24) in both pivot directions (26) stops (29,30) are assigned.
EP87101985A 1986-03-11 1987-02-12 Print head platen distance adjusting device for a printer particularly for a matrix printer Expired - Lifetime EP0236773B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87101985T ATE68137T1 (en) 1986-03-11 1987-02-12 DEVICE FOR ADJUSTING THE DISTANCE BETWEEN PRINT HEAD AND PRINT REST OF A PRINTER, ESPECIALLY. OF A MATRIX PRINTER.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3608001 1986-03-11
DE19863608001 DE3608001A1 (en) 1986-03-11 1986-03-11 DEVICE FOR ADJUSTING THE DISTANCE BETWEEN PRINT HEAD AND WRITING REQUEST OF A PRINTER, IN PARTICULAR. A MATRIX PRINTER

Publications (3)

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EP0236773A2 true EP0236773A2 (en) 1987-09-16
EP0236773A3 EP0236773A3 (en) 1989-09-06
EP0236773B1 EP0236773B1 (en) 1991-10-09

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ID=6296025

Family Applications (1)

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EP87101985A Expired - Lifetime EP0236773B1 (en) 1986-03-11 1987-02-12 Print head platen distance adjusting device for a printer particularly for a matrix printer

Country Status (5)

Country Link
US (1) US4720200A (en)
EP (1) EP0236773B1 (en)
JP (1) JPS62221571A (en)
AT (1) ATE68137T1 (en)
DE (2) DE3608001A1 (en)

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Also Published As

Publication number Publication date
EP0236773A3 (en) 1989-09-06
ATE68137T1 (en) 1991-10-15
JPS62221571A (en) 1987-09-29
EP0236773B1 (en) 1991-10-09
DE3608001A1 (en) 1987-09-24
US4720200A (en) 1988-01-19
DE3773509D1 (en) 1991-11-14
DE3608001C2 (en) 1989-04-06

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