EP0082462B1 - Electrographic printer - Google Patents

Electrographic printer Download PDF

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Publication number
EP0082462B1
EP0082462B1 EP82111568A EP82111568A EP0082462B1 EP 0082462 B1 EP0082462 B1 EP 0082462B1 EP 82111568 A EP82111568 A EP 82111568A EP 82111568 A EP82111568 A EP 82111568A EP 0082462 B1 EP0082462 B1 EP 0082462B1
Authority
EP
European Patent Office
Prior art keywords
print head
cam follower
carrier
cam
rod
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
EP82111568A
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German (de)
French (fr)
Other versions
EP0082462A2 (en
EP0082462A3 (en
Inventor
John Edward Drejza
Donald Franklin Manning
Joseph Townsend Wilson Iii
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.)
International Business Machines Corp
Original Assignee
International Business Machines Corp
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 International Business Machines Corp filed Critical International Business Machines Corp
Publication of EP0082462A2 publication Critical patent/EP0082462A2/en
Publication of EP0082462A3 publication Critical patent/EP0082462A3/en
Application granted granted Critical
Publication of EP0082462B1 publication Critical patent/EP0082462B1/en
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
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/385—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective supply of electric current or selective application of magnetism to a printing or impression-transfer material
    • B41J2/425—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective supply of electric current or selective application of magnetism to a printing or impression-transfer material for removing surface layer selectively from electro-sensitive material, e.g. metal coated paper
    • 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
    • B41J25/312—Bodily-movable mechanisms for print heads or carriages movable towards or from paper surface with print pressure adjustment mechanisms, e.g. pressure-on-the paper mechanisms

Definitions

  • the invention relates to an electrographic printing unit with a print head carriage which is longitudinally movable and pivotable on a parallel parallel guide rod and which can be pivoted with the print head from its raised position under spring force into the working position for contacting the recording medium, with a control element arranged parallel to the guide rod for controlling the pivoting movement of the print head carriage
  • a cam rod with an inclined ramp area is provided, against which a cam follower element connected to the print head carriage bears, which slides along the inclined ramp during the print head carriage movement and thereby swivels the slide with the print head from its one position to its other.
  • US-A-3 845 850 describes an electrographic printing unit with a print head carriage which is longitudinally movable and pivotable along a parallel guide rod and which can be pivoted with the print head from its raised position under spring force into the working position for contacting the recording medium, one on the print head carriage Arranged follower element, which rests under the force of a spring on the cam surface of a cam rod arranged parallel to the guide rod.
  • This cam surface has areas that determine the lifted position and the working position of the printhead, as well as ramp areas that determine the lifting or releasing.
  • US-A-3 646 570 discloses an electrographic printing unit with a printhead carriage which is longitudinally movable and pivotable on a parallel guide rod and which can be swiveled with the printhead from its raised position into the working position for contacting the recording medium, a follower element being arranged on the printhead carriage which rests on the cam surface of a cam rod arranged parallel to the guide rod and the cam surface has the areas determining the lifted position and the working position of the printhead, and areas determining the lifting or releasing.
  • the follow element is positively guided in the guide rod in the manner of a link guide.
  • the invention has for its object to equip the control of an electrographic printing unit of the type described above with a new pivoting mechanism for the print head carriage.
  • the printing unit according to the invention has the advantage over the known printing unit designs that the print head is pressed elastically into its working position or is lifted off again.
  • the electrographic printing unit shown in FIG. 1 contains a print head carriage 10 which can be moved along a guide rod 11 which is arranged between the side frame parts 12 and 13.
  • the movement of the print head carriage 10 on the guide rod 11 is transmitted via a belt or rope 14, which is driven via a drive roller (not shown) guided in a console 15, driven by a reversible servo motor 16, and via a deflection roller 17, a cam drive pulley 18 and another Deflection roller 19 is guided on the opposite side of the printing unit.
  • Metallized paper is introduced beneath paper guide rollers 20 and is gripped by transport rollers 21 when the platen roller 22 is stepped on.
  • the cam drive disk 18 causes the cam 23a of a cam disk 23 which rotates with the cam drive disk 18 to rotate against a cam follower roller 24a which is arranged on an arm 24 which can be pivoted about a pin 25.
  • the arm 24 carries a drive pawl 26 which engages in a ratchet wheel 27 and in each case advances the platen roller 22 by one print line.
  • the pawl 28 counteracts any reverse rotation of the platen roller 22.
  • the cam 23a and the print head carriage 10 cooperate in such a way that a step change into the next print line is carried out each time the print head carriage 10 reaches the end of the line.
  • the cam disk 23 is rotated by a little more than one full revolution.
  • An emitter disk 29 on the shaft of the servo motor 16, in cooperation with an optical scanning element 30, generates electrical signals which represent the respective position of the print head carriage 10 of the line.
  • the impression on the metallized paper is carried out by electrodes 32 on the print head 33 mounted in the print head carriage 10 coming into contact with the paper on the platen roller 22 and being switched on, causing the metal to burn off on the corresponding area of paper, causing one below it color contrast layer is visible.
  • the electrodes are arranged in a pair of staggered rows in the normal for printhead carriage feed movement and bil the desired characters in the form of small eroded points during the transverse movement of the print head carriage 10.
  • the print head 33 and the electrodes 32 are lifted off the paper, the line feed is carried out by means of the platen roller 22, the drive direction of the servo motor 16 is reversed and the print head carriage 10 is thus moved back in the opposite direction, the print head and the electrodes being lowered again .
  • cam follower rollers 35 and 36 are arranged on cam follower arms 37 and 38, respectively, the rollers abutting a transversely extending cam rod 39.
  • the cam surface 40 of the cam rod 39 is designed such that the cam follower arm 38 with the cam follower roller 36 releases the adjustment of the electrodes 32 towards the paper as soon as the print head carriage 10 leaves the edge region.
  • the position of the ramp area 41 near the left edge and the ramp area 42 near the right edge of the paper is decisive for the position at which this takes place.
  • a carriage support 43 with a base plate 44 with a guide bore 45, through which the guide rod 11 protrudes and enables the longitudinal and rotary movement of the print head carriage 10.
  • the carriage support 43 also has support parts 46 and 47 on which the print head 33 or, by means of a clamp part 47a, flat cable 48 are guided.
  • a cable holder 50 is attached to the carriage support 43 by means of a pair of screws 49, each with a hook 51 at its ends, into which the cable 14 is suspended, by means of which the line-parallel adjusting movements of the print head carriage 10 are transmitted on the guide rod 11.
  • the base plate 44 also carries a pin 52 on which the upper cam follower arm 37 and the lower cam follower arm 38 are mounted.
  • the cam follower rollers 35 and 36 are each guided by means of bearing axles 35a and 36a, which in turn rest in corresponding recesses in the cam follower arms 37 and 38.
  • a tension spring 53 stretched between bolts 54 pulls the two cam follower arms 37 and 38 towards one another and thus causes the associated cam follower rollers 35 and 36 on the upper guide surface 55 (FIG. 3) and the lower cam surface 40 (FIGS. 1 and 3) of the cam rod 39 concerns.
  • a retaining bolt 56 each with a collar at its ends, is arranged between the upper surface of the carrier part 47 and the lower surface of the cam follower arm 38 in such a way that it determines the maximum distance between these two elements.
  • a compression spring 58 held in its axial position by means of centering rings 59 causes the carrier part 47 and thus the slide carrier 43 to be pushed away from the cam follower arm 38 up to the distance determined by the retaining bolt 56, while at the same time a pivoting movement of the slide carrier 43 in the clockwise direction, i.e. in the direction to the cam follower arm 38, is possible.
  • the compression spring 58 has the function of limiting and determining the force with which the electrodes 32 are pressed against the paper.
  • the print head carriage 10 performs an adjustment movement along the print line
  • the upper cam follower arm 37 lies with its cam follower roller 35 on the upper guide surface 55 of the cam rod 39, the upper guide surface 55, as can be seen in FIG. 1, over the entire length of the cam rod 39 runs evenly, i.e. in one plane.
  • the lower cam follower arm 38 with its cam follower roller 36 passes through the ramp areas 41 and 42, as a result of which it is pivoted somewhat downward in the areas near the line ends.
  • the tension spring 53 causes a certain upward pivoting movement of the cam follower arm 38 under the control of the ramp area 41 or 42. This simultaneously raises the retaining pin 56 and below Due to the action of the compression spring 58, the slide carrier 43 carries out a counterclockwise pivoting movement with the print head 33 (FIGS. 2 and 3), the electrodes 32 coming into contact with the paper. During the subsequent impression process, the retaining bolt 56 is thus ineffective, since the slide carrier 43 and the lower cam follower arm 38 are held in their relative position to one another by the forces of the tension spring 53 and the compression spring 58 acting in the opposite direction, the tension spring 53 naturally exerting the greater force .
  • the compression spring 58 not only determines the force with which the electrodes 32 are pressed onto the paper during the printing process, but also inaccuracies in the electrode spacing in the course of the line movement and manufacturing tolerances within the elements involved compensates.

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  • Common Mechanisms (AREA)
  • Electronic Switches (AREA)
  • Character Spaces And Line Spaces In Printers (AREA)

Description

Die Erfindung betrifft ein elektrographisches Druckwerk mit einem auf einer zeilenparallelen Führungsstange längsbeweglich und schwenkbar geführten Druckkopfschlitten, der mit dem Druckkopf aus dessen abgehobener Position unter Federkraft in die Arbeitsposition zum Anliegen am Aufzeichnungsträger schwenkbar ist, wobei zur Steuerung der Schwenkbewegung des Druckkopfschlittens eine parallel zur Führungsstange angeordnete Nockenstange mit schrägem Rampenbereich vorgesehen ist, an der ein mit dem Druckkopfschlitten in Verbindung stehendes Nockenfolgeelement anliegt, das bei der Druckkopfschlittenbewegung auf der schrägen Rampe entlang gleitet und dadurch den Schlitten mit dem Druckkopf aus seiner einen in seine andere Position verschwenkt.The invention relates to an electrographic printing unit with a print head carriage which is longitudinally movable and pivotable on a parallel parallel guide rod and which can be pivoted with the print head from its raised position under spring force into the working position for contacting the recording medium, with a control element arranged parallel to the guide rod for controlling the pivoting movement of the print head carriage A cam rod with an inclined ramp area is provided, against which a cam follower element connected to the print head carriage bears, which slides along the inclined ramp during the print head carriage movement and thereby swivels the slide with the print head from its one position to its other.

In der US-A-3 845 850 ist ein elektrographisches Druckwerk mit einem entlang einer zeilenparallelen Führungsstange längsbeweglichen und schwenkbar geführten Druckkopfschlitten beschrieben, der mit dem Druckkopf aus dessen abgehobener Position unter Federkraft in die Arbeitsposition zum Anliegen am Aufzeichnungsträger schwenkbar ist, wobei am Druckkopfschlitten ein Folgeelement angeordnet ist, das unter der Kraft einer Feder auf der Nockenfläche einer parallel zur Führungsstange angeordneten Nockenstange aufliegt. Diese Nockenfläche besitzt Bereiche, die die abgehobene Position und die Arbeitsposition des Druckkopfes bestimmen, sowie Rampenbereiche aufweisen, die das Abheben bzw. Freigeben bestimmen.US-A-3 845 850 describes an electrographic printing unit with a print head carriage which is longitudinally movable and pivotable along a parallel guide rod and which can be pivoted with the print head from its raised position under spring force into the working position for contacting the recording medium, one on the print head carriage Arranged follower element, which rests under the force of a spring on the cam surface of a cam rod arranged parallel to the guide rod. This cam surface has areas that determine the lifted position and the working position of the printhead, as well as ramp areas that determine the lifting or releasing.

Die US-A-3 646 570 offenbart ein elektrographisches Druckwerk mit einem auf einer zeilenparallelen Führungsstange längsbeweglich und schwenkbar geführten Druckkopfschlitten, der mit dem Druckkopf aus dessen abgehobener Position in die Arbeitsposition zum Anliegen am Aufzeichnungsträger schwenkbar ist, wobei am Druckkopfschlitten ein Folgeelement angeordnet ist, das auf der Nockenfläche einer parallel zur Führungsstange angeordneten Nockenstange aufliegt und die Nockenfläche die abgehobene Position und die Arbeitsposition des Druckkopfes bestimmende Bereiche, sowie das Abheben bzw. Freigeben bestimmende Bereiche aufweist. Hierbei ist das Folgeelement in der Führungsstange zwangsgeführt nach Art einer Kulissenführung.US-A-3 646 570 discloses an electrographic printing unit with a printhead carriage which is longitudinally movable and pivotable on a parallel guide rod and which can be swiveled with the printhead from its raised position into the working position for contacting the recording medium, a follower element being arranged on the printhead carriage which rests on the cam surface of a cam rod arranged parallel to the guide rod and the cam surface has the areas determining the lifted position and the working position of the printhead, and areas determining the lifting or releasing. Here, the follow element is positively guided in the guide rod in the manner of a link guide.

Der Erfindung liegt die Aufgabe zugrunde, die Steuerung eines elektrographischen Druckwerkes der eingangs beschriebenen Gattung mit einem neuen Verschwenkmechanismus für den Druckkopfschlitten auszurüsten. Das Druckwerk gemäss der Erfindung bietet gegenüber den bekannten Druckwerksausbildungen den Vorteil, dass der Druckkopf elastisch in seine Arbeitsposition gedrückt wird bzw. wieder davon abgehoben wird.The invention has for its object to equip the control of an electrographic printing unit of the type described above with a new pivoting mechanism for the print head carriage. The printing unit according to the invention has the advantage over the known printing unit designs that the print head is pressed elastically into its working position or is lifted off again.

Diese Aufgabe wird durch die Merkmale des Anspruches 1 gelöst.This object is solved by the features of claim 1.

Weitere vorteilhafte Ausführungsformen der Erfindung sind den Unteransprüchen zu entnehmen.Further advantageous embodiments of the invention can be found in the subclaims.

Nachfolgend wird die Erfindung anhand der Zeichnungen in einem Ausführungsbeispiel eines elektrographischen Druckwerkes, auch als Elektroerosionsdrucker bezeichnet, erläutert. Es zeigen:

  • Fig. 1 eine perspektivische Darstellung eines Matrixdruckers mit einem parallel zur Schreibwalze beweglichen Druckkopfschlitten,
  • Fig. 2 eine vergrössserte Darstellung des Druckkopfschlittens des Druckwerks gemäss Fig. 1, in perspektivischer Darstellung von der anderen Seite, und
  • Fig. 3 einen Schnitt durch den Druckkopfschlitten in der Ebene 3-3 in Fig. 2.
The invention is explained below with reference to the drawings in an exemplary embodiment of an electrographic printing unit, also referred to as an electroerosion printer. Show it:
  • 1 is a perspective view of a matrix printer with a print head carriage movable parallel to the platen,
  • Fig. 2 is an enlarged view of the print head carriage of the printing unit according to FIG. 1, in a perspective view from the other side, and
  • 3 shows a section through the print head carriage in the plane 3-3 in FIG. 2.

Das in Fig. 1 dargestellte elektrographische Druckwerk enthält einen Druckkopfschlitten 10, der längs einer Führungsstange 11 bewegbar ist, die zwischen den seitlichen Rahmenteilen 12 und 13 angeordnet ist. Die Bewegung des Druckkopfschlittens 10 auf der Führungsstange 11 wird über ein Band oder Seil 14 übertragen, das über eine in einer Konsole 15 geführte, von einem umpolbaren Servomotor 16 angetriebene (nicht gezeigte) Antriebsrolle sowie über eine Umlenkrolle 17, eine Nockenantriebsscheibe 18 und eine weitere Umlenkrolle 19 an der entgegengesetzten Seite des Druckwerks geführt ist. Unterhalb von Papierführungsrollen 20 wird metallisiertes Papier eingeführt und von Transportrollen 21 erfasst, wenn die Schreibwalze 22 schrittweise weitergeschaltet wird.The electrographic printing unit shown in FIG. 1 contains a print head carriage 10 which can be moved along a guide rod 11 which is arranged between the side frame parts 12 and 13. The movement of the print head carriage 10 on the guide rod 11 is transmitted via a belt or rope 14, which is driven via a drive roller (not shown) guided in a console 15, driven by a reversible servo motor 16, and via a deflection roller 17, a cam drive pulley 18 and another Deflection roller 19 is guided on the opposite side of the printing unit. Metallized paper is introduced beneath paper guide rollers 20 and is gripped by transport rollers 21 when the platen roller 22 is stepped on.

Wird das Band 14 durch den Motor 16 angetrieben, so bewirkt die Nockenantriebsscheibe 18 die Drehung des Nockens 23a einer Nockenscheibe 23, die mit der Nockenantriebsscheibe 18 umläuft, gegen eine Nockenfolgerolle 24a, die auf einem um einen Stift 25 schwenkbaren Arm 24 angeordnet ist. Der Arm 24 trägt eine Antriebsklinke 26, die in ein Klinkrad 27 eingreift und die Schreibwalze 22 jeweils um eine Druckzeile weiterschaltet. Die Sperrklinke 28 wirkt hierbei jeder Rückdrehung der Schreibwalze 22 entgegen. Der Nocken 23a sowie der Druckkopfschlitten 10 wirken so zusammen, dass jedesmal, wenn der Druckkopfschlitten 10 das Zeilenende erreicht, eine Schrittschaltung in die nächste Druckzeile ausgeführt wird. Hierzu wird bei jeder vollen Vorschubbewegung des Druckkopfschlittens 10 über die Zeilenbreite die Nockenscheibe 23 um etwas mehr als eine volle Umdrehung gedreht. Eine Emitterscheibe 29 auf der Welle des Servomotors 16 erzeugt im Zusammenwirken mit einem optischen Abtastelement 30 elektrische Signale, die die jeweilige Position des Druckkopfschlittens 10 der Zeile darstellen.If the belt 14 is driven by the motor 16, the cam drive disk 18 causes the cam 23a of a cam disk 23 which rotates with the cam drive disk 18 to rotate against a cam follower roller 24a which is arranged on an arm 24 which can be pivoted about a pin 25. The arm 24 carries a drive pawl 26 which engages in a ratchet wheel 27 and in each case advances the platen roller 22 by one print line. The pawl 28 counteracts any reverse rotation of the platen roller 22. The cam 23a and the print head carriage 10 cooperate in such a way that a step change into the next print line is carried out each time the print head carriage 10 reaches the end of the line. For this purpose, with each full feed movement of the print head carriage 10 over the line width, the cam disk 23 is rotated by a little more than one full revolution. An emitter disk 29 on the shaft of the servo motor 16, in cooperation with an optical scanning element 30, generates electrical signals which represent the respective position of the print head carriage 10 of the line.

Der Abdruck auf dem metallisierten Papier wird dadurch ausgeführt, dass Elektroden 32 auf dem im Druckkopfschlitten 10 gelagerten Druckkopf 33 in Kontakt mit dem Papier auf der Schreibwalze 22 gelangen und eingeschaltet werden, wobei sie ein Abbrennen des Metalls auf dem entsprechenden Papierbereich bewirken, wodurch eine darunter befindliche Farbkontrastschicht sichtbar wird. Die Elektroden sind in einem Paar von gegeneinander versetzten Reihen in der Normalen zur Druckkopfschlittenvorschubbewegung angeordnet und bilden während der Querbewegung des Druckkopfschlittens 10 matrixartig die gewünschten Zeichen in Form kleiner erodierter Punkte. Gegen Ende des Zeilenendes werden der Druckkopf 33 und die Elektroden 32 vom Papier abgehoben, mittels der Schreibwalze 22 der Zeilenvorschub ausgeführt, die Antriebsrichtung des Servomotors 16 umgekehrt und somit der Druckkopfschlitten 10 in die entgegengesetzte Richtung zurückbewegt, wobei der Druckkopf und die Elektroden wieder abgesenkt werden.The impression on the metallized paper is carried out by electrodes 32 on the print head 33 mounted in the print head carriage 10 coming into contact with the paper on the platen roller 22 and being switched on, causing the metal to burn off on the corresponding area of paper, causing one below it color contrast layer is visible. The electrodes are arranged in a pair of staggered rows in the normal for printhead carriage feed movement and bil the desired characters in the form of small eroded points during the transverse movement of the print head carriage 10. Towards the end of the line end, the print head 33 and the electrodes 32 are lifted off the paper, the line feed is carried out by means of the platen roller 22, the drive direction of the servo motor 16 is reversed and the print head carriage 10 is thus moved back in the opposite direction, the print head and the electrodes being lowered again .

Zum Zwecke der vorher beschriebenen Verstellung des Druckkopfes 33 mit den Elektroden 32 zum Papier bzw. vom Papier weg sind Nockenfolgerollen 35 und 36 auf Nockenfolgearmen 37 bzw. 38 angeordnet, wobei die Rollen an einer transversal verlaufenden Nockenstange 39 anliegen. Die Nockenfläche 40 der Nockenstange 39 ist, wie Fig. 1 zeigt, so gestaltet, dass der Nockenfolgearm 38 mit der Nockenfolgerolle 36 die Verstellung der Elektroden 32 zum Papier hin freigibt, sobald der Druckkopfschlitten 10 den Randbereich verlässt. Massgeblich für die Position, an der dies stattfindet, ist die Lage des Rampenbereiches 41 nahe dem linken Rand und des Rampenbereiches 42 nahe dem rechten Rand des Papiers.For the purpose of the previously described adjustment of the print head 33 with the electrodes 32 to the paper or away from the paper, cam follower rollers 35 and 36 are arranged on cam follower arms 37 and 38, respectively, the rollers abutting a transversely extending cam rod 39. 1, the cam surface 40 of the cam rod 39 is designed such that the cam follower arm 38 with the cam follower roller 36 releases the adjustment of the electrodes 32 towards the paper as soon as the print head carriage 10 leaves the edge region. The position of the ramp area 41 near the left edge and the ramp area 42 near the right edge of the paper is decisive for the position at which this takes place.

Nach den Fign. 2 und 3 befindet sich am Druckkopfschlitten 10 ein Schlittenträger 43 mit einer Grundplatte 44 mit einer Führungsbohrung 45, durch welche die Führungsstange 11 ragt und die Längs- und Drehbewegung des Druckkopfschlittens 10 ermöglicht. Der Schlittenträger 43 weist weiterhin Trägerteile 46 und 47 auf, auf denen der Druckkopf 33 bzw., mittels eines Klammerteils 47a, Flachkabel 48 geführt sind. Weiterhin ist am Schlittenträger 43 mittels eines Schraubenpaares 49 eine Kabelhalterung 50 angebracht, mit je einem Haken 51 an ihren Enden, in die das Seil 14 eingehängt ist, mittels dessen die zeilenparallelen Stellbewegungen des Druckkopfschlittens 10 auf der Führungsstange 11 übertragen werden.According to FIGS. 2 and 3, on the print head carriage 10 there is a carriage support 43 with a base plate 44 with a guide bore 45, through which the guide rod 11 protrudes and enables the longitudinal and rotary movement of the print head carriage 10. The carriage support 43 also has support parts 46 and 47 on which the print head 33 or, by means of a clamp part 47a, flat cable 48 are guided. Furthermore, a cable holder 50 is attached to the carriage support 43 by means of a pair of screws 49, each with a hook 51 at its ends, into which the cable 14 is suspended, by means of which the line-parallel adjusting movements of the print head carriage 10 are transmitted on the guide rod 11.

Die Grundplatte 44 trägt weiterhin einen Stift 52, auf dem der obere Nockenfolgearm 37 und der untere Nockenfolgearm 38 gelagert sind. Die Nokkenfolgerollen 35 und 36 sind jeweils mittels Lagerachsen 35a bzw. 36a geführt, die ihrerseits in entsprechenden Aussparungen in den Nockenfolgearmen 37 und 38 ruhen. Eine zwischen Bolzen 54 gespannte Zugfeder 53 zieht die beiden Nokkenfolgearme 37 und 38 zueinander und bewirkt somit, dass die zugeordneten Nockenfolgerollen 35 und 36 auf der oberen Führungsfläche 55 (Fig. 3) und der unteren Nockenfläche 40 (Fign. 1 und 3) der Nockenstange 39 anliegen.The base plate 44 also carries a pin 52 on which the upper cam follower arm 37 and the lower cam follower arm 38 are mounted. The cam follower rollers 35 and 36 are each guided by means of bearing axles 35a and 36a, which in turn rest in corresponding recesses in the cam follower arms 37 and 38. A tension spring 53 stretched between bolts 54 pulls the two cam follower arms 37 and 38 towards one another and thus causes the associated cam follower rollers 35 and 36 on the upper guide surface 55 (FIG. 3) and the lower cam surface 40 (FIGS. 1 and 3) of the cam rod 39 concerns.

Ein Haltebolzen 56 mit je einem Bund an seinen Enden ist derart zwischen der oberen Fläche des Trägerteiles 47 und der unteren Fläche des Nokkenfolgearms 38 angeordnet, dass er den maximalen Abstand zwischen diesen beiden Elementen bestimmt. Dabei bewirkt eine mittels Zentrierringen 59 in ihrer Axialposition gehaltene Druckfeder 58, dass der Trägerteil 47 und damit der Schlittenträger 43 bis zu dem durch den Haltebolzen 56 bestimmten Abstand vom Nockenfolgearm 38 weggedrückt werden, während gleichzeitig eine Schwenkbewegung des Schlittenträgers 43 im Uhrzeigersinn, also in Richtung zum Nockenfolgearm 38, möglich ist. Die Druckfeder 58 hat hierbei die Funktion, die Kraft zu begrenzen sowie zu bestimmen, mit der die Elektroden 32 gegen das Papier gedrückt werden.A retaining bolt 56, each with a collar at its ends, is arranged between the upper surface of the carrier part 47 and the lower surface of the cam follower arm 38 in such a way that it determines the maximum distance between these two elements. A compression spring 58 held in its axial position by means of centering rings 59 causes the carrier part 47 and thus the slide carrier 43 to be pushed away from the cam follower arm 38 up to the distance determined by the retaining bolt 56, while at the same time a pivoting movement of the slide carrier 43 in the clockwise direction, i.e. in the direction to the cam follower arm 38, is possible. The compression spring 58 has the function of limiting and determining the force with which the electrodes 32 are pressed against the paper.

Im folgenden wird die Arbeitsweise der beschriebenen Anordnung beschrieben. Führt der Druckkopfschlitten 10 eine Verstellbewegung längs der Druckzeile aus, so liegt der obere Nokkenfolgearm 37 mit seiner Nockenfolgerolle 35 auf der oberen Führungsfläche 55 der Nockenstange 39 an, wobei, wie aus Fig. 1 hervorgeht, die obere Führungsfläche 55 über die gesamte Länge der Nockenstange 39 gleichmässig, also in einer Ebene verläuft. Der untere Nockenfolgearm 38 mit seiner Nockenfolgerolle 36 durchläuft jedoch, wie gleichfalls Fig. 1 deutlich macht, die Rampenbereiche 41 und 42, in deren Folge er in den Bereichen nahe den Zeilenenden etwas nach unten geschwenkt wird. Wenn daher der Druckkopfschlitten 10 seine Bewegung von einem Zeilenende in Richtung auf das andere Ende der Zeile beginnt, bewirkt die Zugfeder 53 unter der Steuerung des Rampenbereichs 41 bzw. 42 eine gewisse Aufwärtsschwenkbewegung des Nockenfolgearmes 38. Hierdurch wird gleichzeitig der Haltebolzen 56 angehoben, und unter der Wirkung der Druckfeder 58 führt der Schlittenträger 43 mit dem Druckkopf 33 eine Schwenkbewegung entgegen dem Uhrzeigersinn (Fign. 2 und 3) aus, wobei die Elektroden 32 in Kontakt mit dem Papier gelangen. Während des darauffolgenden Abdruckvorganges ist somit der Haltebolzen 56 unwirksam, da der Schlittenträger 43 und der untere Nockenfolgearm 38 durch die in entgegengesetzter Richtung wirksamen Kräfte der Zugfeder 53 und der Druckfeder 58 in ihrer Relativlage zueinander gehalten werden, wobei selbstverständlich die Zugfeder 53 die grössere Kraft ausübt. Wenn nun nach Durchlaufen der Zeile der Druckkopfschlitten 10 sich dem entgegengesetzten Ende der Nockenfläche 40 nähert, wird der untere Nockenfolgearm 38 unter der Wirkung des Rampenbereiches 42 bzw. 41 nach unten geschwenkt, so dass der Haltebolzen 56 den Schlittenträger 43 (im Sinne der Fig. 3) im Uhrzeigersinn schwenkt und somit die Elektroden 32 vom Papier abhebt. Es wird darauf hingewiesen, dass die Druckfeder 58 im Verlauf des Druckvorganges nicht nur, wie bereits erwähnt, die Kraft bestimmt, mit der die Elektroden 32 auf das Papier gedrückt werden, sondern auch Ungenauigkeiten des Elektrodenabstandes im Verlauf der Zeilenbewegung sowie Fertigungstoleranzen innerhalb der beteiligten Elemente ausgleicht.The operation of the described arrangement is described below. If the print head carriage 10 performs an adjustment movement along the print line, the upper cam follower arm 37 lies with its cam follower roller 35 on the upper guide surface 55 of the cam rod 39, the upper guide surface 55, as can be seen in FIG. 1, over the entire length of the cam rod 39 runs evenly, i.e. in one plane. However, the lower cam follower arm 38 with its cam follower roller 36, as is also made clear in FIG. 1, passes through the ramp areas 41 and 42, as a result of which it is pivoted somewhat downward in the areas near the line ends. Therefore, when the print head carriage 10 starts moving from one end of the line towards the other end of the line, the tension spring 53 causes a certain upward pivoting movement of the cam follower arm 38 under the control of the ramp area 41 or 42. This simultaneously raises the retaining pin 56 and below Due to the action of the compression spring 58, the slide carrier 43 carries out a counterclockwise pivoting movement with the print head 33 (FIGS. 2 and 3), the electrodes 32 coming into contact with the paper. During the subsequent impression process, the retaining bolt 56 is thus ineffective, since the slide carrier 43 and the lower cam follower arm 38 are held in their relative position to one another by the forces of the tension spring 53 and the compression spring 58 acting in the opposite direction, the tension spring 53 naturally exerting the greater force . If, after passing through the line, the print head carriage 10 approaches the opposite end of the cam surface 40, the lower cam follower arm 38 is pivoted downward under the action of the ramp area 42 or 41, so that the retaining bolt 56 moves the carriage carrier 43 (in the sense of FIG. 3) pivots clockwise, thus lifting the electrodes 32 off the paper. It is pointed out that the compression spring 58 not only determines the force with which the electrodes 32 are pressed onto the paper during the printing process, but also inaccuracies in the electrode spacing in the course of the line movement and manufacturing tolerances within the elements involved compensates.

Die Nockenfolgearme 37 und 38 sind in der dargestellten Ausführung um den in der Grundplatte 44 befindlichen Stift 52 drehbar gelagert. Sie können aber statt dessen auch um die Führungsstange 11 oder um zylindrische Führungselemente an der Grundplatte 44 konzentrisch zur Führungsbohrung 45 schwenkbar angeordnet sein. Bei der vorherigen Ausführung wäre jedoch die Gleitreibung auf der Führungsstange 11 erhöht. Weiterhin ist eine Ausführung denkbar, bei der die wirksame Nockenfläche, also die Rampenbereiche 41 und 42, anstelle an der Nockenfläche 40 an der Unterseite der Nockenstange 39 an deren oberer Fläche angeordnet sind. In diesem Fall wäre der Schlittenträger 43 schwenkbar am oberen Nockenfolgearm 37 gelagert, so dass der Trägerteil 47 nunmehr die Schwenkbewegungen des oberen Nokkenfolgearmes 37 mitmacht. In diesem Fall bestimmt gleichfalls die Druckfeder 58 die Anlagekraft der Elektroden 32, jedoch ist auf einen ausreichenden Abstand zwischen dem oberen Nokkenfolgearm 37 und dem Trägerteil 47 zu achten.In the embodiment shown, the cam follower arms 37 and 38 are rotatably mounted about the pin 52 located in the base plate 44. Instead, they can also be arranged pivotably about the guide rod 11 or about cylindrical guide elements on the base plate 44 concentrically with the guide bore 45. In the previous embodiment, however, the sliding friction on the guide rod 11 would be increased. An embodiment is also conceivable in which the effective Cam surface, that is, the ramp areas 41 and 42, are arranged on the upper surface of the cam rod 39 on the underside of the cam rod 39 instead of on the cam surface 40. In this case, the slide carrier 43 would be pivotably mounted on the upper cam follower arm 37, so that the carrier part 47 now follows the pivoting movements of the upper cam follower arm 37. In this case, the compression spring 58 also determines the contact force of the electrodes 32, but care must be taken to ensure that there is a sufficient distance between the upper cam follower arm 37 and the carrier part 47.

Claims (3)

1. Electrographic printer with a print head carrier (10) movable pivotably and in longitudinal direction on a line-parallel guide bar (11), said carrier being pivotable with the print head (33) out of the latter's lifted-off position under spring pressure (50) into the operating position for being placed against the record carrier, a cam rod (39) controlling the pivoting movement of the print head carrier (10) and being arranged in parallel to the guide rod (11) and having an inclined ramp portion (41, 42) being provided, with a cam follower element (38) connected to the print head carrier (10) being placed against said cam rod and upon the movement of the print head carrier sliding along the inclined ramp and thus pivoting the carrier with the print head (33) out of one position into the other, characterized in that the follower element in the form of a cam follower arm (38) is hinged at the print head carrier (10) or pivotably mounted about the guide rod (11) and pushed against the cam rod (39) by a tension spring (53), that a compression spring (58) is inserted between the cam follower arm (38) and a carrier part (47) fixed to the print head carrier (10), said spring pushing the print head carrier (10) into its operating position up the respective pivoting motion of the cam follower arm (38), and that between the carrier part (47) and the cam follower arm (38) there extends a tie pin (56) with two respective enlarged ends (57), with the two enlarged ends (57) being respectively placed against the outer surface of the carrier part (47) and the cam follower arm (38), respectively, so that upon a corresponding pivoting motion of the cam follower arm (38) the tie pin (56) moves the print head carrier (10) into its lifted-off position.
2. Printer as claimed in claim 1, characterized in that another cam follower arm (37) is hinged at carrier (10) or pivotably mounted about guide rod (11), said arm with its free end co-acting with a ramp-free smooth side of the cam rod (39) which is provided opposite the cam rod side having an inclined ramp portion (41, 42), and that both cam follower arms (37, 38) are interconnected by a tension spring (53) and thus pushed against the cam rod, with the spring force of the tension spring (53) being greater than that of the compression spring (58).
3. Printer as claimed in claim 1 or 2, characterized in that the cam follower arms (37, 38) comprise cam follower rollers (35, 36).
EP82111568A 1981-12-21 1982-12-14 Electrographic printer Expired EP0082462B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US332799 1981-12-21
US06/332,799 US4397576A (en) 1981-12-21 1981-12-21 Print head actuator

Publications (3)

Publication Number Publication Date
EP0082462A2 EP0082462A2 (en) 1983-06-29
EP0082462A3 EP0082462A3 (en) 1985-10-16
EP0082462B1 true EP0082462B1 (en) 1988-10-26

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ID=23299905

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Application Number Title Priority Date Filing Date
EP82111568A Expired EP0082462B1 (en) 1981-12-21 1982-12-14 Electrographic printer

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US (1) US4397576A (en)
EP (1) EP0082462B1 (en)
JP (1) JPS58107384A (en)
CA (1) CA1196815A (en)
DE (1) DE3279151D1 (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4658270A (en) * 1983-07-27 1987-04-14 Sharp Kabushiki Kaisha Recording apparatus
JPH0694225B2 (en) * 1983-10-25 1994-11-24 キヤノン株式会社 Thermal printing equipment
JPH01101178A (en) * 1987-10-14 1989-04-19 Tokyo Electric Co Ltd Thermal transfer printer
US5169247A (en) * 1988-06-02 1992-12-08 Canon Kabushiki Kaisha Thermal printer with biaxial motor feed of the carriage and ribbon
US4874265A (en) * 1988-06-14 1989-10-17 Xerox Corporation Impact mechanism for impact printer
JPH02137967A (en) * 1988-11-18 1990-05-28 Seikosha Co Ltd Serial printer
JPH02145375A (en) * 1988-11-28 1990-06-04 Sony Corp Thermal printer

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2141975A (en) * 1938-03-31 1938-12-27 William G H Finch Multiple stylus facsimile recorder
US3646570A (en) * 1970-02-13 1972-02-29 Scope Inc Printing head mechanism
IT939793B (en) * 1971-09-06 1973-02-10 Olivetti & Co Spa WRITING DEVICE FOR ELECTRONIC CALCULATING MACHINES
US3845850A (en) * 1973-02-22 1974-11-05 Bowmar Instrument Corp Thermal printer
DE2825761C2 (en) * 1978-06-12 1982-05-13 Siemens AG, 1000 Berlin und 8000 München Arrangement for driving a printer carriage in teleprinters or data typewriters
US4343012A (en) * 1980-12-30 1982-08-03 International Business Machines Corporation Printer control circuit

Also Published As

Publication number Publication date
JPS58107384A (en) 1983-06-27
US4397576A (en) 1983-08-09
DE3279151D1 (en) 1988-12-01
CA1196815A (en) 1985-11-19
EP0082462A2 (en) 1983-06-29
EP0082462A3 (en) 1985-10-16

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