EP0332863B1 - Mounting of a print head - Google Patents

Mounting of a print head Download PDF

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Publication number
EP0332863B1
EP0332863B1 EP89102605A EP89102605A EP0332863B1 EP 0332863 B1 EP0332863 B1 EP 0332863B1 EP 89102605 A EP89102605 A EP 89102605A EP 89102605 A EP89102605 A EP 89102605A EP 0332863 B1 EP0332863 B1 EP 0332863B1
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EP
European Patent Office
Prior art keywords
tensioning
print head
arm
bearing
carrier part
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 - Lifetime
Application number
EP89102605A
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German (de)
French (fr)
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EP0332863A3 (en
EP0332863A2 (en
Inventor
Wolfgang Blindow
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wincor Nixdorf International GmbH
Original Assignee
Wincor Nixdorf International GmbH
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Publication date
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Priority to AT89102605T priority Critical patent/ATE76000T1/en
Publication of EP0332863A2 publication Critical patent/EP0332863A2/en
Publication of EP0332863A3 publication Critical patent/EP0332863A3/en
Application granted granted Critical
Publication of EP0332863B1 publication Critical patent/EP0332863B1/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
    • B41J25/34—Bodily-changeable print heads or carriages

Definitions

  • the invention relates to a device for holding a printhead on a printhead carriage of a printer according to the preamble of claim 1.
  • a device of the type mentioned above is known for example from GB-A-2 172 929.
  • a nose is formed on the clamping leg of the clamping lever, which engages behind a bead on the clamping surface of the printhead in the locking position of the clamping lever.
  • a device for holding a printhead in which the printhead carries two pins which by corresponding Reach through openings in a disk-shaped carrier part and each have an annular groove near their free ends.
  • the free ends of the pins which protrude beyond the carrier part engage in holes in a locking disk which are followed by elongated holes in the shape of a circular arc.
  • the edges of the elongated holes engage in the ring grooves of the pin ends, so that the print head is fixed on the carrier part.
  • it is secured to the carrier part via a ratchet catch. This type of locking of the print head on the carrier part is secure, but it requires relatively complicated parts.
  • the invention has for its object to provide a device of the type mentioned, which is simple in construction and inexpensive to manufacture and allows a convenient and quick replacement of the printhead, while still ensuring a secure and precise fit of the printhead on the support member.
  • the correct seating of the printhead on the carrier part is determined by the printhead receptacle and the contact surfaces.
  • the handle limbs of the tensioning levers must be moved parallel to the bearing axis, ie perpendicular to the swivel plane of the tensioning levers via the locking lugs. An unintentional opening of the tensioning lever, for example if the printhead is shaken more strongly, is therefore excluded.
  • the latching means on the carrier part and on the tensioning levers enable simple release and locking of the tensioning levers without the aid of tools.
  • the embodiment according to the invention enables simple mounting of the tensioning levers on the carrier part, no further parts being required.
  • the clamping lever is long enough to allow easy locking even with relatively high clamping forces.
  • the sufficient length of the tensioning levers simultaneously ensures that they are sufficiently elastic to be able to bend them out of engagement with the latching lugs on the carrier part.
  • the carrier part and the tensioning lever can be made of plastic, the choice of a suitable plastic on the one hand ensuring the necessary strength and on the other hand the required elasticity of the tensioning lever.
  • the clamping arm is directed relative to the bearing arm and the handle arm of the respective clamping lever in such a way that it bears against the clamping surface of the printhead under pretension in the locking position of the clamping lever.
  • At least one adjusting element on the carrier part which is intended to engage with a complementary counter element on the printhead.
  • FIG. 1 shows in its upper part a printhead, generally designated 10, with a housing 12 enclosing the actuating magnets for the printing needles and a mouthpiece 14 guiding the printing needles, the view of FIG. 1 looking at the needle outlet end of the mouthpiece 14.
  • an anchoring plate 16 is rigidly connected.
  • a mounting device which can be attached to the printer carriage of a printer and which is intended for exchangeable mounting of the print head 10.
  • the holding device comprises an elongated carrier part 20 with a centrally arranged rectangular recess 22, which extends transversely to the longitudinal direction of the carrier part 20 and is intended for receiving the mouthpiece 14 of the print head 10.
  • two adjusting pins 26 are formed on a contact surface 24 of the carrier part 20 intended for contacting the locking plate 16, which engage in complementary openings 28 in the locking plate 16 in order to ensure a precise fit of the printhead 10 on the carrier part 20.
  • the carrier part 20 each has a storage fork 30 for mounting tensioning levers 32.
  • the bearing fork 30 comprises two legs 33, 34 which delimit a bearing gap 36 into which a bearing leg 38 of the tensioning lever 32 engages.
  • the bearing arm 38 carries a bearing pin 40 which can be inserted into U-shaped bearing slots 42 in the fork legs 32, 34.
  • the straight part of the bearing slots 42 is somewhat narrower than the diameter of the bearing pins, while the bearing surface at the bottom of the bearing slots 42 corresponds exactly to the diameter of the bearing pins 40, so that they can be clipped into the U-shaped slots 42. No further means are therefore required to hold the tensioning levers 32 on the carrier part 20.
  • the bearing leg 38 of the respective clamping lever 32 is extended by a handle leg 44.
  • a handle leg 44 In a central region between the bearing axis and the free end of the handle leg 44, an approximately perpendicular to the longitudinal direction of the bearing leg 38 and the handle leg 44 extends clamping leg 46, the angle ⁇ of the clamping leg 46 with the bearing leg 38 being slightly less than 90 °.
  • detent 50 Arranged in each case on arms 48 directed parallel to the direction of insertion of the print head 10 into the carrier part 20 is a detent 50 which has a ramp-shaped instruction surface 52 which can be seen in FIG.
  • FIG. 3 shows the printhead 10 inserted into the holding device 18 with the tensioning levers 32 still open.
  • the tensioning levers 32 are pivoted in the direction of the arrows C in FIG. 3.
  • the clamping legs 46 come to rest on the upper side of the locking plate 16.
  • the grip legs 44 slide over the inclined instruction surfaces 52 of the lugs 50, the clamping levers 32 being deflected in the direction of the arrow D in FIG. 5 until they snap behind the lugs 50.
  • the clamping leg was braced against the pivoting direction of the arrow C, so that a corresponding holding force acts on the locking plate 16 in order to clamp the print head 10 firmly against the contact surface 24.
  • the locking position of the clamping lever 32 is shown in Figure 4.
  • the cam surface 54 shown in FIG. 1 lies flat on the bearing leg 38 of the respective tensioning lever 32 against the end surface 56 of the gap 36 of the bearing fork 30 and thus forms a stop for tensioning the tensioning lever 32 until the handle leg 44 behind it each latch 50 can snap into place.
  • the entire mounting device consists of three one-piece parts, the two clamping levers being identical. These parts can be manufactured in a simple and inexpensive manner, for example from plastic, and assembled in a simple manner. Locking and unlocking is extraordinary simple, so that a printhead change can be carried out very quickly and easily.

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Abstract

In a device for mounting a print head (10) on the print head carriage of a printer, comprising a support element (20) attached to the print head carriage, the former having a print head seating (22, 24) with bearing surfaces for the print head and clamps (32) for pressing the print head (10) on to the bearing surfaces, the clamps comprise two clamping levers (32) which are mounted on both sides of the print head seating (22, 24) on the support element (20) so as to be able to swivel between a release position and a locked position and each of which features a tensioning member (46) designed to engage behind a clamping surface (16) on the print head (10), where detents (50, 44) are provided on the support element (20) and the clamping levers (32), which engage with one another in the locked position of the clamping levers (32). <IMAGE>

Description

Die Erfindung betrifft eine Vorrichtung zur Halterung eines Druckkopfes an einem Druckkopfschlitten eines Druckers gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a device for holding a printhead on a printhead carriage of a printer according to the preamble of claim 1.

Eine Vorrichtung der vorstehend genannten Art ist beispielsweise aus der GB-A-2 172 929 bekannt. Bei der bekannten Ausführungsform ist an dem Spannschenkel des Spannhebels eine Nase ausgebildet, die in der Verriegelungsstellung des Spannhebels einen Wulst an der Spannfläche des Druckkopfes hintergreift. Bei dieser Lösung kann die Gefahr nicht ausgeschlossen werden, daß bei einer Erschütterung die Nase an dem Spannschenkel des Spannhebels über den Wulst gleitet und der Spannhebel selbsttätig in seine Öffnungslage verschwenkt wird. Eine absolut sichere Verriegelung des Druckkopfes an dem Trägerteil ist damit nicht gewährleistet.A device of the type mentioned above is known for example from GB-A-2 172 929. In the known embodiment, a nose is formed on the clamping leg of the clamping lever, which engages behind a bead on the clamping surface of the printhead in the locking position of the clamping lever. With this solution, the risk that the nose on the clamping leg of the clamping lever slides over the bead and the clamping lever is automatically pivoted into its open position cannot be ruled out. An absolutely secure locking of the print head on the carrier part is not guaranteed.

Denselben Nachteil hat auch eine ähnliche Vorrichtung, die aus Patent Abstracts of Japan, vol. 9, no. 256 (M-421) (1979) bekannt ist, wobei hier die von der Nase am Spannschenkel hintergriffene Fläche an einem Zapfen des Trägerteils ausgebildet ist, der durch eine Öffnung in der Spannfläche des zu spannenden Teiles hindurchgreift.The same disadvantage also has a similar device, which is known from Patent Abstracts of Japan, vol. 9, no. 256 (M-421) (1979) is known, in which case the surface which is gripped by the nose on the clamping leg is formed on a pin of the carrier part which extends through an opening in the clamping surface of the part to be clamped.

Aus der US-A-3 921 780 ist eine Vorrichtung zur Halterung eines Druckkopfes bekannt, bei der der Druckkopf zwei Zapfen trägt, die durch korrespondierende Öffnungen in einem scheibenförmigen Trägerteil hindurchgreifen und nahe ihren freien Enden jeweils eine Ringnut aufweisen. Die über das Trägerteil hinausragenden freien Enden der Zapfen greifen in Löcher einer Verriegelungsscheibe ein, an die sich kreisbogenförmige Langlöcher anschließen. Durch eine Drehung der Verriegelungsscheibe greifen die Ränder der Langlöcher in die Ringnuten der Zapfenenden ein, so daß der Druckkopf an dem Trägerteil festgelegt ist. Um eine unbeabsichtigte Lockerung der Verriegelungsscheibe zu vermeiden, ist diese über ein Rastklinkengesperre an dem Trägerteil gesichert. Diese Art der Verriegelung des Druckkopfes an dem Trägerteil ist zwar sicher, erfordert aber relativ komplizierte Teile.From US-A-3 921 780 a device for holding a printhead is known, in which the printhead carries two pins which by corresponding Reach through openings in a disk-shaped carrier part and each have an annular groove near their free ends. The free ends of the pins which protrude beyond the carrier part engage in holes in a locking disk which are followed by elongated holes in the shape of a circular arc. By rotating the locking disk, the edges of the elongated holes engage in the ring grooves of the pin ends, so that the print head is fixed on the carrier part. In order to avoid inadvertent loosening of the locking disc, it is secured to the carrier part via a ratchet catch. This type of locking of the print head on the carrier part is secure, but it requires relatively complicated parts.

Der Erfindung liegt die Aufgabe zugrunde, eine Vorrichtung der eingangs genannten Art anzugeben, die einfach im Aufbau und preiswert in der Herstellung ist sowie ein bequemes und schnelles Auswechseln des Druckkopfes erlaubt, wobei dennoch ein sicherer und präziser Sitz des Druckkopfes an dem Trägerteil gewährleistet ist.The invention has for its object to provide a device of the type mentioned, which is simple in construction and inexpensive to manufacture and allows a convenient and quick replacement of the printhead, while still ensuring a secure and precise fit of the printhead on the support member.

Diese Aufgabe wird erfindungsgemäß durch die im kennzeichnenden Teil des Anspruchs 1 angegebenen Merkmale gelöst.This object is achieved by the features specified in the characterizing part of claim 1.

Der korrekte Sitz des Druckkopfes an dem Trägerteil wird durch die Druckkopfaufnahme und die Anlageflächen bestimmt. Zum Verriegeln und Entriegeln der Spannhebel müssen die Griffschenkel der Spannhebel parallel zur Lagerachse, d.h. senkrecht zur Schwenkebene der Spannhebel über die Rastnasen bewegt werden. Ein unbeabsichtigtes Öffnen der Spannhebel z.B. bei einer stärkeren Erschütterung des Druckkopfes ist damit ausgeschlossen.The correct seating of the printhead on the carrier part is determined by the printhead receptacle and the contact surfaces. To lock and unlock the tensioning levers, the handle limbs of the tensioning levers must be moved parallel to the bearing axis, ie perpendicular to the swivel plane of the tensioning levers via the locking lugs. An unintentional opening of the tensioning lever, for example if the printhead is shaken more strongly, is therefore excluded.

Gleichzeitig ermöglichen die Rastmittel an dem Trägerteil und an den Spannhebeln ein einfaches Lösen und Verriegeln der Spannhebel ohne Hilfe von Werkzeugen. Die erfindungsgemäße Ausführungsform ermöglicht eine einfache Montage der Spannhebel an den Trägerteil, wobei keine weiteren Teile benötigt werden. Der Spannhebel ist lang genug, um auch bei relativ hohen Spannkräften ein bequemes Verriegeln zu ermöglichen. Die ausreichende Länge der Spannhebel gewährleistet gleichzeitig eine ausreichende Elastizität derselben, um sie aus dem Eingriff mit den Rastnasen an dem Trägerteil biegen zu können.At the same time, the latching means on the carrier part and on the tensioning levers enable simple release and locking of the tensioning levers without the aid of tools. The embodiment according to the invention enables simple mounting of the tensioning levers on the carrier part, no further parts being required. The clamping lever is long enough to allow easy locking even with relatively high clamping forces. The sufficient length of the tensioning levers simultaneously ensures that they are sufficiently elastic to be able to bend them out of engagement with the latching lugs on the carrier part.

Das Trägerteil und die Spannhebel können aus Kunststoff hergestellt werden, wobei die Wahl eines geeigneten Kunststoffes einerseits die nötige Festigkeit und andererseits die erforderliche Elastizität der Spannhebel gewährleistet.The carrier part and the tensioning lever can be made of plastic, the choice of a suitable plastic on the one hand ensuring the necessary strength and on the other hand the required elasticity of the tensioning lever.

Um eine ausreichende Spannkraft aufbringen zu können, ist es zweckmäßig, wenn der Spannschenkel relativ zu dem Lagerschenkel und dem Griffschenkel des jeweiligen Spannhebels so gerichtet ist, daß er in der Verriegelungsstellung des Spannhebels unter Vorspannung an der Spannfläche des Druckkopfes anliegt.In order to be able to apply a sufficient clamping force, it is expedient if the clamping arm is directed relative to the bearing arm and the handle arm of the respective clamping lever in such a way that it bears against the clamping surface of the printhead under pretension in the locking position of the clamping lever.

Um eine präzise Ausrichtung des Druckkopfes an dem Trägerteil zu erleichtern, kann es zweckmäßig sein, an dem Trägerteil mindestens ein Justierelement vorzusehen, das zum Eingriff mit einem komplementären Gegenelement am Druckkopf bestimmt ist.In order to facilitate precise alignment of the printhead on the carrier part, it can be expedient to provide at least one adjusting element on the carrier part which is intended to engage with a complementary counter element on the printhead.

Vorteilhafte Ausführungen der Erfindung ergeben sich auch aus den weiteren Unteransprüchen.Advantageous embodiments of the invention also result from the further subclaims.

Die folgende Beschreibung erläutert in Verbindung mit den beigefügten Zeichnungen die Erfindung anhand eines Ausführungsbeispieles. Es zeigen:

  • Fig. 1 eine schematische Darstellung des Druckkopfes und der zu seiner Halterung an einem Druckerschlitten bestimmten Halterungsvorrichtung,
  • Fig. 2 eine Draufsicht auf das Trägerteil der in der Figur 1 dargestellten Halterungsvorrichtung in Richtung des Pfeiles A.
  • Fig. 3 eine schematische Darstellung der Halterungsvorrichung mit eingesetztem Druckkopf und geöffneten Spannhebeln,
  • Fig. 4 eine Darstellung gemäß Figur 3 mit geschlossenen Spannhebeln und
  • Fig. 5 eine schematische Draufsicht auf die in der Figur 4 dargestellte Anordnung in Richtung des Pfeiles B.
The following description in conjunction with the accompanying drawings explains the invention using an exemplary embodiment. Show it:
  • 1 is a schematic representation of the print head and the mounting device intended for mounting it on a printer carriage,
  • 2 shows a plan view of the carrier part of the mounting device shown in FIG. 1 in the direction of arrow A.
  • 3 shows a schematic representation of the mounting device with the printhead inserted and the tension levers open,
  • Fig. 4 is an illustration according to Figure 3 with closed clamping levers and
  • 5 shows a schematic top view of the arrangement shown in FIG. 4 in the direction of arrow B.

Figur 1 zeigt in ihrem oberen Teil einen allgemein mit 10 bezeichneten Druckkopf mit einem die Betätigungsmagnete für die Drucknadeln einschließenden Gehäuse 12 und einem die Drucknadeln führenden Mundstück 14, wobei man in der Darstellung der Figur 1 auf das Nadelaustrittsende des Mundstücks 14 blickt. Mit dem Mundstück 14 und dem Gehäuse 12 ist eine Verankerungsplatte 16 starr verbunden.FIG. 1 shows in its upper part a printhead, generally designated 10, with a housing 12 enclosing the actuating magnets for the printing needles and a mouthpiece 14 guiding the printing needles, the view of FIG. 1 looking at the needle outlet end of the mouthpiece 14. With the mouthpiece 14 and the housing 12, an anchoring plate 16 is rigidly connected.

Im unteren Abschnitt der Figur 1 ist eine allgemein mit 18 bezeichnete Halterungsvorrichtung dargestellt, die an dem Druckerschlitten eines Druckers befestigt werden kann und die zur auswechselbaren Halterung des Druckkopfes 10 bestimmt ist. Die Halterungsvorrichtung umfaßt ein längliches Trägerteil 20 mit einer mittig angeordneten sich quer zur Längsrichtung des Trägerteils 20 erstreckenden rechteckigen Aussparung 22, die zur Aufnahme des Mundstücks 14 des Druckkopfes 10 bestimmt ist. Beiderseits dieser Aussparung 22 sind an einer zur Anlage der Verriegelungsplatte 16 bestimmten Anlagefläche 24 des Trägerteils 20 zwei Justierzapfen 26 ausgebildet, die in komplementäre Durchbrechungen 28 in der Verriegelungsplatte 16 eingreifen, um so einen präzisen Sitz des Druckkopfes 10 an dem Trägerteil 20 zu gewährleisten.In the lower section of FIG. 1, a mounting device, generally designated 18, is shown, which can be attached to the printer carriage of a printer and which is intended for exchangeable mounting of the print head 10. The holding device comprises an elongated carrier part 20 with a centrally arranged rectangular recess 22, which extends transversely to the longitudinal direction of the carrier part 20 and is intended for receiving the mouthpiece 14 of the print head 10. On both sides of this recess 22, two adjusting pins 26 are formed on a contact surface 24 of the carrier part 20 intended for contacting the locking plate 16, which engage in complementary openings 28 in the locking plate 16 in order to ensure a precise fit of the printhead 10 on the carrier part 20.

An seinen beiden Längsenden weist das Trägerteil 20 jeweils eine Lagergabel 30 zur Lagerung von Spannhebeln 32 auf. Die Lagergabel 30 umfaßt zwei Schenkel 33, 34, die einen Lagerspalt 36 begrenzen, in den ein Lagerschenkel 38 des Spannhebels 32 eingreift. Der Lagerschenkel 38 trägt einen Lagerzapfen 40, der in U-förmige Lagerschlitze 42 in den Gabelschenkeln 32, 34 einführbar ist. Dabei ist der gerade Teil der Lagerschlitze 42 etwas schmaler als der Durchmesser der Lagerzapfen, während die Lagerfläche am Grunde der Lagerschlitze 42 dem Durchmesser der Lagerzapfen 40 exakt entspricht, so daß diese in die U-förmigen Schlitze 42 eingeklipst werden können. Es werden daher keine weiteren Mittel benötigt, um die Spannhebel 32 an dem Trägerteil 20 festzuhalten.At its two longitudinal ends, the carrier part 20 each has a storage fork 30 for mounting tensioning levers 32. The bearing fork 30 comprises two legs 33, 34 which delimit a bearing gap 36 into which a bearing leg 38 of the tensioning lever 32 engages. The bearing arm 38 carries a bearing pin 40 which can be inserted into U-shaped bearing slots 42 in the fork legs 32, 34. The straight part of the bearing slots 42 is somewhat narrower than the diameter of the bearing pins, while the bearing surface at the bottom of the bearing slots 42 corresponds exactly to the diameter of the bearing pins 40, so that they can be clipped into the U-shaped slots 42. No further means are therefore required to hold the tensioning levers 32 on the carrier part 20.

Der Lagerschenkel 38 des jeweiligen Spannhebels 32 ist durch einen Griffschenkel 44 verlängert. In einem mittleren Bereich zwischen der Lagerachse und dem freien Ende des Griffschenkels 44 setzt ein annähernd senkrecht zur Längsrichtung von Lagerschenkel 38 und Griffschenkel 44 verlaufender Spannschenkel 46 an, wobei der Winkel α des Spannschenkels 46 mit dem Lagerschenkel 38 etwas geringer als 90° ist.The bearing leg 38 of the respective clamping lever 32 is extended by a handle leg 44. In a central region between the bearing axis and the free end of the handle leg 44, an approximately perpendicular to the longitudinal direction of the bearing leg 38 and the handle leg 44 extends clamping leg 46, the angle α of the clamping leg 46 with the bearing leg 38 being slightly less than 90 °.

An parallel zur Einsetzrichtung des Druckkopfes 10 in das Trägerteil 20 gerichteten Armen 48 ist jeweils eine Rastnase 50 angeordnet, die eine in der Figur 2 zu erkennende rampenförmige Einweisungsfläche 52 aufweist.Arranged in each case on arms 48 directed parallel to the direction of insertion of the print head 10 into the carrier part 20 is a detent 50 which has a ramp-shaped instruction surface 52 which can be seen in FIG.

Figur 3 zeigt den in die Halterungsvorrichtung 18 eingesetzten Druckkopf 10 bei noch geöffneten Spannhebeln 32. Zum Verriegeln des Druckkopfes 10 in der Halterungsvorrichtung 18 werden die Spannhebel 32 in Richtung der Pfeile C in Figur 3 verschwenkt. Dabei kommen zunächst die Spannschenkel 46 auf der Oberseite der Verriegelungsplatte 16 zur Anlage. Gleichzeitig gleiten die Griffschenkel 44 über die schrägen Einweisungsflächen 52 der Nasen 50, wobei die Spannhebel 32 in Richtung des Pfeiles D in Figur 5 ausgelenkt werden, bis sie hinter den Nasen 50 einschnappen. Dabei wurde der Spannschenkel jeweils entgegen der Schwenkrichtung des Pfeiles C verspannt, so daß eine entsprechende Haltekraft auf die Verriegelungsplatte 16 einwirkt, um den Druckkopf 10 fest gegen die Anlagefläche 24 zu spannen. Die Verriegelungsstellung der Spannhebel 32 ist in Figur 4 dargestellt. In der Verriegelungsstellung liegt die in der Figur 1 erkennbare Nockenfläche 54 an dem Lagerschenkel 38 des jeweiligen Spannhebels 32 flach an der Endfläche 56 des Spaltes 36 der Lagergabel 30 an und bildet somit einen Anschlag für das Verspannen des Spannhebels 32, bis dessen Griffschenkel 44 hinter der jeweiligen Rastnase 50 einrasten kann.FIG. 3 shows the printhead 10 inserted into the holding device 18 with the tensioning levers 32 still open. For locking the printhead 10 in the holding device 18, the tensioning levers 32 are pivoted in the direction of the arrows C in FIG. 3. First, the clamping legs 46 come to rest on the upper side of the locking plate 16. At the same time, the grip legs 44 slide over the inclined instruction surfaces 52 of the lugs 50, the clamping levers 32 being deflected in the direction of the arrow D in FIG. 5 until they snap behind the lugs 50. The clamping leg was braced against the pivoting direction of the arrow C, so that a corresponding holding force acts on the locking plate 16 in order to clamp the print head 10 firmly against the contact surface 24. The locking position of the clamping lever 32 is shown in Figure 4. In the locked position, the cam surface 54 shown in FIG. 1 lies flat on the bearing leg 38 of the respective tensioning lever 32 against the end surface 56 of the gap 36 of the bearing fork 30 and thus forms a stop for tensioning the tensioning lever 32 until the handle leg 44 behind it each latch 50 can snap into place.

Zum Lösen der Spannhebel 32 müssen diese wiederum aus der in der Figur 4 dargestellten Verriegelungsstellung in Richtung des Pfeiles D in Figur 5 ausgelenkt und über die Rastnasen 50 angehoben werden, bis sie entgegen der Richtung der Pfeiles C in ihre in den Figuren 1 und 3 dargestellte Freigabestellung verschwenkt werden können.To release the tensioning levers 32, these in turn have to be deflected from the locking position shown in FIG. 4 in the direction of arrow D in FIG. 5 and raised over the latching lugs 50 until they move in the direction shown by arrows C in FIGS. 1 and 3 Release position can be pivoted.

Wie die vorstehende Beschreibung zeigt, besteht die gesamte Halterungsvorrichtung aus drei jeweils einstückigen Teilen, wobei die beiden Spannhebel identisch sind. Diese Teile können auf einfache und preiswerte Weise beispielsweise aus Kunststoff gefertigt und auf einfache Weise montiert werden. Das Verriegeln und Entriegeln ist außerordentlich einfach, so daß ein Druckkopfwechsel sehr rasch und bequem durchgeführt werden kann.As the above description shows, the entire mounting device consists of three one-piece parts, the two clamping levers being identical. These parts can be manufactured in a simple and inexpensive manner, for example from plastic, and assembled in a simple manner. Locking and unlocking is extraordinary simple, so that a printhead change can be carried out very quickly and easily.

Claims (6)

1. A method of mounting a print head (10) on the print head carriage of a printer, comprising a carrier part (20) having a pring head holder (22, 24) comprising a abutment surfaces for the print head (10), and tensioning means (32) for pressing the print head (10) against the abutment surfaces, the tensioning means comprising two tensioning levers (32) mounted on both sides of the print head holder (22, 24) on the carrier part (20) for pivoting between a release position and a locking position and each comprising a tensioning arm (46) intended to engage behind a tentioning surface (16) on the print head (10), characterised in that the tensioning levers (32) are each mounted pivotally, by a bearing arm (38) forming an angle with the tensioning arm (46), in a bearing fork (30) of the carrier part (20) securable on the print head carriage, the bearing arm (38) carrying a bearing pin adapted to clip a U-shaped bearing slot (42) in the carrier part (20), and in that a nose (50) provided with ramp surfaces (52) is formed on each arm (48) connected to the carrier part (20), said nose extending parallel to the bearing spindle (40) into the pivoting path of the tensioning lever (32) and its distance from the bearing spindle (40) of the associated tensioning lever (32) being greater than the distance between the tensioning arm (46) and the bearing spindle (40), the tensioning lever (32) comprising a grip arm (44) which continues the bearing arm (38) beyond the tensioning arm (46) and which, in the locking position of the associated tensioning lever (32), engages behind the associated nose (50).
2. Apparatus according to claim 1, characterised in thats the tensioning arm (46) is so oriented relatively to the bearing arm (38) and the grip arm (44) of the associated tensioning lever (32) that in the locking position of the tensioning lever (32) it bears against the tensioning surface (16) of the print head (10) with prestressing.
3. Apparatus according to claim 1 or 2, characterised in that the tensioning levers (32) are made in one piece from a material which is at least slightly elastically deformable.
4. Apparatus according to any one of claims 1 to 3, characterised in that a cam surface (54) is formed on the bearing arm (38) of the associated tensioning lever (32) and in the locking position bears against an abutment surface of the bearing fork of the carrier part.
5. Apparatus according to any one of claims 1 to 4, characterised in that at least one adjustment element (26) is formed on the carrier part (20) and is intended to engage a companion element (28) on the print head (10).
6. Apparatus according to any of claims 1 to 5, characterised in that the tensioning levers (32) are identically shaped.
EP89102605A 1988-03-15 1989-02-15 Mounting of a print head Expired - Lifetime EP0332863B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89102605T ATE76000T1 (en) 1988-03-15 1989-02-15 DEVICE FOR HOLDING A PRINT HEAD.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3808648 1988-03-15
DE3808648A DE3808648C1 (en) 1988-03-15 1988-03-15

Publications (3)

Publication Number Publication Date
EP0332863A2 EP0332863A2 (en) 1989-09-20
EP0332863A3 EP0332863A3 (en) 1990-01-17
EP0332863B1 true EP0332863B1 (en) 1992-05-13

Family

ID=6349795

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89102605A Expired - Lifetime EP0332863B1 (en) 1988-03-15 1989-02-15 Mounting of a print head

Country Status (3)

Country Link
EP (1) EP0332863B1 (en)
AT (1) ATE76000T1 (en)
DE (1) DE3808648C1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0418821B1 (en) * 1989-09-18 1997-12-29 Canon Kabushiki Kaisha Ink jet recording head carriage and an apparatus with same
EP0602709B1 (en) * 1992-12-14 1998-04-29 Agfa-Gevaert N.V. Thermal image-recording apparatus with locking means for holding a print head

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1050504B (en) * 1974-05-10 1981-03-10 Olivetti C E C S P A DEVICE FOR PUSITIONING AND LOCKING OF AN ELECTROTHERMAL HEAD
US3921780A (en) * 1974-07-18 1975-11-25 Gen Electric Assembly for mounting a print head
JPS58104781A (en) * 1981-12-16 1983-06-22 Tokyo Electric Co Ltd Printer
JPS60105569A (en) * 1983-11-14 1985-06-11 Tokyo Electric Co Ltd Printing head retaining mechanism for printing device
JPH0632968B2 (en) * 1985-03-26 1994-05-02 セイコーエプソン株式会社 Printhead attachment mechanism

Also Published As

Publication number Publication date
ATE76000T1 (en) 1992-05-15
DE3808648C1 (en) 1989-04-27
EP0332863A3 (en) 1990-01-17
EP0332863A2 (en) 1989-09-20

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