EP0224737B1 - Printer, especially a matrix printer with impacting printing elements - Google Patents

Printer, especially a matrix printer with impacting printing elements Download PDF

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Publication number
EP0224737B1
EP0224737B1 EP86115257A EP86115257A EP0224737B1 EP 0224737 B1 EP0224737 B1 EP 0224737B1 EP 86115257 A EP86115257 A EP 86115257A EP 86115257 A EP86115257 A EP 86115257A EP 0224737 B1 EP0224737 B1 EP 0224737B1
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EP
European Patent Office
Prior art keywords
printer
housing
frame
printer frame
feet
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
EP86115257A
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German (de)
French (fr)
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EP0224737A1 (en
Inventor
Ulrich Dipl.-Ing. Buschmann
Günter Dipl.-Ing. Gomoll
Wolfgang Dipl.-Ing. Hauslaib
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.)
Vodafone GmbH
Original Assignee
Mannesmann AG
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Filing date
Publication date
Application filed by Mannesmann AG filed Critical Mannesmann AG
Priority to AT86115257T priority Critical patent/ATE43295T1/en
Publication of EP0224737A1 publication Critical patent/EP0224737A1/en
Application granted granted Critical
Publication of EP0224737B1 publication Critical patent/EP0224737B1/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
    • B41J29/00—Details of, or accessories for, typewriters or selective printing mechanisms not otherwise provided for
    • B41J29/10—Sound-deadening devices embodied in machines

Definitions

  • the invention relates to a printer, in particular a matrix printer with striking printing elements, furthermore with a printing mechanism arranged in a noise-reduced printer housing, the moving components of which generate noise, the printing mechanism being fastened to a printer frame and the printer being supported on a footprint by means of several device feet (US -A 4 215 762).
  • Such printers are from cash registers, banks, booking offices, travel companies and the like. in the form of receipt printers, receipt encoders, ticket printers and the like. known and recognizable by their sawing noises. In the event that the printers are located near office workplaces, a noise level of approx. 55 dB (A) must not be exceeded in order not to impair the ability to concentrate.
  • the causes of noise in such printers are vibrations caused by the striking printing elements, the moving components of the print mechanics, e.g. caused by the print head carriage, inside the printer.
  • a printer can also stimulate its footprint and thereby increase the printing noise.
  • the natural frequency of the printer, its printer frame, the print mechanics and other components also occurs as an essential source of noise.
  • the vibrations generated are conducted as structure-borne noise into the floor space and the printer housing or emitted as airborne noise.
  • a printer is screwed between the printer housing and the printer frame and the entire unit is placed on the footprint using rubber feet.
  • the invention is based on the object of reducing the noise emission from printers working with striking printing elements, to be precise down to values below 50 dB (A).
  • the object is achieved according to the invention in that the printer frame supporting the printing mechanism with the striking printing elements is supported directly on the footprint by means of the device feet, that the device feet penetrate the printer housing in each case without contact through housing openings, and that an insulation element is provided within several connections of the printer frame and printer housing is provided.
  • This keeps the printer housing free of structure-borne noise, so it does not excite itself and therefore no longer emits airborne noise.
  • the result is a noise level below 50 dB (A).
  • a single-mass oscillator is formed by the connection of the printer frame / printer housing, so that the resonance frequency of the spring-mass system can be determined via the known laws and adjusted so that as little structure-borne noise energy as possible is introduced into the footprint.
  • the insulation element can be designed as a very soft connection between the printer frame and the printer housing, as a result of which the tuning frequency is kept very low, which leads to very good structure-borne noise insulation.
  • the suspension according to the invention can be designed according to further features such that the connection of the printer frame and printer housing is formed in each case by an attachment pin provided on the printer frame, an insulating sleeve surrounding this, attached to the printer frame and a locking cap placed on the attachment pin.
  • the printer frame with all components can be easily dismantled and reassembled, which is very important for the maintenance of the printer.
  • fastening pin is integrally formed on the printer housing, is hollow on the inside and forms spreading arms.
  • Another advantage of the invention is that the insulating element is fastened in a round opening on the printer frame by means of an external groove.
  • the invention therefore only requires simple, inexpensive manufacturing processes for its implementation.
  • a removable upper housing part is sealed at the separating joint from a lower housing part by means of a circumferential sealing cord.
  • Every printer has unavoidable openings for the paper guide and cooling air. It is nevertheless advantageous if a printer housing provided with cooling air slots on the underside is provided with a sound apron which runs around at least on three sides and extends downwards.
  • the printer shown in FIG. 1 is, for example, a matrix printer with a needle print head (not shown) which is moved back and forth in front of a recording medium during writing.
  • a printing mechanism 2 is arranged, which essentially consists of a paper guide, paper transport device, print head guide, print head drive and the like (not shown in each case). consists.
  • Such a printer housing 1 is soundproof to a limited extent.
  • the printing mechanism 2 is fastened to a metallic printer frame 3, which essentially consists of two side parts 3a and a bottom part 3b.
  • the printer housing 1 is not based on a footprint 4.
  • the bottom part 3b of the printer frame 3 is provided with device feet 5 which are made of elastic materials, such as e.g. Rubber, are made and rely directly on the footprint 4.
  • the weight of the printer therefore rests on three to four such device feet 5. The latter protrude through housing openings 1c without touching the printer housing 1.
  • the printer housing 1 is suspended "floating" on the bottom part 3b, as follows:
  • the printer frame 3 has connections 6 between the printer housing 1 (or the lower housing part 1b) and the printer frame 3 at a short distance from the device feet 5, one of which such connection 6 contains an insulating element 7 in the supporting force flow.
  • the insulation element 7 can be selected to be very soft, as a result of which extremely advantageous structure-borne sound insulation is achieved.
  • connection 6 consists of a fastening pin 8 injection molded together with the lower housing part 1b from plastic, the insulating element 7 being formed from an insulating sleeve 9 made of elastic material.
  • a locking cap 10 is arranged on the fastening pin 8.
  • the fastening pin 8 is molded onto the lower housing part 1, is hollow on the inside (cavity 11) and forms spreading arms 12 by slots 13 being incorporated radially (FIG. 3b).
  • a resilient effect of the spreading arms 12 is reinforced by a cross-sectional shoulder 14.
  • a detent 16 is provided at each tip 15. All locking lugs 16 are gripped by the locking cap 10.
  • the locking cap 10 has a shaped opening 17 (FIG. 3a).
  • a radially larger insertion opening 17a is assigned to each of the three spreading arms 12 present.
  • the catch 16 is gripped by turning through radially narrower sections 17b so that it is axially locked and the printer housing 1 (or the lower housing part 1b) is resiliently connected to the bottom part 3b of the printer frame 3.
  • the printer housing 1 is composed of the upper housing part 1 a and the lower housing part 1.
  • a joint 20 runs between the two.
  • a sealing cord 21 is laid within the joint 20, so that sound waves cannot penetrate outside of the printer housing 1.
  • the printer housing 1 (or the lower housing part 1b) has a lower paper opening 22 for the paper feed and an upper paper opening 23 for the paper take-off. During the paper flow, sound waves will inevitably leave the printer housing 1 at the openings 22 and 23.
  • cooling air slots 24 in the lower housing part 1b for cooling the electrical devices located in the printer housing 1, e.g. Motors, switching parts, printed circuit boards and the like.
  • the sound emerging from the lower housing part 1 is insulated by a sound apron 25 which runs around at least on three sides and extends downwards in the direction of the shelf 4.
  • the total sound insulation of the printer housing 1 to be achieved with the sound insulation measures according to the invention is approximately 16 dB (A) or more.

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  • Accessory Devices And Overall Control Thereof (AREA)
  • Impact Printers (AREA)

Abstract

Sound attenuation for a printer which includes impacting print elements and other movable noise producing parts being mounted to a frame and further including a biparted housing; the frame bottom having downwardly extending feet by means of which the printer rests on a support surface; the housing envelops the frame and is provided with openings through which the feet project without touching the print housing; the housing is floatingly suspended on said frame through a plurality of connections each of which includes pins integral with the frame and being circumscribed by an attenuating sleeve which is being connected to the frame by a locking cap seated on the respective pin for holding down the sleeve.

Description

Die Erfindung betrifft einen Drucker, insbesondere einen Matrixdrucker mit schlagenden Druckelementen, außerdem mit einer in einem schallreduzierten Druckergehäuse angeordneten Druckmechanik, deren bewegte Bauteile Geräusche erzeugen, wobei die Druckmechanik an einem Druckerrahmen befestigt ist und der Drucker mittels mehrerer Gerätefüße auf einer Stellfläche aufgestützt ist (US-A 4 215 762).The invention relates to a printer, in particular a matrix printer with striking printing elements, furthermore with a printing mechanism arranged in a noise-reduced printer housing, the moving components of which generate noise, the printing mechanism being fastened to a printer frame and the printer being supported on a footprint by means of several device feet (US -A 4 215 762).

Derartige Drucker sind von Zahlkassen, Banken, Buchungsbüros, von Reiseunternehmen u.dgl. in Form von Kassenbelegdruckern, Belegcodierern, Ticketdruckern u.dgl. bekannt und an ihren sägenden Geräuschen erkennbar. Für den Fall, daß die Drucker in der Nähe von Büroarbeitsplätzen angeordnet sind, darf ein Geräuschpegel von ca. 55 dB (A) nicht überschritten werden, um die geistige Konzentrationsfähigkeit nicht zu beeinträchtigen.Such printers are from cash registers, banks, booking offices, travel companies and the like. in the form of receipt printers, receipt encoders, ticket printers and the like. known and recognizable by their sawing noises. In the event that the printers are located near office workplaces, a noise level of approx. 55 dB (A) must not be exceeded in order not to impair the ability to concentrate.

Die Ursachen der Geräuschentwicklung bei solchen Druckern sind Schwingungen, die durch die schlagenden Druckelemente, die bewegten Bauteile der Druckmechanik, wie z.B. durch den Druckkopfschlitten, im Inneren des Druckers entstehen. Je nach Gestaltung der Umgebung kann ein Drucker seine Stellfläche mit anregen und dadurch das Druckgeräusch noch erhöhen. Als wesentliche Geräuschquelle tritt außerdem die Eigenfrequenz des Druckers, seines Druckerrahmens, der Druckmechanik und anderer Bauteile auf. Die erzeugten Schwingungen werden hierbei als Körperschall bis in die Stellfläche und das Druckergehäuse geleitet oder als Luftschall abgestrahlt.The causes of noise in such printers are vibrations caused by the striking printing elements, the moving components of the print mechanics, e.g. caused by the print head carriage, inside the printer. Depending on the design of the environment, a printer can also stimulate its footprint and thereby increase the printing noise. The natural frequency of the printer, its printer frame, the print mechanics and other components also occurs as an essential source of noise. The vibrations generated are conducted as structure-borne noise into the floor space and the printer housing or emitted as airborne noise.

Üblicherweise wird ein Drucker zwischen Druckergehäuse und Druckerrahmen verschraubt und die gesamte Einheit über aus Gummi gefertigte Gerätefüße auf die Stellfläche gestellt.Usually, a printer is screwed between the printer housing and the printer frame and the entire unit is placed on the footprint using rubber feet.

Der Erfindung liegt die Aufgabe zugrunde, die Schallemission aus mit schlagenden Druckelementen arbeitenden Druckern zu vermindern, und zwar bis zu Werten unter 50 dB (A)..The invention is based on the object of reducing the noise emission from printers working with striking printing elements, to be precise down to values below 50 dB (A).

Die gestellte Aufgabe wird erfindungsgemäß dadurch gelöst, daß der die Druckmechanik mit den schlagenden Druckelementen tragende Druckerrahmen mittels der Gerätefüße unmittelbar auf der Stellfläche abgestüzt ist, daß die Gerätefüße das Druckergehäuse jeweils durch Gehäuseöffnungen berührungsfrei durchdringen und daß jeweils innerhalb mehrere Verbindungen von Druckerrahmen und Druckergehäuse ein Dämmelement vorgesehen ist. Damit wird das Druckergehäuse von Körperschall freigehalten, es erregt sich also nicht selbst und strahlt deshalb auch keinen Luftschall mehr ab. Das Ergebnis ist ein unter 50 dB (A) liegender Geräuschpegel.The object is achieved according to the invention in that the printer frame supporting the printing mechanism with the striking printing elements is supported directly on the footprint by means of the device feet, that the device feet penetrate the printer housing in each case without contact through housing openings, and that an insulation element is provided within several connections of the printer frame and printer housing is provided. This keeps the printer housing free of structure-borne noise, so it does not excite itself and therefore no longer emits airborne noise. The result is a noise level below 50 dB (A).

Durch die Verbindung Druckerrahmen/Druckergehäuse wird ein Einmassenschwinger gebildet, so daß über die bekannten Gesetzmäßigkeiten die Resonanzfrequenz des Feder-Masse-Systems bestimmt und so abgestimmt werden kann, daß möglichst wenig Körperschallenergie in die Stellfläche eingeleitet wird. Das Dämmelement kann als eine sehr weiche Verbindung des Druckerrahmens und des Druckergehäuses ausgestaltet werden, wodurch die Abstimmfrequenz sehr niedrig gehalten wird, was zu einer sehr guten Körperschalldämmung führt.A single-mass oscillator is formed by the connection of the printer frame / printer housing, so that the resonance frequency of the spring-mass system can be determined via the known laws and adjusted so that as little structure-borne noise energy as possible is introduced into the footprint. The insulation element can be designed as a very soft connection between the printer frame and the printer housing, as a result of which the tuning frequency is kept very low, which leads to very good structure-borne noise insulation.

Die erfindungsgemäße Aufhängung kann nach weiteren Merkmalen derart gestaltet sein, daß die Verbindung von Druckerrahmen und Druckergehäuse durch jeweils einen am Druckerrahmen vorgesehenen Bestigungszapfen, eine diesen umgebende, am Druckerrahmen befestigte Dämmhülse und eine auf den Befestigungszapfen aufgesetzte Verriegelungskappe gebildet ist. Trotz der schwimmenden Aufhängung kann der Druckerrahmen mit allen Bauteilen leicht demontiert und wieder montiert werden, was für die Wartung des Druckers von großer Bedeutung ist.The suspension according to the invention can be designed according to further features such that the connection of the printer frame and printer housing is formed in each case by an attachment pin provided on the printer frame, an insulating sleeve surrounding this, attached to the printer frame and a locking cap placed on the attachment pin. Despite the floating suspension, the printer frame with all components can be easily dismantled and reassembled, which is very important for the maintenance of the printer.

Eine weitere Verbesserung der Erfindung besteht darin, daß der Befestigungszapfen am Druckergehäuse einstückig angeformt ist, innen hohl ist und Spreizarme bildet.Another improvement of the invention is that the fastening pin is integrally formed on the printer housing, is hollow on the inside and forms spreading arms.

Ein weiterer Vorteil der Erfindung ist dadurch gegeben, daß das Dämmelement mittels einer außen umlaufenden Nute in einer runden Öffnung am Druckerrahmen befestigt ist. Die Erfindung benötigt daher zu ihrer Ausführung nur einfache, kostengünstige Herstellverfahren.Another advantage of the invention is that the insulating element is fastened in a round opening on the printer frame by means of an external groove. The invention therefore only requires simple, inexpensive manufacturing processes for its implementation.

Nach einem anderen Gedanken der Erfindung ist vorgesehen, daß ein abnehmbares-Gehäuseoberteil an der Trennungsfuge gegenüber einem Gehäuseunterteil mittels einer umlaufenden Dichtschnur abgedichtet ist. Diese Maßnahme gewährleistet ein dichtes Druckergehäuse, womit ebenfalls eine Geräuschabkapselung stattfindet und gleicht außerdem Herstellungenauigkeiten von Gehäuseoberteil und Gehäuseunterteil aus.According to another concept of the invention, it is provided that a removable upper housing part is sealed at the separating joint from a lower housing part by means of a circumferential sealing cord. This measure ensures a tight printer housing, which also causes noise isolation and also compensates for manufacturing inaccuracies of the upper housing part and lower housing part.

Jeder Drucker weist unvermeidbare Öffnungen für die Papierführung und für Kühlluft auf. Es ist trotzdem vorteilhaft, wenn ein an der Unterseite mit Kühlluftschlitzen versehenes Druckergehäuse mit einer zumindest an drei Seiten umlaufenden, sich nach unten erstreckenden Schallschürze versehen ist.Every printer has unavoidable openings for the paper guide and cooling air. It is nevertheless advantageous if a printer housing provided with cooling air slots on the underside is provided with a sound apron which runs around at least on three sides and extends downwards.

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird im folgenden näher beschrieben. Es zeigen:

  • Fig. 1 einen senkrechten Querschnitt durch einen Matrixdrucker, wobei die Druckmechanik nicht gezeichnet ist,
  • Fig. 2 einen Teilquerschnitt der Abdichtung zwischen Gehäuseober- und -Unterteil als Einzelheit A gemäß Fig. 1 in vergrößertem Maßstab,
  • Fig. 3 einen im Maßstab ebenfalls vergrößerten Querschnitt durch die Verbindung von Druckerrahmen und Druckergehäuse,
  • Fig. 3a eine Ansicht in Pfeilrichtung A der Verriegelungskappe gegen die Unterseite und
  • Fig. 3b einen horizontalen Schnitt B - C durch die Verriegelungskappe von oben gesehen.
An embodiment of the invention is shown in the drawing and will be described in more detail below. Show it:
  • 1 shows a vertical cross section through a matrix printer, the printing mechanism not being shown,
  • 2 shows a partial cross section of the seal between the upper and lower housing parts as detail A according to FIG. 1 on an enlarged scale,
  • 3 shows a cross section, also enlarged on a scale, through the connection of the printer frame and printer housing,
  • Fig. 3a is a view in the direction of arrow A of the locking cap against the bottom and
  • Fig. 3b seen a horizontal section B - C through the locking cap from above.

Der in Fig. 1 gezeichnete Drucker ist z.B. ein Matrixdrucker mit einem (nicht gezeigten) Nadeldruckkopf, der in Hin- und Herbewegungen vor einem Aufzeichnungsträger während des Schreibens bewegt wird. Hierbei ist innerhalb des Druckergehäuses 1, das aus einem Gehäuseoberteil 1a und einem Gehäuseunterteil 1 b gebildet ist, eine Druckmechanik 2 angeordnet, die im wesentlichen aus einer (jeweils nicht gezeigten) Papierführung, Papiertransporteinrichtung, Druckkopfführung, Druckkopfantrieb u.dgl. besteht.The printer shown in FIG. 1 is, for example, a matrix printer with a needle print head (not shown) which is moved back and forth in front of a recording medium during writing. Here is inside the printer housing ses 1, which is formed from an upper housing part 1 a and a lower housing part 1 b, a printing mechanism 2 is arranged, which essentially consists of a paper guide, paper transport device, print head guide, print head drive and the like (not shown in each case). consists.

Ein solches Druckergehäuse 1 ist in einem begrenzten Umfang schallisolierend. Die Druckmechanik 2 ist an einem metallischen Druckerrahmen 3 befestigt, der im wesentlichen aus zwei Seitenteilen 3a und einem Bodenteil 3b besteht. Das Druckergehäuse 1 stützt sich im Gegensatz zu den bekannten Druckern nicht auf eine Stellfäche 4 auf. Der Bodenteil 3b des Druckerrahmens 3 ist vielmehr mit Gerätefüßen 5 versehen, die aus elastischen Materialien, wie z.B. Gummi, hergestellt sind und sich unmittelbar auf die Stellfläche 4 aufstützen. Das Gewicht des Druckers ruht daher auf drei bis vier solcher Gerätefüße 5. Letztere ragen durch Gehäuseöffnungen 1c hindurch, ohne das Druckergehäuse 1 zu berühren. Das Druckergehäuse 1 ist am Bodenteil 3b "schwimmend" aufgehängt, und zwar wie folgt: Der Druckerrahmen 3 weist in einem geringen Abstand zu den Gerätefüßen 5 Verbindungen 6 zwischen dem Druckergehäuse 1 (bzw. dem Gehäuseunterteil 1b) und dem Druckerrahmen 3 auf, wobei eine solche Verbindung 6 im Stützkraftfluß ein Dämmelement 7 enthält. Das Dämmelement 7 kann sehr weich gewählt werden, wodurch eine äußerst vorteilhafte Körperschalldämmung erzielt wird.Such a printer housing 1 is soundproof to a limited extent. The printing mechanism 2 is fastened to a metallic printer frame 3, which essentially consists of two side parts 3a and a bottom part 3b. In contrast to the known printers, the printer housing 1 is not based on a footprint 4. Rather, the bottom part 3b of the printer frame 3 is provided with device feet 5 which are made of elastic materials, such as e.g. Rubber, are made and rely directly on the footprint 4. The weight of the printer therefore rests on three to four such device feet 5. The latter protrude through housing openings 1c without touching the printer housing 1. The printer housing 1 is suspended "floating" on the bottom part 3b, as follows: The printer frame 3 has connections 6 between the printer housing 1 (or the lower housing part 1b) and the printer frame 3 at a short distance from the device feet 5, one of which such connection 6 contains an insulating element 7 in the supporting force flow. The insulation element 7 can be selected to be very soft, as a result of which extremely advantageous structure-borne sound insulation is achieved.

Die Verbindung 6 besteht aus einem mit dem Gehäuseunterteil 1b zusammen aus Kunststoff gespritzten Befestigungszapfen 8, wobei das Dämmelement 7 aus einer Dämmhülse 9 aus elastischem Werkstoff gebildet ist. Auf dem Befestigungszapfen 8 ist eine Verriegelungskappe 10 angeordnet.The connection 6 consists of a fastening pin 8 injection molded together with the lower housing part 1b from plastic, the insulating element 7 being formed from an insulating sleeve 9 made of elastic material. A locking cap 10 is arranged on the fastening pin 8.

In den Fig. 3, 3a und 3b sind Einzelheiten der Verbindung 6 größer dargestellt. Der Befestigungszapfen 8 ist am Gehäuseunterteil 1 angespritzt, ist innen hohl (Hohlraum 11) und bildet Spreizarme 12, indem Schlitze 13 radial eingearbeitet sind (Fig. 3b). Eine federnde Wirkung der Spreizarme 12 wird durch einen Querschnittsabsatz 14 verstärkt. An der Spitze 15 ist jeweils eine Rastnase 16 vorgesehen. Sämtliche Rastnasen 16 werden durch die Verriegelungskappe 10 untergriffen. Die Verriegelungskappe 10 weist hierzu eine Formöffnung 17 auf (Fig. 3a). Jedem der drei vorhandenen Spreizarme 12 ist eine radial größere Einführungsöffnung 17a zugeordnet. Nach axialem Aufsetzen der Verriegelungskappe 10 wird durch Drehen die Rastnase 16 durch radial engere Abschnitte 17b untergriffen, so daß axial verriegelt ist und das Druckergehäuse 1 (bzw. das Gehäuseunterteil 1 b) mit dem Bodenteil 3b des Druckerrahmens 3 federnd verbuden ist. Das Dämmelement 7, das in Form einer runden Dämmhülse 9 ausgeführt ist, weist am äußeren Umfang eine Nut 18 auf, in der der Rand einer kleineren runden Öffnung 19 des Bodenteils 3b eingreift.3, 3a and 3b, details of the connection 6 are shown larger. The fastening pin 8 is molded onto the lower housing part 1, is hollow on the inside (cavity 11) and forms spreading arms 12 by slots 13 being incorporated radially (FIG. 3b). A resilient effect of the spreading arms 12 is reinforced by a cross-sectional shoulder 14. A detent 16 is provided at each tip 15. All locking lugs 16 are gripped by the locking cap 10. For this purpose, the locking cap 10 has a shaped opening 17 (FIG. 3a). A radially larger insertion opening 17a is assigned to each of the three spreading arms 12 present. After the locking cap 10 has been put on axially, the catch 16 is gripped by turning through radially narrower sections 17b so that it is axially locked and the printer housing 1 (or the lower housing part 1b) is resiliently connected to the bottom part 3b of the printer frame 3. The insulating element 7, which is designed in the form of a round insulating sleeve 9, has a groove 18 on the outer circumference, in which the edge of a smaller round opening 19 of the base part 3b engages.

Das Druckergehäuse 1 ist wie beschrieben im Ausführungsbeispiel aus dem Gehäuseoberteil 1a und dem Gehäuseunterteil 1 zusammengesetzt. Zwischen beiden verläuft eine Trennfuge 20. Innerhalb der Trennfuge 20 ist eine Dichtungsschnur 21 verlegt, so daß Schallwellen nicht nach draußen aus dem Druckergehäuse 1 dringen können.As described in the exemplary embodiment, the printer housing 1 is composed of the upper housing part 1 a and the lower housing part 1. A joint 20 runs between the two. A sealing cord 21 is laid within the joint 20, so that sound waves cannot penetrate outside of the printer housing 1.

Für die Papierzufuhr weist das Druckergehäuse 1 (bzw. das Gehäuseunterteil 1b) eine untere Papier- öffnung 22 und für den Papierabzug eine obere Papieröffnung 23 auf. Während des Papierdurchlaufes werden an den Öffnungen 22 und 23 unvermeidlich Schallwellen das Druckergehäuse 1 verlassen. Außerdem befinden sich zur Kühlung der im Druckergehäuse 1 befindlichen elektrischen Einrichtungen, wie z.B. Motoren, Schaltteile, Leiterplatten u.dgl., Kühlluftschlitze 24 im Gehäuseunterteil 1b. Der aus dem Gehäuseunterteil 1 austretende Schall wird durch eine zumindest an drei Seiten umlaufende, sich nach unten in Richtung auf die Stellfäche 4 erstreckende Schallschürze 25 gedämmt. Das mit den erfindungsgemäßen Schalldämmungsmaßnahmen insgesamt zu erreichende Schalldämmaß des Druckergehäuses 1, bezogen auf den "Meßpunkt am fiktiven Arbeitsplatz" nach DIN 45635, Teil 19 (entspricht ISO 7779), beträgt etwa 16 dB (A) oder mehr.The printer housing 1 (or the lower housing part 1b) has a lower paper opening 22 for the paper feed and an upper paper opening 23 for the paper take-off. During the paper flow, sound waves will inevitably leave the printer housing 1 at the openings 22 and 23. In addition, for cooling the electrical devices located in the printer housing 1, e.g. Motors, switching parts, printed circuit boards and the like, cooling air slots 24 in the lower housing part 1b. The sound emerging from the lower housing part 1 is insulated by a sound apron 25 which runs around at least on three sides and extends downwards in the direction of the shelf 4. The total sound insulation of the printer housing 1 to be achieved with the sound insulation measures according to the invention, based on the "measuring point at the fictitious work station" according to DIN 45635, part 19 (corresponds to ISO 7779), is approximately 16 dB (A) or more.

Claims (6)

1. Printer, especially matrix printer having tapping printing elements, also having a printing mechanism (2) disposed in a noise-reducing printer housing (1), the moving parts of which mechanism produce noise, the printing mechanism being fixed to a printer frame (3) and the printer being supported on a mounting surface (4) by means of a plurality of apparatus feet (5), characterized in that the printer frame (3) carrying the printing mechanism (2) with the tapping printing elements is supported directly on the mounting surface (4) by means of the apparatus feet (5), that the apparatus feet (5) pass without contact through the printer housing (1), each through a housing opening (1c), and that an insulating element (7) is provided inside each of several connections (6) between printer frame (3) and printer housing (1).
2. Printer according to Claim 1, characterized in that the connection (6) between printer frame (3) and printer housing (1) is formed in each case by a fixing stud (8) provided on the printer frame (3), an insulating sleeve (9) surrounding this stud and fixed to the printer frame (3), and a locking cap (10) seated on the fixing stud (8).
3. Printer according to Claim 2, characterized in that the fixing stud (8) is integrally formed in one piece on the printer housing (1), is internally hollow and forms expanding arms (12).
4. Printer according to Claims 1 and 2, characterized in that the insulating element (7) is fixed to the printer frame (3) by means of an externally peripheral groove (18) in a round opening (19).
5. Printer according to Claims 1 to 4, characterized in that a removable housing upper part (1a) is sealed at the parting joint (20) with respect to a housing lower part (1b) by means of a peripheral sealing cord (21).
6. Printer according to Claims 1 to 5, characterized in that a printer housing (1) provided on the lower face (1 b) with cooling air slits (24) is provided with a downwardly extending acoustic apron (25), extending around at least three sides.
EP86115257A 1985-11-06 1986-11-04 Printer, especially a matrix printer with impacting printing elements Expired EP0224737B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86115257T ATE43295T1 (en) 1985-11-06 1986-11-04 PRINTER, ESPECIALLY MATRIX PRINTER WITH IMPACTING PRINTING ELEMENTS.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3539290 1985-11-06
DE3539290A DE3539290C1 (en) 1985-11-06 1985-11-06 Printers, in particular matrix printers with striking printing elements

Publications (2)

Publication Number Publication Date
EP0224737A1 EP0224737A1 (en) 1987-06-10
EP0224737B1 true EP0224737B1 (en) 1989-05-24

Family

ID=6285256

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86115257A Expired EP0224737B1 (en) 1985-11-06 1986-11-04 Printer, especially a matrix printer with impacting printing elements

Country Status (5)

Country Link
US (1) US4726699A (en)
EP (1) EP0224737B1 (en)
JP (1) JPS62142671A (en)
AT (1) ATE43295T1 (en)
DE (2) DE3539290C1 (en)

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DE3926572A1 (en) * 1989-08-11 1991-02-14 Triumph Adler Ag TYPEWRITER, PRINTER OD. DGL.
DE3930364A1 (en) * 1989-09-12 1991-03-21 Heidelberger Druckmasch Ag PROTECTIVE DEVICE FOR OFFSET ROTARY PRINTING MACHINES
US5017032A (en) * 1990-03-30 1991-05-21 Green Dennis L Printer enclosure
US5240336A (en) * 1990-04-27 1993-08-31 Matsushita Electric Industrial Co., Ltd. Dot matrix printer with suppressed printing noises
CA2073817C (en) * 1991-07-15 1996-02-13 Harry M. Horton Mechanical security device for facsimile machines
US5413427A (en) * 1993-11-09 1995-05-09 Hewlett-Packard Company Printer architecture structure
DE29920496U1 (en) * 1999-11-23 2000-02-17 Schwarz Verbindungs-Systeme GmbH, 75382 Althengstett Vibration-damping connection arrangement for two mutually displaceable components
US6786662B2 (en) 2002-10-11 2004-09-07 Hewlett-Packard Development Company, L.P. Apparatus and method to avoid detecting output motion and media movement
US7207737B2 (en) * 2004-09-24 2007-04-24 Videojet Technologies Inc. Thermal transfer printer cover
WO2006062686A2 (en) * 2004-11-12 2006-06-15 Pertech Resources Inc. Transaction printer
JP4389768B2 (en) * 2004-11-25 2009-12-24 株式会社デンソー In-vehicle device
JP4845493B2 (en) * 2005-12-02 2011-12-28 キヤノン株式会社 Image forming apparatus
WO2019074493A1 (en) 2017-10-10 2019-04-18 Hewlett-Packard Development Company, L.P. Computers

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US1876640A (en) * 1929-02-12 1932-09-13 Underwood Elliott Fisher Co Typewriting machine
US2126326A (en) * 1935-11-01 1938-08-09 Underwood Elliott Fisher Co Typewriting machine
GB842583A (en) * 1958-03-05 1960-07-27 Triumph Werke Nuernberg Ag A releasable connecting means, in particular for connecting a typewriter to a support
DE1925792C3 (en) * 1969-05-21 1981-08-27 Lawrence Wayne N.J. Holmes Jun. Additional device for operating an electric typewriter
US4215762A (en) * 1979-05-24 1980-08-05 Cunningham Donald R Acoustical enclosure
DE3014284C2 (en) * 1980-04-15 1984-01-05 Adlerwerke Vorm. Heinrich Kleyer Ag, 6000 Frankfurt Storage of a mounting frame having side walls of a printer, a typewriter or an office machine of a similar type in a device housing

Also Published As

Publication number Publication date
EP0224737A1 (en) 1987-06-10
US4726699A (en) 1988-02-23
DE3663482D1 (en) 1989-06-29
ATE43295T1 (en) 1989-06-15
JPS62142671A (en) 1987-06-26
DE3539290C1 (en) 1987-04-23

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