EP0360728B1 - Print head gap adjusting device for a printer, in particular for a matrix needle printer - Google Patents
Print head gap adjusting device for a printer, in particular for a matrix needle printer Download PDFInfo
- Publication number
- EP0360728B1 EP0360728B1 EP89730187A EP89730187A EP0360728B1 EP 0360728 B1 EP0360728 B1 EP 0360728B1 EP 89730187 A EP89730187 A EP 89730187A EP 89730187 A EP89730187 A EP 89730187A EP 0360728 B1 EP0360728 B1 EP 0360728B1
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- EP
- European Patent Office
- Prior art keywords
- printer
- print head
- pair
- head
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J25/00—Actions or mechanisms not otherwise provided for
- B41J25/304—Bodily-movable mechanisms for print heads or carriages movable towards or from paper surface
- B41J25/308—Bodily-movable mechanisms for print heads or carriages movable towards or from paper surface with print gap adjustment mechanisms
- B41J25/3088—Bodily-movable mechanisms for print heads or carriages movable towards or from paper surface with print gap adjustment mechanisms with print gap adjustment means on the printer frame, e.g. for rotation of an eccentric carriage guide shaft
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J25/00—Actions or mechanisms not otherwise provided for
- B41J25/304—Bodily-movable mechanisms for print heads or carriages movable towards or from paper surface
- B41J25/308—Bodily-movable mechanisms for print heads or carriages movable towards or from paper surface with print gap adjustment mechanisms
Definitions
- the invention relates to a printer, in particular a dot matrix printer, with a printhead distance setting device, for adjusting the distance between the printhead and the print abutment for unevenly thick record carriers lying on the print abutment or a changing number of record carriers, with a mechanical scanning element resting on the record carrier or recorders Control of the transverse to the longitudinal direction adjustable printhead, which is arranged on a longitudinally movable printhead carriage, and with a printhead carriage, which is guided on a pair of parallel guide axes, one of which is supported by means of an eccentric pair and the other transversely in printer side walls, one on The stationary frame of the printer frame forms an actuator for the eccentric pair of the guide axis.
- a printhead distance setting device for adjusting the distance between the printhead and the print abutment for unevenly thick record carriers lying on the print abutment or a changing number of record carriers
- a mechanical scanning element resting on the record carrier or recorders
- Control of the transverse to the longitudinal direction adjustable printhead
- Such printhead spacing adjustment devices are required because of the short travel of printing elements, e.g. of printing needles, the stroke of which is approximately 0.3 to 0.5 mm.
- the typeface generated by the print head is essentially determined by a correctly set distance between the print head and the print abutment.
- This arrangement of the distance adjusting device on the print head carriage is not only complex and therefore uneconomical, but also increases the drive weight of the print head carriage.
- the accuracy depends on the controllability of the electric motor that is carried on the carriage.
- the present invention is based on the object of making the printhead spacing adjustment device simpler and lighter on a printer and of making it more precisely controllable.
- the object is achieved according to the invention in that one by the adjusting movements of the sensing element generated electrical analog signal in converted form of an electronic digital signal in an electronic circuit for controlling the stepper motor, and that the sensing element consists of a rotatably mounted on one end of a feeler lever, acted upon by a spring force and that at the other end Indicator is provided which interacts with a sensor of the electronic circuit for the generation of the analog signal.
- the entire printhead carriage with the printhead fixedly mounted thereon is transversely displaced, the stepping motor as an actuator not being located on the printhead carriage, so that the construction becomes simpler and lighter. Then the stepping motor can be controlled more precisely by the signal generation and signal transmission. The effort required for this is not significant. It is also important, however, that the operator is no longer left to choose the distance for the print head. An incorrect operation is therefore excluded. Such a sensing device is practically not susceptible to failure.
- the electronic circuit for the analog signal consists of an operational amplifier connected downstream of the sensor, an analog-digital converter, a microprocessor and a driver circuit, by means of which the stepper motor can be controlled. These components can easily be arranged within a printed circuit without taking up a significant amount of space.
- a special further development of the invention with the aim of a practical, full paper support (air bubble-free resting of the recording medium or the interference-free paper advancement or retraction) is created in that the carrier housing for the sensing roller results in a part of a guide profile, which together with a pressure abutment carrier a supply channel forms for the record carrier.
- the transmission of the positioning movements of the stepper motor to the pair of eccentrics of the guide axis is further favored by the fact that a motor pinion of the stepper motor is provided with gears of an intermediate gear a gear segment is in drive connection, which is rotatably attached to the eccentrics of the guide axis.
- gearwheel segment can be moved into a basic position against a stop when the stepping motor is switched on. In this case, when you switch on again, you are asked which paper thickness is available and any incorrect distance setting is corrected.
- the printer can be a dot matrix printer, a thermal transfer printer, an ink jet printer, a bubble jet printer, a page printer or the like.
- the printer has a print head distance setting device for setting the distance 1 between print head 2 and print abutment 3.
- the pressure abutment 3 is advantageously designed as a pressure beam 3a with a vertically extended flat surface 3b.
- recording media 4 can have single or multiple paper thicknesses, such as in the case of multiple paper layers (carbon copies) or different paper thicknesses. In many applications, different forms are fed to the printer from several compartments.
- the thickness of the existing individual or the plurality of recording media 4 is automatically determined via a scanning element 5.
- the scanning member 5 consists of a scanning roller 5a and serves to control the transverse to the longitudinal direction, i.e. Printhead 2 adjustable in the transverse direction 6.
- the printhead 2 is fastened on a printhead carriage 7 which can be moved in the longitudinal direction.
- the print head carriage 7 is moved back and forth in the longitudinal direction as usual in front of the platen 3 by means of a drive (not shown), the print head 2 generating characters or images on the recording medium 4 via the printing elements 2 a.
- an ink ribbon 8 is also provided for this.
- the print head carriage 7 is guided on a pair of parallel guide axes 9, one of which (the one shown) is provided with a pair of eccentrics 10, which form eccentric eccentrics.
- the eccentrics of the eccentric pair 10 are each rotatably mounted in the printer side walls 32.
- the second (not shown) guide axis (9) guides the print head carriage 7 in the vertical direction, but not in the horizontal direction.
- an electrically generated analog signal is now generated which, after amplification and conversion into a digital signal, is used in an electronic circuit 11 for the control of a stepping motor 12 which is fixedly mounted on the printer frame.
- the stepper motor 12 forms an actuator 13 for the eccentric pair 10 of the guide axis 9.
- the mechanical part of the printhead gap adjuster namely the scanning member 5 carries the scanning roller 5a, which is rotatably mounted on one end 14a of a scanning lever 14, and on the other end 14b an indicator 15 is provided which cooperates with a sensor 16 of the electronic circuit 11 for the generation of the analog signal.
- the feeler lever 14 is rotatably supported about a horizontal axis 17 in a carrier housing 18 and is pulled against the recording medium (s) 4 by means of a tension spring 14c.
- the carrier housing 18 also houses the electronic circuit 11.
- the sensor 16 consists of a field plate differential sensor, and the indicator 15 consists of a soft iron part.
- the electronic circuit 11 accommodated in the carrier housing 18 is connected to the sensor 16, which generates the analog signal.
- the sensor 16 is followed by an operational amplifier 19, an analog-digital converter 20, a microprocessor 21 and a driver circuit 22.
- the digitized signal of the driver circuit 22 controls the stepper motor 12.
- the driver circuit 22 is connected to the stepper motor 12 via corresponding control lines 23a and 23b.
- the carrier housing 18 at the same time forms part of a guide profile 24 which, together with a pressure abutment carrier 25, forms a feed channel 26 for the one or more recording media 4.
- a motor pinion 27 drives a gearwheel segment 29 via a gearwheel 28 of an intermediate gear, which gear segment 29 is fixed in a rotationally fixed manner on the eccentrics 10 of the guide axis 9.
- the gear segment 29 can be moved against a stop 30 into the illustrated basic position 31.
- the guide axis 9 mounted in the printer side walls 32 is adjustable by means of its pair of eccentrics 10, as a result of which the distance 1 between the print head 2 and the pressure abutment 3 is adjustable.
- the gear segment 29, which is connected to the eccentric 10 in a rotationally fixed manner moves the guide axis 9 and thus the print head carriage 7 and thus the print head 2, so that the distance 1 changes. It is not necessary to equip both eccentrics 10 with a gear segment 29.
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- Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)
- Facsimile Heads (AREA)
Abstract
Description
Die Erfindung betrifft einen Drucker, insbesondere einen Matrixnadeldrucker, mit einer Druckkopfabstandseinstelleinrichtung, zur Einstellung des Abstandes zwischen Druckkopf und Druckwiderlager für auf dem Druckwiderlager aufliegende ungleich dicke Aufzeichnungsträger oder eine wechselnde Anzahl von Aufzeichnungsträgern, mit einem auf dem oder den Aufzeichnungsträgern aufliegenden mechanischen Abtastglied, das zur Steuerung des quer zur Längsrichtung anstellbaren Druckkopfes dient, der auf einem längsbewegbaren Druckkopfschlitten angeordnet ist, und mit einem Druckkopfschlitten, der auf einem Paar paralleler Führungsachsen geführt ist, von denen eine Führungsachse mittels eines Exzenterpaares und die andere querbeweglich in Druckerseitenwänden gelagert ist, wobei ein am Druckerrahmen ortsfest gelagerter Schrittmotor einen Stelltrieb für das Exzenterpaar der Führungsachse bildet. Eine derartige Vorrichtung ist bekannt (US-A1-4,420,269). Der Aufbau einer solchen Vorrichtung kann noch einfacher gestaltet und die Steuerung muß noch genaner werden.The invention relates to a printer, in particular a dot matrix printer, with a printhead distance setting device, for adjusting the distance between the printhead and the print abutment for unevenly thick record carriers lying on the print abutment or a changing number of record carriers, with a mechanical scanning element resting on the record carrier or recorders Control of the transverse to the longitudinal direction adjustable printhead, which is arranged on a longitudinally movable printhead carriage, and with a printhead carriage, which is guided on a pair of parallel guide axes, one of which is supported by means of an eccentric pair and the other transversely in printer side walls, one on The stationary frame of the printer frame forms an actuator for the eccentric pair of the guide axis. Such a device is known (US-A1-4,420,269). The construction of such a device can be made even simpler and the control must be more precise.
Derartige Druckkopfabstandseinstellvorrichtungen sind erforderlich wegen des geringen Hubweges von Druckelementen, wie z.B. von Drucknadeln, deren Hubweg etwa 0,3 bis 0,5 mm beträgt. Das von dem Druckkopf erzeugte Schriftbild wird wesentlich durch einen richtig eingestellten Abstand zwischen Druckkopf und Druckwiderlager bestimmt.Such printhead spacing adjustment devices are required because of the short travel of printing elements, e.g. of printing needles, the stroke of which is approximately 0.3 to 0.5 mm. The typeface generated by the print head is essentially determined by a correctly set distance between the print head and the print abutment.
Es ist außerdem eine Einrichtung zur Einstellung des Abstandes eines Druckkopfes senkrecht zum Druckwiderlager bekannt (DE-C1-27 52 061), die zur veränderbaren Abstandsregelung des Druckkopfes gegenüber dem Aufzeichnungsträger in Abhängigkeit unterschiedlicher Stärken und Lagen des auf dem Druckwiderlager aufliegenden Aufzeichnungsträgers dient, bei der der Druckkopf auf dem parallel zum Druckwiderlager bewegbaren Transportschlitten durch einen von einem Elektromotor antreibbaren Exzenter verschiebbar ist, wobei der Elektromotor durch einen mechanisch-elektrischen Umsetzer steuerbar ist, der seinerseits durch die veränderbare Stärke der auf dem Druckwiderlager aufliegenden Aufzeichnungsträger beeinflußbar ist.There is also known a device for adjusting the distance of a print head perpendicular to the platen (DE-C1-27 52 061), which is used for variable distance control of the printhead relative to the record carrier depending on different thicknesses and positions of the record carrier lying on the platen, in which the print head can be moved on the transport carriage, which can be moved parallel to the platen, by an eccentric that can be driven by an electric motor, the electric motor being controllable by a mechanical-electrical converter, which in turn can be controlled by the changeable thickness of the supports on the platen Record carrier can be influenced.
Diese Anordnung der Abstandseinstellvorrichtung auf dem Druckkopfschlitten ist nicht nur aufwendig und daher unwirtschaftlich, sondern erhöht auch das Antriebsgewicht des Druckkopfschlittens. Außerdem hängt die Genauigkeit von der Steuerbarkeit des Elektromotors, der auf dem Schlitten mitgeführt wird, ab.This arrangement of the distance adjusting device on the print head carriage is not only complex and therefore uneconomical, but also increases the drive weight of the print head carriage. In addition, the accuracy depends on the controllability of the electric motor that is carried on the carriage.
Der vorliegenden Erfindung liegt demgegenüber die Aufgabe zugrunde, an einem Drucker die Druckkopfabstandseinstelleinrichtung einfacher und leichter zu gestalten und genauer steuerbar zu machen.In contrast, the present invention is based on the object of making the printhead spacing adjustment device simpler and lighter on a printer and of making it more precisely controllable.
Ausgehend von der eingangs bezeichneten Gattung, u.a. von einem Druckkopfschlitten, der auf einem Paar paralleler Führungsachsen geführt ist, von denen eine Führungsachse mittels eines Exzenterpaares und die andere querbeweglich in Druckerseitenwänden gelagert ist, wird die gestellte Aufgabe erfindungsgemäß dadurch gelöst, daß ein durch die Einstellbewegungen des Abtastgliedes erzeugbares elektrisches Analogsignal in umgewandelter Form eines elektronischen Digitalsignals in einer elektronischen Schaltung für die Steuerung des Schrittmotors dient, und daß das Abtastglied aus einer an dem einen Ende eines Tasthebels drehbar gelagerten, mit einer Federkraft beaufschlagten Tastrolle besteht und daß an dem anderen Ende ein Indikator vorgesehen ist, der mit einem Sensor der elektronischen Schaltung für die Erzeugung des Analogsignals zusammenwirkt. Vorteilhafterweise wird hier der ganze Druckkopfschlitten mit dem darauf fest gelagerten Druckkopf querverstellt, wobei der Schrittmotor als Stellantrieb sich nicht auf dem Druckkopfschlitten befindet, so daß die Bauweise einfacher und leichter wird. Sodann wird durch die Signalerzeugung und Signalübertragung der Schrittmotor genauer steuerbar. Der hierfür erforderliche Aufwand ist nicht erheblich. Von Bedeutung ist jedoch auch, daß dem Bediener nicht mehr überlassen bleibt, welchen Abstand er für den Druckkopf wählt. Eine Fehlbedienung wird demnach ausgeschlossen. Eine solche Fühleinrichtung ist praktisch nicht störanfällig.Starting from the genus described at the outset, including a printhead carriage which is guided on a pair of parallel guide axes, one of which is supported by means of an eccentric pair and the other is mounted transversely in the printer side walls, the object is achieved according to the invention in that one by the adjusting movements of the sensing element generated electrical analog signal in converted form of an electronic digital signal in an electronic circuit for controlling the stepper motor, and that the sensing element consists of a rotatably mounted on one end of a feeler lever, acted upon by a spring force and that at the other end Indicator is provided which interacts with a sensor of the electronic circuit for the generation of the analog signal. Advantageously, the entire printhead carriage with the printhead fixedly mounted thereon is transversely displaced, the stepping motor as an actuator not being located on the printhead carriage, so that the construction becomes simpler and lighter. Then the stepping motor can be controlled more precisely by the signal generation and signal transmission. The effort required for this is not significant. It is also important, however, that the operator is no longer left to choose the distance for the print head. An incorrect operation is therefore excluded. Such a sensing device is practically not susceptible to failure.
Eine vorteilhafte Ausgestaltungsform der Erfindung wird dadurch erzielt, indem die elektronische Schaltung für das Analogsignal aus einem dem Sensor nachgeschalteten Operationsverstärker, einem Analog-Digital-Wandler, einem Mikroprozessor und einer Treiberschaltung besteht, mittels deren der Schrittmotor steuerbar ist. Diese Bauelemente können leicht innerhalb einer gedruckten Schaltung angeordnet werden, ohne einen wesentlichen Bauraum zu beanspruchen.An advantageous embodiment of the invention is achieved in that the electronic circuit for the analog signal consists of an operational amplifier connected downstream of the sensor, an analog-digital converter, a microprocessor and a driver circuit, by means of which the stepper motor can be controlled. These components can easily be arranged within a printed circuit without taking up a significant amount of space.
Die einfachere Bauweise ergibt sich ferner dadurch, daß der Tasthebel und der Sensor an einem Trägergehäuse angeordnet sind, in dem auch die elektronische Schaltung angeordnet ist.The simpler design also results from the fact that the feeler lever and the sensor are arranged on a carrier housing in which the electronic circuit is also arranged.
Eine spezielle Weiterentwicklung der Erfindung mit dem Ziel einer praxisgerechten satten Papierauflage (luftblasenfreies Aufliegen des oder der Aufzeichnungsträger bzw. ein störungsfreies Papiervorschieben oder Zurückfahren) wird dadurch geschaffen, daß das Trägergehäuse für die Tastrolle einen Teil eines Leitprofils ergibt, das zusammen mit einem Druckwiderlagerträger einen Zuführungskanal für den Aufzeichnungsträger bildet.A special further development of the invention with the aim of a practical, full paper support (air bubble-free resting of the recording medium or the interference-free paper advancement or retraction) is created in that the carrier housing for the sensing roller results in a part of a guide profile, which together with a pressure abutment carrier a supply channel forms for the record carrier.
Die Übertragung der Anstellbewegungen des Schrittmotors auf das Exzenterpaar der Führungsachse wird noch dadurch begünstigt, daß ein Motorritzel des Schrittmotors über Zahnräder eines Zwischengetriebes mit einem Zahnradsegment in Antriebsverbindung steht, das drehfest auf den Exzentern der Führungsachse befestigt ist.The transmission of the positioning movements of the stepper motor to the pair of eccentrics of the guide axis is further favored by the fact that a motor pinion of the stepper motor is provided with gears of an intermediate gear a gear segment is in drive connection, which is rotatably attached to the eccentrics of the guide axis.
Vorteilhaft ist außerdem, wenn das Zahnradsegment beim Einschalten des Schrittmotors gegen einen Anschlag in eine Grundstellung bewegbar ist. In diesem Fall wird bei einem erneuten Einschaltvorgang jeweils abgefragt, welche Papierstärke vorhanden ist und eine evtl. unzutreffende Abstandseinstellung korrigiert.It is also advantageous if the gearwheel segment can be moved into a basic position against a stop when the stepping motor is switched on. In this case, when you switch on again, you are asked which paper thickness is available and any incorrect distance setting is corrected.
In der Zeichnung ist ein Ausführungsbeispiel der Erfindung schematisch dargestellt und wird nachfolgend näher erläutert. Es zeigen
- Fig. 1
- eine Funktionsdarstellung mit den betroffenen Teilen des Druckers im Querschnitt
(Druckwiderlagerträger mit einem Druckkopfschlitten (teilweise) in Verbindung mit einem Blockschaltbild für Signaleingang und Signalausgang bzw. Signalverarbeitung). - Fig. 2
- eine Einzelheit des Exzenterpaares
- Fig. 1
- a functional representation with the affected parts of the printer in cross section
(Pressure abutment carrier with a print head carriage (partially) in connection with a block diagram for signal input and signal output or signal processing). - Fig. 2
- a detail of the eccentric pair
Der Drucker kann ein Matrixnadeldrucker, ein Thermotransferdrucker, ein Tintenstrahldrucker, ein Bubble-Jet-Drucker, ein Page-Printer oder dgl. sein. Der Drucker weist eine Druckkopfabstandseinstelleinrichtung zur Einstellung des Abstandes 1 zwischen Druckkopf 2 und Druckwiderlager 3 auf. Das Druckwiderlager 3 ist vorteilhafterweise als Druckbalken 3a mit einer vertikal ausgedehnten ebenen Fläche 3b ausgeführt. Auf dem Druckwiderlager 3 liegen Aufzeichnungsträger 4 auf, die einfache oder mehrfache Papierdicke, wie z.B. bei Mehrfachpapierlagen (Durchschlägen) oder unterschiedliche Papierstärken aufweisen können. In vielen Anwendungsfällen werden dem Drucker aus mehreren Fächern verschiedene Formulare zugeführt.The printer can be a dot matrix printer, a thermal transfer printer, an ink jet printer, a bubble jet printer, a page printer or the like. The printer has a print head distance setting device for setting the distance 1 between
Die Dicke des vorhandenen einzelnen oder der Vielzahl von Aufzeichnungsträgern 4 wird automatisch über ein Abtastglied 5 ermittelt. Wie dargestellt, besteht hier das Abtastglied 5 aus einer Abtastrolle 5a und dient zur Steuerung des quer zur Längsrichtung, d.h. in Querrrichtung 6 anstellbaren Druckkopfes 2. Der Druckkopf 2 ist auf einem in Längsrichtung bewegbaren Druckkopfschlitten 7 befestigt. Der Druckkopfschlitten 7 wird mittels eines weiter nicht dargestellten Antriebs in Längsrichtung wie üblich vor dem Druckwiderlager 3 hin- und herbewegt, wobei der Druckkopf 2 über die Druckelemente 2a Schriftzeichen oder Bilder auf dem Aufzeichnungsträger 4 erzeugt. Bei Matrixnadeldruckern ist hierzu noch ein Farbband 8 vorgesehen. Der Druckkopschlitten 7 ist auf einem Paar paralleler Führungsachsen 9 geführt, von denen eine (die gezeigte) mit einem Exzenterpaar 10 versehen ist, die gleichexzentrische Exzenter bilden. Die Exzenter des Exzenterpaares 10 sind jeweils in Druckerseitenwänden 32 drehbar gelagert. Die zweite (nicht gezeigte) Führungsachse (9) führt den Druckkopfschlitten 7 in vertikaler Richtung, jedoch nicht in horizontaler Richtung.The thickness of the existing individual or the plurality of
Bei Bewegung des Abtastgliedes 5 in beiden Schwenkrichtungen entsteht nunmehr ein elektrisch erzeugtes Analogsignal, das nach Verstärkung und Umwandlung in ein Digitalsignal in einer elektronischen Schaltung 11 für die Steuerung eines am Druckerrahmen ortsfest gelagerten Schrittmotors 12 dient. Der Schrittmotor 12 bildet einen Stelltrieb 13 für das Exzenterpaar 10 der Führungsachse 9.When the scanning element 5 is moved in both pivoting directions, an electrically generated analog signal is now generated which, after amplification and conversion into a digital signal, is used in an
Der mechanische Teil der Druckkopfabstandseinstelleinrichtung, nämlich das Abtastglied 5 trägt die an dem einen Ende 14a eines Tasthebels 14 drehgelagerte Abtastrolle 5a, und an dem anderen Ende 14b ist ein Indikator 15 vorgesehen, der mit einem Sensor 16 der elektronischen Schaltung 11 für die Erzeugung des Analogsignals zusammenarbeitet. Der Tasthebel 14 ist um eine horizontale Achse 17 in einem Trägergehäuse 18 drehgelagert und wird mittels einer Zugfeder 14c gegen den oder die Aufzeichnungsträger 4 gezogen. Das Trägergehäuse 18 nimmt auch die elektronische Schaltung 11 auf. Der Sensor 16 besteht aus einem Feldplatten-Differential-Fühler, und der Indikator 15 aus einem Weicheisenteil.The mechanical part of the printhead gap adjuster, namely the scanning member 5 carries the
Die im Trägergehäuse 18 untergebrachte elektronische Schaltung 11 ist an den Sensor 16 angeschlossen, der das Analogsignal erzeugt. Dem Sensor 16 ist ein Operationsverstärker 19, diesem ein Analog-Digital- Wandler 20, diesem ein Mikroprozessor 21 und diesem eine Treiberschaltung 22 nachgeschaltet. Das digitalisierte Signal der Treiberschaltung 22 steuert den Schrittmotor 12. Die Treiberschaltung 22 ist über entsprechende Steuerleitungen 23a und 23b an den Schrittmotor 12 angeschlossen.The
Das Trägergehäuse 18 bildet gleichzeitig Teil eines Leitprofils 24, das zusammen mit einem Druckwiderlagerträger 25 einen Zuführungskanal 26 für den oder die Aufzeichnungsträger 4 bildet.The carrier housing 18 at the same time forms part of a
Auf der Welle des Schrittmotors 12 treibt ein Motorritzel 27 über ein Zahnrad 28 eines Zwischengetriebes ein Zahnradsegment 29, das drehfest auf den Exzentern 10 der Führungsachse 9 befestigt ist. Das Zahnradsegment 29 ist bei Einschalten des Druckers und/oder des Schrittmotors 12 gegen einen Anschlag 30 in die gezeichnete Grundstellung 31 bewegbar.On the shaft of the
Die in den Druckerseitenwänden 32 gelagerte Führungsachse 9 ist mittels ihres Exzenterpaares 10 verstellbar, wodurch der Abstand 1 zwischen Druckkopf 2 und Druckwiderlager 3 verstellbar wird. Bei Bewegung des Zahnradsegments 29, das mit dem Exzenter 10 drehfest verbunden ist, verstellt sich die Führungsachse 9 und damit der Druckkopfschlitten 7 und somit der Druckkopf 2, so daß sich der Abstand 1 ändert. Es ist nicht notwendig, beide Exzenter 10 mit einem Zahnradsegment 29 auszustatten.The
Claims (6)
- A printer, in particular a wire matrix printer, with a print head gap-setting means for setting the distance (1) between the print head (2) and the print counter-surface (3) for record carriers (4) of unequal thickness which lie against the print counter-surface (3) or for a changing number of record carriers (4), with a mechanical detecting member (5) which lies on the record carrier or carriers (4) and which serves to control the print head (2) which is adjustable transversely to the longitudinal direction and which is arranged on a longitudinally movable print head carriage (7), and with a print head carriage (7) which is guided on a pair of parallel guide spindles (9) of which one guide spindle (9) is mounted by means of a pair of eccentrics (10) and the other is mounted to be transversely movable in printer side walls (32), with a stepping motor (12) which is mounted in stationary manner on the printer frame forming a setting drive (13) for the pair of eccentrics (10) of the guide spindle (9), characterised in that
an electrical analog signal which can be generated by the adjustment movements of the detecting member (5) in the converted form of an electronic digital signal in an electronic circuit (11) serves for controlling the stepping motor (12), and that the detecting member (5) consists of a detecting roller (5a) which is acted upon by a spring force and is mounted to rotate on one end (14a) of a detecting lever (14), and that an indicator (15) is provided at the other end (14b), which indicator cooperates with a sensor (16) of the electronic circuit (11) for generating the analog signal. - A printer according to Claim 1, characterised in that the electronic circuit (11) for the analog signal consists of an operational amplifier (19) succeeding the sensor (16), an analog-to-digital converter (20), a microprocessor (21) and a driver circuit (22), by means of which the stepping motor (12) can be controlled.
- A printer according to Claims 1 and 2, characterised in that the detecting lever (14) and the sensor (16) are located on a carrier housing (18) in which the electronic circuit (11) is also located.
- A printer according to Claims 1 to 3, characterised in that the carrier housing (18) for the detecting roller (5a) provides a portion of a guide profile (24) which together with a print counter-surface carrier (25) forms a feed channel (26) for the record carrier (4).
- A printer according to Claims 1 to 4, characterised in that a motor pinion (27) of the stepping motor (12) is in a drive connection with a gear wheel segment (29) via gear wheels (28) of an intermediate gear, which segment is attached to the eccentrics (10) of the guide spindle (9) so as to be resistant to rotation.
- A printer according to Claim 5, characterised in that the gear wheel segment (29) upon the switching-on of the stepping motor (12) can be moved against a stop (30) into a basic position (31).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT89730187T ATE92402T1 (en) | 1988-09-08 | 1989-08-16 | PRINTERS, IN PARTICULAR DOTS-MATRIX PRINTERS, WITH PRINT HEAD DISTANCE ADJUSTMENT DEVICE. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3830880A DE3830880A1 (en) | 1988-09-08 | 1988-09-08 | PRINTER, IN PARTICULAR MATRIX NEEDLE PRINTER, WITH A PRINT HEAD SPACER ADJUSTMENT DEVICE |
DE3830880 | 1988-09-08 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0360728A1 EP0360728A1 (en) | 1990-03-28 |
EP0360728B1 true EP0360728B1 (en) | 1993-08-04 |
Family
ID=6362729
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP89730187A Revoked EP0360728B1 (en) | 1988-09-08 | 1989-08-16 | Print head gap adjusting device for a printer, in particular for a matrix needle printer |
Country Status (5)
Country | Link |
---|---|
US (1) | US5193918A (en) |
EP (1) | EP0360728B1 (en) |
JP (1) | JPH0381174A (en) |
AT (1) | ATE92402T1 (en) |
DE (2) | DE3830880A1 (en) |
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KR20030017898A (en) * | 2001-08-25 | 2003-03-04 | 이색용 | A bolt construction and combination method for moter cover |
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-
1988
- 1988-09-08 DE DE3830880A patent/DE3830880A1/en not_active Withdrawn
-
1989
- 1989-08-16 AT AT89730187T patent/ATE92402T1/en not_active IP Right Cessation
- 1989-08-16 DE DE8989730187T patent/DE58905131D1/en not_active Expired - Fee Related
- 1989-08-16 EP EP89730187A patent/EP0360728B1/en not_active Revoked
- 1989-09-06 JP JP1231333A patent/JPH0381174A/en active Pending
- 1989-09-08 US US07/404,893 patent/US5193918A/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
PATENT ABSTRACTS OF JAPAN, unexamined applications, Field M, Band 10, Nr. 109, 23.04.1986; JP A 60 240 483. * |
Also Published As
Publication number | Publication date |
---|---|
JPH0381174A (en) | 1991-04-05 |
US5193918A (en) | 1993-03-16 |
EP0360728A1 (en) | 1990-03-28 |
DE3830880A1 (en) | 1990-03-15 |
DE58905131D1 (en) | 1993-09-09 |
ATE92402T1 (en) | 1993-08-15 |
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