Mannesmann Aktiengesellschaft

Gunter Gomoll

Wolfgang Hauslaib

Ulrich Buschmann

Wolfgang Hendrischk

Alfred Babsch

Kurt Rohrer

Werner Rupp

Alois Hoffart

A paper transport device in printers (1), particularly in dot matrix printers, for the feeding of continuous webs (6) by transversely displaceable tractors (7, 8) which are arranged in pairs on the printer frame. The tractor pins (9) engage into the edge perforations of the continuous web (6) and the pin belts (10) are guided over at least one wheel (11) of the tractor (7, 8) and at least one driven tractor wheel (13) is present. The device is equipped with a locking device so that the tractor (7, 8) operating as push means or as pull means is mounted in each case on a drive shaft (14) and in each case prevented from turning on the printer fram (1a) by a projection (16) on the side (15a) opposite the drive shaft (14) or by a swingable tractor flap (24).

Device for the transport of paper in printers, particularly dot matrix

Apparatus for the selectably alternative feeding of single sheets and of endless webs of paper in a printer includes a guide roll (7), and first and second groups (8, 9) of friction rollers concurrently movable between first and second positions to define respective single sheet and endless web feeding modes of operation. In their first positions, the first friction rollers (8) contact the guide roll (7) to define a first single sheet feed channel (4) and the second friction rollers (9) contact the guide roll (7) to define a second single sheet feed channel (5). When shifted to their second positions, the first friction rollers (8) are displaced from their first position contact with the guide roll (7) to substantially eliminate the first single sheet feed channel (4), and the second friction roller (9) are lowered to form with the guide roll (7) an endless web feed channel (6).

Apparatus for the transport of paper in printers

A matrix printer is furnished with a matrix print head (1) supported on a back and forth movable slider (2), guided on a rail guide (3), wherein the print elements (4) can be operated at a high frequency. A matrix print head (1), disposed fixedly in its position relative to the slider (2), is furnished at least at one reference face (8) between the matrix print head (1) and the slider (2) with a sound-insulating layer (10) of an elastic material, and where the matrix print head (1) and the slider (2) can be braced and/or clamped to each other in this region. This construction opposes a sound formation and sound propagation via the print head, the slider (2) and the rail guide (3) by body sound conduction onto frame parts of the printer by employing sound-insulation and sound absorption.

Matrix printer employing a matrix print head on a movable slider having

The print substrate support (3) and longitudinal guides (4) for a print-head slider (7) are disposed in parallel at the invention printer. A controllable paper-guide drive motor (10) is furnished for the paper guide (9; 9a) and a drive motor (11) is furnished for the print-head slider (7). In order to be able to economically produce printers for different paper widths, and in order to eliminate problems of interfering radiation, a separated space (14) is furnished at the end of the paper guide (9; 9a) or respectively, of the longitudinal guide (4). At least one control-logic printed circuit board (15), an interface printed circuit board (16), the paper-guide drive motor (10) as well as the print-head-slider drive motor (11) are disposed in the separated enclosed space (14).

Printer, in particular matrix pin printer

In a printer, a drive motor, a drive roller arranged on the shaft of the motor, a reversal roller in spaced relation to the drive roller, and an elongated drive belt trained about the drive and reversal rollers form a tensioning device, the belt being fastened at its ends to a print-head carriage for selectively displacing the carriage in the forward and reverse directions along and relative to a printable substrate support roller or base. The reversal roller is carried in a carrier housing which movably and cooperatively engages a spring-loaded tensioning wedge for maintaining the elongated drive belt in a predetermined tensioned or stretched relation. In order to avoid the need for a separate or specialized drive motor and an additional drive belt for advancing an inked printing ribbon, the drive force for the inked-ribbon drive shaft is derived from the reversal roller which, in the normal operation of the printer, is rotatable in opposite directions for selectively positioning the print-head carriage along the printable substrate support. For this purpose, a clutch member is interposed between the reversal roller and a gearwheel associated with the inked-ribbon drive shaft, the clutch member being longitudinally movable into coupled and uncoupled relations with the inked-ribbon gearwheel as a function of the direction of rotation of the reversal roller.

Device for driving a printer print-head carriage having a belt

The printer with a substrate support (1) is furnished with a layer structure in a print support cross-section (11). The layer structure comprises a metallic print bar (13), a vibration-attenuating damping layer (14), and a metallic intermediate layer (15) disposed sequentially in print element operation direction (12), where the intermediate layer (15) acts only functionally as 'intermediate layer.' In order to avoid a space-requiring and bulky layer structure of an insulating layer (16), neutralizing the frequencies of contacting components, the frequency-neutralizing insulating layer (16) is formed by elastic caps (18) at the ends (17a, 17b) of a unit, where the unit is formed by print bar (13), damping and absorbing layer (14), and intermediate layer (15). The elastic caps (18) can be slid into the recesses (19) of the printer side walls (20).

Printer with a substrate support, in particular matrix pin printer

A circuit board arrangement that is for an electronic/electromechanical apparatus and that has a mechanically actuable switch for at least two different power line voltages includes a circuit board having a polygonal cutout therethrough, which defines a plurality of polygon sides. A plurality of contact surfaces on a first side of the circuit board is provided, each such contact surface being associated with a respective polygon side of the polygonal cutout. Each of the contact surfaces is connected to an electrical conductor of a power supply unit and is positioned such that a pair of contact surfaces opposite to each other with respect to the cutout correspond to one voltage. A contact spring extends into the cutout and has a pair of spring legs respectively contacting a pair of contact surfaces positioned opposite to each other with respect to the cutout.

Circuit board arrangement for electronic/electromechanical apparatus

A device for the feeding or advancement of an edgeperforated paper web (1) in a dot-matrix printer or the like includes a pair of drive belts (3) transversely spaced apart proximate opposite transverse edges of the web, each belt carrying on its upper surface (6) a series of pins (7) for releasable engagement with the edge-disposed web perforations (11). To provide an increase in friction between the paper web (1) and the drive belts (3) during transport of the web, and thereby assure enhanced accuracy and precision in operatively advancing the web, a plurality of upstanding or outwardly-protruding projections (17, 17a, 17b, 17c) are defined on the upper belt surface (6). These projections are located at least in the flat sections (16) of the belt between adjacently or successively-disposed ones of the pins (7) and, in another form of the invention, additionally at and coincident with the locations of the pins (7) which interrupt the transversely-oriented projections.

Device for improved control in the transport of edge-perforated paper

A device for the transport of multilayer, edge-perforated imprint-receiving substrates (8) takes into consideration a curve-shaped transport path (9), wherein a thrust tractor pair (5) is disposed in front and ahead of a substrate support (2), as seen in transport direction (10). Several friction roller pairs are following to the thrust tractor pair (5). In each case, a pulling force is transferrable by way of at least one friction roller. The multilayer imprint-receiving substrate (8) rests with its rear layer (8a) on the substrate support (2). A tearing of the edge perforations of the imprint-receiving substrate (8) as well as belly and bulge formations of one of the two layers (8a, 8b) is avoided by furnishing the push tractor (5) with a braking element (19) for the front layer (8b). A following first friction roller pair (11) rests with a driven friction roller (11a) at the front layer (8b). This friction roller (11a) performs a slightly smaller motion path per time unit relative to the counter friction roller (11b). However, the counter friction roller (11b), resting at the rear layer (8a), performs a slightly larger motion path relative to the tractor advance path.

Device for transport of multi-layer, edge-perforated imprint-receiving

In a device for the paper transport of single sheets and/or continuous paper in office machines, in particular in matrix printers, there are provided in pairs and at least separately driven friction rolls (1, 2) which are disposed rotatably in side plates; the friction rolls exhibit a length to diameter ratio of from 30:1 to 50:1 and are therefore very long and very thin. In order to provide the friction force in a uniform manner over the entire length of the very long and thin friction rolls, it is disclosed that the positive running bending line (16) of a first feed roll (1) based on its support forces (14a, 14b) in the printer frame (15) and the negative running bending line (17) of a second friction feed roll (2) based on its support forces (14a, 14b) in the printer frame (15) are tuned to each other such that the two bending lines (16, 22) run approximately parallel.

Device for the paper transport of single sheets and/or continuous paper

A device is disclosed for tensioning of a pulling element (1) of a printer and in particular of a matrix printer, for a back and forth motion of a part (5) or of a carriage includes a first deflection roller (11) and a second deflection roller (12). A wedge surface (15) is furnished, which upon increasing inclination (16) is slidable in a direction parallel to a frame surface (17) disposed perpendicular to the pulling direction (18) and which wedge is subjected to the force of a tension spring (22) such that the adjustable second deflection roller (12) serves the purpose of an increase of the tensioning force in the pulling element (1). In order to provide a substantially rigid system, which also takes the production stretching of a pulling element (1)--pulling cord--into consideration, it is disclosed to rotatably support the second deflection roller (12) with its roller bearings (24) in a lever (13), formed as a covered casing (23) and that an adjustable cam ( 25) resting at the wedge surface (15) is rotatably supported in the casing (23) and that the cam position can be fixed.

Device for tensioning of a pulling element of a printer

The platen roller in a matrix printer is mounted to the printer case so that stop plates of the mount define a representation of the disposition of the roller. A frame is provided to hold a guide rod on which rides a carriage, and the print head is secured to that carriage. Adjustable cams on the rod abut the stop plates when the frame is slid into the case to, thereby, establish the distance between head and platen. The frame carries also the head drive, its motor and the paper-feed motor, there being a key connection to the platen, maintaining a driving connection even for different cam adjustments and frame positions in the case.

Growing community of inventors

Nersingen/Leibi, Germany

Gunter Gomoll