Mannesmann Aktiengesellschaft

Kurt Rohrer

Bernd Gugel

Wolfgang Hauslaib

Gunter Gomoll

Ulrich Buschmann

Herbert Kitzberger

Clemens Kaufmann

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

A matrix pin print head of the hinged clapper armature construction includes several pin systems which, in each case, include a magnetic yoke limb pair (2), an electromagnetic coil (3), a hinged clapper armature (4), and a print pin (1). The multiple pin system further includes an electromagnetic coil support (13), which is produced by way of sintering or precision-casting, and which forms a single-piece component together with a base plate and the magnet yoke limb pairs (2). In a system with a low number of pins such as nine pins, the electromagnetic coil support (13) exhibits radially outwardly individual magnet yoke limbs (2a) and an armature guide, wherein the individual hinged clapper armatures (4) are precisely positioned and without cause for a loss of magnetic energy. In each case, the magnetic yoke limbs are directed toward a pin engagement point (8) or, respectively, to a pin attachment position (8b). The radial inner magnet yokes are formed to a closed, circular, or polygonal ring (17). Guide means (18), coordinated in each case to a course of pivot motions of the hinged clapper armatures (4), are coordinated to the hinged clapper armatures (4), where the guide means (18) cooperate with the receiving means (19) at the closed ring (17).

Matrix print head of hinged-clapper-armature construction

Growing community of inventors

Niederstotzingen, Germany

Kurt Rohrer