Abstract:
An apparatus for the bodily shifting of a printing roller in parallelism with itself in which the roller has a first printing position and a second printing position and is mounted on connecting rods or levers which are actuated by eccentrics for movement of the printing roller between its first and second positions. A drive shaft is provided and the eccentrics are driveable by the drive shaft by a coil spring surrounding the drive shaft which can be tightened up on the shaft to cause the shaft to drive the spring or loosened on the shaft to cause the shaft to rotate within the spring. The spring has its opposite ends connected to discs and is tensioned in the tightening up direction and the discs are adapted to be stopped by a pawl arrangement which holds the discs with the spring in loosened up position and is movable to release the discs of the spring and will tighten up on the shaft and be driven thereby.
Abstract:
A key operated switch for keyboards having an improved layer type construction comprising a key carrier and key return spring supporting printed circuit conductors and contacts so arranged as to facilitate fully automatic production of keyboards. The simple formation of a leaf spring, a key guide and the key stem comprising the switch enables these parts also to be assembled by machine, making the manufacture of a keyboard simple and inexpensive.
Abstract:
A key operated switch for keyboards having a layer type construction of key support carrying printed circuits arranged to facilitate fully automatic production of keyboards. Further, the simple formation of a leaf spring, a key guide and the key stem comprising the switch enables these parts also to be assembled by machine. The simple and hence inexpensive manufacture of a keyboard utilizing the key operated switches causes no loss of operating quality.
Abstract:
Two carriage drive systems are arranged to be selectively coupled to a uniform stepping mechanism responsive to spacing signals whereby a carriage can be indexed across a writing line at 10 or 12 pitch increments.
Abstract:
A type carrier arrangement for producing a roller print, which includes a continuously rotating type drum having arranged thereon a plurality of type carriers respectively carrying one type. Each type carrier has one gear segment arranged thereon for producing a rolling print. This print is brought about by a control member in cooperation with a gear segment associated with the printing area and not rotating with the type drum. The gear segment of the type drum includes a guiding section formed by the omission of a tooth. After the gear segment has meshed with the tooth segment designed as inner tooth segment, the guiding section is held by fixing means in the starting position thereof. The control means is designed as pawl controlled to act upon a ratchet tooth on the type carrier shaft so that the gear segment is turned in the direction toward the inner tooth segment. Each type shaft comprises in one cross-sectional plane at least two types offset relative to each other at an angle. The types are adapted by stationary pawls arranged in conformity with the type-offset selectively to be caused to print. The tooth spaces of the inner tooth segments correspond to the total of the number of teeth of the gear segment and the number of teeth of the maximum type-offset.
Abstract:
A reversing device for the longitudinal advance of a ribbon on type printers for the alternating drive of two reels by means of a feed shaft which is selectively drivingly connectable to one of the gears respectively connected to the reels for the ribbon. The drive from the respective winding-up reel to the respective unwinding reel is reversible by a feeler lever controlled by the ribbon coil, by a second lever adapted to be controlled by the feeler lever while being displaceably guided by an interengaging pivot-slot arrangement, and by an eccentric rotating in synchronism with the feed shaft. The eccentric is arranged on a stationarily journalled drive shaft continuously drivingly connected to the feed shaft. The displaceable second lever is designed as a pendulum lever displaceable about perpendicularly to the longitudinal axis of the feed shaft and is pivotal about parallelly to the longitudinal axis of the feed shaft. The pendulum lever comprises a pin engaged by the feeler lever for the longitudinal displacement thereof and also comprises two abutments which for purposes of reversing the transporting direction selectively cooperate with one of two abutments on the feed shaft for an axial displacement thereof.