Patent GB-1301975-A (GB)
IPC: B41J25/08
Filed: 1971-04-19
Abstract: 1301975 Selective printing SIEMENS AG 19 April 1971 [4 March 1970] 22877/71 Heading B6F [Also in Division H4] A key operated teleprinter has four type groups set up by movement of type lever carriage combined with platen movement. Each type group is assigned a shift key which performs corresponding movement of carriage and/ or platen on initiation of a code group, the signals resulting from operation of two of the keys 1b, Ab being followed by an "empty" signal. The keys 1b, Ab are each assigned a shift bar, movement of which operates on a common pushrod to set up a group shift symbol in a transmitting store which also stores the "empty" signal which may comprise five 1's or 0's. In an arrangement described the rotating pin transmitting store 2 is set up by operating key 1b displacing shift bar 3 leftwards against force of a spring 3a. Through members 4, 6, 22 a pivoted yoke 5 is displaced rightwardly between cam 23 and pivoted lever 8 articulatedly connected to a ratchet lever 9 by push rod 12. When control shaft 10 and cam 7 rotates, lever 8 is displaced against action of a spring 11 by the cam 7 so that store drum 2 is advanced one tooth of a ratchet wheel by pawl 9a. Store 2 carries radially displaced spring- loaded pins 2a arranged for example in twelve rows of five pins, each row representing one symbol. Push-rod 12 has its tip 12a in contact with pin 14a of another yoke 14 which during the feed motion of lever 9 is rotated together with a lever 15 until the central storage pin of the row of the keying position is depressed by tip 15a during the advancing of drum 2 hence the element group, corresponding to "change to numbers" function, is stored. Subsequently during this same rotation of shaft 10, the group for the "empty" combination is stored in the next pin row. In manner known per se by corresponding setting of five transmitting selector bars associated with keying elements belonging to the next row of storage pins 2a the elements are displaced towards the rear until the end 28 of each element passes beneath a storage pin 2a. Shortly before lever 9 completes its motion, extension 12b strikes an adjustable stop 17 arresting its motion hence with further pivoting of lever 9 rod 12 rotates anticlockwise hence tip 12a releases yoke 14 so that spring 18 returns lever 15 to its rest position which ensures that with continuing storage of symbols the centre pin is not depressed every time. Subsequently ratchet lever 9 is locked by roller lever 29 hence with further printing of symbols in this group the drum is not advanced by lever 9. If type group Ab is required this key is depressed displacing spring-loaded shift bar 20 rightwardly pivoting a lever 24 and displacing rod 26 leftwardly hence tab 5a of yoke 5 is displaced beneath a lever 25 coupled through shaft 23 to an additional ratchet lever 26, hence advancing drum 2 by one tooth without a pin being depressed which consequently stores five marking elements, e.g. "change to letters" and subsequently during the same rotation of control-shaft 10 the "empty" combination is stored in the next row of pins. The operations relating to the juxtaposition. ing of type lever carriage and the platen are described in detail in connection with Figs. 3 and 4 (not shown).