( 14563 of 14564 ) |
United States Patent | 3,581,183 |
Piazza , et al. | May 25, 1971 |
A character indicator system for sequentially displaying data and having means to monitor the characters indicated to thereby determine the correctness of the display. The character carriers are advanced by a step-by-step motor which advances one step for each alternation of the input energy. The monitor means, as a function of the position of the character carrier or the motor armature, affects at least one alternating current signal whose frequency lies within the order of magnitude of several times the frequency of the energy used for driving the motor. Switch means feed the alternating current signal to the motor input where it can be picked up at the other end of the input and used for monitoring purposes.
Inventors: | Piazza; Gian-Franco (Solothurn, CH), Streit; Rudolf (Solothurn, CH), Ulrich; Martin (Frankfurt am Main, DT), Laber; Werner (Mainflingen, DT), Burkert; Adolf (Walldorf, DT), Tron; Manfred (Walldorf, DT), Waluga; Wolfgang (Frankfurt am Main all of, DT) |
Assignee: |
Autophon Aktiengesellschaft
(Solothurn,
CH)
|
Appl. No.: | 05/007,686 |
Filed: | February 2, 1970 |
Current U.S. Class: | 318/696 ; 318/653 |
Current International Class: | H02K 29/06 (20060101); H02K 37/16 (20060101); H02K 37/12 (20060101); H02k 037/00 () |
Field of Search: | 318/138,254,676,32,685,696,650,651,653 |
3209586 | October 1965 | Tohyama |
3346792 | October 1967 | Noumi |
3412393 | November 1968 | Watkins |
3457481 | July 1969 | Riley |