Typewriting machines – Key reassignment – Electrically powered
Patent
1944-12-15
1980-01-29
Bentley, Stephen C.
Typewriting machines
Key reassignment
Electrically powered
G09C 308
Patent
active
041859286
ABSTRACT:
8. In a cryptographic machine having a keyboard, and coding circuits condonable for encipher and decipher operation: a printing device, means connecting said device to the keyboard through the coding circuits in one direction for enciphering and in the opposite direction for deciphering, and for connecting said device directly to the keyboard for printing plain text; means to feed to said device a tape upon which characters are to be printed, including a friction drive rotatable shaft, tape feed members driven by the shaft, three toothed wheels fixed on the shaft in abutting relation, a first one of said wheels having a continuous series of teeth, a second wheel adjacent thereto having two only diametrically opposite teeth higher than the teeth on the first wheel, and a third wheel adjacent the second having two equal groups of teeth with spaces equal to one tooth separating the groups and a first tooth in each group adjacent a said high tooth, a pawl slidably mounted to be engageable with any said toothed wheel to prevent rotation of the shaft while so engaged, the pawl being rockably mounted to be disengageable from a tooth of the first and third wheel each time a character is printed to permit rotation of the shaft, means to move the pawl to engage the first wheel for decipher and plain text writing, to engage the third wheel for encipher and to engage the second wheel during non-printing operation of the machine, and means actuated to disengage the pawl each time a character is printed.
REFERENCES:
patent: 418877 (1934-07-01), Hazelin
patent: 431987 (1890-07-01), McCay
patent: 892891 (1908-07-01), Richards
patent: 997285 (1911-07-01), Gammeter
patent: 1098545 (1914-06-01), Adams
patent: 1520089 (1924-12-01), Scherbius
patent: 1887401 (1932-11-01), Denton et al.
patent: 2105731 (1938-01-01), Graves
patent: 2366914 (1945-01-01), Le Clair et al.
Krum Howard L.
Thienemann Rolf A.
Bentley Stephen C.
The United States of America as represented by the Secretary of
Utermohle John R.
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