Typewriting machines – Key reassignment – Electrically powered
Patent
1940-02-05
1978-11-07
Feinberg, Samuel
Typewriting machines
Key reassignment
Electrically powered
35 4, 178 81, B41J 766
Patent
active
041243110
ABSTRACT:
1. A ciphering unit mechanism, comprising a rotatable cam sleeve provided th a plurality of cams, a clutch engageable to effect driving of said sleeve, a plurality of character keys, a swingable bail operable by all of said keys connected to release said clutch to engage with said sleeve, a plurality of coaxial drums mounted for independent step-by-step rotation, each said drum having on each face a number of contacts equal to the number of said keys with the contacts on one face randomly connected to those on the other face, a fixed member between each two drums having means to connect each said contact on the adjacent face of the drum on one side of the fixed member to a contact on the adjacent face of the drum on the other side, each said drum having a circumferential series of teeth equal in number to said contacts, an individual circuit closable by each said key connected to some one of said random circuits; an operating mechanism for each of said drums, including a rotatable wheel having a circumferential series of teeth and a series of longitudinally slidable pins disposed parallel to the axis of said wheel and equal in number to the teeth thereon, two pawls respectively engaging the teeth on said drum and said wheel, a longitudinally reciprocable push bar operatively connected to both said pawls, the forward portion of said bar being pivoted on the after portion thereof for vertical movement and having a forwardly facing shoulder and a rearwardly extending finger, a conditioning lever pivoted intermediate its ends having at its lower end a stud positioned to contact said finger and raise the said forward portion when said lever is latched and permit said portion to drop when said lever is unlatched, said lever having a rearwardly facing latching shoulder intermediate the pivot and the upper end of said lever, a pivoted latch having a forwardly extending arm to engage said latching shoulder to hold said lever in latched position and a rearwardly extending arm, a roller arm pivoted at one end, a roller carried by said arm to contact said pins, a translating lever pivoted at one end to the free end of said arm and slidably supported at its other end and having a latching projection on its upper side, a latching pin on said conditioning lever engageable by said projection to latch said lever, means to retract said translating lever and hold said roller in the path of such of said pins as are in one position, a bail actuatable by a cam on said sleeve to swing said translating lever up when said roller is riding over a said pin, means actuated by said translating lever to release a said latch and free the lever, controlled thereby to raise the forward portion of a push bar associated with such lever, and an operating bail actuated by a cam on said sleeve to engage the shoulders on all push bars thus raised and thereby to rotate one tooth each the drum and wheel associated with each said push bar raised as aforesaid.
REFERENCES:
patent: 1861857 (1932-06-01), Hebern
patent: 2116683 (1938-05-01), Lemmon et al.
patent: 2116732 (1938-05-01), Noll
patent: 2116733 (1938-05-01), Noll
Feinberg Samuel
The United States of America as represented by the Secretary of
Utermohle John R.
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