Advancing material of indeterminate length – Threading device
Patent
1973-09-12
1976-03-30
Schacher, Richard A.
Advancing material of indeterminate length
Threading device
226196, B65H 2304
Patent
active
039469220
ABSTRACT:
A photographic copying machine wherein the leader of a fresh web of photographic paper is automatically threaded through a copying station and thereupon through one or more additional stations whereby the leader advances along an elongated path which is defined by stationary and pivotable guide members. Each pivotable guide member is movable by an electromagnet between an operative position in which it overlies at least a portion of an opening provided by the adjacent stationary guide member or members and an inoperative position in which the respective opening is exposed. Pivotable guide members are provided at a copying station where the web is exposed to printing light and at a feeding station where the web can form one or more loops in a suitable magazine when the respective pivotable guide member is moved to its inoperative position. One or more pivotable guide members can be yieldably retained in the respective operative positions by elastic or yieldably mounted locking bolts at least one of which can be disengaged from the respective pivotable guide member by an electromagnet or in response to the application of a predetermined force which acts against the respective pivotable guide members in a direction to move it to the inoperative position.
REFERENCES:
patent: 1079108 (1913-11-01), Chipperfield
patent: 2714512 (1955-08-01), Reed
patent: 3743153 (1973-07-01), Moss
IBM Tech. Disclosure Bulletin, Vol. 14, No. 4, Sept. 1971, R. B. Crawford, "Automatic Feed Mechanism."
Dreher Karl
Fleck Adolf
Gotze Christian
Heidrich Gunther
Agfa-Gevaert AG
Schacher Richard A,.
Striker Michael J.
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