Web feeding and collecting apparatus for photographic printers o

Winding – tensioning – or guiding – Coil holder or support – Spool or core

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Details

226 39, 226176, 242151, B65H 2310

Patent

active

040250059

ABSTRACT:
A photographic printer wherein a web of photographic paper is being withdrawn by advancing rolls stepwise from a supply reel and is fed toward a copying station where successive increments of the web are exposed to light during intervals of idleness of the advancing rolls. The copying station is followed by a loop former for the web, by two normally spaced-apart rollers which are located at the opposite sides of the path for the web, and by a motor-driven flangeless takeup reel. One of the rollers is coupled to a hysteresis brake and the other roller can be propelled toward the one roller by an electromagnet which is energized when the motor for the take-up reel is arrested whereby the rollers pinch the web with a force which prevents any slippage of the web. The motor is started and stopped when the size of the loop respectively reaches a preselected maximum and a preselected minimum value. If the inertia of the take-up reel is so high that the latter continues to rotate after stoppage of the motor and after the convolutions of the web are tightly packed thereon, the web rotates the rollers against the opposition of the brake which is adjustable to insure that the rollers begin to rotate before the web breaks. The brake brings about a controlled deceleration of the web and takeup reel to zero speed.

REFERENCES:
patent: 1263419 (1918-04-01), James
patent: 1910154 (1933-05-01), Eitzen
patent: 2099376 (1937-11-01), Shapiro
patent: 2202883 (1940-06-01), Yoder
patent: 2362920 (1944-11-01), Moore
patent: 3250488 (1966-05-01), Prager
patent: 3904145 (1975-09-01), Steinberger

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