Method of and machines for treating webs of photographic materia

Details Method of and machines for treating webs of photographic materia Method of and machines for treating webs of photographic materia

1989-09-29

1990-10-30

Mathews, A. A.

Advancing material of indeterminate length

By intermittent material-mover

Comprising material-moving roll

354298, 354322, 226108, 226119, G03D 313

Patent

active

049672223

ABSTRACT:
A web of spliced-together exposed photographic films is introduced into a developing machine at a variable speed. In order to ensure that each increment of the web is treated in the developing tank of the developing machine for an optimum interval of time, the speed of web advancing rolls at the inlet of the developing tank is monitored and the thus obtained signals are used to regulate the speed of advancing rolls at the outlet of the developing tank in such a way that the two speeds match but the speed of advancing rolls at the outlet is changed to conform to changed speed of advancing rolls at the inlet with a delay corresponding to the optimum interval of time. The length of that portion of the web which extends between the two sets of advancing rolls is varied simultaneously with changes of the speed of advancing rolls at the outlet.

REFERENCES:
patent: 3913119 (1975-10-01), Pfeifer et al.
patent: 4260234 (1981-04-01), Burton
patent: 4304484 (1981-12-01), Mizuta et al.
patent: 4621970 (1986-11-01), Wurfel
patent: 4643371 (1987-02-01), Wurfel et al.
patent: 4732278 (1988-03-01), Zangenfeino et al.
patent: 4782354 (1988-11-01), Gregoris
patent: 4888613 (1989-12-01), Zangenfe
patent: 4894675 (1990-01-01), Wurfe et al.

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