Apparatus for braking webs of photographic material or the like

Details Apparatus for braking webs of photographic material or the like Apparatus for braking webs of photographic material or the like

1976-05-20

1977-07-26

Saifer, Robert W.

Advancing material of indeterminate length

With material-responsive control means

To regulate longitudinal movement of material

226 33, B65H 2510

Patent

active

040377687

ABSTRACT:
Apparatus for transporting a perforated web of photographic material in stepwise fashion has a variable-speed motor which drives the web, a bundle of light conductors which receive light seriatim when a perforation of the web passes between their ends and a light source whereby the conductors transmit light to associated phototransistors which effect the transmission of different first signals at timely spaced intervals to a comparator amplifier which further receives a continuous signal from a tachometer generator driven by the motor. The amplifier gradually decreases the speed of the motor to zero speed which is reached when the last phototransistor receives light from the respective conductor. The phototransistors are connected with an input of the amplifier by Darlington transistors, flip-flops, additional transistors and a chain of resistors.

REFERENCES:
patent: 3581964 (1971-06-01), Betron et al.

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