The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 26, 1977
Filed:
May. 20, 1976
Eberhard Escales, Munich, DT;
AGFA-Gevaert Aktiengesellschaft, Leverkusen, DT;
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.