Patent · US Expired

Arrangement for and method of determining two or more superimposed film sheets

US4652742A · kind A · utility

11Cited by

5References

8Claims

0Family size

Assignee

Agfa-Gevaert NV · BE

Inventors

Dieter Wauer · Taufkirchen, DE
Herbert Plaschke · Gernlinden, DE
Otto Butz · Munich, DE
Josef Ganser · Munich, DE

Key dates

Filing date	Jan 24, 1986
Grant date	Mar 24, 1987
Priority date	—
Expiry date	Jan 24, 2006

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB65H2553/41
WIPO fieldHandling
WIPO sectorMechanical engineering

Abstract

An arrangement for determining two or more superimposed film sheets, particularly X-ray film sheets, in a transport after their withdrawal from the film sheet stack, has a light barrier with a light source at one side of the transport path and a photoreceiver at the other side thereof, and an evaluating circuit connected with the photoreceiver for producing a signal corresponding to the presence of two or more sheets and including a computer supplied with a value of the density of a first or test sheet introduced into the light barrier between the light source and the photoreceiver, so that the supplied value serves as a reference signal for measuring the next film sheet.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.