Blast of gas blows a loop of unexposed film as a wave across a vacuum platen to feed film smoothly into a camera so that 2 successive lengths can be exposed within 50 milliseconds. This technique can be readily applied to multiple aperture cameras as well as to various types of films

Keigher, P. J.

English

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AEC-NASA TECH BRIEF e rc
Brief 66-10474 November 1966 
ICY Co., 
US
AEC-NASA Tech Briefs describe innovations resulting from the research and development program 
of the U.S. AEC or from AEC-NASA interagency efforts. They are issued to encourage commercial 
application. Tech Briefs are published by NASA and may be purchased, at 15 cents each, from 
the Clearinghouse for Federal Scientific and Technical Information, Springfield, Virginia 22151. 
Gas Pressure Feeds Film into Camera at High Speed 
Unexposed Loop 
of Film 
--' 
/	 \	
I 
I	
I I	 g	
I 
I	 I	
I, I	 I	
I, I	
I' 
__________L-,, 
•• ___________________________ / 
Film 
TaKeup	
Apeure	
Vacuum Platen
(Glass)
Me n—s  I
Pressure 
Supply
Gas Line 
and Nozzle 
The problem: 
To feed film smoothly into a camera so that 2 
successive lengths can be exposed within 50 millisec-
onds. An existing mechanical changer which operates 
at 50 milliseconds is complicated and can rip or 
scratch the film. 
The solution: 
A blast of gas blows a loop of unexposed film as 
a wave across a vacuum platen, thereby picking up 
exposed film and laying down new film. 
How it's done: 
Each length of film is held to the platen by vacuum 
holes around the platen aperture. A loop of unexposed 
film is unreeled from a film supply so that it stands 
directly in front of a gas manifold and on one side 
of the platen. After the first length of film is exposed, 
a blast of gas (air, nitrogen, etc.) from the manifold 
blows the standing loop as a wave across the platen.
The moving wave of film breaks the vacuum, laying 
down unexposed film on the platen and carrying away 
exposed film to a take-up reel. 
Notes: 
1. This technique can be readily applied to mulitple 
aperture cameras as well as to various types of 
films. 
This technique should eventually be capable of 
2. allowing two successive lengths of film to be ex-
posed within 25 milliseconds of one another. 
3. Inquiries concerning this innovation may be di-
rected to: 
Office of Industrial Cooperation 
Argonne National Laboratory 
9700 S. Cass Avenue 
Argonne, Illinois 60439 
Reference: B66-10474
(continued overleaf) 
-.
This document was prepared under the sponsorship of the Atomic 
Energy Commission and/or the National Aeronautics and Space 
Administration. Neither the United States Government nor any per-
son acting on behalf of the United States Government assumes any
liability resulting from the use of the information contained in this 
document, or warrants that the use of any information, apparatus, 
method, or process disclosed in this document may not infringe pri-
vately owned rights.
https://ntrs.nasa.gov/search.jsp?R=19660000473 2020-03-11T17:36:52+00:00Z
Patent status: 
Inquiries about obtaining rights for commercial use 
of this innovation may be made to: 
Mr. George H. Lee, Chief 
Chicago Patent Group 
U.S. Atomic Energy Commission 
Chicago Operations Office 
9800 S. Cass Avenue 
Argonne, Illinois 60439 
Source: P. J. Keigher
Particle Accelerator Division

(ARG-97)
. 
.. 
Brief 66-10474 Category 02


Gas pressure feeds film into camera at high speed

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