Bell + Howell Company

Karavattuveetil G Rabindran

John R Flint

Kenneth L Guenther

Thomas J Faber

Jack S Abrams

Jerry W Clevenger

An improved printing apparatus for printing pre-selected indicia on an envelope or other documents to be placed on a transport raceway of an insertion machine.

Sheet feed hopper for insertion machine

A flow, or rotary type, microfilm recording apparatus for filming documents having a document transport means to move documents past an aperture area. An alternating current powered fluorescent lamp is employed for illuminating the documents in the aperture area. In order to adjust, set and maintain a substantially constant level of illumination in the aperture area and to reduce flicker, a lamp regulator circuit is provided which includes a shunted rectifier load circuit and a variable current device responsive to the illumination from the fluorescent lamp for varying the voltage drop across the shunt in accordance with the illumination.

Lamp regulator circuit for rotary camera

The disclosure relates to an automatic exposure control system for use in a document recorder of the type which makes a photographic reproduction of each of a series of documents and which has a document transport for feeding the documents along a predetermined path and an exposure station within the predetermined path including an exposure light source for illuminating each document as each document is presented to the exposure station to facilitate the photographing of the documents. The automatic exposure control system controls the illumination intensity of the exposure light source in response to the reflectivity of each document to assure proper exposure of each document. It includes a first light source arranged relative to the predetermined path in advanced relation to the exposure station relative to document travel for projecting light onto the documents, a first light sensitive element arranged relative to the predetermined path for receiving the light reflected from the documents originating from the first light source for providing a first control signal having a magnitude directly related to the intensity of the reflected light, a feedback arrangement coupled between the first light source and the first light sensitive element for controlling the intensity of the first light source in response to the first control signal to render the intensity of the reflected light received by the first light sensitive element substantially constant, and control means coupled to the exposure light source and responsive to the light output intensity of the first light source for controlling the illumination intensity of the exposure light source as each document is presented to the exposure station.

Growing community of inventors

Morton Grove, IL, United States of America

Karavattuveetil G Rabindran