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Mechanical Scanning Photo Responsive Card Reader

IP.com Disclosure Number: IPCOM000097497D
Original Publication Date: 1962-Dec-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 47K

Publishing Venue

IBM

Related People

Baumberger, J: AUTHOR

Abstract

The photoelectric apparatus senses punched cards fed either serially or in parallel and either synchronously or asynchronously.

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Mechanical Scanning Photo Responsive Card Reader

The photoelectric apparatus senses punched cards fed either serially or in parallel and either synchronously or asynchronously.

A card 10 is fed serially and asynchronously for instance, between transparent windows 11 and 12 under light source 13. Beneath window 12 is a hollow, rotatable cylinder 14 having light entrance holes arranged in a plurality of helical rasters 15, 16 and 17. Each entrance hole in a raster is spaced longitudinally of the cylinder to correspond with one of each of the possible columnar punch positions in the card and has a corresponding exit hole 180 degrees from it in the cylinder. Each exit hole directs light from the entrance hole, when exposed, through a corresponding lens 18 and aperture 19 to single photocell 20. To block light from all but the desired exit hole, an opaque disc 21 has transparent slots 22 each corresponding to one of the rasters of mating entrance and exit holes.

Holes are sensed by rotating cylinder 14 in synchronism with disc 21 once for each card column advanced so that each column is subject to scanning by three rasters. The leading edge of a punched card is detected and signaled as the first card column enters the sensing station. This signal is combined with a start of raster signal at And 23. The raster start signal is provided by photocell 24 and a hole at the start of each entrance hole raster such as 15a or 17a. Upon signal coincidence, And 23 produces a sign...