Browse Prior Art Database

Curve Reader and Converter

IP.com Disclosure Number: IPCOM000097699D
Original Publication Date: 1961-Apr-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 54K

Publishing Venue

IBM

Related People

Edgington, GE: AUTHOR [+2]

Abstract

A web of paper 10 bearing a continuous curve 11 is fed at a constant rate relative to a reading station 12 by means of pairs of feed rolls 13 and 14. A light source 16 is disposed at 12 so that light waves are directed onto a scanning disk 17 having a spiral slot 18. Slot 18 extends from near the center of 17 to a point further out from the center. Web 10 is positioned between 17 and a photo-sensitive device 19. A cap 20 is attached to the end of 17 facing 10 and is provided with a slot 21. Disk 17 is rotated in a manner such that the light waves from 16 reach 19 when slot 18 is coincidental with the slot 21. As 17 rotates with a constant angular velocity, the point of coincidence moves toward the center of 17 at a constant velocity along the slot 21.

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Curve Reader and Converter

A web of paper 10 bearing a continuous curve 11 is fed at a constant rate relative to a reading station 12 by means of pairs of feed rolls 13 and 14. A light source 16 is disposed at 12 so that light waves are directed onto a scanning disk 17 having a spiral slot 18. Slot 18 extends from near the center of 17 to a point further out from the center. Web 10 is positioned between 17 and a photo-sensitive device 19. A cap 20 is attached to the end of 17 facing 10 and is provided with a slot 21.

Disk 17 is rotated in a manner such that the light waves from 16 reach 19 when slot 18 is coincidental with the slot 21. As 17 rotates with a constant angular velocity, the point of coincidence moves toward the center of 17 at a constant velocity along the slot
21.

Disk 17 is fixed to the end of a shaft 22 which is driven in any suitable manner. Cam 23, fixed to shaft 22, operates a pair of normally open contacts C1 once per revolution of 17. Contacts C1 are connected between a supply voltage V and the ON terminal of Gate 24. Impulse generator 25 generates impulses which are passed by 24, when on, to binary counter 26. Normally open contacts C1 are closed by 23 at the moment the slot 18 begins to sweep across the web of paper 19 to scan curve 11. The closing of C1 turns 24 on to permit impulses from 25 to pass to counter 26.

Light waves coming from 16 are cut off from 19 when the relative opaque line of 11 is coincident with the point of coincidence...