Browse Prior Art Database

Transport for Optical Mark Sense Scanner

IP.com Disclosure Number: IPCOM000090894D
Original Publication Date: 1969-Aug-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 66K

Publishing Venue

IBM

Related People

Lynott, JJ: AUTHOR [+2]

Abstract

Precise movement of a scanning mechanism in the X and Y directions is obtained with this transport. Card 10, bearing the information in lines of characters to be scanned, is laid face down on glass plate 12, indicated in phantom, supported above a table 14 by structure not shown. Scanner 20 travels beneath card 10 as it scans a line of characters. Scanner disks 22 and 24 rotate and dissect the image of card 10 while gear box assembly 26 glides on X travel rails 30 and 32. The line-to-line motion is obtained by sliding assembly 26 and X travel assembly 34 on Y travel rails 40 and 42. The Y travel motion is controlled by geneva drive 44. This transmits the line-to-line incremental motion by rack 46 and pinion 48. Drive 44 gives an exact displacement each time the Y travel motor makes one revolution.

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Transport for Optical Mark Sense Scanner

Precise movement of a scanning mechanism in the X and Y directions is obtained with this transport. Card 10, bearing the information in lines of characters to be scanned, is laid face down on glass plate 12, indicated in phantom, supported above a table 14 by structure not shown. Scanner 20 travels beneath card 10 as it scans a line of characters. Scanner disks 22 and 24 rotate and dissect the image of card 10 while gear box assembly 26 glides on X travel rails 30 and 32. The line-to-line motion is obtained by sliding assembly 26 and X travel assembly 34 on Y travel rails 40 and 42. The Y travel motion is controlled by geneva drive 44. This transmits the line-to-line incremental motion by rack 46 and pinion 48. Drive 44 gives an exact displacement each time the Y travel motor makes one revolution. Cams are used to control the operation of the geneva mechanism.

Imaging lens 56 focuses the image of the characters written on card 10 on disks 22 and 24. Below these is a preamplifier assembly not shown. This unit contains a collecting lens assembly that images the illumination generated by disks 22 and 24 on a photodiode. Smooth decelerations and accelerations as the mechanism reverses its travel reduces wear. Precise registration between card 10 and scanner 20 is provided by the separation of the drive assembly from the positioning mechanism. The drive is provided from belt 50 to which pin 52 is attached. Pin 52 engages slider...