Browse Prior Art Database

Line Spaced Document Viewer

IP.com Disclosure Number: IPCOM000093711D
Original Publication Date: 1966-Jan-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 3 page(s) / 111K

Publishing Venue

IBM

Related People

Terwilliger, HW: AUTHOR [+2]

Abstract

The apparatus projects a document for viewing and also projects a horizontal line marker that is stepped incrementally from top to bottom of the document. The marker stepping increments can be varied to correspond with the line spacing of the document. Provision is also made for canting the marker and for rapidly advancing another marker as the next document is projected.

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Line Spaced Document Viewer

The apparatus projects a document for viewing and also projects a horizontal line marker that is stepped incrementally from top to bottom of the document. The marker stepping increments can be varied to correspond with the line spacing of the document. Provision is also made for canting the marker and for rapidly advancing another marker as the next document is projected.

Cabinet 1 has shelf 2 for supporting projector 3. The latter accommodates a plurality of document slides 4 with an individual document slide, such as slide 5,being selected for projection by reflecting mirrors 6 and 7 to viewing screen 8 at the front of cabinet 1. The front of cabinet 1 also has a number of control elements including line adjustment knob 9, rapid advance pushbutton 10, single- step pushbutton 11, and step adjustment crank 12.

Horizontal marker wires 13a...13f are supported for movement adjacent the rear of screen 8 in a direction indicated by arrow 14. Wires 13a...13f are supported by chain belts 15 and 16 that are mounted on a number of pulleys 17a...17h and are driven under control of a single direction clutch assembly 18.

Stepping mechanism, lower left drawing, controls clutch assembly 18 to drive wires 13a...13f successive increments of travel that can vary, for example, from 0 to 3/5 of an inch. The stepping mechanism includes drive motor 19, second single revolution clutch 20, solenoid 21, adjusting screw 22, and links 23 and 24. Link 23 is connected to clutch assembly 18 by pin 25.

Wires 13a...13f are stepped by oscillation of pin 25. The extent of oscillation of pin 25 is determined by the relative positions of links 23 and 24 with respect to fulcrum 26 of adjusting screw 22. The relative positions of links 23 and 24 are changed by rotating crank 12 and moving bead chain 27....