Browse Prior Art Database

Positioning Mechanism

IP.com Disclosure Number: IPCOM000097654D
Original Publication Date: 1961-Mar-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 51K

Publishing Venue

IBM

Related People

Moore, RL: AUTHOR

Abstract

By controlling the movement of a work table 5 in two directions normal to each other by means of a pair of servo motors 6 and 6, this mechanism precisely positions a reference point 7 on an object 8 that is supported by the table. When 7 is properly positioned, suitable fabricating or other operations are performed on object 8 by equipment (not shown).

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Positioning Mechanism

By controlling the movement of a work table 5 in two directions normal to each other by means of a pair of servo motors 6 and 6, this mechanism precisely positions a reference point 7 on an object 8 that is supported by the table. When 7 is properly positioned, suitable fabricating or other operations are performed on object 8 by equipment (not shown).

A source 9 radiates light on object 8, and point 7 reflects light having a different characteristic or intensity from that of its surroundings. An optical system 10 forms an image II of object 8 on a rotating drum 12 of a sweep mechanism 13. The latter samples the light intensity across the field of view. To achieve this, three staggered rows of slots 14a, 14b and 14c are cut in 12. Scanning is accomplished first by 14a sweeping an area slightly below center of the field of view, then by 14b sweeping the center field. Finally, 14c sweeps an area slightly above the center field. Phototubes 15a, 15b and 15c and light sources 16a, 16b and 16c are associated with the three rows of slots in 12. They are employed to provide reference signals indicative of which one of the three sweeps is occurring at a given time.

Light from system 10 passes through one of the slots 14a, 14b or 14c and is reflected by prism 17. It is collected by lens 18 and focused on the cathode of photomultiplier tube 19. The light intensity applied to 19 and, hence, the magnitude of the output signal of that tube, varies in a determinable manner with the variations in the light reflected from different areas of 8. The output 19 is applied to a detector and recognition circuit 20. The latter develops a recognition signal for application to a position control unit 21 in response to the occurrence of predetermined combinations of li...