Browse Prior Art Database

Hand Control Unit with Digital Interface

IP.com Disclosure Number: IPCOM000089852D
Original Publication Date: 1968-Dec-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 4 page(s) / 76K

Publishing Venue

IBM

Related People

Alderman, NM: AUTHOR [+2]

Abstract

The system provides digital information related to the handle position of Control unit 10. Knob-shaped operator handle 11 is fixed to one end of rod 12. Flat disk-shaped guide plate 13 is symmetrically fixed to rod 12. Plate 13 is slidably mounted within stationary guide plate housing 14. The latter confines, i.e., restricts, its movement within a plane that is parallel to the X-Y datum plane of the system. Rod 12 is terminated by flexible coupling member 15 that connects rod 12 to pivot rod 16. Symmetrically fixed to rod 16 is hollow cylindrical-shaped bracket 17. Mounted on bracket 17 are four microswitches 18...21. The spring loaded actuator, e.g., actuator 22, of each switch faces rod 12 and is aligned in parallel with one of the direction axes +x, -x, +y, -y of the X-Y datum plane, drawing 8.

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Hand Control Unit with Digital Interface

The system provides digital information related to the handle position of Control unit 10. Knob-shaped operator handle 11 is fixed to one end of rod 12. Flat disk-shaped guide plate 13 is symmetrically fixed to rod 12. Plate 13 is slidably mounted within stationary guide plate housing 14. The latter confines,
i.e., restricts, its movement within a plane that is parallel to the X-Y datum plane of the system. Rod 12 is terminated by flexible coupling member 15 that connects rod 12 to pivot rod 16. Symmetrically fixed to rod 16 is hollow cylindrical-shaped bracket 17. Mounted on bracket 17 are four microswitches
18...21. The spring loaded actuator, e.g., actuator 22, of each switch faces rod 12 and is aligned in parallel with one of the direction axes +x, -x, +y, -y of the X-Y datum plane, drawing 8.

With handle 11 and rod 12 in the X and Y zero coordinate positions, switches
18...21 are in their normally open position. Initial displacement of handle 11 from the zero coordinate position causes one or two of switches 18...21 to be actuated, i.e., closed, by rod 12. The number of and the particular switches that are closed depends on the quadrature components of the particular direction vector of rod 12. Switches 18...21 generate enabling signals +X, -X, +Y, and -Y, respectively, when the particular switch is closed. Each enabling signal is indicative of the quadrature direction component being sensed by the particular switch. The X and Y enabling signals are fed to X and Y data channels 23 and 24 respectively.

Opto-electronic transducers 25 and 26 convert the analog positional information of handle 11 to signal pulses Xp and Yp. These are fed to data channels 23 and 24 respectively. For this purpose, rod 16 is mounted by pivot 27 normal to rotatable shaft 28. The lower end of rod 16 is terminated in segment-type gear 29 which drives sprocket gear 30. Shaft 28 is aligned in parallel with the X direction axes of the datum plane. Shaft 28 is rotatably mounted within bearing pair 31 and 32. Its plane of rotation is parallel to the Y direction axes of the datum plane. Gear 33 of gear train assembly 34 is fixed normal to shaft 28. In response to the rotation of shaft 28, optical mask 35 of generator 26 is driven by drive shaft 36 which is journaled in bearing 36a and which is connected to assembly 34. Light from lamp 37 is transmitted through mask 35 and through elongated slit 38 provided in the wall separating the upper and lower chambers 39 and 40 of stationary light box 41 which is fixed to a supporting frame not shown. Mounted in chamber 40 is photosensor 40a which senses the light emanating from slit 38. Transducer 25 is constructed similar to the transducer 26. Support assembly 42 is fixed to shaft 28 and to it the light box of transducer 25 is rigidly mounted. Gear 30 is connected to a drive shaft that drives the mask of transducer 25 in response to the pivotal movements of rod 16. This drive...