Browse Prior Art Database

Servo Pulse Generator

IP.com Disclosure Number: IPCOM000094634D
Original Publication Date: 1965-Apr-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 3 page(s) / 69K

Publishing Venue

IBM

Related People

Arrington, WM: AUTHOR [+2]

Abstract

The apparatus and circuit generates pulse sets having variable spacing as well as plural pulse sets for record media stepping and processing equipment. Tape 1 is engaged with sprocket wheel 2 that is driven through gears 3 and 4 by stepping motor 5. Mounted on shaft 6 concentrically with sprocket 2 is emitter 7 having outer shell 8 that encloses a number of operating elements. Positioned internally of shell 8 is fixed inner shell 9 that has permeable teeth 9a spaced about its periphery. Shell 9 faces fixed shell 10 that has correspondingly arranged permeable teeth 10a. Teeth 9a and 10a have a width of five mils and the spacing between successive teeth is 25 mils.

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Servo Pulse Generator

The apparatus and circuit generates pulse sets having variable spacing as well as plural pulse sets for record media stepping and processing equipment. Tape 1 is engaged with sprocket wheel 2 that is driven through gears 3 and 4 by stepping motor 5. Mounted on shaft 6 concentrically with sprocket 2 is emitter 7 having outer shell 8 that encloses a number of operating elements. Positioned internally of shell 8 is fixed inner shell 9 that has permeable teeth 9a spaced about its periphery. Shell 9 faces fixed shell 10 that has correspondingly arranged permeable teeth 10a. Teeth 9a and 10a have a width of five mils and the spacing between successive teeth is 25 mils. Arranged for rotation on shaft 6 in cooperation with shells 9 and 10 and separated by an air gap from shells 9 and 10 is rotor member 11 that has flux conducting inserts 11a. These are wide enough to span the teeth in both shells 9 and 10 as rotor 11 rotates. Also incorporated in emitter 7 is permanent magnet 12 that is concentrically mounted within spooled coil 13. Magnet 12 provides a magnetic field with the flux path following from magnet 12 to inserts 11a crossing the air gap to teeth 9a and 10a and returning through the shells to magnet 12. The rotation of inserts 11a past the teeth in shells 9 and 10 as indicated at b causes flux changes in coil 13 with outputs from leads 14a and 14b. Coil 13 is incorporated in a circuit as indicated by dashed line 15. Certain of the mechanical relationships of the parts of the emitter as well as the pulses developed by it are shown at c, d, and e.

Initially, single-shot 16 is inactive. The Not single-shot line 17 conditions And 18 to supply an output to Motor Driver circuit 19 upon the occurrence of a Step Command on line 20. This initiates rotation of motor 5 through the bifilar winding
21. By gearing 3 and 4, tape 1 is stepped one increment in a particular direction, such as the forward direction. As tape 1 is stepped, rotor 11 al...