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Mechanism for Adjusting Positions of Magnetic Pickups

IP.com Disclosure Number: IPCOM000090697D
Original Publication Date: 1969-Jun-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 37K

Publishing Venue

IBM

Related People

Fournier, TR: AUTHOR [+2]

Abstract

The mechanism allows manual adjustment of magnetic pickups 10 and 11. These are respectively carried by holding members 12 and 13 pivotally mounted about shaft 14. This has gearing 15 fixed on it. Pickups 10 and 11 have a magnetic core 16 disposed in close proximity to the ends of the gear teeth so that a voltage is set up in each pickup as a gear tooth passes its core. Member 13 is adjustably fixed with respect to member 12 by locking screw 17 screwed into member 12 and extending through slot 18 in member 13. Bell crank 19 is pivoted at 20 and has a pin and slot connection 21 with member 12. Screw 22 extends through shaft 23 carried by bell crank 19. Screw 22 is held from axial movement by fixed retainer plate 24 which embraces screw 22 within a slot provided in it.

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Mechanism for Adjusting Positions of Magnetic Pickups

The mechanism allows manual adjustment of magnetic pickups 10 and 11. These are respectively carried by holding members 12 and 13 pivotally mounted about shaft 14. This has gearing 15 fixed on it. Pickups 10 and 11 have a magnetic core 16 disposed in close proximity to the ends of the gear teeth so that a voltage is set up in each pickup as a gear tooth passes its core. Member 13 is adjustably fixed with respect to member 12 by locking screw 17 screwed into member 12 and extending through slot 18 in member 13. Bell crank 19 is pivoted at 20 and has a pin and slot connection 21 with member 12. Screw 22 extends through shaft 23 carried by bell crank 19. Screw 22 is held from axial movement by fixed retainer plate 24 which embraces screw 22 within a slot provided in it. Screw 25, extending through slot 26 in member 12, is used for fixing member 12 in the desired position. The positions of members 12 and 13 and pickups 10 and 11 can be adjusted together by rotating screw 22 in one direction or the other which causes bell crank 19 to pivot about pivot 20. A clockwise rotation of bell crank 19 causes counterclockwise rotation of members 12 and 13 and magnetic pickups 10 and 11 and vice versa. Pickups 10 and 11 are respectively held in mounting blocks 27 and 28 carried by holding members 12 and 13. Blocks 27 and 28 have flexible portions 27a and 28a tightened by screws 29 on pickups 10 and 11 to allow axial adjustmen...