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Adjustable Electromagnetic Brake

IP.com Disclosure Number: IPCOM000085069D
Original Publication Date: 1976-Feb-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 2 page(s) / 43K

Publishing Venue

IBM

Related People

Stafford, DW: AUTHOR

Abstract

An electromagnetic brake for use on lead screw escapement systems is shown for a typewriter. This brake would be used on the lead screw 16 to rapidly slow the motion of the carrier at the end of tabs and carrier returns. The brake consists of an electromagnet 10 which when energized pulls a plate 12 (brake shoe) into contact with the magnet yoke 14. The friction between the brake shoe 12 and yoke 14 produces the braking torque, which is transmitted to the lead screw 16 by the brake shoe collar which is setscrewed to the lead screw shaft.

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Adjustable Electromagnetic Brake

An electromagnetic brake for use on lead screw escapement systems is shown for a typewriter. This brake would be used on the lead screw 16 to rapidly slow the motion of the carrier at the end of tabs and carrier returns. The brake consists of an electromagnet 10 which when energized pulls a plate 12 (brake shoe) into contact with the magnet yoke 14. The friction between the brake shoe 12 and yoke 14 produces the braking torque, which is transmitted to the lead screw 16 by the brake shoe collar which is setscrewed to the lead screw shaft.

Due to variations in magnet force and the coefficient of friction between the shoe 12 and yoke 14, wide variations in braking torque can occur. One way to compensate for these variations is to adjust the magnet force by varying the air gap 18 between the magnet core 14 and brake shoe 12. This can be accomplished simply by moving the core axially by a screw 20 and locking it in place with a nut 22. This technique allows each brake assembly to be adjusted to allow for the many production variables, and also makes it possible to perform adjustments on machines when the brake shoe 12 and yoke 14 wear.

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