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Suppressing Bouncing Caused by Impacts

IP.com Disclosure Number: IPCOM000095701D
Original Publication Date: 1964-May-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 30K

Publishing Venue

IBM

Related People

Balle, E: AUTHOR [+3]

Abstract

When testing keyboards, the keys are actuated by a rubber plug during the operating stroke of an electromagnetic arrangement. When that arrangement is turned off, it must be insured that the respective key is not actuated several times by the transient process of the arrangement.

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Suppressing Bouncing Caused by Impacts

When testing keyboards, the keys are actuated by a rubber plug during the operating stroke of an electromagnetic arrangement. When that arrangement is turned off, it must be insured that the respective key is not actuated several times by the transient process of the arrangement.

Coil core 1 is displaceably mounted on pin 2, a screw 3 and a shoulder 2a serving as stops. In the inoperative state, coil spring 4 maintains the entire arrangement in the position shown. Pin 2 is guided in base plate 5, a key being operated by rubber plug 6 fixedly connected to pin 2. When a current flows through magnet coil 7, coil core 1 is accelerated together with elements 2, 3 and 6 in the direction of the arrow. At the same time, spring 4 is tensioned. When the coil current is turned off, the restoring force of spring 4 reverses the movement of coil core 1, that movement being limited by shoulder 2b striking on base plate 5.

At this time, the kinetic energy of the system comprising pin 2, screw 3 and rubber plug 6 is converted into a change in shape of pin 2. In addition, coil core 1 moves toward nut 3 at the speed the system had when shoulder 2b struck on plate 5. By a proper selection of the mass of coil core 1 and of the free paths of the coil core, coil core 1 strikes on screw 3 at exactly the time when pin 2 is again accelerated in the direction of the arrow. The two energies act in opposite directions and the amplitudes of the transient...