Browse Prior Art Database

Pneumatically Powered Magnetically Restored Actuator

IP.com Disclosure Number: IPCOM000079994D
Original Publication Date: 1973-Oct-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 2 page(s) / 23K

Publishing Venue

IBM

Related People

Bardo, GB: AUTHOR

Abstract

Electromagnetic actuators generally require high-current power supplies in multiple actuator applications, as for example in impact printers. Pneumatic power used as a driving source, reduces the cost of power supplies. Also, impact force is easily adjusted and the pneumatic power source can be located remotely and shared by several units.

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Pneumatically Powered Magnetically Restored Actuator

Electromagnetic actuators generally require high-current power supplies in multiple actuator applications, as for example in impact printers. Pneumatic power used as a driving source, reduces the cost of power supplies. Also, impact force is easily adjusted and the pneumatic power source can be located remotely and shared by several units.

The drawing shows a pneumatically powered magnetically restored actuator
10. An airtight cylinder 12 carries slidable magnetic piston 14. Pneumatic pressure is applied to cylinder 12 to drive magnetic piston 14 against impact surface 16. When pneumatic pressure is removed, magnet 18 pulls magnetic piston 14 back to an original position.

Several variations are possible with the basic structure. For example, an exhaust hole in cylinder 12 combined with a constant pneumatic pressure source will result in piston 14 oscillating between two position, one of which is above the exhaust hole and the other of which is below the exhaust hole.

Another variation is the addition of a magnetic keeper or pole piece on contact or close proximity to magnetic piston 14, which will permit buck-boost electromagnetic control by a small coil.

Also, a reversal of the magnetic flux in an electromagnet replacing permanent magnet 18, will allow added force in the primary movement to create a slingshot effect.

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