Viscous Fine-Wire Driver
Original Publication Date: 1984-Aug-01
Included in the Prior Art Database: 2005-Feb-04
A fine-wire driver applies a constant force, under conditions of varying axial velocity, to prevent wire damage. If wire speed is changed by an external device, a nearly constant force can be maintained at the exit because of the low inertia of the device. The wire 1 enters the pressure chamber 2 through a hole just slightly larger than the wire 3 and passes through TEFLON* tubing of a larger diameter 4. Air is supplied to the pressure chamber through the air inlet 5 and flows through the TEFLON tubing and exits at the left 6. A driving force is applied to the wire by means of the viscous drag exerted by the air as it flows along the wire inside the TEFLON tube. * Trademark of E.I. du Pont de Nemours & Co.