Method and apparatus for regulating speed of a longitudinally moving fiber

US4702404A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Guenter Einsle · Munich, DE
• Ernst Mayr · Starnberg, DE

Key dates

• Filing date: Mar 13, 1985
• Grant date: Oct 27, 1987
• Expiry date: Mar 13, 2005

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B65H2701/31
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

A method and apparatus for precisely regulating the speed of movement of a sensitive fiber in a substantially contact-free manner. The method and apparatus may be used for applying a braking force to a fiber or for accelerating the fiber. The method and apparatus comprise providing at least two capillary tubes having bores of different inside diameters with the bores being axially aligned, introducing a flowing medium such as gas or a more viscous material into the interior of the capillary tubes to flow out the free ends with the majority of the medium flowing out the capillary tube having the larger diameter, moving the fiber axially through the two capillary tubes so that the flow of the medium in the bore of the capillary tube having the larger inside diameter creates a force applied in a direction of the flow to the fiber. If the fiber is moving in the direction of the flow, this force acts to accelerate the fiber and if the fiber is moving in the opposite direction, this force acts to decelerate the fiber.