Abstract: Methods of and apparatus for controlling a startup process of a wire insulating line until a desired outside diameter of an insulated wire is obtained. A startup control apparatus according to the invention comprises an extruder for supplying an insulating material around a core conductor, a take-up device for taking up the insulated wire, a diameter measuring device for measuring an outside diameter of the insulated wire and a processor for monitoring and controlling the line startup process. In a method of controlling the startup process of the wire insulating line, the processor calculates a target speed ratio r between the extruder and take-up device, performs a first correction in which a demanded take-up speed CA' is increased by a predetermined increment .DELTA.CA if a measured wire diameter D is equal to or greater than a target wire diameter D.sub.0, followed by a second correction in which a demanded extruder speed EX' is increased by a predetermined increment .DELTA.

Abstract: A slide driving device for use in a metal working press having an eccentric sheave capable of effecting an eccentric rotation and an oscillating link member adapted to oscillate in response to the eccentric rotation of the eccentric sheave. A slide of the metal working press is connected with the oscillating link member through a connecting rod. The eccentric sheave is adapted to be eccentrically rotated at uneven angular velocities so that the downwardly moving speed of the slide is reduced relative to the operating speed of the press which is supplied with power from the driving power source.