Patent ID: 6070510
Filing Date: 2000-06-06
Classification: B23D,Y10T

Abstract:
A method to shear ends of a bar travelling through high-speed flying shears, the high speed flying shears comprising at least one pair of blade-holder drums defining a shearing area therebetween, the blade-holder drums rotating in opposite directions about spaced, parallel axes of rotation, the at least one pair of blade-holder drums being provide with first shearing blades and second scrap-shearing blades, the first shearing blades being laterally offset in a direction along said parallel axes from said second scrap-shearing blades;a first one-channel switch provided upstream of said at least one pair of blade-holder drums for conveying the bar lengthwise through said shearing area, said first one-channel switch being capable of being oriented laterally by rotation on a plane substantially containing an axis of travel of the bar and parallel to and between planes containing the axes of rotation of the at least one pair of blade-holder drums; anda second one-channel switch provided downstream of said at least one pair of blade-holder drums for conveying the bar lengthwise from said shearing area downstream to a coil forming headstock or winding unit, the second one-channel switch being capable of being oriented laterally by rotation substantially on the same plane of rotation as said first one-channel switch and in synchronization therewith;wherein a lateral orientation of said first and second one-channel switches is synchronized with a circumferential position of at least the first shearing blades on said at least one pair of blade-holder drums, the lateral orientation including a feed position (E) for feed of the bar adjacent the first shearing blades, and first (A-A') and second (D-D') extreme positions on opposed sides of the feed position (E), the feed position (E) being provided between the first shearing blades and the second extreme position (D-D'), wherein said method comprises:guiding the bar into the first one-channel switch, the first one-channel switch being in the first extreme position (A-A');displacing the first one-channel switch from the first extreme position (A-A') to said second extreme position (D-D') by passing through said shearing area in which a leading segment of the bar is sheared from the remaining bar by said first shearing blades; and thenreturning said first one-channel switch to said feed position (E).