Patent ID: 7073362
Filing Date: 2006-07-11
Classification: B21B

Abstract:
1. A drive for reciprocating a roll stand of a pilger cold-rolling system, the drive comprising: a crank shaft defining an axis transverse to a reciprocation direction of the stand; a crank-shaft gear fixed on the crank shaft and positioned on a weight plane substantially perpendicular to the axis; a crank on the crank shaft and rotatable therewith about the axis; a tie rod having an outer end journaled on the stand and an inner end eccentrically journaled on the crank, whereby rotation of the crank shaft reciprocates the stand in the direction; a compensating weight fixed eccentrically to the crank opposite the tie rod and orbiting in the weight plane on rotation of the crank; a single counterweight shaft offset along the plane from the crank shaft and substantially parallel thereto; a counterweight gear fixed on the counterweight shaft and positioned on the weight plane; a single counterweight fixed eccentrically on the counterweight shaft and offset along the weight plane from the crank, one of the weights being integrally formed with the respective gear; and drive means connected to the counterweight shaft for rotating same and for thereby synchronously orbiting the counterweight and the compensating weight in the weight plane.