GB795849A - Improvements relating to machines for bending curved shapes - Google Patents

Abstract

795,849. Curving. HAUSLER, C. Oct. 16, 1956 [Dec. 14, 1955], No. 31462/56. Class 83 (4). A machine for bending curved shapes comprising a driven template roll a, which is carried in stationary bearings and around which a workpiece x is bent, an adjustable urging roll b, which is associated with said template roll a and which is also driven, and two bending rolls c, d which are arranged on the feed and rear sides, respectively, of the set formed by the rolls a, b, said bending rolls c, d being carried in journal bearings f1, f2 having oblique guides e1, e2 oppositely inclined relative to the plane containing the axes of the rolls a, b, is characterized in that said journal bearings f1, f2 are connected by lever and linkage means h, k, m, o to a drive means under control of means p, operated by a sensing lever r extending towards the roll a to initiate the operation of the drive means j when the lever r is actuated at the beginning of a bending operation by the leading end of the workpiece x, which is being bent with a substantial co-operation of the feed-side bending roller c, said operation of the drive means j causing the lever and linkage means to retract the bending roller c from its original position and at the same time to extend the rear-side bending roller d, which had not participated in the bending operation until that time, to such an extent as to cause said roller d to exercise the bending pressure for bending the workpiece. The drive means j comprises an hydraulic motor and the control means p a valve. The bell-crank h from the bearing f pivots about a fixed pin i and the link o from the bearing f 2 pivots on a pin n1 on a slide n adjustable on the rocker m which pivots on a fixed pin m1 and is connected by the link k. to the bell-crank h.