GB929516A - Method and apparatus for straightening sheet metal - Google Patents

Abstract

929,516. Straightening. F. UNGERER. June 1, 1961, No. 19831/61. Class 83 (4). A method of straightening metal sheets includes measuring the deformations in a sheet to be straightened along several spaced tracks, summing the measurements along each track and accordingly adjusting the backing or support members of the rollers of straightening means. Straightening apparatus comprises upper rolls a arranged to intermesh with lower rolls b so as to flex and thus straighten sheet fed therebetween. The upper rolls a are backed by rolls c and the lower rolls b by rolls d individually adjusted by electric motors. A sheet 3 to be straightened is placed upon a table 1 and a sensing member 7 is moved longitudinally thereover by screw means 11. The sensing member 7 supports, on a cross-bar 9, a series of sensing elements 16 spaced across the sheet. Each element 16 has a wheel 20 at its lower end running along the sheet and at its upper end carries a tracer 21 marking a curve on a transversely fed paper 15. The tracer 21 could be a light beam and the paper 15 sensitized. The curves drawn by the tracers 21 are then optically sensed by electric means which preset time relays governing the feed of the electric motors for adjusting the supporting rolls d. In a modification, Fig. 3, the intermediate recording on paper 15 is omitted and a sensing wheel 20<SP>1</SP> moves a contact 27 to engage contacts 29 controlling a servomotor. In another modification, Fig. 4 (not shown), a rack reciprocated by a sensing wheel rocks pinions to drive an adjusting element of a time relay.