GB279229A - Improvements relating to the production of dies for wire drawing - Google Patents

Abstract

279,229. Johnson & Nephew, Ltd., R., and Cliffe, P. Sept. 27, 1926. Perforating by forging.-Wire-drawing dies are made by driving a punch g into the die h by repeated blows of a mechanically operated hammer c which is automatically put out of action when the punch has penttrated to the required depth. The hammer is spring pressed at f and is raised with the press head e by a spring held bell crank k till the latter is tripped by a pendant tappet o contacting with a, fixed stop p. A second hammer s similarly actuated operates. through a striker t and lever u, an ejector r for discharging the punch from the die, the ejector mechanism being automatically engaged when the punch first contacts with the ejector r whereby the trip z is actuated and linkage 2, w, v is operated to release the hammer s and simultaneously to lock the hammer c in the inoperative position. A weighted hand lever j lowers the punch in order that the work may be centred in the holder i, release of the hand lever at the conclusion of the punching operation serving to reset the automatic mechanism. The punch may be rotated between successive hammer-blows. The punch hammer is independently brought into operation by a hand lever y.