Improvements in or relating to devices for shearing metal bars

摘要

1,136,276. Sub - press mechanism. SCHOSTAL S.A. 17 May, 1966 [22 May, 1965], No. 21804/66. Heading B3W. A sub-set for shearing lengths from metal bars comprises a base 28, four guide columns 22, Fig. 2 (not shown), and a block 1 which supports a fixed shearing blade 20. A tool-slide 4 is vertically movable in the block and carries a shearing blade 21. The upper surface of the block engages a plate 2 which is guided on the columns 22 and is biased upwardly by compression springs 3 around the columns. The uppermost position of the plate 2 is determined by stops on the columns. Projecting upwardly from the slide 4 are plungers 18 which are acted on by compression springs, the plungers being engaged by the ram of an operating press which compresses the springs before it actuates the slide 4. The press slide is adjusted so that it moves the slide directly only through a distance sufficient to shear a bar (i.e. about 1/3 of its diameter) the stroke being completed, to detach the slug, by the expansion of the plunger springs. The bar to be cut is fed to a gauging stop 7 which is adjustable by a screw 29. The bar is inclined at an angle of 7-12 degrees to the path of movement of the slide 4 in order to provide clearance for the upper cutter. The bar is clamped on the feed side by two co-acting wedges 5 and 6 of which the wedge 5 is acted on by a spring indicated by the arrow 16. This spring is controlled by cams 12 rigidly connected to the plate 2, and is allowed to act on the wedge 5 shortly after the slide begins to compress the plunger springs. A second vertically movable cam 9 is then engaged by the press-slide and moves a support 8 under the bar against the effect of a spring 25. The cam 9 also has a slightly angled face 91 which moves the stop. 7 against the end of the bar. An ejector 10 is activated at the end of the downward movement of the cam 9, by engagement with an anvil 27.