GB762230A - Machine for shearing or forming sheet metal work - Google Patents

Abstract

762,230. Shearing; angular bending. CARDELL, O. May 14, 1954, No. 14201/54. Class 83 (4). [Also in Group XXVI] In a machine for shearing or bending sheet metal having a frame with upper and lower arms supporting a reciprocating and a stationary tool, respectively, the moving tool is actuated by a cam reciprocated transversely between the upper tool holder and an abutment by a motordriven eccentric which is adjustable to vary the reciprocation of the moving tool. The tool-holder 60 carrying the moving tool 30 is slidably and non-rotatably mounted in a sleeve 70 secured to the upper arm 12 of the C-shaped cast or fabricated frame 10. The opposed surfaces of the cam on the arm 80 of the eccentric 82, the abutment 92 and the tool holder 60 are concave and spaced apart by balls or rollers 98 and springs 68 urge the tool holder 60 upwardly. The abutment 92 is adjustable by a three-position cam 100 actuated by a lever 102. The driving-shaft of the eccentric 82 is carried in brackets which are pivotally or slidably mounted in the frame 10 so that the shaft can be adjusted longitudinally of the arm 80 to positions in which the tool 30 is reciprocated once or twice during each revolution of the shaft. An electric motor 84 driving through a belt the shaft of the eccentric 82 is carried on a hinged flap 133, the position of which may be varied by bolts 135 to tension the belt. In order to vary the stroke of the tool a variable eccentric, Figs. 6 and 7, may be used. Between the eccentric strap connected to the rod and the driving shaft 120 are interposed eccentric sleeves 124; 130. The larger sleeve 130 has a projecting portion having flats 136, 138 and the smaller sleeve 124 in which the shaft 120 is secured has a projecting arm 128. In dependence on the direction of rotation of the shaft 120, the arm 128 engages one of the flats 136, 138 so that the effective eccentricity of the eccentric is either the sum of or the difference between the eccentricities of the sleeves 124, 130. The lower tool 28 is secured in a holder 20 and rests on a bolt 33, the position of which is alterable. The holder 20 is clamped in a split rod 16 which is secured in a split socket 15 in the lower arm 11. A locating pin 44 engages with one of a number of slots in the rod 16. The shearing tools may be replaced by bending dies 140, 142, Figs. 8 and 9. An adjustable and rotatable work clamp 114 is secured between the arms 11, 12 of the frame 10.