GB1351837A - Metal working machinery - Google Patents

Abstract

1351837 Punching; shearing; bending EXCEL MFG Ltd 2 July 1971 [9 July 1970] 31215/71 Heading B3W and B3E In a punch press, a main beam 34 is pivoted on the press frame at 33, the shorter portion 35 of the beam supporting a punch 79 and the longer portion 36 actuating one or more further tools such as a shear 56, a shear 64 for cutting angle iron and a press brake 65. Fluid cylinders 37 and 38 mounted in trunnions 39, 40 on the frame are connected to the portion 36 and a valve (93) and manually operable valves 1-4, Fig. 11 (not shown), enable hydraulic fluid to be fed selectively to either side of either piston. To actuate the shears &c. with normal power a pedal 91 is depressed which causes piston and cylinder device 37, which is preferably of larger volume than the device 38, to lower the beam portion 36, the underside 66' of the beam actuating the shear 64 &c. The shear 56 is actuated through a secondary beam 49 pivotable about trunnion 50. The stroke length of the beam when shearing is determined by the position of an adjustable stop 151 on a control rod 148 which when the beam portion 36 reaches the lowermost position reverses the position of the valve 93 to supply fluid to the underside of the piston of cylinder 38 for quick return of the beam. For actuating the shears, &c. with maximum power the cylinder devices 37 and 38 are coupled. For punching with normal power, a pedal 121 is depressed and fluid is supplied to the underside of the piston of device 37. An adjustable stop 152 determines the stroke length. The device 38 may be coupled to the device 37 for maximum power. Spindles 83<SP>1</SP> at the end of the beam portion 34 engage under detents 84 in links 82 pivoted to the punch spindle 78. A handle allows the links to be pivoted against spring bias out of engagement with the spindles 83<SP>1</SP>. A hold down 60, Fig. 16, is rotatable to bring a selected strip 61 into operation.