GB1440882A - Stroke-end programmers for machine tools notably bending presses or the like - Google Patents

Abstract

1440882 Bending stop-motions PROMECAM SISSON-LEHMANN 6 June 1974 25213/74 Heading B3E Apparatus for terminating the stroke of a hydraulically driven machine tool, e.g. a bending press, comprises a valve 7 operated by a wedge 9 moving with the tool and bearing against a stop 12 successive positions of which are determined in a preset sequence by parallel adjustable studs 23 on a barrel 22 supported on and rotated by two parallel rollers, 27a, 27b, there being a plurality of interchangeable barrels corresponding to different preset programmes of stop position sequence. The Figs. show the wedge 9 pivoted on a bending beam at 10, and operating valve 7 through a push rod 8 and protective strip 14. Stop 12 is moved to the right by a ramp 13 on the wedge acting on roller 11 on the stop, until a floating plate 35 abuts that stud 23 which is in the operative position 23a. Further movement of the tool and wedge operates valve 7 to end the stroke, and when the wedge returns, stop 12 is moved back to the left by spring 17. Release of the pressure on the floating plate 35 operates a micro-switch 37 which energizes motor 29 driving the barrel, which rotates until the next protruding stud 23 reaches position 23a and actuates a microswitch 33 stopping motor 29 ready for the next working stroke. Each stud may be positioned axially (including wholly retracted) by rotating it by key 24 within a screw threaded bore in the barrel. The barrel may be adjusted axially by sleeve 30 and set screw 32 to affect all stop positions equally. Cam surfaces 42 on the barrel actuate microswitches 38 operating a digital display. A manually adjustable stop 43 may be installed instead of a barrel.