GB661568A - Improvements in or relating to metal-drawing presses - Google Patents

Abstract

661,568. Cupping. STEVENS, A. H. (Clearing Machine Corporation). Jan. 3, 1949, No. 2584/49. Class 83 (iv). A cupping press includes two slides, one operatively connected to the middle portion of a maindrive shaft and the other coupled by linkages to two crossheads, each operatively connected to the main shaft and slidably mounted on a stationary rod adjacent the end of the shaft. The press frame comprises a bed 1 and crown 2 supported by side members 3 and 4, Fig. 1. Mounted in the crown is a crank-shaft 27 driven from a motor 14 by a belt 17 and gears 26. The outer work holding slide 7 is operated in guides 11 by adjustable connecting members 9 which move vertically through guides 10 and which are connected at their upper ends to links 39 which are pivoted at 44 to links 41 mounted on fixed pivots 42 and secured at their upper ends to links 37 pivoted at 38 to ears 36 extending from a crosshead 34 vertically slidable along two stationary guide rods 35. Pins 33 projecting laterally from the crosshead are received in an extension 32 of a strap 31 surrounding an eccentric projection 30 on one side of the gears 26 driving the shaft 27. The linkage is such that in the upper position of the crosshead shown in Fig. 6, the links 37 move through a dead-centre position without moving the slide 7, thus providing a comparatively long period of dwell during which the work is held and operated upon by the tool carried by the inner slide 8 which as shown in Fig. 5 is directly connected to the crank 28 of the shaft 27. In a modified form, Fig. 12, the crosshead is secured to the outer slide by a similar linkage but is arranged below the main shaft 59 from which it is operated by means of pins 63 engaging straps 61 around eccentrics 60 carried at the ends of the shaft. The shaft is driven by a pair of comparatively large gears 76 arranged between the eccentrics 60 and between the gears is a further eccentric 78 which operates the inner tool slide through a sleeve 80 with a downward extension 81 coupled by a pin 82 to a member 57 secured to the inner slide.