Patent GB-562750-A (GB)
Title: Improvements in presses for working metal and like operations
IPC: B21D22/06
Filed: 1941-09-18
Abstract: 562,750. Cupping. GLASNER, R. W. Sept. 18, 1941, No. 11952. [Class 83 (iv)] [Also in Group V] A press for metal working or like operations comprises a number of tool-carrying slides, each provided with its own actuating mechanism including a clutch whereby the mechanisms may be connected to or disconnected from a constantly rotating source of power, means for actuating the clutches in sequence and means individual to the clutches and selectively adjustable at any time during the cycle of operation of the press for varying the sequence of operation of the slides and the periods of their dwell. As shown, the press comprises an outer slide 27, Fig. 1, carrying a die 28, a slide 30 movable within the slide 27 and carrying a die 31, and a lower slide 33 carrying a die 34. A work piece 32 is shown supported on a die 26 on the bed-plate 25. The slide 30 is actuated by a shaft 37, Figs. 1 and 5, carrying pinions 44 engaging spur gears 45 free upon short shafts 46 supported in the crown 22 of the press, the gears 45 being provided with eccentric pins 48 connected by arms 49 and links 50 to rods 52 sliding through the bottom of the crown and connected to the slide 30. The shaft 37 is driven by an electromagnetic clutch 40 which connects it with a power driven pulley 39 loose upon the shaft. The slide 27 is actuated by a shaft 63'carrying pinions 62 driving gears 61 also free upon the shafts 46 and to which are connected eccentrics 54, the straps 55 of which are connected to rods 58 carrying the slide 27. The shaft 63 is geared to a sleeve 66 loose on the shaft 37 and adapted to be driven by an electromagnetic clutch 67 when the. latter is operatively connected with the pulley 39. The lower slide 33 is actuated by eccentric mechanism 81 driven through gearing 80 from shaft 91 connectible to a power driven pulley 92 by an electromagnetic clutch. The sequence of operation of the clutches and thus of the slides, and the extent of their dwell periods are controlled by switches in switch boxes 98, Fig. 1, one of which, that for the outer slide 27, is shown in Figs. 10 and 11. The switches comprise fixed arcuate contacts 116 and co-operating contacts 115 carried by pivoted arms 119 having rollers 123 engaging operating cams 113 fixed to a shaft 101 driven by gear connections from the driving gear of the corresponding slide. Some of the contacts 115 are not adjustable, while others are angularly adjustable about the shaft 101, thus altering the timing of the opening and closing of the circuits in which they are connected. For this purpose the arm 119 carrying the contact is pivoted to an arm 121 adjustable about the shaft 101 by worm gear 131 actuated by a rod 128 extending through the wall of the switch box. A scale 124 visible through a window 100 facilitates the setting of the adjustable contacts. The end of the shaft 101 carries a pointer 137 moving over a dial and thus indicating to the operator the position of the slide at any moment. The electric circuits also include a main master switch which may be set into a number of different positions according to the sequence of operations it is desired to perform, and an " inch " master switch which enables any of the slides to be properly positioned at the beginning of a series of operations. The inner slide 30 carries a switch 160 adapted, when that slide reaches a definite downward position relatively to the outer slide 27, to be opened by an adjustable trip arm on the outer slide to break the circuit to prevent possible damage to the press. This switch may be short-circuited when it is desired to move the inner slide right through the outer slide for attachment of the dies. The circuit arrangements for a number of different methods of operation of the machine are described in detail.