Patent GB-343324-A (GB)
Title: Improvements in or relating to controlling the shearing of moving material
IPC: B23D36/00
Filed: 1930-02-25
Abstract: 343,324. Shearing rolled billets. WHITE, A. E., 5, Quality Court, Chancery Lane, London.-(Morgan Construction Co. ; Worcester, Massachusetts, U.S.A.) Feb. 25, 1930, No. 6222. [Class 83 (iv).] Rolled billets are cropped at their front ends and divided into uniform lengths, by flying shears, controlled by an electrically operated mechanism, which functions regardless of the variation in remainder-lengths, and variation in gap-lengths between successive pieces. The flying shear 1 is operated by a valve 8, controlled by a hand lever 12, or by an electromagnet 11 which can also be controlled by a hand operated switch. The solenoid 11 is controlled by discs 20, 19 frictionally held on a shaft 21, and duplicate mechanism on a shaft 21<1>. In operation, the billet depresses a flag 45 which frees the disc 20 for closing contacts for the crop cut, the disc 19 is then freed for the first division cut and so on alternately. When the flag rises the control is automatically thrown over to the duplicate mechanism for the succeeding billet. The mechanism is shown diagrammatically in Fig. 2. The stock depresses the flag 45 to break a contact 46. The circuit in solenoid 33 is broken and a latch 32 is withdrawn to release the disc 20. The circuit in solenoid 31 is broken to allow a spring 30 to position a dog 29. As the disc 20 turns, dogs 77 close contacts 42, to close circuit through the shear operating solenoid 11. To make the initial cropping cut a solenoid 28 is energized, and contact 42 is closed to withdraw a dog 26 to release the disc 19 at the moment of actuation of the shear, and dogs 78 close contacts 41 to energize the solenoid 11 to cause the second cut. At the initial depression of the flag 45, circuit in solenoid 31 is broken and the dog 29 is positioned to stop the disc 20 after the dog 77 has made contact 18. The disc 20 remains at rest until the dogs 78 operate contacts 17 and then solenoid 31 is energized to release the disc 20 for another revolution. When solenoid 31 is de-energized by opening contact 17 the dog 29 stops the disc 20 after a complete revolution. A bridge piece 51 is shifted by energization of solenoids 28, 31 to close contacts 52, 53 to ensure moving disc 19 or 20 is stopped when the flag 45 is released. When the disc 19 is released contact 53 is closed ready to energize solenoid 36 when contact 46 is made on release of the flag. When the gaps between successive pieces are shorter than the lengths into which the pieces are cut and a single control mechanism has insufficient time for resetting, the control mechanism is duplicated, and alternate control operation on successive pieces is arranged by connecting bridge pieces 51, 51a of the controls to contacts 46, 47 which are closed alternately by operation of the flag. A rod 60 is held in a loosely pivoted arm 61 connected to a rod 64 controlled by the flag and a loosely mounted selector plate 70, Fig. 7, guides the rod to break alternately contacts 54, 55. The operating lever of the mechanism has three positions, Fig. 4, not shown. In end position the switches are closed to throw the solenoid 11 in circuit for automatic actuation. In the other end position the valve of the shear - actuating cylinder is controlled by hand, and, in a mid position contacts 46, 47 are short circuited and the circuits of solenoids 33, 36 are maintained independently of the members 54, 55. To control the length of the crop end and the subsequent pieces the following mechanism. Fig. 6, is provided. The final finishing roll 22a is driven by an electromotor 92 and a synchronous motor 91 drives the shafts 21, 21<1> through gearing. The arm 40 carrying contacts 41, 42 is angularly adjusted to vary the billet length, the latches 32, 35 are angularly adjusted by an arm 39 to vary the crop end.