Patent GB-527848-A (GB)
Title: Improvements in or relating to machine tools, particularly for cutting rolled or milled products
IPC: B23D25/04
Filed: 1939-04-21
Abstract: 527,848. Shearing. STEVENS, A. H. (Yoder Co.). April 21, 1939, No. 12032. [Class 83 (iv)] In apparatus for severing moving rods &c. the work releases a stop to allow a spring or other operated power mechanism to give an impulse to accelerate a cutter actuating shaft and a separate power mechanism to operate to supplement the rotative effort of the spring operated machine and to continue the rotation of the shaft and to reset the spring operated mechanism and restore the mechanism. During the initial movement of the trigger plate 125 and the cam 145 by the workpiece, cam follower 155 drops into a recess 156 of the cam 145 permitting contacts 148-149 to close. Solenoid 65 is energized and trips the latch 60,62, freeing the striker and allowing the springs to rock the crankshaft and actuate the cutters. The work continues to advance after the closing of the contacts 148, 149 and the arm 127 is moved to turn cam 143 to allow clutch 130, 135 to engage. The motor 140 then takes up the drive and cam 143 then disconnects the clutch. The crankshaft 15 carries offset cranks connected by rods 30, 31 to spring cylinders 25, 26. The springs are compressed and the shaft 15 latched. Release of the latch rotates the shaft and actuates links 52 connected to the cutter head 50. The cutter 75 is mounted on the head 50 on a carriage 55 and is depressed to effect shearing by a crossbar 53 engaging the links 52. The carriage is mounted on links 42, 43 and is moved in the direction of the work by springs 100 when freed by a blocking cam 105 driven by the crankshaft. The end of the work engages a trigger plate 125 on an adjustable base 121 and closes contacts to energize a solenoid 65 which trips the shaft 15. The trip 125 is mounted on an arm 126 pivoted on cranks 127, 128. The crank 127 operates a clutch element 130, Fig. 5, similar to the clutch 85, driven from a motor 140 to make and break the driving connection between the motor and the shaft 129. A cam 145 on the shaft 129 controls movement of a contact arm 147 controlling the contacts 148, 149 in circuit with the solenoid 65. The shaft 15 is latched with the springs compressed by a lever 63 pivoted to the rod 31 and engaged by a latch 62 operated by the solenoid 65. Energization of the solenoid frees the lever 63 and permits the rotation of the crankshaft. Springs 72, 74 restore the parts. An electromotor 75 constantly rotates a wheel 80 loose on the shaft 15 and coupled thereto by a clutch element 85 operated by a cam 87 on the element 85. When the clutch 85 is engaged the electromotor 75 takes up the drive and rotates the crankshaft in the same direction as the spring until the head 50 is in the raised position when the cam 87 disengages the clutch. The head is then held by the latching means. A counterweight keyed to the shaft 15 assists the impulse to the shaft. In operation, the end of the rod 41 moves the trigger plate 125 to energize the solenoid 65. The latch 62 is swung to free the shaft 15 to allow the springs to rotate it and depress the cutter head 50. This rotation engages the clutch 85, 86 to allow the electromotor 75 to take up the drive and to restore the parts. The trigger plate 125 is restored by the electromotor 140. The carriage 55 is moved at the speed of the rod by spring 100 as the cam 105 is rocked from the crankshaft. In a modification, Fig. 11, cutters 29, 30 are moved at the speed of the rod by a flag secured to the dies and the cutters are successively actuated by rods 38, 43 from a crankshaft.