Patent GB-558508-A (GB)
Title: Apparatus for the cutting and working of sheet metal and other rigid sheet materials
IPC: B21D5/04
Filed: 1942-10-02
Abstract: 558,508. Cutting and working sheet metal &c. WARING, F. E. Oct. 2, 1942, No. 13835. [Class 83 (iv)] Angular bending; shearing ; punching ; embossing.-A machine for cutting and working sheet metal and other rigid sheet material comprises a three-roll bender of which two of the rolls are geared together and the other is adjustable to vary the curvature and a rotary shearing device the cutters of which are mounted on the ends of the geared rolls so as to be operated by the same driving means. The machine may be used for rolling, coiling, shearing, punching, work cutting, folding, flanging, zig-zagging, seaming, swaging and wiring and is suitable for use in small workshops, by amateur mechanics, model and toy makers, and is also useful for educational purposes. Mounted between and in vertical slots in the end plates 1, which have feet 3 for securing to a bench or table, are a pair of rolls 6 which are geared together and driven by a handle 8 so as to co-operate with an adjustable roll 11 to effect a curving operation. By feeding a narrow strip at an angle a helical cylindrical article may be made . The roll 11 is a hollow shell mounted on a rigid rod 10 which is adjusted by screws 12 in slots 9 in the end plates. The rod is withdrawn axially for facilitating removal of the work. The trunnions 5 of the rolls 6 where they project beyond an end plate are provided with removable overlapping rotary shearing cutters 13, or alternatively a pair of swaging, wiring or other forming rolls, Fig. 5. For cutting circles or rings by the cutters 13 the work with a punched hole therein is connected by a pivot screw 19 to a holder 18 adjustable on a rod or number of rods 16 coupled together and screwed into the end plate. In straight line cutting a guide plate 49 may be used which is slotted at 52 so that it may be adjustable on a stud 51 and can be moved round on the stud from the inoperative position shown to bring the work guide slot 50 into position. In rear of the roll bender is mounted between the end plates a round or flat anvil 22 which co-operates with a pivoted member 20, 21 mounted on pivots 23 adjustable in the end plates so as to effect folding or flanging operations. If desired a flat bar may be inserted between the member 20, 21 and anvil 22. The work is placed in the gap between the parts 20, 21 and its rear edge rests against a stop formed on a protractor 27 which is angularly adjustable and is carried by a member adjustable along a rod 26 forming the operating handle of the pivoted bender. The anvil is movable endwise for work removing purposes. In bending wires the wire is first passed through a hole 20a in the member 20. On the rear of the front cover 29 of the machine is mounted an inclined reciprocating blade 30 which co-operates with a fixer blade 35 formed at the edge of the slot 36 in the cover. The blade 30 is slotted to receive arms 33 projecting from a shaft 32 which is operated by a handle bar passed through a hole 34 in the shaft. The work is placed on a table 37 and is pushed through the slot against a stop 38a on an adjustable graduated open frame 38, which is provided on its front end with a slidable and angularly adjustable gauge 40 provided with a protractor scale 41 for making an inclined cut. On the front of the cover is secured a block 42 in which is mounted a spring- retracted punch spindle 43 provided with a removpunch 44 co-operating with an interchangeable able die 45 on the table 37. The punch spindle is pushed down by a handle 47 which is passed through a hole in a stud 46 rotatably mounted on the cover. The work in this case also can be positioned by the frame 38. If the punch is to form a depression only a limit stop is provided. Co-operating holes 48 in the stud and cover may be provided for the insertion of wires to be cut by operating the handle 47. The horizontal apron 2 may be as shown in Fig. 3 or may be provided with a die plate 53 containing three holes of different size co-operating with three similar punches 55 on spindles spring mounted on a cross bar 54 and operated by the part 20, of the member 20, 21. A gauge 58 with an upstanding pin may be slidably adjustable across the apron and set in desired position. For repetition punching each punched hole fits over the pin to determine the place for the next hole.