Patent GB-886936-A (GB)
Title: Apparatus for shearing continuously advancing strip
IPC: B23D33/02
Filed: 1959-07-03
Abstract: 886,936. Shearing. WEAN EQUIPMENT CORPORATION. July 3, 1959 [Dec. 8, 1958], No. 22899/59. Class 83 (4). A flying shear comprises a feedstop 90, Fig. 14, carried by one of the blade-heads 10, 14, Fig. 1, and retractable from the pass-line of the stock S by means 96 carried by the other blade-head, and means 17, 18 for feeding the stock so that its leading end registers with the stop. As applied to a shear in which a frame 9 carrying the upper head 10 and oscillated by crank-pins 7, 8 guides the lower head 14, which is connected to links 12, arms 97 on the upper head 10 each carry a pin 96 for retracting two stops 90 carried by the lower head 14. Feed-stops.-Each stop 90, Fig. 14, is pivoted at 89 to a base 88 secured adjustably to a platform 83d by screws 83e. The platform is connected to a slide 83, Fig. 13, and a spacer 83b between them is received in a slot 83c in the wall of one of the slideways 82, which are mounted on a base 81 adjustable laterally of the stock. Adjustment is by screws 72, 78 supporting the bar 81 and interconnected by a chain- and-sprockets 79 so that the screws move equally. Screws 72 are in brackets 71 on the lower head 14, and the screws 78 in brackets 77 on a bifurcated lever 75 pivoted at 74 to the machine-base. Adjustment of slides 83 is by micrometer heads 86. A latch 93 biased by a spring 100 engages beneath a ledge 94 on each stop 90 when this is depressed beneath the stock line, to permit discharge of the sheared stock. The latch is released by a cranked lever 103 connected to the latch by a rod 99 and operated by an abutment 110 on the frame 9, allowing a spring 92 to return the stop. During shearing, the work is clamped by two clamps 63 at the entry side of the shear and two, 137, at the discharge side. The discharge clamps 137 are biased by springs 119, Fig. 15, and operated to clamp the stock S against the top of the slideways 82 by cams 136, Fig. 17, on rods 135 depending from the arms 97. A spring-loaded dog 130 pivoted on a plunger 132 contacting a toggle linkage 125, 128 is engaged by the cam, and as the cam descends straightens the linkage. This turns a crosshead 122 about a pivot 121 and depresses the clamp, which is released when the cam passes the dog 130. Return of the cam rotates the dog about its pivot 131 (Fig. 18, not shown) without applying the clamp. The entry clamps 63, Fig. 7, are connected by rods 55 to the lower blade-head 14 and move on guide-rods 48 mounted in a bracket 47 attached to a housing for the feed rolls 17, 18 and carrying a table 47a having slots through which the clamps hold the stock. The clamp bodies 50 are interconnected by tubes 53, extension tubes supporting end brackets 62b interconnected by further tubes 62 above the pass-line. The upper tubes 62 support the upper spring-pressed elements 64 of the clamps in alignment with the lower elements 57, which are biased downwardly by springs attached to pins 70. Upward movement of elements 57 to clamp the stock is by cams 49 on the stationary rods 48 contacting dogs 60 on the elements. The dogs 60 are pivoted on the elements 57 so that return movements of the clamps along rods 48 do not operate them. Roller feeds.-Drive for the feed rolls 17, 18, Fig. 4, is by a variable-speed unit 37 and a spring-loaded clutch 40, the roll-shafts being connected at each end by gears 41, 42. During shearing, the upper roll 17 is raised, against the action of fluid-pressure units 25, 26, to permit feed-control by the entry and discharge clamps. This is effected by cams 45 on the roll-shaft 39 and followers 46 on the shaft of roll 17. Drive for the cams is by an electric motor or reduction gear 36, chains 30, 34 and gears 28, 44, the latter and cams 48 being journalled on shaft 39. As the stock contacts the feed-stops 90, the entry and discharge clamps are operated, feedroll 17 is raised and the stops 90 lowered. A conveyer (not shown) removes the sheared stock. Specification 857,828 is referred to. Reference has been directed by the Comptroller to Specification 861,330.