Patent GB-331613-A (GB)
Title: Improvements in continuous, automatic shearing machines
IPC: B23D31/00
Filed: 1929-04-22
Abstract: 331,613. Streine, F. H. April 22, 1929. Shearing ; metal-sheet feeds. - A continuous automatic machine for shearing tin plates and sheets comprises conveyers which receive the sheets in packs and convey them to side shears, where the side edges are trimmed with the plates held in a flattened condition by the conveyers, which are stopped during the shearing. After shearing of the side edges, the conveyers again move the sheets to bring the front ends to an end shear, the conveyers stopping whilst the ends of the plates are sheared, after which the conveyers again move the plates forward to a stop for the shearing-off of multiples of a size determined by the position of the stop, this operation being repeated until the entire pack has passed through the machine. The sheets are fed on to link conveyer chains 16, 17 having metal pads 2 on the links between which the plates are gripped and flattened. The conveyers are guided by rails 6 and spring-pressed rails 7 and are driven by sprocket-wheels 34 on a shaft 36, which is driven, through gearing in a casing 59, by an electric motor 54. The conveyers are supported on sprockets 15, 18, 25, 26 one of each pair of these sprockets being slidably keyed on its respective shaft so that one of the conveyers may be moved laterally to suit sheets of different widths. The sides of the plates are sheared by shear blades, respectively carried by a fixed shear housing 9 and a laterally movable housing 11, this housing 11 being mounted on rails 39 and movable thereon by screws 38 which may be driven from a reversible electric motor 50. The housing is adjustably mounted in shoes 40 engaging the rails and having flanges 45 carrying adjusting-screws 46. The correct setting of the housing 11 for a given width of plate is indicated by a scale 52 secured to the housing 9 and an indicator 53 on the housing 11. The housings carry gate shears comprising lower fixed blades 78, 92 and upper balanced shears 77, 79 driven by eecentrics on shafts 73, 80, through gearing, from motors 62, 90 respectively. The end shear consists of a base 108 carrying standards 109 in which are carried, on sprockets on shafts 114, 115 an upper belt conveyer 117, and on sprockets on shafts 118, 120, 122, a lower conveyer 124; the conveyers are driven from the shaft 36 and serve to receive the side-trimmed sheets from the side shears and to convey them through the end shear. The standards 109 carry an adjustable lower blade 126 and an upper blade 127 operated by eccentrics on a shaft 112 driven, through gearing, from a motor 131. The length of the multiples to be cut from the pack is determined by a stop bar 142 movable vertically in a slide 143, which is adjustable on rods 144 by screws 146 operated, through worm gearing, by a crank 151. The stop bar is lifted, to stop the next sheet and to lift one already cut, by arms 152 on the bar and connected to rocker arms 153 operated, in timed relation to the shear blade 127 and the conveyers, by eccentric arms 165 on the shaft 112 and linkages 156 - - 160. The operation of the machine is controlled by switches actuated by engagement thereof by the pack and by limit switches operated by the movements of the shear blades.