Abstract: A device for moving a working tool including a support structure provided with a first and a second rectilinear guide, a first and a second support trolley, a first and a second support arm joined to each other and compass-articulated and pivoted respectively on the first and second trolley. The first support arm includes a first element and a second element that are parallel to each other and of equal length, each having a first end rotatably hinged on a respective first and second part projecting from the first trolley and a second end rotatably hinged on connecting brackets between the second ends, in such a way that the connection axis between the first ends and the connection axis of the second ends are parallel to the aforementioned longitudinal axis in any working condition.

Abstract: A broaching device is provided with puller heads (132,134) that hold tip portions of broaches (116) and are supported in a horizontally freely movable manner, main motors (136, 140) capable of moving the puller heads (132, 134), retriever heads (133,135) that hold base end portions of the broaches (116) and are supported in a horizontally freely movable manner, sub motors (138,142) capable of moving the retriever heads (133,135), and a control device (117) that enables the puller heads (132,134) and the retriever heads (133, 135) to be synchronized with each other and to move at a fixed speed by controlling the motors (136,138,140,142), whereby machining accuracy can be improved.

Abstract: A method and apparatus for broaching a series of axially aligned and spaced bores in which a first broach is provided for broaching in an initial operation. The first broach has circumferentially extending cutting teeth. The first broach also has arcuately spaced, longitudinally extending grooves which cross the cutting teeth and divide the cutting teeth into arcuate segments. Broach guides in the spaces between bores have ribs arranged in the same arcuately spaced relation as the grooves about an axis coinciding with the aligned axes of the bores. The first broach is advanced through the bores with the ribs slidably received in the grooves to guide the first broach and the cutting segments, broaching arcuately spaced sectors of the bores but leaving unbroached ridges therebetween. A second broach broaches the ridges left by the first broach.

Abstract: A vertical broaching machine with multiple broaches, particularly for forming tube plates for steam generators, includes a support for supporting a perforated plate in a horizontal position, a broach-holder disposed above the support and movable vertically relative thereto, a pulling unit for the broaches which is disposed below the support and movable vertically relative thereto in alignment with the broach-holder, and means for causing relative movements of the plate and the broaches along two mutually perpendicular horizontal axes in order to align the broaches vertically with successive holes in the plate. The support for the plate is movable along only one of the perpendicular axes and the broach-holder and the pulling unit are movable along the other horizontal axis.

Abstract: An apparatus is provided for machining a flat surface on a workpiece and comprises an annular frame on which an annular wheel is rotatably mounted around a predetermined axis of rotation. A plurality of circumferentially spaced cutting members are secured to one axial surface of the wheel and preferably these cutting members are broaching tools. At least one, and preferably a plurality of circumferentially spaced workpiece holding fixtures are also mounted to the frame so that each fixture is open to, spaced from and axially aligned with said axial surface of said wheel. Each fixture can hold one workpiece with the surface to be machined adjacent the axial surface of the wheel with the cutting members. The wheel is continuously rotatably driven by a suitable motor at a high rotational speed, i.e. in excess of 200 surface feet/minute, while a feed unit associated with each fixture selectively axially moves its fixture with its workpiece towards the wheel, i.e.

Abstract: The invention relates to a multiple-broach broaching machine for broaching a pattern of holes formed in a workpiece. This machine comprises means for moving and positioning the workpieces on the broaching machine, means for pulling the broaches and means for following the broaches, said pull means and follower means co-acting with the opposite ends of the broaches, respectively, to ensure their passage through the holes of the workpieces to be broached from one side to the other side of the workpieces, said pull means and follower means being provided for two similar sets of broaches adapted to operate simultaneously in opposite directions. A handling device is associated with said sets of broaches on either side of the plane in which the workpieces are positioned, for the purpose of transferring each set of broaches, by turning same through 180.degree., from said pull means to the adjacent follower means at the end of each pass.