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AssigneeTechnologies Research Holding S.A.
InventorSheridan Ralph Gill
Estimating the term…
Centering device acting upon an already present first ring (14a) of a straight or double helical toothing of gears, sprocket wheels or pulleys to obtain the second ring (14b) of the toothing generated by a pinion shaped cutter (16), a central groove (19) separating said first ring and said second ring. The centering device comprising a retractable pin (20, 120), cooperating during the positioning step of the gear (13), with at least a tooth (15) of the first ring (14a), having a first waiting position (20a, 120a) and a second operating position (20b, 120b) defining the angular position of the gear (13) clamped on the rotary supporting base (18), the angular position being functionally correlated to the plane which contains the axis (25) of the gear (11) and the axis (26) of the cutter (16).
Supporting device for use in generating the second ring of a sprocket wheel or pulley wheel (11), having a first ring (14a) which is already formed and a second ring (14b) which has yet to be formed, the rings (14a, 14b) being separated by a central groove (19), each ring (14a, 14b), when finished including respective teeth (15) which are straight or are inclined from 2° to 60° with respect to a median plane (29) orthogonal to the axis (25) of the sprocket wheel (11), said supporting device being associated in use, with a generating blade or pinion instrument (16) which is to move in a to-and-fro movement in relation to an axis (26) thereof located parallel to the axis of rotation (25) of the sprocket wheel or pulley wheel (25), and travel from a first position outside the ring (14a, 14b) to a second position coordinated with the central groove (19), the supporting base (18) having a supporting surface (18b) for receiving thereon a workpiece (13) providing said rings (14a, 14b), a shaft (17) to axially position and clamp the workpiece (13) from which the sprocket wheel or pulley wheel (11) is to be generated as the generating blade or pinion instrument (16) undergoes said travel and a centering device, characterised in that the centering device comprises a retractable pin (20, 120) incorporated in the base (18) to protrude therefrom, being mounted so that it can be in a first, waiting position (20a, 120a) and a second operating position (20b, 120b), the pin (20, 120) in the first waiting position (20a, 120a) being for cooperating during the positioning of the workpiece (13) with at least a tooth of the first ring (14a), the second operating position (20b, 120b) of the retractable pin then defining the angular position of the workpiece (13) clamped on the rotary supporting base (18), the angular position being functionally correlatable, in use, to a plane common to it, the axis (25) of the sprocket wheel or pulley wheel (11) and the axis (26) of the generating blade or pinion instrument (16).
Method for generating the second ring of a sprocket wheel or pulley wheel (11) having a first ring (14a) which is already formed and a second ring (14b) which has yet to be formed, the rings (14a, 14b) being separated by a central groove (19) so that both rings of the finished sprocket wheel or pulley wheel include respective teeth (15) which are straight or are inclined from 2° to 60° with respect to a median plane (29) orthogonal to the axis (25) of the sprocket wheel (11), in which method, a workpiece (13) having the rings (14a, 14b) is placed on a supporting base (18) having a supporting surface (18b), the workpiece (13) is axially positioned and clamped on a shaft (17) and the workpiece (13) is centered prior to its being subjected to the action of a generating blade or pinion instrument (16) which is moved in a to-and-fro movement in relation to an axis (26) thereof which is located parallel the axis of rotation (25) of the sprocket wheel or pulley wheel, the generating blade or pinion instrument (16) travelling from a first position outside the workpiece (13) to a second position coordinated with the central groove (19), characterised in that the centering is achieved by means of a retractable pin (20,120) housed in the base (18) and protruding from the base, the retractable pin (20,120) being mounted so that it is initially in a first, waiting position (20a,120a) and assumes a second operating position (20b),120b) when the workpiece (13) is placed thereover when the pin (20,120) is caused to cooperate with at least a tooth of the first ring (14a) to define the angular position of the workpiece (13) with respect to a plane common to it, the axis (25) of the sprocket wheel or pulley wheel (11) and the axis (26) of the generating blade or pinion instrument (16).
Dependencies are inferred from the claim text.