Patent ID: 6293025
Filing Date: 2001-09-25
Classification: G01B

Abstract:
Method for verifying and measuring a double-toothing sprocket wheel (14) to identify the respective positions of the teeth (24) of the two toothed rings (27a, 27b) thereof, the sprocket wheel (14) having straight or bi-helical double-toothing and the teeth (24) of the two toothed rings (27a, 27b) being aligned or offset, the sprocket wheel (14) being arranged on a support (12), in which use is made of a pair of contacting elements, respectively a first lower element and a second upper element, characterized in that said first, lower (23a) and said second, upper (23b) contacting elements lie in different parallel planes, the said contacting elements being capable of cooperating respectively with one groove (25) of the first ring (27a) and one groove (25) of the second ring (27b) and the median plane (16) of the sprocket wheel (14) being aligned with a plane central to the planes in which the contacting elements (23a, 23b) lie, in which the first contacting element (23a) is constrained to lie in a position which is fixed radially with respect to the longitudinal axis (17) of the sprocket wheel (14), as a reference position, and the second contacting element (23b) is progressively displaced in a radial direction with respect to the longitudinal axis (17) of the sprocket wheel (14) until said second contacting element reaches a position of maximum possible advance, the position of maximum advance then being compared with the reference position defined by the first contacting element (23a) to establish a condition of alignment between terminal ends (123) of the two contacting elements (23a, 23b), with the sprocket wheel (14) being found acceptable or unacceptable because of negative or positive misalignment, indicating a defect in the sprocket wheel (14).