Abstract: Method and apparatus for rolling a cylindrical blank in pressed contact with shaped rolling or die faces of rolling dies to generate, on the periphery of the blank, plural teeth corresponding to a profile of the die faces of the dies. The blank is rolled bidirectionally on the die faces of the dies, first in one of opposite directions and subsequently in the other direction. The blank is fed along its axis of rolling while it is rolled bidirectionally, to push the same between the dies for axially progressive rolling engagement thereof with the die faces. The rolling dies may be of reciprocating flat type or rotating cylindrical type. The feeding motion of the blank may be temporarily stopped upon a temporary stop of the rolling movements of the blank at the end of a first movement thereof in one of the opposite directions.

Abstract: An automatic barrel winding mechanism of the unidirectional type in which the main feature resides in a substantially reduced torque ratio : 0.5 - 1.1 in combination with a substantially reduced reduction ratio : 1/60 - 1/126 of the barrel winding gear train for transmitting moton from the barrel-winding mass to the barrel.

Abstract: A slip wheel arrangement of a watch movement in which a center wheel is provided with an integral arbor which, in turn is formed with a double-tapered portion. For a slip-on coupling of a cannon pinion with the arbor, the pinion is formed with an integral tubular portion which includes a middle resilient part and a thickened end part, and is provided with at least one inwardly projecting projection on the resilient part. The leading portion of the bore of the tubular portion has a diameter larger than the sum of a largest diameter measured at the forward part of the arbor from the double-tapered part, plus the coupling idle gap measured thereat, with the inward projection being positioned within the area of the leading portion.