Citizen Watch Company, Ltd.

Mituo Saito

Kotaro Takahashi

Hidetaka Tutiya

Goro Ishikawa

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.

Automatic barrel winding mechanism

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.

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Tokyo, Japan

Mituo Saito