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US 4,249,251 AGranted
Gear train for timepiece with a stepping motor
AssigneeTimex Corporation
InventorPaul Wuthrich
Life of this patent
Estimating the term…
Abstract
A stepping motor driven by a time-based electrical driving signal periodically rotates an overhung gear train directly driving the hour and minute hands mounted on a main arbor. The arbor is rotatably mounted in two spaced journals in a single tapered bearing hole in the frame. An intermediate arbor is similarly journaled. The gear train is assembled from only one side of the timepiece. The main arbor, center gear assembly, hands and dial are all added as a subassembly.
Claims5
An electronic stepping motor timepiece comprising:
- means generating time-based electrical driving signals,
- a stepping motor having a rotor and pinion adapted to periodically rotate in response to said signals,
- a frame carrying said stepping motor and having at least one bore defining spaced larger and smaller diameter journal bearings, within said bore,
- at least one arbor disposed in said bore having a journal portion with spaced larger and smaller diameter journals, and an overhung portion extending from the frame,
- a center wheel attached to said overhung arbor portion and a bushing rotatably disposed on the arbor having an hour wheel attached thereto,
- an intermediate gear and pinion assembly rotatably mounted on the frame and driving the center wheel and hour wheel,
- said stepping motor pinion directly driving said gear and pinion assembly.
4 more elements
An electronic stepping motor timepiece comprising:
- means generating time-based electrical driving signals,
- a stepping motor having a rotor and pinion adapted to periodically rotate in response to said signals,
- a frame carrying said stepping motor and having first and second spaced bores, said bores defining journal bearings,
- a first overhung arbor disposed in the first bore having a center wheel thereon,
- a second overhung arbor disposed in the second bore having a minute wheel fixed thereon driving the center wheel and also having a minute pinion fixed thereon,
- a bushing rotatably journaled on the first arbor having thereon an hour wheel driven by said minute pinion,
- a separate intermediate wheel disposed on and affixed to the second arbor and driven directly by said stepping motor pinion.
4 more elements
Dependencies are inferred from the claim text.