Patent GB-1402432-A (GB)
Title: Calender timepiece
IPC: G04B19/253
Filed: 1972-10-06
Abstract: 1402432 Setting calendar watches EBAUCHES SA 6 Oct 1972 [29 Oct 1971] 46185/72 Heading G3T A calendar watch has a control stem which can occupy two axial positions, in a first of which rotation of the stem moves a selector means into one of two positions depending upon the direction of rotation of the stem, and in a second of which axial stem-positions rotation of the stem either corrects the calendar indication or sets the hands of the watch depending upon the position of the selector means. In a first embodiment, Fig. 3, an electricallydriven watch has a lever 8 biased by a spring 10 so that a wheel 7 mounted on the lever always meshes with a pinion 6 which is mounted slidably on the stem 5 and is engaged by an arm 8a, of the lever 8. A pointed end 14a of a selector 14 engages teeth on wheel 7 so that upon clockwise rotation of stem 5 when it is in its "pushed" position, Fig. 1 (not shown), projection 14b of selector 14 engages lever 8. Upon subsequent movement of stem 5 to its "pulled" position, Fig. 3, a trigger piece 12 acts via selector 14 and lever 8 to move wheel 7 into mesh with a setting wheel 19 in engagement with an hour wheel 20, and rotation of the stem sets the hands of the watch. On the other hand when stem 5 is in its "pushed" position and is rotated counter-clockwise, Fig. 2 (not shown), wheel 7 moves selector 14 clear of lever 8 and when the stem is subsequently pulled the teeth of a star wheel 21, mounted coaxially with wheel 7, engage the teeth 1a of a date ring 1. Date ring 1 is connected via wheel 3 and pawls 4 to a day indicator 2 so that rotation of wheel 21 in one direction corrects both indicators 1 and 2, and rotation in the other direction corrects date ring 1 only. In a second embodiment, Fig. 5, (not shown) setting wheel 19 is omitted and pinion 6 is prevented from axial movement by two projections (23a) from the movement frame, though stem 5 can still slide relative to it. Wheel 21 is mounted on the lever coaxilly with a further wheel (26) which is driven by wheel 7 and which, during handsetting, engages the hour wheel. In a third embodiment, Fig. 6 (not shown), selector 14 and lever 8 are replaced by a single lever (29) which can be engaged by either one of two projections (31a, 31b) of the trigger piece. Wheel 7 is frictionally mounted on the pivot of the lever (29) by means of a spring (30). A fourth embodiment, Fig. 7 (not shown) also has a single lever (33) mounted coaxially with wheel 7. In this case the friction is provided by a resilient arm 33b of the lever (33) engaging the periphery of wheel 7. In a fifth embodiment, Fig. 8, the selector means is constituted by two levers 38, 39 rotatably mounted at the ends of a member 37, the lever 39 having an arm 39c engaged in a groove in a sliding pinion 45. In the "pushed" position of stem 42, teeth on a fixed pinion 41 engage the ends of levers 38, 39 to rotate them clockwise or counter-clockwise. When the stem is then pulled, pinion 45 engages the wheel 7 to set the hands, or it engages the date ring 1 to set the calendar indication. In a final embodiment, Fig. 9, which is a mechanically driven watch, rotating the stem 47 in its "pushed" position causes a wheel 51 mounted on a lever 52 to drive this lever to effect displacement of the selector 57. In one direction of rotation wheel 51 also drives a winding wheel 65.