Timepiece with a date mechanism comprising two superposed date rings
A technology for calendars and clocks, which is applied to mechanically driven clocks, clocks, and time-indicating mechanical devices, and can solve problems such as difficulty in obtaining jumpers
Active Publication Date: 2005-06-01
ETA SA MFG HORLOGERE SUISSE
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Problems solved by technology
Therefore it is difficult to obtain such a jumper
Method used
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[0021] Starting from a general inventive idea, the present invention aims to provide a calendar mechanism for timepieces, which on the one hand comprises a drive which makes one revolution every twenty-four hours and drives the date ring by acting on its teeth The wheel, on the other hand, includes a correction device for rapidly changing the display provided by the calendar mechanism. To achieve this effect, the date rings each comprise two inner circumferential ring gears, one of which cooperates with the drive wheel and the other with the correction device. Furthermore, each of said ring gears has a position where it is toothless to define an extended rest position of the associated ring. More specifically, when the vacancy of one ring (the opening of the upper ring and the unmarked section of the lower ring) is in the display position of the watch, the drive wheel and correcting device are opposed to the tooth-missing position of the ring gear of the associated ring. Thus...
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The present invention discloses a calendar mechanism for a timepiece, such as a wristwatch, comprising two superimposed upper and lower calendar rings, the surface of which is divided into sections, including a section with consecutive markings and additional sections, Each ring cooperates with the driving device so that the marks of the lower ring appear in a display area in sequence. The calendar mechanism is characterized in that each ring includes two upper and lower circumferential ring gears, and the teeth of the upper and lower ring gears of the upper ring The teeth of the upper and lower ring gears of the lower ring are staggered, and there is a missing tooth in each ring gear, and the calendar mechanism also includes a correction device, and the driving device is respectively relative to the upper teeth of the upper ring. The position of the ring and the lower ring gear of the lower ring and the position of the correction device relative to the lower ring gear of the upper ring and the upper ring gear of the lower ring respectively are such that when the additional section of the upper ring is in the position of the display area, the driving device And the correcting device is respectively opposite to the tooth-missing positions of the upper ring gear and the lower ring gear of the upper ring, and vice versa.
Description
technical field [0001] The invention relates to a large date mechanism comprising two superimposed date rings, one above and one below. One of the rings bears fifteen consecutive markers out of the 31 positions of a cycle, while the other bears another sixteen markers. Background technique [0002] Cycle counting and display devices having apertures for displaying the date in calendar timepieces are known. In general, an analogue display of the date is conventionally performed using a calendar ring comprising 31 segments marked from 1 to 31. However, such a device has the disadvantage that only an area whose size corresponds to one thirty-first of the circumference of the ring is provided for each segment. Especially in small wristwatches, this area is not sufficient for the date display to be easily read. There is therefore a need for a device capable of displaying a "big date" over an area much larger than one thirty-first of the circumference. [0003] The first solut...
Claims
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Login to View More IPC IPC(8): G04B19/247G04B19/24G04B19/25G04B19/253
CPCG04B19/25G04B19/25366
Inventor R·维勒曼R·梅茨格M·贝特里尼
Owner ETA SA MFG HORLOGERE SUISSE