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Device for correction of a display mechanism for a timepiece and wheel equipping such a device

A technology for display mechanism and display correction, which is applied to mechanical equipment, mechanical devices for time indication, mechanical devices for adjusting time indication devices, etc., and can solve the problems of inconvenient display components and unsuitability for ultra-thin movement

Active Publication Date: 2008-10-15
ETA SA MFG HORLOGERE SUISSE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Correction devices of this type are of course extremely simple, but are indeed inconvenient for large diameter display members, the diameter of the pinion must be proportional to the pitch of the display member teeth so that each wing drives the display member through one step as the pinion rotates.
Therefore, the larger the diameter of the display member, the more important the diameter of the pinion is, which is why this device is not suitable for ultra-thin movements

Method used

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  • Device for correction of a display mechanism for a timepiece and wheel equipping such a device
  • Device for correction of a display mechanism for a timepiece and wheel equipping such a device
  • Device for correction of a display mechanism for a timepiece and wheel equipping such a device

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Embodiment Construction

[0015] Indicated generally by the reference number 10, the figure 1 and the correcting device shown in FIG. 2 for correcting the display of the time indication provided by the display member 12 . The time indication is, for example, the day, month or day of the week. The display member 12 is generally formed by a ring 14 on which time indicators are marked. The ring is provided with an internal toothing 16 of pitch P formed by teeth 17 of width s separated by a space of width S=P-s. The display member 12 is also mounted for rotation on a plate 18 and is angularly positioned by a jumper spring 20 . A retaining plate 22 partially covers the teeth 16 and is fixed to the plate 18 , axially positioning the display member 12 . A drive mechanism for the display member 12 is provided but not shown. The drive mechanism comprises, for example in the case of a date display, a date drive wheel which is driven by a central hour wheel to activate the display member 12 one step per day. ...

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Abstract

The wheel has a toothing (40) defined by a pitch (P), head diameter and foot diameter. Teeth (42) are provided with a tip portion that forms another toothing i.e. saw-shaped toothing, which is coplanar and concentric to the toothing (40). The head diameter of the saw-shaped toothing is equal to head diameter of the toothing (40). The foot diameter of the saw-shaped toothing is greater than the foot diameter of the toothing (40), where the two toothings allow coupling in different direction of rotation. An independent claim is also included for a correction device for a timepiece display mechanism, comprising a display member that is fitted with a toothing.

Description

technical field [0001] The invention relates to the field of watches and clocks. The invention relates more particularly to a correction device for a time-indicating display mechanism comprising a wheel equipped with two toothings lying in the same plane. The invention also relates to said wheel itself. Background technique [0002] Mechanisms for displaying a time indication such as a date are known to those skilled in the art. The mechanism typically includes a display member such as a date ring, a mechanism to drive the display member, and a correction device activated by the winding stem. Correction equipment is generally complicated and inconvenient. They typically comprise at least one intermediate wheel activated by a pinion mounted on the winding stem, and a sliding or stationary corrector pinion meshing with the intermediate wheel and with the display member. [0003] The main disadvantage of this type of correction device is its thickness, mainly due to the int...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G04B27/00G04B19/24
CPCG04B13/02G04B19/25Y10T74/1987G04B13/027
Inventor J·蔡格纳特M·贝特利尼
Owner ETA SA MFG HORLOGERE SUISSE
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