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Swiss lever escapement

A technology of escapement mechanism and lever, which is applied in the field of Swiss lever escapement mechanism, and can solve the problem of energy consumption of the balance wheel

Active Publication Date: 2016-01-20
ROLEX SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This unlocking results in a slight rebound of the escape wheel, which depends on the angle of drag of the pawl, so this phase is energy-consuming for the balance wheel

Method used

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  • Swiss lever escapement
  • Swiss lever escapement
  • Swiss lever escapement

Examples

Experimental program
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Effect test

Embodiment Construction

[0028] The following table gives the definitions of various parameters used in the following description. These parameters are attached figure 1 and 2 shown in.

[0029]

[0030]

[0031] The entire construction of the Swiss lever escapement can be defined by several parameters. Before varying these parameters and studying the system, a functional map of the escapement must be determined. This is a known procedure described in the literature, eg "La Théorie Généraledel' Horlogerie" (General Theory of Horology) by L. Defossez.

[0032] Careful study shows that the parameter Lpl, the relative pawl width expressed as a percentage of the sum of the tooth and pawl arc lengths, is equal to the exit pawl For entering pawl equals is influential. The width must be minimized, as in image 3 as shown in the graph in , as the efficiency decreases as the value increases over the range under consideration. Other parameters are already close to optimal values, or even have op...

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PUM

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Abstract

The invention relates to a Swiss lever escapement comprising a toothed escape wheel and having on the one hand an entry pawl and an exit pawl which mesh alternately with the teeth of the escape wheel and on the other hand an The impact pin on the roller on the shaft periodically engages the lever of the fork. The relative width Lpl of each said pawl expressed as a percentage of the sum of the arc lengths of one said tooth and one said pawl measured on the circumference of the escape wheel is: or Among them, Ls and Le are the arc lengths of exiting the pawl and entering the pawl, respectively, and d is the arc length of an escape wheel tooth.

Description

technical field [0001] The invention relates to a Swiss lever escapement comprising a toothed escape wheel and an entry pawl and an exit pawl which alternately engage with the teeth of the escape wheel and on the other hand a The lever of the fork that periodically engages the impact pins on the rollers on the shaft of the balance wheel. Background technique [0002] The Swiss lever escapement consists of a lever pivotally mounted on an arbor and an escape wheel fixed on the escapement pinion. The gear teeth and the lever pawls with which they alternately come into contact are the connection points with the wheel and the lever. The dart bar extends from between the prongs at the end of the lever stem opposite the pawl, preventing the lever from moving as the balance is free to move through an additional arc until the impact pin of the balance roller next passes between the prongs any vibration occurs. [0003] The operation of the Swiss lever escapement can be divided int...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G04B15/08
CPCG04B15/08
Inventor 拉斐尔·塞图尔-巴龙亚历山大·基乌维
Owner ROLEX SA
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