CH377218A - Method of finishing the surface of timepieces - Google Patents

Description

  

  Method of finishing the surface of timepieces The finishing of the surface of clock parts, in particular the finishing, softening or polishing, for example of plates and bridges, is generally carried out by passing successive on wheels of different grains. These grinding wheels are made entirely of abrasive material or are formed from discs covered with emery paper. This method has the drawback of requiring several grinding wheels over each of which the worker must pass the part, which results in loss of time due to handling.



  A specific subject of the present invention is a process for the finishing, softening and polishing of timepieces, in particular plates and bridges, which does not have these drawbacks. This process is characterized by the fact that one passes the same part on a single disc or a single strip of abrasive paper having at least two zones of different grains and that this part is successively subjected to the action of each of these areas.



  The abrasive paper discs allowing the implementation of this process preferably have concentric zones of different grains. The part is then moved from the center of the disc to its periphery along one of its radii. The strips of abrasive paper, for their part, have longitudinal zones arranged side by side and through which the part is moved.



  These zones can be of different widths so as to allow the worker to pass his workpiece with a uniform speed while subjecting it to the action of each zone -for different durations. These discs and these tapes can of course have, depending on the case, different numbers of zones. By way of example, a first zone with a grain of 320, a second of 0, a third of 3/0 and a fourth of American 4/0 grain could be provided for a mirror polish.

   For a fine-softening, three zones of grains 1G, 1F, and 320 2/0 could be provided. Finally, for a sweetness, only two areas of 0 and 3/0 grains could be provided.



  This process makes it possible to use only one grinding wheel for a job which previously required several; it also facilitates the work of the worker since he no longer needs to choose each passage himself but can rely on the layout of the zones on the discs or on the tapes. Finally, this process reduces to a large extent the losses of time due to the handling of the parts to be machined.

 

Claims (1)

CLAIM Process for finishing the surface of timepieces, in particular for finishing, softening and polishing, characterized in that the same part is passed over a single disc or a single strip of abrasive paper having at least two zones of different grains and that this part is subjected successively to the action of each of these zones. SUB-CLAIMS, 1. Method according to claim, characterized in that the part is moved manually on the abrasive paper. 2. Method according to claim, characterized in that means are provided for holding the part in a support and that this support is moved relative to the abrasive paper. 3. Process according to claim, characterized by the fact that the part is moved by the radius of the abrasive disc, the areas of which it is made up of are arranged concentrically with one another. 4. Method according to claim, characterized in that the part is moved transversely to the abrasive belt, the areas of which it is composed are arranged longitudinally.