CH685463B5 - Anchor palette movement horlogeie. - Google Patents

Description

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CH 685 463G A3

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Description

The present invention relates to an anchor pallet, also commonly called an anchor lift, for a watch movement.

The problem of lubricating exhausts from a ruby pallet watch is particularly difficult. It is generally solved by depositing on the teeth of the anchor wheel exactly calibrated doses of a grease whose consistency is studied so that it comes on the impulse planes of the pallets and ensures long-term lubrication. However, this solution is not entirely satisfactory, for several reasons. It implies, for example, waiting times of the running mechanism of around 24 hours. between lubrication and the next operation, which is a check of the timeline of the watch.

Patent CH 116 857 describes an anchor escapement in which the pallets of anchor are pierced right through by at least one channel serving as an oil reservoir while allowing its circulation. The main drawback of such an arrangement lies in the fact that the channel is not directly visible; it is therefore difficult to measure out exactly the quantity of oil to be introduced therein as well as to subsequently control the quantity of oil which it contains. An air bubble introduced into the channel during filling can prevent the free circulation of oil. In addition, cleaning such a channel can be a very delicate operation.

The patents CH 296 393 and 321 946 show devices quite similar to the previous one but comprising grooves arranged in the plane of impulse of the anchor pallets; such an arrangement is not very favorable for the proper functioning of the watch, since this pulse plane regularly comes into contact with the teeth of the anchor wheel.

The present invention aims to improve the conditions for producing watch escapements.

To this end, an anchor pallet is proposed having the characteristics mentioned in claims 1 to 9.

In order to better understand the invention, one can refer to the attached drawing comprising the figures where:

fig. 1 represents a perspective view of one end of an anchor arm comprising a pallet of outlet anchor arranged according to the prior art,

fig. 2 shows, seen from the side, three embodiments of an anchor pallet fitted according to the invention, and FIG. 3 shows, front views, three embodiments of an anchor pallet fitted according to the invention.

In fig. 1, the anchor 1 has a perfectly normal structure, the output pallet 2 is a ruby piece, all the faces of which are polished, and which is driven out and glued into a slot 3 formed in the arm of the anchor 1. The plane impulse 4 and the rest plane 5 cooperate with the teeth of the anchor wheel which turns step by step in the direction of the arrow 6. saitri knows that the surfaces 4 and 5 are particularly important lubrication points, which normally require a special oil, or grease deposited on the teeth of the anchor wheel. The use of a grease allows sufficient lubrication, without running the risk of spreading. Lubrication is then ensured for a longer period. However, the deposition of a grease leads to other drawbacks with regard to the final adjustment operations.

To avoid these drawbacks, the two pallets 2 of the anchor 1 are each shaped with a channel 7 which crosses the lift parallel to the line of greatest slope of the impulse plane 4 in the plane of symmetry of the lift. This channel connects the base of the rest plane 5 with the rear face 8 of the lift. In the case of a ruby pallet, it can be drilled by laser machining, for example. Its shape will be cylindrical with a diameter of 10/100 mm for example. It is also possible to provide two or more parallel channels, of smaller diameter than that indicated above.

Instead of the holes described above, the invention proposes to arrange grooves on one or / and the other of the lateral faces 9 and 10 of the inlet and outlet pallets of the exhaust. Fig. 2 shows several possible embodiments of said grooves. Fig. 2A shows a groove 7 arranged parallel to the impulse plane 4 on one or the other of the lateral faces 9 or 10, FIG. 2B shows the same groove 7 flaring from the face 5 towards the face 8, while FIG. 2C shows the same throat going narrowing. By rotating each of the embodiments described above by 90 °, the profile pallets can be distinguished, also according to three embodiments. Figs. 3A and 3C show that the groove 7 according to any one of the variants of FIGS. 2A to C, may be of semicircular shape arranged on one or the other of the lateral faces 9 or 10, while FIG. 3B shows that grooves 7 can be fitted simultaneously on the two lateral faces 9 and 10.

The presence of the groove 7 improves the dosage and the choice of lubricant. It is possible to use an oil. In fact, when the lubricant is pushed towards the exit edge of the impulse plane 4 by the impulse edges of the teeth of the anchor wheel which sweep one after the other the surface 4, the mass which comes to extend over the surface 8 penetrates into the groove 7 and, attracted by capillarity, irrigates the rest plane 5 again. There is thus established a continuous circulation of the lubricant in a closed circuit.

The shapes and dimensions indicated above, only by way of example, for the groove or grooves, are in no way limiting. Thus the groove 7 could have other profiles, rounded or polygonal; it could also be convergent-divergent. The grooves could also have a non-rectilinear layout, in order to widen the field of possibilities as regards the choice and the dosage of the lubricant.

In other embodiments, provision could be made to connect the inlet of the groove 7 with the face 8 by a chamfer or a rounding. One could also use the groove 7 as a reserve of grease by filling it during the lubrication operation.

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CH 685 463G A3

The groove 7 could also go from the face 8 to the plane 4 or else from the face 8 to the plane 5 or else according to these two paths at the same time.

Thus, in the anchor pallet according to the invention arranged as indicated, the lubrication problems mentioned above are solved, two zones of the pallet, adjacent to the ends of the friction path of the anchor wheel, communicate together thus allowing a circulation in a closed circuit of a relatively fluid lubricant. This will move downstream along the friction path when it is pushed back by the anchor wheel and will return to the amot by the capillary groove (s).

In order to further improve lubrication, the surface areas adjacent to said one or more grooves can be treated in order to promote or slow down the spreading of the lubricant.

Claims (9)

Claims 1. Anchor pallet (2) for a clockwork movement, characterized in that it comprises at least one groove (7) arranged on at least one of the lateral faces (9, 10) of said pallet, said or said grooves forming one or more capillary channels connecting the rear face (8) of the pallet with the rest plane (5). 2. Anchor pallet according to claim 1, characterized in that the profile of the groove (s) (7) is rounded. 3. Anchor pallet according to claim 2, characterized in that the profile of the groove (s) (7) is semi-circular. 4. Anchor pallet according to claim 1, characterized in that the profile of the groove (s) (7) is polygonal. 5. Anchor pallet according to one of the preceding claims, characterized in that the groove or grooves (7) have a constant section over their entire length. 6. Anchor pallet according to one of claims 1 to 4, characterized in that the groove or grooves (7) have a section whose dimension varies over the length of said groove. 7. Anchor pallet according to one of the preceding claims, characterized in that the groove or grooves (7) extend parallel to the impulse plane (4). 8. Anchor pallet according to one of the preceding claims, characterized in that it is made of synthetic stone. 9. Anchor pallet according to one of the preceding claims, characterized in that the surface areas adjacent to said one or more grooves (7) are treated to promote or slow the spreading of the lubricant. 5 10 15 20 25 30 35 40 45 50 55 60 65 4