KR-102964729-B1 - MECHANICAL HOROLOGICAL MOVEMENT COMPRISING A WHEEL SET CARRYING A DISPLAY MEMBER AND PROVIDED WITH A BRAKING DEVICE

KR102964729B1KR 102964729 B1KR102964729 B1KR 102964729B1KR-102964729-B1

Abstract

The mechanical watch movement comprises a barrel, an escape wheel set associated with a mechanical resonator, a display wheel set (30) intended to carry a display member, particularly a chronograph hand (48), and rotatably driven by the barrel, and a braking spring (10) arranged to generate a braking torque on the display wheel set when the display wheel set receives a rotational driving torque to prevent shaking of the display member. The mechanical watch movement further comprises an intermediate part, particularly a washer (8), positioned between the arbor (36) of the display wheel set and the braking spring, which is mounted to rotate freely on the arbor. The intermediate part and the braking spring are arranged so that the intermediate part remains in a stopped and non-rotating state during normal operation. The braking spring applies a total pressure across the intermediate part in the direction of the arbor to generate the braking torque.

Inventors

비쓰브로트 밥티스트
필리퐁 다비

Assignees

에타 쏘시에떼 아노님 마누팍투레 홀로게레 스위세

Dates

Publication Date: 20260513
Application Date: 20240426
Priority Date: 20230510

Claims (17)

A mechanical viewing movement (2) comprising a barrel, an escape wheel set (58) associated with a mechanical resonator, a display wheel set (30) including an arbor (36) intended to carry a display member (48), and a braking device (6) associated with the display wheel set and including a braking spring (10, 10A, 10B, 11) and an intermediate part (8, 68, 78) arranged between the braking spring and the arbor of the display wheel set, wherein the display wheel set can be rotatably driven by the barrel but does not form part of a gear train from the barrel to the escape wheel set, and the braking spring is arranged to generate a braking torque on the display wheel set through the intermediate part to which the braking spring presses as soon as the display wheel set receives a rotational driving torque, and The above intermediate component and the above braking spring are arranged so that the above intermediate component is maintained in a stopped and non-rotating state during normal operation; A mechanical lateral movement, characterized in that the above intermediate part has a lateral surface (9) and a bearing surface (25) that apply pressure to the rotating surface (35) of the above arbor, and the braking spring applies a total pressure toward the arbor to generate a frictional force between the rotating surface and the lateral surface that generates the braking torque.
In Article 1, A mechanical observation movement characterized by the above intermediate parts (8, 68, 78) exclusively applying radial pressure to the arbor (36) of the display wheel set (30).
In Article 2, A mechanical lateral movement characterized in that the above arbor defines the central axis (42), the rotational surface (35) is cylindrical and extends axially, and the lateral surface (9) extends axially.
In Article 2, A mechanical directional movement characterized in that the above braking spring (10, 10A, 10B, 11) is a wire spring or strip spring whose longitudinal axis is located in a geometric plane parallel to the general plane (50) of the movement.
In Article 4, A mechanical lateral movement, wherein the braking spring (10, 10A, 10B, 11) is arranged such that the middle portion of the braking spring applies the pressing force to the bearing surface of the middle portion (8, 68, 78); and the two end portions of the braking spring, each located on both sides of the middle portion, are stressed by the two spaced portions (16, 20) of the lateral movement so that the middle portion applies the pressing force to the bearing surface.
In Article 5, A mechanical lateral movement characterized in that the braking spring (10, 10A, 10B) is not fastened to the lateral movement, and the two end portions of the braking spring are held under tension by the spaced portions (16, 20) of the lateral movement that press in two directions in the geometric plane.
In Article 6, A mechanical directional movement characterized in that the above intermediate component and the above braking spring are configured such that their relative positions do not change over time, even in the case of possible longitudinal displacement of the braking spring as a result of acceleration received by the movement in its general plane.
In any one of paragraphs 5 through 7, A mechanical observation movement characterized in that the above movement includes an eccentric (20) having a rotation axis perpendicular to the geometric plane, and the eccentric is arranged to apply pressure to the braking spring (10, 10A, 10B, 11) so as to change the pressure applied to the intermediate part (8, 68, 78) by the braking spring by rotation around the rotation axis.
In any one of paragraphs 1 to 7, A mechanical lateral movement characterized in that the above intermediate part is a washer (8) having a central opening through which the arbor (36) of the display wheel set passes, and the lateral surface (9) of the washer is defined by the cylindrical surface of the central opening.
In Article 8, A mechanical lateral movement characterized in that the above intermediate part is a washer (8) having a central opening through which the arbor (36) of the display wheel set passes, and the lateral surface (9) of the washer is defined by the cylindrical surface of the central opening.
In Article 9, A mechanical directional movement, characterized in that the washer (8) has a groove (24) in its periphery into which at least a portion of the braking spring (10), which defines the bearing surface (25) and applies the pressure in the direction of the arbor, is inserted.
In Article 10, A mechanical directional movement, characterized in that the washer (8) has a groove (24) in its periphery into which at least a portion of the braking spring (10), which defines the bearing surface (25) and applies the pressure in the direction of the arbor, is inserted.
In any one of paragraphs 1 to 7, A mechanical directional movement characterized in that the intermediate part (8) is arranged on a support (4) having a contact surface (26) positioned opposite to the bearing surface (25) and oriented horizontally on the periphery of the intermediate part, and the intermediate part and the braking spring can be pre-assembled in the mechanical directional movement before assembling the display wheel set (30) with the intermediate part leaning against the contact surface.
In Article 13, The above contact surface (26) is arranged such that, following the pre-assembly of the intermediate part (8) and the braking spring (10), the central cylindrical opening within the intermediate part has at least one area that overlaps with the central cylindrical opening within a rotatable or fixed pipe (44) or tube into which a part of the arbor (36) of the display wheel set (30) is inserted, and the arbor can penetrate the two central circular openings without initially needing to apply a radial force to the intermediate part when the display wheel set is mounted on the mechanical viewing movement.
In any one of paragraphs 1 to 7, A mechanical lateral movement characterized in that at least a portion of the arbor (36) defining the rotational surface (35) is made of steel or a copper alloy, and at least a portion of the intermediate part (8) defining the lateral surface (9) is made of copper alloy or steel, respectively.
In any one of paragraphs 1 to 7, A mechanical lateral movement characterized in that at least a portion of the arbor (36) defining the rotational surface (35) is made of steel or a copper alloy, and at least a portion of the intermediate part (8) defining the lateral surface (9) is made of a polymer.
In any one of paragraphs 1 to 7, A mechanical lateral movement characterized in that at least a portion of the arbor (36) defining the rotational surface (35) is made of steel or a copper alloy, and at least a portion of the intermediate part (8) defining the lateral surface (9) is made of a material containing ceramic, or ruby or zirconia, or gold or nickel, and forms an outer layer that at least partially covers the intermediate part.

Description

Mechanical horological movement comprising a wheel set carrying a display member and provided with a braking device The present invention relates to a mechanical viewing movement comprising a wheel set carrying a display member, particularly a hand, and an anti-trembling device (also referred to as a vibration prevention device) formed by a braking device acting on the wheel set to prevent the display member from shaking when rotating and, suitably, floating when stopped. Document CH 580301 discloses a vibration damping device for a timekeeping wheel set, particularly a chronograph wheel set (hereinafter also referred to as a "chrono wheel set"), comprising an arbor fitted with a pinion that meshes with a clutch wheel (hereinafter referred to as a "drive wheel") forming a coupling device for a chronograph mechanism. It should be noted that the arbor fitted with a pivot to guide rotation is also referred to as a "shaft" in watchmaking. The anti-vibration device for the seconds hand of the chronograph function is formed by a friction device, which includes a wire spring that leans obliquely against the arbor, the arbor having a truncated conical shoulder for this purpose, and the wire spring having a bearing point at an angle formed by this shoulder and a circular cylindrical part, the diameter of which corresponds to the minimum diameter of the shoulder, and at this point, an oblique force is applied to the arbor so that the teething of the pinion press against the drive wheel, and the lower annular surface of the arbor, which is opposite to the shoulder and perpendicular to the axis defined by the arbor, presses axially against the bearing on which the chronograph wheel set pivots. The spring is designed to be straight when there is no stress. The spring is fastened to the frame of the movement at the first end, while a portion of the second end is under tension and presses against the arbor as described above. For many reasons, such anti-vibration devices raise issues regarding the control of the moment of frictional force applied to the chronograph wheel set. Furthermore, there is no way to adjust this moment of frictional force. Subsequently, when the chronograph hand (chrono hand) is removed, the spring receives an axial force that can damage the spring. Document DE 6800934 U describes a solution for improving the control of the moment of frictional force applied to a second wheel set. According to the teachings of this document, a wire spring or strip spring is secured at its first end to a plate suspended by a rivet having a head with a threaded slot, arranged on one side of a bar opposite to the side where the plate is located, by riveting technique. The rivet has an intermediate cylinder that is inserted into a hole in the bar in a friction fit to allow the rivet and, thus the plate and, thus the first end of the spring, to undergo a specific rotation with the aid of a tool. The second end of the friction spring is free and rests radially on a plastic washer that is forced-fitted/pressed-fitted onto the arbor of the second wheel set, and this washer has a lateral groove in which the second end of the spring is positioned. This system is very difficult to assemble in a lateral movement. First, the friction spring must be secured to the plate by inserting the first end portion of the friction spring into the slot and then applying material to the two edges of the slot to perform the first riveting operation. Then, the plate with the friction spring must be moved inward into the bar after inserting a rivet into the hole of the bar from the other side. After that, the end of the rivet must be crushed, and a second riveting operation must be performed to fasten the plate to the rivet. It can be seen that there is a high risk of damage to the friction spring through two consecutive riveting operations at each step of assembling the friction spring to the plate and then to the bar. Finally, the bar, plate, and friction spring assembly are assembled in a lateral movement a priori simultaneously with inserting the pivot of the arbor of the first wheel set carrying the groove washer into the bearing arranged on the relevant bar. This assembly requires that the spring not be stacked on top of the grooved washer, as the spring is rigidly connected to the bar and the grooved washer, designed to accommodate the free end of the spring under tension, is rigidly connected to the arbor. Therefore, there exists a first assembly/disassembly position for the spring and a second operating position where the free end of the spring is introduced into the groove within the washer and the spring is tensioned. To move from one position to another, the watchmaker must use a tool to act on the rivet head, which causes the spring to lose tension when removed for maintenance. As a result, the braking moment must be readjusted every time the seconds wheel set is assembled. The assembly method described here is difficult to impleme