# US 11,442,409 B2 · Device for adjusting a retrograde timepiece display > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,442,409 B2 - Document ID: US11442409B2 - Status: Granted - Kind: B2 - Application number: 16/589,244 - Filed: 2019-10-01 - Published: 2020-04-16 - Granted: 2022-09-13 - Earliest claimed: 2018-10-12 - Assignees: Blancpain SA - Applicants: Blancpain SA - Inventors: Mehdi Denden - Web page: https://patentgrep.com/patent/US11442409B2 ## CPC - G04B 19/02: Back-gearing arrangements between gear train and hands {(transmissions in general G04B13/00)} - G04B 19/082: {varying from the normal closed scale} - G04B 19/04: Hands; Discs with a single mark or the like {(moving indicating arrangements which have scales or numbers with stationary hands or reading means G04B19/20; optical projection of the position of the hands G04B19/34)} - G04B 35/00: Adjusting the gear train, e.g. the backlash of the arbors, depth of meshing of the gears {(adjusting the escapement G04B15/12)} - G04B: MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS (spring- or weight-driven mechanisms in general F03G; electromechanical clocks or watches G04C; electromechanical clocks with attached or built-in means operating any device at pre-selected times or after predetermined time intervals G04C23/00; clocks or watches with stop devices G04F7/08) ## Abstract A retrograde display mechanism including a main plate and a rack pivoting on a first arbor about a first axis centring its toothing, and including a sensing element following a cam pivoting on a second arbor about a second axis, the position of the first pivot axis and/or of the second pivot axis is adjustable with respect to the main plate with an adjustment plate carrying the first arbor and/or respectively the second arbor, and movable with at least one degree of freedom with respect to the main plate whose position with respect to the main plate is adjustable by an adjustment control device or an eccentric screw secured to the main plate and cooperating with a notch in the adjustment plate, or vice versa. ## Claims ### Claim 1 A retrograde timepiece display mechanism, comprising: a main plate; and at least one rack pivotally mounted on a first arbor pivoting about a first pivot axis and comprising a toothing centred on the first pivot axis, the at least one rack including a sensing finger arranged to follow a periphery of a cam comprised in the retrograde timepiece display mechanism and which is pivotally mounted on a second arbor pivoting about a second pivot axis, wherein a position of the first pivot axis and/or of the second pivot axis is adjustable with respect to the main plate with an adjustment plate carrying the first arbor and/or the second arbor, respectively, and is movably mounted with at least one degree of freedom with respect to the main plate, and wherein the position with respect to the main plate is adjustable by an adjustment control means, in order to adjust a total angle of the retrograde timepiece display mechanism. ### Claim 2 (depends on 1) The retrograde timepiece display mechanism according to claim 1, wherein the adjustment plate comprises at least one trunnion movable in an oblong hole comprised in the main plate, and/or at least one oblong hole arranged to cooperate with a trunnion comprised in the main plate. ### Claim 3 (depends on 2) The retrograde timepiece display mechanism according to claim 2, wherein the adjustment plate further comprises two trunnions each movable in an oblong hole comprised in the main plate. ### Claim 4 (depends on 3) The retrograde timepiece display mechanism according to claim 3, wherein the first arbor and/or the second arbor forms one of the trunnions. ### Claim 5 (depends on 2) The retrograde timepiece display mechanism according to claim 2, wherein the adjustment plate includes two oblong holes each arranged to cooperate with one trunnion comprised in the main plate. ### Claim 6 (depends on 1) The retrograde timepiece display mechanism according to claim 1, further comprising at least one play compensation spring arranged to always push the first arbor and/or the second arbor in a same direction with respect to the main plate and to retain the adjustment plate. ### Claim 7 (depends on 1) The retrograde timepiece display mechanism according to claim 1, wherein the adjustment control means comprises an eccentric screw secured to the main plate and arranged to engage with a notch comprised in the adjustment plate, or a notch provided in the main plate and arranged to engage with an eccentric screw fixed to the adjustment plate. ### Claim 8 (depends on 7) The retrograde timepiece display mechanism according to claim 7, wherein the adjustment control means further comprises only a single eccentric screw. ### Claim 9 (depends on 1) The retrograde timepiece display mechanism according to claim 1, wherein the sensing finger is further arranged to move back into direct contact with the cam after a return-to-zero operation, the cam forming an end of travel stop for the sensing finger. ### Claim 10 (depends on 1) The retrograde timepiece display mechanism according to claim 1, wherein the adjustment control means is arranged to control a translation of a centre of rotation of the sensing finger formed by the first pivot axis. ### Claim 11 (depends on 1) The retrograde timepiece display mechanism according to claim 1, wherein the adjustment control means is arranged to control a rotation of a centre of rotation of the sensing finger formed by the first pivot axis. ### Claim 12 (depends on 1) The retrograde timepiece display mechanism according to claim 1, wherein the adjustment control means is arranged to control a translation of a centre of rotation of the cam formed by the second pivot axis. ### Claim 13 (depends on 1) The retrograde timepiece display mechanism according to claim 1, wherein the adjustment control means is arranged to control a rotation of a centre of rotation of the cam formed by the second pivot axis. ### Claim 14 (depends on 1) A timepiece movement including at least one retrograde timepiece display mechanism according to claim 1. ### Claim 15 (depends on 1) A timepiece including at least one retrograde timepiece display mechanism according to claim 1. ### Claim 16 (depends on 15) The timepiece according to claim 15, wherein the timepiece is a watch.