Abstract: A tourbillon (1) with a rotation cage which is rotatably arranged about a tourbillon axis is provided. The rotation cage mounts a balance wheel (3) and an escapement with an escape wheel (8) and a lever. The tourbillon is characterised in that the rotation cage comprises a bearing wheel (22) which is mounted by bearing elements (13) which engage peripherally on a running surface (11) of the bearing wheel (22).

Abstract: A date display device with an annual calendar function comprises the following elements: a drive wheel (8) which is coupled to a mechanical movement, a driving device which is driven by the drive wheel (8), a date wheel (4) which periodically interacts with the driving device and is driven by this and a month wheel (5) which is periodically interacts with the date wheel, as well as a month cam disc (6) which is connected to the month wheel. The driving device comprises a driver (8.1) and a rotation axis (8.3), wherein the driver moves on a path about the rotation axis (8.3) of the driving device and the rotation axis adopts at least two different positions relative to the date wheel (4), wherein in a first position, the driving device advances the date wheel by a single unit and in a second position by a plurality of units and wherein the adopted position depends on the number of days of the month concerned.

Abstract: A date display device with an annual calendar function comprises the following elements: a drive wheel (8) which is coupled to a mechanical movement, a driving device which is driven by the drive wheel (8), a date wheel (4) which periodically interacts with the driving device and is driven by this and a month wheel (5) which is periodically interacts with the date wheel, as well as a month cam disc (6) which is connected to the month wheel. The driving device comprises a driver (8.1) and a rotation axis (8.3), wherein the driver moves on a path about the rotation axis (8.3) of the driving device and the rotation axis adopts at least two different positions relative to the date wheel (4), wherein in a first position, the driving device advances the date wheel by a single unit and in a second position by a plurality of units and wherein the adopted position depends on the number of days of the month concerned.

Abstract: A tourbillon (1) with a rotation cage which is rotatably arranged about a tourbillon axis is provided. The rotation cage mounts a balance wheel (3) and an escapement with an escape wheel (8) and a lever. The tourbillon is characterised in that the rotation cage comprises a bearing wheel (22) which is mounted by bearing elements (13) which engage peripherally on a running surface (11) of the bearing wheel (22).