| 摘要 |
The invention relates to a display device having a scale the shape of a circular arc, along which the free end of an indicator that can be rotationally driven about an indicator axis by a measuring mechanism, can be moved. On an axis (1) directly or indirectly driving the indicator axis, a rotatably mounted gear wheel (2) is arranged in a rotatable fixed manner, in the teeth of which the toothing of a wobble gear ring (3), the diameter of which is larger than that of the gear wheel (2), partially engages. Said wobble gear ring (3) is mounted about the axis (1) of the gear wheel (2) such that the wobble gear ring (3) can wobble, is acted upon by spring forces distributed around the periphery of the wobble gear ring (3) in the direction of engagement of the toothing of the wobble gear ring (3) in the teeth of the gear wheel (2), and is fixedly connected to a ferromagnetic ring (4) extending in the direction of rotation of the wobble gear ring (3), having at least two pole shoes (8), which project through independently energizable coils to the outer circumferential surface of the ferromagnetic ring (4), and are arranged with radial clearance to the ferromagnetic ring (4) distributed around the periphery thereof. |
