DRIVING COMPONENT FOR AN ADJUSTING INSTRUMENT

A drive component comprising a first rotation part and a second rotation part arranged to rotate together around a common central axis with respect to each other around that central axis. The drive component further comprises a rotation limiter operative between the two rotation parts, which limits rotation between them. The rotation limiter is so arranged that when the first rotation part is driven to rotation, the first rotation part after traversing a free angular stroke carries the second rotation part in a mutual angular position determined by the rotation limiter, i.e. the carry-along angle, along in rotation. The rotation limiter comprises an indexer energized by rotation of the first and/or second rotation part, so that in successive driving cycles on the drive component the carry-along angle is indexed and the rotation parts in successive driving cycles differ in mutual angular position at carry-along.