Driving component for an adjusting instrument

A drive component, comprising:

• a first rotation part;
• a second rotation part;
• and
• a rotation limiter comprising an indexer, wherein
• the first rotation part and the second rotation part are arranged to rotate together around a common central axis and to rotate around the common central axis with respect to each other,
• the rotation limiter is operative between the two rotation parts, which limits rotation between the rotation parts,
• 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 along in rotation at a carry-along angle determined by the rotation limiter, wherein the carry-along angle is a mutual angular position between the first rotation part and the second rotation part when the second rotation part is carried by the first rotation part,
• wherein the indexer is energized by rotation of at least one of the first rotation part or the 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 relative to one another,
• wherein in each driving cycle the first rotation part is driven from rest to rotation and after carrying along the second rotation part has come to rest again.