On-load tap changer of a step switch

In an on-load tap changer of a step switch comprising

• a force-storage unit which has a charging slide continuously movable by a bidirectionally rotatable drive shaft and an output part that when tripped suddenly follows the movement of the charging slide,
• a switching shaft rotatable by the tripped output part, and
• respective switching means for each phase that are each actuatable by respective actuating elements that again coact with edges of respective concentric cams rotatable by the switching shaft, the improvement wherein
• an axially movable switching unit is mounted on the switching shaft,
• the switching unit carries cam disks for actuating the switching means,
• each cam disk is subdivided into an upper and a lower subdisk with different shapes, and
• the switching unit is movable in a direction dependent on the rotation direction of the drive shaft into an upper or a lower position wherein in the upper position of the switching unit all of the lower cam subdisks and in the lower position of the switching unit all of the upper cam subdisks engage the actuating elements to actuate the respective switching means.