Servo take-up and pay-off mechanism for cable

The invention relates to a servo control pay-off mechanism, and belongs to the field of mechanical automation. A servo take-up and pay-off mechanism for a cable comprises a servo motor, a threaded centre shaft, a transmission shaft and a reel; the threaded centre shaft is arranged on the transmission shaft in a sleeved manner and is in sliding fit with the transmission shaft; the reel is arrangedon the threaded centre shaft in a sleeved and threaded assembly manner; a linkage plate I and a linkage plate II at the two ends of the threaded centre shaft are connected through guide pillars passing through the reel; the servo motor is connected with one end of the transmission shaft through a flat key; the other end of the transmission shaft is connected with the linkage plate II through bolts; the threaded centre shaft is fixed onto a motor fixed plate, and does not rotate; the threaded centre shaft is provided with a cable outgoing controller; and the reel is driven by the servo motor through the transmission sh