Screw-moving assembly including screw-moving actuator and bias-adjustment mechanism

A screw-moving assembly (100) for a screw assembly (903), the screw-moving assembly (100) comprising:

• a screw-moving actuator (102) including:
• an electric-motor assembly (120);
• a rack-and-pinion assembly (122);
• a shaft assembly (124);
• and
• a piston assembly (126);
• the electric-motor assembly (120) being coupled to the rack-and-pinion assembly (122);
• the rack-and-pinion assembly (122) being coupled to the shaft assembly (124);
• the shaft assembly (124) being coupled to the piston assembly (126);
• and the piston assembly (126) configured to be coupled to the screw assembly (903);
• and
• a bias-adjustment mechanism (104) including a fluid-based actuator (130) having:
• a single piston arrangement (132);
• and
• a fluid-reservoir assembly (134) configured to accommodate, in use, a fluid selected from the group consisting of a liquid and a flowable solid;
• wherein the piston arrangement (132) contacts the fluid-reservoir assembly (134) and the piston arrangement (132) is coupled to the screw-moving actuator (102);
• wherein the screw-moving actuator (102) and the bias-adjustment mechanism (104) are configured to connect to the screw assembly (903);
• the screw-moving actuator (102) is configured to transmit, in use, a screw-translation force (112) to a longitudinal central axis (905) of the screw assembly (903);
• and the bias-adjustment mechanism (104) is configured to transmit, in use, a biasing force (114) to the longitudinal central axis (905) of the screw assembly (903).