Patent ID: 9555908
Date: 2017-01-31
CPC Classifications: B65B

Claim:
1. A self-propelled wrapping machine that is movable around a product for wrapping said product with a film of synthetic plastic material, comprising (a) at least one directional wheel connected with said wrapping machine for rotation around a vertical rotation axis to enable said wrapping machine to follow a desired movement path; (b) a steering assembly connected with said at least one directional wheel for steering said at least one directional wheel along said movement path; (c) a spring connected with said steering assembly for exerting a first force along an application direction to generate a first torque on said steering assembly to induce said steering assembly to rotate said at least one directional wheel around said vertical rotation axis according to a set direction; and (d) an actuator assembly connected with said spring for displacing said spring between a first operating configuration wherein said spring exerts said first torque and a first non-operating configuration wherein said spring exerts a second torque less than said first torque.