Patent ID: 8904890

Claim:
A moving device comprising: a driving unit comprising a rotary shaft that is rotatable in a forward direction and a reverse direction by air pressure; a power delivery unit connected to the rotary shaft and adapted and configured to convert rotary motion of the rotary shaft to linear motion; and a brake unit which connects the driving unit and the power delivery unit and selectively brakes the driving unit according to an electrical signal, wherein the power delivery unit comprises: a ball screw connected to the rotary shaft; a rail assembly comprising guide rails where the ball screw is disposed there between; and a slider coupled to the ball screw and slidably mounted to the guide rail, and wherein the brake unit comprises: a connecting member mounted to a brake housing and, which connects the rotary shaft and the ball screw; a rotary plate mounted to the connecting member; a brake pad movably disposed to the brake housing corresponding to the rotary plate; a return spring that is supported by the brake housing and supplies elastic force to the brake pad; and a field coil portion mounted to the housing corresponding to the brake pad.