Portable medical data recorder

Claim 1

A portable medical data strip chart recorder comprising: a supply roller on which the strip chart is stored; a platen across which the strip is drawn at a predetermined linear velocity and tension; and drive roller means for drawing the strip across the platen including integral motive means for rotating the roller means at a selected angular velocity, the drive roller means including a hollow shaft about which is affixed a concentric cylinder pad member of selected durometer, DC motor means mounted internally and concentrically of the shaft and affixed thereto having a DC motor axially aligned with a gearbox of selected ratio for providing the selected angular velocity and wherein the DC motor stator is affixed to the drive shaft and the rotor held stationary thereby causing the shaft and stator to rotate about the rotor at the selected angular velocity, the recorder includes a frame member to which the rotor is affixed and bearing members mounted to the frame in which marginal ends of the shaft are mounted, and a DC power source energizes the DC motor through brush means contacting means on one of the bearing members.