Abstract: A canned motor pump has a bearing wear sensing device comprising a pair of ring elements having opposing surfaces. The outer element is mounted fixed with respect to the stator and the inner element is mounted for rotation with the rotor. The outer, fixed element is coated with polytetrafluoroethylene. An ohmmeter measures the resistance between the elements through the coating. As the motor bearings wear, displacement of the rotating element causes wear of the coating which reduces its thickness and decreases the resistance between the sensing elements through the coating. One conductor of the ohmmeter is connected directly to the outer, fixed element, and the other ohmmeter conductor is connected through the conductive bearings to the rotating element. Thus, the ohmmeter can dynamically measure the motor bearing wear.

Abstract: The horizontal platform between the feed roll nip and the rotary cutter pelletizing nip in a dicer is arranged to feed soft, limp webs of plastic without crumpling, buckling or sidewise movement by providing a multiplicity of closely spaced ribs and grooves on both the platform and on the hold down fingers, extending in the direction of feed. Friction is thus reduced in the feed direction while sidewise control is maximum for a given feed resistance. To prevent the soft plastic from wrapping around the lower feed roll it is formed with a multiplicity of small diamond protuberances separated by channels.