Abstract: A crossed roller bearing in which the rollers are oriented with their axes of rotation effectively crossed perpendicular to each other can be made from four molded plastic parts which are outer and inner split rings where the outer rings are joined side-by-side and have surfaces extending inwardly from the inner periphery which define a outer V-groove. Sets of rollers are connected at corners of one end face by frangible connections to the inside peripheries of each of the grooves and extend radially inwardly away from the inner periphery. The outer periphery of an inside pair of rings also has faces which form a V-groove opposed to the V-groove of the outer rings, when the inner rings are advanced toward each other and joined inside the outer rings. The ends of the inner rings engage the end faces of the rollers and pivot the rollers, preferably about corners in steps on the faces which form the V-grooves which define fulcrums.

Abstract: A relatively low cost, low friction plastic needle bearing assembly uses a unitary plastic circular member with multiple frangibly attached substantially cylindrical needles axially inserted into a cover. A plastic needle separator housing element provides a race and is in axial registration with the frangibly attached needles. A shaft (on which a sprocket of a web feed device or tractor is mounted), upon axial insertion through the member to which the needles are attached, frees the multiple needles from the frangible attachment to the member and ejects the member from the cover leaving the needle bearings captured by the race in the cover.

Abstract: Continuous web material, particularly perforated paper from a roll is dispensed by a system installed, for example, in a computer printer. The system utilizes a roller which is fixed in a frame. The roll of paper has a central opening. The roll is supported on a shaft of diameter smaller than the diameter of the opening. The roll rests on the roller and is supported so that it can pivot and move up and down toward and away from the roller. This support is provided by slots in walls of the frame between which the roll is located and which receive the opposite ends of the shaft and guide the shaft. When the paper is pulled (unwound) from the roll, as by tractors when the paper is edge perforated, the roll climbs along the periphery of the cylindrical roller. The pivotal movement is limited by the walls of the slot and the shaft. When the pull on the paper stops, the roll falls down along the periphery of the roller and rotates in the opposite direction from that in which the paper is pulled from the roll (i.e.