Abstract: A transport conveyor for workpieces, pallets, or workpiece carriers which includes a drive transmission that includes a traction coupling that interrupts the transfer of torque and driving force to the conveyor rollers, belt or the like upon an interruption in the movement of the workpieces, pallets or workpiece carriers on the conveyor. The transmission traction device includes contact-free couplings which can be integrated in the rollers or be mounted outside the drive path of the rollers. Because the couplings operate without physical contact, they are free from wear commonly incurred in the drive transmission as an incident to the interruption of workpiece movement.

Abstract: A roller for a roller conveyor which has an integral base body (3) made of thermoplastic which is symmetric to an axis of rotation (9) and which contains a through passage (11) coaxial to the axis of rotation and is defined by two face sides (7, 8). The roller has a flanged pulley (4) integral to the base body (3) which is coaxial to the axis of rotation, a covering (34) arranged on the supporting section (5) which forms a running surface for work pieces or work piece supports, a tooth arrangement (45) constructed on the driving section (6) for at least one drive means active in a positive-locking manner, and bearings (17, 18, 29) arranged in the through passage (11) for rotatable support of the roller (1) on a shaft member (48).

Abstract: To provide for precise vertical movement without guide elements of a lifting frame, a main shaft (21) has a plurality of cam disks, such as eccenters (26) located thereon, which are coupled to the lifting frame, directly, or by means of double-arm levers. The eccenters may be placed 180.degree. offset from each other on the shaft, with one eccenter follower or cam follower (27) secured to the frame at a first longitudinal position, and other eccenters or cam followers (27) coupled to double-arm levers (33), pivotable about a fixed pivot axis (36) and having the remote ends coupled to the lifting frame (8) at a position remote from the first attachment position. Synchronous movement of the connections to the lifting frame (8) is ensured by using only one drive shaft, so the movement can be, precisely, up and down, while maintaining the frame horizontal.