Abstract: A roller track is arranged in sections in that individual groups of carrier rollers can be selectively drivingly connected to and disconnected to and from a drive belt for section stop-and-go operations permitting a buffer location for each section, there being vertically displaceable belt rollers for engaging the belt to obtain driving connection to and disconnection from carrier rollers. The track includes a plurality of control rollers, control bars and control cams. The belt rollers are eccentrically mounted in the control rollers such that depending upon the angular position of the control rollers the respective belt rollers are lifted or lowered for engagement with or disengagement with the belt.

Abstract: A conveying roller device having holding locations for the material to be transported in which switch bars (4) extend above the supporting rolls (2) which are mounted between side plates (1) and are driven at the holding positions A, B and C by the drive belt (3). Drive belt (3) is pressed by the belt rolls (5), in raised position, against the supporting rolls (2). Holding position A is the frontmost holding position of the conveying device and switch plate (10A) thereof has been brought into preparatory position by an external control element in the form of a valve or limit switch, i.e. the external control element has, in a pneumatic or electrical logic circuit, created the prerequisite for the holding process which is to take place. This prerequisite can also be established in that a switch bar (4) has been displaced by a piece of material to be transported at a second holding position in front of a first holding position A.

Abstract: A hesitation device is provided in a material conveying roller conveyor system which is simple and inexpensive in construction, while at the same time allows accumulation of conveyed materials with any damaging or disturbing effect upon the conveyed material. This is achieved by providing unbalancing weights in the rollers of the conveyor in the stoppage or hesitation area in combination with a driving belt for the rollers having areas of differing coefficients of friction.