Abstract: Apparatus for removing defective knocked down carton blanks, from a carton erecting machine. In one embodiment opposed sets of tractors for clamping the selected unit and driving it from the conveyor line with moving tractive belts. A sensing device detects carton blanks to be ejected by determining if they can be erected by the machine. Non-conforming blanks are returned to an unerected condition and a control device activated by the sensing device controls activation of the ejecting mechanism to quickly and automatically eject the defective carton blank.

Abstract: Apparatus and method for controlling the discharge of packages from a conveyor utilizing a rotary stop having a generally planar first surface selectively positionable to blocking and discharge positions; in one embodiment, the rotary stop further having a generally volute-shaped second surface connecting edges of the first surface such that the first surface blocks package discharge when the stop is in the blocking position and the second surface permits discharge when the stop is in the discharge position, and in another embodiment the rotary stop having a generally finger-shaped projection, one side of which forms the first surface. A separate ejector is provided to complete discharge of partially discharged packages by pushing such packages off the conveyor.

Abstract: Apparatus for removing defective knocked down carton blanks, from a carton erecting machine. In one embodiment opposed sets of tractors for clamping the selected unit and driving it from the conveyor line with moving tractive belts. A sensing device detects carton blanks to be ejected by determining if they can be erected by the machine. Non-conforming blanks are returned to an unerected condition and a control device activated by the sensing device controls activation of the ejecting mechanism to quickly and automatically eject the defective carton blank.