Archibald Gray

US Patent:

39984486, Dec 21, 1976

Filed:

Oct 31, 1974

Appl. No.:

5/519399

Inventors:

Archibald C. Gray - Delaware OH
Douglas I. Van Aernum - Columbus OH

Assignee:

C. I. Industries, Inc. - Delaware OH

International Classification:

B65H 130
B65H 308
B65H 360

US Classification:

271 12

Abstract:

Two vertically aligned elevators, each being adapted to support a stack of blanks, elevate the blanks to a magnetic blank separator and conveyor. A releasable stack support on the upper of the elevators is operative to release the stack held thereby when the stack on the lower elevator is elevated subjacent the stack of the upper elevator, with the lower elevator then supporting the merged stack of both elevators. The stack support on the upper elevator engages beneath the merged stack at a predetermined height of the lower of said elevators to permit the latter to return for another stack. A stack height sensing device automatically alternately controls the vertical movement of the elevators when supporting the merged stack for continuous upward movement of the same for separation and lift-off. A double thickness detector is provided in combination with an ejector to ensure the conveying of only one blank at a time from the top of the stack.