Title: Stacker for flat sheet material such as banknotes, bank papers, receipts and the like

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Claims: I claim:

1. A stacker for flat material sheets having corners subject to folding, said stacker including a rotatable stacker drum for receiving sheets at a first position and for depositing the sheets on a stack at a second position having a pressure plate for pressing the sheets against the drum, said drum having suction openings in the exterior thereof for adhering the sheets to the drum, said drum having a corner unfolding cutout on the exterior of the drum ahead of the suction openings in the direction of rotation of the drum, said cutout comprising an unfolding face preceded by a run-in face, the projection of said unfolding face on the end of said drum generally forming a radius of said drum, said cutout being so located on said drum as to engage the folded corners of the sheets in the stack when the stack is pressed against the drum by the pressure plate.

2. A stacker as claimed in claim 1 wherein said unfolding face is generally triangular in configuration, said drum radius forming a base side of said triangle, the intersection of the face on the exterior of said drum forming another side of said triangle, and the intersection with said run-in face forming the third side, said run-in face also being generally triangular in configuration and defined by said line of intersection with said unfolding face, a generally arcuate line running from the radially inner end of said drum radius to a tangent on the exterior of said drum, and a generally helical line extending between the apex of said unfolding face and the end of the generally arcuate line.

3. A stacker as claimed in claim 1 wherein said unfolding face lies at an angle of about 45.degree. with respect to the axis of the drum.

4. A stacker as claimed in claim 1 wherein said cutout is located along the edge of said drum.

5. A stacker as claimed in claim 1 wherein said unfolding face and run-in face are planar.

6. A stacker as claimed in claim 1 or 5 wherein said cutout is formed such that the angle between the unfolding face and run-in face is approximately 90.degree..

7. A stacker as claimed in claim 1 wherein said cutout is formed by an insert in the exterior of the drum.

8. A stacker as claimed in claim 1 or 4 having a pair of cutouts for engaging spaced folded corners of the sheets, said cutouts extending toward each other on the exterior of the drum.

Other info:

Inventors: Mitzel, Wilhelm (Neukeferloh, DE, US)

Application Number: 050976
Filing Date: 1979-06-22
Publication_date: 1981-02-17
Assignee: GAO Gesellschaft fur Automation und Organisation mbH (Munich, DE)
Primary Class(es): 271/196 271/314
Other Classes:
US Patent Ref:

1269673	Jun, 1918	Armstrong	271/178.
3380353	Apr, 1968	Mittermayer	271/100.
4073487	Feb, 1978	Schirrmeister et al.	271/196.

Other Refs:
Primary Examiner: Stoner, Jr., Bruce H.
Assistant Examiner:
Attorney: Andrus, Sceales, Starke & Sawall