Walter W Ficker

41858140, Jan 29, 1980

Dec 12, 1977

5/859778

Albert H. Buchmann - Richmond KY
Thomas J. Cochran - LaGrangeville NY
Walter W. Ficker - Fishkill NY
Alfred A. Stricker - Pompano Beach FL
Walter von Kaenel - Pompano Beach FL

International Business Machines Corporation - Armonk NY

B65H 308
B65H 702

271108

A vacuum pick up and transfer head adapted for handling flimsy sheets of material such as spacer sheet and uncured ceramic sheet commonly referred to as green sheet. The vacuum transfer head is of generally rectangular configuration having a sheet contacting lip having vacuum slots formed through the periphery thereof to hold the sheets in place by vacuum pressure. The center of the sheet contacting face is recessed whereby, with a sheet in place and acting as a diaphragm, a central vacuum chamber is also defined. A series of check valves are provided to control application of vacuum and positive pressure to the green sheet for picking the sheet up, retaining it and stripping it. A plurality of probes are provided in the handling head, adapted to selectively project through the sheet contacting surface for detecting green sheet and/or spacer sheet utilized inbetween layers of green sheet. These probes also can act as positive strippers when the head enters a green sheet spacer tray in the process of removing a sheet of spacer or green sheet.

41869184, Feb 5, 1980

Dec 12, 1977

5/859777

Walter W. Ficker - Fishkill NY
David E. Lonser - Light House Point FL
William G. Rance - Del Ray Beach FL
Alfred A. Stricker - Pompano Beach FL
Walter von Kaenel - Pompano Beach FL

International Business Machines Corporation - Armonk NY

B65H 522
B65H 908

271232

A method and apparatus permitting accurate and repeatable steps of location and alignment of flimsy sheets during their transfer. A preferred embodiment comprises a sheet handler and method for aligning unfired ceramic green sheets used in multi-layer ceramic semiconductor packages. The thin flexible sheets are square or rectangular in shape and are provided with holes accurately punched in each corner thereof for alignment purposes. The sheets are moved by a vacuum input transfer head into orientation with a porous registration surface of an alignment fixture. The sheet is then trapped between opposed pressure zones emanating from the input transfer head and through the porous registration surface, respectively. With the sheet stabilized between the pressure zones four bullet-nosed alignment pins are raised from the registration surface into contact with the holes in the corners of the green sheet, thereby accurately aligning the sheet with respect to the alignment fixture. The input transfer head is then withdrawn and an output transfer head picks up the aligned sheet via vacuum means and transfers it to other processing locations.