Title: Machine for folding flexible sheets

Abstract: A machine for folding flexible sheets, such as paper, and more particularly blueprints and the like, comprises a plurality of fold stations, each including a pair of pinch rolls and a deflector selectively operable to cause a sheet of material fed to the machine to be fed between a pair of pinch rolls and thus folded, or to be fed past the pinch rolls and not folded, an infeed tray to feed a sheet of material to the fold stations, a plurality of first sensing devices on the infeed tray spaced apart in the direction of travel of the sheet to sense the presence of a sheet of material on the infeed tray, and a sensing device at each fold station to sense the presence of a sheet being folded at that station, said sensing devices operatively connected with the deflectors to operate the deflectors to cause the sheet of material to be folded at the next succeeding fold station only when the sheet of material is sensed simultaneously by the spaced sensing devices on the infeed tray and the sensing device at the next preceding folding station.

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Inventors: Brown, Frank H. (Norwich, NY, US)

Application Number: 535357
Filing Date: 1974-12-23
Publication_date: 1976-08-17
Assignee:
Primary Class(es): 493/14 493/19, 493/421
Other Classes:
US Patent Ref:

2389458	Nov, 1945	Preston	270/80.
3211448	Oct, 1965	Stoothoff	270/68.
3712610	Jan, 1973	Garrone	270/79.

Other Refs:
Primary Examiner: Burr, Edgar S.
Assistant Examiner: Heinz, A.
Attorney: Shoemaker and Mattare, Ltd.