Paper folding apparatus
First Claim
Patent Images
1. Apparatus for longitudinally folding a paper web moving longitudinally comprising;
- a folding device having entrance and exit ends and an elongated flat central portion lying along the path of the moving web, said device having transversely spaced-apart elongated channels, said channels having entrance channel portions disposed on opposite sides of the central portion and opening toward one another at said entrance end, said channels being longitudinally twisted approximately 180°
along their length and folded over toward one another to overlie said central portion so that said channels open in opposite directions away from one another at said exit end and overlie said central portion to form exit channel portions which open toward one another at said exit end, said exit channel portions communicating with open portions of the twisted channels at the exit end so that the cross-sectional shape of the folding device at said exit end is generally like that of two U'"'"'s positioned with their openings facing one another.
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Abstract
Apparatus for folding an elongated flat paper web to a shape for use in binding one edge of a stack of blueprints or the like includes first and second folding devices positioned so that the paper web moves through the first folding device in one direction and through the second folding device in an opposite direction. The folding devices include cooperating channels, at least one of which is twisted approximately 180° and folded over in order to change the cross-sectional shape of the passage through the folding device between its entrance and exit ends for imparting desired longitudinal folds to the flat paper web.
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Citations
12 Claims
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1. Apparatus for longitudinally folding a paper web moving longitudinally comprising;
- a folding device having entrance and exit ends and an elongated flat central portion lying along the path of the moving web, said device having transversely spaced-apart elongated channels, said channels having entrance channel portions disposed on opposite sides of the central portion and opening toward one another at said entrance end, said channels being longitudinally twisted approximately 180°
along their length and folded over toward one another to overlie said central portion so that said channels open in opposite directions away from one another at said exit end and overlie said central portion to form exit channel portions which open toward one another at said exit end, said exit channel portions communicating with open portions of the twisted channels at the exit end so that the cross-sectional shape of the folding device at said exit end is generally like that of two U'"'"'s positioned with their openings facing one another. - View Dependent Claims (2, 3)
- a folding device having entrance and exit ends and an elongated flat central portion lying along the path of the moving web, said device having transversely spaced-apart elongated channels, said channels having entrance channel portions disposed on opposite sides of the central portion and opening toward one another at said entrance end, said channels being longitudinally twisted approximately 180°
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4. Apparatus for folding a flat paper web to form binders for use in binding the edge of a stack of blueprints or the like, the binders being generally U-shaped and having double thickness leg portions, comprising:
- folding means for longitudinally folding a flat paper web to the shape of the binders as the paper web moves longitudinally through said folding means, image forming means for imparting a visual image to said paper web prior to passage of same through said folding means, a paper web supply roll positioned adjacent said image forming means on the same side thereof as said folding means and below said folding means, said paper web passing in a first direction from said supply roll to said image forming means and in an opposite second direction from said image forming means to said folding means, said paper web passing below and over said image forming means in passing from said supply roll to said folding means, and said paper web passing from said folding means in said first direction over the top of said image forming means to a takeup roll positioned generally below said supply roll, and wherein said folding means comprises a folding device having entrance and exit ends and an elongated flat central portion lying along the path of the moving web, said device having transversely spaced-apart elongated channels, said channels having entrance channel portions disposed on opposite sides of the central portion and opening toward one another at said entrance end, said channels being longitudinally twisted approximately 180°
along their length and folded over toward one another to overlie said central portion so that said channels open in opposite directions away from one another at said exit end and overlie said central portion to form exit channel portions which open toward one another at said exit end, said exit channel portions communicating with open portions of the twisted channels at the exit end so that the cross-sectional shape of the folding device at said exit end is generally like that of two U'"'"'s positioned with their openings facing one another. - View Dependent Claims (5)
- folding means for longitudinally folding a flat paper web to the shape of the binders as the paper web moves longitudinally through said folding means, image forming means for imparting a visual image to said paper web prior to passage of same through said folding means, a paper web supply roll positioned adjacent said image forming means on the same side thereof as said folding means and below said folding means, said paper web passing in a first direction from said supply roll to said image forming means and in an opposite second direction from said image forming means to said folding means, said paper web passing below and over said image forming means in passing from said supply roll to said folding means, and said paper web passing from said folding means in said first direction over the top of said image forming means to a takeup roll positioned generally below said supply roll, and wherein said folding means comprises a folding device having entrance and exit ends and an elongated flat central portion lying along the path of the moving web, said device having transversely spaced-apart elongated channels, said channels having entrance channel portions disposed on opposite sides of the central portion and opening toward one another at said entrance end, said channels being longitudinally twisted approximately 180°
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6. Apparatus for folding an elongated web of paper moving longitudinally comprising;
- first and second spaced folding devices through which a web of paper passes successively for imparting different longitudinal folds thereto, said first folding device having entrance and exit ends, said exit end having a width approximately one-half the width of said entrance end, said first folding device including a pair of spaced elongated channels having longitudinal openings positioned in facing opposed relationship at said entrance end and being positioned facing outwardly in opposite directions at said exit end, and said channels between said entrance and exit ends being twisted approximately 180° and
transversely displaced, said second folding device being spaced after said first folding device to fold said web further. - View Dependent Claims (7, 8, 9, 10, 11, 12)
- first and second spaced folding devices through which a web of paper passes successively for imparting different longitudinal folds thereto, said first folding device having entrance and exit ends, said exit end having a width approximately one-half the width of said entrance end, said first folding device including a pair of spaced elongated channels having longitudinal openings positioned in facing opposed relationship at said entrance end and being positioned facing outwardly in opposite directions at said exit end, and said channels between said entrance and exit ends being twisted approximately 180° and
Specification