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AssigneeWomako Maschinenkonstruktionen GmbH
InventorPaul Fabrig
Estimating the term…
Note books having marginal holes are manipulated prior to insertion of spirals which are to be transformed into binders so as to convert the holes into arcuate passages or into V-shaped passages located in planes each making with a row of holes an angle which approximates the helix angle of the spiral. The conversion takes place in two stages, either at two discrete aligning stations or at a single station. If the conversion takes place at two stations, the holes receive the tips of pairs of mandrels which are thereupon pivoted to convert all holes into V-shaped passages. At the second station, a comb introduces its arcuate prongs into some or all of the V-shaped passages. If the conversion takes place at a single station, some of the holes receive the tips of mandrels introduced from one side and some of the holes receive the tips of mandrels introduced from the other side of the note book. The mandrels are thereupon pivoted to convert all holes into V-shaped passages. The mandrels are also pivoted about axes extending at right angles to the row of perforations in a sheet to place the V-shaped passages into planes making an oblique angle with the planes of the sheets. The oblique angle approximates or matches the helix angle of the spiral.
A method of changing the shape of straight holes consisting of registering perforations provided in an elongated marginal portion of each sheet of a pile of sheets which are about to receive a spiral having a predetermined radius and a predetermined helix angle and serving to hold the sheets of the pile together, comprising the steps of moving at least some sheets of said pile in a first direction substantially at right angles to the respective elongated marginal portions and moving at least some sheets of said pile in a second direction which is substantially parallel to the respective elongated marginal portions whereby the movements of sheets in said first direction result in conversion of said straight holes into substantially V-shaped holes whose configuration resembles the projection of a convolution of said spiral into a plane which is normal to the axis of said spiral, and the movements of sheets in said second direction result in inclination of said holes with respect to the planes of said sheets at an angle which at least approximates said helix angle.
An arrangement for changing the shape of straight holes consisting of registering perforations provided in an elongated marginal portion of each sheet of a pile of sheets which are about to receive a spiral having a predetermined radius and a predetermined helix angle and serving to hold the pile together, comprising a holder having means for gripping the outermost sheets of the pile while leaving at least some of the holes exposed;
Dependencies are inferred from the claim text.