Method and device for cross-folding signatures

Details Method and device for cross-folding signatures Method and device for cross-folding signatures

1999-10-20

2001-05-22

Gerrity, Stephen F. (Department: 3721)

Manufacturing container or tube from paper; or other manufacturi

Bending

Folding

C493S426000, C493S434000, C493S442000, C493S360000, C493S431000

Reexamination Certificate

active

06234947

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a method for the transverse folding of signatures as well as to an associated device. This method and device pre-folds signature prior to finish-folding them.
DESCRIPTION OF THE PRIOR ART
It is generally known to produce transversely folded products wherein a plurality of paper ribbon sections conducted one above the other, and called signatures, are respectively pushed into folding jaws of a folding jaw cylinder by means of folding blades of a folding blade cylinder.
Only transversely folded products of up to 96 pages can be produced by means of such folding devices, because otherwise the inner and outer portions of the transversely folded product would be damaged.
DE-OS 21 46 013, describes a device for longitudinally folding sheets of paper. Here, sheets of paper are pre-folded between a rotating circle-shaped folding blade and an annular groove of a rotating pre-fold cylinder, and are subsequently finish-folded by means of a pair of belts.
DE 41 20 630 C1 discloses a device for transversely folding a web in a rotary printing press. Here, a folding blade cylinder and a folding jaw cylinder are arranged for making a first transverse fold.
SUMMARY OF THE INVENTION
The object of the present invention is based on providing a method, as well as an associated device for producing a transverse fold.
In accordance with the invention, this object is attained by providing the signatures with a pre-fold through the use of pre-fold clamping elements, such as folding jaws. The pre-folding signatures are then conducted to a pair of rotating folding rollers where they are finish-folded.
The advantages which can be achieved with the present invention rest, in particular, in that thick folded products of up to 192 pages can be transversely folded with comparatively little force. An exact transverse fold can be exactly determined in that the center of the fold can be exactly defined, particularly since both halves of the signatures are respectively drawn into the pre-fold clamping gap by the same amount of the insertion of the folding blade. Since transverse folding takes place in two stages, pre-folding and finish-folding, the forces respectively required for one folding step are reduced. The lateral faces of the pre-fold product, which are in contact with the pre-fold clamping gap, are handled free of damage because of the employment of cylindrical pre-fold clamping elements of the pre-fold clamping system which are operating in a jaw-like manner. In the same way, the finish-folding of the pre-folded product of up to 192 pages takes place free of damage because of the employment of folding rollers.


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