Sheet-material associating – Associating and folding – Sheet associating
Patent
1996-06-24
1998-07-14
Nguyen, Hoang
Sheet-material associating
Associating and folding
Sheet associating
270 5214, 493423, 493435, 493444, B42C 100, B31F 100
Patent
active
057792321
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a method and a device for producing a longitudinal fold in a signature by supplying the signatures to a longitudinal folding device with the signatures already provided with a pre-fold.
DESCRIPTION OF THE PRIOR ART
Longitudinal folding devices and associated transport systems are known generally from U.S. Pat. No. 4,746,108 as well as from German Patent Publication DE 32 39 799 C2.
A transport device for signatures in a folding device of a web-fed rotary printing press is known from U.S. Pat. No. 5,222,934, by means of which the signatures are guided between two conveyor belts, are aligned at a stop and impact surface and are subsequently inserted into a longitudinal folding device for making a so-called third fold.
SUMMARY OF THE INVENTION
It is the object of the invention to provide a method and a device for producing a longitudinal fold, for example a so-called second longitudinal fold, at high production speeds.
Signatures to be provided with a longitudinal fold are clamped left and right of the intended fold line by, for example, upper and lower conveyor belts and are then moved into position so that they can be longitudinally folded. Various pushing devices are usable to move the signatures into the position where they are longitudinally folded. The signatures to be folded are provided with a pre-fold before they are longitudinally folded.
The following advantages in particular are achieved by present the invention. Time, as well as the alignment of the signatures while they are stopped, is saved because of pre-forming the signatures along an imaginary fold line while they are being conveyed to a folding device. Furthermore, the lift of the folding blade is drastically reduced by pre-forming the signatures. In accordance with further preferred embodiments, an up-and-down moving folding blade is completely omitted, so that the reversal of the direction of movement of the folding blade is no longer needed and in this way the quiet running of the folding device is improved. It is also possible in accordance with another preferred embodiment of the invention to perform the complete folding process in a straight conveying direction of the signatures.
BRIEF DESCRIPTION OF THE DRAWINGS
Several preferred embodiments of the present invention are represented in the drawings and will be described in more detail in what follows. Shown are in:
FIGS. 1 to 3, schematic representations of the method steps of the method of the invention, in accordance with the present invention;
FIGS. 4 to 6, schematic representations of the method steps of the method of the invention for a second preferred embodiment,
FIGS. 7 to 9, front views of devices in accordance with the invention for producing a fold,
FIG. 10, a top view of a further device for producing a fold,
FIG. 11, a lateral view F from FIG. 10,
FIG. 12, a lateral view of an embodiment of a device of the invention, but without an inlet panel and without signatures,
FIG. 13, a section along the line XIII--XIII of FIG. 12.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
In accordance with the method of the invention, a printed product composed of several sheets of paper, for example a signature 71 composed of several sheets, is grasped in a sandwich-like manner at its left and right elements or portions 72, 73 along, and parallel to an intended fold line 74 by holding means, for example by upper and lower conveyor belts 6, 7, 5, 10 as seen in FIG. 1, so that the elements or portions 72, 73 are placed between the conveyor belts 6, 7, 5 and 10. Respectively one element 72 or 73 can also be grasped and guided by several conveyor belts 6, 7, 5, 10, not shown, which are arranged parallel in relation to each other. The left and right elements 72, 73 of the signature 71, originally spaced at a distance b1 are now moved toward each other as far as a pre-selectable inner distance b2, measured across the top sheet of their ends 76, 77. Viewed in profile, the left and right elements 72, 73 of the signature 71 perform a m
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Koenig & Bauer--Albert Aktiengesellschaft
Nguyen Hoang
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