Manufacturing container or tube from paper; or other manufacturi – Bending – Folding
Patent
1998-06-24
2000-02-01
Sipos, John
Manufacturing container or tube from paper; or other manufacturi
Bending
Folding
493432, 493357, 493 23, B31F 108, B31B 114
Patent
active
060197145
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a folding apparatus of a rotary printing press for cross-folding printed products, in particular printed products of variable section lengths.
DESCRIPTION OF THE PRIOR ART
A device with a signature divider for separating the signatures into two signature paths is known from EP 0 054 963 B1.
EP 0 055 405 A1 describes a belt section for transporting and slowing-down folded products between two successive stations of a folding apparatus. In this prior art device, two successive sections of belt systems are provided, which are driven at speeds which are stepped in respect to each other.
SUMMARY OF THE INVENTION
It is the object of the present invention to create a folding apparatus.
In accordance with the invention this object is attained by providing a folding apparatus for rotary printing presses with at least one cross-folding device for folding individual signatures. These signatures are divided into two signature paths by a signature divider. Each of these signature paths is provided as a signature deceleration section whose speed can be controllable.
The advantages which can be achieved by the present invention reside in particular in that at the high production speeds of a folding apparatus with variable section lengths, damage to the signatures on their way from the cutting devices to the cross-folding devices is prevented. The acceleration of signatures of shorter section length in particular is not required because of dividing the signatures into two product flow paths. It is therefore not necessary to accelerate shorter signatures to the gripper distance of a collection cylinder, such as has been necessary in connection with folding apparatus known in the prior art. The gap created by the division of the product flow is used for slowing down the partial flows in order to perform the cross-folding process at this reduced speed. Accordingly, cross-folding of the signatures in the product flow paths takes place at a lesser speed in comparison with the inlet speed, so that the effects of the whip effect are reduced or lessened and no longer have a damaging effect on the folded product.
BRIEF DESCRIPTION OF THE DRAWINGS
A preferred embodiment of the present invention is represented in the drawings and will be described in more detail in what follows.
Shown are in:
FIG. 1, a detail of a lateral view of the folding apparatus in accordance with the invention;
FIG. 2, a representation of enlarged details of a signature divider in accordance with FIG. 1 with signatures;
FIG. 3, a representation analogous to FIG. 2, but with a different signature length;
FIG. 4, a schematic representation of a register-maintaining position regulation of cylinder elements of a folding apparatus.
DESCRIPTION OF THE PREFERRED EMBODIMENT
A folding apparatus 1 of a rotary printing press has a draw-in roller group 2 for drawing in a printed and possibly longitudinally folded product train 3. A transverse cutting device 7, which consists of two pairs of cutting cylinders 4, 6 placed one after the other, is provided underneath or after, in the direction of product travel the draw-in roller group 2. The first cutting cylinder pair 4 makes a transverse perforating cut in the product train 3. The remaining webs are cut through by the second cutting cylinder pair 6, so that a complete cut is created. A signature divider 10 is disposed underneath the transverse cutting device 7, and alternatingly assigns all signatures 41, 42, 43, 44 cut from the product train 3 to one of two product flow paths A, B as seen in FIG. 2. A drivable belt system 11, 12 surrounds each cutting cylinder of the cutting cylinder pair 6, as well as each changing or divider member 33, 34 of the signature divider 10. The drivable belt system 11, 12 is supplemented downstream in the product flow by an additional or secondary drivable belt system 11a, 12a running at the same speed. This secondary drivable belt system 11a, 12a respectively adjoins a belt system 17, or respectively 22, of the product flow
REFERENCES:
patent: 4373713 (1983-02-01), Loebach
patent: 4461467 (1984-07-01), Herb
patent: 4721294 (1988-01-01), Petersen
patent: 5520378 (1996-05-01), Kepert et al.
patent: 5573231 (1996-11-01), Stab
patent: 5653428 (1997-08-01), Dufour et al.
Jensen Steven
Koenig & Bauer Aktiengesellschaft
Sipos John
LandOfFree
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