Sheet feeding or delivering – Feeding – By means to convey sheet
Patent
1997-03-25
1998-03-31
Milef, Boris
Sheet feeding or delivering
Feeding
By means to convey sheet
271277, 271176, 1984598, 198571, 198576, 198577, B65H 702
Patent
active
057329443
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a process and device for the correctly positioned transfer of transversely folded signatures in folding apparatus for rotary printing presses.
DESCRIPTION OF THE PRIOR ART
A belt segment for conveying and for slowing down folded products between two successive stations of a folding apparatus is known from DE 30 49 595 A1. This device consists of at least two successive sections driven at stepped speeds in respect to each other, and each respectively having an upper and a lower belt set with several belts respectively disposed parallel with each other. A delay segment of this type can be disposed between a folding jaw cylinder and a gripper cylinder.
After a paper web train has been transversely cut into individual signatures, it is generally known to speed up the signatures by means of a belt guidance system in such a way that they can be gripped, for example by the gripper systems of, for example, a collecting cylinder adjustable to various formats. This applies in particular in connection with collecting cylinders adjustable to formats of signatures with a minimum format length.
A high silicon proportion of the surface of the paper and therefore a smooth surface of the folded product can lead to unsatisfactory acceleration or deceleration during speed-up of folded or unfolded signatures, hereinafter always referred to as signatures, as well as during slow-down of signatures. In case of an unsatisfactory acceleration of the signature, it is not sufficiently gripped by the gripper system, so that the signature can become lost. In case of an unsatisfactory deceleration, the signature penetrates so deeply into the gripper system because of its forces of inertia that no release from the gripper system takes place. Both mentioned disadvantages can result in undesired plugging of the folding apparatus. The reverse case can also occur wherein because of a high ink portion of the signatures and therefore their rough surface, either too great acceleration or too great deceleration takes place. These effects are also disadvantageous in the same way and result in plugging. The mentioned effects are the more increased the bulkier the signature, for example in case of deceleration of a signature from a multiply collected production.
A device for preventing plugging of the folding apparatus on printing presses is known from DE-PS 12 30 811, wherein a cutter for cutting off the running paper web is activated by the triggering of a contact in case of piling up or lack of pieces, and wherein the press is stopped. A photoelectric cell is provided between the folding jaw cylinder and the paddle wheel and a pulse generator is provided on the folding jaw cylinder, which is controlled as a function of the press speed, wherein both are connected with a comparison and control device which triggers the cutting of the paper web and switching off the press.
The disadvantage of this device is that the press is switched of in case of inexact positioning of folded signatures.
SUMMARY OF THE INVENTION
It is the object of the invention to provide a process and a device for the correctly positioned transfer of folded signatures which undergo a speed change between two successive stations of a folding apparatus, which is independent of a defined surface property or a defined mass of the folded signatures.
In accordance with the invention the object is attained by conveying the folded signatures from a first folding jaw cylinder to the following folding jaw cylinder by means of a belt guidance system. The actual angular position of a gripper system of a gripper cylinder intended for accepting a preselected signature in respect to a set angular position of the gripper system at a time is determined at this same time. A leading transverse fold edge of one preselected signature out of the regular succession of folded signatures has its position determined. The detected instantaneous angular position of the gripper system is compared with the set angular position. An electrical difference
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Koenig & Bauer--Albert Aktiengesellschaft
Milef Boris
LandOfFree
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