DE3221525A1 - VARIABLE POCKET FOLDING MACHINE FOR FOUR BREAK FOLD - Google Patents

Description

Variable pocket folding unit for four-fold fold

The invention relates to a variable pocket folding unit for front * assigned four-fold fold for use in folding machines, in which the sheets in the 4th pocket folder optionally with internal » tional or English four-fold fold.

In folding machines of known design of the third and fourth folding breaks are provided to the formation in most cases Taschenfalzwerke _(which duroh adjusting the Bogenablenker "that is, by free selection of the next used FaIz- pockets is possible to produce fold breaks in any direction. Such a folding unit structure is for example in of OE-AS 1 611 395 for the formation of the 2nd, 3rd and 4th fold breaks intended. However, this optional use of folding pockets pointing upwards or downwards is not a double sheet fold machines limited, but common. The optional However, using the folding pockets with the folding roller arrangement selected in the example mentioned is still not sufficient from «to realize the English and the international four-fractions when processing thick paper in practice. In addition let another folder with one in relation to the sheet travel in an obtuse angle pointing downwards with a folding pocket with all the additional effort required for the purchase of “maintenance,“ storage and longer set-up times resulting from moving the folding units ”.

With the folding unit structure selected in OE-AS 1 611 395 A high-quality processing without additional perforation of the folded sheets, especially in the 4, folding unit only with thin ones Paper possible. When using the lower folding pocket, pinch folds occur even with paper over 70 g / m, as the fold bent under one after entering the feed rollers must be inserted into the folding pocket at an acute angle. When processing paper from 90 g / m, the use of «ines Folding unit as described in OE-AS 1 611 395 at all

only possible with concessions regarding the fold quality, because when the folded sheets run out of the folding unit, even when using the upper folding pocket, pinch folds are already present appear.

It is the aim of the invention to enable the production of the English and international four-fraction with a minimum of effort to create, Realizing maintenance and storage for the 4th folding unit as well as those resulting from the relocation of folding units avoid long set-up times.

The invention is based on the object of building a folding unit head for English and international four-fold to be changed in such a way that the folding sheets do not enter the folding pockets at an acute angle, regardless of their scheme Arrangement are fed.

According to the invention, the object is achieved in that two pairs of rollers and their arrangement are provided for feeding the folding sheets to the folding pocket so that the fold formation can optionally take place depending on the requirements with regard to the desired folding scheme in the direction from top to bottom or vice versa. The folding pocket is inserted accordingly in position I or II and the sheet deflectors are swiveled in or out. To form the fold, one roller of the pair of rollers works together with a folding roller to feed the folded sheets. A particularly advantageous construction of the folding unit head is achieved according to the invention in that the two roller pairs for feeding the folded sheets are formed from a total of three rollers, one of which is part of both roller pairs, the rotation of which can be changed depending on the sheet path to be selected. According to the invention, a pivotably arranged feed table is provided for optionally feeding the folded sheets to one of the two roller pairs.

De after position of the feed table, the folded sheets are fed to one of the two existing roller pairs, transported to the stop of the folding pocket, folded and folded by the folding roller engaged with a roller pair either in the direction from top to bottom or in the direction from bottom to top after being deflected by the swiveled-in sheet deflector, fed to a delivery by transport rollers «When feeding the Sheets to the upper pair of rollers in the 4th folder are designed as an English four-fold, when fed to the lower roller pair as an international four-fold. In both

In cases, the folding pocket forms one with the sheet travel plane

obtuse angle oC »so that a forced guidance of the folded sheet at an acute angle is avoided. The variable folding mechanism according to the invention is therefore without for all types of paper Restrictions applicable.

The drawings show an exemplary embodiment of the subject matter of the invention in a schematic representation for production of the various four-fold types in the 4th buckle folder.

Fig. It sheet travel in the production of

English four-fold fold

Fig. 2j sheet travel in the production of

international four-fold

In Fig. 1, the Felzbogen 1 are the pair of rollers 2 on the pivotally arranged feed table 5 and transported up to the stop of the folding pocket 6 in position I. the Fold formation takes place from top to bottom between the folding roller 4 and a roller of the in engagement therewith Roller pair 2. The swiveled-in sheet deflector 7 directs the folded sheets in the direction of the transport rollers 9 for the delivery of the Folding machine. In this position the feeder iso 5 and the Falztasohe 6 in the fourth folder the delivery takes place as an English four-fold »

In Fig. 2, the folded sheets 1 are the pair of rollers 3 on the pivotally arranged feed table 5 and transported to the stop of the folding pocket 6 in position II. The fold formation takes place from bottom to top between the folding roller 4 and a roller in engagement therewith of the pair of rollers 3 ″ The swiveled-in sheet deflector 8 steers the folded sheets in the direction of the transport rollers 10 for the delivery of the folding machine. In this position of the feed table 5 and the repositioned folding pocket 6 in position II in the fourth Folder, the delivery takes place as an international four-fold.

The angle ° C «influencing the fold quality i.e. the angle under which the folded sheet is fed to the folding pocket is ^ 90 ° in both applications. So that is Eliminates the cause of the occurrence of pinch lines and a universally applicable, variable folding unit is available.

List of the references used

1 folding sheet

2 pairs of rollers for feeding the folded sheets

3 iValzenpaar for feeding the folded sheets

4 folding roller

5 infeed table (swiveling)

6 folding roller

7 bow deflectors

8 bow deflectors

9 Transport roller pair Transport roller pair

Claims (3)

Claims 1. Variable tray folder for four-fold fold with adjustable Sheet deflector and exchangeable folding pocket marked # in that the folding unit head consists of two pairs of rollers (2; 3) for feeding the folded sheets (1) to the folding pocket (6) and from with one of the two rollers of the roller pairs (2; 3) engaged folding rollers (4), the folding sheets (1) optionally one of the two Roller pairs (2; 3) are fed. 2. Variable pocket folding unit according to claim 1 characterized in that the two pairs of rollers (2; 3) for feeding the folded sheets from a total of three rollers, the direction of rotation is reversible, are formed, one of which is part of both roller pairs and with the folding roller (4) in engagement stands. 3. Variable Tasohenfalzwerk according to claim 1 to 2, characterized in that for the optional feeding of the folded sheets (1) to one of the two pairs of rollers (2; 3) for feeding a feed table (5) is pivotably arranged. Here is a page of drawings