EP1690819A1 - Folding former of a printing machine. - Google Patents

Abstract

A former nose (13) is fixed at bottom end of the former (10) which is pivoted about a pivot point (14) such that the noise is displaceable horizontally. The inclination angle of the former is changed during displacement of the nose. A former spread angle is set as a function of the inclination angle of the former and the number of pages to be folded. The outer edges of the folding section of the product (15) are aligned with the other sections of the product. Independent claims are also included for the following: (1) production method of printed product; and (2) folding method of printed product.

Description

The invention relates to a folding hopper of a printing press according to the preamble of claim 1. Furthermore, the invention relates to a method for producing a printed product with a plurality of books according to the preamble of claim 13.

Folding machines of printing presses serve for the formation of folds on printed substrates, wherein according to the prior art for seam formation a web-shaped substrate is first passed through a so-called folder hopper so as to form a longitudinal fold on the web-shaped and not yet severed substrate. Starting from the former, the web-shaped substrate is transported over several draw rollers in the direction of a cutter blade cylinder and a folding blade cylinder cooperating with the cutting blade cylinder, whereby copies are separated on the cutting blade cylinder of web-shaped printing material, which are moved by means of folding blade in the direction of a jaw cylinder. The severed on the cutter knife cylinder from the web-shaped substrate copy, which is moved by the folding blade in the direction of the jaw cylinder, is passed to form a Querfalzes of the folding blade cylinder to the jaw cylinder. The present invention relates to the former for the formation of Längsfalze on web-like and not yet severed substrate.

DE 39 13 112 C2 discloses a former of a web-fed rotary printing press with two hopper halves. The former has a funnel nose and a center of gravity, wherein for horizontal displacement of the funnel nose to the front and / or to the rear of the former is pivotable by changing the Trichtungsigungswinkels about the center of gravity. From DE 39 13 112 C2 it is also known, depending on the change in the funnel inclination angle, to change the funnel flank angles of both funnel halves. The sum of both funnel flank angles determines the so-called funnel spreading angle of the folder.

In the production of printed products, especially newspapers, with several books usually different thickness books are provided on several formers with corresponding Längsfalzen. Be several different thick books to a printed product, eg. As a newspaper, merges, so the location of an outer edge of each book is determined by the thickness of the same, the outer edges of thicker books are more forward than the outer edges of thinner books. For optical reasons, however, it is desirable to bring the finished product, the outer edges of all books in the same position or position. Only then is an optically ideally folded printed copy available. From the state of the art, no folders have hitherto been known which take this phenomenon into account.

On this basis, the present invention is based on the problem to provide a novel former of a folder of a printing press.

This problem is solved by a former of a folder of a printing press according to claim 1. According to the invention, for aligning the outside edges of books to be folded in the former, the hopper pitch angle and the hopper spread angle are adjustable depending on the page number of the books to be folded.

For the purposes of the present invention, it is proposed to adjust the Trichterneigungswinkel and the funnel spreading angle in dependence on the books to be folded in each folder to align the outer edges of folding in a former, as a function of the deviation of the page number to be folded in the former of a Reference book with a reference page number. This reference page number can also be zero. As a result, a former is proposed for the first time, with which an optically correctly folded printed product, which has books of different thickness, can be produced.

According to an advantageous embodiment of the invention, the funnel flank angles are asymmetrically adjustable by a correction angle to form a fold with a larger front side than the back.

According to a further advantageous embodiment of the invention, the funnel flank angles are symmetrically adjustable by a correction angle to reduce occurring web tension.

The inventive method for producing a printed product with multiple books is defined in claim 13.

Fig. 1:

eine stark schematisierte Darstellung eines erfindungsgemäßen Falztrichters in Seitenansicht; und

Fig. 2:

eine stark schematisierte Darstellung eines erfindungsgemäßen Falztrichters in Vorderansicht.

Preferred embodiments of the invention will become apparent from the dependent claims and the description below. An embodiment of the invention will be described, without being limited thereto, with reference to the drawing. Showing:

Fig. 1:

a highly schematic representation of a former according to the invention in side view; and

Fig. 2:

a highly schematic representation of a former according to the invention in front view.

Hereinafter, the present invention will be described in more detail with reference to FIGS. 1 and 2.

1 and 2 show a highly schematized folding former 10 of two hopper halves 11 and 12, wherein the former 10 has a funnel nose 13 and a pivot point or a pivot axis 14. As can be seen from Fig. 2, a web-shaped substrate 15 is introduced with the width B from above into the former 10 and led out of the same in the region of the funnel nose 13, wherein in the area of the funnel nose 13 led out of the former 10 printing material 15 after the Forming a Längsfalzes in the former 10 of FIG. 1, the width B / 2. The position of the funnel nose 13 relative to the printing material 15 to be folded can be defined by a cone inclination angle β (see FIG. 1) and a funnel spreading angle γ (see FIG. 2). The funnel spreading angle γ corresponds to the sum of the funnel flank angles α ₁₁ and α _{12 of} the two funnel halves 11, 12 with respect to a horizontal 16.

$${\beta }_{\mathrm{neu}}=\beta +\arctan \left(\frac{K}{k_2}\right)$$

$${\gamma }_{\mathrm{neu}}=2\ast \arctan \left(\cos \left({\beta }_{\mathrm{neu}}\right)\right)$$

wobei S die Abweichung der realen Seitenzahl des im Falztrichter zu falzenden Buchs von der Referenzseitenzahl des Referenzbuchs ist, wobei k₁ eine von der Lagedicke bzw. Bedruckstoffbahndicke des zu falzenden Buchs abhängige Konstante ist, wobei k₂ eine von dem Abstand zwischen Trichternase und Schwenkpunkt bzw. Schwenkachse abhängige Konstante ist, und wobei β_neu und γ_neu die von der realen Seitenzahl des im Falztrichter zu falzenden Buchs abhängigen Winkel, nämlich Trichterneigungswinkel und Trichterspreizungswinkel, des Falztrichters sind.Below is to be assumed that the former β 10 of FIG. 1 and 2 with respect to the hopper inclination angle, and γ of the funnel angle of spread, and thus the former flank angle α _11, α ₁₂ is set to a to falzendes reference number, a reference number of pages. This reference page number can also be zero. For the purposes of the present invention, the Trichterneigungswinkel β and the funnel spreading angle γ are now dependent on the real page number of the book to be folded adjustable to align the outer edges of foldable in the former, real books. Depending on a deviation of the real page number of the book to be folded in the former from the reference page number of the reference book, the hopper pitch angle β and the hopper spread angle γ are adjustable using the following equations: $$K=\mathrm{\Delta }S*\frac{k_1}{\sin \left(\beta \right)}$$

$${\beta }_{\mathrm{New}}=\beta +\arctan \left(\frac{K}{k_2}\right)$$

$${\gamma }_{\mathrm{New}}=2*\arctan \left(\cos \left({\beta }_{\mathrm{New}}\right)\right)$$

where S is the deviation of the real page number of the book to be folded in the former from the reference page number of the reference book, where k _{1 is} a constant dependent on the layer thickness or printing material web thickness of the book to be folded, k _{2 being} a distance from the distance between funnel nose and pivot point Pivot axis dependent constant, and where β _new and γ _{new are} the angles depending on the real page number of the book to be folded in the former, namely, the cone pitch angle and the hopper spreading angle of the former.

Taking advantage of the above relationships, it is possible to bring the position of the outer edges of summarized in a printed product, different thickness books in accordance, so that an optically correctly folded printed product, eg. As a newspaper, is present. The values β _new and γ _new are the hopper pitch calculated on the basis of the difference page number S between the book to be folded and the reference book and the hopper spread angle. Has the real book to be folded compared to the reference book z. B. on a higher page number, so the funnel nose 13 is moved by the amount K shown in FIG. 1, whereby the funnel inclination angle β _{newly increased} relative to the valid for the reference book funnel angle β, the funnel spreading angle γ _new is reduced. Has, however, the real book to be folded against the reference book on a smaller number of pages, then the hopper slope decreased β _novel over the regulations to which reference book hopper inclination angle β, the funnel spreading angle γ increases.

$${\alpha }_{11,\mathrm{neu}}={\alpha }_{12,\mathrm{neu}}=\frac{{\gamma }_{\mathrm{neu}}}{2}$$

Assuming that the funnel flank angles α ₁₁ and α _{12 of} the two funnel halves 11, 12 are equal, the funnel flank angles can be calculated using the following two equations: $${\gamma }_{\mathrm{New}}={\alpha }_{11.\mathrm{New}}+{\alpha }_{12.\mathrm{New}}$$

$${\alpha }_{11.\mathrm{New}}={\mathrm{<figure-callout\; id="12"\; label="\alpha "\; filenames="imgf0001.png"\; state="\{\{state\}\}">\alpha </figure-callout>}}_{12.\mathrm{New}}=\frac{{\gamma }_{\mathrm{New}}}{2}$$

$${\alpha }_{12,\mathrm{neu}}=\frac{{\gamma }_{\mathrm{neu}}}{2}+{\delta }_1$$

According to an advantageous embodiment of the invention, the funnel halves 11, 12 are asymmetrically adjustable to form a fold with a larger front than the back so as not to cover correctly folded layers. For this purpose, the funnel flank angles α ₁₁ and α _{12 of} the two funnel halves 11, 12 are adjusted asymmetrically by a correction angle δ ₁ taking into account the following two equations: $${\alpha }_{11.\mathrm{New}}=\frac{{\gamma }_{\mathrm{New}}}{2}-{\delta }_1$$

$${\mathrm{<figure-callout\; id="12"\; label="\alpha "\; filenames="imgf0001.png"\; state="\{\{state\}\}">\alpha </figure-callout>}}_{12.\mathrm{New}}=\frac{{\gamma }_{\mathrm{New}}}{2}+{\delta }_1$$

Such an asymmetric adjustment of the funnel flank angles α ₁₁ and α ₁₂ for providing a larger front side than the back on a folded book is shown in FIG. 2 in dashed lines. In the dashed lines, the funnel flank angle α _{11 is} reduced and the funnel flank angle α ₁₂ is increased.

The correction angle δ ₁ for the asymmetrical or asymmetrical adjustment of the funnel flank angles α ₁₁ and α ₁₂ is at most 2 ° and is preferably in a range between 0.1 ° and 1 °.

In the inventive adjustment of Trichterneigungswinkel and funnel spreading angle and thus the funnel flank angle undesirable web tension can be adjusted, which adversely affect the quality of folding by forming unwanted wrinkles. To reduce the web tension is proposed according to a further advantageous embodiment of the present invention, in the case of adverse web tension, the funnel flank angle α ₁₁ , α ₁₂ to symmetrically adjust a correction value δ ₂ using the following equation: $${\alpha }_{11.\mathrm{New}}={\mathrm{<figure-callout\; id="12"\; label="\alpha "\; filenames="imgf0001.png"\; state="\{\{state\}\}">\alpha </figure-callout>}}_{12.\mathrm{New}}=\frac{{\gamma }_{\mathrm{New}}}{2}+{\mathrm{<figure-callout\; id="2"\; label="\delta "\; filenames="imgf0001.png"\; state="\{\{state\}\}">\delta </figure-callout>}}_2$$

The correction angle δ ₂ for the funnel flank angles α ₁₁ and α ₁₂ for reducing web tension is preferably in a range between -1 ° and + 1 °, preferably in a range between -0.5 ° and + 0.5 °. To reduce the web stresses, therefore, the funnel flank angles α ₁₁ and α _{12 are} increased or decreased, namely, until folds caused by web tension disappear.

Accordingly, with the adjustable according to the invention formers can be printed products, namely newspapers, ideal fold with different thick books. Each book is provided on a separate former with a longitudinal fold, wherein each of the formers can be adjusted or adjusted as described above, depending on the number of pages to be folded on the former.

LIST OF REFERENCE NUMBERS

10

formers

11

funnel half

12

funnel half

13

former nose

14

pivot point

15

printing material

16

horizontal

Claims (14)

With a hopper nose (13) and with a pivot point or a pivot axis (14), wherein for horizontal displacement of the hopper nose (13) of the former with changing a Trichteanigungswinkels (β) to the Pivoting point or the pivot axis (14) is pivotable, and wherein a funnel spreading angle (γ) in relation to the funnel inclination angle (β) is variable, characterized in that for aligning the outer edges of foldable in books to be folded books the funnel inclination angle (β) and the funnel spreading angle (γ) are adjustable depending on the page number of the books. Forming hopper according to claim 1, characterized in that the hopper pitch angle (β) and the hopper spread angle (γ) are set using the following equations: $$K=\mathrm{\Delta }S*\frac{k_1}{\sin \left(\beta \right)};$$

$${ß}_{\mathrm{New}}=\beta +\arctan \left(\frac{K}{k_2}\right);$$

$${\gamma }_{\mathrm{New}}=2*\arctan \left(\cos \left({\beta }_{\mathrm{New}}\right)\right);$$

where S is the deviation of the page number of the book to be folded in the former from a reference page number of a reference book, where k _{1 is} a constant dependent on the layer thickness of the book to be folded, and k ₂ is dependent on the distance between the hop nose and the pivot point Constant is. Forming hopper according to claim 2, characterized in that hopper halves (10, 11) relative to a horizontal (16) about a funnel flank angle (α ₁₁ , α ₁₂ ) are inclined, where: $${\gamma }_{\mathrm{New}}={\alpha }_{11.\mathrm{New}}+{\alpha }_{12.\mathrm{New}},$$

Forming former according to claim 3, characterized in that for the funnel flank angles (α ₁₁ , α ₁₂ ): $${\alpha }_{11.\mathrm{New}}={\alpha }_{12.\mathrm{New}}=\frac{{\gamma }_{\mathrm{New}}}{2},$$

Forming hopper according to claim 3, characterized in that for forming a fold having a larger front side than the rear side, the funnel flank angles (α ₁₁ , α ₁₂ ) are asymmetrically adjustable by a correction angle δ ₁ . Forming hopper according to claim 5, characterized in that in the asymmetric adjustment of the funnel flank angle (α ₁₁ , α ₁₂ ): $${\alpha }_{11.\mathrm{New}}=\frac{{\gamma }_{\mathrm{New}}}{2}-{\delta }_1;$$

$${\alpha }_{12.\mathrm{New}}=\frac{{\gamma }_{\mathrm{New}}}{2}+{\delta }_1,$$

Forming hopper according to claim 5 or 6, characterized in that the correction angle δ _{1 is} a maximum of 2 °. Forming hopper according to claim 7, characterized in that the correction angle δ _{1 is} a maximum of 1 °. Forming hopper according to one or more of claims 3 to 7, characterized in that for reducing occurring web tension, the funnel flank angles (α ₁₁ , α ₁₂ ) are symmetrically adjustable by a correction angle δ ₂ . Forming hopper according to claim 9, characterized in that in the symmetrical adjustment of the funnel flank angle (α ₁₁ , α ₁₂ ): $${\alpha }_{11.\mathrm{New}}={\alpha }_{12.\mathrm{New}}=\frac{{\gamma }_{\mathrm{New}}}{2}+{\delta }_2,$$

Forming hopper according to claim 9 or 10, characterized in that the correction angle δ _{2 is} in a range between -1 ° and + 1 °. Forming hopper according to claim 11, characterized in that the correction angle δ _{2 is} in a range between -0.5 ° and + 0.5 °. A method for producing a printed product, in particular a newspaper, with several books, each book being provided with a longitudinal fold in a different former, characterized in that for aligning the outer edges of books to be folded in the formers the former angle (β) and the hopper spread angle (γ) of the former are adjusted depending on the page number of the respective books to be folded. A method according to claim 13, characterized in that the formers are adjustable in the sense of claims 2 to 12.

Images