DD233112B3

DD233112B3 - DEVICE FOR PRESSING CROSS TO FACE ARROW BOW FOLDS

Info

Publication number: DD233112B3
Application number: DD26542084A
Authority: DD
Inventors: Wolfgang Schulz; Gottfried Dr-Ing Beyer
Original assignee: Inst Grafische Technik Zentral
Priority date: 1984-07-19
Filing date: 1984-07-19
Publication date: 1993-03-11
Also published as: DD233112A1

Description

Preß- und Gegenwalze einlaufende Bogenf alz muß, während die Preßwalze durch den Bogenfalz angehoben wird, zusätzlich zur statischen Kraft die zur Beschleunigung von Preßwalze und Hebelarmen um die Hebel-Drehachse erforderliche Massenkraft aufnehmen. Hingegen wirkt beim Durchlaufen der übrigen Bogenfläche durch den Walzenspalt nur die zur Rückstellug der Preßwalze benötigte statische Kraft. Das Verhältnis von dynamischer zu statischer Kraft ist um so größer, je größer die Fördergeschwindigkeit und je größer das Massenträgheitsmoment im Verhältnis zum statischen Moment von Preßwalze und Hebelarmen um die Hebel-Drehachse sind.Compressor and counter roll incoming sheet metal must, while the press roll is lifted by the bow fold, receive, in addition to the static force, the mass force required to accelerate the press roll and lever arms about the lever axis of rotation. By contrast, when passing through the rest of the sheet surface through the nip, only the static force needed to return the press roll acts. The ratio of dynamic to static force is greater, the greater the conveying speed and the greater the moment of inertia in relation to the static moment of the press roll and lever arms around the lever axis of rotation.

Um die Differenz zwischen derauf den Bogenfalz wirkenden und derauf die restliche Bogenfläche wirkenden Kraft zu vergrößern und auch bei kleinen Fördergeschwindigkeiten wirksam werden zu lassen, werden ferner erfindungsgemäß die verlängerten Hebelarme durch Magnetkraft in ihrer unteren Endposition festgehalten. Die zur Überwindung der Magnethaftung erforderliche Kraft, multipliziert mit dem Verhältnis der Abstände von Magneten und Preßwalzenachse von der Hebel-Drehachse, muß ebenfalls über den Bogenfalz aufgebracht werden. Ist aber, während die restliche Bogenfläche den Walzenspalt durchläuft, die Haftung der Magneten an den Hebelarmen aufgehoben, so wird die Magnetkraft praktisch gleich Null.Furthermore, in order to increase the difference between the force acting on the sheet fold and the force acting on the remaining sheet surface and to be effective even at low conveying speeds, according to the invention the extended lever arms are retained in their lower end position by magnetic force. The force required to overcome the magnetic adhesion, multiplied by the ratio of the distances of magnet and press roll axis from the lever axis of rotation, must also be applied over the arch fold. But if, while the remaining arc surface passes through the nip, the adhesion of the magnets to the lever arms is released, the magnetic force is practically zero.

Der Vorteil der Erfindung besteht darin, daß auch bei unterschiedlichen Falzqualitäten sowie Papierqualitäten in jedem Fall eine ausreichende Preßwirkung auf den Bogenfalz erreicht und dabei ein Ablegen der Farbe von frisch bedruckten Bogenf alzen vermieden wird.The advantage of the invention is that even with different folding qualities and paper grades achieved in each case a sufficient pressing action on the Bogenfalz and thereby depositing the color of freshly printed Bogenf is avoided.

embodiment

Die Erfindung wird nachstehend anhand eines Ausführungsbeispieles näher erläutert Es zeigenThe invention will be explained in more detail below with reference to an exemplary embodiment

Fig. 1: the side view of the device in a sectional view 2: the top view of the device according to FIG. 1 3 shows the view of a lever arm and magnet in the direction of arrow according to FIG. 1.

Ein Falzbogen 1 wird mit seinem Rückenfalz voran kontinuierlich und taktfrei auf einem Förderband 2 in den Walzenspalt zwischen einer angetriebenen und im Gestell 3 gelagerten Gegenwalze 4 und einer in zwei Hebelarmen 5 gelagerten Preßwalze 6 gefördert. Die Drehbewegungen von Preß- und Gegenwalze 6; 4 sind über Zahnräder 7 zwangsläufig gekoppelt, welche eine relativ große Verzahnung aufweisen und gegen Geräuschbildung vorzugsweise aus einem geeigneten Plastmaterial bestehen. Die Weite des Walzenspaltes ist kleiner als die Dicke des Falzbogens 1, so daß der Bogenfalz, wenn er in den Walzenspalt einläuft, die Preßwalze 6 und die um die Hebel-Drehachse 8 schwenkbaren Hebelarme 5 gegen deren Massenträgheitskraft sowie gegen die zum Ablösen der verlängerten Hebelarme 5 von den an den Gestellwänden 3 befestigten Dauermagneten 9 erforderliche Kraft anhebt.A signatures 1 is promoted with its back fold continuously continuously and clock-free on a conveyor belt 2 in the nip between a driven and mounted in the frame 3 counter roller 4 and mounted in two lever arms 5 press roll 6. The rotational movements of pressing and counter-roller 6; 4 are necessarily coupled via gears 7, which have a relatively large toothing and preferably against noise, made of a suitable plastic material. The width of the nip is smaller than the thickness of the signature 1, so that the Bogenfalz when it enters the nip, the press roll 6 and pivotable about the lever rotation axis 8 lever arms 5 against the inertia and against the release of the extended lever arms 5 of the fixed to the frame walls 3 permanent magnet 9 required force lifts.

Beide Hebelarme 5 sind unabhängig voneinander um ihre gemeinsame Drehachse 8 schwenkbar, so daß in Verbindung mit Anschlägen 10a der Magnethalterung 10, welche die Schwenkbewegung der Hebelarme 5 begrenzen, auch schief in den Walzenspalt einlaufende Bogenf alze auf ganzer Länge gepreßt werden.Both lever arms 5 are independently pivotable about their common axis of rotation 8, so that in connection with stops 10 a of the magnet holder 10, which limit the pivotal movement of the lever arms 5, also skewed into the nip Bogenf alze be pressed to the full length.

Gemäß Rg. 3 ist am verlängerten Ende eines jeden Hebelarmes 5 eine Haftplatte 11 vorgesehen, welche gegen eine elastische Zwischenlage 12 durch Zuganker 13 mit leichter Vorspannung am Hebelarm 5 gehalten wird. Während die Verbindung der Haftplatte 11 mit dem Hebelarm 5 in Richtung des Abreißens der Haftplatte 11 vom Dauermagneten 9 unnachgiebig ist, werden, nachdem der Falzbogen 1 auf ganzer Länge den Walzenspalt zwischen Preßwalze 6 und Gegenwalze 4 durchlaufen hat, der Stoß auf den unter Schwerkraft sich rückstellenden Hebelarm 5 beim Wiederanhaften des Magneten 9 elastisch abgefangen und das Geräusch gemindert.According to Rg. 3, an adhesive plate 11 is provided at the extended end of each lever arm 5, which is held against an elastic intermediate layer 12 by tie rods 13 with slight bias on the lever arm 5. While the connection of the adhesive plate 11 with the lever arm 5 in the direction of tearing off the adhesive plate 11 from the permanent magnet 9 is unyielding, after the signatures 1 has run through the nip between the press roll 6 and counter roll 4 on full length, the impact on the under gravity itself resetting lever arm 5 elastically intercepted when re-adhering the magnet 9 and reduced the noise.

Mittels Stellschrauben 14 können die an nicht dargestellten Langlöchern der Gestellwände 3 vertikal verstellbaren Magnethalterungen 10 und damit die Weite des Walzenspaltes zwischen Preßwalze 6 und Gegenwalze 4 eingestellt werden.By means of screws 14 which can not be shown on elongated holes of the frame walls 3 vertically adjustable magnetic holders 10 and thus the width of the nip between press roll 6 and counter roll 4 can be adjusted.

In Betracht gezogene Druckschriften: DE 2640411 DE-Gm 7536871Documents considered: DE 2640411 DE-Gm 7536871

Claims

Apparatus for pressing transversely to the conveying direction facing Bogenfalzen during the conveying movement by means of one or more successively arranged pairs of rollers, one roller fixed to the frame and driven and the other roller in two lever arms, which are pivotable independently of each other near the press roll mounted in them about a common axis of rotation is rotatably mounted and pressed by means of gravity and / or spring force in the direction of the counter roller mounted in the frame, characterized in that the inertial mass acting as lever arms (5) at their extended free ends against permanent or electromagnets (9) and are held in such a position that the gap width between the press roll (6) and counter-roll (4) is smaller than the thickness of the signature (1).

For this 1 page drawings

Field of application of the invention

The invention relates to a device for pressing transversely to the conveying direction facing back folds of signatures during their continuous and clock-free promotion, preferably arranged between the folding unit of a web-fed rotary printing press and a sheet collecting device.

Characteristic of the known technical solutions

To avoid or reduce the resulting technically and technologically limited pressing action of the folding tools Aufspreizens folded sheet and Aufbauschens the Bogenfalze, which is disturbing the subsequent collection of the signatures, there is a known conveyor of flap-shaped pliers, which, led between two chains Dorsal folds hold the bow and press it. The advantage of large pressing duration are the disadvantages of the large construction effort, the need for clock-bound promotion and the difficulty to apply large pressing forces opposite.

It was therefore proposed to provide according to utility model 7136932 or according to DE patent 2640411 several successively arranged pairs of rollers, one of which is mounted on a roller frame, the other is taken in lever arms and is pressed by adjustable strong spring force in the direction of the roller mounted in the frame. In this case, the lever arms are supported against adjustable stops, so that an air gap is formed between the rollers, which corresponds in its width to the thickness of the signatures. It should be achieved so that a pressing force is transmitted only to the Bogenfalz, while the pressure of the rollers on the rest of the sheet surface, since it is less thick than the Bogenfalz, smaller, so that the color freshly printed sheet does not deposit.

Apart from the fact that the nip must be set very accurately and the paper thickness has differences within a run, the Bogenfalz can be compressed when passing through the nip at most on the thickness of the rest of the sheet surface, the pressing effect is small. If, however, the nip adjusted so that the pressing action is sufficient, it is because of the small difference in thickness of fold and sheet surface on the latter a pressure exerted, causing a drop in the color freshly printed sheet. Overall, the known technical solutions are sometimes structurally complex and require a clock-bound promotion, partly the difference between acting on the Bogenfalz and acting on the sheet surface pressing force is too small to effectively press the Bogenfalze on the one hand, on the other hand, the color on fresh to avoid printed bow areas.

Object of the invention

The aim of the invention is to provide a device for pressing transversely to the conveying direction pointing back folds of signatures during their clock-free continuous promotion that works automatically, requires little structural effort and exerts little or no pressure on the bow surfaces.

Explanation of the essence of the invention

The invention has for its object to make the means for pressing the Bogenfalze so that they exert strong pressure on the transverse to the conveying direction Bogenfalze, but only low pressure on the rest of the curved surface with low structural complexity and tact-free, automatic operation.

The essence of the invention is to utilize dynamic and magnetic force effects. According to the invention, a pressing roller mounted in two lever arms is arranged above a counter roller mounted and driven in the frame. Lever arms and press roll are designed so that the moment of inertia around the lever axis of rotation large, the static, caused by gravity or spring moment is small. The one in the gap between