DE2247517A1 - CROSS OR LONGITUDINAL FOLDING DEVICE IN ROTARY FOLDERS - Google Patents

Description

received

VEB Polygraph Leipzig LdIv - ■! -_,; · μ>. 11. 1 "", ^r 1

Combine for polygraphic - ¹ J .-- ?. ⁰ : -;. ': ./ Jc _,

Machines and equipment * V1 -. r? ^ '<'"el'·"*' ¹ I

Cross or longitudinal folding device in rotary folders

The invention "relates to a transverse or longitudinal folding device in rotary folders, as they are used by the various web processing companies Rotary printing machines are arranged »The invention particularly relates to these folding units, which are usually equipped with a longitudinal fold former and one or more transverse fold cylinders, assigned Devices, for example for a third cruciform fracture or for a so-called double parallel fracture *, Since a high level of folding accuracy is required in these operations, knife folding devices are predominantly used in these cases a. In these "folding devices, the folding knife either slides in straight guides or it is on one Articulated rocker arm. The drive for the folding blade movement is problematic in these devices, in particular in larger formats

The relatively large stroke of the folding knife and that of modern ones High-speed machines with a high number of strokes can be controlled by a curve the drive movement as it "would be ideal" and as it is 7 / urde, for example, from the German patent specification 469 435, no longer applies. ',

Devices have also become known ₉ in which the knife folder, as described for example in the BRD Offenlegungssehrift 1 611 344, is driven with the aid of pneumatically actuated cylinders.

The drive by electromagnets has also already been implemented by the German patent 847 154 known. The last two drives have in common that with Firstly, the number of strokes required for modern machines cannot be achieved.

309824/0292 2

BATH ORIGINAL

received mJ ^6ff $ fö

mesßers on the products as a result of the oii more impulsive Movement is detrimental.

Relatively good folding performance was achieved when using Straight thrust crank drives, which are predominantly used recently, achieved. However, all crank mechanisms are peculiar to the fact that the speed of the sliding elements is true a long time before they approach the stroke ends, decreases sharply. After the The folding knife only has a relatively short, but very hard impulse, almost maintains the given speed, but then loses any guidance to the folding knife, which is increasingly slowing down in terms of speed, and slides open this way is relatively informal over a large part of the Until the folding scales take it. Since the products are already in different stations via folding funnels, Flap cylinders etc. were folded and therefore have an open and a closed side, there are different Differences in stiffness and friction on both sides of the products that are in which the products no longer rest on the folding knife, lead to the fact that the products depending on the mass and folding speed arrive at the folding rollers at an angle · This often results in folding differences and stoppers · With larger Inclination capture the grip points of the folding rollers fresh print,

The invention aims, while avoiding the mentioned tile parts, an exploiting the advantages of the prior art, To create economically viable device in which consciously known from gear theory, but not yet applied in this context, gear means are used will·

The object of the invention is to determine the sequence of movements of the folding blades in transverse or longitudinal folding devices

3Ü982A / 0292

BADOFHGiNAl

received m.JkiJL · ^

improve so ^ u that the folding knife hits the product at low speed, together with the Product is accelerated and the product is influenced until it is gripped by the folding rollers.

According to the invention this is achieved in that the previously existing straight club crank in a known manner Antiparallel cranks are arranged in front of Bind in such a way that their output crank is at the same time the drive crank of the straight thrust crank Instead of the anti-parallel cranks, according to a further feature of the invention, there are also known elliptical gears usable

The invention achieves the particular advantage that the continuous design of the folding knife movement sequence the products are guided precisely until they are transferred to the folding rollers. This can improve the quality the number of folded products can be increased significantly. The invention can be easily applied to the drives the folding knives of sheet folding machines, such as those used in bookbinding shops are used.

An embodiment of the invention is in the accompanying Drawing shown.

Show it:

Figo 1: a side view of a transverse folding knife drive according to the invention,

Fig. 2: a diagram in which the visual characteristics of the drive with and without anti-parallel cranks in the area of the forward movement of the folding knife are juxtaposed

A crank 2 can be moved by the drive shaft 1 and, together with the coupling 3, the crank h and the fixed actuator 5, forms a counter-rotating anti-parallel crank mechanism. According to the invention, the crank 4 is simultaneous

h 3.0 ^c -8 2 4/0 2 9 -2-

BATH ORIGINAL

received nm U. ι. tan *

the drive crank of the also from the coupling 6, the slide rod 7 and the frame or slide rod guide 8 formed straight thrust crank mechanism.

At the tip of the slide bar 7, the folding knife 9 is arranged, which was previously used in the rotary folder of cut, longitudinally and transversely folded from the printed web, possibly also collected products 10 over the baffles in the gap between the folding rollers 12; 13 leads to delivery point 14.

Depending on the required stroke size of the folding knife 9, the coupling 6 can either be articulated at any hinge point 15 or, at maximum advance of the folding knife 9, at the existing joint 16, which connects the coupling 3 and the crank 4 and which can gelonlcpunlct 15 but also be slidable on the crank h.

As is known, an elliptical wheel 17 ″ can also be arranged on the drive shaft 1, without changing the movements generated by the counter-rotating anti-parallel cranks 2 bin, which cooperates with an elliptical rail 19 of the same size that can be rotated on an axis liier at dsw distance between the fixed G-eleiikpunkte of the frame member 5 of the anti-parallel cranks 2 to 5 «The coupling would be dv..mi articulated on the large elliptical axis of the elliptical wheel 19.

In the case of a folding blade drive with only one straight-line crank, as has been mostly formed up to now by the crank 4, the coupling 6, the slide rod 7 and the slide rod guide 8, the folding blade 9, as shown in FIG. 2 on the basis of the line 20 illustrates that during contact with the product 10, only an insignificant acceleration. The speed then reached is only maintained over a short distance and the speed immediately increases sharply after the end of the stroke, so that the products 10 are no longer guided safely and relatively

30 982A / 0292 BAD OFWQtNAtO CiA8

received nm U. f.1 * 13 ^$

casually in the direction of the gap between the FaIzwalzen 12, 13 zn slide · Relatively expensive measures, ^{T <oe} r, "B" the retention of the products by seconded over the baffles 11 brake rollers, ball Reiter o ₀ the like., through which the product should be braked / grounded, did not lead to any success. Since the products 10, as already indicated, have mostly already been folded in previously arranged stations via folding formers and IC flap cylinders and consequently have an open and a closed side, the inaccuracies already mentioned in the illustration of the prior art result If it is proposed that the straight thrust crank is combined with counter-rotating anti-parallel cranks, a V / eg-G speed ratio results during the working phase of the folding knife 9, as is shown by the dashed line 21 in FIG. The sequence of movements is similar to that of the exclusive use of the G-eradschubkrankel, but the folding knife 9 touches the product 10 at a relatively low initial speed and guides it with gradual acceleration until it is relatively far below the guide plates 11, to only shortly before the transfer point ' 14, d. h · to be braked before bottom dead center 14 · A skewing of the products 10 is then no longer possible, since it has already been picked up by the folding rollers 12, 13. 2 with s- ^ designated route, between the touchdown point A- reached at almost maximum speed, i.e. after a short time, and the end point E ^ could be used to guide the products 10, when using the drive according to the invention, the much longer distance can s _? are used that lie between the touchdown point Ap reached at a relatively low speed and the one lying relatively shortly before the reversal

309824/0292 ÖAD ORIÖJNÄL ^

received nm U.1.1 $? & _: ._ *

End point E «lies, that is, at the same angular velocity the respective drive crank and cheaper in terms of time Utilization of the work cycle results in a substantial and positive quality of the folded products according to the invention influencing speed characteristics of the falja knife and thus of the entire rotary folder.

0-9 824/0292

Claims (1)

received JALi $ lL P at ent to check: ΓlJ Cross or longitudinal folding device in botation folders, with one the products cyclically between folding rollers sliding folding knife driven by means of a straight thrust crank, characterized in that the straight thrust crank (4; 6 $ 7 $ 8) counter-rotating in a manner known per se Antiparallel cranks (2j | 3; 4? 5) arranged upstream that its output crank (4) is at the same time the drive crank (4) of the straight thrust crank 2 · Cross or longitudinal folding device in Rotatidnsfalzern Claim 1, characterized in that instead of the anti-parallel cranks (2 to 5), elliptical wheels (17 $ 19) can be used. 309824/0292 BAD ORlOfNAt Blank page